CN101635133A - Liquid crystal display device and pixel driving method - Google Patents

Abstract

A pixel driving method is used for driving a liquid crystal display panel, the liquid crystal display panel is provided with a first side edge, a first pixel and a second pixel, and the distances between the first pixel and the first side edge are different from the distances between the second pixel and the first side edge. The pixel driving method comprises the following steps: converting the first signal into a first compensation signal; converting the second signal into a second compensation signal; driving a first pixel according to a first compensation signal; and driving the second pixel according to the second compensation signal, wherein when the first pixel and the second pixel operate according to the same gray scale value, the first compensation signal is substantially not equal to the second compensation signal. The invention also discloses a liquid crystal display device.

Description

Liquid crystal display device and pixel driving method

technical field

The present invention relates to a display device and a pixel driving method, in particular to a liquid crystal display device and a pixel driving method.

Background technique

With the development of flat panel display (FPD) technology, liquid crystal display has gradually replaced the traditional cathode ray tube (Cathode Ray Tube, CRT) display due to its superior characteristics such as light and thin body, low power consumption and no radiation. device, and applied to various electronic products. The liquid crystal display device mainly includes a liquid crystal display panel, a driving module and a backlight module, wherein the driving module is used to drive the liquid crystal display panel, and the conventional driving method still needs to be improved.

Referring to FIG. 1 , a conventional liquid crystal display device 1 includes a liquid crystal display panel 11 and a driving module 12 . The liquid crystal display panel 11 has a plurality of pixels, including a first pixel P ₁₁ and a second pixel P ₁₂ , the first pixel P ₁₁ is closer to the upper edge of the liquid crystal display panel 11 , and the second pixel P ₁₂ is closer to the liquid crystal display panel 11 the lower edge.

The driving module 12 has a scan driving circuit 121 , a data driving circuit 122 , a timing control circuit (timing control circuit) 123 and a gamma voltage generating unit (Gamma correction unit) 124 . The scanning driving circuit 121 is electrically connected to a plurality of scanning lines S ₁₁ -S _1M on the liquid crystal display panel 11, the data driving circuit 122 is electrically connected to a plurality of data lines D ₁₁ -D _1N on the liquid crystal display panel 11, and the pixels Located at intersections of scan lines S ₁₁ -S _1M and data lines D ₁₁ -D _1N . The gamma voltage generating unit 124 includes a voltage dividing circuit, such as a resistor string, which can provide a gamma voltage to the data driving circuit 122 as a reference voltage for voltage dividing. The gamma voltage it provides is determined based on human vision.

The timing control circuit 123 transmits the vertical clock signal and the vertical synchronous signal to the scanning driving circuit 121, and converts the video signal received from the external interface into a data signal used by the data driving circuit 122, and transmits the data signal, the horizontal clock signal and the horizontal synchronizing The signal is sent to the data driving circuit 122. The scan driving circuit 121 sequentially turns on the scan lines S ₁₁ -S _1M according to the vertical clock signal and the vertical sync signal. When the scan lines S ₁₁ -S _1M are turned on, the data driving circuit 122 divides the data signal corresponding to each row of pixels according to the gamma voltage to obtain the voltage signal for driving the pixels, and transmits the data signal through the data lines D ₁₁ -D _1N Send the voltage signal to the pixel and drive it.

Wherein, for the first pixel _P11 and the second pixel _P12 , when their data signals are the same, that is, they operate according to the same gray scale value, the first pixel _P11 and the second pixel _P12 should be driven by the same driving voltage signal driven. However, due to the resistance-capacitance delay (RC delay) effect caused by the data line _D11 , the voltages actually driving the pixels _P11 and _P12 are different. Therefore, due to the effect of resistance-capacitance delay, all pixels cannot operate accurately according to the expected gray scale value, thus causing distortion of the displayed image and reducing the display efficiency.

Therefore, how to provide a liquid crystal display device and a pixel driving method that can accurately drive pixels to avoid display image distortion and improve display efficiency is one of the current important issues.

Contents of the invention

In view of the above problems, the object of the present invention is to provide a liquid crystal display device and a pixel driving method capable of precisely driving pixels to avoid display image distortion and improve display efficiency.

To achieve the above purpose, a pixel driving method according to the present invention is used to drive a liquid crystal display panel. The liquid crystal display panel has a first side, a first pixel and a second pixel, and the distances between the first pixel and the second pixel are different from the first side. The pixel driving method includes the following steps: converting the first signal into a first compensation signal; converting the second signal into a second compensation signal; driving the first pixel according to the first compensation signal; and driving the second pixel according to the second compensation signal, Wherein when the first pixel and the second pixel operate according to the same gray scale value, the first compensation signal is not substantially equal to the second compensation signal.

To achieve the above purpose, a liquid crystal display device according to the present invention includes a liquid crystal display panel, a signal compensation unit and a driving module. The liquid crystal display panel has a first side, a first pixel and a second pixel, and the distances between the first pixel and the second pixel are different from the first side. The signal compensation unit converts the first signal and the second signal into a first compensation signal and a second compensation signal respectively. The driving module drives the first pixel according to the first compensation signal, and drives the second pixel according to the second compensation signal, and when the first pixel and the second pixel operate according to the same gray scale value, the first compensation signal is not substantially equal to the second compensation signal Signal.

To achieve the above purpose, a pixel driving method according to the present invention is used to drive a liquid crystal display panel, and the liquid crystal display panel includes a first pixel and a second pixel. The pixel driving method includes the following steps: receiving a grayscale signal to drive the first pixel and the second pixel; converting the grayscale signal into a first voltage signal according to the position of the first pixel on the liquid crystal display panel; The position on the liquid crystal display panel converts the grayscale signal into a second voltage signal, wherein the first voltage signal is not equal to the second voltage signal.

To achieve the above object, a pixel driving method according to the present invention is used to drive a liquid crystal display panel. The liquid crystal display panel has a first side, a first pixel and a second pixel, and the first pixel and the second pixel are respectively connected to the first pixel. The sides are at different distances. The pixel driving method includes the following steps: receiving a first signal corresponding to the first pixel and the second pixel; according to the position of the first pixel, correspondingly adjusting the first signal to a first compensation signal; and according to the first compensation signal and the first signal The first pixel and the second pixel are respectively driven, wherein the first compensation signal is not equal to the first signal.

Based on the above, according to a liquid crystal display device and a pixel driving method of the present invention, the signal is compensated, and pixels that operate at the same gray scale value but at different positions are driven by different compensation signals, so that The resistance-capacitance delay effect caused by the data line is compensated, so that each pixel can be accurately operated according to the gray scale value, thereby avoiding display image distortion and improving display efficiency.

Description of drawings

1 is a schematic diagram of a conventional liquid crystal display device;

2 is a schematic diagram of a liquid crystal display device according to a preferred embodiment of the present invention;

3 to 5 are block diagrams of signal compensation units with different aspects of the liquid crystal display device according to the preferred embodiment of the present invention;

6 to 8 are schematic diagrams of different applications of the signal compensation unit of the liquid crystal display device according to the preferred embodiment of the present invention; and

9A to 9C are flowcharts of a pixel driving method in a preferred embodiment of the present invention.

[Description of main component symbols]

1, 2, 3, 4, 5: Liquid crystal display device

11, 21, 51: LCD panel

12, 22, 52: drive module

121, 221, 521: scanning drive circuit

122, 222, 322, 422, 522: data drive circuit

123, 223, 523: timing control circuit

124, 224, 324, 424: Gamma voltage generation unit

211: First side

53: Signal Compensation Unit

AB ₂₁ to AB _2N , AB ₃₁ to AB _3N , AB ₄₁ to AB _4N : Analog buffer amplifiers

D ₁₁ ～D _1N , D ₂₁ ～D _2N , D ₃₁ ～D _3N , D ₄₁ ～D _4N : data line

DA: digital/analog conversion unit

DA ₂₁ ～DA _2M , DA ₃₁ ～DA _3N , DA ₄₁ ～DA _4N : digital/analog converter

F: filter unit

F ₄₁ ～F _4M : filter circuit

FL ₂₁ ～FL _2N , FL ₃₁ ～FL _3N , FL ₄₁ ～FL _4N : the first data register

G ₃₁ ～G _3M : Voltage divider circuit

Hc: Horizontal clock signal

Hs: horizontal sync signal

LS ₂₁ ～LS _2N , LS ₃₁ ～LS _3N , LS ₄₁ ～LS _4N : Potential shifters

P ₂ , P ₃ , P ₄ : Pixels

P ₁₁ , P ₂₁ , P ₃₁ , P ₄₁ : first pixel

P ₁₂ , P ₂₂ , P ₃₂ , P ₄₂ : second pixels

S11-S14, S21-S23, S31-S33: steps of the pixel driving method

S ₁₁ ～S _1M , S ₂₁ ～S _2M , S ₃₁ ～S _3M , S ₄₁ ～S _4M : scanning lines

SC ₁₁ , SC ₂₁ , SC ₃₁ : first compensation signal

S _C12 , S _C22 , S _C32 : the second compensation signal

SL ₂₁ ～SL _2N , SL ₃₁ ～SL _3N , SL ₄₁ ～SL _4N : the second data buffer

SR ₂₁ ～SR _2N , SR ₃₁ ～SR _3N , SR ₄₁ ～SR _4N : shift register

Detailed ways

A liquid crystal display device and a pixel driving method according to preferred embodiments of the present invention will be described below with reference to related drawings.

Referring to FIG. 2 , the liquid crystal display device 2 of the preferred embodiment of the present invention mainly includes a liquid crystal display panel 21 and a driving module 22 . The liquid crystal display panel 21 has a plurality of pixels, including a first pixel P ₂₁ and a second pixel P ₂₂ , the liquid crystal display panel 21 further has a first side 211 , and the first pixel P ₂₁ and the second pixel P ₂₂ are respectively connected to the first pixel P 21 . The distances of the sides 211 are different. The first side 211 of this embodiment takes the side of the liquid crystal display panel 21 close to the data drive circuit 222 of the driving module 22 as an example, the first pixel _P21 of this embodiment is closer to the first side 211, and the second pixel P ₂₂ is farther away from the first side 211 . It should be noted that the positions of the first pixel _P21 and the second pixel _P22 shown in FIG. 2 are for illustration only, and are not intended to limit the present invention.

The driving module 22 has a scan driving circuit 221 , a data driving circuit 222 , a timing control circuit 223 and a gamma voltage generating unit 224 . The scanning driving circuit 221 is electrically connected to a plurality of scanning lines S ₂₁ -S _2M on the liquid crystal display panel 21 , and the data driving circuit 222 is electrically connected to a plurality of data lines D ₂₁ -D _2N on the liquid crystal display panel 21 , and each The pixels are respectively located at the sum of the corresponding scan lines S ₂₁ -S _2M and data lines D ₂₁ -D _2N . The gamma voltage generating unit 224 includes a voltage dividing circuit, such as a resistor string connected in series, which can provide a gamma voltage to the data driving circuit 222 as a reference voltage for voltage dividing.

The timing control circuit 223 transmits the vertical clock signal and the vertical synchronous signal to the scanning driving circuit 221, and converts the video signal received from the external interface into the data signal used by the data driving circuit 222, and transmits the data signal, the horizontal clock signal and the horizontal synchronizing The signal is sent to the data driving circuit 222. The scan driving circuit 221 sequentially turns on the scan lines S ₂₁ -S _2M according to the vertical clock signal and the vertical sync signal. When the scanning lines S ₂₁ -S _2M are turned on, the data driving circuit 222 divides the data signal corresponding to each row of pixels according to the gamma voltage to obtain the voltage signal for driving the pixels, and transmits the data signal through the data lines D ₂₁ -D _2N Send the driving voltage signal to the pixel and drive it.

The liquid crystal display device 2 further includes a signal compensation unit (not shown). Since the resistance-capacitance delay effect corresponding to the pixels of each scan line S ₂₁ ~ S _2M is different, in fact, if the resistance-capacitance delay effect is considered, the pixels of different scan lines have the same gray scale value. The voltage signals should be different to compensate for resistor-capacitor delay effects. Therefore, the present invention uses the signal compensation unit to compensate the signal to solve the problem caused by the resistance-capacitance delay effect. The following uses FIGS. 3 to 5 as examples to illustrate aspects of the signal compensation unit.

first embodiment

Referring to FIG. 3 , the liquid crystal display device 5 of this embodiment includes a liquid crystal display panel 51 , a driving module 52 and a signal compensation unit 53 . Wherein, the signal compensating unit 53 may be a digital signal adjusting unit, for example, used to adjust a video signal. The liquid crystal display panel 51 has a plurality of pixels, and the pixels are located at the intersections of the scanning lines and the data lines on the liquid crystal display panel 51, including a first pixel and a second pixel, and the first pixel and the second pixel are respectively connected to the liquid crystal display panel 51. The distances between the first sides of the pixels are different, and the first pixel and the second pixel are electrically connected to different scanning lines.

The driving module 52 includes a scan driving circuit 521 , a data driving circuit 522 and a timing control circuit 523 . The scanning driving circuit 521 is electrically connected to the scanning lines on the liquid crystal display panel 51 , and the data driving circuit 522 is electrically connected to the data lines on the liquid crystal display panel 51 .

The timing control circuit 523 converts the video signal received from the external interface into a data signal used by the data driving circuit 522, and the data signal includes a grayscale signal corresponding to each pixel. Wherein, the data signal corresponding to the first pixel is the first signal, and the data signal corresponding to the second pixel is the second signal. The signal compensation unit 53 respectively converts the first signal and the second signal into a first compensation signal S _C11 and a second compensation signal S _C12 , and the first and second compensation signals are digital signals. Wherein, the signal compensation unit 53 can determine the compensation signal corresponding to each grayscale data signal by calculating, measuring or simulating signal attenuation caused by pixels at different positions in advance.

The data driving circuit 522 outputs the first voltage signal to the reference voltage provided by the gamma voltage generation unit 524 according to the first compensation signal S _C11 to drive the first pixel, and the gamma voltage generation unit 524 according to the second compensation signal S _C12 The provided reference voltage outputs a second voltage signal to drive the second pixel. And when the first pixel and the second pixel operate according to the same grayscale value, the first compensation signal S _C11 is not substantially equal to the second compensation signal S _C12 , so that the first voltage signal is different from the second voltage signal. And when the distance between the first pixel and the second pixel is farther, the difference between the first compensation signal and the second compensation signal is larger; when the distance between the first pixel and the second pixel is closer, the difference between the first compensation signal and the second The smaller the difference between the two compensation signals, the smaller the difference between the first voltage signal and the second voltage signal is and the distance between the first pixel and the second pixel is positively correlated.

Since the resistance-capacitance delay effect corresponding to the pixels of each scan line is different, in fact, if the resistance-capacitance delay effect is considered, the pixels of different scan lines have different driving voltage signals under the same gray scale value. Therefore, in this embodiment, the signal compensation unit 53 is used to compensate the signal to solve the problem caused by the resistor-capacitor delay effect.

In this embodiment, the signal compensation unit 53 can be software, and the timing control circuit 523 performs a compensation calculation according to the software, so that when the first pixel and the second pixel operate according to the same gray scale value, the first compensation signal is substantially different from second compensation signal. Moreover, the software can also be changed through an external input signal, so that the compensation signal can be dynamically adjusted. Of course, the signal compensation unit 53 can also be a hardware circuit, for example, including a lookup table or a logic circuit, integrated and designed in the timing control circuit 523 .

second embodiment

Referring to FIG. 4 , different from the above-mentioned embodiments, the signal compensation unit 53 is electrically connected to the gamma voltage generating unit 524 , or has an integrated design with it. Here, the integrated design is taken as an example. The signal compensation unit 53 can make the gamma voltage generation unit 524 provide different reference voltages (namely, the first compensation signal and the second compensation signal) according to different scanning lines when the first pixel and the second pixel are driven according to the same gray scale value. signal) to the data driving circuit 522.

The signal compensation unit 53 can adjust the reference voltage supplied to the data driving circuit 522 according to different scanning lines, and the data driving circuit 522 will adjust the reference voltage provided by the signal compensation unit 53 according to the data signal received from the timing control circuit 523 To divide the voltage to drive each pixel.

The compensation method of the signal compensation unit 53 can be, for example: in the case of the same gray scale value, the reference voltage provided by the pixel (such as the first pixel) closer to the data driving circuit 522 (such as the first compensation signal SC21) is smaller , on the contrary, the reference voltage (such as the second compensation signal SC22 ) provided by the pixel (such as the second pixel) that is farther away is larger. In this way, the resistance-capacitance effect can be compensated to improve the display effect.

The gamma voltage generation unit 524 can adjust the reference voltage provided by it through the signal compensation unit 53; or, the signal compensation unit 53 can have a plurality of resistor strings, and each resistor string is corresponding to each scanning line, so that each resistor string can be In the case of the same gray scale value, different reference voltages are output.

third embodiment

Referring to FIG. 5 , different from the above embodiments, the signal compensation unit 53 is a part of the data driving circuit 522 . The signal compensation unit 53 includes, for example, a plurality of different filter circuits, and each filter circuit may include a resistor-capacitor low-pass filter, or include a plurality of different digital/analog converters. In this embodiment, the data signal transmitted from the timing control circuit 523 to the data driving circuit 522 is not adjusted, nor is the reference voltage provided by the gamma voltage generating unit 524 adjusted, but the data driving circuit 522 corresponds to different The scan lines adjust the voltage signals that drive the pixels. For example, with the filter circuit described above, each filter circuit corresponds to a different scan line, so that different filter circuits can output different voltage signals corresponding to different scan lines under the same gray scale value, such as the first compensation signal S _C31 and the second compensation signal S _C32 . It should be noted that the signal compensation methods of the first to third embodiments can be used simultaneously.

The liquid crystal display devices of all the above-mentioned embodiments are for illustration only. Since the technical focus of the present invention is on signal compensation, the present invention does not limit the types and structures of the liquid crystal display devices. The present invention can be applied to different types of liquid crystal display devices, such as twisted nematic (Twisted Nematic, TN) and super twisted nematic (Super Twisted Nematic, STN) liquid crystal display devices, etc.; can also be used in multiple modes, such as polar Sexual inversion mode, including frame inversion, row inversion, column inversion, dot inversion, etc.

The invention is illustrated below in terms of some applications. Referring to FIG. 6 , it is an application of the technical features contained in the driving module 52 of the liquid crystal display device 5 shown in FIG. 5 . The data driving circuit 222 has a plurality of shift registers (shift register) SR ₂₁ ˜SR _2N , a plurality of first data registers (latch) FL ₂₁ ˜FL _2N , a plurality of second data registers SL ₂₁ ˜SL _2N , A plurality of level shifters (level shifters) LS ₂₁ -LS _2N , a plurality of digital/analog conversion (DAC) units DA, and a plurality of analog buffer amplifiers (analog buffer amplifiers) AB ₂₁ -AB _2N .

The shift registers SR ₂₁ - SR _2N are connected in series, and the first data registers FL ₂₁ - FL _2N are sequentially turned on according to the horizontal clock signal Hc and the horizontal synchronization signal Hs, so as to correspond to the same scanning line (such as the scanning line S ₂₁ ). The data signals of each pixel P ₂ can be stored in the first data registers FL ₂₁ ˜FL _2N . The first data buffers FL ₂₁ - FL _2N transfer the data signals to the second data buffers SL ₂₁ - SL _2N at the same time according to the next high voltage of the horizontal synchronization signal Hs. And at the same time of the high voltage, the shift registers SR ₂₁ ˜ SR _2N turn on the first data registers FL ₂₁ ˜ FL _2N sequentially again according to the horizontal clock signal Hc and the horizontal synchronizing signal Hs, so that the corresponding next scanning line (for example The data signals of each pixel _P2 of _the scan line S22) can be stored in the first data registers _FL21˜FL2N .

The level shifters LS ₂₁ -LS _2N boost the voltages of the data signals stored in the second data registers SL ₂₁ -SL _2N , and output them to the digital/analog converting unit DA. In this embodiment, the digital/analog conversion unit DA is the signal compensation unit. Each digital/analog conversion unit DA includes a plurality of different digital/analog converters DA ₂₁ -DA _2M .

In this embodiment, each digital/analog converter DA ₂₁ ˜DA _2M corresponds to each scanning line S ₂₁ ˜S _2M , that is, the data signals of pixels corresponding to each scanning line position are all transmitted to corresponding digital/analog converters. Converter DA ₂₁ ~ DA _2M . Taking the first pixel P ₂₁ as an example, it is electrically connected to the first scan line S ₂₁ , so its data signal (namely the first signal) is output to the digital/analog converter when it is output by the level shifter LS ₂₁ DA ₂₁ , the digital/analog converter DA ₂₁ divides the reference voltage provided by the gamma voltage generating unit 224 according to the data signal, and outputs an analog voltage signal (ie, the first compensation signal). Taking the second pixel P ₂₂ as an example, it is electrically connected to the Mth scan line S _2M , so its data signal (that is, the second signal) is output to the digital/analog converter when it is output by the level shifter LS ₂₁ DA _2M , the digital/analog converter DA _2M divides the reference voltage provided by the gamma voltage generating unit 224 according to the data signal, and outputs an analog voltage signal (that is, the second compensation signal), and so on for other pixels.

The digital/analog converters DA ₂₁ -DA _2M output voltage signals to the analog buffer amplifiers AB ₂₁ -AB _2N according to the gamma voltage provided by the gamma voltage generating unit 224, and then transmit the voltage signals through the data lines D ₂₁ -D _2N Send to each pixel _P2 and drive it.

It needs to be additionally explained that in this embodiment, the positions of the first pixel _P21 and the second pixel _P22 are for illustrative purposes only, and do not represent their absolute positions; the first pixel _P21 and the second pixel _P22 represent two pixels with different positions.

Since the resistor-capacitor delay effects corresponding to the scan lines S ₂₁ -S _2M are different, different digital/analog converters DA ₂₁ -DA _2M can perform different compensations for the data signals of different scan lines. In addition, when the distance between two different pixels is farther, the difference between the first compensation signal and the second compensation signal is larger; when the distance is closer, the difference between the first compensation signal and the second compensation signal is smaller. In this way, all signals are compensated for resistive-capacitive delay effects, so that all pixels can operate precisely according to the gray scale value. Of course, in addition to the compensation for the resistor-capacitor delay effect, this embodiment may also include other compensations.

In this embodiment, the different digital/analog converters DA ₂₁ -DA _2M mainly mean that the reference voltages provided by the gamma voltage generating unit 224 are different, which can be achieved by the digital/analog converters DA ₂₁ -DA _{The 2M} and the gamma voltage generation unit 224 have different wiring configurations to achieve this. For example, the digital/analog converters DA ₂₁ -DA _2M may have the same number of bits, such as six bits, but the reference voltages on which the same data signal is based are different. In terms of six bits, the digital/analog converters DA ₂₁ -DA _2M can respectively correspond to 64 voltage values (V ₀ -V ₆₃ ). When the data signal is eg [010011], its corresponding reference voltage is V ₁₈ , but V ₁₈ corresponds to different reference voltages in different digital/analog converters DA ₂₁ -DA _2M .

Referring to FIG. 7 , it is another application of the technical features included in the driving module 52 of the liquid crystal display device 5 shown in FIG. 5 . Signal compensation for this application can be achieved using filter circuits. The liquid crystal display device 4 has a plurality of filter units F, and the filter units F are signal compensation units. Each filter unit F has different filter circuits F ₄₁ -F _4M . Each filter circuit F ₄₁ -F _4M may include a resistor-capacitor (RC) low-pass filter. In this embodiment, the filter circuits F ₄₁ -F _4M are arranged between the digital/analog converters DA ₄₁ -DA _4N and the analog buffer amplifiers AB ₄₁ -AB _4N .

In this embodiment, each filter circuit F ₄₁ -F _4M corresponds to each scan line S ₄₁ -S _4M , that is, the voltage signals of pixels corresponding to the same scan line are all sent to the same filter circuit F ₄₁ -F _4M . Taking the first pixel P ₄₁ as an example, it is electrically connected to the first scan line S ₄₁ , so its voltage signal (namely the first signal) is sent to the filter circuit F41 when output by the digital/analog converter DA ₄₁ and then converted to the first compensation signal. Taking the second pixel P ₄₂ as an example, it is electrically connected to the Mth scan line S _4M , so its voltage signal (that is, the first signal) is sent to the filter circuit F _4M when it is output by the digital/analog converter DA ₄₁ And convert it into the first compensation signal, and so on for the rest of the pixels.

Since the resistor-capacitor delay effects corresponding to the scan lines S ₄₁ -S _4M are different, the data signals of different scan lines can be compensated differently by using different filter circuits F ₄₁ -F _4M . In addition, when the distance between two different pixels is farther, the difference between the first compensation signal and the second compensation signal is larger; when the distance is closer, the difference between the first compensation signal and the second compensation signal is smaller. In this way, all signals are compensated for resistive-capacitive delay effects, so that all pixels can operate precisely according to the gray scale value.

After the filter circuits F ₄₁ -F _4M output the voltage signals to the analog buffer amplifiers AB ₄₁ -AB _4N , they are transmitted through the data lines D ₄₁ -D _4N to drive each pixel P ₄ .

Referring to FIG. 8 , it is an application of the technical features contained in the driving module 52 of the liquid crystal display device 5 shown in FIG. 4 . The gamma voltage generation unit 324 is electrically connected to each digital/analog converter DA ₃₁ -DA _3N . In this embodiment, the gamma voltage generation unit 324 is the signal compensation unit. Wherein, the gamma voltage generating unit 324 has a plurality of different voltage dividing circuits G ₃₁ -G _3M , such as a plurality of resistor strings. Each voltage dividing circuit G ₃₁ -G _3M corresponds to each scanning line S ₃₁ -S _3M respectively, which means that each digital/analog converter DA ₃₁ -DA _3N corresponds to each pixel of each scanning line according to each voltage dividing circuit G ₃₁ -G _3M Divide the voltage to generate an analog voltage signal to drive the pixel.

Taking the first pixel P ₃₁ as an example, it is electrically connected to the first scan line S ₃₁ . When the data signal corresponding to the first pixel _P31 (that is, the first signal) is transmitted to the digital/analog converter _DA31 , the digital/analog converter _DA31 divides the reference voltage provided by the voltage dividing circuit _G31 according to the data signal And output the driving voltage signal (that is, the first compensation signal). Taking the second pixel P ₃₂ as an example, it is electrically connected to the Mth scan line S _3M . When the data signal (that is, the second signal) corresponding to the second pixel _P32 is transmitted to the digital/analog converter _DA31 , the digital/analog converter _DA31 divides the reference voltage provided by the voltage dividing circuit _G3M according to the data signal And output the driving voltage signal (that is, the second compensation signal), and so on for the rest of the pixels _P3 .

Since the resistor-capacitor delay effects corresponding to the scan lines S ₃₁ ˜S _3M are different, the data signals of different scan lines can be compensated differently by using different voltage dividing circuits G ₃₁ ˜G _3M . In addition, when the distance between two different pixels is farther, the difference between the first compensation signal and the second compensation signal is larger; when the distance is closer, the difference between the first compensation signal and the second compensation signal is smaller. In this way, all signals are compensated for resistive-capacitive delay effects, so that all pixels can operate precisely according to the gray scale value.

After the digital/analog converters DA ₃₁ -DA _3N output the voltage signals to the analog buffer amplifiers AB ₃₁ -AB _3N , they are transmitted through the data lines D ₃₁ -D _3N to drive each pixel P ₃ .

In addition, the gamma voltage generating unit 324 may not include multiple resistor strings, but include a voltage divider circuit that can adjust the reference voltage, such as a resistor string. Corresponding to different scanning lines, the resistor string can adjust its output reference voltage to the data driving circuit 322, so that pixels on different scanning lines can obtain different driving voltage signals under the same gray scale value. For example, the farther the pixel is from the data driving circuit 322 , the larger the reference voltage provided by the gamma voltage generating unit 324 is.

Referring to FIG. 9A , it shows the steps of the pixel driving method according to the first embodiment of the present invention, mainly including steps S11-S14.

In step S11, the first signal is converted into a first compensation signal.

In step S12, the second signal is converted into a second compensation signal.

In this embodiment, the first signal and the second signal can be converted by the above-mentioned signal compensating unit 53 to obtain compensation for the resistance-capacitance delay effect.

In step S13, the first pixel is driven according to the first compensation signal.

In step S14, the second pixel is driven according to the second compensation signal, wherein when the first pixel and the second pixel operate according to the same gray scale value, the first compensation signal is not substantially equal to the second compensation signal. Since the pixel driving method of this embodiment has been disclosed in the above description, it will not be repeated here.

Referring to FIG. 9B , it shows the steps of the pixel driving method according to the second embodiment of the present invention, mainly including steps S21-S23.

In step S21, a grayscale signal is received to drive the first pixel and the second pixel. The grayscale signal can be, for example, the above-mentioned data signal. Because when the first pixel and the second pixel operate according to the same gray scale value, the data signals they both base on are the same, so step S21 only illustrates receiving a gray scale signal to drive the first pixel and the second pixel.

In step S22, according to the position of the first pixel on the liquid crystal display panel 51, the grayscale signal is converted into a first voltage signal; and in step S23, according to the position of the second pixel on the liquid crystal display panel 51, the grayscale signal is converted into A second voltage signal, wherein the first voltage signal is not equal to the second voltage signal. Since pixels at different positions have different resistance-capacitance delay effects, compensation is performed according to the positions of the first pixel and the second pixel, such as the scanning lines connected to them, and the grayscale signal is converted into different voltages Signals, the first voltage signal and the second voltage signal in step S22 are, for example, the above-mentioned first compensation signal and second compensation signal. Since the compensation method has been described in detail in the driving module 52 of the second embodiment and the third embodiment, it is not repeated here.

Referring to FIG. 9C , it shows the steps of the pixel driving method according to the third embodiment of the present invention, mainly including step S31 to step S33 .

In step S31, a first signal corresponding to a first pixel and a second pixel is received. Here, the first signal is, for example, the above-mentioned data signal or grayscale signal. Because when the first pixel and the second pixel operate according to the same gray scale value, the data signal they rely on is the same, so step S31 only illustrates receiving a first signal to drive the first pixel and the second pixel.

In step S32, according to the position of the first pixel, the first signal is correspondingly adjusted to be the first compensation signal; and in step S33, the first pixel and the second pixel are respectively driven according to the first compensation signal and the first signal, wherein the first compensation The signal is not equal to the first signal. Since pixels at different positions have different resistor-capacitor delay effects, compensation is performed according to the positions of the first pixel and the second pixel. In particular, this embodiment only performs compensation for the first pixel, which can be regarded as taking the second pixel as a reference. Since the compensation method has been described in detail in the driving module 52 of the first to third embodiments, it is not repeated here.

In summary, according to a liquid crystal display device and a pixel driving method of the present invention, the signal is compensated, and pixels operating at the same gray scale value but at different positions are driven by different compensation signals, so that The resistance-capacitance delay effect caused by the data line is compensated, so that each pixel can be accurately operated according to the gray scale value, thereby avoiding display image distortion and improving display efficiency.

The above descriptions are illustrative only, not restrictive. Any equivalent modifications or changes made without departing from the spirit and scope of the present invention shall be included in the scope of the appended claims.

Claims (16)

1. A pixel driving method for driving a liquid crystal display panel, the liquid crystal display panel has a first side, a first pixel and a second pixel, wherein the first pixel and the second pixel are respectively connected to the first side The distance between the sides is different, the pixel driving method includes the following steps: converting the first signal into a first compensation signal; converting the second signal into a second compensation signal; driving the first pixel according to the first compensation signal; and The second pixel is driven according to the second compensation signal, wherein when the first pixel and the second pixel operate according to the same gray scale value, the first compensation signal is not substantially equal to the second compensation signal. 2. The pixel driving method according to claim 1, wherein the liquid crystal display panel has a plurality of scanning lines, and the first pixel and the second pixel are electrically connected to different scanning lines. 3. The pixel driving method as claimed in claim 1, wherein when the distance between the first pixel and the second pixel is farther, the difference between the first compensation signal and the second compensation signal is larger. 4. The pixel driving method as claimed in claim 1, wherein the difference between the first compensation signal and the second compensation signal is smaller when the distance between the first pixel and the second pixel is closer. 5. The pixel driving method as claimed in claim 1, wherein the first compensation signal and the second compensation signal are analog voltage signals. 6. The pixel driving method as claimed in claim 5, wherein the first compensation signal is generated by a first digital/analog converter, and the second compensation signal is generated by a second digital/analog converter. 7. The pixel driving method as claimed in claim 5, wherein the first compensation signal is generated by a first voltage dividing circuit, and the second compensation signal is generated by a second voltage dividing circuit. 8. The pixel driving method as claimed in claim 5, wherein the first compensation signal and the second compensation signal are generated by an adjustable voltage dividing circuit. 9. The pixel driving method as claimed in claim 5, wherein the first compensation signal is generated by a first filter circuit, and the second compensation signal is generated by a second filter circuit. 10. The pixel driving method according to claim 9, wherein the first filter circuit and/or the second filter circuit comprises a resistor-capacitor low-pass filter. 11. The pixel driving method as claimed in claim 1, wherein the first compensation signal and the second compensation signal are digital data signals. 12. The pixel driving method as claimed in claim 11, further comprising a step of: A compensation calculation is performed so that when the first pixel and the second pixel operate according to the same gray scale value, the first compensation signal is not substantially equal to the second compensation signal. 13. The pixel driving method as claimed in claim 1, wherein the first signal and the second signal are digital data signals or analog voltage signals. 14. A liquid crystal display device, comprising: A liquid crystal display panel, which has a first side, a first pixel, and a second pixel, and the distances between the first pixel and the second pixel are different from the first side; a signal compensation unit that converts the first signal and the second signal into a first compensation signal and a second compensation signal, respectively; and a driving module, which drives the first pixel according to the first compensation signal, and drives the second pixel according to the second compensation signal, and when the first pixel and the second pixel operate according to the same gray scale value, the first pixel A compensation signal is not substantially equal to the second compensation signal. 15. A pixel driving method for driving a liquid crystal display panel, the liquid crystal display panel comprising a first pixel and a second pixel, the pixel driving method comprising the following steps: receiving a grayscale signal for driving the first pixel and the second pixel; converting the grayscale signal into a first voltage signal according to the position of the first pixel on the liquid crystal display panel; and Converting the grayscale signal into a second voltage signal according to the position of the second pixel on the liquid crystal display panel, wherein the first voltage signal is not equal to the second voltage signal. 16. A pixel driving method for driving a liquid crystal display panel, the liquid crystal display panel has a first side, a first pixel, and a second pixel, wherein the first pixel and the second pixel are respectively connected to the first side The distance between the sides is different, the pixel driving method includes the following steps: receiving a first signal corresponding to the first pixel and the second pixel; Correspondingly adjusting the first signal to be a first compensation signal according to the position of the first pixel; and The first pixel and the second pixel are respectively driven according to the first compensation signal and the first signal, wherein the first compensation signal is not equal to the first signal.

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