JP2005092028A - Display drive device, display device, and drive control method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display driving device capable of causing each light emitting element to emit light with an appropriate luminance gradation according to display data regardless of variations in light emission characteristics of each display pixel due to changes in external environment or changes with time. Thus, a display device that can display image information satisfactorily and a drive control method thereof are provided.
A display device 100A includes a display panel 110A in which a plurality of display pixels including organic EL elements OEL are arranged in a matrix, a gate driver 120 that sequentially applies a scanning signal Vscan to a scanning line SL, and a data line Data driver 130 that supplies gradation signal voltage Vdata corresponding to display data to DL, and a specific amount (light emission luminance) related to the light emission characteristics of organic EL element OEL of each display pixel, and correction for correcting display data A control circuit 140A.
[Selection] Figure 1

Description

  The present invention relates to a display drive device, a display device, and a drive control method thereof, and in particular, current control type (or current drive type) light emission that emits light at a predetermined luminance gradation by supplying a current according to display data. The present invention relates to a display drive device applicable to a display panel (pixel array) in which a plurality of elements are arranged, a display device including the display drive device, and a drive control method thereof.

  In recent years, organic electroluminescence elements (hereinafter abbreviated as “organic EL elements”) are being used as next-generation display devices (displays) following liquid crystal display devices (LCDs) that are widely used as monitors and displays for personal computers and video equipment. And an inorganic electroluminescent element (hereinafter abbreviated as “inorganic EL element”) or a self-luminous optical element (light emitting element) such as a light emitting diode (LED) is provided in a two-dimensional array. Research and development for full-scale practical application of light emitting element type displays has been actively conducted.

  In particular, a light-emitting element type display using an active matrix driving method has a faster display response speed, no viewing angle dependency, higher luminance and higher contrast, and higher display image quality than liquid crystal display devices. In addition to being able to achieve finer and lower power consumption, it does not require a backlight unlike a liquid crystal display device, and thus has an extremely advantageous feature that it can be made thinner and lighter.

  In such a light emitting element type display, various drive control mechanisms and control methods for controlling the operation (light emission state) of the light emitting element have been proposed. For example, as described in Patent Document 1 and the like, each display pixel constituting the display panel includes a plurality of switching elements for driving and controlling the light emitting state of the light emitting element in addition to the light emitting element. A configuration including a drive circuit (hereinafter referred to as a “light emission drive circuit” for convenience and equivalent to a “pixel drive circuit” described later) is known.

FIG. 11 is an equivalent circuit diagram illustrating a configuration example of each display pixel of a light emitting element type display including an organic EL element in the related art.
As shown in FIG. 11, the display pixel described in Patent Document 1 includes a gate terminal near each intersection of a plurality of scanning lines SL and data lines DL arranged in a matrix on a display panel (not shown). Is connected to the scanning line SL, the thin film transistor (TFT) Tr51 whose source terminal and drain terminal are connected to the data line DL and the contact N51, the gate terminal is connected to the contact N51, and the source terminal (S) is connected to the ground potential Vgnd. A light emission drive circuit DCP including a thin film transistor Tr52, and an anode terminal connected to a drain terminal (D) of the thin film transistor Tr52 provided in the light emission drive circuit DCP, and a cathode terminal from a negative voltage lower than the ground potential Vgnd The organic EL element OEL is connected to the constant power supply voltage Vss.
In FIG. 11, Cp is a parasitic capacitance (retention capacitance) formed between the gate and source of the thin film transistor Tr52. The thin film transistor Tr51 is formed of an n-channel field effect transistor, and the thin film transistor Tr52 is formed of a p-channel field effect transistor.

In the light emission driving circuit DCP having such a configuration, as shown below, the two field effect transistors (switching means) composed of the thin film transistors Tr51 and Tr52 are turned on and off at a predetermined timing. The organic EL element OEL is controlled to emit light.
That is, in the light emission drive circuit DCP, when the high-level scanning signal Vsel is applied to the scanning line SL to set the display pixel to the selected state, the thin film transistor Tr51 is turned on. At this time, display data (image signal) is applied to the data line DL. ) Is applied to the gate terminal of the thin film transistor Tr52 through the thin film transistor Tr51. As a result, the thin film transistor Tr52 is turned on in a conductive state corresponding to the gradation signal voltage Vpix, and a predetermined light emission drive current flows from the ground potential Vgnd through the thin film transistor Tr52 in the direction of the constant power supply voltage Vss. Emits light with a luminance gradation corresponding to the display data (gradation signal voltage Vpix).

Next, when the low-level scanning signal Vsel is applied to the scanning line SL to set the display pixel to the non-selected state, the thin film transistor Tr51 is turned off, thereby electrically disconnecting the data line DL and the light emission driving circuit DCP. The As a result, the voltage applied to the gate terminal of the thin film transistor Tr52 is held by the parasitic capacitance Cp, and the thin film transistor Tr52 is maintained in the on state. The ground potential Vgnd is applied to the organic EL element OEL via the thin film transistor Tr52. The state in which the light emission drive current flows is maintained, and the light emission operation is continued. This light emission operation is controlled so as to be continued, for example, for one frame period until the gradation signal voltage Vpix corresponding to the next display data is written to each display pixel.
Such a drive control method adjusts the voltage applied to each display pixel (the gradation signal voltage Vpix applied to the thin film transistor Tr52) to control the current value of the light emission drive current that flows through the organic EL element OEL. Since the light emission operation is performed at a predetermined luminance gradation, it is called a voltage drive method or a voltage application method.

JP 2002-156923 A (page 4, FIG. 2)

However, a display device provided with a light emission drive circuit that employs a voltage application type drive control method as described above in a display pixel has the following problems.
That is, the light emission drive circuit DCP as shown in FIG. 11 has a configuration in which the current value of the light emission drive current flowing through the organic EL element OEL is controlled according to the voltage applied to each display pixel. Therefore, the element characteristics (channel resistance and the like) of the thin film transistors Tr51 and Tr52 constituting the light emission drive circuit DCP and the element characteristics (resistance and the like) of the organic EL element OEL depend on the external environment such as the ambient temperature and the usage time. When the change (deterioration) occurs, the current value of the light emission drive current supplied to the organic EL element OEL is affected, so that desired light emission characteristics (light emission operation at a predetermined luminance gradation) can be stably performed over a long period of time. It has a problem that it becomes difficult to realize.

In addition, if each display pixel constituting the display panel is miniaturized in order to increase the display image quality, variation in element characteristics of the thin film transistors Tr51 and Tr52 constituting the light emission driving circuit becomes large. There is a problem that the control cannot be performed, and the display characteristics of each display pixel vary, resulting in deterioration of image quality.
Therefore, in view of the various problems described above, the present invention emits light with an appropriate luminance gradation according to display data regardless of deterioration or variation in the light emission characteristics of each display pixel due to changes in the external environment or changes over time. It is an object of the present invention to provide a display drive device that can be operated, and to provide a display device that can display image information satisfactorily and a drive control method thereof.

  According to the first aspect of the present invention, a plurality of display pixels that are two-dimensionally arranged on the display panel are selected for each row, and a signal voltage corresponding to the display signal is applied, so that the display pixel corresponds to the display signal. In the display driving device that performs light emission operation at a brightness gradation, the plurality of displays provided at least for the plurality of display pixels for each row or column of the display panel and when a specific signal voltage is applied. Specific amount detection means for detecting a specific amount related to the light emission characteristics of each pixel; at least storage means for holding gradation data based on the detected specific amount; and gradation data held in the storage means; The relationship between the display signal and the specific amount is the initial value of the display pixel based on the comparison result with the gradation data based on the initial value of the specific amount corresponding to the specific signal voltage in the display pixel. As close relationship in the state, the display driving apparatus characterized by comprising a correction control circuit and a signal correction means for generating a correction signal for correcting the voltage value of the signal voltage applied to the display pixels.

According to a second aspect of the present invention, in the display driving device according to the first aspect, the storage unit further holds gradation data based on an initial value of the specific amount in the display pixel.
According to a third aspect of the present invention, in the display driving apparatus according to the first aspect, the specific amount is detected by the specific amount detecting means when the power to the display panel is turned on and after the power to the display panel is turned on. It is performed at least at any timing after elapse of a predetermined time.

According to a fourth aspect of the present invention, in the display driving device according to the first aspect, the specific amount detection unit is configured to obtain a light emission luminance in the display pixel when the specific signal voltage is applied to the display pixel. A light receiving element to be measured is provided.
According to a fifth aspect of the present invention, in the display driving device according to the fourth aspect, the display signal is composed of digital data, and the specific amount detecting means digitally outputs the signal level of the specific amount output from the light receiving element. It is characterized by comprising conversion means for converting to data and generating the gradation data.

According to a sixth aspect of the present invention, in the display drive device according to the fourth aspect of the invention, the specific amount detection means is configured such that the light receiving elements are individually arranged so as to correspond to the display pixels. To do.
According to a seventh aspect of the present invention, in the display driving device according to any one of the fourth to sixth aspects, the specific amount detection unit sequentially takes in the specific amount output from each of the light receiving elements in time series. It has a unique input system.
According to an eighth aspect of the present invention, in the display driving device according to any one of the fourth to sixth aspects, the specific amount detection unit is configured to receive a plurality of the specific amounts output from the light receiving elements simultaneously in parallel. The input system is provided.

  According to the ninth aspect of the invention, a plurality of display pixels are arranged at each intersection of a plurality of scanning lines arranged extending in the row direction and a data line arranged extending in the column direction. In accordance with a display panel, a scanning drive circuit that sequentially applies a scanning signal to the display pixels for each row of the display panel at a predetermined timing to set the selected state, and a display signal for displaying desired image information A signal driving circuit that generates a signal voltage and applies the signal voltage to the display pixel in the row set in the selected state, and corrects the signal voltage applied to the display pixel according to the light emission characteristics of each display pixel. A correction control circuit that performs a specific amount related to a light emission characteristic of the display pixel when a specific signal voltage is applied to each of the display pixels by the signal driving circuit. Detect special A quantity detection means, storage means for holding at least gradation data based on the detected specific quantity, gradation data held in the storage means, and the specific signal voltage in the display pixel Based on the comparison result with the gradation data based on the initial value of the specific amount, the signal is supplied to the signal driving circuit so that the relationship between the display signal and the specific amount approaches the relationship in the initial state of the display pixel. And a signal correction unit that generates a correction signal for correcting the display signal and corrects the voltage value of the signal voltage applied to each display pixel.

According to a tenth aspect of the present invention, in the display device according to the ninth aspect, the storage unit further holds gradation data based on an initial value of the specific amount in the display pixel.
According to an eleventh aspect of the present invention, in the display device according to the ninth aspect, the specific amount is detected by the specific amount detecting means when the display panel is turned on and after the display panel is turned on. It is performed at least at any timing after elapse of a predetermined time or more.

  According to a twelfth aspect of the present invention, in the display device according to the ninth aspect, the grayscale signal voltage applied from the signal driving circuit to the display pixel is at least based on the scanning signal applied from the scanning driving circuit. A light emission drive circuit comprising: a selection switch that captures a voltage; a light emission drive switch that passes a drive current having a current value corresponding to the gradation signal voltage; and a storage capacitor that stores a voltage component corresponding to the gradation signal voltage; And a current-controlled light emitting element that emits light at a luminance gradation corresponding to the current value of the drive current.

According to a thirteenth aspect of the present invention, in the display device according to the twelfth aspect, the specific amount detection means is provided at least for the plurality of display pixels for each scanning line or each data line of the display panel, A light receiving element that measures the light emission luminance of the precursor light emitting elements of the plurality of display pixels when the specific signal voltage is applied from a signal driving circuit is provided.
According to a fourteenth aspect of the present invention, in the display device according to the thirteenth aspect, the display signal is composed of digital data, and the specific amount detecting means is configured to convert the signal level of the specific amount output from the light receiving element into digital data. And converting means for generating the gradation data.
According to a fifteenth aspect of the present invention, in the display device according to the thirteenth aspect of the invention, the specific amount detection unit is configured such that the light receiving elements are individually arranged so as to correspond to the display pixels. .

According to a sixteenth aspect of the present invention, in the display device according to any one of the thirteenth to fifteenth aspects, the specific amount detection unit sequentially takes in the specific amount output from each of the light receiving elements in time series. The input system is provided.
According to a seventeenth aspect of the present invention, in the display device according to any one of the thirteenth to fifteenth aspects, the specific amount detection means includes a plurality of the specific amounts output from the light receiving elements simultaneously in parallel. An input system is provided.

  In the invention described in claim 18, the display pixels for each row of the display panel including a plurality of display pixels arranged two-dimensionally are sequentially selected, and a signal voltage corresponding to the display signal is applied to the display panel as desired. In the display device drive control method for displaying the image information, a step of applying a specific signal voltage to each of the display pixels by the signal driving circuit, and a specific amount related to the light emission characteristics of the display pixel A step of detecting, a step of holding gradation data based on the detected specific amount, the held gradation data, and an initial value of the specific amount corresponding to the specific signal voltage in the display pixel. Based on the comparison result with the gradation data based on, the relationship between the display signal and the specific amount is applied to the display pixel so as to be close to the relationship in the initial state of the display pixel. And correcting the voltage value of the serial signal voltage, characterized in that it comprises a.

  According to a nineteenth aspect of the present invention, in the display device drive control method according to the eighteenth aspect, the display pixel passes a drive current having a current value corresponding to the grayscale signal voltage, and the grayscale signal voltage is supplied to the display pixel. A light emission driving circuit that accumulates a voltage component according to the current and a current control type light emitting element that emits light at a luminance gradation according to the current value of the drive current, and a specific amount related to the light emission characteristics of the display pixel The step of detecting is characterized by measuring the light emission luminance of the light emitting element when the specific signal voltage is applied to the light emission drive circuit provided in each of the display pixels. Features.

  According to a twentieth aspect of the present invention, in the display device drive control method according to the eighteenth or nineteenth aspect, the step of applying the specific signal voltage includes each of the plurality of display pixels arranged in a row direction of the display panel. Further, the step of sequentially applying the specific signal voltage and detecting the specific amount related to the light emission characteristics of the display pixel includes the specific amount corresponding to each of the display pixels to which the specific signal voltage is applied. Are sequentially detected.

  In accordance with a twenty-first aspect of the present invention, in the display device drive control method according to the eighteenth or nineteenth aspect, the step of applying the specific signal voltage includes the plurality of display pixels arranged in a row direction of the display panel. The step of applying the specific signal voltage for each of the two or more divided display pixels and detecting the specific amount related to the light emission characteristics of the display pixel is performed by applying the specific signal voltage. The specific amount is detected in parallel corresponding to each of the plurality of display pixels.

According to a twenty-second aspect of the present invention, in the display device drive control method according to any one of the eighteenth to twenty-first aspects, the step of detecting the specific amount is performed when the display panel is turned on and when the display panel is turned on. It is characterized in that it is performed at least at any timing after a predetermined time has elapsed.
The invention according to claim 23 is the drive control method for a display device according to any one of claims 19 to 22, wherein the specific signal voltage is a maximum for causing the light emitting element to perform a light emission operation at a maximum luminance gradation. The gradation voltage is set.
According to a twenty-fourth aspect of the present invention, in the display device drive control method according to any one of the nineteenth to twenty-second aspects, the specific signal voltage causes the light-emitting element to emit light at a plurality of different luminance gradations. The signal voltage is set.

  That is, the display driving device, the display device including the display driving device, and the drive control method thereof according to the present invention apply a gradation signal voltage (signal voltage) corresponding to a display signal (display data) to each display pixel. Thus, a display device that displays desired image information on a display panel by causing a light emitting element (for example, an organic EL element) constituting the display pixel to emit light with a predetermined luminance gradation is provided with a correction control circuit. Thus, when the display panel is turned on or after the display panel is turned on, a specific signal voltage (a gradation signal voltage corresponding to the luminance detection data; As a specific amount related to the light emission characteristics of the display pixel when the highest gradation voltage is applied, the light emission luminance of the light emitting element is measured by a light receiving element (for example, a photodiode), Gradation data detection data digitally converted and is configured to perform the specified amount detection operation of holding as (digital gray scale data).

  In the normal image display operation, the correction control circuit performs gradation data based on the gradation data held in the specific amount detection operation and the light emission luminance corresponding to the specific signal voltage in the initial characteristics of the light emitting element. Data, and generating a correction value (digital value) for each display pixel according to the comparison result, correcting display data for each display pixel based on the correction value, and correcting signal (correction) The data correction operation for correcting the signal voltage applied to each display pixel is performed by supplying the data to a signal driving circuit (data driver) as post-data).

According to this, the light emission luminance of the display pixel (light emitting element) with respect to the supplied display signal based on the specific amount related to the light emission characteristic of the display pixel (light emission luminance of the light emitting element when a specific signal voltage is applied). Since the display signal can be corrected so as to always approximate the initial light emission luminance, the light emitting characteristics of the light emitting element in each display pixel are the functional elements (thin film transistors) constituting the display pixel and the element characteristics of the light emitting element. Even when deterioration or fluctuation due to changes over time or variations occur, grayscale signal voltages appropriately corrected for display data are applied to each display pixel to approximate each light emitting element to its initial state The light emission operation can be performed with the light emission luminance, and the image information can be displayed with good and stable image quality over a long period of time.
Here, the correction control circuit includes conversion means for generating the gradation data by converting a specific amount of signal level obtained from each display pixel into digital data, and is previously held as digital data in the data correction operation. It is possible to apply a method of comparing the initial value of the light emission luminance of the light emitting element corresponding to the displayed signal and the gradation data composed of digital data.

  The light receiving element provided in the correction control circuit (specific amount detection means) is, for example, for each of a plurality of display pixels arranged for each row (scanning line) or each column (data line) constituting the display panel. For example, it may be arranged individually so as to correspond to each of the display pixels constituting the display panel. According to such a configuration, the former can be configured by a significantly smaller number of light receiving elements for a plurality of display pixels arranged on the display panel, thereby reducing the device scale and the manufacturing cost. On the other hand, in the latter, the light emission luminance in each display pixel can be detected directly and accurately, and more accurate correction can be performed.

  Further, the correction control circuit includes only one system as an input system for capturing a specific amount (emission luminance detection data) obtained from each display pixel, and has a configuration for sequentially capturing and holding the specific amount in time series. Alternatively, the input system may include a plurality of parallel systems, and may have a configuration that captures and holds a specific amount from a plurality of display pixels in parallel. According to such a configuration, in the former, a specific amount capturing operation from each display pixel can be realized by a relatively simple control method, while in the latter, a specific amount from a plurality of display pixels is captured in parallel. Therefore, the time required for the capturing operation can be greatly shortened.

Hereinafter, a display drive device, a display device, and a drive control method thereof according to the present invention will be described in detail with reference to embodiments.
<First Embodiment>
<Display device>
First, a schematic configuration of a display device to which the display driving device according to the present invention can be applied will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a first embodiment of an overall configuration of a display device to which a display driving device according to the present invention is applied, and FIG. 2 shows an example of a main configuration of the display device according to this embodiment. It is a schematic block diagram. FIG. 3 is a block diagram illustrating a configuration example of a main part of a data driver applied to the display device according to the present embodiment. In FIG. 2, for convenience of illustration, the gate driver is shown on the left side of the display panel (in FIG. 1, the right side of the display panel). Further, in the following description, a configuration in which an organic EL element is provided as a light emitting element as a display pixel constituting the display panel is shown, but the display device according to the present invention is not limited to this, and the supplied light emission drive is provided. As long as it is a current-controlled light-emitting element that emits light with a luminance gradation according to the current value of the current (drive current), for example, other light-emitting elements such as a light-emitting diode can be favorably applied.

  As shown in FIG. 1 and FIG. 2, the display device 100A according to the present embodiment is roughly composed of a plurality of scanning lines SL1, SL2,. (Hereinafter also referred to as “scanning line SL”) and a plurality of data lines DL1, DL2,... (For convenience, hereinafter referred to as “data line DL”) near each intersection. A display panel 110A in which a plurality of display pixels each including at least a pixel driving circuit (corresponding to the above-described light emission driving circuit) DCA and an organic EL element (current control type light emitting element) OEL are arranged, and each of the display panels 110A Each row is connected to each scanning line SL by sequentially applying high level scanning signals Vscan1, Vscan2,... (Hereinafter also referred to as “scanning signal Vscan”) to each scanning line SL at a predetermined timing. A gate driver (scanning drive circuit) 120 for setting (scanning) the display pixel group to a selected state and each data line DL of the display panel 110A are connected and based on display data (specifically, corrected data described later). A grayscale signal voltage Vdata1, Vdata2,... (Hereinafter also referred to as “grayscale signal voltage Vdata”) and a data driver (signal drive circuit) 130 that supplies the data lines DL to each other at a predetermined timing. A specific amount (light emission luminance) related to the light emission characteristic (or element characteristic) of the organic EL element OEL provided in each display pixel is detected, and the data driver 130 is configured to maintain the light emission characteristic in a constant state. The correction control circuit 140A that corrects the supplied display data, and at least the operation states of the gate driver 120, the data driver 130, and the correction control circuit 140A. A display controller (display signal) including a digital signal based on a system controller 150 that generates and outputs a scanning control signal, a data control signal, and a correction control signal for control, and a video signal supplied from the outside of the display device 100A. ) And supplied to the data driver 130 via the correction control circuit 140A, and a timing signal (system clock or the like) for displaying the display data on the display panel 110A is extracted or generated. And a display signal generation circuit 160 to be supplied to the system controller 150.

Hereafter, each said structure is demonstrated.
(Display panel 110A)
For example, as shown in FIG. 2, the display panel 110 </ b> A applicable to the display device according to the present embodiment includes a scanning line SL and a data line DL arranged so as to be orthogonal to each other, as well as each data line DL. The power lines VL1, VL2,... (Hereinafter also referred to as “power lines VL”) arranged in parallel are provided at the intersections of the scanning lines SL, the data lines DL, and the power lines VL as described above. The pixel driving circuit DCA having a circuit configuration equivalent to that of the light emission driving circuit DCP shown in the prior art (see FIG. 10) and a display pixel including the organic EL element OEL are connected.

  That is, as shown in FIG. 2, each display pixel includes an n-channel thin film transistor (selection transistor; selection switch) having a gate terminal connected to the scanning line SL and a source terminal and a drain terminal connected to the data line DL and the contact N11. ) Pixel drive circuit DCA including Tr11, and a p-channel type thin film transistor (light emission drive transistor; light emission drive switch) Tr12 having a gate terminal connected to the contact N11 and a source terminal connected to the power supply line VL, and an anode terminal Is connected to the drain terminal of the thin film transistor Tr12 of the pixel driving circuit DCP, and has an organic EL element OEL whose cathode terminal is connected to the ground potential (Vgnd). In the pixel drive circuit DCA shown in FIG. 2, Ca is a parasitic capacitance formed between the gate and source of the thin film transistor Tr12 or an auxiliary capacitance formed additionally.

  In the present embodiment, as shown in FIG. 2, each display pixel (pixel drive circuit DCA and organic EL element OEL) has a specific amount related to the light emission state of the organic EL element OEL, that is, the organic EL element. The light receiving element for measuring the light emission luminance of the OEL has a configuration in which the light receiving element is individually provided in the vicinity of the organic EL element OEL. Specifically, each display pixel receives light emitted from the organic EL element OEL to measure the light emission luminance of the organic EL element OEL. One end is connected to the high potential voltage Vdd and the other end is connected to the display pixel. A photodiode (light receiving element) PD connected to the contact N21, a resistor Rp having one end connected to the contact N21 and the other end connected to the ground potential, and a gate terminal serving as a reset signal line VR (VR1, VR2,... )), An n-channel thin film transistor Tr23 having a source terminal and a drain terminal connected to the contact N21 and the ground potential, an n-channel thin film transistor Tr23 connected to the contact N21, and a source terminal connected to the power supply line VL, respectively. A channel-type thin film transistor Tr21, a gate terminal on the scanning line SL, and a source terminal and a drain terminal on the thin film transistor Tr21 Drain and detection line FL (FL1, FL2, · · ·) and a thin film transistor Tr22 of each connected n-channel type, the luminance detection circuit (specific amount detecting means) NFA equipped with is provided in the. Here, the detection line FL and the reset signal line VR are individually arranged in parallel to the data line DL for each column, and one end side of each detection line FL is corrected later, through a common input line IL. In addition to being commonly connected to the input terminal of the amplifier AMP provided in the circuit 140A, one end side of each reset signal line VR is commonly connected to the correction control circuit 140A via the common input line IR.

  In the display pixel having such a configuration, based on the scanning signal Vscan applied from the gate driver 120 to the scanning line SL at a predetermined timing and the gradation signal voltage Vdata applied from the data driver 130 to the data line DL. Thus, the light emission drive current flowing through the organic EL element OEL is controlled by the pixel drive circuit DCA, and the light emission operation and the luminance gradation during light emission are controlled.

  Further, the display data (digital data) supplied to the data driver 130 is corrected by the correction control circuit 140A described later based on the light emission luminance (detection data) detected by the luminance detection circuit NFA provided in each display pixel. Thus, based on the gradation signal voltage Vdata applied from the data driver 130 to each display pixel, the light emission drive current flowing through each display pixel (pixel drive circuit DCA) is a current corresponding to the light emission characteristics of each organic EL element OEL. It is corrected to have a value. A specific drive control operation will be described later.

  In the embodiment, as the pixel driving circuit DCA constituting the display pixel, an n-channel thin film transistor (selection transistor) Tr11 and a p-channel thin film transistor (light emission driving transistor) are provided, as in the configuration shown in the related art. The case where the circuit configuration including Tr12 is applied has been described. According to such a circuit configuration, since the p-channel type and the n-channel type thin film transistor are mixed, it is possible to manufacture a thin film transistor having good operating characteristics by applying a polysilicon process. In addition, it is possible to realize a pixel driving circuit in which variation in light emission characteristics of display pixels is suppressed.

  Further, the pixel driving circuit applicable to the present invention is not limited to the circuit configuration in which the p-channel type and the n-channel type thin film transistor are mixed as described above, but has a circuit configuration including a single-channel type thin film transistor. It can also be applied. That is, in the present embodiment, only an example applicable as a pixel driving circuit is shown, in short, at least a selection transistor that sets a display pixel (pixel driving circuit) to a selected state based on a scanning signal; Any other pixel drive circuit including a light emission drive transistor that generates a predetermined light emission drive current based on display data based on the gradation signal voltage applied in the selected state and supplies the light emission element to the light emission element. It may have a circuit configuration.

(Gate driver 120)
The gate driver 120 sets a display pixel group for each row to a selected state by sequentially applying a high level scanning signal Vscan to each scanning line SL based on the scanning control signal supplied from the system controller 150. Control is performed so that a predetermined gradation signal voltage Vdata applied by the data driver 130 via the data line DL is written to the pixel driving circuit DCA.

  Here, specifically, for example, as shown in FIG. 2, the gate driver 120 includes a plurality of stages of shift blocks SB each including a shift register and a buffer corresponding to each scanning line SL. The shift signal is sequentially shifted from the upper side to the lower side of the display panel 110A by the shift register based on the scanning control signal (scanning start signal SST, scanning clock signal SCK, etc.) supplied from the buffer, and the generated shift signal is buffered. Then, the signal is converted to a predetermined voltage level (high level) and is output to each scanning line SL as a scanning signal Vscan (Vscan1 to VscanN).

(Data driver 130)
Based on the data control signal supplied from the system controller 150, the data driver 130 outputs display data (corrected data) that is output from the display signal generation circuit 160 and consists of a digital signal supplied via the correction control circuit 140 </ b> A. The analog signal voltage corresponding to the display data is generated and held at a predetermined timing, and is applied to each data line DL as the gradation signal voltage Vdata.

Here, specifically, the data driver 130 sequentially shifts the shift signal based on the data control signals (shift clock signal CLK, sampling start signal STR) supplied from the system controller 150, for example, as shown in FIG. Shift register circuit 131 that outputs the data, and data that sequentially captures display data (corrected data) for one row supplied from display signal generation circuit 160 via correction control circuit 140A based on the input timing of the shift signal Based on the register circuit 132, the data latch circuit 133 that collectively holds display data for one row fetched by the data register circuit 132 based on the data control signal (data latch signal STB), and the gradation reference voltages V0 to Vp. Based on this, the stored display data is changed to a predetermined analog signal voltage. Output circuit that applies the analog signal voltage as the gradation signal voltage Vdata (Vdata1 to VdataM) to each data line DL at a timing based on the D / A converter 134 and the data control signal (output enable signal OE). 135.
By such a data driver 130, a gradation signal voltage (analog signal) Vdata corresponding to corrected data (display data) composed of a digital signal supplied from the display signal generation circuit 160 via the correction control circuit 140A is generated. Then, the data lines DL are output collectively or sequentially at a predetermined timing.

(Correction control circuit 140A)
For example, as illustrated in FIG. 2, the correction control circuit 140 </ b> A has a specific amount related to light emission characteristics in each display pixel (organic EL element OEL), specifically, a grayscale signal voltage corresponding to a specific grayscale level. The detection data (analog signal level) output from each luminance detection circuit NFA that measures the light emission luminance of the organic EL element OEL in a state where voltage is applied is input via each detection line FL and the common input R line IL. An amplifier (amplifier) AMP, and an analog-digital converter (hereinafter referred to as “A / D”) that converts the detected data amplified to a predetermined signal level by the amplifier AMP into analog grayscale data by performing analog-digital conversion processing. Abbreviated as “converter”; conversion means) a buffer for sequentially taking in the ADC and the digital gradation data for each display pixel and temporarily storing them. Storage unit (storage means) BM composed of a memory or the like, and provided between the display signal generation circuit 160 and the data driver 130, and for the display data (digital signal) supplied from the display signal generation circuit 160, the storage The digital gradation data for each display pixel (organic EL element OEL) stored in the unit BM is compared with the digital gradation data based on the initial emission luminance of each display pixel stored in advance to generate a correction value. Based on the correction value, correction processing is performed in a direction in which the light emission luminance in the display data of the specific gradation level is always equal to the initial light emission luminance, and the correction value is sent to the data driver 130 after correction (correction signal). And a comparison correction unit (signal correction means) CMR.

  Here, the correction control circuit 140 configured as described above captures the operation state (at least detection data based on the emission luminance detected in each display pixel) based on a correction control signal output from the system controller 150 described later. Whether or not to perform the specific amount detection operation to be held is controlled. Note that the digital gradation data based on the initial light emission luminance of each display pixel may be stored in the storage unit BM at the time of factory shipment, for example. It may be stored in a storage unit different from the BM.

(System controller 150)
The system controller 150 scans each of the gate driver 120, the data driver 130, and the correction control circuit 140A with a scan control signal (such as the scan start signal SST and the scan clock signal SCK described above) and a data control signal (which are described above). The output enable signal OE, the data latch signal STB, the sampling start signal STR, the shift clock signal CLK, etc.) and the correction control signal are output to operate each driver and the control circuit at a predetermined timing to generate a display signal. The display data output from the circuit 160 is corrected based on a predetermined correction value, and the scanning signal Vscan and the gradation signal voltage Vdata are generated and applied to each scanning line SL and data line DL to be applied to each display pixel. The flash operation is executed continuously, Performs control to display the image information based on the image signal to the display panel 110A.

(Display signal generation circuit 160)
For example, the display signal generation circuit 160 extracts a luminance gradation signal component from a video signal supplied from the outside of the display device 100A, and converts the luminance gradation signal component into a digital signal for each row of the display panel 110A. Is supplied to the data register circuit 132 of the data driver 130 through the correction control circuit 140A. Here, when the video signal includes a timing signal component that defines the display timing of the image information, such as a television broadcast signal (composite video signal), the display signal generation circuit 160 is as shown in FIG. In addition to the function of extracting the luminance gradation signal component, a function of extracting the timing signal component and supplying it to the system controller 150 may be provided. In this case, the system controller 150 performs scanning control signals and data individually supplied to the gate driver 120, the data driver 130, and the correction control circuit 140A based on the timing signal supplied from the display signal generation circuit 160. A control signal and a correction control signal are generated.

  When the video signal supplied from the outside of the display device 100 is formed by a digital signal and the timing signal is supplied separately from the video signal, the video signal (digital signal) is used as display data as it is. The display signal generation circuit 160 may be omitted by supplying the data signal to the data driver 130 via the correction control circuit 140A and supplying the timing signal directly to the system controller 150. In the display device drive control method described below, as shown in FIG. 1, display data is generated by the display signal generation circuit 160 based on the video signal and supplied to the data driver 130 via the correction control circuit 140A. The case where it will be described.

<Display device drive control method>
Next, a drive control operation (drive control method) in the display device having the above-described configuration will be specifically described with reference to the drawings.
FIG. 4 is a timing chart illustrating an example of the specific amount detection operation applied to the display device drive control method according to the present embodiment.

  The drive control method in the display device according to the present embodiment includes an image display operation for displaying desired image information on the display panel 110A and a normal image display operation based on a video signal supplied from the outside of the display device 100A. Prior to, for example, a specific amount related to the light emission characteristics of each display pixel (light emission luminance of the organic EL element OEL) at a timing when the display panel is turned on, or at an appropriate timing after the image display operation has elapsed for a predetermined time. A correction value is generated based on the digital gradation data obtained by the specific amount detection operation and the specific amount detection operation that is detected and held as digital gradation data and the image display operation. And a data correction operation for correcting display data (digital signal) supplied to the data driver 130. Hereinafter, each operation will be described. The execution timing of the specific amount detection operation will be described later.

(Specific amount detection operation)
First, in the specific amount detection operation according to the present embodiment, at least a correction control signal for executing a specific amount fetching and holding operation in the correction control circuit 140 is supplied from the system controller 150, and the gate driver 120 and data In the driver 130, the scanning control signal and the data control signal for executing the following operations are supplied.

  In the specific amount detection operation, as shown in FIG. 4, the reset signal Vreset is first input based on the correction control signal supplied from the system controller 150 to the correction control circuit 140A at a timing prior to the supply of the scanning control signal. It is applied to each reset signal line VR (VR1, VR2,...) Via the line IR. Accordingly, the thin film transistor Tr23 of each luminance detection circuit NFA is turned on, and a reset operation is performed in which the potential of the gate terminal of the thin film transistor Tr21 is set to the ground potential.

  Next, at a timing based on the scanning control signal supplied from the system controller 150, the gate driver 120 continues the high-level scanning signal Vscan1 to the first scanning line SL1 for a predetermined period (for example, one horizontal scanning period). By applying, the thin film transistor (select transistor) Tr11 provided in the pixel driving circuit DCA of each display pixel connected to the scanning line SL1 is turned on, and the display pixel group in the row is set to the selected state. At this time, when the scanning signal is applied to the scanning line SL1, the thin film transistor Tr22 of the luminance detection circuit NFA provided for each display pixel set in the selected state is also turned on, and the detection data from the photodiode PD Is set to a detection standby state in which it can be taken out.

  Next, in this selection state (selection period), for example, the highest gradation display (light emission operation at the highest gradation level) is performed only for the display pixels in the first column as luminance detection data for the data driver 130. For example, serial data (display data) composed of digital signals for performing the lowest gradation display (light emission operation at the optimum gradation level; black display operation) is supplied to display pixels in other columns. Is done. As a result, the data driver 130 at the timing based on the data control signal supplied from the system controller 150, as shown in FIG. 4, based on the luminance detection data, the gray level composed of the highest gray scale voltage (MSB). The first row set to the selected state via each data line DL by generating gradation signal voltages Vdata2 to VdataM composed of the signal voltage (specific signal voltage) Vdata1 and the lowest gradation voltage (Vgnd). The display pixel group is simultaneously applied.

  Thereby, the gradation signal voltages Vdata1 to VdataM applied to each data line DL are applied to the gate terminal of the thin film transistor Tr12 via the thin film transistor Tr11 of the pixel drive circuit DCA provided in each display pixel. Only the thin film transistor Tr12 provided in the pixel driver circuit DCA of the display pixel in the first row and first column is turned on in a conductive state according to the gate voltage (that is, the gradation signal voltage Vdata1), and the display pixels in other columns The thin film transistor Tr12 is turned off.

  Therefore, only in the thin film transistor Tr12 provided in the pixel driving circuit DCA of the display pixel in the first row and first column, according to the potential difference between the high potential voltage Vdd and the ground potential Vgnd and the voltage value of the gradation signal voltage Vdata1. A light emission driving current flows from the high potential voltage Vdd side to the ground potential Vgnd via the thin film transistor Tr12 and the organic EL element OEL, and the organic EL element OEL operates to emit light at a luminance gradation corresponding to the highest gradation level, and the other columns. The organic EL element OEL of the display pixel maintains a non-light emitting state.

In the display pixel in the first row and the first column, the light of the highest gradation level emitted from the organic EL element OEL is applied to the photodiode PD provided at a position close to the organic EL element OEL for each display pixel. When incident, a signal current corresponding to the intensity of the light (light receiving intensity; corresponding to the light emission luminance of the organic EL element OEL) flows from the high potential voltage Vdd to the ground potential via the photodiode PD and the resistor Rp, and contacts N21 That is, a voltage corresponding to the received light intensity is generated at the gate electrode of the thin film transistor (amplification transistor) Tr21 provided in the luminance detection circuit NFA. As a result, the thin film transistor Tr21 is turned on in a conductive state corresponding to the voltage (light receiving intensity), so that the thin film transistors Tr21 and Tr22, the detection line FL, the input line from the high potential power supply Vdd connected to the power supply line VL. Detection data having a signal level corresponding to the light reception intensity of the photodiode PD, that is, the light emission luminance of the organic EL element OEL, is input to the correction control circuit 140A via the IL.
As described above, this detection data is amplified to a predetermined signal level by a single amplifier AMP commonly connected to each detection line FL, and then converted into a digital signal by an A / D converter ADC. It is stored as digital gradation data in a predetermined storage area of the storage unit BM.

  Next, in the display pixel group set in the selected state, the highest gradation display is performed only for the display pixels in the second column, and the lowest gradation display is performed for the display pixels in the other columns. By supplying the data for luminance detection to be performed to the data driver 130, as shown in FIG. 4, only the data line DL2 in the second column is the highest, as in the display pixels in the first column described above. A gradation signal voltage (signal voltage for luminance detection) Vdata2 composed of a gradation voltage (MSB) is applied, and a gradation signal voltage Vdata1 composed of the lowest gradation voltage (Vgnd) is applied to the other data lines. , Vdata3 to VdataM are applied.

As a result, the organic EL element OEL provided in the pixel drive circuit DCA of the display pixel in the first row and second column emits light at the highest gradation level based on the gradation signal voltage Vdata2, and displays other columns. Since the organic EL element OEL of the pixel maintains a non-light-emitting state, detection data having a signal level corresponding to the light emission luminance of the organic EL element OEL in the display pixel in the first row and second column passes through the detection line FL. Is input to the correction control circuit 140A, converted into a digital signal, and stored as digital gradation data in a predetermined storage area of the storage unit BM.
Hereinafter, the specific amount detection operation (light emission operation and luminance detection operation) in each display pixel is repeatedly performed sequentially on each display pixel in the row set to the selected state, whereby the first row A specific amount related to light emission characteristics in each display pixel (organic EL element OEL) is acquired and held.

  Next, as shown in FIG. 4, the scanning signal Vscan1 applied to the scanning line SL1 of the first row by the gate driver 120 is switched to a low level, whereby each display pixel (pixel driving circuit DCA) of the first row is switched. The thin film transistor Tr11 is turned off to set the display pixel group in the row to a non-selected state. At this time, the thin film transistor Tr22 of the luminance detection circuit NFA provided for each display pixel is also turned off, so that the detection data from the photodiode PD is not output and set to a non-detection state.

Then, in synchronization with this timing or after this timing, as shown in FIG. 4, the gate driver 120 continuously applies the high level scanning signal Vscan2 to the second scanning line SL2 for a predetermined period. As a result, the display pixel group connected to the scanning line SL2 is set to the selected state, and the specific amount detection operation (luminance detection data in the display pixels in each column is performed as in the case of the display pixel group in the first row described above. The light emission operation and the detection of the light emission luminance, and the digital gradation data holding operation based on the above are performed sequentially and repeatedly on the display pixels in each column of the second row, thereby relating to the light emission characteristics of each display pixel in the second row. A specific amount is acquired and retained.
Hereinafter, by repeating the same operation sequentially for each row, a specific amount related to the light emission characteristics in all the display pixels (organic EL elements OEL) constituting the display panel 110A can be acquired as digital gradation data. .

Here, the specific amount detection operation shown in the present embodiment may be executed in advance at an arbitrary timing prior to an image display operation to be described later, or when the display device is activated or terminated, an image display is performed. It may be executed regularly or irregularly, such as during a standby time other than when the operation is executed.
Further, in the present embodiment, a case has been described in which display data corresponding to the highest gradation level is supplied to the data driver 130 as luminance detection data, and a gradation signal voltage Vdata corresponding to this is supplied to each display pixel. However, the present invention is not limited to this, and the organic EL element OEL of each display pixel may be operated to emit light at a luminance gradation corresponding to another gradation level.

  Further, in the present embodiment, the configuration for supplying the luminance detection data to the data driver 130 during the specific amount detection operation is not particularly limited, but for example, a predetermined value of the storage unit BM provided in the correction control circuit 140A The luminance detection data may be stored in the storage area in advance and read as appropriate, or the luminance detection data may be read by the display signal generation circuit 160 or from the outside of the display device 100A via the display signal generation circuit 160. It may be supplied.

(Execution timing of specific amount detection operation)
Next, timing for executing the above-described specific amount detection operation will be described.
FIG. 5 is a flowchart showing an example of a drive control operation related to the specific amount detection operation according to the present embodiment.
For example, as illustrated in FIG. 5, the specific amount detection operation according to the present embodiment is first performed at a timing prior to the subsequent normal display operation immediately after the display panel is powered on. In this case, for example, it is performed at a timing prior to the start of use of an electronic device or the like provided with the display panel. In addition, the timing is not limited to when the power to the device main body is turned on.For example, when the device is in a standby state, the power supply to the display panel is cut off and the display is turned off. Thus, the timing immediately after the power supply to the display panel is turned on again and the display is started may be used. By performing the specific amount detection operation at these timings, the specific amount detection operation can be performed and the signal voltage can be corrected satisfactorily without affecting the usability of the electronic device.

Next, as illustrated in FIG. 5, the specific amount detection operation according to the present embodiment may be performed at a timing after a normal display operation by the display panel is performed and a predetermined time has elapsed. . That is, a specific amount detection operation is performed at predetermined time intervals during a display operation, and signal voltage is corrected as needed, depending on the degree of deterioration of characteristics of the light emitting element (organic EL element OEL) used for the display pixel. Set the required predetermined time. In this case, for example, when the electronic device is in a standby state after a predetermined time has elapsed in order to avoid switching to the specific amount detection operation state during use of the electronic device including the display panel. Alternatively, a specific amount detection operation may be performed.
In the above description, the specific amount detection operation is executed at a timing immediately after power is supplied to the display panel and at a timing after a predetermined time has elapsed since the normal display operation was performed. It may be executed only at any one timing.

(Image display operation / data correction operation)
Next, the normal image information display operation and data correction operation in the present embodiment will be described.
FIG. 6 is a timing chart showing an example of an image display operation applied to the display device drive control method according to the present embodiment. Here, the operation equivalent to the above-described specific amount detection operation will be described in a simplified manner.

  In the normal image display operation in the present embodiment, at least the specific amount detection operation is stopped from the system controller 150 to the correction control circuit 140A in the display device shown in FIGS. A correction control signal for executing a data correction operation for correcting display data from 160 is supplied, and a scan control signal for executing the following operation for the gate driver 120 and the data driver 130. And a data control signal is supplied.

  In the image display operation, first, display data for one row is displayed by the display signal generation circuit 160 (display data corresponding to the display pixel group in the i-th row of the display panel 110A having n rows × m columns; 1 ≦ i ≦ n). ) Is supplied to the data driver 130 via the comparison correction unit CMR of the correction control circuit 140A. Here, the display data output from the display signal generation circuit 160 is, for example, serial data including a digital signal generated based on a video signal supplied from the outside of the display device 100A. Degradation of the light emission characteristics of the display pixels constituting the display panel 110A (that is, due to temporal changes and variations in element characteristics of the thin film transistors Tr11 and TR12 and the organic EL element OEL constituting the pixel driving circuit DCA provided in each display pixel) This does not take into consideration the variation in the light emission luminance of the organic EL element OEL.

  Therefore, in the image display operation in the present embodiment, a specific amount (a specific gradation signal voltage applied to the light emission characteristics of each display pixel, which is acquired by the above-described specific amount detection operation and held in the storage unit BM, is applied. The digital gradation data corresponding to the light emission luminance of the organic EL element OEL) and the initial value of the light emission luminance of the organic EL element at the gradation signal voltage corresponding to the display data supplied in the image display operation. Then, based on the comparison result, a correction value (digital value) for causing the emission luminance of each display pixel (organic EL element OEL) to approximate the initial emission luminance is generated, and the display signal generation circuit The display data for each display pixel supplied from 160 is corrected based on the correction value, and supplied to the data driver 130 as corrected data (data Positive operation).

The data driver 130 generates the gradation signal voltage Vdata corresponding to each display pixel in the i-th row based on the corrected data supplied via the correction control circuit 140A (comparison correction unit CMR), Apply all at once to the data line DL of the column.
At this time, as shown in FIG. 6, the gate driver 120 applies a high-level scanning signal Vscani to the i-th scanning line SLi, so that the thin film transistor provided in the pixel driving circuit DCA of each display pixel in the row. The (selection transistor) Tr11 is turned on, and a gate voltage based on the gradation signal voltage Vdata applied to each data line DL is applied to the gate terminal of the thin film transistor (light emission drive transistor) Tr12. It is turned on in the corresponding conduction state.

  Thereby, the thin film transistor Tr12 and the organic EL element OEL of the display pixel group in the i-th row (for example, the display pixel in the i-th row and the j-th column; 1 ≦ j ≦ m) are connected from the high potential voltage Vdd side through the power supply line VL. , A light emission driving current having a current value based on the gradation signal voltage Vdataj flows, and the organic EL element OEL emits light with a predetermined luminance based on display data (strictly, display data after correction) (selection period Tse). ). At this time, the gate-source parasitic capacitance Ca is charged by the potential difference generated between the gate and the source of the thin film transistor Tr12. Here, since the gradation signal voltage Vdata applied to each display pixel is set (corrected) based on the initial light emission luminance of the light emitting element by the data correction operation, each organic EL element OEL. Emits light with a luminance gradation approximate to the initial state.

Next, as shown in FIG. 6, the gate driver 120 applies a low-level scanning signal Vscani to the i-th scanning line SLi, so that the thin film transistor Tr11 provided in the pixel driving circuit DCA of the display pixel group in the row is displayed. By turning off, the application of the gradation signal voltage Vdatai to the gate terminal of the thin film transistor Tr12 is cut off. At this time, since the potential difference applied between the gate and the source of the thin film transistor Tr12 during the selection period Tse is held as a voltage component in the gate-source parasitic capacitance Ca, the thin film transistor Tr12 is turned on by this voltage component. And a light emission drive current equivalent to the selection period Tse flows through the thin film transistor Tr12 and the organic EL element OEL of each display pixel in the i-th row, and continues the operation of emitting light with a luminance gradation approximate to the initial state (non- Selection period Tnse).
The total period of the selection period Tse and the non-selection period Tnse set in such an image display operation is, for example, one frame period Tcyc that is an operation period for displaying image information for one screen on the display panel 110A. Is set as follows.

Hereinafter, similarly, as for the display pixel group in the (i + 1) th row, as shown in FIG. 6, the scanning signal Vscan (i + 1) is applied to the scanning line SL (i + 1) in the selection period Tse. Thus, the gradation signal voltage Vdata based on the corrected display data (corrected data) is applied to each display pixel in the row via the data line DL in each column, and the organic EL element OEL performs a light emission operation. At the same time, the voltage component accompanying the light emission operation is held in the parasitic capacitance Ca. In the non-selection period Tnse, the operation in which each display pixel (organic EL element OEL) in the row emits light with a predetermined luminance gradation is maintained based on the voltage held in the parasitic capacitance Ca of each display pixel. The
By sequentially repeating a series of image display operations including such data correction operations for each row, image information for one screen is displayed on the display panel 110A.

  Therefore, according to the display device and the drive control method thereof according to the present embodiment, the specific amount is set before the image display operation or at any timing other than the time of the image display operation (such as when the display device is activated or at the standby time). By executing a measurement operation, digital gradation data related to light emission characteristics (light emission luminance) in each display pixel (organic EL element) is captured in response to application of a specific gradation signal voltage based on luminance detection data. And generating a correction value corresponding to the light emission characteristics for each display pixel based on the digital gradation data (that is, a gradation signal generated based on the corrected data corrected based on the correction value) The correction value can be set in advance so that the light emission luminance obtained when the light emitting element of each display pixel emits light is approximated to the initial light emission luminance by the voltage.

  Thus, in a normal image display operation, the display data supplied to the data driver is subjected to correction processing based on the correction value, and the light emission characteristics of each display pixel (that is, the pixel driving circuit provided in each display pixel) The data correction operation is performed to correct the digital data (corrected data) according to the change in the light emission luminance of the organic EL element due to the time-dependent changes and variations in the element characteristics of the thin film transistors and organic EL elements that constitute the gray scale signal. Since a voltage can be generated and applied to each display pixel, the relationship of the light emission luminance of the organic EL element (light emitting element) to the luminance gradation specified by the display data is always maintained in a state that approximates the initial state. It is possible to correct the deterioration and variation of the light emission characteristics of each display pixel (light emitting element), and to display a good and stable image information over a long period of time. In can be displayed.

<Second Embodiment of Display Device>
Next, a second embodiment of a display device to which the display driving device according to the present invention can be applied will be described with reference to the drawings.
FIG. 7 is a schematic configuration diagram illustrating a configuration example of a main part of a display device to which the display drive device according to the second embodiment is applied. FIG. 8 is applied to the drive control method for the display device according to the present embodiment. It is a timing chart which shows an example of a specific amount detection operation. Here, about the structure equivalent to 1st Embodiment mentioned above, the same code | symbol is attached | subjected and the description is simplified or abbreviate | omitted. The operation equivalent to the above-described specific amount detection operation will be described in a simplified manner.

  In the above-described first embodiment, in the specific amount detection operation, a specific gradation is set for each display pixel in each column (for each display pixel) with respect to the display pixel group in the specific row set in the selected state. A gradation signal voltage based on luminance detection data composed of levels is applied, and in that case, the intensity (light reception intensity) of light emitted from the organic EL element is detected, and stored individually as digital gradation data in the storage unit In the present embodiment, the detection operation is sequentially repeated for the number of display pixels in one row (for the number of columns), and a configuration corresponding to the method is described. The display pixel group has a method for executing the detection operation in parallel for each predetermined number of display pixels (for each of a plurality of display pixels) and a configuration corresponding to the method.

  That is, as shown in FIG. 7, the display panel 110B and the correction control circuit 140B applied to the present embodiment are arranged in each display pixel two-dimensionally arranged on the display panel 110B, as in the first embodiment described above. And a configuration in which a luminance detection circuit NFB including a photodiode PD for measuring a specific amount (light emission luminance) related to the light emission state of the organic EL element OEL is provided, and according to the light emission luminance of the organic EL element OEL Detection data detected by the photodiode PD passes through a plurality of detection lines FL1, FL2, FL3,... It is configured to be taken into the D converter ADC and stored in an individual storage area of the storage unit BM. Here, the luminance detection circuit NFB has the same configuration as the luminance detection circuit NFA in the first embodiment.

  Specifically, as shown in FIG. 7, the display pixel groups connected to the data lines DL1, DL2, DL3,... In each column are connected to the individual detection lines FL1, FL2, FL3,. In addition, the amplifiers AP1, AP2, AP3 and the A / D converter ADC provided in the correction control circuit 140B each have inputs of a plurality of systems (in this embodiment, for convenience, three systems). In the detection line group, for example, the detection lines FL in the first row, the fourth row,... Are connected to the first embodiment via the first input line (first input system) IL1. Amplification processing and A / D conversion processing equivalent to the above are performed and stored in the storage unit BM, and the detection lines FL in the second column, the fifth column,... Are second input lines (second input systems). ) A predetermined amplification process and A / D conversion process are performed via IL2, and stored in the storage unit BM. The detection lines FL in the third, sixth,. A predetermined amplification process and A / D conversion process are performed via the third input system (IL3) and stored in the storage unit BM.

  In particular, as shown in FIG. 7, the correction control circuit 140B applied to the present embodiment is specified according to the detection lines FL1, FL2, FL3,... And the column numbers of the display pixels from each display pixel. Amplifiers that specifically amplify detection data input via input lines (input systems) IL1, IL2, and IL3 to a predetermined signal level in parallel in each input system (specifically, for each input system individually) Three amplifiers provided) AP1, AP2, AP3 and detection data (analog signals) output in parallel via the amplifiers AP1, AP2, AP3 in parallel via each input system An A / D converter (specifically, an individual A / D converter provided for each input system) ADC that performs digital conversion processing and converts it into digital gradation data is input in parallel for each system. The storage unit BM that takes in digital gradation data of each display pixel in parallel or sequentially and temporarily stores it, and the storage for the display data (digital signal) supplied from the display signal generation circuit 160. The digital gradation data for each display pixel stored in the unit BM is compared with the digital gradation data based on the initial light emission luminance of each display pixel stored in advance, and a correction value is generated based on the comparison result Then, the display data is corrected using the correction value in the direction in which the light emission luminance in the display data is always equal to the initial light emission luminance, and the voltage value of the gradation signal voltage generated in the data driver 130 is set. And a correction unit CMR.

  As shown in FIG. 8, the drive control method (specific amount detection operation) in the display device according to the present embodiment is first reset at the timing prior to the supply of the scanning control signal, as in FIG. The signal Vreset is applied to each reset signal line VR (VR1, VR2,...), And a reset operation is performed in which the potential of the gate terminal (contact N21) of the thin film transistor Tr21 is set to the ground potential. Next, the gate driver 120 continuously applies a high level scanning signal Vscan1 to the scanning line SL1 in the first row, thereby setting each display pixel connected to the scanning line SL1 to a selected state. At the same time, the luminance detection circuit NFB provided for each display pixel set in the selected state is set in a detection standby state in which the light emission luminance in the organic EL element OEL can be detected.

In this selection state (selection period), only the display pixels in the first to third columns emit light at a predetermined gradation level (for example, the maximum gradation level) as luminance detection data for the data driver 130. Serial data for performing the operation is supplied. Thereby, as shown in FIG. 8, the data driver 130 supplies a gradation signal voltage corresponding to a predetermined gradation level to be supplied to the display pixels in the first to third columns based on the luminance detection data. (Highest gradation voltage; MSB) Vdata1 to Vdata3 and gradation signal voltages Vdata4 to VdataM composed of the lowest gradation voltage (Vgnd) to be supplied to the display pixels in the fourth column and thereafter are generated, and each data Via the line DL, it is applied to the display pixel group set in the selected state all at once.
Accordingly, only the organic EL elements OEL of the display pixels in the first row to the third column emit light at a luminance gradation corresponding to the highest gradation level, and the organic EL elements OEL of the display pixels in the other columns are non-displayed. Maintain the light emission state.

  In the display pixel in the first row to the third column, the light of the highest gradation level emitted from each organic EL element OEL is a photo provided at a position close to the organic EL element OEL for each display pixel. The luminance detection circuit NFB including the diode PD is converted into a signal current corresponding to the light emission luminance in the organic EL element OEL, and the correction control circuit 140B via the thin film transistors (amplification transistors) Tr21 and Tr22 and the detection lines FL1, FL2, and FL3. Is taken in. Here, as described above, the correction control circuit 140B includes, for example, three systems of input lines IL1, IL2, and IL3, and the light emission luminance (detection data) detected in the display pixels (luminance detection circuit) in the first column. Is taken in via the first input line (first input system) IL1, and the emission luminance (detection data) detected in the display pixels (luminance detection circuit) in the second column is the second input line ( The light emission luminance (detection data) taken in via the second input system (IL2) and detected by the display pixels (luminance detection circuit) in the third column is transmitted to the third input line (third input system) IL3. Is taken in through.

  The detection data taken in through different input systems is amplified to predetermined signal levels by amplifiers AP1, AP2, AP3 provided individually for each input line (input system) IL1, IL2, IL3, respectively. The A / D converter ADC converts each input system into a digital signal individually, and stores it as a digital gradation data in a predetermined storage area of the storage unit BM all at once or sequentially for each column. .

In the same manner, a light emission operation (maximum gradation display) at a predetermined gradation level is performed on the display pixels in the fourth to sixth columns, the seventh to ninth columns,. The light emission luminance of the organic EL element OEL is detected by the photodiode PD, and specific amount detection operations are sequentially taken in the correction control circuit 140B and held in the storage unit BM via individual input lines (input systems) IL1, IL2, and IL3. By repeatedly executing, a specific amount related to the light emission characteristic in each display pixel (organic EL element OEL) in the first row is acquired and held.
Then, by repeating such a specific amount detection operation for each row for each display pixel (organic EL element OEL) in the second and subsequent rows, all the display pixels (organic EL elements) constituting the display panel 110B are repeatedly executed. A specific amount related to light emission characteristics in OEL) can be acquired as digital gradation data.

Therefore, according to the display device and the drive control method thereof according to the present embodiment, the light emission of the organic EL element with respect to the specific gradation signal voltage applied to each display pixel based on the luminance detection data in the specific amount measurement operation. Detection data corresponding to luminance can be captured and held in the correction control circuit in parallel for each of a plurality of display pixels via a plurality of input systems configured in parallel. The time required for the specific amount measurement operation can be greatly reduced as compared with the case where the detection data is sequentially captured and held via the input system.
As a result, even when the specific amount detection operation is executed at the time of starting or ending the apparatus, or at the time of waiting for operation, it is possible to quickly start or end, or to return from the standby state to the image display state or the like. The response characteristics of the display device can be improved.

  In the present embodiment, for convenience of explanation, the correction control circuit has three input lines and is detected from three consecutive display pixels in the display pixel group in the row set to the selected state. However, the present invention is not limited to this, and the present invention is not limited to this, and includes a larger number of input systems and captures them in the correction control circuit in parallel. Needless to say, the number of detected data may be increased.

<Third Embodiment of Display Device>
Next, a third embodiment of a display device to which the display driving device according to the present invention can be applied will be described with reference to the drawings.
FIG. 9 is a schematic configuration diagram illustrating a first main configuration example of a display device to which the display driving device according to the third embodiment is applied, and FIG. 10 illustrates the display driving device according to the third embodiment. It is a schematic block diagram which shows the 2nd example of a principal part structure of the applied display apparatus. Here, about the structure equivalent to 1st or 2nd embodiment mentioned above, the same code | symbol is attached | subjected and the description is simplified or abbreviate | omitted.

In the first and second embodiments described above, the configuration in which the luminance detection circuits NFA and NFB are provided for each display pixel constituting the display panels 110A and 110B has been described. Each DL or each scanning line SL has a common luminance detection circuit (photodiode PD).
That is, the first configuration example of the display panel and the correction control circuit applied to the present embodiment includes an organic EL element OEL and a display pixel two-dimensionally arranged on the display panel 110C as shown in FIG. Only the pixel driving circuit DCA for supplying a predetermined light emission driving current to the organic EL element OEL is provided, and each of the data lines DL provided in the display panel 110C is provided with a unique luminance detection circuit NFC. (Photodiode PD), the light emitted from the organic EL elements OEL of the display pixels in each column is detected by the photodiode PD provided in the column, and detection data corresponding to the emission luminance is obtained. It is configured to detect and capture the correction control circuit 140C via the detection line FL.

  Specifically, as shown in FIG. 9, the luminance detection circuit NFC provided for each column has the same configuration as the luminance detection circuit NFA in the first embodiment, and the light emission luminance of the organic EL element OEL is increased. Detect, a photodiode PD having one end connected to the power supply line VL and the other end connected to the contact N31, a resistor Rp having one end connected to the contact N31 and the other end connected to the ground potential, and a gate terminal An n-channel thin film transistor Tr33 connected to the reset signal line VR, having a source terminal and a drain terminal connected to the contact N31 and the ground potential, a gate terminal connected to the contact N31, and a source terminal connected to the power supply line VL, respectively. An n-channel thin film transistor Tr31, a gate terminal on the data line SL, and a source terminal and a drain terminal on the thin film transistor It has a thin film transistor Tr32 of each connected n-channel type, the configuration with the drain terminal and the detection line FL of r31.

  In the drive control method (specific amount detection operation) in the display device having such a configuration, the scan signal Vscan is applied to the scan line SL in a specific row, as in the first embodiment (see FIG. 4). Then, the display pixel group connected to the scanning line SL is set to the selected state, and the gradation signal voltage Vdata corresponding to the predetermined luminance detection data is applied to each data line DL in synchronization with the selected state. Only the display pixels in a specific column (that is, the organic EL elements OEL of the display pixels that are the luminance detection targets) are caused to emit light at, for example, the highest gradation level. Here, since the gradation signal voltage (Vgnd) corresponding to the lowest gradation level is applied to the display pixels other than the display pixels that are the luminance detection targets, the non-light emitting state is maintained.

  At this time, the gradation signal voltage Vdata applied to the display pixel as the luminance detection target is a luminance detection circuit NFC (thin film transistor Tr32) provided corresponding to each data line DL via the data line DL of the column. Is applied to the luminance detection circuit NFC so that the light emitted from the display pixel (organic EL element OEL) can be received. Therefore, the luminance detection circuit NFC is radiated from the display pixel as the luminance detection target. Detection data (analog signal level) corresponding to the light of the highest gradation level (light emission luminance of the organic EL element OEL) is output from the photodiode PD, and the correction control circuit via the detection line FL arranged for each column. 140C is converted into digital gradation data and stored in the storage unit BM.

  Here, the light emitted from each display pixel (organic EL element OEL) constituting the display panel 110C is uniform scattered light, and is formed on the panel substrate and the substrate in addition to components emitted to the outside. In addition, there is a component guided in the thin film layer. The guided light is received by the photodiode PD of the luminance detection circuit NFC. In this case, it is known that the intensity of guided light generally attenuates in proportion to the logarithm of the waveguide length of the light. Therefore, based on this relationship, the absolute value of the light emission luminance in the display pixel is obtained by taking into account the distance from the display pixel (organic EL element OEL) to be subjected to luminance detection to the luminance detection circuit NFC (photodiode PD). The digital gradation data corresponding to the absolute value may be stored in a predetermined storage area of the storage unit BM.

Similarly, the display pixels of each column set in the selected state are subjected to a light emission operation at a predetermined gradation level (maximum gradation display), and the light emission luminance of the organic EL element OEL for each display pixel is By detecting the luminance detection circuit NFC (photodiode PD) provided for each column (data line DL), and sequentially and repeatedly executing a specific amount detection operation that is taken into the correction control circuit 140C and held in the storage unit BM, A specific amount related to light emission characteristics in each display pixel (organic EL element OEL) in a specific row is acquired and held.
Then, by repeating such a specific amount detection operation for each row for each display pixel (organic EL element OEL) of another row, all the display pixels (organic EL element OEL) constituting the display panel 110C are also executed. ) Can be acquired as digital gradation data.

  Next, the digital gradation data for each display pixel stored in the storage unit BM is compared with the digital gradation data based on the initial emission luminance of each display pixel stored in advance to generate a correction value. Then, corrective action is performed. Here, as the digital gradation data based on the initial light emission luminance of each display pixel, digital gradation data based on the initial light emission luminance of each display pixel detected by the luminance detection circuit NFC can be used. In this case, since the detected digital gradation data and the initial digital gradation data have the same distance from each display pixel to the luminance detection circuit NFC, both data can be directly compared. The generation of the correction value is performed in consideration of the difference in attenuation of light intensity depending on the distance from the display pixel to the luminance detection circuit NFC as described above.

  Further, as shown in FIG. 10, the second configuration example of the display panel and the correction control circuit applied to the present embodiment includes an organic EL element OEL and a display pixel two-dimensionally arranged on the display panel 110D. Only the pixel driving circuit DCA for supplying a predetermined light emission driving current to the organic EL element OEL is provided, and each of the scanning lines SL provided in the display panel 110D has a unique luminance detection circuit NFD at one end. (Photodiode PD) is provided, and light emitted from the organic EL elements OEL of the display pixels in each row is detected by the photodiode PD provided in the row and detection data corresponding to the emission luminance is detected. In addition, the correction control circuit 140D is configured to take in the detection line FL.

  Specifically, as shown in FIG. 10, the luminance detection circuit NFD provided for each row has the same configuration as the luminance detection circuit NFC in the third embodiment (see FIG. 9), and the organic EL element OEL. A photodiode PD having one end connected to the power supply line VL and the other end connected to the contact N41, and a resistor Rp having one end connected to the contact N41 and the other end connected to the ground potential. , An n-channel thin film transistor Tr43 having a gate terminal connected to the reset signal line VR, a source terminal and a drain terminal connected to the contact N41 and the ground potential, a gate terminal connected to the contact N41, and a source terminal connected to the power supply line VL. Each connected n-channel type thin film transistor Tr41, the gate terminal to the scanning line SL, and the source terminal and drain terminal to the thin film With each connected n-channel thin film transistor Tr42 has a drain terminal and the detection line FL of transistor Tr41, and a configuration with a.

  The drive control method (specific amount detection operation) in the display device having such a configuration applies the scan signal Vscan to the scan line SL of a specific row, as in the third embodiment (see FIG. 9). Thus, the display pixel group connected to the scanning line SL is set to the selected state, and the luminance detection circuit NFD provided at the end of the scanning line SL is set to the detection standby state, and is synchronized with the selected state. Then, only the display pixels in a specific column (that is, the organic EL elements of the display pixels targeted for luminance detection) are caused to emit light at, for example, the highest gradation level, so that the luminance detection circuit NFD (photodiode PD) The light emitted from the display pixel (organic EL element OEL) is received, and detection data corresponding to the light emission luminance of the organic EL element OEL is received via the detection line FL through the correction control circuit 1. Output to 40D. Thereby, the correction control circuit 140D converts the detection data into digital gradation data and stores it in a predetermined storage area of the storage unit BM.

  Such a specific amount detection operation for each display pixel is performed for the display pixels in each column set in the selected state, and for each display pixel (organic EL element OEL) in another row constituting the display panel 110D. Also, by repeatedly executing, a specific amount related to the light emission characteristics in all the display pixels (organic EL elements OEL) constituting the display panel 110D can be acquired as digital gradation data.

  Therefore, according to the display device and the drive control method thereof according to the present embodiment, the light is emitted from the display pixel connected to the line for each data line arranged in the display panel or for each scanning line. Circuit element that has a luminance detection circuit (photodiode) that detects the emission luminance by receiving light emitted from the display device, compared with the configuration in which the luminance detection circuit is provided for each display pixel. The circuit configuration can be simplified by greatly reducing the number, and the control of the luminance detection circuit related to the specific amount detection operation can be simplified. Further, since it is not necessary to provide a luminance detection circuit for each display pixel, the effective area of the organic EL element occupying the display pixel can be relatively enlarged, so that the emission luminance is improved and the display image quality is further improved. Can be planned.

  In the present embodiment, the configuration in which the luminance detection circuit is provided at the end of each data line or each scanning line arranged on the display panel is shown, but the present invention is not limited to this. Instead, a luminance detection circuit (at least a photodiode) is located at an arbitrary position of each data line or each scanning line, specifically, an arbitrary position in the middle of the display panel and between display pixels. It is also possible to apply a configuration provided with. Even in such a configuration, it is possible to simplify the circuit configuration and simplify the control of the luminance detection circuit, and to increase the emission area by increasing the effective area of the organic EL element in each display pixel. Can do.

  Further, in each of the above-described embodiments, the case where the light emission luminance in each display pixel is detected by the luminance detection data having a single gradation level (maximum gradation level) has been described as the specific amount detection operation. The present invention is not limited to this. For example, by supplying luminance detection data corresponding to a plurality of gradation levels, the organic EL element OEL of each display pixel is caused to emit light at different luminance gradations. The brightness in each light emitting state (luminance gradation) is detected, and a plurality of detection data under a plurality of gradation conditions are obtained for each display pixel (organic EL element) and held in the correction control circuit (storage unit). You may do it. As a result, in the above-described data correction operation, the light emission characteristics of the display pixel (organic EL element) are specified by the display data regardless of the temporal changes and variations in the element characteristics of the thin film transistors and organic EL elements constituting the pixel drive circuit. The relationship of the light emission luminance of the organic EL element (light emitting element) with respect to the luminance gradation can always be maintained in a state close to the initial state, and the image information can be displayed with good and stable image quality over a long period of time.

1 is a block diagram showing a first embodiment of an overall configuration of a display device to which a display driving device according to the present invention is applied. It is a schematic block diagram which shows the principal part structural example of the display apparatus which concerns on this embodiment. It is a block diagram which shows the principal part structural example of the data driver applied to the display apparatus which concerns on this embodiment. It is a timing chart which shows an example of specific quantity detection operation applied to the drive control method of a display concerning this embodiment. It is a flowchart which shows an example of the drive control operation | movement concerning the specific amount detection operation | movement which concerns on this embodiment. 6 is a timing chart illustrating an example of an image display operation applied to the display device drive control method according to the embodiment. It is a schematic block diagram which shows the principal part structural example of the display apparatus to which the display drive device which concerns on 2nd Embodiment is applied. It is a timing chart which shows an example of specific quantity detection operation applied to the drive control method of a display concerning this embodiment. It is a schematic block diagram which shows the 1st example of a principal part structure of the display apparatus to which the display drive device which concerns on 3rd Embodiment is applied. It is a schematic block diagram which shows the 2nd example of a principal part structure of the display apparatus to which the display drive device which concerns on 3rd Embodiment is applied. It is an equivalent circuit diagram which shows the structural example of each display pixel of the light emitting element type display provided with the organic EL element in a prior art.

Explanation of symbols

100A display device 110A to 110D display panel 120 gate driver 130 data driver 140A to 140D correction control circuit 150 system controller DCA pixel drive circuit OEL organic EL element NFA to NFD luminance detection circuit ADC A / D converter BM storage unit CMR comparison correction unit

Claims (24)

By selecting a plurality of display pixels arranged two-dimensionally on the display panel for each row and applying a signal voltage corresponding to the display signal, the display pixel is caused to emit light with a luminance gradation corresponding to the display signal. In the display driving device,
Provided at least for the plurality of display pixels for each row or column of the display panel and detecting a specific amount related to the light emission characteristics of each of the plurality of display pixels when a specific signal voltage is applied. Specific amount detection means;
Storage means for holding gradation data based on at least the detected specific amount;
Based on the comparison result between the gradation data held in the storage means and the gradation data based on the initial value of the specific amount corresponding to the specific signal voltage in the display pixel, the display signal and the specific amount Signal correction means for generating a correction signal for correcting the voltage value of the signal voltage applied to the display pixel so that the relationship between
A display drive device comprising a correction control circuit comprising: The display drive device according to claim 1, wherein the storage unit further holds gradation data based on the initial value of the specific amount in the display pixel. The detection of the specific amount by the specific amount detection means is performed at least at a timing when the power to the display panel is turned on and after a predetermined time or more after the power is turned on to the display panel. The display driving apparatus according to claim 1, wherein: The display drive according to claim 1, wherein the specific amount detection unit includes a light receiving element that measures light emission luminance in the display pixel when the specific signal voltage is applied to the display pixel. apparatus. The display signal consists of digital data,
5. The display driving device according to claim 4, wherein the specific amount detection unit includes a conversion unit that converts the signal level of the specific amount output from the light receiving element into digital data and generates the gradation data. . The display driving apparatus according to claim 4, wherein the specific amount detection unit is individually arranged so that the light receiving element corresponds to each of the display pixels. 7. The specific amount detection unit includes a single input system that sequentially takes in the specific amount output from each of the light receiving elements in time series. Display drive device. The display according to any one of claims 4 to 6, wherein the specific amount detecting means includes a plurality of input systems that simultaneously take in the specific amounts output from the light receiving elements in parallel. Drive device. A plurality of scanning lines arranged extending in the row direction and a display panel in which a plurality of display pixels are arranged at each intersection of the data lines arranged extending in the column direction;
A scanning drive circuit for sequentially applying a scanning signal to the display pixels for each row of the display panel at a predetermined timing to set the selected state;
A signal driving circuit for generating a signal voltage corresponding to a display signal for displaying desired image information and applying the signal voltage to the display pixels in the row set in the selected state;
A correction control circuit for correcting the signal voltage applied to the display pixel according to the light emission characteristics of each of the display pixels;
With
The correction control circuit includes:
Specific amount detection means for detecting a specific amount related to the light emission characteristics of the display pixel when a specific signal voltage is applied to each of the display pixels by the signal driving circuit;
Storage means for holding gradation data based on at least the detected specific amount;
Based on the comparison result between the gradation data held in the storage means and the gradation data based on the initial value of the specific amount corresponding to the specific signal voltage in the display pixel, the display signal and the specific amount The correction signal for correcting the display signal supplied to the signal driving circuit is generated and the signal voltage applied to each display pixel is corrected so that the relationship between the display pixel and the display pixel approaches the relationship in the initial state of the display pixel. Signal correction means for
A display device comprising: The display device according to claim 9, wherein the storage unit further holds gradation data based on the initial value of the specific amount in the display pixel. The detection of the specific amount by the specific amount detection means is performed at least at a timing when the power to the display panel is turned on and after a predetermined time or more after the power is turned on to the display panel. The display device according to claim 9, wherein The display pixel is at least
A selection switch for taking in the gradation signal voltage applied from the signal driving circuit by the scanning signal applied from the scanning driving circuit, and light emission driving for supplying a driving current having a current value corresponding to the gradation signal voltage A light emission driving circuit having a switch and a storage capacitor for storing a voltage component corresponding to the gradation signal voltage;
A current-controlled light-emitting element that emits light at a luminance gradation corresponding to the current value of the drive current;
The display device according to claim 9, further comprising: The specific amount detection means is provided for at least the plurality of display pixels for each scanning line or each data line of the display panel, and the plurality of the specific amount detection means are applied when the specific signal voltage is applied from the signal driving circuit. The display device according to claim 12, further comprising a light receiving element that measures light emission luminance of the light emitting element of each of the display pixels. The display signal consists of digital data,
The display device according to claim 13, wherein the specific amount detection unit includes a conversion unit that converts the signal level of the specific amount output from the light receiving element into digital data and generates the gradation data. The display device according to claim 13, wherein the specific amount detection unit is individually arranged so that the light receiving element corresponds to each of the display pixels. 16. The specific amount detection unit includes a single input system that sequentially captures the specific amount output from each of the light receiving elements in time series. Display device. The display according to any one of claims 13 to 15, wherein the specific amount detecting means includes a plurality of input systems that simultaneously take in the specific amounts output from the light receiving elements in parallel. apparatus. A display device for displaying desired image information on the display panel by sequentially selecting the display pixels for each row of a display panel including a plurality of display pixels arranged two-dimensionally and applying a signal voltage according to a display signal In the drive control method,
Applying a specific signal voltage to each of the display pixels;
Detecting a specific amount related to a light emission characteristic of the display pixel;
Holding gradation data based on the detected specific amount;
Based on a comparison result between the held gradation data and gradation data based on the initial value of the specific amount corresponding to the specific signal voltage in the display pixel, the relationship between the display signal and the specific amount Correcting the voltage value of the signal voltage applied to the display pixel so as to approximate the relationship in the initial state of the display pixel;
A drive control method for a display device, comprising: The display pixel passes a drive current having a current value corresponding to the gradation signal voltage, and accumulates a voltage component corresponding to the gradation signal voltage, and corresponds to the current value of the drive current. A current-controlled light emitting element that emits light at a luminance gradation, and
The step of detecting a specific amount related to the light emission characteristics of the display pixel includes light emission of the light emitting element when the specific signal voltage is applied to the light emission drive circuit provided in each of the display pixels. 19. The display device drive control method according to claim 18, wherein luminance is measured. The step of applying the specific signal voltage sequentially applies the specific signal voltage to each of the plurality of display pixels arranged in the row direction of the display panel,
The step of detecting a specific amount related to the light emission characteristic of the display pixel sequentially detects the specific amount corresponding to each of the display pixels to which the specific signal voltage is applied. Or the drive control method of the display apparatus of 19. In the step of applying the specific signal voltage, the specific signal voltage is collectively applied to each of two or more display pixels obtained by dividing the plurality of display pixels arranged in the row direction of the display panel. Applied,
The step of detecting the specific amount related to the light emission characteristic of the display pixel includes detecting the specific amount in parallel corresponding to each of the plurality of display pixels to which the specific signal voltage is applied. The display device drive control method according to claim 18 or 19. The step of detecting the specific amount is performed at least at a timing when the power to the display panel is turned on and after a predetermined time or more after the power is turned on to the display panel. Item 22. A drive control method for a display device according to Item 18 to 21. 23. The display device according to claim 19, wherein the specific signal voltage is set to a maximum gradation voltage for causing the light emitting element to emit light at a maximum luminance gradation. Drive control method. 23. The drive of a display device according to claim 19, wherein the specific signal voltage is set to a signal voltage for causing the light emitting element to emit light at a plurality of different luminance gradations. Control method.

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