TWI417862B - Liquid crystal display and driving method thereof - Google Patents

Description

Liquid crystal display and driving method thereof

The present invention relates to a liquid crystal display and a method of driving the same.

The liquid crystal in the liquid crystal display itself does not have a light-emitting property. Therefore, in order to achieve the display effect, it is necessary to provide a light source device such as a backlight module to the liquid crystal display panel to realize the display function.

In recent years, the optoelectronic industry has developed. Light Emitting Diode (LED) has been widely used as a backlight module for liquid crystal displays due to its small size, low energy consumption, high brightness, long life and stable illumination. light source. Among them, the application of white light emitting diodes is more common.

The commonly used white light emitting diodes generally include a light emitting chip and a sealant having a phosphor powder, and the light emitted from the light emitting chip excites the phosphor powder to generate white light. White light-emitting diodes are usually produced and produced in batches. However, the same batch of light-emitting diodes or different batches of light-emitting diodes often have different chromaticities due to process limitations. For example, some white light-emitting diodes have different light-emitting polarities. Blue, some are yellowish. The industry generally defines the chromaticity with a chromaticity coordinate system, and according to the chromaticity of the white light emitting diode, the chromaticity coordinate system is divided into a plurality of chromaticity regions, and the white light emitting diodes of the same chromaticity region are similar in chromaticity. The white light emitting diodes of different chromaticity regions have large differences in chromaticity.

The backlight module of the liquid crystal display uses a plurality of white light emitting diodes in a first chromaticity region as a light source, and the color representation of a plurality of white light emitting diodes in a second chromaticity region as a light source is different, and plural In the chromaticity area, white light-emitting diodes with only one or two chromaticity regions will achieve better color performance when combined with a liquid crystal display panel, and white light-emitting diodes of other chromaticity regions are matched with a liquid crystal display panel. The phenomenon of color cast will appear on the screen, for example, its all white screen is bluish or yellowish, which greatly affects the display effect of the liquid crystal display.

In view of this, it is necessary to provide a liquid crystal display that effectively improves the color cast phenomenon of the entire white screen.

At the same time, it is also necessary to provide a driving method of a liquid crystal display which effectively improves the color cast phenomenon of the entire white screen.

A liquid crystal display comprising a comparison selection circuit, a gray scale correction circuit, a data processor and a liquid crystal display panel, wherein the comparison selection circuit is configured to receive picture data and determine whether the picture material represents an all white picture, when When the picture data represents a non-white screen, the comparison selection circuit directly outputs the picture data to the data processor; when the picture data represents an all white picture, the gray level correction circuit outputs a corrected picture data to the comparison selection circuit. And the comparison selection circuit outputs the correction picture data to the data processor, and the data processor generates a gray scale voltage according to the picture data outputted by the comparison selection circuit or the corrected picture data, and the gray level voltage is supplied to the liquid crystal display panel.

A driving method of a liquid crystal display, comprising the following steps:

Determine whether the screen material represents a full white screen;

When the picture data represents a non-full white picture, the picture data is processed; when the picture data represents an all white picture, a corrected picture data is provided, and the corrected picture data is processed. The corrected picture data is calculated according to an actual chromaticity value of the liquid crystal display, a critical chromaticity coordinate of the chromaticity region in which the actual chromaticity value is located, and a preset gradation corresponding to each critical color coordinate.

Compared with the prior art, in the liquid crystal display of the present invention, when the picture data represents an all white picture, the gray level correction circuit outputs the modified picture data to the data processor, and the data processor outputs gray scale according to the corrected picture data. Voltage to achieve display of the liquid crystal display panel. That is, when the actual chromaticity value of the liquid crystal display is not within the specified range, the gray scale voltage is corrected by correcting the screen data, and the light mixing ratio of the red, green, and blue pixels in the liquid crystal display is changed, thereby improving the color cast of the all white screen. phenomenon.

Compared with the prior art, in the driving method of the liquid crystal display of the present invention, when the picture data represents an all white picture, the corrected picture data is provided and converted into a gray scale voltage to realize display. That is, when the actual chromaticity value of the liquid crystal display is not within the specified range, the grayscale voltage is corrected by correcting the picture data, and the light mixing ratio of the red, green, and blue pixels in the liquid crystal display is changed, thereby improving the color cast of the all white image. phenomenon.

Please refer to FIG. 1, which is a circuit block diagram of a first embodiment of a liquid crystal display of the present invention. The liquid crystal display 1 includes a liquid crystal display panel 10, a comparison selection circuit 11, a gray scale correction circuit 12, and a data processor 13. The comparison selection circuit 11 is configured to receive picture data (RGB Data) representing the gray level of the display screen, and determine whether the picture material represents an all-white picture. When the picture data represents a non-full white picture, the picture data is output. To the data processor 13. The gray scale correction circuit 12 outputs a corrected screen data when the screen data represents an all white screen, and the corrected screen data is output to the material processor 13. The data processor 13 converts the received picture data or the corrected picture data into gray scale voltages and generates other display driving signals, and outputs the gray scale voltage and the complex display driving signals to the liquid crystal display panel 10, so that the liquid crystal display The panel 10 displays a picture.

The comparison selection circuit 11 includes a data latch 111, a comparator 112, and a selection circuit 113. The data latch 111 temporarily stores the received picture data and sequentially outputs the picture data to the comparator 112. The comparator 112 determines whether the picture data represents an all white picture. When the picture data represents a non-full white picture, it outputs a first control signal to the selection circuit 113; when the picture data represents a full white picture And outputting a second control signal to the selection circuit 113. When the selection circuit 113 receives the first control signal, it provides the picture material to the data processor 13. The selection circuit 113 can be a multiplex selector.

The gray scale correction circuit 12 includes a first memory 121, a second memory 122, a calculation unit 123, and an output unit 124. Please also refer to FIG. 2, FIG. 2 is a chromaticity area division diagram of the white light emitting diode under the definition of the chromaticity coordinate system, wherein, under the coordinate system, a total of eleven chromaticity regions F1 as shown in the figure are divided. , G1, H, I, J1 and M, N, O, P, Q, R. Each chrominance region has a substantially parallelogram and includes four critical chromaticity coordinates, such as four critical color coordinates Aj (Xaj, Yaj), Bj (Xbj, Ybj), Cj (Xcj, Ycj) of the chromaticity region J1. ), Dj (Xdj, Ydj).

The first memory 121 stores a chrominance value, which is measured by the color metric measuring instrument when the liquid crystal display 1 displays an all white screen and the image data representing the full white screen is not corrected. The chromaticity coordinates (X0, Y0) of the all-white picture, which can be measured during the manufacture or testing of the liquid crystal display 1. Since the chromaticity value is measured when the liquid crystal display 1 displays an all white screen and the picture data representing the all white screen is not corrected, the chromaticity value may be defined as an actual chromaticity value of the liquid crystal display 1, And the actual chromaticity value is related to which white light emitting diode system of the chromaticity region of the backlight module of the liquid crystal display 1 is used. Generally, when the chromaticity value is not in a certain chromaticity region, the all white screen of the liquid crystal display 1 has a color cast.

The second memory 122 stores four critical color coordinates corresponding to each chrominance region and a preset modified gray scale corresponding to each of the critical color coordinates. The number of the complex chrominance regions may be determined according to actual needs. For example, when the chrominance value in the first memory 121 is determined to be changed only in the first and second chrominance regions, the second memory 122 only needs to be And storing the first and second chrominance regions and the first and second chrominance regions respectively corresponding to the critical chromaticity coordinates.

Each preset correction gray scale includes a red correction gray scale, a blue correction gray scale, and a green correction gray scale. The red corrected gray scale, the blue corrected gray scale, and the green corrected gray scale are when the actual chroma value of the display is located at the critical color coordinate, and the red corrected gray scale, the blue corrected gray scale, and the green corrected gray scale are applied. Eliminate the grayscale value of the color cast of the display. The specific description is as follows: if the actual chromaticity value of the display is located at a critical color coordinate Aj point of the chromaticity area J1, the red gray scale, the blue gray scale and the green gray scale applied to the display panel for displaying the all white screen are 255 gray scale, the display has a color cast phenomenon; and the actual chromaticity value of the display is located at any point of the chromaticity area H, and the red gray scale, the blue gray scale and the green gray scale applied to the display panel are 255 gray In order, the display has no color cast phenomenon on the entire white screen. Then, when the full white screen is displayed on the display, after applying the red correction gray scale, the blue correction gray scale and the green correction gray scale corresponding to the Aj point, the display will have no color cast phenomenon, that is, the red correction gray is applied. After the order, the blue corrected gray scale and the green corrected gray scale, the measured chromaticity value measured again is located in the chromaticity area H, and preferably located at the critical color coordinate Aj of the chromaticity area H and the chromaticity area J1. Point corresponds to the Ah point. Therefore, the red corrected gray scale, the blue corrected gray scale and the green corrected gray scale corresponding to each critical color coordinate can be obtained through experiments or calculations using the above principle, and each of the critical color coordinates corresponds to the red corrected gray scale, blue The color correction gray scale and the green correction gray scale may not be unique. For example, the red color correction gray scale, the blue correction gray scale, and the green correction gray scale corresponding to the critical color coordinate Aj point may be 220, 255, 222, or may be 221 , 254, 220.

The calculating unit 123 is configured to calculate the corrected image data of the all white screen according to the chromaticity value, the four critical color coordinates of the chromaticity region in which the chromaticity value is located, and the preset modified gray scale corresponding to each critical color coordinate. It includes a correction method for the picture data. Since the picture data generally includes red data (R Data), green picture data (G Data), and blue picture data (B Data), the computing unit 123 can correspond to three types of red, green, and blue picture materials. The picture data correction formula, of course, when a certain picture material in the red, green, and blue picture data does not need to be corrected, the calculation unit may also include only two other picture data correction formulas. The red, green and blue picture data correction formula is as follows:

Where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; r1, r2, r3, r4 respectively represent four critical chromaticity coordinates to the actual chromaticity value (X0, Y0) Distance (a formula that can pass the distance between two points in the coordinate system) Obtained; R1, R2, R3, and R4 represent the red corrected gray scales in the preset modified gray scales of the four critical chromaticity coordinates respectively; G1, G2, G3, and G4 represent preset corrections of the four critical chromaticity coordinates, respectively. The green corrected gray scale in the gray scale; B1, B2, B3, and B4 respectively represent the blue corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates.

The output unit 124 outputs the corrected picture material to the selection circuit 113. When the selection circuit 113 receives the second control signal, it supplies the corrected picture material to the data processor 13.

Please refer to FIG. 3 , which is a flowchart of a driving method of the liquid crystal display 1 . The working principle of the liquid crystal display 1 is detailed as follows:

(1) Determine whether the screen data represents a full white screen. The specific steps are as follows:

The data latch 111 receives and temporarily stores the picture data, and sequentially outputs each picture data to the comparator 112, wherein the picture data can be a low voltage differential signal. The comparator 112 determines whether the received picture material is an all-white picture material. Wherein, the red, green and blue picture data in the picture data simultaneously meet the following conditions: red picture data R=255 gray level, green picture data R=255 gray level, blue picture data R=255 gray level, the picture The data represents a full white screen data; when at least one of the red, green and blue picture data in the picture data is not equal to 255 gray level, the picture data represents a non-full white picture material.

(2) When the screen data represents a non-full white screen, data processing is performed on the screen data; when the screen data represents an all white screen, a corrected screen data is provided, and data processing is performed on the corrected image data. The modified picture data is calculated according to an actual chromaticity value of the liquid crystal display, a critical chromaticity coordinate of the chromaticity region in which the actual chromaticity value is located, and a preset gradation corresponding to each critical color coordinate. Specific steps are as follows:

When the picture data is a non-full white picture material, the comparator 112 outputs a first control signal to the selection circuit 113. When the picture data is an all-white picture data, the comparator 112 outputs a second control signal to the selection circuit 113.

The first memory 121 supplies the chromaticity value stored therein to the second memory 122. The second memory 122 queries, according to the chromaticity value, four critical chromaticity coordinates of the chromaticity region in which the chromaticity value is located and a preset modified grayscale corresponding to each of the critical color coordinates. The chromaticity value, the four critical chromaticity coordinates of the chromaticity region, and the preset modified grayscale corresponding to each of the critical color coordinates are output to the calculating unit 123, and the calculating unit 123 calls the The three picture data correction formulas respectively calculate the picture correction data, namely: red picture correction data, green picture correction data and blue picture correction data. Wherein, when the present invention preferably corrects the red picture data and the blue picture data, the calculation unit internally includes a red picture data correction formula and a blue picture data correction formula, and the red picture correction data and the blue picture correction data are obtained in the calculation unit 123. After that, the calculating unit 123 directly outputs the red picture correction data, the green picture data, and the blue picture correction data to the output unit 124, wherein the green picture material is not actually corrected, and is 255 gray levels. The output unit 124 outputs the corrected picture data received thereto to the selection circuit 113.

When the selection circuit 113 receives the first control signal, the comparator 112 determines that the picture data represents a non-full white picture, and the selection circuit 113 directly supplies the picture data provided by the data latch 111 to the data processing. 13. When the selection circuit 113 receives the second control signal, the comparator 112 determines that the picture data represents an all-white picture, and the selection circuit 113 provides the corrected picture data output by the output unit 124 of the gray-scale correction circuit to the Data processor 13.

The processing of the data on the screen data or the modified screen data includes: converting the screen data or the corrected image data into a grayscale voltage, and generating other display driving signals to realize screen display. Specific steps are as follows:

The data processor 13 generates gray scale voltages and complex display driving signals (eg, scanning voltage signals, common voltage signals, clock control signals, etc.) according to the received picture data or corrected picture data, and the gray scale voltage and the complex display driving signals It is output to the liquid crystal display panel 10, and the liquid crystal display panel 10 displays a screen.

Compared with the prior art, the liquid crystal display 1 of the present invention determines whether the picture material represents an all-white picture by the comparison selection circuit 11, and when the picture data represents an all-white picture, the gray-scale correction circuit 12 is based on the actuality of the liquid crystal display 1. The chromaticity value, the critical chromaticity coordinate of the chromaticity region in which the actual chromaticity value is located, and the preset gradation corresponding to each of the critical color coordinates are used to calculate the corrected picture data, and the data processor 13 according to the correction picture The data output gray scale voltage and other display driving signals are used to realize the display of the liquid crystal display panel 10. That is, when the actual chromaticity value of the liquid crystal display 1 is not within the predetermined range, the red, green, and blue picture data are corrected by correcting the red, green, and blue picture data, and the red, green, and blue pixels are changed. The light mixing ratio improves the color cast of the all-white picture.

Please refer to FIG. 4, which is a circuit block diagram of a second embodiment of the liquid crystal display of the present invention. The difference between the liquid crystal display 2 of the embodiment and the liquid crystal display 1 of the first embodiment is that the grayscale correction circuit 22 includes a third memory 225, and the third memory 225 stores the corrected image data, and the modified image data includes Red screen correction data, green screen correction data, and blue screen correction data. The correction picture data is the same as the modified picture data in the first embodiment, according to the actual chromaticity value of the liquid crystal display 1, the critical chromaticity coordinates of the chromaticity region and the corresponding chromaticity coordinates corresponding to the actual chromaticity value. The preset correction gray scale is calculated, and the third memory 225 can be written during the manufacturing or testing of the liquid crystal display 2. When the comparison selection circuit 21 judges that the picture material represents the all-white picture, the corrected picture material in the third memory 225 is supplied to the material processor 23.

The liquid crystal display 2 is structurally simpler than the liquid crystal display 1 of the first embodiment.

Please refer to FIG. 5, which is a circuit block diagram of a third embodiment of the liquid crystal display of the present invention. The main difference between the liquid crystal display 3 of the embodiment and the liquid crystal display 1 of the first embodiment is that the gray scale correction circuit 32 includes a fourth memory 326, a calculation unit 323, and an output unit 324; the liquid crystal display 3 further includes a chroma Detection circuit 34. The fourth memory 326 is the same as the second memory 122 in the first embodiment, and the calculation unit 323 and the output unit 324 are also the same as the calculation unit 123 and the output unit 124 in the first embodiment. The chromaticity detecting circuit 34 is electrically connected to the fourth memory 326 for detecting an actual chromaticity value of the liquid crystal display 3 and outputting the chromaticity value to the grayscale correcting circuit 32.

Compared with the liquid crystal display 1 of the first embodiment, in the liquid crystal display 3 of the present invention, the chromaticity detecting circuit 34 outputs an actual chromaticity value instead of the first memory 121, and does not need to detect the liquid crystal display during manufacturing or detection. The actual chromaticity value of 3 can improve the manufacturing process and save manufacturing time.

However, the liquid crystal display device of the present invention is not limited to the above embodiment. For example, in the first embodiment, when it is decided to correct only the red picture data and the blue picture data, and the green picture data is not corrected, the calculation unit You can also store the following formula:

Where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; r1, r2, r3, r4 respectively represent distances of four critical chromaticity coordinates to the actual chromaticity value; R1, R2 , R3, R4 respectively represent the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; B1, B2, B3, B4 respectively represent the blue of the preset modified gray scale of the four critical chromaticity coordinates Correct the grayscale.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be able to make equivalent modifications or variations in accordance with the spirit of the present invention. All should be covered by the following patent application.

1, 2, 3‧‧‧ liquid crystal display

11, 21‧‧‧ comparison selection circuit

111‧‧‧ Data Latch

112‧‧‧ comparator

113‧‧‧Selection circuit

12, 22, 32‧‧‧ Gray scale correction circuit

121‧‧‧First memory

122‧‧‧Second memory

225‧‧‧ third memory

326‧‧‧ fourth memory

123, 323‧‧‧ calculation unit

124, 324‧‧‧ Output unit

13, 23‧‧‧ data processor

10‧‧‧LCD panel

34‧‧‧Chroma detection circuit

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram showing the circuit of a first embodiment of a liquid crystal display of the present invention.

Figure 2 is a chromaticity area division diagram of a white light emitting diode defined by a chromaticity coordinate system.

3 is a flow chart showing a driving method of the liquid crystal display shown in FIG. 2.

Figure 4 is a block diagram showing the circuit of a second embodiment of the liquid crystal display of the present invention.

Figure 5 is a block diagram showing the circuit of a third embodiment of the liquid crystal display of the present invention.

1‧‧‧LCD display

11‧‧‧Comparative selection circuit

111‧‧‧ Data Latch

112‧‧‧ comparator

113‧‧‧Selection circuit

12‧‧‧ Grayscale correction circuit

121‧‧‧First memory

122‧‧‧Second memory

123‧‧‧Computation unit

124‧‧‧Output unit

13‧‧‧ Data Processor

10‧‧‧LCD panel

Claims (17)

A liquid crystal display comprising a data processor, a liquid crystal display panel, a comparison selection circuit and a gray scale correction circuit for outputting a corrected picture data to the comparison selection circuit, the comparison selection circuit Receiving picture data, and determining whether the picture data represents an all white picture, when the picture data represents a non-full white picture, the comparison selection circuit directly outputs the picture data to the data processor; when the picture data represents all white In the picture, the comparison selection circuit outputs the corrected picture data to the data processor, and the data processor generates a grayscale voltage according to the picture data outputted by the comparison selection circuit or the corrected picture data, and the gray level voltage is supplied to the LCD panel. The liquid crystal display according to claim 1, wherein the comparison selection circuit comprises a comparator and a selection circuit, and the comparator determines whether the picture material represents an all white picture, and when the picture data represents a non-full In the white screen, the comparator outputs a first control signal to the selection circuit; when the picture data represents an all white picture, the comparator outputs a second control signal to the selection circuit, when the selection circuit receives the When the first control signal is received, the selection circuit supplies the picture data to the data processor; when the selection circuit receives the second control signal, the selection circuit provides the correction picture data to the data processor. The liquid crystal display of claim 2, wherein the comparison selection circuit further comprises a data latch, the data latch temporarily storing the received picture data and sequentially outputting the picture data to the comparator . The liquid crystal display of claim 2, wherein the selection circuit is a multiplex selector. The liquid crystal display according to claim 2, wherein the corrected picture data is based on an actual chromaticity value of the liquid crystal display, the critical chromaticity coordinate of the chromaticity region and each critical color according to the actual chromaticity value. The preset correction gray scale corresponding to the coordinates is calculated. The liquid crystal display of claim 5, wherein the grayscale correction circuit comprises a first memory, a second memory, and a computing unit, wherein the first memory stores an actual color of the liquid crystal display. a value, the second memory stores four critical color coordinates corresponding to each chrominance region and a preset modified gray scale corresponding to each of the critical color coordinates, and the calculating unit is configured to use the chromaticity value according to the chromaticity value The four critical color coordinates located in the chromaticity region and the preset modified gray scale corresponding to each critical color coordinate calculate the corrected picture data of the all white picture, and the calculation unit includes a picture data correction formula. The liquid crystal display of claim 6, wherein the gray scale correction circuit further comprises an output unit, the output unit providing the corrected picture material to the data processor. The liquid crystal display according to claim 6, wherein the modified picture data includes red picture correction data, green picture correction data, and blue picture correction data, the red picture correction data, green picture correction data, and blue picture correction At least one of the materials in the data was corrected. The liquid crystal display of claim 8, wherein the red picture correction data, the green picture correction data, and the blue picture correction data satisfy the following chromaticity correction formula:



Where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; r1, r2, r3, r4 respectively represent distances of four critical chromaticity coordinates to the actual chromaticity value; R1, R2 , R3, R4 respectively represent the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; G1, G2, G3, G4 respectively represent the green correction in the preset modified gray scale of the four critical chromaticity coordinates Grayscale; B1, B2, B3, and B4 represent the blue corrected grayscales in the preset modified grayscales of the four critical chromaticity coordinates, respectively. The liquid crystal display of claim 8, wherein the red picture correction data, the green picture correction data, and the blue picture correction data satisfy the following chromaticity correction formula:



Where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; r1, r2, r3, r4 respectively represent distances of four critical chromaticity coordinates to the actual chromaticity value; R1, R2 , R3, R4 respectively represent the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; B1, B2, B3, B4 respectively represent the blue of the preset modified gray scale of the four critical chromaticity coordinates Correct the grayscale. The liquid crystal display according to claim 2, wherein the gray scale correction circuit comprises a third memory, and the third memory stores the corrected picture material. The liquid crystal display of claim 2, wherein the liquid crystal display comprises a chrominance detector for detecting an actual chromaticity value of the liquid crystal display, and outputting the chromaticity value to the ash a gray level correction circuit comprising a fourth memory, a calculation unit and an output unit, wherein the fourth memory stores four critical color seats corresponding to each chrominance region and each of the critical color coordinates Presetting a gray scale mark, wherein the calculating unit is configured to calculate the white color according to the chromaticity value, the four critical color coordinates of the chromaticity region in which the chromaticity value is located, and the preset modified gray scale corresponding to each critical color coordinate The corrected picture data of the picture, the output unit outputs the corrected picture data to the data processor. A driving method of a liquid crystal display, comprising the following steps:
Determining whether the screen material represents an all-white screen; and when the screen data represents a non-white screen, performing data processing on the screen data; and when the screen data represents an all-white screen, providing a modified screen data, the correction screen is provided Data processing,
The corrected picture data is calculated according to an actual chromaticity value of the liquid crystal display, a critical chromaticity coordinate of the chromaticity region in which the actual chromaticity value is located, and a preset gradation corresponding to each critical color coordinate. The method for driving a liquid crystal display according to claim 13 , wherein the processing the data on the screen data or the modified image data comprises: converting the screen data or the corrected image data into a gray scale voltage, and simultaneously generating Multiple display drive signals for screen display. The method for driving a liquid crystal display according to claim 13, wherein the modified picture data includes red picture correction data, green picture correction data, and blue picture correction data, the red picture correction data, green picture correction data, and At least one of the blue screen corrections has been corrected. The method for driving a liquid crystal display according to claim 15, wherein the red picture correction data, the green picture correction data, and the blue picture correction data satisfy the following chromaticity correction formula:



Where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; r1, r2, r3, r4 respectively represent distances of four critical chromaticity coordinates to the actual chromaticity value; R1, R2 , R3, R4 respectively represent the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; G1, G2, G3, G4 respectively represent the green correction in the preset modified gray scale of the four critical chromaticity coordinates Grayscale; B1, B2, B3, and B4 represent the blue corrected grayscales in the preset modified grayscales of the four critical chromaticity coordinates, respectively. The method for driving a liquid crystal display according to claim 15, wherein the red picture correction data, the green picture correction data, and the blue picture correction data satisfy the following chromaticity correction formula:



Where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; r1, r2, r3, r4 respectively represent distances of four critical chromaticity coordinates to the actual chromaticity value; R1, R2 , R3, R4 respectively represent the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; B1, B2, B3, B4 respectively represent the blue of the preset modified gray scale of the four critical chromaticity coordinates Correct the grayscale.