KR20080074375A - Liquid crystal display device and driving method thereof - Google Patents

Abstract

A liquid crystal display device and a method for driving the same are provided to reduce manufacturing cost by reducing the output channel number of a data driver. A liquid crystal display device includes a display unit(110) and a driving unit. The display unit has a plurality of pixel cells, which are formed on every region defined by a plurality of data lines and gate lines. The driving unit converts an input source data signal into an image signal, and provides the image signal to respective pixel cells. The driving unit provides a modulated image signal to a pixel cell among adjacent pixel cells in which a polarity of the image signal is changed. The driving unit includes a timing controller(140) aligning the source data signal to produce aligned data, a gate driver(120) sequentially driving gate lines, and a data driver(130) converting the aligned data into an image signal.

Description

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

1 is a view schematically showing a general liquid crystal display device.

2 is a schematic view of a liquid crystal display according to an exemplary embodiment of the present invention.

3 is a block diagram schematically illustrating a timing controller illustrated in FIG. 2.

4 is a block diagram schematically illustrating a data modulator shown in FIG. 3.

5 is a waveform diagram illustrating an image signal supplied to a pixel cell by a liquid crystal display and a driving method thereof according to an exemplary embodiment of the present invention.

6 is a schematic view of a liquid crystal display according to another exemplary embodiment of the present invention.

<Explanation of Signs of Major Parts of Drawings>

110: display unit 120: gate driver

130: data driver 140: timing control unit

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display, and more particularly, to a liquid crystal display and a driving method thereof capable of reducing the number of data lines and preventing a deterioration in image quality due to uncharging.

Recently, various flat panel displays have been introduced to reduce weight and volume, which are disadvantages of cathode ray tubes. The flat panel display includes a liquid crystal display, a field emission display, a plasma display panel, a light emitting display, and the like. Among such flat panel display devices, the liquid crystal display device displays an image by adjusting the light transmittance of the liquid crystal using an electric field.

1 is a view schematically illustrating a general liquid crystal display.

Referring to FIG. 1, a general liquid crystal display device includes a plurality of pixel cells formed for each region defined by a plurality of data lines DL and gate lines GL.

Each pixel cell has a pixel structure in the form of a vertical stripe in which pixel cells of red (R), green (G), and blue (B) are repeatedly arranged along the direction of the gate line GL. Here, the pixel cells of red (R), green (G), and blue (B) constitute a unit pixel for displaying one color image.

Each pixel cell includes a thin film transistor T connected to a data line DL and a gate line GL, and a pixel P connected to the thin film transistor T. The thin film transistor T is turned on according to the gate signal supplied to the gate line GL to supply the image signal supplied to the data line DL to the pixel P. The pixel P adjusts light transmittance according to an image signal supplied through the thin film transistor T.

In the general liquid crystal display, the thin film transistor T is turned on by the gate signal by sequentially supplying a gate signal to the gate lines GL and an image signal to the data line DL. The image signal supplied to the DL is supplied to the pixel P. Accordingly, each pixel cell displays a color image corresponding to the image signal by adjusting the light transmittance according to the image signal supplied to the pixel P. FIG.

However, since a general liquid crystal display has a pixel structure in the form of a vertical stripe, three data lines are required to drive a unit pixel. Accordingly, there is a problem in that the number of output channels of the data driver for supplying the image signal to the data line increases, thereby increasing the manufacturing cost.

Accordingly, in order to solve the above problems, the present invention is to provide a liquid crystal display and a driving method thereof to reduce the number of data lines and to prevent image degradation due to uncharged.

According to an exemplary embodiment of the present invention, a liquid crystal display is formed for each region defined by a plurality of data lines and gate lines, and may be blue, green, and red along a direction of the data line. A display unit having a plurality of pixel cells that are repeatedly arranged and have the same color disposed in a direction of the gate line; And a driving unit which converts an input source data signal into an image signal and supplies the converted image signal to each pixel cell, and supplies a modulated image signal to a pixel cell whose polarity of the image signal is changed among adjacent pixel cells in a direction of the data line. Characterized in that it comprises a.

The driving unit inverts the polarity of the image signal supplied to the pixel cell in units of j (where j is a natural number of 2 or more) along the direction of the data line, and modulates the first pixel cell of the j pixel cells. The image signal is supplied, and the first pixel cell is any one of blue, green, and red pixel cells.

The driving method of the liquid crystal display according to the exemplary embodiment of the present invention is formed for each region defined by a plurality of data lines and gate lines, and blue, green, and red are repeatedly arranged along the direction of the data line. Converting an input source data signal into an image signal, the display unit including a display unit having a plurality of pixel cells having the same color disposed along a direction of the gate line; And supplying the image signal to each pixel cell of the horizontal line corresponding to the direction of the gate line, wherein the pixel cell of which the polarity of the image signal is changed is changed among the pixel cells adjacent to the data line. The modulated image signal is supplied.

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

2 is a diagram schematically illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the liquid crystal display according to the first exemplary embodiment of the present invention is formed for each region defined by the plurality of data lines DL and the gate lines GL, and the direction of the data line (vertical direction). Display unit 110 having a plurality of pixel cells 112 in which blue (B), green (G), and red (R) are repeatedly arranged, and the same color is disposed along the direction of the gate line (horizontal direction). ; And a driving unit for converting an input source data signal into an image signal and supplying it to each pixel cell 112 and supplying a modulated image signal to a pixel cell whose polarity of the image signal is changed among adjacent pixel cells in the direction of the data line. It is configured to include.

The display unit 110 includes a plurality of data lines DL formed side by side at regular intervals; A plurality of gate lines GL formed side by side at regular intervals so as to cross each data line DL; And a plurality of pixel cells 112 formed for each area defined by the data lines DL and the gate lines GL.

Each pixel cell 112 has blue (B), green (G), and red (R) pixel cells 112 repeatedly arranged along the direction of the data line DL and the same color along the direction of the gate line. Is placed. Accordingly, the display unit 110 has a pixel structure in the form of a horizontal stripe. Such pixel cells 112 of blue (B), green (G), and red (R) constitute a unit pixel for displaying one color image.

Each pixel cell 112 includes a thin film transistor T connected to a data line DL and a gate line GL; And the pixel P connected to the thin film transistor T. As shown in FIG. The thin film transistor T is turned on according to the gate-on voltage supplied from the gate line GL to supply the image signal supplied from the data line DL to the pixel P. The pixel P is composed of a pixel electrode connected to the common electrode and the thin film transistor TFT with the liquid crystal interposed therebetween, so that the pixel P may be equivalently represented as a liquid crystal capacitor. In addition, each pixel cell 112 includes a storage capacitor (not shown) for maintaining the image signal charged in the liquid crystal capacitor until the next image signal is charged.

On the other hand, in the display unit 110, pixel cells of blue (B), green (G), red (R), and white (W) are repeatedly arranged along the direction of the data line DL and along the direction of the gate line. Pixel cells of the same color may be arranged. In this case, a corresponding color filter is formed in each of the pixel cells of blue (B), green (G), and red (R), whereas no color filter is formed in the white (W) pixel cell. Hereinafter, it is assumed that each unit pixel includes pixel cells 112 of blue (B), green (G), and red (R).

The driving unit generates the alignment data B, G, and R by aligning the source data signal Data, and modulates the alignment data B corresponding to the pixel cell 112 in which the polarity of the image signal is changed. A timing controller 140 for generating (MB); A gate driver 120 sequentially driving the gate lines GL according to the gate control signal GCS supplied from the timing controller 140; And converting the alignment data G and R supplied from the timing controller 140 into an image signal according to the data control signal DCS supplied from the timing controller 140 and supplying the image data to the data lines DL or modulating data ( And a data driver 130 for converting the MB into a modulated image signal and supplying it to the data lines DL.

The timing controller 140 controls the first to third horizontal sections to supply an image signal to each of the pixel cells 112 of blue (B), green (G), and red (R), which are the unit pixels, during the one horizontal section. Each of the gates and the data drivers 120 and 130 is time-divided into sub-divisions so that the image corresponding to each sub-division is displayed on the display unit 110.

To this end, the timing controller 140 may include gate and data control signal generators 200 and 210 as shown in FIG. 3; It is configured to include a data aligning unit 220 and a data modulator 230.

The gate control signal generator 200 uses at least one of an external dot clock DCLK, a data enable signal DE, and vertical and horizontal sync signals Vsync and Hsync to each horizontal section of the display 110. Each time, a gate control signal GCS for supplying a gate-on voltage is generated. In this case, the gate control signal GCS is for controlling the driving timing of the gate driver 120 and includes a gate start pulse GSP, a gate shift clock GSC, and a gate output enable GOE.

The data control signal generator 210 uses at least one of an external dot clock DCLK, a data enable signal DE, and vertical and horizontal synchronization signals Vsync and Hsync to each horizontal section of the display 110. Each time, a data control signal DCS for supplying an image signal is generated. In this case, the data control signal DCS is for controlling the driving timing of the data driver 130, and the source output enable SOE, the source shift clock SSC, the source start pulse SSP, and the polarity control signal POL. And the like. Here, the polarity control signal POL is inverted in units of three horizontal lines.

The data aligning unit 220 aligns the source data signal Data supplied from the outside in units of one horizontal section into blue, green, and red data B, G, and R so as to correspond to each of the first to third subsections. . At this time, the blue data B of the source data signal Data is aligned in the first subdivision, the green data G is aligned in the second subdivision, and the red data R is aligned in the third subdivision. .

The data modulator 230 modulates the blue alignment data B among the alignment data B, G, and R supplied from the data alignment unit 220 and supplies the modulated blue alignment data B to the data driver 130. And red alignment data R are bypassed to the data driver 130. That is, the data modulating unit 230 is a blue (B) pixel whose polarity is changed among the image signals supplied to the pixel cells 112 of blue (B), green (G), and red (R) constituting the unit pixel. Modulate the data supplied to the cell.

To this end, the data modulator 230 includes a counter 232 as shown in FIG. 4; Selector 234; Memory 236; And a lookup table 238.

The counter 232 counts the source output enable (SOE) supplied from the data control signal generator 210 to determine the horizontal detection signal corresponding to the 3i-2 (where i is a natural number) th horizontal section of each subdivision. HS). That is, the counter 232 generates the horizontal detection signal HS of the first logic state when the source output enable SOE corresponds to the 3i-2th horizontal section, and otherwise detects the horizontal state of the second logic state. Generate signal HS.

The selector 234 stores the blue alignment data B of the alignment data B, G, and R supplied from the data alignment unit 220 according to the horizontal detection signal HS from the counter 232. And the lookup table 238 or green and red alignment data G and R to the data driver 130. That is, the selector 234 supplies the blue alignment data B to the memory 236 and the lookup table 238 in accordance with the horizontal detection signal HS of the first logic state, and detects the detection signal of the second logic state. HS and green alignment data G and R are supplied to the data driver 130 according to HS).

The memory 236 stores the blue alignment data B supplied from the selector 234. That is, the memory 236 stores the blue alignment data B, and supplies the stored blue alignment data B to the lookup table 238. At this time, the blue alignment data B supplied from the memory 236 to the lookup table 238 is data of a previous subsection.

The lookup table 238 compares the blue alignment data B of the current and previous subsections supplied from the selector 234 and the memory 236, modulates the blue alignment data B of the current subsection, and modulates the blue modulation data. Create (MB). To this end, in the lookup table 238, modulation data MB corresponding to a change in the blue alignment data B of the current and previous subsections is registered in order to speed up the charging characteristic of the pixel cell 212.

In FIG. 2, the gate driver 120 generates a gate-on voltage according to the gate control signal GCS of each sub-section supplied from the timing controller 140 and sequentially supplies the gate-on voltage to the gate lines GL. Accordingly, the gate lines GL of the display unit 110 are sequentially driven by the gate-on voltage from the gate driver 120. The gate driver 120 may be formed on a substrate on which the display unit 110 is formed at the same time as the manufacturing process of the thin film transistor and may be connected to the gate line GL.

The data driver 130 converts the data MB, G, and R into an image signal, which is an analog signal, by using the data control signal DCS supplied from the timing controller 140 according to each subdivision, thereby providing each data line ( DL). In this case, the data driver 130 inverts the polarity of the image signal in units of three pixel cells along the direction of the data line DL according to the polarity control signal POL of the data control signal DCS, and the gate line ( Inverted by one pixel cell along the direction of GL).

5 is a view for explaining a method of driving a liquid crystal display according to a first embodiment of the present invention.

5 to 4, a liquid crystal display and a driving method thereof according to the first exemplary embodiment of the present invention will be described.

First, in the first sub-section ST1 of the first horizontal section H1, the data modulating unit 230 modulates the data lines DL to be synchronized with the supply of the gate-on voltage to the first gate line GL1. The positive polarity (+) blue image signal MPVb is supplied. Accordingly, the pixel cells of each blue color B of the first horizontal line display a blue image corresponding to the modulated positive blue image signal MPVb.

Subsequently, in the second sub-section ST2 of the first horizontal section H1, the data modulator 230 is applied to the data lines DL to be synchronized with the supply of the gate-on voltage to the second gate line GL2. The positive green image signal PVg to be passed is supplied. Accordingly, the pixel cells of each green color G of the second horizontal line display a green image corresponding to the positive green image signal PVg.

Subsequently, in the third sub-section ST3 of the first horizontal section H1, the data modulator 230 is connected to the data lines DL to be synchronized with the supply of the gate-on voltage to the third gate line GL3. The positive red image signal PVr to be passed is supplied. Accordingly, the pixel cells of each red color R of the third horizontal line display a red image corresponding to the positive red color image signal PVr.

In the first horizontal section H1, a desired color image is displayed on one unit pixel by mixing blue, green, and red images displayed in each of the first to third subsections ST1 to ST3.

Subsequently, in the first sub-section ST1 of the second horizontal section H2, the data modulating unit 230 modulates the data lines DL to be synchronized with the supply of the gate-on voltage to the fourth gate line GL4. The negative (-) blue image signal MNVb is supplied. Accordingly, the pixel cells of each blue color B of the fourth horizontal line display a blue image corresponding to the modulated negative blue image signal MNVb.

Subsequently, in the second sub-section ST2 of the second horizontal section H2, the data modulator 230 is applied to the data lines DL to be synchronized with the supply of the gate-on voltage to the fifth gate line GL5. The negative green image signal NVg which is passed is supplied. Accordingly, the pixel cells of each green color G of the fifth horizontal line display a green image corresponding to the negative green image signal NVg.

Subsequently, in the third sub-section ST3 of the second horizontal section H2, the data modulator 230 is applied to the data lines DL to be synchronized with the supply of the gate-on voltage to the sixth gate line GL6. The bypassed negative red image signal NVr is supplied. As a result, the pixel cells of each red color R in the sixth horizontal line display the red color image corresponding to the negative red color image signal NVr.

In the second horizontal section H2, a desired color image is displayed on one unit pixel by mixing blue, green, and red images displayed in each of the first to third sub-sections ST1 to ST3.

Similarly, each pixel cell of each horizontal section after the second horizontal section is supplied with an image signal having the same polar pattern as the above-described order of the first and second horizontal sections.

The liquid crystal display and the driving method thereof according to the first exemplary embodiment of the present invention provide a plurality of pixel cells in which three colors are repeatedly arranged along the direction of the data line and the same color is disposed along the direction of the gate line. By reducing the number of data lines by 1/3, the number of output channels of the data driver 130 may be reduced by 1/3 to reduce manufacturing costs. Here, the number of gate lines is increased by three times instead of reducing the number of data lines by one third, but the configuration of the gate driver 120 driving the gate line is relatively simple compared to the configuration of the data driver 130. Therefore, the manufacturing cost is not greatly affected. On the other hand, when the gate driver 120 is formed on the substrate at the same time as the manufacturing process of the thin film transistor as described above, no additional cost is incurred.

In addition, the liquid crystal display according to the first exemplary embodiment of the present invention and a driving method thereof according to an embodiment of the present invention include three pixel cells along the direction of the data line DL and one pixel cell along the direction of the gate line GL. Pixel cells constituting the unit pixel by inverting the polarity of the signal and modulating the data supplied to the blue pixel cell B to make the liquid crystal response speed of the blue pixel cell B faster than the other pixel cells G and R. The charging characteristic of the blue pixel cell B in which polarity inversion of the image signal is generated can be improved. Accordingly, the present invention can prevent the deterioration of image quality due to uncharged blue pixel cells.

6 is a schematic view of a liquid crystal display according to a second exemplary embodiment of the present invention.

Referring to FIG. 6, the liquid crystal display according to the second exemplary embodiment of the present invention is formed for each area defined by the plurality of data lines DL and the gate lines GL, and the direction of the data line (vertical direction). A display unit 310 having a plurality of pixel cells in which red (R), green (G), and blue (B) are repeatedly arranged, and the same color is disposed along a direction of a gate line (horizontal direction); And a driving unit for converting an input source data signal into an image signal and supplying it to each pixel cell 312, and supplying a modulated image signal to a pixel cell whose polarity of the image signal is changed among adjacent pixel cells in the direction of the data line. It is configured to include.

Since the liquid crystal display according to the second exemplary embodiment of the present invention has the same structure as the liquid crystal display according to the first exemplary embodiment of the present invention except for the pixel arrangement of the display unit 310, a description of the same configuration will be omitted. The description will be replaced with the above description.

The display unit 310 includes a plurality of data lines DL formed side by side at regular intervals; A plurality of gate lines GL formed side by side at regular intervals so as to cross each data line DL; And a plurality of pixel cells 312 formed for each region defined by the data lines DL and the gate lines GL.

Each pixel cell 312 has red (R), green (G), and blue (B) pixel cells (R, G, B) repeatedly arranged along the direction of the data line (DL), and the direction of the gate line. Are arranged in the same color along. Accordingly, the display unit 310 has a pixel structure in the form of a horizontal stripe. Such pixel cells 312 of red (R), green (G), and blue (B) constitute a unit pixel for displaying one color image.

Similarly, in the liquid crystal display according to the third exemplary embodiment of the present invention, the display unit is formed for each region defined by the plurality of data lines DL and the gate lines GL, and the direction of the data line (vertical direction). A display unit having a plurality of pixel cells in which green (G), blue (B), and red (R) are repeatedly arranged, and the same color is disposed along a direction of a gate line (horizontal direction); And a driving unit for converting an input source data signal into an image signal and supplying it to each pixel cell, and supplying a modulated image signal to a pixel cell whose polarity of the image signal is changed among adjacent pixel cells in the direction of the data line. do.

On the other hand, the liquid crystal display and the driving method thereof according to an embodiment of the present invention, the polarity of the image signal in units of one pixel cell along the direction of the two pixel cells and the gate line GL in the direction of the data line DL In addition to this, the data to be supplied to each pixel cell of the odd-numbered horizontal line where polarity inversion of the image signal is generated can be modulated.

As a result, the liquid crystal display and the driving method thereof according to the exemplary embodiment of the present invention described above include at least j (where j is a natural number of two or more) pixel cells and gate lines GL along the direction of the data line DL. By inverting the polarity of the image signal in units of one pixel cell and modulating the data to be supplied to the first pixel cell among the j pixel cells, the same effect as that of the liquid crystal display according to the first embodiment of the present invention is achieved. Can provide.

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and it is understood that various substitutions, modifications, and changes, such as pixel arrangement and polarity inversion, may be made without departing from the technical spirit of the present invention. It will be apparent to those of ordinary skill in the art to which the invention pertains.

The liquid crystal display and the driving method thereof according to the embodiment of the present invention as described above include a plurality of pixel cells in which at least three colors are repeatedly arranged along the direction of the data line and the same colors are arranged along the direction of the gate line. As a result, the number of data lines can be reduced by one third, and the number of output channels of the data driver can be reduced by one third, thereby reducing manufacturing costs.

In addition, the present invention inverts the polarity of the image signal in units of at least j pixel cells (j is a natural number of 2 or more) along the direction of the data line, and modulates the data to be supplied to the first pixel cell of the j pixel cells. As a result, deterioration in image quality due to uncharged pixel cells can be prevented.

Claims (17)

It is formed for each area defined by a plurality of data lines and gate lines, and a plurality of blue, green, and red colors are repeatedly arranged along the direction of the data line and the same color is disposed along the direction of the gate line. A display unit having pixel cells; And A driver for converting an input source data signal into an image signal and supplying it to each pixel cell, and supplying a modulated image signal to a pixel cell whose polarity of the image signal is changed among adjacent pixel cells in a direction of the data line; Liquid crystal display characterized in that the configuration. The method of claim 1, The driving unit inverts the polarity of the image signal supplied to the pixel cell in units of j (where j is a natural number of 2 or more) along the direction of the data line, and modulates the first pixel cell of the j pixel cells. The liquid crystal display device which supplies an image signal. The method of claim 2, And the first pixel cell is any one of blue, green and red pixel cells. The method of claim 2, And the driver inverts the polarity of the image signal by one pixel cell along the direction of the gate line. The method of claim 4, wherein The driving unit, A timing controller for generating alignment data by aligning the source data signal and modulating the alignment data corresponding to the pixel cell whose polarity of the image signal is changed; A gate driver sequentially driving the gate lines according to a gate control signal supplied from the timing controller; And According to a data control signal supplied from the timing controller, the alignment data supplied from the timing controller is converted into an image signal and supplied to the data lines, or the modulation data is converted into the modulated image signal to the data lines. A liquid crystal display comprising a data driver for supplying. The method of claim 5, wherein The timing controller, A data alignment unit for time division of one horizontal section into first to third sub sections, and sorting the source data signal with the alignment data so as to correspond to each of the sub sections; A gate control signal generator configured to generate the gate control signal for sequentially driving the gate lines in each of the sub-sections; A data control signal generation unit configured to generate the data control signal including a source output enable for supplying the image signal to the data lines in synchronization with driving of the gate line; And And a data modulator for bypassing the alignment data to the data driver or modulating the alignment data to the modulation data according to the source output enable and supplying the alignment data to the data driver. The method of claim 6, The data modulator, A counter for counting the source output enable to generate a horizontal detection signal of a first logic state for every j subdivisions, and to generate a horizontal detection signal of a second logic state for the remaining subdivisions except for the j subdivisions; A memory for storing the alignment data; A selection unit which supplies the alignment data to the memory according to the horizontal detection signal of the first logic state or the alignment data to the data driver according to the horizontal detection signal of the second logic state; And The modulation data is generated by comparing the alignment data of the current subdivision supplied from the selection unit with the alignment data of the previous subdivision supplied from the memory by the horizontal detection signal of the first logic state, and generating the generated modulation data. And a lookup table for supplying the data driver. The method of claim 7, wherein And the modulation data corresponding to a change in alignment data of the current and previous subdivisions are listed in the lookup table to accelerate charging characteristics of the pixel cells. It is formed for each area defined by a plurality of data lines and gate lines, and a plurality of blue, green, and red colors are repeatedly arranged along the direction of the data line and the same color is disposed along the direction of the gate line. A display unit having pixel cells, Converting an input source data signal into an image signal; And And supplying the image signal to each pixel cell of the horizontal line corresponding to the direction of the gate line. And a modulated image signal is supplied to a pixel cell of which the polarity of the image signal is changed among the pixel cells adjacent in the direction of the data line. The method of claim 9, And the polarity of the image signal is inverted in units of j (where j is a natural number of two or more) along the direction of the data line. The method of claim 10, And a modulated image signal is supplied to a first pixel cell of the j pixel cells. The method of claim 11, wherein And the first pixel cell is any one of blue, green, and red pixel cells. The method of claim 11, wherein And the polarity of the image signal is inverted by one pixel cell along the direction of the gate line. The method of claim 13, Converting the source data signal into an image signal; A first step of time-dividing one horizontal section into first to third subdivisions, and aligning the source data signal to correspond to each subdivision to generate alignment data; Generating modulated data by modulating the alignment data according to a source output enable for supplying the image signal to the data lines; And And a third step of converting the alignment data into the image signal or converting the modulated data into the modulated image signal. The method of claim 14, The second step; Counting the source output enable to generate a horizontal detection signal of a first logic state for every j subdivisions, and generating a horizontal detection signal of a second logic state to subregions other than the j subdivisions; Selectively outputting the alignment data according to the horizontal detection signal; Storing the alignment data selected in accordance with the horizontal detection signal of the first logic state in the memory; And generating the modulation data by comparing the alignment data of the current subdivision selected in accordance with the horizontal detection signal of the first logic state with the alignment data of the previous subdivision stored in the memory. How to drive tooth. The method of claim 15, The generating of the modulation data may include changing a gray value of the alignment data to correspond to a change in alignment data of the current and previous subdivisions in order to increase the charging characteristics of the pixel cell. Way. The method of claim 15, The third step; Converting the alignment data selected according to the horizontal detection signal of the second logic state into the image signal; And And converting the modulated data selected and modulated according to the horizontal detection signal of the first logic state into the image signal.

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