TW201118840A - Liquid crystal display and driving method thereof - Google Patents

Abstract

A liquid crystal display includes a comparing circuit, a gray adjusting circuit, a data processor, and a liquid crystal panel. The comparing circuit receives image data and judges whether the image data are full white image data. When the image data are full white image data, the comparing circuit provides the image data to the data processor. When the image data are not full white image data, the gray adjusting circuit provides adjusting image data to the comparing circuit, and the comparing circuit provides the adjusting image data to the data processor. The data processor provides a plurality of gray voltage to the liquid crystal panel according to the image data or the adjusting image data.

Description

201118840 VI. Description of the Invention: [Technical Field of the Invention] [0001] The present invention relates to a liquid crystal display and a driving method thereof. [Prior Art] [0002] The liquid crystal in the liquid crystal display itself does not have a light-emitting property, and therefore, in order to achieve a display effect, it is necessary to provide a light source device such as a backlight module to the liquid crystal display panel to realize a display function. [0003] In recent years, the optoelectronic industry has developed, and the Light Emitting Diode (LED) has been widely used as a backlight for liquid crystal displays due to its advantages of small accumulation, low energy consumption, high brightness, long life, and stable illumination. The light source in the module. Among them, the application of white light-emitting diodes is more common. [0004] The commonly used white light-emitting diodes generally include a precursor wafer and a sealant having a phosphor powder, and the light emitted from the light-emitting chip excites the work powder to generate white light. White light-emitting diodes are usually mass-produced and produced. It is stupid that 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 The light is blue, and some of them are yellowish. The industry defines the chromaticity usually by the chromaticity coordinate system, and according to the chromaticity of the white light emitting diode, the chromaticity coordinate is scribed as the white light emitting diode chromaticity of the same chromaticity region of the same chromaticity region. Similar, the white light emitting diodes of different chromaticity regions have large differences in chromaticity. [0005] 098140765 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 expression is different when a plurality of white light emitting diodes in a second chromaticity region are used as a light source. And the form number A0101 Page 4 of 29% ' 0982069991-0 201118840 , [0006] In the chromaticity area, only one or two chromaticity areas of the white light emitting diode with the LCD panel will be compared Good color performance, when the white light emitting diodes of other chromaticity areas are matched with the liquid crystal display panel, the phenomenon of color cast of the all white enamel surface may occur, for example, the whole white picture is bluish or yellowish, which greatly affects the liquid crystal display. The display effect. SUMMARY OF THE INVENTION In view of the above, it is necessary to provide a liquid crystal display that effectively improves the color cast phenomenon of an all-white picture. 〇 _7] At the same time, it is also necessary to provide a driving method for a liquid crystal display that effectively improves the color cast phenomenon of the entire white screen. [0008] 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 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 an all white picture, the gray level correction circuit outputs a corrected picture material Up to the comparison selection circuit, 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 rotated by the comparison selection circuit or the corrected picture data, the gray level voltage is provided To the liquid crystal display panel. [0009] A method for driving a liquid crystal display, comprising the steps of: determining whether a picture material represents an all-white picture; [0011] when the picture material represents a non-full white picture, performing data processing on the picture data; When the picture data represents an all-white picture, a correction picture 098140765 form number A0101 page 5 / 29 pages 0982069991-0 201118840 face data is provided, and the correction picture data is processed. The correction 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. [0012] 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 face data to the data processor, and the data processor is modified according to the The surface data outputs a gray scale voltage to realize 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. [0013] In comparison with the prior art, in the driving method of the liquid crystal display of the present invention, when the picture material represents an all-white picture, the corrected picture data is supplied to be 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. [Embodiment] [0014] 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 the RGB data representing the gray level of the display screen, and determine whether the picture data represents a full white surface. When the surface data represents a non-full white picture, the picture is selected. The data is output to the material processor 13. The grayscale correction circuit 12 outputs a corrected screen data when the screen data generation 098140765 Form No. A0101 Page 6/29 pages 0982069991-0 201118840 Table 1 is a full white screen, and the corrected screen data is output to the data processing. 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 plurality of display driving signals to the liquid crystal display panel 1 〇, so that the liquid crystal The display panel is not displayed. [0015] The comparison selection circuit 11 includes a data latch lu, a comparator 112, and a selection circuit 113. The material latch 111 temporarily stores the received picture material and sequentially outputs the picture data to the comparator 112. The comparator 112 determines whether the picture resource 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 an all white When the picture is displayed, it outputs a second control signal to the selection circuit 丨13. When the selection circuit 113 receives the first control signal, it supplies the face data to the data processor 13. The selection circuit 113 can be a multiplex selector. [0016] The grayscale correction circuit 12 includes a first memory 121, a second memory 122, a calculation single collapse 23, and a 'output cell 124. Please also refer to Figure 2 and Figure 2 for the chromaticity area division diagram of the white light emitting diode under the definition of the chromaticity coordinate system. Under the coordinate system, a total of eleven chromaticity areas FI are shown. , G1, H, I, J1 and M, N, 0, P, Q, R» each chrominance region is substantially a parallelogram and includes four critical chromaticity coordinates 'such as four criticalities of the chromaticity region J1 Color coordinates Aj (xaj, Yaj), Bj (Xbj, Ybj), Cj (Xcj, Ycj), Dj (Xdj, Ydj). [0017] The first memory 121 stores a chrominance value, which is displayed on the liquid crystal display 1 by a color metric measuring instrument and represents the full white painting 098140765 Form No. A0101 Page 7 / Total 29 pages 0982069991-0 201118840 When the picture data of the face is not corrected, the chromaticity coordinates of the all white picture (Χ0, Υ0) are measured, and the chromaticity coordinates 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. [0018] The second memory 122 stores four critical color coordinates corresponding to each chroma region and a preset modified gray scale corresponding to each critical color coordinate. 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. [0019] Each of the preset correction gray levels 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 A j 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 For the 2 5 5 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 ,, and is applied to the red gray scale of the display panel, blue gray 098140765 Form No. 101 0101 No. 8 Page / Total 29 pages 0982069991-0 201118840 Both the order and the green gray scale are 255 gray scales, and there is no color cast phenomenon in the white screen of the display. Then, when the display shows the all-white surface, applying the red corrected gray level, the blue corrected gray level and the green corrected gray level corresponding to the A j point will just cause the display to have no color cast phenomenon, that is, the red correction is applied. After the gray scale, the blue corrected gray scale, and the green corrected gray scale, the measured chromaticity value measured again is located in the chromaticity region ,, and preferably located in the color chromaticity region Η and the chromaticity region J1. The point Ah 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 calculated by experiment or calculation using the above principle, and the red correction gray corresponding to each boundary color coordinate The order 'blue correction gray scale and green correction gray scale can be, not allowed one: for example: the red color scale corresponding to the critical color coordinate A j point and the green corrected gray scale may be 220, 255, 222 'also # can be 221,254,220. [0020] The calculating unit 123 is configured to calculate an all-white image according to the chromaticity value, the four critical color coordinates of the chromaticity region in which the chromaticity value is located, and the preset 〇-corrected grayscale corresponding to each of the critical color coordinates. Article, painting: surface information, including the screen

Data correction formula. Since the screen data includes red image data (R

Data), green data (g Data) and blue data (B Data), so the calculation unit 123 can include three picture data correction formulas corresponding to the red, green and blue picture materials, of course, when the red, green, When a certain picture material in the 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 formulas are as follows: 098140765 Form No. A0101 Page 9 of 29 0982069991-0 201118840 [0021]

R rl r2 r3 r4 [0022]

G

[0023]

B 1 1 II 1 1 | rl 1 1 rl r3 1 r4 — umbrella + 1 *02 + 1 *G3+ 1 *04 rl rl r3 r4 1 1 1 1 — + a + + rl n fi r4 —*HI+ 1 *52 + 1 *53+ 1 *54 rl rl r3 r4 11 + 1 1 rl rl r3 r4 [0024] where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; r 1,r 2, r 3, r 4 respectively represent the distance from the four critical chromaticity coordinates to the actual chromaticity value (X0, Y0) (can be obtained by the formula of the distance between two points in the coordinate system); Rl, r = ^(xl -x2)2 + (yl-y2)2 R2, R3, R4 is another 丨] represents the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; Gl, G2, G3, G4 respectively represent four The green corrected gray scale in the preset corrected gray scale of the critical chromaticity coordinates; Bl, B2, B3, B4 respectively represent the preset modified gray scale of the four critical chromaticity coordinates 098140765 Form No. A0101 Page 10 / Total 29 pages 0982069991-0 201118840 [0025] [0028] 098 [0029] 098140765 Blue correction gray scale. The output unit 124 outputs the corrected face data to the selection circuit 113. When the selection circuit 113 receives the second control signal, it supplies the correction picture data to the material processor 13. Please refer to FIG. 3' for a flowchart of the driving method of the liquid crystal display 1. The working principle of the liquid crystal display 1 is as follows: (1) determining whether the picture data represents a full white surface, 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 material can be a low voltage differential signal. The comparator 112 determines whether the received picture data is a full white data. The red and green 'blue picture data in the picture data meet the following conditions at the same time: red picture data r=255 gray level, green picture data R=255 grayscale, blue screen data [{=255 grayscale, the V* w... ; ' 4. ! The screen data represents a full white surface data; when the picture is red, green, blue When at least one of the picture data is not equal to 255 gray level, the picture data represents a non-full white surface data. (1) When the screen data represents a non-full white screen, the screen data is processed; when the screen data represents an all white screen, a corrected face data is provided, and the corrected screen data is processed. The modified picture data is calculated according to the actual chromaticity value of the liquid crystal display, the critical chromaticity coordinate of the chromaticity region in which the actual chromaticity value is located, and the preset modified gray scale corresponding to each critical color coordinate, The steps are as follows: When the picture data is a non-full white picture material, the comparator 112 outputs a form number A0101 page 11 / 29 pages 0982069991-0 [0030] 201118840 a first control signal to the selection circuit 113. When the picture data is an all-white picture material, the comparator 112 outputs a second control signal to the selection circuit 113. [0031] The first memory 121 supplies the chrominance 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 value in the chromaticity region 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 figure correction data and the blue picture are obtained in the calculation unit 123. After the data is corrected, the calculation unit 123 will directly output 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 scale. The output unit 124 outputs the corrected picture data received thereto to the selection circuit 113. [0032] When the selection circuit 113 receives the first control signal, that is, the comparator 112 determines that the picture data represents a non-full white picture, the selection circuit 113 directly provides the picture data provided by the data latch 111 to The data processor 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 outputs the correction picture 098140765 form of the output unit 124 of the gray-scale correction circuit. No. A0101 Page 12 of 29 0982069991-0 201118840 [0034] [0035] The data is supplied to the data processor 13. The data processing of the screen data or the modified face data includes: converting the screen data or the corrected picture data into a gray scale voltage, and generating other display driving signals to realize the face display. The specific steps are as follows: The data processor 13 generates a gray scale voltage and a complex display driving signal (such as a scanning voltage signal, a common voltage signal, a clock control signal, etc.) according to the received picture data or the corrected picture data, the gray level voltage And the plurality of display driving signals are output to the liquid crystal display panel 10, so that the liquid crystal display panel 10 displays a picture. Compared with the prior art, the liquid crystal display 1 of the present invention determines whether the picture material represents an all white plane through the comparison selection circuit 11, and when the picture material represents an all white picture, the gray level correction circuit 12 is based on the actuality of the liquid crystal display 1. The chromaticity value, the chromaticity region in which the actual chromaticity value is located: 1 boundary chromaticity coordinate and a preset correction gray scale corresponding to each critical color coordinate to calculate the corrected picture data, the data processor 13 is based on The correction picture data outputs gray scale voltage and other display driving signals to realize 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 specified 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. Referring to Figure 4, there is shown a circuit block diagram of a second embodiment of the liquid crystal display of the present invention. The liquid crystal display 2 of this embodiment differs from the liquid crystal display 1 of the first embodiment mainly in that the gray scale correction circuit 22 includes a third note 098140765. Form number Α 0101 page 13 / 29 pages 0982069991-0 [0036] 201118840 The body 225 stores the corrected picture data, and the modified picture data includes red face correction data, green face correction data, and blue face 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 face data in the third memory 225 is supplied to the material processor 23. [0037] 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 and the first implementation

The second memory 122 in the mode is the same, and the calculation unit 323 and the output unit U 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 outputs the chromaticity value to the grayscale correcting circuit 32. [0039] 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 the actual chromaticity value instead of the first memory 121, and does not need to be detected during manufacturing or detection. The actual chromaticity value of the liquid crystal display 3 can be improved by reducing the manufacturing process and saving manufacturing time 098140765 Form No. A0101 Page 14 / 29 pages 0982069991-0 201118840. [0040] However, the liquid crystal display device of the present invention is not limited to the above embodiments. For example, in the first embodiment, when it is determined that only the red kneading data and the blue image data are corrected, the green kneading data is not performed. When correcting, the calculation unit can also store the following formula: [0041]

R Ο

Rl_r2_r3_r4 Ϊ~~Ϊ~~T~~I rl rl r3 r4 [0042] G = 255 [0043]

B _*Μ+ —*52 + —*53+ —*54 rl rl r3 r4 1 + 〇

Rl rl r3 rA

[0044] wherein R represents red corrected picture data, G represents green corrected picture data, B represents red corrected picture data; rl, r2, r3, r4 respectively represent distances of four critical chromaticity coordinates to the actual chromaticity value; Rl, R2, R3, and R4 represent the red corrected gray scales in the preset modified gray scales of the four critical chromaticity coordinates, respectively; Bl, B2, B3, and B4 represent the preset corrected gray scales of the four critical chromaticity coordinates, respectively. The blue color is corrected. [0045] In summary, the present invention has indeed met the requirements of the invention patent, 爰 098 098140765 Form No. A0101 Page 15 / 29 page 0982069991-0 201118840 Patent application. 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. BRIEF DESCRIPTION OF THE DRAWINGS [0046] FIG. 1 is a circuit block diagram of a first embodiment of a liquid crystal display of the present invention. 2 is a chromaticity region division diagram of a white light emitting diode defined by a chromaticity coordinate system. 3 is a flow chart of a driving method of the liquid crystal display shown in FIG. 2. 4 is a circuit block diagram of a second embodiment of the liquid crystal display of the present invention. 5 is a circuit block diagram of a third embodiment of the liquid crystal display of the present invention. [Description of Main Component Symbols] [0051] Liquid Crystal Display Iss 1, 2, 3 [0052] Comparison Selection Circuit 11 '21 [0053] Data Latch 111 [0054] Comparator 112 [0055] Selection Circuit 113 [0056] Grayscale Correction Circuit 12, 22, 32 [0057] First Memory 121 [0058] Third Memory 122 [0059] Third Memory 225 Form No. A0101 Page 16 of 29 098140765 0982069991-0 201118840 [0060 Fourth memory 3 2 6 [0061] Computing unit 123, 323 [0062] Data processing unit 13, 23 [0063] Liquid crystal display panel 1 [0065] Chroma detection circuit 34 〇

098140765

Form No. A0101 Page 17 of 29 0982069991-0

Claims (1)

201118840 VII. Patent application scope: 1. A liquid crystal display, comprising: a data processor, a liquid crystal display panel, a comparison selection circuit and a gray scale correction circuit, wherein the gray scale correction circuit is configured to output a correction picture data to the Comparing the selection circuit, the comparison selection circuit is configured to receive the surface data, and determine whether the picture data represents a full white surface, and when the surface data represents a non-full white surface, the comparison selection circuit directly outputs the surface data to the The data processor; when the picture data represents a full white surface, the comparison selection circuit outputs the modified surface data to the data processor, and the data processor outputs the picture data or the corrected picture data according to the comparison selection circuit A gray scale voltage is generated, which is supplied to the liquid crystal display panel. 2. The liquid crystal display according to claim 1, wherein the comparison selection circuit comprises a comparator and a selection circuit, the comparator determining whether the picture material represents an all white picture, and when the picture data represents a The non-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 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. 3. 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 Comparators. 4. The liquid crystal display of claim 2, wherein the selection circuit is a multiplex selector. 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 。 The chroma values are calculated by the critical chromaticity coordinates of the chrominance region and the preset gradation coordinates corresponding to each of the critical color coordinates. 6. 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 the actual a chromaticity 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 color gradation value according to the color gradation value The four critical color coordinates of the chromaticity region in which the degree is located and the preset corrected grayscale corresponding to each critical color coordinate calculate the corrected picture data of the all white picture, and the calculation unit includes the picture data correction formula. 7. 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. 8. The liquid crystal display according to claim 6, wherein the correction picture material includes red face correction data, green picture correction data, and blue picture Q correction data, the red picture correction data, green picture correction data At least one of the data in the blue and blue corrections has been corrected. 9. The liquid crystal display according to 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: 098140765 Form No. A0101 Page 19 of 29 0982069991-0 201118840 丄丄*i?2 +丄*i?3+丄R = rl_rl_r3_r4 I~~Ϊ~~Γ~~Ϊ——H---1---1-- rl rl r3 rA G = Jl *〇L + J_*G2 + —*G3+ —*04 rl rl r3 rA ~" +- rl rl —*52 + —*53+ —*54 _r2_r3_r4 — I~~ϊI~I —H---1---1-- rl rl r3 rA where R is the red correction picture data and G is the green correction picture data. , B represents the red corrected surface data; rl, r2, r3, r4 represent the distance from the four critical chromaticity coordinates to the actual chromaticity values respectively; Rl, R2, R3, R 4 represent the four critical chromaticity coordinates respectively The red correction gray scale in the preset gray scale is preset; Gl, G2, G3, and G4 respectively represent the green corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; Bl, B2, B3, and B4 respectively represent four The blue color correction gray scale in the preset correction gray scale of the critical chromaticity coordinates 098140765. The number of the liquid crystal display according to the eighth aspect of the patent application, wherein The red picture correction data, the green surface correction data, and the blue picture correction data conform to the following chromaticity correction formula: rl r2 r3 r4 —+ — + — + — rl rl r3 rA ❹ 〇11 . G = 2551111 + —*53+ —*B4 rl rl_r3 r4_ Ϊ~~Ϊ~11 ~---1--4---rl rl r3 r4 Where R represents red correction picture data, G represents green correction picture data, B represents red correction picture data; rl, r2, r3, r4 respectively represent distances of four critical chromaticity coordinates to the actual chromaticity value; Rl, R2 , R3, R4 respectively represent the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates; Bl, 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 of claim 2, wherein the gray scale correction circuit comprises a third memory, the third memory storing the corrected picture material. The liquid crystal display of claim 2, wherein the liquid crystal display comprises a chrominance detector for detecting the liquid crystal, wherein the liquid crystal display comprises a chromaticity detector, wherein the chromaticity detector is used for detecting the liquid crystal. An actual chromaticity value of the display, and outputting the chromaticity value to the grayscale correction circuit, the grayscale correction circuit includes a fourth memory, a calculation unit, and an output unit, the fourth memory stores each color a fourth critical color sitting corresponding to the degree region and a preset modified gray scale corresponding to each critical color coordinate, wherein the calculating unit is configured to use, according to the chromaticity value, four critical colors of the chromaticity region in which the chromaticity value is located The coordinate and the preset correction gray scale corresponding to each of the critical color coordinates calculate the corrected picture data of the all white plane, and the output unit outputs the corrected picture data to the data processor. 13 . A method for driving a liquid crystal display, comprising the steps of: determining whether a picture material represents a full white picture; and when the picture data represents a non-full white picture, performing data processing on the picture data; when the picture data represents Providing a modified face data for performing data processing on the corrected picture data, wherein the corrected picture data is based on an actual chromaticity value of the liquid crystal display and a chromaticity area in which the actual chromaticity value is located The critical chromaticity coordinates and the preset corrected gray scale corresponding to each critical color coordinate are calculated. The method for driving a liquid crystal display according to claim 13 , wherein the processing the data of the screen data or the corrected image data comprises: converting the screen data or the corrected image data into a gray scale voltage, At the same time, multiple display driving signals are generated to realize the screen display. The method of 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 At least one of the data and the blue screen correction data is corrected. 。 。 。 。 。 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098 098. The data conforms to the following chromaticity correction formula: soil * 迅 + 丄 * along + 丄丄〇 = _rl_r3_r4 — ϊ~~ϊ~~ϊ~ϊ —+ — + — + — rl rl r3 r4 G = Elm G2 +丄*G3+ rl r3 Rl rl r4 JL*ai+ —*32 + —*53+ —*54 rl_r2__rJ_r4 I~1 1 1 _-+ 1---h rl rl r 3 r A where R is the red correction picture data and G is the green correction picture data. B represents the red correction picture data; rl, r2, r3, r4 respectively represent the distance from the four critical chromaticity coordinates to the actual chromaticity value; Rl, R2, R3, R4 respectively represent the preset correction of the four critical chromaticity coordinates The red correction gray scale in the gray scale; Gl, G2, G3, G4 respectively represent the four critical chromaticity coordinates of 098140765 Form No. A0101 Page 23 / Total 29 Page 0982069991-0 201118840 Preset Correction Gray Correction Gray in Grayscale The steps B1, B2, B3, and B4 respectively represent the blue color correction gray scale in the preset correction gray scale of the four critical chromaticity coordinates. The driving method of the liquid crystal display according to the fifteenth aspect of the patent application, Among them, the red picture correction data, the green picture correction data and the blue picture correction data comply with the following chromaticity correction formula·· 丄*/?2 +丄丄〇rl factory 2 r3 r4 R =-1 11 1—-- _h---1---i-- rl rl r3 r4 G = 255 —*B2 + —*53+ —*54 rl rl Factory 3 r4 Rl rl r3 r4 where R represents the red correction picture data, G represents the green correction picture data, B represents the red correction picture data; rl, r2, r3, r4 represent the distance of the four critical chromaticity coordinates to the actual chromaticity value, respectively ; Rl, R2, R3, R4 represent the red corrected gray scale in the preset modified gray scale of the four critical chromaticity coordinates respectively; Bl, B2, B3, B4 represent the preset modified gray scale of the four critical chromaticity coordinates respectively; Medium blue corrects grayscale. 098140765 Form No. A0101 Page 24 of 29 0982069991-0