CN111292697A - Method for improving color cast of display device - Google Patents
Method for improving color cast of display device Download PDFInfo
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- CN111292697A CN111292697A CN202010231769.XA CN202010231769A CN111292697A CN 111292697 A CN111292697 A CN 111292697A CN 202010231769 A CN202010231769 A CN 202010231769A CN 111292697 A CN111292697 A CN 111292697A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
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Abstract
The application discloses a method for improving color cast of a display device, which comprises the following steps: measuring brightness and color coordinate data of all the sub-pixels in the first pixel under the front-view condition and the side-view condition; acquiring gray-scale values and color coordinate values corresponding to all the sub-pixels in the first pixel when the display device displays a picture, and adding the color coordinate values of all the sub-pixels in the first pixel to obtain the color coordinate value of the first pixel; converting the color coordinates of the first pixel into (L, u, v) color space; calculating the difference value delta u and delta v of the color space color coordinates of the first pixel in the front view state and the side view state; and calculating a chromaticity deviation value delta E of the first pixel in the front view state and the side view state according to delta u and delta v, and correcting the chromaticity of the first pixel in the side view state according to delta E. The display of the pixels is corrected based on the brightness and the chromaticity, so that the display effect of the pixels is better under the side-looking condition, and the problem of large-viewing-angle color cast of the display device is effectively solved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a method for improving color shift of a display device.
Background
The display frame of the liquid crystal panel is composed of a plurality of pixels arranged in an array, each pixel is generally composed of sub-pixels for respectively displaying various colors, and the brightness displayed by each sub-pixel is determined by the brightness of a backlight module of the liquid crystal display and the gray scale of the sub-pixels of the liquid crystal panel. In the conventional driving method of the liquid crystal panel, the most common method is to maintain a fixed brightness by using the brightness of the backlight module, and to drive the liquid crystal in each sub-pixel of the liquid crystal panel to rotate by using gray scale voltages with different magnitudes according to the input image data, so as to determine the light transmittance (i.e., brightness) of each sub-pixel through the rotation angle of the liquid crystal molecules, thereby achieving the purpose of gray scale display and display.
With the continuous application of liquid crystal panels, the requirement of people on the viewing angle of the liquid crystal panel is gradually increased, and therefore, a wide-viewing-angle liquid crystal display with a relatively large viewing angle is developed, and the wide-viewing-angle liquid crystal display generally has the problem of serious large viewing angle color cast.
Disclosure of Invention
The embodiment of the application provides a method for improving color cast of a display device, so as to solve the technical problem that the existing wide-viewing-angle liquid crystal display with a larger viewing angle has serious large viewing angle color cast.
In order to solve the above problems, the technical scheme provided by the invention is as follows:
a method for improving color shift of a display device, each pixel of the display device comprising a plurality of differently colored sub-pixels; the chrominance correction method comprises the following steps:
s10, measuring the brightness and color coordinate data of all the sub-pixels in the first pixel at the preset position under the front-view condition and the side-view condition;
s20, acquiring corresponding gray-scale values and color coordinate values of all the sub-pixels in the first pixel when the display device displays the picture, and adding the color coordinate values of all the sub-pixels in the first pixel to obtain the color coordinate value of the first pixel;
s30, transforming the color coordinates of the first pixel into a (L, u, v) color space according to the CIE 1976(L, u, v) standard colorimetry system, (L, u, v) representing the color space color coordinates of the first pixel in the color space;
s40, calculating the difference value delta u and delta v of the color space color coordinates of the first pixel in the front view state and the side view state;
and S50, calculating a chromaticity deviation value delta E of the first pixel in the front view state and the side view state according to delta u and delta v, and correcting the chromaticity of the first pixel in the side view state according to delta E.
In some embodiments, the step S50 includes:
s51, calculating a chromaticity deviation value delta E1 of the first pixel in a front view state and a side view state when all the sub-pixels in the first pixel have the same brightness;
s52, calculating a chromaticity deviation value delta E2 of the first pixel in a front view state and a side view state when the sub-pixels in the first pixel have different brightness;
and S53, correcting the chromaticity of the first pixel in the side-looking condition according to the difference value of the delta E1 and the delta E2.
In some embodiments, after the step S40 and before the step S50, the chrominance correction method further comprises:
and S60, repeating the steps S20 to S40, and calculating the difference value delta u and delta v of the color space color coordinates of the first pixel in the front view state and the side view state when the display device displays a plurality of different pictures.
In some embodiments, the step S60 includes:
s61, summing all chromaticity deviation values delta E of the first pixel when the display device displays a plurality of different pictures and calculating an average value;
and S62, correcting the chromaticity of the first pixel in the side-view condition according to the average value of the delta E.
In some embodiments, in step S60, the chromaticity deviation Δ E of the first pixel when the display device displays 9 seich images is measured and calculated according to the seich specification.
In some embodiments, after the step S20 and before the step S30, the chrominance correction method further comprises:
and S70, converting the color coordinate of the first pixel into an xyz coordinate system according to a CIE 1931-xyz standard colorimetry system.
In some embodiments, the chromaticity deviation value Δ E is related to Δ u and Δ v by a relationship of
In some embodiments, when the display device performs display, all pixels are corrected based on the correction method for the chromaticity of the first pixel.
In some embodiments, the first pixel comprises at least a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
In some embodiments, the first pixel is located in a central region of the pixel device.
The beneficial effects of the invention application are as follows: the display of the pixels is corrected based on the brightness and the chromaticity, so that the display effect of the pixels is better under the side-looking condition, and the problem of large-viewing-angle color cast of the display device is effectively solved.
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The technical solution and other advantages of the present application will become apparent from the detailed description of the embodiments of the present application with reference to the accompanying drawings.
FIG. 1 is a schematic diagram illustrating a process for improving color shift of a display device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram showing colors of a pixel when a red sub-pixel, a green sub-pixel and a blue sub-pixel display different gray scales according to the present invention;
FIG. 3 is a diagram illustrating the viewing angle improvement of the display device without large viewing angle compensation, with luminance-based large viewing angle compensation, and with chrominance and luminance-based large viewing angle compensation according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and are not to be construed as limiting the present application. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the application. In order to simplify the disclosure of the present application, specific example components and arrangements are described below. Of course, they are merely examples and are not intended to limit the present application. Moreover, the present application may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, examples of various specific processes and materials are provided herein, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The invention aims at the technical problem that the existing wide-viewing-angle liquid crystal display with a larger viewing angle has serious large viewing angle color cast.
A method for improving color shift of a display device, as shown in FIG. 1, each pixel of the display device comprises a plurality of sub-pixels with different colors; the chrominance correction method comprises the following steps:
s10, measuring the brightness and color coordinate data of all the sub-pixels in the first pixel at the preset position under the front-view condition and the side-view condition;
s20, acquiring corresponding gray-scale values and color coordinate values of all the sub-pixels in the first pixel when the display device displays the picture, and adding the color coordinate values of all the sub-pixels in the first pixel to obtain the color coordinate value of the first pixel;
s30, transforming the color coordinates of the first pixel into a (L, u, v) color space according to the CIE 1976(L, u, v) standard colorimetry system, (L, u, v) representing the color space color coordinates of the first pixel in the color space;
s40, calculating the difference value delta u and delta v of the color space color coordinates of the first pixel in the front view state and the side view state;
and S50, calculating a chromaticity deviation value delta E of the first pixel in the front view state and the side view state according to delta u and delta v, and correcting the chromaticity of the first pixel in the side view state according to delta E.
It should be noted that, the display of the pixels is corrected based on the brightness and the chromaticity, so that the display effect of the pixels is better in the side view situation, and the problem of large viewing angle color cast of the display device is effectively solved.
Specifically, after the step S20 and before the step S30, the method for correcting chromaticity further includes:
and S70, converting the color coordinate of the first pixel into an xyz coordinate system according to a CIE 1931-xyz standard colorimetry system.
It should be noted that, as known to those skilled in the art, CIE 1976(L, u, v) standard colorimetry system (also called CIELUV color space) where L denotes the brightness of an object and u and v are the chromaticities. Proposed by the commission internationale de l' eclairage CIE in 1976, with visual uniformity. For a typical image, u and v range from-100 to +100, with a luminance of 0 to 100.
It should be noted that, after the color coordinates of the first pixel are converted into the xyz coordinate system, the coordinates of the first pixel in the xyz coordinate system are converted into the (L, u, v) color space.
The first pixel includes at least one red sub-pixel (hereinafter, referred to as "R sub-pixel"), one green sub-pixel (hereinafter, referred to as "G sub-pixel"), and one blue sub-pixel (hereinafter, referred to as "B sub-pixel").
Specifically, the step S50 includes:
s51, calculating a chromaticity deviation value delta E1 of the first pixel in a front view state and a side view state when all the sub-pixels in the first pixel have the same brightness;
s52, calculating a chromaticity deviation value delta E2 of the first pixel in a front view state and a side view state when the sub-pixels in the first pixel have different brightness;
and S53, correcting the chromaticity of the first pixel in the side-looking condition according to the difference value of the delta E1 and the delta E2.
As shown in fig. 2, fig. 2 schematically illustrates colors displayed by the pixels when the R, G and B sub-pixels in a pixel are filled with different gray-scale fill values, and it is known to those skilled in the art that the luminance of the sub-pixels depends on the gray-scale values thereof, and the luminance of the sub-pixels is varied, so that chromaticity deviation values Δ E1 and Δ E2 in the front view state and the side view state can be measured when the pixels display different colors, and the chromaticity of the first pixel in the side view state can be more accurately corrected by comparing the difference values of Δ E1 and Δ E2.
Specifically, after the step S40 and before the step S50, the method for correcting chromaticity includes:
and S60, repeating the steps S20 to S40, and calculating the difference value delta u and delta v of the color space color coordinates of the first pixel in the front view state and the side view state when the display device displays a plurality of different pictures.
Further, the step S60 includes:
s61, summing all chromaticity deviation values delta E of the first pixel when the display device displays a plurality of different pictures and calculating an average value;
and S62, correcting the chromaticity of the first pixel in the side-view condition according to the average value of the delta E.
It should be noted that, by summing the chromaticity deviation values Δ E of the first pixel when the pixel device displays a plurality of pictures and calculating an average value, and correcting the chromaticity of the first pixel in the side view according to the average value, the correction result is more accurate.
Further, in step S60, the chromaticity deviation Δ E of the first pixel when the display device displays 9 seirqi pictures is measured and calculated according to the seixi standard.
It should be noted that, the 9 selectedfromaji pictures are based on the principle that the deviation of the luminance value of the first pixel is small when all the sub-pixels in the first pixel have the same luminance and when all the sub-pixel parts in the first pixel have different luminances under the front view and the side view, and the deviation of the chrominance value of the first pixel is small when all the sub-pixels in the first pixel have the same luminance and when all the sub-pixel parts in the first pixel have different luminances under the front view and the side view, and when the display device displays other pictures besides the 9 selectedfromaji pictures, the correction of the pixels is based on the correction method when the sierrai pictures are displayed.
Specifically, after the step S20 and before the step S30, the method for correcting chromaticity further includes:
and S70, converting the color coordinate of the first pixel into an xyz coordinate system according to a CIE 1931-xyz standard colorimetry system.
It should be noted that, as known to those skilled in the art, in the xyz standard colorimetry system, Y is the lightness or brightness of a color. x and y are chromaticity coordinates that are two of the three values normalized by a function of all three tristimulus values X, Y and Z, where:
specifically, the chromaticity deviation value Δ E is related to Δ u and Δ v by the relationship
Specifically, when the display device performs display, all pixels are corrected based on the correction method for the chromaticity of the first pixel.
Specifically, the first pixel is located in a central region of the pixel device.
Referring to fig. 3, fig. 3 shows the viewing angle improvement of the display device when there is no compensation for large viewing angle, the compensation for large viewing angle is based on luminance, and the compensation for large viewing angle is based on chrominance and luminance, and it can be seen from fig. 3 that the compensation for large viewing angle based on chrominance and luminance has a significant improvement effect on color cast.
The invention has the beneficial effects that: the display of the pixels is corrected based on the brightness and the chromaticity, so that the display effect of the pixels is better under the side-looking condition, and the problem of large-viewing-angle color cast of the display device is effectively solved.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The principle and the implementation of the present application are explained by applying specific examples, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (10)
1. A method for improving color shift of a display device, wherein each pixel of the display device comprises a plurality of sub-pixels with different colors; the chrominance correction method comprises the following steps:
s10, measuring the brightness and color coordinate data of all the sub-pixels in the first pixel at the preset position under the front-view condition and the side-view condition;
s20, acquiring corresponding gray-scale values and color coordinate values of all the sub-pixels in the first pixel when the display device displays the picture, and adding the color coordinate values of all the sub-pixels in the first pixel to obtain the color coordinate value of the first pixel;
s30, transforming the color coordinates of the first pixel into a (L, u, v) color space according to the CIE 1976(L, u, v) standard colorimetry system, (L, u, v) representing the color space color coordinates of the first pixel in the color space;
s40, calculating the difference value delta u and delta v of the color space color coordinates of the first pixel in the front view state and the side view state;
and S50, calculating a chromaticity deviation value delta E of the first pixel in the front view state and the side view state according to delta u and delta v, and correcting the chromaticity of the first pixel in the side view state according to delta E.
2. The method for improving color shift of a display device according to claim 1, wherein the step S50 comprises:
s51, calculating a chromaticity deviation value delta E1 of the first pixel in a front view state and a side view state when all the sub-pixels in the first pixel have the same brightness;
s52, calculating a chromaticity deviation value delta E2 of the first pixel in a front view state and a side view state when the sub-pixels in the first pixel have different brightness;
and S53, correcting the chromaticity of the first pixel in the side-looking condition according to the difference value of the delta E1 and the delta E2.
3. The method for improving color shift of a display device according to claim 1, wherein after the step S40 and before the step S50, the method for correcting chromaticity further comprises:
and S60, repeating the steps S20 to S40, and calculating the difference value delta u and delta v of the color space color coordinates of the first pixel in the front view state and the side view state when the display device displays a plurality of different pictures.
4. The method for improving color shift of a display device according to claim 3, wherein the step S60 comprises:
s61, summing all chromaticity deviation values delta E of the first pixel when the display device displays a plurality of different pictures and calculating an average value;
and S62, correcting the chromaticity of the first pixel in the side-view condition according to the average value of the delta E.
5. The method as claimed in claim 4, wherein in step S60, the chromaticity deviation Δ E of the first pixel when the display device displays 9 Sessie images is measured and calculated according to Sessie standard.
6. The method for improving color shift of a display device according to claim 1, wherein after the step S20 and before the step S30, the method for correcting chromaticity further comprises:
and S70, converting the color coordinate of the first pixel into an xyz coordinate system according to a CIE 1931-xyz standard colorimetry system.
7. The method according to claim 1, wherein the chromaticity deviation Δ E is related to Δ u and Δ v by
8. The method according to claim 1, wherein the display device corrects all pixels based on the chromaticity of the first pixel when displaying.
9. The method as claimed in claim 1, wherein the first pixel comprises at least a red sub-pixel, a green sub-pixel and a blue sub-pixel.
10. The method of claim 1, wherein the first pixel is located in a central region of the pixel device.
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