KR101264697B1 - Apparatus and method for driving liquid crystal display device - Google Patents

Abstract

The present invention relates to a driving device and a driving method of a liquid crystal display device capable of improving the image quality displayed on the liquid crystal panel.

A driving device of a liquid crystal display according to the present invention includes a liquid crystal panel in which a liquid crystal cell is formed in a region defined by a plurality of gate lines and a plurality of data lines; A gate driver supplying a gate signal to the gate line; A data driver for supplying an image signal to the data line; And a timing controller for controlling the gate and the data driver, wherein the data driver supplies image signals of different polarities to a first group having two horizontally adjacent liquid crystal cells and provides two horizontally adjacent liquid crystal cells. And supplying an image signal of the same polarity to a second group adjacent to the first group.

Inversion, Greenish

Description

Driving apparatus and driving method of liquid crystal display device {APPARATUS AND METHOD FOR DRIVING LIQUID CRYSTAL DISPLAY DEVICE}

1 is a block diagram illustrating a driving device of a general liquid crystal display device.

FIG. 2 is a diagram illustrating a polar pattern of an image signal supplied to the liquid crystal panel illustrated in FIG. 1.

FIG. 3 is a waveform diagram illustrating distortion of a common voltage due to a polar pattern of the image signal shown in FIG. 2.

4 is a block diagram schematically illustrating a driving device of a liquid crystal display according to a first embodiment of the present invention.

FIG. 5 is a block diagram schematically illustrating the data driver shown in FIG. 4. FIG.

FIG. 6 is a circuit diagram illustrating a digital-analog converter of the data driver shown in FIG. 5.

7 illustrates a polar pattern of an image signal supplied to a liquid crystal panel according to a first exemplary embodiment of the present invention.

8 illustrates a polar pattern of an image signal supplied to a liquid crystal panel according to a second exemplary embodiment of the present invention.

9 is a waveform diagram illustrating image signals according to first and second embodiments of the present invention;

FIG. 10 is a circuit diagram illustrating a digital-analog converter of a data driver of a driving apparatus of a liquid crystal display according to a third exemplary embodiment of the present invention.

11 is a diagram illustrating a polar pattern of an image signal supplied to a liquid crystal panel according to a third exemplary embodiment of the present invention.

12 illustrates a polar pattern of an image signal supplied to a liquid crystal panel according to a fourth exemplary embodiment of the present invention.

13 is a waveform diagram illustrating image signals according to third and fourth embodiments of the present invention;

<Explanation of Signs of Major Parts of Drawings>

146: latch portion

170: first decoder 172: second decoder

173: selection

180: first decoding unit 182: second decoding unit

190: voltage conversion unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device and a driving method of a liquid crystal display device, and more particularly, to a driving device and a driving method of a liquid crystal display device capable of improving the image quality displayed on a liquid crystal panel.

Recently, various flat panel display devices that can reduce weight and volume, which are disadvantages of cathode ray tubes, have emerged. Such display devices include liquid crystal displays, field emission displays, plasma display panels, and light emitting displays.

The liquid crystal display adjusts an image by adjusting light transmittance of pixels according to a data signal. In an active matrix liquid crystal display, switching elements are formed for each pixel, which is advantageous for displaying a moving image. Thin film transistors are mainly used as switching elements.

1 is a block diagram illustrating a driving device of a general liquid crystal display device.

Referring to FIG. 1, a driving apparatus of a general liquid crystal display device includes a liquid crystal panel 2 in which a liquid crystal cell is formed in a region defined by a plurality of gate lines GL1 through GLn and a plurality of data lines DL1 through DLm; A gate driver 6 for sequentially supplying gate signals to the gate lines GL1 to GLn, a data driver 4 for supplying image signals to the data lines DL1 to DLm so as to be synchronized with the gate signal, and from outside The input data RGB is aligned and supplied to the data driver 4, the timing controller 8 for controlling the gate and the data drivers 6 and 4, and the common voltage Vcom are generated to generate the common voltage Vcom to the liquid crystal panel 2. The common voltage generator 10 is provided.

The liquid crystal panel 2 includes a thin film transistor array substrate and a color filter array substrate bonded to each other, a spacer for maintaining a constant cell gap between the two array substrates, and a liquid crystal layer filled in a liquid crystal space provided by the spacer. .

The color filter array substrate includes a color filter, a common electrode, a black matrix, and the like. Here, the common electrode may be formed on the transistor array substrate.

The thin film transistor array substrate is formed in a region defined by m data lines DL1 through DLm and n gate lines GL1 through GLn, and is connected to a gate line and a data line, and a liquid crystal connected to the thin film transistor. It consists of a cell.

The thin film transistor supplies an image signal from the data line DL to the liquid crystal cell in response to the gate signal from the gate line GL.

Since the liquid crystal cell is composed of a common electrode and a pixel electrode connected to the thin film transistor, the liquid crystal cell may be equivalently represented as a liquid crystal capacitor Clc. The liquid crystal cell also includes a storage capacitor Cst for maintaining the image signal charged in the liquid crystal capacitor Clc until the next image signal is charged.

The timing controller 8 arranges the input data RGB from the outside so as to be suitable for driving the liquid crystal panel 2, and supplies the input data RGB to the data driver 4. In addition, the timing controller 8 receives the gate and data control signals GCS and DCS using a dot clock DCLK, horizontal and vertical synchronization signals Hsync and Vsync, and a data enable signal DE. It generates and controls the driving timing of each of the gate and data drivers 6 and 4.

The common voltage generator 10 generates a common voltage Vcom using an input power source from the outside and supplies the common voltage Vcom to the common electrode formed on the liquid crystal panel 2.

The gate driver 6 sequentially generates a gate signal according to the gate control signal GCS from the timing controller 8, and supplies the gate signal to the gate line GL.

The data driver 4 converts the data Data supplied from the timing controller 8 into an image signal according to the data control signal DCS supplied from the timing controller 8 to supply the gate signal to the gate line GL. An image signal for one horizontal line is supplied to the data lines DL every one horizontal period. At this time, the data driver 4 inverts the polarities of the image signals supplied to the data lines DL in response to the polarity control signal POL.

In such a liquid crystal display device, in order to drive the liquid crystal cells on the liquid crystal panel 2, in-frame conversion method such as a frame inversion system, a line column inversion system, and a dot inversion system may be used. The version drive method is used.

Among such inversion driving methods, the dot inversion method provides a picture of superior picture quality compared to the frame and line inversion methods.

When the white and black patterns are repeatedly displayed by using the dot inversion driving method illustrated in FIG. 2, the picture quality becomes greenish due to the distortion of the common voltage Vcom. This will occur.

Specifically, in the dot inversion driving method, since the output ratios of the positive data voltage and the negative data voltage supplied on one horizontal line are different, as shown in FIG. Vcom) is shifted toward the positive data voltage or the negative data voltage. Therefore, in the image displayed on the liquid crystal panel 2, the green (G) liquid crystal cell becomes relatively brighter than the red (R) and blue (B) liquid crystal cell, thereby making the image displayed on the liquid crystal panel 2 greenish. There is a problem.

Such greenish may occur in the 2-dot inversion method as well as the dot inversion method.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a driving device and a driving method of a liquid crystal display device which can improve the image quality displayed on the liquid crystal panel.

According to an aspect of the present invention, a driving apparatus of a liquid crystal display device includes: a liquid crystal panel in which a liquid crystal cell is formed in an area defined by a plurality of gate lines and a plurality of data lines; A gate driver supplying a gate signal to the gate line; A data driver for supplying an image signal to the data line; And a timing controller for controlling the gate and the data driver, wherein the data driver supplies image signals of different polarities to a first group having two horizontally adjacent liquid crystal cells and provides two horizontally adjacent liquid crystal cells. And supplying an image signal of the same polarity to a second group adjacent to the first group.

Another liquid crystal display device driving apparatus according to the present invention according to the above object is a liquid crystal panel in which a liquid crystal cell is formed in a region defined by a plurality of gate lines and a plurality of data lines; A gate driver supplying a gate signal to the gate line; A data driver for supplying an image signal to the data line; And a timing controller controlling the gate and the data driver, wherein the data driver supplies image signals of different polarities to a first group having two horizontally adjacent liquid crystal cells, and two horizontally adjacent liquid crystals. Supplying an image signal having the same polarity to a second group adjacent to the first group with a cell, and a polarity of the image signal supplied to the second group to a third group having one liquid crystal cell adjacent to the second group; It is characterized by supplying an image signal of opposite polarity.

According to an aspect of the present invention, there is provided a method of driving a liquid crystal display device, wherein the liquid crystal cell is formed in a region defined by a plurality of gate lines and a plurality of data lines. Supplying a first step; And supplying an image signal of different polarity to the first group having two horizontally adjacent liquid crystal cells, and providing an image signal of the same polarity to a second group adjacent to the first group with two horizontally adjacent liquid crystal cells. And a second step of supplying.

According to another aspect of the present invention, there is provided a method of driving a liquid crystal display device, wherein the liquid crystal cell is formed in a region defined by a plurality of gate lines and a plurality of data lines. A first step of supplying a signal; And supplying an image signal of different polarity to the first group having two horizontally adjacent liquid crystal cells, and providing an image signal of the same polarity to a second group adjacent to the first group with two horizontally adjacent liquid crystal cells. And supplying an image signal having a polarity opposite to that of the image signal supplied to the second group to a third group having one liquid crystal cell adjacent to the second group. do.

Hereinafter, a driving apparatus and a driving method of the liquid crystal display according to the present invention will be described in detail with reference to the accompanying drawings.

4 is a block diagram schematically illustrating a driving device of a liquid crystal display according to a first embodiment of the present invention.

Referring to FIG. 4, in the driving apparatus of the liquid crystal display according to the first embodiment of the present invention, a liquid crystal cell is formed in an area defined by a plurality of gate lines GL1 through GLn and a plurality of data lines DL1 through DLm. The formed liquid crystal panel 102, the gate driver 106 for sequentially supplying gate signals to the gate lines GL1 to GLn, and the data driver for supplying image signals to the data lines DL1 to DLm in synchronization with the gate signals. And a timing controller 108 for arranging the 104 and the input data RGB from the outside and supplying them to the data driver 104, and controlling the gate and the data drivers 106 and 104, and generating a common voltage Vcom. And a common voltage generator 110 to supply the liquid crystal panel 102 and a gamma circuit 112 to supply a gamma voltage to the data driver 104. The data driver 104 includes two liquid crystal cells horizontally adjacent to each other. Go to In addition to supplying the image signals of different polarities to the first group, the paper has two liquid crystal cells horizontally adjacent to each other and supplies the image signals of the same polarity to the second group adjacent to the first group.

The liquid crystal panel 102 includes a thin film transistor array substrate and a color filter array substrate bonded to each other, a spacer for maintaining a constant cell gap between the two array substrates, and a liquid crystal layer filled in a liquid crystal space provided by the spacer. .

The color filter array substrate includes a color filter, a common electrode, a black matrix, and the like. Here, the common electrode may be formed on the transistor array substrate.

The thin film transistor array substrate is formed in a region defined by m data lines DL1 through DLm and n gate lines GL1 through GLn, and is connected to a gate line and a data line, and a liquid crystal connected to the thin film transistor. It consists of a cell.

The thin film transistor supplies an image signal from the data line DL to the liquid crystal cell in response to the gate signal from the gate line GL.

Since the liquid crystal cell is composed of a common electrode and a pixel electrode connected to the thin film transistor, the liquid crystal cell may be equivalently represented as a liquid crystal capacitor Clc. The liquid crystal cell also includes a storage capacitor Cst for maintaining the image signal charged in the liquid crystal capacitor Clc until the next image signal is charged.

The timing controller 108 arranges the input data RGB from the outside to be suitable for driving the liquid crystal panel 102 and supplies the input data RGB to the data driver 104. In addition, the timing controller 108 receives the gate and data control signals GCS and DCS using dot clocks DCLK, horizontal and vertical synchronization signals Hsync and Vsync, and data enable signals DE. It generates and controls the driving timing of each of the gate and data drivers 106 and 104.

The common voltage generator 110 generates a common voltage Vcom using an input power source from the outside and supplies the common voltage Vcom to the common electrode formed on the liquid crystal panel 102.

The gate driver 106 sequentially generates a gate signal according to the gate control signal GCS from the timing controller 108, and supplies the gate signal to the gate line GL.

The gamma circuit 112 generates a plurality of positive (+) and negative (−) gamma voltages which are preset to have different voltage levels, and supplies them to the data driver 104.

The data driver 104 uses data from the timing controller 108 in accordance with the data control signal DCS from the timing controller 108 using a plurality of positive and negative gamma voltages supplied from the gamma circuit 112. Data is converted into an image signal, and the image signal of one horizontal line is supplied to the data lines DL every one horizontal period in which the gate signal is supplied to the gate line GL. At this time, the data driver 104 inverts the polarities of the image signals supplied to the data lines DL in response to the polarity control signal POL.

To this end, as shown in FIG. 5, the data driver 104 sequentially shifts the data from the timing controller 108 according to the shift register unit 144 that sequentially generates a sampling signal and the sampling signal. A latch unit 146 for latching, a digital-analog converter 160 for converting the latched data into an image signal according to the polarity control signal POL from the timing controller 108, and a digital-analog converter 160 And an output buffer unit 156 for buffering and outputting the image signal from

The shift register unit 144 sequentially shifts the source start pulse SSP from the timing controller 108 in accordance with the source sampling clock signal SSC and outputs the sampling signal.

The latch unit 146 sequentially samples and latches data from the timing controller 108 in response to a sampling signal from the shift register unit 144, and latches the data from the timing controller 108 to the source output enable. Accordingly, the latched data is output to the digital-analog converter 160 through the output terminals L01 to L0m.

The digital-to-analog converter 160 generates a positive (+) or a negative (-) image signal corresponding to the latched data by using the plurality of positive and negative gamma voltages and outputs the output signal to the output buffer unit 156. Supply.

To this end, the digital-to-analog converter 160 may use a plurality of positive and negative gamma voltages as shown in FIG. M (where m is a natural number) voltage converting unit 190 to be output as an image signal.

Each of the m voltage converters 190 may include a first decoder 170 for generating a positive image signal corresponding to the latched data, and a second decoder 172 for generating a negative image signal corresponding to the latched data. And a selection unit (MUX) 173 for selectively outputting a positive or negative image signal in accordance with the polarity control signal.

The first decoder 170 generates a positive image signal corresponding to the latched data supplied from each output terminal L01 to L0m of the latch unit 146 by using the plurality of positive gamma voltages.

The second decoder 172 generates a negative image signal corresponding to the latched data supplied from each output terminal L01 to L0m of the latch unit 146 by using the plurality of negative gamma voltages.

At this time, the output terminals LO1 to LOm of the latch unit 146 are commonly connected to the first decoder 170 and the second decoder 172.

Meanwhile, the m voltage converters 190 include a plurality of first decoders 180 including two voltage converters for supplying an image signal to a first group having two adjacent liquid crystal cells, and two adjacent to the first group. It is divided into a plurality of second decoding units 182 composed of two voltage converters for supplying an image signal to a second group having two liquid crystal cells.

The first and second decoders 170 and 172 of the two voltage converters constituting the first decoder 180 are arranged in the same order. On the other hand, the first and second decoders 170 and 172 of the two voltage converters constituting the second decoding unit 182 are arranged in the opposite order.

That is, in the first decoding unit 180 including the i-th and i + 1-th voltage converters, the order of the first and second decoders 170 and 172 of the i-th voltage converter is the i + 1-th voltage converter. same. In contrast, in the second decoding unit 182 including the i + 2 th and i + 3 th voltage converters, the order of the first and second decoders 170 and 172 of the i + 2 th voltage converter is i + 3 th. The opposite of the voltage converter.

In addition, the order of the first and second decoders 170 and 172 between the adjacent first decoding units 180 is reversed. Similarly, the order of the first and second decoders 170 and 172 between the adjacent second decoding units 182 is reversed.

Each of the selectors 173 includes a first input terminal to which a positive image signal is supplied from the first decoder 170 of the voltage converter 190, and a negative polarity from the second decoder 172 of the voltage converter 190. And a selection signal input terminal to which the polarity control signal POL is supplied from the timing controller 108 and a second input terminal to which the image signal is supplied.

The inverter 192 for inverting the polarity control signal POL is connected to the selection signal input terminal of the selector 173 included in the even-numbered voltage converter of the m voltage converters 190.

The selector 173 selects a positive (+) picture signal from the first decoder 170 or a negative (-) picture signal from the second decoder 172 in response to the polarity control signal POL. The output is output to the output buffer unit 156.

The output buffer unit 156 buffers the image signal output from the selector 173 of the digital-analog converter 160 and supplies the buffered image signal to the data lines.

Accordingly, when the image pattern in which the white and black images are repeated is displayed on the liquid crystal panel 102 as illustrated in FIG. 7, the i + 1 column of j + 1 rows is positive. Positive image signal, i + 2 column is negative polarity (-) image signal, i + 3 column is positive polarity (+) image signal, i + 4 column is positive polarity (+) image signal, i +5 columns are negative image signals, i + 6 columns are positive image signals, i + 7 columns are negative image signals, and i + 8 columns are negative signals ) Is displayed. The polar pattern as described above is repeated in cycles of eight. Therefore, the i + 9 column of j + 1 row is a positive image signal, the i + 10 column is a negative image signal, the i + 11 column is a positive image signal, i +14 columns show a positive image signal.

Then, the polarity control signal is inverted every one horizontal period so that the pattern of the polarity opposite to the j + 1 row appears in the j + 2 row. That is, the i + 1 column of j + 2 rows is a negative image signal, the i + 2 column is a positive image signal, and the i + 3 column is a negative image signal, i +4 columns are negative image signals, i + 5 columns are positive image signals, i + 6 columns are negative image signals, and i + 7 columns are positive signals ), I + 8 columns are repeated with a cycle of positive polarity (+) image signal.

In the j + 3 row, the same polar pattern as the j + 1 row is repeated, and in the j + 4 row, the same polar pattern as the j + 2 row is repeated.

8 illustrates a polar pattern of an image signal supplied to a liquid crystal panel according to a second exemplary embodiment of the present invention.

The second embodiment has the same polarity pattern as that of the first embodiment and inverts the polarity control signal every two horizontal periods. Therefore, compared with the first embodiment, the polarity pattern of j + 1 rows is the same. However, the polar pattern of j + 2 rows is the same as the polar pattern of j + 1 rows, and the polar patterns of j + 3 rows and j + 4 rows are opposite to the polar patterns of j + 1 rows.

When the image is displayed with the polar pattern of the image signal as described above, as shown in Fig. 9, the output ratios of the positive data voltage and the negative data voltage supplied on one horizontal line are different. Since the same, the distortion of the common voltage Vcom can be prevented to prevent the greenish phenomenon and the horizontal crosstalk phenomenon.

FIG. 10 is a circuit diagram illustrating a digital-analog converter of a data driver in a driving apparatus of a liquid crystal display according to a third exemplary embodiment of the present invention.

The driving device of the liquid crystal display according to the third exemplary embodiment of the present invention has a difference in the digital-analog converter of the data driver compared to the driving device of the liquid crystal display according to the first exemplary embodiment. Is omitted.

In the driving apparatus of the liquid crystal display according to the third embodiment, the data driver supplies image signals having different polarities to the first group having two horizontally adjacent liquid crystal cells, and has two horizontally adjacent liquid crystal cells. Supplying an image signal of the same polarity to the second group adjacent to the first group, and having a liquid crystal cell and having a polarity opposite to that of the image signal supplied to the second group to the third group adjacent to the second group It is characterized by supplying an image signal.

Referring to FIG. 10, the digital-analog converter 160 outputs a positive or negative image signal corresponding to data latched according to a polarity control signal POL using a plurality of positive and negative gamma voltages. M (where m is a natural number) includes a voltage converter 290.

Each of the m voltage converters 290 includes a first decoder 270 for generating a positive image signal corresponding to the latched data, and a second decoder 272 for generating a negative image signal corresponding to the latched data. And a selection unit (MUX) 273 for selectively outputting a positive or negative image signal in accordance with the polarity control signal.

The first decoder 270 generates a positive image signal corresponding to the latched data supplied from each output terminal L01 to L0m of the latch unit 246 using the plurality of positive gamma voltages.

The second decoder 272 generates a negative image signal corresponding to the latched data supplied from each output terminal L01 to L0m of the latch unit 246 using the plurality of negative gamma voltages.

At this time, each output terminal LO1 to LOm of the latch unit 246 is commonly connected to the first decoder 270 and the second decoder 272.

Meanwhile, the m voltage converters 290 may include a plurality of first decoders 280 including two voltage converters for supplying image signals to a first group having two adjacent liquid crystal cells, and two adjacent to the first group. To supply an image signal to a third group having a plurality of second decoding units 282 comprising two voltage converters for supplying an image signal to a second group having two liquid crystal cells and one liquid crystal cell adjacent to the second group. It is divided into a plurality of third decoding units 284 composed of one voltage converter.

The first and second decoders 270 and 272 of the two voltage converters constituting the first decoder 280 are arranged in the same order. On the other hand, the first and second decoders 270 and 272 of the two voltage converters constituting the second decoder 282 are arranged in the opposite order. The order of the first and second decoders 270 and 272 of the voltage converter constituting the third decoder 284 is the first included in the voltage converter for supplying an image signal to the adjacent second group of liquid crystal cells. And the order of the second decoders 270 and 272.

That is, in the first decoding unit 280 including the i-th and i + 1-th voltage converters, the order of the first and second decoders 270 and 272 of the i-th voltage converter is the i + 1-th voltage converter. same. On the other hand, in the second decoding unit 282 including the i + 2 th and i + 3 th voltage converters, the order of the first and second decoders 270 and 272 of the i + 2 th voltage converter is i + 3 th. The opposite of the voltage converter. In the third decoding unit 284 including the i + 4 th voltage converter, the order of the first and second decoders 270 and 272 of the i + 4 th voltage converter is the same as the i + 3 th voltage converter. Done.

In addition, the order of the first and second decoders 270 and 272 between the adjacent first decoding units 280 is reversed. Similarly, the order of the first and second decoders 170 and 172 between the adjacent second decoding units 282 is reversed. In addition, the order of the first and second decoders 270 and 272 between the adjacent third decoding units 284 is reversed.

Each of the selectors 273 includes a first input terminal to which a positive image signal is supplied from the first decoder 270 of the voltage converter 290, and a negative polarity from the second decoder 272 of the voltage converter 290. And a selection signal input terminal to which the polarity control signal POL is supplied from the timing controller 108 and a second input terminal to which the image signal is supplied.

On the other hand, an inverter 292 for inverting the polarity control signal POL is connected to the selection signal input terminal of the selection unit 273 included in the even-numbered voltage conversion unit among the m voltage conversion units 290.

The output buffer 256 buffers the image signal output from the selector 273 of the digital-analog converter 260 and supplies the buffered image signal to the data lines.

Accordingly, as shown in FIG. 11, in the case where an image pattern in which white and black images are repeated on the liquid crystal panel is displayed, the i + 1 column of j + 1 rows is positive (+). ), I + 2 column is negative (-) image signal, i + 3 column is positive (+) image signal, i + 4 column is positive (+) image signal, i + 5 Columns are negative (-) image signals, i + 6 columns are negative image signals (-), i + 7 columns are positive image signals, and i + 8 columns are negative (-) signals The image signal, i + 9 column shows negative polarity (-) image signal, and i + 10 column shows positive polarity (+) image signal. The polar pattern as described above is repeated in cycles of ten. Therefore, the i + 11 column of the j + 1 row shows a positive image signal, and the i + 12 column shows a negative image signal.

Then, the polarity control signal is inverted every one horizontal period so that the polarity pattern opposite to the j + 1 row appears in the j + 2 row. That is, the i + 1 column of j + 2 rows is a negative image signal, the i + 2 column is a positive image signal, and the i + 3 column is a negative image signal, i +4 columns are negative image signals, i + 5 columns are positive image signals, i + 6 columns are positive image signals, and i + 7 columns are negative signals (-). ), I + 8 columns are repeated with positive polarity (+), i + 9 columns with positive polarity (+), i + 10 columns are negative polarity (-) .

In the j + 3 row, the same polar pattern as the j + 1 row is repeated, and in the j + 4 row, the same polar pattern as the j + 2 row is repeated.

12 is a diagram illustrating a polar pattern of an image signal supplied to a liquid crystal panel according to a fourth exemplary embodiment of the present invention.

The fourth embodiment has the same polarity pattern as the third embodiment and inverts the polarity control signal every two horizontal periods. Therefore, compared with the third embodiment, the repeated polarity pattern of j + 1 rows is the same. However, the polar pattern repeated in row j + 2 is the same as the polar pattern of row j + 1, and the polar patterns of row j + 3 and row j + 4 are opposite to the polar pattern of row j + 1.

When the image is displayed with the polar pattern of the image signal as described above, as shown in FIG. 13, the output ratios of the positive data voltage and the negative data voltage supplied on one horizontal line are Since the same, the distortion of the common voltage Vcom can be prevented to prevent the greenish phenomenon and the horizontal crosstalk phenomenon.

The driving apparatus and driving method of the liquid crystal display device as described above have the same ratio between the positive image signal and the negative image signal supplied to the liquid crystal cells of each horizontal line, thereby preventing defects such as greenish phenomenon and horizontal crosstalk phenomenon. It is possible to improve the performance of the liquid crystal display device.

Claims (22)

A liquid crystal panel in which a liquid crystal cell is formed in an area defined by a plurality of gate lines and a plurality of data lines; A gate driver supplying a gate signal to the gate line; A data driver for supplying an image signal to the data line; And A timing controller controlling the gate and data driver, The data driver supplies image signals of different polarities to the first group having two horizontally adjacent liquid crystal cells, and has images of the same polarity to the second group adjacent to the first group with two horizontally adjacent liquid crystal cells. Supply a signal; The data driver includes: A shift register section for sequentially generating sampling signals, A latch unit for sequentially latching data from the timing controller according to the sampling signal; And a digital-to-analog converter for converting the latched data into an image signal having a polarity corresponding to each of the first and second groups according to a polarity control signal from the timing controller. Drive system. The method of claim 1, And the polarity of the image signals supplied to the first and second groups is repeatedly inverted in the horizontal direction. delete A liquid crystal panel in which a liquid crystal cell is formed in an area defined by a plurality of gate lines and a plurality of data lines; A gate driver supplying a gate signal to the gate line; A data driver for supplying an image signal to the data line; And A timing controller controlling the gate and the data driver, The data driver supplies image signals of different polarities to the first group having two horizontally adjacent liquid crystal cells, and has the same polarity to the second group adjacent to the first group with two horizontally adjacent liquid crystal cells. Supplying an image signal, and supplying an image signal having a polarity opposite to that of the image signal supplied to the second group to a third group having one liquid crystal cell adjacent to the second group; The data driver includes: A shift register section for sequentially generating sampling signals, A latch unit for sequentially latching data from the timing controller according to the sampling signal; And a digital-to-analog converter for converting the latched data into image signals having polarities corresponding to the first to third groups according to the polarity control signal from the timing controller. Drive system. 5. The method of claim 4, The polarity of the image signals supplied to the first to third groups is inverted repeatedly in the horizontal direction. delete The method according to claim 1 or 4, Wherein the polarity of the image signal supplied to the second group is different from the polarity of the image signal supplied to the adjacent liquid crystal cells of the first group. The method according to claim 1 or 4, Wherein the polarity control signal is inverted every one horizontal period or two horizontal periods. The method according to claim 1 or 4, The digital-to-analog converter may include a first decoder to generate a positive image signal corresponding to the latched data, a second decoder to generate a negative image signal corresponding to the latched data, and the polarity control signal. And m (where m is a natural number) voltage converting unit comprising a selection unit for selectively outputting a positive or negative image signal. The method of claim 9, And the digital-to-analog converter further includes an inverter for inverting the polarity control signal and supplying the inverted polarity control signal to a selector of the even-numbered voltage converter of the m voltage converters. The method of claim 9, And the first and second decoders of the voltage converters supplying the image signal to the first group have the same order. The method of claim 9, And the first and second decoders of the voltage converters for supplying an image signal to the second group are in reverse order. The method of claim 9, The order of the first and second decoders of the voltage converter for supplying the image signal to the third group is the same as that of the voltage converter for supplying the image signal to the liquid crystal cells of the adjacent second group. Device. In the method of driving a liquid crystal panel in which a liquid crystal cell is formed in a region defined by a plurality of gate lines and a plurality of data lines, Supplying a gate signal to the gate line; And Supplying an image signal of different polarity to a first group having two horizontally adjacent liquid crystal cells, and supplying an image signal of the same polarity to a second group adjacent to the first group with two horizontally adjacent liquid crystal cells It comprises a second step of doing; The second step is Step 2-1 of sequentially generating sampling signals; Step 2-2 of sequentially latching input data according to the sampling signal; And And converting the latched data into an image signal having a polarity corresponding to each of the first and second groups in accordance with a polarity control signal. 15. The method of claim 14, And the polarity of the image signals supplied to the first and second groups in the second step is repeatedly reversed in the horizontal direction. delete In the method of driving a liquid crystal panel in which a liquid crystal cell is formed in a region defined by a plurality of gate lines and a plurality of data lines, Supplying a gate signal to the gate line; And Supplying an image signal of different polarity to a first group having two horizontally adjacent liquid crystal cells, and supplying an image signal of the same polarity to a second group adjacent to the first group with two horizontally adjacent liquid crystal cells And a second step of supplying an image signal having a polarity opposite to that of the image signal supplied to the second group to a third group having one liquid crystal cell adjacent to the second group; The second step is Step 2-1 of sequentially generating sampling signals; Step 2-2 of sequentially latching input data according to the sampling signal; And And converting the latched data into an image signal having a polarity corresponding to each of the first to third groups according to the polarity control signal. The method of claim 17, And the polarity of the image signals supplied to each of the first to third groups in the second step is repeatedly reversed in the horizontal direction. delete The method according to claim 14 or 17, And the polarity of the image signal supplied to the second group is different from the polarity of the image signal supplied to the adjacent liquid crystal cells of the first group. The method according to claim 14 or 17, And the polarity control signal is inverted every one horizontal period or two horizontal periods. The method according to claim 14 or 17, The second 2-3 steps, Generating a positive image signal corresponding to the latched data; Generating a negative image signal corresponding to the latched data; And And selectively outputting the positive or negative image signal according to the polarity control signal.

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