JP2002311916A - Driving method, display circuit, display device - Google Patents

Abstract

(57) [Summary] (with correction) [PROBLEMS] To reduce the electric charge charged to a signal line by a previous scan by a relatively simple method, to enhance the driving capability of a signal line driving circuit, and to increase the cost and cost. To realize a TFT type liquid crystal display device capable of displaying quality and a driving method thereof. SOLUTION: In an n-th horizontal scanning period, a signal line driving circuit outputs a + signal line driving voltage by a load signal Lp during a display time Tde, and a + precharge voltage by a precharge signal Ocn during a precharge time Tdo. The scanning line driving circuit outputs Von to the scanning line Xn during the display time Tde in synchronization with the horizontal scanning period, and outputs Voff by the display control signal Doff during the precharge time Tdo,
The polarity of the precharge voltage is controlled by the precharge signal Ocn, and corresponds to the white level of the signal line drive voltage. During the (n + 1) -th horizontal scanning period, a precharge voltage of-signal line drive voltage and-polarity is output. It is configured to repeat this scanning sequentially.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving method, a display circuit, a display device, a television receiver, an information processing device, and a program used for a display of an information device such as a video device or a computer.

[0002]

2. Description of the Related Art In a method of driving a liquid crystal panel based on AC driving, electric charges obtained by a previous scan (this electric charges are referred to as initial electric charges).
Remains on the signal line, affecting the drive circuit. Many driving methods based on AC driving have been proposed, but a driving method (referred to as line inversion driving) for applying pixel voltages having different polarities to pixels arranged on adjacent scanning lines is generally and frequently used. . On the other hand, in a liquid crystal display device of high quality display, a driving method (called dot inversion driving) in which pixel voltages having different polarities are applied to adjacent pixels is used.

A major difference is that a pulse voltage can be used as an operation reference voltage in the line inversion driving method, while a DC voltage is used in the dot inversion driving method. In both the driving methods, the initial charge affects the signal line driving. However, the dot inversion driving method requires a higher signal line driving voltage than the line inversion driving method, and thus the initial charge has a large influence.

A conventional liquid crystal display device will be described with reference to FIG. FIG. 12 is a configuration diagram of a conventional liquid crystal display device using a dot inversion driving method. Reference numeral 15 denotes a liquid crystal panel. The liquid crystal panel 15 includes a scanning line 11, a signal line 12, a pixel 13 at an intersection of the scanning line 11 and the signal line 12, and a common electrode 10.
Is arranged. The number of the scanning lines 11 and the number of the signal lines 12 are XN and YM, respectively, Xn is the n-th scanning line from the upper end of the liquid crystal panel 15, and Ym is m from the left end of the liquid crystal panel 15.
The pixel at the intersection is represented by (m, n). Although not shown, the pixel 13 is provided with a TFT and a liquid crystal cell. The driving voltage applied to the pixel 13 is called a pixel voltage.

[0005] A TFT is a thin film.
Transistor, that is, a thin film transistor, which functions as a switching element of each pixel 13. That is, when the TFT of the pixel 13 is on, the signal line driving voltage applied to the signal line 12 can be applied to the pixel 13 and the TFT of the pixel 13 can be applied.
Is off, the signal line drive voltage applied to the signal line 12 is not applied to the pixels 13. Also, T
The on / off switching of the FT is performed by a scanning pulse applied to the scanning line 11.

The scanning line driving circuit 17 sequentially outputs a scanning pulse to the scanning line 11, and the signal line driving circuit 16 applies a signal line driving voltage corresponding to an image signal to the signal line 1 in synchronization with the scanning pulse.
2 to drive the liquid crystal panel 15. The Hi level of the scanning pulse is Von and the Lo level is V
At off, Von is the gate voltage of the TFT that turns on the TFT, and Voff is the gate voltage of the TFT that turns off the TFT.

Reference numeral 18 denotes a power supply circuit, which includes Von, Voff, V
c and Vad are output. Vc is a reference voltage that determines an operating point of the liquid crystal panel 15 and is called an operation reference voltage, and is applied to the common electrode 10. Vad is a signal line drive power supply voltage, which is supplied to the signal line drive circuit 16 and the γ correction voltage generation circuit 22. Is done.

An image signal comprising a control signal such as a horizontal synchronizing signal and a clock signal and a data signal (in FIG. 12, Signal in
Is input to the control circuit 19, and the control circuit 19 outputs a control signal 21 for the signal line drive circuit and a control signal 20 for the scan line drive circuit to the signal line and the scan line drive circuit, respectively.

Reference numeral 22 denotes a gamma correction voltage generation circuit,
The correction voltage groups Vγ1 and Vγ2 are output to the signal line drive circuit 16 (one type of γ correction voltage group may be used in line inversion driving). In order to apply a pixel voltage whose polarity is inverted to an adjacent pixel, the inverted signal (not shown) of the signal line drive circuit control signal 21 and Vγ1 and Vγ2 are used in the signal line drive circuit 16.
Outputs a signal line driving voltage of + or − polarity to the signal line 12.

FIG. 13 is a timing chart of a conventional liquid crystal display device. DATA represents a data signal, Ck represents a clock of the data signal, Th represents a horizontal synchronization signal, and Lp represents a load signal. These signals are signal line drive circuit control signals 21 which are output from the control circuit 19 to image signals. Note that 1H represents one horizontal scanning period. The n scan in FIG.
It represents the n-th horizontal scanning period counted from a vertical synchronization signal (not shown), and m represents the m-th data and clock in the (n-1) -th horizontal scanning period.

The data signal is often a 6-bit to 8-bit digital signal. In the case of a digital signal, the signal line driving circuit 16 converts the data signal into a signal line driving voltage suitable for image display. A digital-analog conversion circuit (hereinafter abbreviated as an A / D converter) is used for this conversion, and the γ correction voltage is used as a reference voltage of the A / D converter.

The data signal of the nth horizontal scanning period shown in FIG. 13 is a signal of the (n-1) th horizontal scanning period. The data signal (FIG. 13) in the (n-1) th horizontal scanning period is latched by the signal line driving circuit 16,
At the timing of the rise of the load pulse Lp, A / D
After the conversion, the signal line 1 is set within the next (n-th) horizontal scanning period.
1, Von is output from the scanning line driving circuit 17 to the Xn-th scanning line in synchronism with the horizontal scanning signal (this is abbreviated as n-th scanning), and a signal line driving voltage (see FIG. VH) is applied. Ym in FIG. 13 indicates the m-th signal line Ym when displaying white or black on the entire screen.
Y ′ is the signal line driving line pressure waveform output to the signal line Ym in the Xn−1 or Xn + 1-th scanning, or is output in the n-th scanning in the next vertical scanning period. FIG. Td1 is a delay time of the signal line drive voltage, and Hi and Lo represent digital signals 1 and 0, respectively.

The liquid crystal panel includes a normally black (NB) in which the transmittance characteristic changes with respect to the driving voltage at VH, which has a substantially minimum transmittance, and a normally white (NW), which has a substantially maximum transmittance at VH. . What is full screen white (black) display?
It refers to a still image in which white (black) is displayed on the entire screen. Therefore, in the case of an NW liquid crystal panel (NB liquid crystal panel), VH and VL correspond to black (white) image display. Here, an NW liquid crystal panel is taken as an example.

Since a signal line drive voltage of VH and VL is output to the signal line every 1H, when VH is output, the voltage of the signal line is VL, and this VL generates an initial charge.

In the full-screen black display, the polarity of the pixel voltage is shown in the schematic diagram of FIG. 1V is a vertical scanning period. ±
Are based on the operation reference voltage Vc. The + (-) signal line driving voltage is a signal line driving voltage for generating a pixel voltage of + (-) polarity.

In an ideal case where the unbalanced voltage due to the wiring capacitance and wiring resistance of the liquid crystal panel does not overlap with the pixel voltage, Equation 1 holds.

[0017]

VH−Vc = Vc−VL∴V (+) − V (−) = 0 VH = Vc + V (+), VL = Vc−V (−) Vc that satisfies Expression 1 is called an ideal reference voltage Vr. In the actual liquid crystal panel 15, an unbalanced voltage is generated and Vc ≠ Vr. The unbalanced voltage is visually observed as flicker or display unevenness, and deteriorates image quality. For this purpose, a measure called flicker adjustment for changing the Vc to cancel the unbalanced voltage is taken. Flicker adjustment is performed by the semi-variable resistor VR of the power supply circuit 18.

In this manner, pixel voltages of opposite polarities are applied to adjacent pixels.

FIG. 15 is a schematic diagram for explaining a method of driving a conventional liquid crystal display device. An output circuit of the signal line driving circuit is represented by a power supply Vs, an output resistor Rs, and a switch SW, and the signal line 12 is represented by a capacitor Cs and a resistor Rs. Switch SW
Are turned on by the load pulse LP in synchronization with the scanning pulse.
In the full-screen black (or white in the case of the NB liquid crystal panel) display, the two-mode operation shown in FIGS.
It is repeated every time. FIG. 15 shows the initial charge Qi = V (+) *
This is a transient phenomenon in which the SW is turned on at t = 0 in the capacitance Cs of Cs or V (−) * Cs. Equation (2) shows the charge amount charged to the capacitance Cs and the peak value of the charging current Is in the (A) mode and the (B) mode.

[0020]

## EQU2 ## (A) Mode Charge: Q (+) = (VH-V (-)-Vc) * Cs = 2
* Qi peak current: I (+) = (VH−V (−) − Vc) / (ry +
Rs) (B) mode Electric charge: Q (−) = (VL−V (+) − Vc) * Cs = −
From 2 * Qi Equation 2, the work of the signal line driving circuit is doubled and the peak value of Is is doubled as compared with the case where the initial charge Qi = 0. This means that a signal line driving circuit having high driving capability is required.

[0021]

In a driving method in which the polarities of adjacent pixel voltages are different from each other, the voltage output to the signal line by the previous scan becomes the initial charge, and the signal line driving circuit discharges the initial charge to discharge the predetermined charge. A signal line drive voltage must be output to the signal line. Therefore, high driving capability is required. If the driving capability of the signal line driving circuit is insufficient, image quality unevenness occurs. In particular, in the dot inversion drive, since the operation reference voltage is DC, a high signal line drive voltage is required, so that the initial charge greatly affects the signal line drive circuit. If the driving capability of the signal line driving circuit is improved, the chip size of the signal line driving IC constituting the signal line driving circuit is increased, and the cost is increased.

As the screen size increases and the number of pixels increases, a signal line drive circuit having a high speed and a high driving capability is required, so that the influence of the initial charge becomes more remarkable.

The influence of the initial charge is not only seen in the liquid crystal display device, but also in other display devices,
For example, a display device using a matrix-type display panel in which pixels have capacitive characteristics, such as a display device using an EL (electroluminescence) display panel and a display device using a display panel of a plasma display, has such an initial state. The effect of the charge is seen.

That is, when the display panel is driven by AC driving, if the capability of the signal line driving circuit is improved in order to eliminate the influence of the initial charge, there is a problem that the chip size of the IC increases and the cost increases.

The present invention has been made in view of such a conventional problem, and the initial charge of the signal line by the previous scanning is reduced to a practically negligible level by relatively simple means. It is an object of the present invention to provide a driving method, a display circuit, a display device, a television receiver, an information processing device, and a program capable of improving driving capability of a driving circuit and displaying high-quality image at low cost.

[0026]

In order to solve the above-mentioned problems, a first aspect of the present invention (corresponding to claim 1) comprises a plurality of signal lines, a plurality of scanning lines, the signal lines and the scanning lines. The signal line driving voltage is applied by driving the scanning line of a display panel having a pixel electrode for applying a signal line driving voltage to pixels, arranged in a matrix at each intersection of the lines. A scanning line driving circuit that selects the pixel electrode; and a conversion circuit that converts a luminance level indicated by an input data signal into a signal line driving voltage to be applied to the selected pixel electrode, and drives the signal line. And a signal line driving circuit for applying the signal line driving voltage converted by the driving to the pixel electrode. The conversion circuit converts a predetermined luminance level determined in advance to the signal line drive voltage, and the signal line drive circuit applies the converted signal line drive voltage to the signal line, thereby This is a driving method for precharging the line.

The second invention (corresponding to claim 2)
Is a switching element formed for each of the pixel electrodes, and is either an ON state in which the pixel electrode is electrically connected to the signal line or an OFF state in which the pixel electrode is insulated from the signal line. The scanning element, the scanning line drive circuit switches from the off state to the on state via the scanning line, thereby switching the pixel electrode corresponding to the switching element that has been switched to the on state. When selecting, during the display time of the one horizontal scanning period, the signal line driving circuit outputs a signal line driving voltage corresponding to the input data signal,
The scanning line driving circuit outputs a gate-on voltage that turns on the switching element in synchronization with the signal line driving voltage, and during the blanking time of the one horizontal scanning period, the scanning line driving circuit performs The driving method according to the first aspect of the present invention, wherein a predetermined predetermined luminance level is output in synchronism with the signal line driving voltage converted by the conversion circuit to output a gate-off voltage for turning off the switching element. .

The third invention (corresponding to claim 3)
The predetermined luminance level is a black level or a white level, and the black level is a luminance level indicated by a data signal for displaying a black image,
The white level is the driving method according to the first or second aspect of the present invention, which is a luminance level indicated by a data signal for displaying a white image.

The fourth invention (corresponding to claim 4)
Is the drive method according to any one of the first to third aspects of the present invention, wherein the converted signal line drive voltage is substantially equal to an operation reference voltage that is a voltage that determines an operation point of the display panel.

The fifth invention (corresponding to claim 5)
Is a display panel having a plurality of signal lines, a plurality of scanning lines, and pixel electrodes arranged in a matrix at each intersection of the signal lines and the scanning lines, and for applying a signal line driving voltage to pixels. By driving the scanning lines, a scanning line driving circuit that selects the pixel electrode to which the signal line driving voltage is applied, and a luminance level indicated by an input data signal is applied to the selected pixel electrode. A signal line drive circuit for applying the signal line drive voltage converted by driving the signal line to the pixel electrode, at least having a conversion circuit for converting the signal line drive voltage to be applied;
During a blanking time of one horizontal scanning period, the conversion circuit converts a predetermined luminance level into the signal line drive voltage, and the signal line drive circuit converts the converted signal line drive voltage. The display circuit precharges the signal line by applying a voltage to the signal line.

The sixth invention (corresponding to claim 6)
The display panel is a switching element formed for each of the pixel electrodes, an ON state for conducting the pixel electrode and the signal line, or an OFF state for insulating the pixel electrode and the signal line. Wherein the scanning line drive circuit switches from the off state to the on state via the scanning line, thereby switching the switching element to the on state. And selecting the pixel electrode corresponding to the display time during the display time of the one horizontal scanning period.
The signal line driving circuit outputs a signal line driving voltage corresponding to the input data signal, and the scanning line driving circuit outputs a gate-on voltage for turning on the switching element in synchronization with the signal line driving voltage. In the blanking time of the one horizontal scanning period, the scanning line driving circuit switches the switching in synchronization with the signal line driving voltage obtained by converting the predetermined luminance level by the conversion circuit. The display device according to the fifth aspect of the present invention, which outputs a gate-off voltage for turning off the element.

The seventh invention (corresponding to claim 7)
The predetermined luminance level is a black level or a white level, and the black level is a luminance level indicated by a data signal for displaying a black image,
The white level is a display circuit according to the fifth or sixth aspect of the present invention, which is a luminance level indicated by a data signal for displaying a white image.

The eighth invention (corresponding to claim 8)
Is the display circuit according to any one of the fifth to seventh aspects of the present invention, wherein the converted signal line drive voltage is substantially equal to an operation reference voltage that is a voltage that determines an operation point of the display panel.

The ninth invention (corresponding to claim 9)
The signal line drive circuit has an output control circuit that outputs one of the data signal and the signal corresponding to the predetermined luminance level to the conversion circuit, the conversion circuit The display circuit according to any one of the fifth to eighth aspects of the present invention, which converts the output signal to the signal line driving voltage.

According to a tenth aspect of the present invention (corresponding to claim 10), the signal corresponding to the predetermined luminance level is obtained by converting the signal after the conversion of the predetermined luminance level. The display circuit according to the ninth aspect of the present invention, which is a signal including information indicating the polarity of the signal line driving voltage.

According to an eleventh aspect of the present invention (corresponding to claim 11), a plurality of signal lines, a plurality of scanning lines, and a matrix are arranged at each intersection of the signal lines and the scanning lines, A scan line drive circuit that selects the pixel electrode to which the signal line drive voltage is to be applied by driving the scan line of a display panel having a pixel electrode for applying a signal line drive voltage to the display panel; It has at least a preset voltage input terminal for inputting a predetermined preset voltage, converts an input data signal into a signal line drive voltage applied to the signal line, and converts the data signal by driving the signal line. A signal line drive circuit for applying the signal line drive voltage to the pixel electrode, wherein the signal line drive circuit applies the predetermined preset voltage during a blanking time of one horizontal scanning period. A display circuit for precharging the signal line by applying to the serial signal line.

A twelfth aspect of the present invention (corresponding to claim 12) is the eleventh aspect of the present invention, wherein the preset voltage input terminal receives an operation reference voltage that is a voltage that determines an operating point of the display panel. 3 is a display circuit.

A thirteenth aspect of the present invention (corresponding to claim 13) includes the display circuit according to any one of the fifth to twelfth aspects, and the display panel, wherein the display panel comprises the pixel Is a display device which is a matrix-type display panel showing capacitance.

A fourteenth aspect of the present invention (corresponding to claim 14) includes a receiving means for receiving a broadcast video signal, and a display means for displaying the video signal. A television receiver using the display device according to the thirteenth aspect of the present invention.

According to a fifteenth aspect of the present invention (corresponding to claim 15), an information processing means for processing information and a GUI for operating the processing result and / or the information processing means are provided.
Display means for displaying a screen, wherein the display means comprises:
An information processing apparatus using the display device according to the thirteenth aspect of the present invention.

According to a sixteenth aspect of the present invention (corresponding to claim 16), in the driving method according to the first aspect of the present invention, during the blanking time of one horizontal scanning period, the conversion circuit determines in advance. Converting the predetermined luminance level to the signal line drive voltage, and the signal line drive circuit precharges the signal line by applying the converted signal line drive voltage to the signal line. This is a program for causing a computer to execute all or part of the program.

For example, according to the present invention, a plurality of signal lines and scanning lines are provided so as to intersect with each other, and a T
A liquid crystal panel in which FTs are arranged in a matrix, a scanning line driving circuit and a signal line driving circuit of the liquid crystal panel, a control circuit for outputting a control signal to the scanning line and the signal line driving circuit, and a common electrode of the liquid crystal panel Operation reference voltage Vc
A driving circuit for a liquid crystal display device for displaying an image by a data signal, wherein in one horizontal scanning period including a display time and a subsequent blanking time, within the display time, The signal line driving circuit outputs a signal line driving voltage corresponding to a data signal, the scanning line driving circuit outputs a gate-on voltage of a TFT in synchronization with the signal line driving voltage, and the signal is driven within the blanking time. The line driving circuit outputs a precharge voltage Vp, and the scanning line driving circuit outputs the T
When the gate-off voltage of the FT is output and the signal line driving voltage of either the white level or the black level is Vhb, the precharge voltage Vp becomes | Vp−Vc | ≦ | Vhb.
−Vc | is satisfied, and has an effect that a driving method of a liquid crystal display device capable of improving driving capability of a signal line driving circuit and displaying a high-quality image can be realized.

Also, for example, the present invention is the invention according to the above-mentioned present invention, wherein the precharge voltage is set to a white level of a signal line driving voltage, and set to a black level of a signal line driving voltage. And the precharge voltage can be either a white level or a black level signal line drive voltage. .

Further, for example, the present invention is the invention according to the above-mentioned present invention, wherein the precharge voltage is set substantially to the operation reference voltage, and This has the effect of being able to match the reference voltage.

Also, for example, the present invention provides a liquid crystal panel in which a plurality of signal lines and scanning lines are provided so as to intersect, and TFTs are arranged in a matrix at each intersection of the signal lines and the scanning lines; A scanning line and a signal line driving circuit for driving a scanning line and a signal line; a control circuit for outputting a control signal to the scanning line and the signal line driving circuit; and a power supply for outputting an operation reference voltage to a common electrode terminal of the liquid crystal panel A liquid crystal display device comprising a circuit and displaying an image by a data signal.
One horizontal scanning period includes a display time and a subsequent blanking time. The signal line drive circuit outputs a signal line drive voltage corresponding to a data signal during the display time, and outputs a precharge voltage within the blanking time. The precharge voltage is within the same potential as either the white level or the black level signal line drive voltage based on the operation reference voltage, and the scanning line drive circuit is synchronized with the signal line drive voltage. A scanning pulse is output, and the gate-off voltage of the TFT is forcibly output within the blanking time. The driving capability of the signal line driving circuit is improved, and a low-cost, high-quality image is obtained. This has the function of realizing a liquid crystal display device capable of displaying.

Also, for example, the present invention is the invention according to the above-mentioned present invention, wherein the signal line driving circuit is composed of at least an output control circuit and an A / D converter, and the output control circuit is configured to output the data signal and The present invention is characterized in that one of the precharge signals is output to the A / D converter, and has an effect that the precharge signal can be used as an input signal of the A / D converter.

Further, for example, the present invention is the invention according to the above-mentioned invention, wherein the precharge signal is a white-level signal line driving voltage by a polarity signal having a value of 1 or 0 every horizontal scanning period. And a data signal corresponding to a black-level signal line drive voltage, wherein the precharge voltage is one of a white-level and a black-level signal line drive voltage. It has the effect of being able to.

Further, for example, the present invention is the invention according to the above-mentioned present invention, wherein the output circuit of the signal line driving circuit is constituted by at least a driving voltage selection circuit, and the driving voltage selection circuit is configured to receive a precharge signal by a precharge signal. The present invention is characterized in that the data signal and a predetermined DC voltage are selected and one of them is output to a signal line of the liquid crystal panel, and has an effect that a precharge voltage can be a DC voltage.

Also, for example, the present invention is the invention according to the above-described present invention, wherein the signal line driving voltage has a preset voltage Vdp input terminal, and outputs the preset voltage Vdp by a precharge signal. This has the effect that the precharge voltage can be set to the preset voltage Vdp.

Further, for example, the present invention is the invention according to the above-mentioned present invention, wherein the operation reference voltage is inputted to the preset voltage Vdp input terminal, and It has the effect of being able to match the voltage.

[0051]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device and a method of driving the same according to each embodiment of the present invention will be described with reference to the drawings. The same parts as those of the configuration of the conventional liquid crystal display device are denoted by the same reference numerals, and description thereof will be omitted.

(Embodiment 1) Embodiment 1 of the present invention relates to a method of driving a liquid crystal display device, which will be described with reference to FIG. 1 using a TFT liquid crystal display device as an example. FIG. 1 is a timing chart for explaining a driving method of the liquid crystal display device. FIG. 1A
, Data DATA, clock Ck, horizontal synchronization signal Th
And the load signal Lp is the same signal as in FIG. The same signal as the horizontal synchronizing signal is used as a precharge signal Ocn as a control signal for a signal line and a scanning line driving circuit. Time Tdo
Is the precharge time, and the time Tde is the display time. Ym
Is a signal line drive voltage waveform output to the mth signal line Ym when displaying white or black on the entire screen.

The signals and terms used in the horizontal scanning period 1H will be defined. Needless to say, 1H is the period of the horizontal scanning signal. The horizontal synchronization signal includes a blanking time Tbk and a display time Tde, and the blanking time is set after the display time. The data signal is transmitted during the display time, and the data signal contributing to image display is not transmitted during the blanking time. It is assumed that Tdo ≦ Tbk (FIG. 1 shows Tdo = Tbk
Is the case). In an arbitrary vertical scanning period, the n-th n horizontal scanning period is abbreviated as n scanning period or n scanning.

During the precharge time, a drive voltage (hereinafter, referred to as a precharge voltage) independent of the data signal is output from the signal line drive circuit, and Voff is output from the scan line drive circuit. In FIG. 1, Vsp corresponding to the positive polarity of the pixel voltage and Vsm corresponding to the negative polarity are the precharge voltages. Therefore, the ON time of the scanning pulse is the same as the conventional example (Xn in FIG. 13).
The time Tdo becomes shorter.

As in the conventional example, the signal line driving circuit outputs a + or-signal line driving voltage based on the inverted signal and the first and second γ correction voltage groups Vγ1 and Vγ2. Vγ1 is used for the + signal line drive voltage, and Vγ2 is used for the-signal line drive voltage.

In the n scanning, the scanning line driving circuit synchronizes with the horizontal scanning signal (precharge signal) (Th in FIG. 1).
(Fall time of (Ocn)) A scanning line drive voltage Von is output to the scanning line Xn, and the load signal Lp (L in FIG. 1)
The (p rise time) signal line driving circuit outputs a + or-signal line driving voltage. The signal line drive voltage waveform Y shown in FIG.
m indicates the case where the signal line Ym outputs the + signal line driving voltage during the display time and Vsp during the precharge time.

FIG. 1B shows the signal line driving line pressure waveform Y 'and the polarity control signal Po output in the (n-1) th or (n + 1) th scan or the nth scan in the next vertical scan period. The polarity control signal Po is a signal for controlling the polarity of the precharge voltage, and inverts the polarity every 1H, and inverts the polarity in the next vertical scanning period (indicated by 1 V in the figure). In FIG.
Hi of Po is defined as + polarity, Lo is defined as -polarity, and precharge voltages Vsp and Vsm are output for + polarity and -polarity, respectively.

FIG. 1C shows the timing of the vertical synchronizing signal Tv, the horizontal synchronizing signal Th, and the polarity control signal Po. As shown in the figure, the polarity of Po is inverted every 1H, and the polarity is inverted in the next vertical scanning period 1V (indicated by 1V in FIG. 1B).

FIG. 2 shows the timing of the scanning line driving circuit according to the first embodiment of the present invention. Doff is called a display control signal and is an inverted signal of the precharge signal Ocn. Therefore, δt is the precharge time Tdo. Doff is H
If i, the scanning line driving circuit sequentially outputs scanning pulses according to the scanning line driving circuit control signals (XDATA and Ckx shown in FIG. 2), and outputs Voff if Doff is Lo. The display control signal Doff is a signal for forcibly outputting the gate-off voltage Voff to the scanning line driving circuit. XDATA is a data signal of the scanning line driving circuit, and Ckx is a clock signal of the scanning line driving circuit.

X1 to X3 are scanning lines X1 to X1 of the present embodiment.
The scanning line driving voltages X1 'to X3' output to X3 indicate the scanning line driving voltages output to the conventional scanning lines X1 to X3. A scanning control signal Doff is added to the control signal for the scanning line driving circuit in the related art, and when Doff is Lo, Voff is output independently of scanning. Xon indicates that the scanning pulse is the driving voltage Von
(ON time). As shown, the on-time is shorter by δt than in the conventional example.

The driving method of the liquid crystal display device shown in FIG.
Similarly to FIG. 15, the driving of the signal lines for the full-screen black (or white) display is represented by the schematic diagram shown in FIG. As shown in FIG.
1) and (A2) are signal line driving of n scanning, and (B1) and (B2)
2) shows signal line driving of n + 1 (or n-1) scanning.
Since (A2) and (B2) are added compared to FIG.
Driving is divided into four modes. Equation 3 shows the charge amount and the peak current charged in each mode.

[0062]

(A1) mode charge amount Q (+1): Q (+1) = (VH−Vsm−Vc) * Cs =
Qi−Vsm * Cs Peak current Ip (+1): Ip (+1) = (VH−Vsm−Vc) /
(Ry + Rs) (A2) mode charge Q (+2): Q (+2) = (Vsp−V (+) − Vc) * Cs
= Vsp * Cs-Qi Peak current Ip (+2): Ip (+2) (VH-V (+)-Vc) /
(Ry + Rs) (B1) mode charge Q (-1): Q (-1) = (VL-Vsp-Vc) * Cs =
-Qi-Vsp * Cs Peak current P (-1): P (-1) = (VL-Vsp-Vc) /
(Ry + Rs) (B2) mode Charge Q (-2): Q (-2) = (Vsm-V (-)-Vc) * Cs
= Vsm * Cs-Qi Peak current P (-2): P (-2) = (VL-Vsp-Vc) /
(Ry + Rs) As shown in FIG. 1, when VH>Vsp>Vc>Vsm> VL,
Vsp and Vsm are set to values close to Vc. In the conventional driving method, there is no + and-precharge mode in FIG.
The signal lines are driven by the + and-drive modes. For the conventional example (FIGS. 13 and 12) and the present embodiment (FIG. 1), V
The charge amount at the time of output of H and VL is compared. At VH, from Q (+1) -Q (+) =-Qi-Vsm * Cs, | Q (+
1) | <| Q (+) |, and in VL, Q (−1) −Q (−)
| Q (-1) | <| Q (-) | from Q = Qi-Vsp * Cs. It is clear that the peak current is reduced by comparing Equations 2 and 1. As described above, according to the driving method of the embodiment of the present invention, the amount of work at the time of outputting the signal line driving voltage of the signal line driving circuit can be reduced. This means that the driving capability of the signal line driving circuit is improved. Naturally, Vsp = Vsm
In the case of = Vc, the maximum effect is exhibited, and the workload and the peak current are halved. Needless to say, the work of driving the signal line is the same as that of the conventional example. It should be noted that the above comparison is limited to the output of the signal line driving voltage based on the data signal.

The drive voltage (pixel voltage) and the γ correction voltage by the signal line drive circuit having a built-in A / D converter will be described as an example in the case of full screen black display by dot inversion drive (the liquid crystal panel is normally white). ). FIG. 4 is a schematic diagram showing the relationship between the pixel voltage and the γ correction voltage. The γ correction voltages γp1 to γp5 are the first γ correction voltage group Vγ1 (+ polarity)
And the γ correction voltages γm1 to γm5 are the first γ correction voltage group V
γ2 (-polarity). FIG. 4 shows a case where an ideal liquid crystal panel of Vc = Vr is used.

The signal line drive voltage having the practically minimum transmittance is defined as the black level, and the signal line drive voltage having the practically maximum transmittance is defined as the white level. Since it is normally white, γp1 and γm1 are the signal line drive voltage that minimizes the transmittance of the liquid crystal panel practically the black level, and γp5 and γm5 are the signal line drive voltages that maximize the transmittance of the liquid crystal panel practically At the white level. The liquid crystal display device displays an image by a signal line driving voltage within a range between a white level and a black level. The 6-bit data signal is a signal that is displayed as an image using data from 00 to 3F (2 ⁶ -1) in hexadecimal, and that divides between the white level and the black level into 64 to enable halftone display. I can say.

FIG. 5 shows an example of the relationship between the signal line drive voltage and the γ correction voltage. The broken line indicates the relationship between the γ correction voltage and the signal line drive voltage. The γ correction voltage corresponds to the data signal. As shown in FIG. 3, the black levels γp1 and γm1 correspond to the data signal 00, the white levels γp5 and γm5 correspond to the 3F data signal, and the other γ correction voltages are It is associated with a predetermined data signal for halftone display (for example, data signal 10 is associated with γp2 and γm2, and 2F is associated with γp3 and γm3). Other data signals are converted to signal line drive voltages by a relational expression between the data signal programmed in the signal line drive circuit and the γ correction voltage. The solid line shown in FIG. 5 indicates the voltage (γpn−Vr) and (Vr−γpn) (n = 1 to 5) corresponding to the γ correction voltage to indicate the relationship between the γ correction voltage and the ideal operation reference voltage Vr. Although plotted on the axis, it is symmetric with respect to Vr because of dot inversion drive.

As described above, the precharge voltage is different. Ideally, Vr (or Vc) is appropriate. Here, assuming that the signal line driving voltage of either the white level or the black level is Vhb and the precharge voltage Vp, a precharge voltage that does not cause any practical problem is Vp that satisfies Equation 4.

[0067]

| Vp−Vc | ≦ | Vhb−Vc | From Equation 4, it can be concluded that the precharge voltage is practically a white level signal line drive voltage (γp5 and γm5 in FIG. 4). . Equation 4 is expressed assuming that the precharge voltage is within the range of either the white level or the black level signal line drive voltage, based on the operation reference voltage Vc.

FIG. 4 shows that (γp5−Vc) = (Vc−γp)
5) Since ≒ 1 V and V (+) = V (−) ≒ 5 V, the charge amount charged to the signal line from Equations 2 and 3 is Q (+ 2) / Q (+) = Q (-2) /
Q (-) = 0.7, and the driving ability can be improved by 30%. Of course, the precharge voltage is ideally Vr
(Or Vc), Q (+2) / Q (+) = Q (-2) /
Q (−) = 0.5. Naturally, the delay time Td2 of the signal line drive voltage is shorter than Td1 of the conventional example.

In the present embodiment, the TFT liquid crystal display device has been described as an example. However, the present invention is not limited to the TFT liquid crystal display device, but is provided at the intersection of a signal line and a scanning line. The present invention is applied to a display device using a matrix display panel in which pixels to be displayed exhibit capacitive characteristics.

As such a capacitive matrix type display panel, there is a display panel such as a plasma display, an EL and an organic EL. Of course, the present invention is similarly applied to a display panel in which a switch such as a TFT is formed in a pixel of these display panels. Further, a display panel in which a switch such as a TFT and a signal line driving circuit and a scanning line driving circuit are integrally formed, for example, a polysilicon TFT in a liquid crystal display panel.
It is to be added that an FT liquid crystal display panel corresponds, and an organic EL in which a light emitting layer is formed on a substrate on which a polysilicon TFT is formed is applied.

(Embodiment 2) Embodiment 2 of the present invention will be described. The reference numerals are the same as in the first embodiment. FIG. 6 illustrates an example of a configuration diagram of a scan line driver IC included in a scan line driver circuit used in this embodiment. As shown in the figure, the scanning line driving circuit is composed of an input circuit, a shift register, a control circuit, and an output circuit. As shown in FIG. 6B, the output circuit has voltages Von and Voff (in FIG. ) Consisting of analog switches to select. X in FIG.
data and Ckx are a data signal and a clock of the scanning line driving circuit. When the display control signal Doff is Lo, the scanning line driving circuit forcibly outputs the gate-off voltage Voff. When the display control signal Doff is Hi, the scanning line driving circuit outputs a scanning pulse in synchronization with the signal line driving voltage.

On the other hand, as shown in FIG. 8, a TFT (not shown) for switching between the pixel 13 and the signal line 12 is provided as in the conventional technique. The detailed description of FIG. 8 will be described later. Each of the TFTs 13 shown in FIG. 8 has the same structure as that of the TFT shown in FIG.
When a scanning pulse is output, the TFT to which the scanning pulse is input via the scanning line 11 is turned on. Therefore, the pixel 13 corresponding to the TFT that has been turned on and the signal line 12 for driving the pixel 13 are electrically conductive, and a voltage such as a signal line driving voltage applied to the signal line 12 is applied to the pixel 13. Is also applied. When the gate-off voltage Voff is output, the TFT to which the gate-off voltage Voff is input via the scanning line 11 is turned off. Accordingly, the pixel 13 corresponding to the TFT that has been turned off and the signal line 12 that drives the pixel 13 are electrically insulated, and the voltage applied to the signal line, such as the signal line drive voltage and the precharge voltage, is
It is not applied to the pixel 13.

That is, during the display time of one horizontal scanning period, Von which is the gate-on voltage is output to the scanning line 11, so that the pixel 13 existing on the scanning line 11 to which Von is output and the pixel 13 The signal line 12 to be driven becomes conductive, and a signal line driving voltage based on the image data signal applied to the signal line 12 is applied to the pixel 13.

On the other hand, during the precharge time, that is, the blanking time, following the display time in this one horizontal scanning period, Voff, which is the gate-off voltage, is output to the scanning line 11, so that the scanning line 11 to which Voff is output is output. The pixel 13 existing above and the signal line 12 driving the pixel 13 are insulated, and the voltage applied to the signal line 12 is not applied to the pixel 13.

In this embodiment, the description has been given assuming that the gate-off voltage Voff is output to the scanning line 11 during the precharge time. However, there is a possibility that the flicker may increase slightly and the image quality may be deteriorated. At a time, the gate-on voltage Von may be output to the scanning line.

As described above, the scanning line driving circuit operates at the timing described with reference to FIG. The scanning line driving circuit of FIG. 6 has a configuration in which a signal terminal of Doff is added to the conventional example.

FIG. 7A shows an example of a configuration diagram of a signal line driver IC of a signal line driver circuit used in this embodiment mode. The signal line driving IC includes M output terminals and includes a latch, a shift register, a control circuit, an output control circuit, and an output circuit. The signal line driving IC used in the conventional liquid crystal display device does not include the output control circuit of the present embodiment. This signal line driving IC operates based on the timing shown in FIG. The latch, shift register and control circuit
A data signal corresponding to each signal line is output to the output control circuit by the data signal and the clock (R, G, and B in the figure indicate red, green, and blue, respectively). FIG. 7B shows j and J + 1.
FIG. 9 is a circuit diagram illustrating a configuration of a third output control circuit. The output control circuit includes an inverter, an AND and an OR circuit. The even-numbered (Oj) and odd-numbered (Oj + 1) output control circuits receive inverted polarity signals Po. Each output control circuit outputs the precharge signal Ocn and the outputs of the latch, shift register, and control circuit (in FIG. Sj, Sj + 1)
Is entered. With such a configuration, a data signal is output from each output control circuit when Ocn is Lo, and
During the period when cn is Hi, Po is applied to the even-numbered output control circuit,
The inverted Po is output to the odd-numbered output control circuit. Since Po is a binary value of Hi or LO, it corresponds to a data signal corresponding to a white level or a black level, and after the + signal line driving voltage is output, the + precharge voltage becomes
After the signal line drive voltage is output, the precharge voltage of-is output. The setting of white level or black level is Po
Can be easily changed by changing the timing at which Hi and Lo are changed.

FIG. 7C shows a configuration diagram of a j-th output circuit in the signal line driving IC. The output circuit includes an A / D converter and a buffer. A γ correction voltage is used as a reference voltage of the A / D converter. In the figure, the first and second γ correction voltage groups are used as reference voltages to support dot inversion driving. An operational amplifier is often used for the buffer.

FIG. 8 shows a configuration diagram of a liquid crystal display device according to the second embodiment of the present invention.

The signal line driving circuit 16b is composed of the signal line driving IC described with reference to FIG.
It is composed of the scanning line driving IC described in FIG. The control circuit 19b sends a display control signal Doff to the scanning line driving circuit 17b.
, And outputs a control signal 21b for the signal line drive circuit including the precharge signal Ocn and the polarity signal Po to the signal line drive circuit 16b and the signal line drive circuit 16b. The liquid crystal display device of FIG. 8 outputs a signal line driving voltage corresponding to a data signal during a display period Tdo, and a white level (black level for normally black) corresponding to the polarity of the signal line driving voltage within a blanking time. , The driving capability of the signal line driving circuit is improved, and a high-quality image can be displayed.

Further, the liquid crystal display device of the present embodiment
The precharge voltage is generated by converting the luminance level of the data signal for displaying a white image (or the luminance level of the data signal for displaying a black image) during the blanking time of one horizontal scanning period. A hardware portion that outputs a precharge voltage during a blanking time of a scanning period, and a corresponding signal line that is converted from an externally input data signal for image display during a display period of one horizontal scanning period A considerable part of a circuit, an element, and the like can be shared with a part of the hardware that outputs the drive voltage.

Therefore, even when the precharge function of the present embodiment is incorporated into a conventional liquid crystal display device, much hardware such as circuits and elements that need to be added for the precharge function is not required. The precharge function can be realized without significantly changing the circuit configuration of the liquid crystal display device. According to the liquid crystal display device of the present embodiment, low cost and relatively simple means Thus, a high-quality image display can be realized.

The A / D converter according to the present embodiment is an example of the conversion circuit according to the present invention, and the white level in the case of the normally white according to the present embodiment is a predetermined luminance according to the present invention. The black level in the case of normally black according to the present embodiment is an example of a predetermined luminance level which is predetermined according to the present invention, and the polarity signal Po according to the present embodiment is the same as the above-described polarity signal Po according to the present invention. This is an example of information indicating the polarity of the signal voltage after the conversion of the predetermined luminance level, and the liquid crystal display device of the present embodiment is an example of the display device of the present invention. The scanning line driving circuit and the signal line driving circuit of the device are examples of the display circuit of the present invention.

(Embodiment 3) Embodiment 3 of the present invention will be described. The present embodiment has a configuration in which the precharge voltage is set to a predetermined voltage close to a constant operation reference voltage in the liquid crystal display device of the second embodiment. Therefore, the polarity signal Po becomes unnecessary. FIG. 9 is a timing chart for explaining the liquid crystal display device according to the third embodiment of the present invention. FIG. 9 is a timing chart in the case where the precharge voltages Vsp and Vsm shown in FIG. 1 are made substantially equal to the operation reference voltage Vc. Others are the same as FIG. The delay time Td3 of the signal line drive voltage can be made shorter than Td2, and a high-quality image display can be performed by increasing the speed of the signal line drive circuit and improving the drive capability.

To output a precharge voltage substantially equal to the operation reference voltage Vc (or a DC voltage close to the operation reference voltage), the output circuit of the signal line drive circuit must be changed. FIG. 10 shows an example of an output circuit of a signal line driver circuit in Embodiment 3. FIG. 10 shows the j-th buffer of the output circuit. A drive voltage selection circuit 40 selects an output Sj from the A / D converter and a preset voltage Vdp based on a precharge signal Ocn and outputs the same. Op is an operational amplifier circuit and 40 buffers. 40
Is not necessary if the driving capability of the device is high. Note that 40
May be an analog switch. The configuration of the signal line driving circuit used in the third embodiment is such that the output control circuit is omitted in FIG. 7A and the output circuit is changed to the output circuit shown in FIG. 10 and the input terminal of the preset voltage Vdp is provided. The voltage can be any DC potential, and if Vdp = Vc, an almost ideal precharge voltage can be obtained.

FIG. 11 is a configuration diagram of the liquid crystal display device according to the third embodiment. In the liquid crystal display device of FIG. 8, the control circuit and the signal line drive circuit are used for controlling the signal line drive circuit that does not include the polarity signal Po. Control circuit 19 for outputting signal 20c
The configuration is changed to the signal line drive circuit 16c that outputs the signal c and the preset voltage Vdp as a precharge voltage, and operates at the timing shown in FIG. Others are the same as FIG.

The preset voltage Vd of the present embodiment
p is an example of the predetermined preset voltage of the present invention.

Note that the display circuit of the present invention is not limited to the display circuit used in the liquid crystal display device of the present embodiment,
In short, the display circuit of the present invention, such as a display circuit used for a plasma display or a display circuit used for an EL display, is used for a matrix-type display device in which pixels disposed at intersections of signal lines and scanning lines are capacitive. What is necessary is just a display circuit to be used.

Further, the display device of the present invention is not limited to the liquid crystal display device of the present embodiment, but the display device of the present invention, such as a plasma display or an EL display, is disposed at the intersection of a signal line and a scanning line. It is only necessary that the pixels to be processed be a matrix-type display device that exhibits capacitive characteristics.

Further, there is provided a receiving means for receiving a broadcast video signal, and a display means for displaying the video signal, wherein the display means is a television receiver using the display device of the present invention. Also belong to the present invention.

Further, information processing means for processing information,
Display means for displaying the processing result and / or a GUI screen for operating the information processing means, wherein the display means includes an information processing apparatus using the display device of the present invention. Belong.

The present invention relates to all or some of the steps (or steps, operations,
This is a program for causing a computer to execute the operation of the operation, etc.), and is a program that operates in cooperation with the computer.

Note that some steps of the present invention (or
Process, operation, operation, etc.) means several means or steps of the plurality of steps, or
It means a part of the operation within one step.

Further, the present invention includes a computer-readable recording medium on which the program of the present invention is recorded.

[0095] One embodiment of the program of the present invention may be a mode in which the program is recorded on a computer-readable recording medium and operates in cooperation with the computer.

[0096] One embodiment of the program of the present invention may be a mode in which the program is transmitted through a transmission medium, read by a computer, and operates in cooperation with the computer.

The data structure of the present invention includes a database, a data format, a data table, a data list, a type of data, and the like.

The recording medium includes a ROM and the like, and the transmission medium includes a transmission medium such as the Internet,
Light, radio waves, sound waves, etc. are included.

Further, the computer of the present invention described above
It is not limited to pure hardware such as a CPU, and may include firmware, an OS, and peripheral devices.

As described above, the configuration of the present invention may be realized by software or hardware.

[0101]

As is apparent from the above description, according to the present invention, the influence of the driving ability of the signal line driving circuit due to the initial charge charged by the previous scan is minimized by relatively simple means. A driving method that can improve the driving capability of the signal line driving circuit, eliminate the shortage of the driving capability of the signal line driving circuit even in the case of a liquid crystal display device having a large number of pixels and a large screen size, and display high quality image at low cost , Display circuit,
A display device, a television receiver, an information processing device, and a program can be provided.

[Brief description of the drawings]

FIG. 1 is a timing chart showing a method for driving a liquid crystal display device in Embodiment 1 of the present invention.

FIG. 2 is a diagram showing timing of a scanning line driving circuit in Embodiment 1 of the present invention.

FIG. 3 (A1) is a schematic diagram illustrating the driving of an n-scan signal line in the liquid crystal panel driving method according to the first embodiment of the present invention. (A2) The liquid crystal panel driving method according to the first embodiment of the present invention. Schematic diagram for explaining driving of n-scan signal lines (B1) Schematic diagram for explaining driving of n + 1 (or n-1) scanning signal lines in the liquid crystal panel driving method according to Embodiment 1 of the present invention (B2) FIG. 4 is a schematic diagram illustrating driving of a signal line for n + 1 (or n−1) scanning in the liquid crystal panel driving method according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram illustrating a relationship between a pixel voltage and a γ correction voltage.

FIG. 5 is a schematic diagram showing a relationship between a γ correction voltage and a signal line driving voltage.

6A is a configuration diagram illustrating an example of a scanning line driving IC of a liquid crystal display device according to a second embodiment of the present invention. FIG. 6B is an output of the scanning line driving IC of the liquid crystal display device according to the second embodiment of the present invention. Configuration diagram showing an example of a circuit

7A is a configuration diagram illustrating an example of a signal line driving IC of a liquid crystal display device according to Embodiment 2 of the present invention. FIG. 7B is a diagram illustrating j of the liquid crystal display device according to Embodiment 2 of the present invention.
(C) Configuration diagram showing an example of the (j) th output control circuit of the liquid crystal display device according to the second embodiment of the present invention.
Configuration diagram showing an example of the third output circuit

FIG. 8 is a configuration diagram of a liquid crystal display device according to Embodiment 2 of the present invention.

FIG. 9 is a timing chart illustrating a liquid crystal display device according to Embodiment 3 of the present invention.

FIG. 10 illustrates an example of an output circuit of a signal line driver circuit in Embodiment 3.

FIG. 11 is a configuration diagram of a liquid crystal display device in Embodiment 3.

FIG. 12 is a configuration diagram of a conventional liquid crystal display device.

FIG. 13 is a timing chart illustrating a driving method of a conventional liquid crystal display device.

FIG. 14 is a schematic diagram illustrating the polarity of a pixel voltage.

15A and 15B are schematic diagrams illustrating a conventional driving method. FIG. 15A is a schematic diagram illustrating one of two modes of a conventional liquid crystal display device driving method. FIG. 15B is a schematic diagram illustrating a conventional liquid crystal display driving method. Schematic diagram for explaining the other of the two modes

[Explanation of symbols]

Reference Signs List 10 common electrode terminal 11 scanning line 12 signal line 13 pixel 15 liquid crystal panel 16, 16b, 16c signal line driving circuit 17, 17b, scanning line driving circuit 18 power supply circuit 19, 19b, 19c control circuit 20, 20b For scanning line driving circuit Control signal 21, 21b, 21c Signal line drive circuit control signal 22 γ correction circuit 23 First γ correction voltage group 24 Second γ correction voltage group 40 Drive voltage selection circuit Ck Clock DATA Data signal Doff Display control signal 1H Horizontal Scan period 1V Vertical scan period Lp Load signal Ocn Precharge signal Op Operational amplifier Po Polarity signal Tdo Precharge time Tde Display time Td1, Td2, Td3 Signal line drive voltage delay time Th Horizontal synchronization signal Tv Vertical synchronization signal Vsp, Vsm Pre Charge voltage Vc Operation reference voltage Vy Signal line drive voltage source Vr Virtual operation reference voltage VH, VL Vs Signal line drive voltage V (+), V (−) Pixel voltage Vγ1 First correction voltage group Vγ2 Second correction voltage group Von Gate-on voltage of TFT Voff Gate-off voltage of TFT γp1 to γm5 + Polarity γ correction voltage γm1 to γm5 −polarity γ correction voltage Xdata Data of scan line drive circuit Xck Clock of scan line drive circuit Xn nth scan line or its drive voltage waveform Ym mth signal line or its drive voltage Waveform Y 'm-th signal line in the next vertical scanning period or its driving voltage waveform Rs Resistance of signal line Ry Output resistance of signal line driving circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G09G 3/20 641 G09G 3/20 641C H04N 5/66 102 H04N 5/66 102B F-term (Reference) 2H093 NC09 NC11 NC16 ND33 ND36 5C006 AA16 AC21 AF73 AF82 BB15 FA23 FA25 FA37 5C058 AA06 BA02 BA04 BB04 5C080 AA10 BB05 DD05 DD06 FF11 JJ02 JJ04 KK01 KK43

Claims (16)

[Claims] 1. A semiconductor device comprising: a plurality of signal lines; a plurality of scanning lines; and a pixel electrode arranged in a matrix at each intersection of the signal lines and the scanning lines for applying a signal line driving voltage to pixels. A scanning line driving circuit that selects the pixel electrode to which the signal line driving voltage is applied by driving the scanning line of the display panel; and the pixel whose luminance level indicated by the input data signal is selected. A display having at least a conversion circuit for converting the signal line drive voltage applied to the electrode to the pixel electrode, and applying the signal line drive voltage converted by driving the signal line to the pixel electrode; A driving method for driving a circuit, wherein during a blanking time in one horizontal scanning period, the conversion circuit converts a predetermined brightness level to a signal line driving voltage. The signal line driving circuit, the driving method of precharging the signal line by applying the converted the signal line drive voltage to the signal line. 2. A switching element formed for each of the pixel electrodes, wherein the switching element is in an ON state in which the pixel electrode is electrically connected to the signal line, or an OFF state in which the pixel electrode is insulated from the signal line. The switching element, which can take any of the states, corresponds to the switching element that has been switched to the on state by the scanning line driving circuit switching from the off state to the on state via the scanning line. When selecting a pixel electrode, during the display time of the one horizontal scanning period, the signal line driving circuit outputs a signal line driving voltage corresponding to the input data signal, and the scanning line driving circuit outputs the signal line driving voltage. Outputting a gate-on voltage for turning on the switching element in synchronization with a voltage; 2. The line drive circuit according to claim 1, wherein the predetermined predetermined luminance level outputs a gate-off voltage that turns off the switching element in synchronization with the signal line drive voltage converted by the conversion circuit. Drive method. 3. The predetermined luminance level is a black level or a white level. The black level is a luminance level indicated by a data signal for displaying a black image. 3. The driving method according to claim 1, wherein the level is a luminance level indicated by a data signal for displaying a white image. 4. The driving method according to claim 1, wherein the converted signal line driving voltage is substantially equal to an operation reference voltage that is a voltage that determines an operation point of the display panel. 5. A plurality of signal lines, a plurality of scanning lines, and pixel electrodes arranged in a matrix at respective intersections of the signal lines and the scanning lines, for applying a signal line driving voltage to pixels. A scan line driving circuit for selecting the pixel electrode to which the signal line drive voltage is applied by driving the scan lines of the display panel, and a luminance level indicated by an input data signal is selected. A signal line driving circuit that converts the signal line driving voltage converted by driving the signal line to the pixel electrode, the signal line driving circuit having at least a conversion circuit that converts the signal line driving voltage to be applied to the pixel electrode; During a blanking time in one horizontal scanning period, the conversion circuit converts a predetermined luminance level to the signal line drive voltage, and the signal line drive circuit Display circuit for precharging the signal line by applying a signal line driving voltage to the signal line. 6. The display panel is a switching element formed for each of the pixel electrodes, and is in an on state in which the pixel electrodes and the signal lines are electrically connected, or insulates the pixel electrodes from the signal lines. The scanning line driving circuit is switched to the on state by switching from the off state to the on state via the scanning line. The pixel line corresponding to the switching element is selected, and during the display time of the one horizontal scanning period, the signal line driving circuit outputs a signal line driving voltage corresponding to the input data signal, A scanning line driving circuit that outputs a gate-on voltage that turns on the switching element in synchronization with the signal line driving voltage; During the blanking time, the scanning line driving circuit includes a gate-off voltage that turns off the switching element in synchronization with the signal line driving voltage obtained by the conversion of the predetermined luminance level by the conversion circuit. 6. The display device according to claim 5, which outputs the following. 7. The predetermined predetermined luminance level is a black level or a white level; the black level is a luminance level indicated by a data signal for displaying a black image; 7. The display circuit according to claim 5, wherein the level is a luminance level indicated by a data signal for displaying a white image. 8. The display circuit according to claim 5, wherein the converted signal line drive voltage is substantially equal to an operation reference voltage that is a voltage that determines an operation point of the display panel. 9. The signal line drive circuit includes an output control circuit that outputs one of the data signal and a signal corresponding to the predetermined luminance level to the conversion circuit, The display circuit according to claim 5, wherein the conversion circuit converts the output signal to the signal line driving voltage. 10. The signal corresponding to the predetermined luminance level is a signal that also includes information indicating the polarity of the signal line drive voltage after the conversion of the predetermined luminance level. The display circuit according to claim 9. 11. A plurality of signal lines, a plurality of scanning lines, and pixel electrodes arranged in a matrix at respective intersections of the signal lines and the scanning lines, for applying a signal line driving voltage to pixels. A scanning line driving circuit for selecting the pixel electrode to which the signal line driving voltage is to be applied by driving the scanning lines of the display panel, and a preset voltage input terminal for inputting a predetermined preset voltage. Having at least an input data signal,
A signal line drive circuit for converting the signal line drive voltage to be applied to the signal line, and applying the converted signal line drive voltage to the pixel electrode by driving the signal line; A display circuit that precharges the signal line by applying the predetermined preset voltage to the signal line during a blanking time. 12. The display circuit according to claim 11, wherein an operation reference voltage that is a voltage that determines an operation point of the display panel is input to the preset voltage input terminal. 13. A display device, comprising: the display circuit according to claim 5; and the display panel, wherein the display panel is a matrix-type display panel in which the pixels are capacitive. 14. A television receiver, comprising: receiving means for receiving a broadcast video signal; and display means for displaying the video signal, wherein the display means uses a display device according to claim 13. apparatus. 15. An information processing means for processing information, and a display means for displaying the processing result and / or a GUI screen for operating the information processing means, wherein the display means includes: An information processing apparatus using the display device. 16. The driving method according to claim 1, wherein during a blanking time in one horizontal scanning period, the conversion circuit comprises:
The signal line driving circuit converts a predetermined luminance level determined in advance into the signal line driving voltage, and applies the converted signal line driving voltage to the signal line to precharge the signal line. A program that causes a computer to execute all or some of the steps.