KR102045981B1 - Liquid crystal display device and driving method thereof - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display and a driving method thereof. In particular, the liquid crystal display and its driving are capable of controlling a current amplification rate of a data voltage output to a data line according to temperature information detected through a temperature sensor. It is a technical task to provide a method. To this end, the liquid crystal display according to the present invention comprises: a panel in which pixels are formed at intersections of gate lines and data lines; A data driver including an output buffer for amplifying a current of a data voltage to be output to the data lines; A temperature detector for sensing a temperature; A controller for outputting a power control signal to select a magnitude of a driving voltage to be supplied to the output buffer according to the temperature detected by the temperature detector; And a power control unit generating a driving voltage corresponding to the power control signal and supplying the driving voltage to the output buffer.

Description

Liquid crystal display and its driving method {LIQUID CRYSTAL DISPLAY DEVICE AND DRIVING METHOD THEREOF}

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device capable of reducing power consumption.

With the development of various portable electronic devices such as mobile communication terminals and notebook computers, there is an increasing demand for a flat panel display device.

Among the flat panel display devices, liquid crystal display devices (Liquid Crystal Display Device) is expanding the field of application due to the advantages of mass production technology, ease of driving means, high quality and large screen implementation.

A liquid crystal display device displays an image by adjusting a light transmittance of a liquid crystal having dielectric anisotropy using an electric field.

To this end, the liquid crystal display includes a panel in which liquid crystal cells are arranged in a matrix, and a driving unit for driving the panel.

The driver includes a controller, a gate driver, a data driver, and the like.

The gate driver sequentially drives the gate lines of the panel.

The data driver converts digital image data into a data voltage and supplies the data lines to the data lines whenever the gate lines are driven.

The controller performs a function of controlling the gate driver and the data driver.

1 is a configuration diagram of an embodiment of a data driver applied to a conventional liquid crystal display.

As illustrated in FIG. 1, the data driver 30 may include a shift register 31, a latch 32, a digital-to-analog converter (DAC) 33, and an output buffer 34. .

The shift register unit 31 generates a sampling signal using data control signals SSC, SSP, etc. received from the control unit.

The latch unit 32 latches the digital image data Data sequentially received from the control unit. The latch unit 32 converts the digital image data to the digital analog converter 33 (DAC) according to the sampling signal. Simultaneously outputs the function.

The digital-analog converter 33 simultaneously converts the image data transmitted from the latch unit 32 into a positive or negative data voltage and outputs the same. That is, the digital-to-analog converter 33 converts the image data into positive or negative data voltages (data signals) using the polarity control signal POL transmitted from the controller and outputs the data voltages to the data lines. do.

The output buffer 34 transmits the data lines of the panel according to the source output enable signal SOE transmitted from the controller to the positive or negative data voltage transmitted from the digital-to-analog converter 33. Will output

At this time, the output buffer 34 amplifies the current level of the data voltage and outputs the data lines by using the high level driving voltage VDD transmitted from the power supply unit 50.

As described above, the liquid crystal display device may be used as various portable electronic products such as a mobile communication terminal and a notebook computer. In this case, the use environment of the liquid crystal display device may be variously changed.

That is, electronic products such as a television (TV) to which a liquid crystal display device is applied may also be used in an area where the temperature is high and then moved to an area where the temperature is low. It can be changed in various ways.

When the ambient temperature at which the liquid crystal display device is used is variously changed, the liquid crystal display device is normally driven at a high temperature or a normal temperature, but at a low temperature, the mobility of electrons is reduced, and thus may not be normally driven.

In order to prevent this, the conventional liquid crystal display device is set so that it can be driven normally even in a low temperature environment.

In this case, in the output buffer 34 applied to the conventional liquid crystal display device, the current amplification factor of the data voltage is set large. That is, even if the same data voltage is output to the data line, if the current amount of the data voltage is amplified so that a large amount of current flows through the data line, the image can be normally output without deterioration of image quality even in a low temperature environment.

The fact that the output buffer 34 consumes a lot of current to amplify the current of the data voltage means that the power consumption of the conventional liquid crystal display device is high.

That is, in the conventional liquid crystal display device that is set to be optimized for low temperature so that it can be driven normally even in a low temperature environment, power consumption higher than that consumed by the liquid crystal display device that is set and driven for high temperature or room temperature is consumed. have.

However, liquid crystal display devices are relatively used at high temperature or room temperature, except when the liquid crystal display device is used in a large region where low temperature is maintained throughout the year.

Therefore, in order to provide the best image quality even at a low temperature, power is unnecessarily wasted in the conventional liquid crystal display device having an output buffer which is optimized for low temperature and driven at high power consumption.

The present invention has been proposed to solve the above problems, and according to the temperature information sensed by the temperature sensor, a liquid crystal display device and a driving method thereof, which can control the current amplification rate of the data voltage output to the data line It is technical problem to provide.

According to an aspect of the present invention, there is provided a liquid crystal display device including: a panel in which pixels are formed at intersections of gate lines and data lines; A data driver including an output buffer for amplifying a current of a data voltage to be output to the data lines; A temperature detector for sensing a temperature; A controller for outputting a power control signal to select a magnitude of a driving voltage to be supplied to the output buffer according to the temperature detected by the temperature detector; And a power control unit generating a driving voltage corresponding to the power control signal and supplying the driving voltage to the output buffer.

According to an aspect of the present invention, there is provided a method of driving a liquid crystal display device, the method including: detecting a temperature; Outputting a power control signal capable of selecting a magnitude of a driving voltage to be supplied to an output buffer according to the temperature detected in the detecting step; Generating a driving voltage corresponding to the power control signal and supplying the driving voltage to the output buffer; And amplifying the current amount of the data voltage according to the driving voltage, and outputting the amplified output data voltage to the data line.

According to the present invention, the liquid crystal display device can be driven at the minimum power consumption at room temperature, and the image quality of the liquid crystal display device is not deteriorated by increasing the power consumption at low temperature.

That is, according to the present invention, the liquid crystal display is driven at a high power consumption only during a period of use at a low temperature corresponding to a very small portion of the entire use time of the liquid crystal display, and during the period of use at the remaining room temperature, low consumption is achieved. By driving the liquid crystal display with power, the power consumption of the liquid crystal display as a whole can be reduced.

1 is a configuration diagram of an embodiment of a data driver applied to a conventional liquid crystal display.
2 is a configuration diagram of an embodiment of a liquid crystal display device according to the present invention;
3 is a diagram illustrating an embodiment of a control unit applied to a liquid crystal display according to the present invention.
4 is a configuration diagram of an embodiment of a control signal generator applied to the controller shown in FIG. 3.
5 is a configuration diagram of an embodiment of a data driver applied to a liquid crystal display according to the present invention.
FIG. 6 is a diagram illustrating an embodiment of an output buffer applied to the data driver illustrated in FIG. 5.
7 is an exemplary view illustrating a state in which power control signals applied to a liquid crystal display according to the present invention are divided according to a temperature range.

Hereinafter, with reference to the accompanying drawings will be described in detail an embodiment of the present invention.

2 is a configuration diagram of an embodiment of a liquid crystal display device according to the present invention, FIG. 3 is a configuration diagram of an embodiment of a control unit applied to a liquid crystal display device according to the present invention, and FIG. 5 is a block diagram of an embodiment of a data driver applied to a liquid crystal display according to an exemplary embodiment of the present invention. FIG. 6 is an output diagram of the data driver shown in FIG. 7 is an exemplary configuration diagram of a buffer, and FIG. 7 is an exemplary diagram illustrating a state in which power control signals applied to a liquid crystal display according to the present invention are divided according to a temperature range. .

When the liquid crystal display is used at a low temperature, the liquid crystal display may not be driven normally due to the decrease of the mobility of electrons, and thus the image quality may be deteriorated.

However, liquid crystal displays are generally used at temperatures above room temperature.

Therefore, in the liquid crystal display device according to the present invention, the power consumption for allowing the liquid crystal display device to achieve an optimum image quality at room temperature is basically set, and the liquid crystal display senses the ambient temperature, and thus the temperature is preset. In the case of the deviation, the power consumption may be varied to achieve the optimum image quality at the temperature.

To this end, in the liquid crystal display according to the present invention, as shown in FIG. 2, a panel 100 in which pixels are formed at each intersection of the gate lines GL1 to GLn and the data lines DL1 to DLm. A data driver 300 including an output buffer 340 for amplifying a current of the data voltage to be output to the data lines, a temperature detector 510 for sensing a temperature, and a temperature detected by the temperature detector 510 The driving voltage corresponding to the power control signal and the control unit 400 for outputting a power control signal for selecting a magnitude of the driving voltage to be supplied to the output buffer 340 and generating the driving voltage according to the temperature are generated. It includes a power control unit 350 to supply to the output buffer 340.

The power supply unit 700 is mounted on the main board 600, and an external system 900 for transmitting input image data and timing signals to the control unit is mounted on the external system board 800. The main board 600 is connected to the panel 100 and the external system board 800 through a flexible printed circuit board (FPC).

In addition, the data driver 300, the gate driver, and the controller 400 are collectively referred to as a driver 500. The temperature detector 510 may be mounted on the main board 600, but may be formed on the driver 500 as shown in FIG. 2.

First, the lower glass substrate of the panel 100 includes a plurality of data lines DL1 through DLm, a plurality of gate lines GL1 through GLn intersecting the data lines, and intersections of the data lines with the gate lines. A plurality of TFTs (Thin Film Transistor) formed on the substrate, a plurality of pixel electrodes (pixel electrodes) for charging the data voltage to the pixel and a touch electrode for driving the liquid crystal filled in the liquid crystal layer is formed together with the pixel electrode, The pixels are arranged in a matrix by the intersection structure of the data lines and the gate lines.

A black matrix BM and a color filter are formed on the upper glass substrate of the panel 100.

Liquid crystal is filled between the lower glass substrate and the upper glass substrate.

The liquid crystal mode of the panel 100 applied to the present invention may be any kind of liquid crystal mode as well as a TN mode, a VA mode, an IPS mode, and an FFS mode. In addition, the liquid crystal display according to the present invention may be implemented in any form, such as a transmissive liquid crystal display, a transflective liquid crystal display, a reflective liquid crystal display.

Next, the driver 500 may include a gate driver 200 for controlling signals input to a gate line formed in the panel 100 and signals input to a data line formed in the panel 100. The control unit 400 may be configured to control the data driver 300 to control the gate driver and the data driver. In addition, the driver 500 may also include the temperature detector 510.

As illustrated in FIG. 2, the gate driver 200, the data driver 300, and the controller 400 constituting the driver 500 may be configured as one integrated circuit (IC), but may be individually. It may be configured as.

That is, in a small terminal such as a smartphone or a tablet PC, the gate driver 200, the data driver 300, the controller 400 and the temperature detector 510 may be formed of one data drive IC. However, in a large terminal such as a television, the gate driver 200, the data driver 300, the controller 400, and the temperature detector 510 may be configured as individual components.

The functions of the gate driver 200, the data driver 300, the controller 400, and the temperature detector 510 constituting the driver 500 will be described below.

First, the gate driver 200 shifts a gate start pulse (GSP) transmitted from the controller 400 according to a gate shift clock (GSC), and sequentially gates on a gate line. The scan signal having the voltage Von is supplied.

Second, the data driver 300 converts the digital image data transmitted from the controller 400 into a data voltage and converts the data voltage corresponding to one horizontal line into every one horizontal period during which a scan signal is supplied to the gate line. Supply to the data lines.

That is, the data driver 300 converts the image data into the data voltage using the gamma voltages supplied from the gamma voltage generator (not shown) and outputs the image data to the data line. To this end, the data driver 300, as shown in FIG. 5, includes a shift register 310, a latch 320, a digital-to-analog converter (DAC) 330, and an output buffer 340. Doing.

The shift register unit 310 outputs a sampling signal using data control signals SSC, SSP, etc. received from the control unit 400.

The latch unit 320 latches the digital image data Data sequentially received from the controller 400, and simultaneously outputs the digital image data to the digital-to-analog converter (DAC) 330.

The digital-to-analog converter 330 simultaneously converts the image data transmitted from the latch unit into a positive or negative data voltage and outputs the data voltage. That is, the digital analog converter 330 converts the image data into a positive or negative data voltage (data signal) using the polarity control signal POL transmitted from the controller 400 to the data line. Output to

The digital-to-analog converter 330 converts the image data into the data voltage using a high level driving voltage VDD.

The output buffer 340 transmits the positive or negative data voltage transmitted from the digital-to-analog converter 330 according to the source output enable signal SOE transmitted from the control unit 400. Output to data lines DL. In particular, the output buffer 340 amplifies the amount of current of the data voltage transmitted from the digital-to-analog converter 330 according to the driving voltage transmitted from the power control unit 350 to convert the amplified output data voltage. Outputs the data line.

To this end, the output buffer 3400, as shown in Figure 6, may include a storage 341, the current amplifier 342 and the output buffer block 343.

The storage 341 stores information necessary for amplifying the data voltage transmitted from the digital-to-analog converter 330.

The current amplifier 342 amplifies the amount of current of the data voltage transmitted from the digital-to-analog converter 330 by using the driving voltage transmitted from the power control unit 350 and the information stored in the storage unit. Let's do it. That is, the current amplifier 342 amplifies the current amount of the data voltage by using the resistance value stored in the storage 341 and the driving voltage.

The output buffer block 343 outputs an output data voltage amplified by the current amplifier to each data line.

That is, when high power is supplied from the power controller 350, the output buffer 340 greatly amplifies the current amount of the data voltage, and when the low power is supplied from the power controller 350, the data voltage. Amplify the amount of current small.

According to the amount of current, the power of the output data voltage output to the data line is increased or decreased.

When the ambient temperature of the liquid crystal display is lowered, the current amount of the output data voltage is increased to increase the power of the output data voltage. In this case, the function of the liquid crystal display reduced by the temperature decrease is canceled by the increased power, so that the image quality of the image output to the panel 100 is not deteriorated.

On the other hand, when the ambient temperature of the liquid crystal display device is within the temperature range set to room temperature, the amount of current of the output data voltage is reduced, thereby reducing the power of the output data voltage.

However, since the current amount of the output day voltage is reduced so that the liquid crystal display device is set to output an optimal image in a state in which the power of the output data voltage is reduced, the liquid crystal display device is reduced even if the power of the output data voltage is reduced. The image quality of the image output to the panel 100 is not deteriorated.

Third, the controller 400 uses the timing signal input from the external system 900, that is, the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, and the data enable signal DE. The gate control signal GCS for controlling the operation timing of the gate drivers 200 and the data control signal DCS for controlling the operation timing of the data drivers 300 are generated and transmitted to the data driver 300. Create image data to be. To this end, the controller 400 may include a receiver 410 for receiving input image data and timing signals from the external system 900, and a control signal generator 420 for generating various control signals. And a data alignment unit 430 for rearranging the input image data and outputting the rearranged image data, and an output unit 440 for outputting the control signals and the image data.

That is, the controller 400 aligns the input image data input from the external system 900 according to the structure and characteristics of the panel 100 and arranges the aligned image data in the data driver ( 300).

To this end, the data aligning unit 430 may be formed in the control unit.

In addition, the controller 400 uses the timing signals transmitted from the external system, that is, the vertical synchronization signal Vsync, the horizontal synchronization signal Hsync, and the data enable signal DE. A data control signal DCS for controlling and a gate control signal GCS for controlling the gate driver are generated to transmit the control signals to the data driver and the gate driver.

To this end, the control unit 400, a control signal generator 420 may be formed.

The gate control signals GCS generated by the control signal generator 420 include a gate start pulse GSP, a gate shift clock GSC, a gate output enable signal GOE, a gate start signal VST, and a gate clock. (GCLK) and the like.

The data control signals generated by the control signal generator include a source start pulse SSP, a source shift clock signal SSC, a source output enable signal SOE, a polarity control signal POL, and the like.

In addition, the control unit 400, the receiving unit 410 is formed to receive the input image data and the timing signals from the external system 900. The receiver 410 may be configured using an interface such as low voltage differential signaling (LVDS).

Meanwhile, the controller 400 may perform a function of outputting a power control signal to select the magnitude of the driving voltage to be supplied to the output buffer 340 according to the temperature detected by the temperature detector 510. Can be.

In particular, the power control signal may be generated by the control signal generator 420. To this end, the control signal generation unit 420, as shown in Figure 4, in the storage unit 422, which stores two or more power control signals that can be selected according to the temperature, in the temperature detection unit 510 An extractor 421 for extracting a power control signal matched to the detected temperature from the reservoir 422 and a control signal generator for transmitting the power control signal transmitted from the extractor 421 to the power control unit 350. 423 may include.

However, the control signal generator 420 described above may not be formed in the controller 400. That is, when the controller 400, the gate driver 200, and the data driver 300 are formed in the driver 500 including one IC, the control signal generator ( The 420 may be formed in various shapes in the driving part 500. In this case, the control signal generator 420 formed in the controller to generate the gate control signal and the data control signal and the control signal generator 420 for generating the power control signal are independent of each other. Can be formed.

Meanwhile, as shown in FIG. 7, the power control signal is matched with the storage 422 for each temperature range. For example, when the temperature included in the range of 20 ° C ~ 30 ° C is room temperature, the room temperature power control signal may be set for the room temperature, the high temperature power control signal may be set for the temperature higher than the room temperature. The low temperature power control signal may be set for a temperature lower than the room temperature.

In this case, the low temperature power control signal may be further subdivided according to the temperature range. In FIG. 7, a temperature lower than the room temperature is divided into four stages, and for each stage, a first low temperature power control signal, a second low temperature power control signal, a third low temperature power control signal, and a fourth low temperature power control signal are included. It is set. The above-mentioned division of temperature and the number of power control signals may be variously set according to the temperature at which the liquid crystal display device and the liquid crystal display device are mainly used.

The power control signal PCS generated by the control signal generator 420 is transmitted to the power controller 350 through the output unit 440.

Meanwhile, the controller 400 sets the room temperature power control signal generated when a temperature set to room temperature among the power control signals is detected as a reference value, and outputs the room temperature power control signal. When the temperature detected by the temperature detector 510 is lower than the temperature set to the room temperature, the power control signal may be changed and output.

That is, as described above, the liquid crystal display device is often used at room temperature. Therefore, in the present invention, the control unit 400 outputs the room temperature power control signal as a default value. Accordingly, the power controller 350 generates a minimum power in accordance with the room temperature power control signal and supplies the generated power to the output buffer 340. The output buffer 340 uses the minimum power to provide the data voltage. The amount of current amplified is outputted to the data line by outputting the output data voltage whose current amount is amplified using the minimum power.

In addition, the temperature detector 510 is used to detect the ambient temperature of the liquid crystal display, and temperature sensors which are generally used may be used.

The temperature detector 510 may be mounted on the panel 100, the main board 600, and the external system board 800, but inside the driver 500 configured as an integrated circuit (IC), The controller 400, the data driver 300, and the gate driver 200 may be formed together.

Next, the power supply unit 700 uses the power supplied from the external system 900 to generate power for each of the components.

The power supply unit 700 supplies a high level driving voltage VDD to the digital-to-analog converter 330.

As shown in FIG. 5, the power control unit 350 may be formed in the data driver 300 or may be formed in the power supply 700.

When the power control unit 350 is provided in the power supply unit 700, the power control unit 350 is supplied to the output buffer 340 according to the power control signal transmitted from the control unit 400. Select the driving power to be supplied to the output buffer 340 of the data driver 300.

Next, the power control unit 350 performs a function of varying the magnitude of the driving voltage supplied to the output buffer 340. As shown in FIG. 5, the power control unit 350 may be provided in the data driver 300, but may be provided in the power supply unit 700, and may be provided in the output buffer 340. It may be.

The power control unit 350 is switched according to the power control signal PCS transmitted from the control unit to change the magnitude of the driving voltage supplied to the output buffer 340.

That is, the power control unit 350, the low temperature power control signal generated when a temperature lower than the temperature set to the normal temperature of the power control signals, when transmitted from the controller, the temperature set to the room temperature Generates power higher than the power supplied to the output buffer and supplies it to the output buffer.

Therefore, when the liquid crystal display is driven at a low temperature, the output buffer 340 greatly amplifies the current amount of the data voltage by using the high power. Therefore, as described above, the reduced function of the liquid crystal display device is canceled by the increased power as the temperature decreases, so that the image quality of the image output to the panel 100 is not degraded.

Finally, the external system 900 supplies the input image data and the timing signals to the controller 400.

The input image data is converted into digital image data by the controller 400, and finally converted to the output data voltage and output to the data line formed in the panel 100.

The timing signals are used when the controller 400 generates the gate control signal and the data control signal.

The external system 900 may be a controller of a smartphone, a mobile phone, or a tablet PC to which the display device according to the present invention is applied.

Hereinafter, the driving method of the liquid crystal display device as described above will be briefly described.

That is, the method of driving the liquid crystal display device according to the present invention corresponds to the function of the liquid crystal display device and overlaps with the above description. Therefore, in the following, the liquid crystal display driving method according to the present invention will be briefly described.

In the method of driving a liquid crystal display according to the present invention, a power control signal (PCS) capable of selecting a magnitude of a driving voltage to be supplied to the output buffer according to a first step of detecting a temperature and a temperature detected in the detection step. A second step of outputting a second voltage, a driving voltage corresponding to the power control signal PCS, a third step of supplying the driving voltage to the output buffer 340, and a current amount of the data voltage according to the driving voltage And a fourth step of outputting the amplified output data voltage to the data line.

The second step of outputting the power control signal may include storing two or more power control signals that may be selected according to temperature, and among the stored power control signals, And extracting a matched power control signal and transmitting the extracted power control signal to the power control unit 350 generating the driving voltage.

Further, in the third step of generating the driving voltage and supplying it to the output buffer, when a low temperature power control signal generated when a temperature lower than a temperature set to room temperature is detected among the power control signals, The power control unit 350 generates a higher power than the power supplied to the output buffer 340 at the temperature set to room temperature, and supplies the power to the output buffer 350.

The outputting of the output data voltage to the data line may include outputting a sampling signal, latching image data, and simultaneously outputting the image data according to the sampling signal. Converting and outputting image data into the data voltage and amplifying the current amount of the data voltage according to the driving voltage to output the amplified output data voltage to the data line.

In the outputting of the power control signal, the control unit sets the room temperature power control signal generated when a temperature set to room temperature among the power control signals is detected as a reference value, and sets the room temperature power control signal. In the outputting state, when the temperature detected in the detecting step is lower than the temperature set to the room temperature, by changing the power control signal and outputting the same, the liquid crystal display device can be driven using the minimum power consumption at room temperature. have.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. Therefore, it is to be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

100 panel 200 gate driver
300: data driver 400: controller
500: drive unit 510: temperature detector
700: power supply unit 350: power control unit

Claims (10)

A panel in which pixels are formed at intersections of the gate lines and the data lines;
A data driver including an output buffer for varying an amount of current of an output data voltage output to the data lines;
A temperature detector for sensing a temperature;
A controller for outputting a power control signal to select a magnitude of a driving voltage to be supplied to the output buffer according to the temperature detected by the temperature detector; And
A power control unit generating a driving voltage corresponding to the power control signal and supplying the driving voltage to the output buffer;
The controller controls the temperature detected by the temperature detection unit in a state in which the normal temperature power control signal generated when a temperature set to room temperature is detected among the power control signals as a reference value, and the normal temperature power control signal is output. When is lower than the temperature set to the room temperature outputs a low temperature power control signal,
The current amount of the output data voltage by the room temperature power control signal is set lower than the current amount of the output data voltage by the low temperature power control signal,
The data driver,
A shift register unit configured to output a sampling signal using data control signals received from the control unit;
A latch unit for latching image data sequentially received from the control unit and simultaneously outputting the image data according to the sampling signal;
A digital analog converter converting the image data transmitted from the latch unit into a data voltage and outputting the converted data voltage; And
And an output buffer for amplifying an amount of current of the data voltage transmitted from the digital analog converter according to the driving voltage transmitted from the power controller, and outputting the amplified output data voltage to the data line.
The output buffer,
A storage unit for storing information necessary for amplifying the data voltage transmitted from the digital analog converter;
A current amplifier for amplifying the current amount of the data voltage transmitted from the digital-to-analog converter by using the driving voltage transmitted from the power control unit and information stored in the storage unit; And
An output buffer block for outputting the output data voltage amplified in the current amplifier to each data line,
And the current amplifier amplifies the current amount of the data voltage by using the resistance value stored in the storage unit and the driving voltage. The method of claim 1,
The control unit,
A storage unit storing two or more power control signals that can be selected according to the temperature;
An extractor for extracting a power control signal matching the temperature detected by the temperature detector from the reservoir; And
And a control signal generator for transmitting the power control signal transmitted from the extractor to the power control unit. The method of claim 1,
The power control unit,
Among the power control signals, a low temperature power control signal generated when a temperature lower than a temperature set to room temperature is detected is higher than the power supplied to the output buffer at the temperature set to the room temperature when the low temperature power control signal is transmitted from the controller. And generating power and supplying the power to the output buffer. delete delete Detecting a temperature;
Outputting a power control signal capable of selecting a magnitude of a driving voltage to be supplied to an output buffer according to the temperature detected in the detecting step;
Generating a driving voltage corresponding to the power control signal and supplying the driving voltage to the output buffer; And
Amplifying the current amount of the data voltage according to the driving voltage, and outputting the amplified output data voltage to the data line;
The outputting of the power control signal may include: setting a room temperature power control signal generated when a temperature set to room temperature is detected as a reference value among the power control signals, and outputting the room temperature power control signal. If the temperature detected by the detection unit is lower than the temperature set to the room temperature, output a low temperature power control signal,
The current amount of the output data voltage by the room temperature power control signal is set lower than the current amount of the output data voltage by the low temperature power control signal,
The step of outputting the output data voltage to the data line,
Outputting a sampling signal;
Latching image data and simultaneously outputting the image data according to the sampling signal;
Converting the simultaneously output image data into the data voltage and outputting the converted data voltage; And
Amplifying the current amount of the data voltage according to the driving voltage, and outputting the amplified output data voltage to the data line;
Amplifying the current amount of the data voltage according to the driving voltage, and outputting the amplified output data voltage to the data line,
Storing information necessary for amplifying the data voltage;
Amplifying an amount of current of the data voltage using the driving voltage and the stored information; And
Outputting an output data voltage amplified through the amplifying step to each data line;
The amplifying the current amount of the data voltage using the driving voltage and the stored information may include: amplifying the current amount of the data voltage using the stored resistance value and the driving voltage; . The method of claim 6,
The outputting of the power control signal may include:
Storing at least two power control signals that can be selected according to the temperature;
Extracting, from the stored power control signals, a power control signal matching the temperature detected in the detecting step; And
And transmitting the extracted power control signal to a power control unit which generates the driving voltage. The method of claim 6,
Generating the driving voltage and supplying the driving voltage to the output buffer,
Among the power control signals, a low temperature power control signal generated when a temperature lower than a temperature set to room temperature is detected, and when received, generates power higher than the power supplied to the output buffer at the temperature set to the room temperature. And supplying to the output buffer. delete delete

Images