CN112289250B - Compensation method and device of display module - Google Patents
Compensation method and device of display module Download PDFInfo
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- CN112289250B CN112289250B CN202011183877.0A CN202011183877A CN112289250B CN 112289250 B CN112289250 B CN 112289250B CN 202011183877 A CN202011183877 A CN 202011183877A CN 112289250 B CN112289250 B CN 112289250B
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- 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
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Abstract
The embodiment of the invention discloses a compensation method and a compensation device of a display panel, which are used for determining target color coordinates and target brightness of a plurality of test pictures according to a color system of a display module and white standard color coordinates; acquiring a test color coordinate and a test brightness of the display module under each test picture; determining a color calibration structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture; and compensating the display module according to the color calibration structure. According to the technical scheme, when the color calibration structure is determined, the color coordinate factor is considered, the brightness factor is also considered, the calculation accuracy of the color calibration structure is increased, accurate compensation data can be obtained when the display module is compensated according to the color calibration structure, and the display picture quality of the display module can be improved.
Description
Technical Field
The embodiment of the invention relates to the technical field of display, in particular to a compensation method and device of a display module.
Background
With the development of display technology, the display quality of the display screen is required to be higher and higher.
The color accuracy of the display module affects the display quality of the display image. Among the prior art, when carrying out the color standard test and the calculation of display module assembly, there is the inaccurate problem of color standard calculation of display module assembly, causes according to the color standard of display module assembly to compensate the back to the display module assembly, and it is still relatively poor to show picture quality.
Disclosure of Invention
The invention provides a compensation method and a compensation device of a display module, which are used for accurately calculating a color quasi structure of a module panel and compensating the display module according to the color quasi structure so as to improve the picture display quality.
In a first aspect, an embodiment of the present invention provides a compensation method for a display module, including:
determining target color coordinates and target brightness of a plurality of test pictures according to a color system of the display module and the white standard color coordinates;
acquiring a test color coordinate and test brightness of the display module under each test picture;
determining a color calibration structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture;
and compensating the display module according to the color calibration structure.
Optionally, determining the target color coordinates and the target brightness of the multiple test pictures according to the color system of the display module and the white standard color coordinates includes:
determining a red standard color coordinate, a green standard color coordinate and a blue standard color coordinate according to a color system of the display module;
determining a target color coordinate of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate;
and determining the target brightness of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the target color coordinate of the test picture.
Optionally, determining a target color coordinate of the test frame according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate, and the white standard color coordinate includes:
in a CIE chromaticity diagram coordinate system, a equal division is respectively carried out on a connecting line of a white standard color coordinate and a red standard color coordinate, a connecting line of the white standard color coordinate and a green standard color coordinate, and a connecting line of the white standard color coordinate and a blue standard color coordinate to obtain a plurality of first equal division points, wherein a is more than or equal to 3;
in a CIE chromaticity diagram coordinate system, equally dividing a connecting line b of a red standard color coordinate and a green standard color coordinate, equally dividing a connecting line c of the red standard color coordinate and a blue standard color coordinate, and equally dividing a connecting line d of the green standard color coordinate and the blue standard color coordinate to obtain a plurality of second equally divided points, wherein b is more than or equal to 3, c is more than or equal to 3, and d is more than or equal to 3;
in a CIE chromaticity diagram coordinate system, equally dividing a connecting line a of a white standard color coordinate and a second equally dividing point to obtain a plurality of third equally dividing points;
and respectively determining the color coordinates corresponding to each first equant point, each second equant point and each third equant point, and the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate as target color coordinates of the plurality of test pictures.
Optionally, b is more than or equal to d, and c is more than or equal to d;
preferably, a is 4, b is 4, and d is 3.
Optionally, determining the target brightness of the test frame according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate, and the target color coordinate of the test frame includes:
determining the brightness ratio under the standard white picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate;
determining the brightness ratio under the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the target color coordinate of the test picture;
determining a red gray scale, a green gray scale and a blue gray scale under the test picture according to the brightness ratio under the test picture and the brightness ratio under the standard white picture;
and determining the target brightness of the test picture according to the red gray scale, the green gray scale and the blue gray scale.
Optionally, before determining the target color coordinates and the target brightness of the plurality of test pictures according to the color system of the display module and the white standard color coordinates, the method further includes:
and acquiring white standard color coordinates and white standard brightness of the display module under a standard white picture, wherein the standard white picture is a white picture under the maximum gray scale of sub-pixels of the display module.
Optionally, determining the color calibration structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test frame includes:
converting a target color coordinate and a first three-dimensional target coordinate consisting of target brightness corresponding to each test picture into a Lab color model according to a preset corresponding relation to obtain a second three-dimensional target coordinate corresponding to the three-dimensional target coordinate corresponding to each test picture in the Lab color model, wherein the second three-dimensional target coordinate comprises a target conversion color coordinate and target conversion brightness;
converting a first three-dimensional test coordinate consisting of the test color coordinate and the test brightness of each test picture into a Lab color model according to a preset corresponding relation to obtain a second three-dimensional test coordinate corresponding to each test picture, wherein the second three-dimensional test coordinate comprises a test conversion color coordinate and a test conversion brightness;
for each test picture, calculating a color standard value according to the target conversion color coordinate, the target conversion brightness, the test conversion color coordinate and the test conversion brightness;
and determining the color level value corresponding to each test picture as a color level structure.
Optionally, compensate the display module assembly according to the look structure, include:
determining a color space range to be compensated according to the color space structure;
and compensating the data voltage of the sub-pixel of at least one color in the display module according to the difference between the first three-dimensional target coordinate and the first three-dimensional test coordinate of the test picture corresponding to the color level value in the color level range to be compensated.
Optionally, the compensation method of the display module further includes:
and determining the standard color standard of the display module according to the color standard value included in the color standard structure.
In a second aspect, an embodiment of the present invention further provides a compensation apparatus for a display module, including:
the test picture determining module is used for determining target color coordinates and target brightness of the plurality of test pictures according to the color system of the display module and the white standard color coordinates;
the acquisition module is used for acquiring the test color coordinates and the test brightness of the display module under each test picture;
the color quasi structure determining module is used for determining a color quasi structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture;
and the compensation module is used for compensating the display module according to the color calibration structure.
According to the compensation method and device for the display panel, provided by the embodiment of the invention, the target color coordinates and the target brightness of a plurality of test pictures are determined according to the color system of the display module and the white standard color coordinates; acquiring a test color coordinate and a test brightness of the display module under each test picture; determining a color calibration structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture; and compensating the display module according to the color calibration structure. According to the technical scheme, when the color calibration structure is determined, the color coordinate factor is considered, the brightness factor is also considered, the calculation accuracy of the color calibration structure is increased, accurate compensation data can be obtained when the display module is compensated according to the color calibration structure, and the display picture quality of the display module can be improved. And the color accuracy structure comprises the color accuracy corresponding to a plurality of test pictures, so that the color accuracy structure can comprehensively reflect the color accuracy of the display module in the whole color gamut, and the display quality of the display picture is further improved after the display module is compensated according to the color accuracy structure.
Drawings
Fig. 1 is a flowchart of a compensation method for a display module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another exemplary embodiment of a compensation method for a display module;
fig. 3 is a schematic diagram of a color gamut range under a DCI-P3 coordinate system provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a compensation apparatus of a display module according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
As described in the background art, in the prior art, when performing the color calibration test and calculation of the display module, there is a problem that the color calibration calculation of the display module is inaccurate, so that the quality of the display image is still poor after the display module is compensated according to the color calibration of the display module. The inventor researches and finds that the above problem occurs because in the prior art, when the color calibration of the display module is tested, only the two-dimensional color coordinates of the display module are generally obtained, and the color calibration is calculated according to the two-dimensional color coordinates of the color displayed by the display module. However, when the two-dimensional color coordinates are the same and the brightness is different, the color displayed by the display module also has difference, so in the prior art, the color calibration calculation is performed only according to the two-dimensional color coordinates of the color displayed by the display module, and the display brightness factor is not considered, which results in inaccurate color calibration calculation. After the color calibration of the display module is obtained, the display module is usually compensated according to the color calibration, and inaccurate color calibration calculation leads to that correct compensation data cannot be obtained when the display module is compensated, so that the display image quality of the display module is still poor even after the compensation.
For the above reasons, an embodiment of the present invention provides a compensation method for a display module, and fig. 1 is a flowchart of the compensation method for a display module provided in the embodiment of the present invention, and referring to fig. 1, the compensation method for a display module includes:
specifically, the existing color systems include a plurality of color systems, such as CIE1976, CIE1931 and DCI-P3 color systems, and the color systems of different display modules may be different. The standard color coordinates of the same color may not be consistent for each color system. In this step, the target color coordinate and the target brightness of the test picture are determined according to the color system of the display module and the white standard color coordinate, for example, uniform point extraction may be performed in a CIE chromaticity diagram in the color system of the display module according to the white standard color coordinate and the red standard color coordinate, the green standard color coordinate, and the blue standard color coordinate in the color system of the display module, the number of the point extraction may be multiple, and the color coordinate corresponding to each point is used as the target color coordinate of one test picture. The target brightness of the test frame is calculated according to the white standard color coordinate, the target color coordinate of the test frame, and the red standard color coordinate, the green standard color coordinate, and the blue standard color coordinate of the color system of the display module, for example, the target brightness of the test frame may be obtained according to a preset correspondence relationship between the target brightness of the test frame and the white standard color coordinate, the target color coordinate of the test frame, and the red standard color coordinate, the green standard color coordinate, and the blue standard color coordinate of the color system of the display module.
Optionally, before the step 110, the method may include: and acquiring white standard color coordinates and white standard brightness of the display module under a standard white picture, wherein the standard white picture is a white picture under the maximum gray scale of sub-pixels of the display module.
Specifically, the data voltage corresponding to the maximum gray scale which can be displayed by the display module is provided for each sub-pixel in the display module by lighting the display module, so that the display module displays the white picture under the maximum gray scale as the standard white picture. And acquiring the color coordinate and the brightness of the standard white picture by an optical instrument, wherein the color coordinate and the brightness are respectively the white standard color coordinate and the white standard brightness under the standard white picture of the display module.
after the target color coordinate and the target brightness of the test picture are obtained in the step 110, the driving chip for driving the display module to display may obtain the display gray scale of the red sub-pixel, the display gray scale of the green sub-pixel, and the display gray scale of the blue sub-pixel corresponding to the display module under the test picture according to the target color coordinate, the target brightness, and an algorithm embedded in the driving chip or a preset target color coordinate, the target brightness, and the corresponding relationship between the gray scales of the sub-pixels with different colors, and provide data voltages corresponding to the gray scales of the red sub-pixel, the green sub-pixel, and the blue sub-pixel respectively to the red sub-pixel, the green sub-pixel, and the blue sub-pixel, so that the display module displays the test picture. After the display module displays the test picture, the test color coordinate and the test brightness can be obtained through the optical instrument, and the optical instrument can be connected with the drive chip of the display module, so that the drive chip can obtain the test color coordinate and the test brightness of the display panel from the optical instrument.
specifically, for any test picture, the color accuracy of the test picture can be determined according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to the test picture. Optionally, the corresponding relationship between the color standard and the target color coordinate, the test color coordinate, the target brightness and the test brightness may be preset, and when the color standard of the test picture is determined, the color standard may be determined according to the corresponding relationship between the preset color standard and the target color coordinate, the test color coordinate, the target brightness and the test brightness. The color space structure may include a color space corresponding to each test frame, so that the color space structure includes color spaces of a plurality of colors. In this step, when determining the color gamut structure, the luminance factor is taken into consideration in addition to the color coordinates, so that the determined color gamut structure is more accurate.
And 140, compensating the display module according to the color calibration structure.
As described above, when the color calibration structure is determined, not only the color coordinate factor but also the brightness factor are taken into consideration, so that the calculation accuracy of the color calibration structure is increased, and then when the display module is compensated according to the color calibration structure, accurate compensation data can be obtained, and the display image quality of the display module can be improved. And the color calibration structure comprises the color calibration corresponding to a plurality of test pictures instead of the color calibration of a single test picture, so that the color calibration structure can comprehensively reflect the color calibration of the display module in the whole color gamut, and the display quality of the display picture is further improved after the display module is compensated according to the color calibration structure.
In the compensation method for the display panel provided by this embodiment, the target color coordinates and the target brightness of a plurality of test pictures are determined according to the color system of the display module and the white standard color coordinates; acquiring a test color coordinate and a test brightness of the display module under each test picture; determining a color calibration structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture; and compensating the display module according to the color calibration structure. According to the technical scheme, when the color calibration structure is determined, the color coordinate factor is considered, the brightness factor is also considered, the calculation accuracy of the color calibration structure is increased, accurate compensation data can be obtained when the display module is compensated according to the color calibration structure, and the display picture quality of the display module can be improved. And the color calibration structure comprises the color calibration corresponding to a plurality of test pictures, so that the color calibration structure can comprehensively reflect the color calibration of the display module in the whole color gamut, and the display quality of the display picture is further improved after the display module is compensated according to the color calibration structure.
Fig. 2 is another compensation method for a display module according to an embodiment of the present invention, and referring to fig. 2, the compensation method for a display module includes:
and step 211, determining a red standard color coordinate, a green standard color coordinate and a blue standard color coordinate according to a color system of the display module.
As described in the foregoing embodiments, the standard color coordinates of the same color in each color system may be inconsistent, so that after the color system of the display module is determined, the red standard color coordinates, the green standard color coordinates, and the blue standard color coordinates in the color system are fixed values. Fig. 3 is a schematic diagram of a color gamut range under a DCI-P3 coordinate system provided in an embodiment of the present invention, where an abscissa u 'represents a first chromaticity and an ordinate v' represents a second chromaticity. Referring to fig. 3, exemplarily, for a display module of DCI-P3 color system, a red standard color coordinate R is (0.4964, 0.5255), a green standard color coordinate G is (0.0986, 0.5777), and a blue standard color coordinate B is (0.1754, 0.1579). And the coordinate point corresponding to the white standard color coordinate is positioned in a triangle formed by the coordinate point corresponding to the red standard color coordinate, the coordinate point corresponding to the green standard color coordinate and the coordinate point corresponding to the blue standard color coordinate.
And step 212, determining the target color coordinate of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate.
Because the display module can display a plurality of colors, for example, most of the existing display modules can display 1.67 million colors, when the target color coordinates of the test picture are determined, the picture corresponding to each color cannot be tested in consideration of the problem of test efficiency, therefore, when the target color coordinates of the test picture are determined, the target color coordinates of a plurality of test pictures which are expected to be determined can be uniformly distributed in a triangle formed by the red standard color coordinates, the green standard color coordinates and the blue standard color coordinates as far as possible, and further, the test picture can reflect the color levels of the colors of the display module which are uniformly distributed in different color ranges in the whole color gamut.
In order to ensure that the target color coordinates of the plurality of test frames are distributed as uniformly as possible in the triangle formed by the red standard color coordinate, the green standard color coordinate and the blue standard color coordinate, with reference to fig. 3, the step 212 may include:
and 2121, respectively performing a equal division on a connecting line of the white standard color coordinate and the red standard color coordinate, a connecting line of the white standard color coordinate and the green standard color coordinate, and a connecting line of the white standard color coordinate and the blue standard color coordinate in a CIE chromaticity diagram coordinate system to obtain a plurality of first equal division points, wherein a is more than or equal to 3.
Specifically, a, equally dividing a connecting line between the white standard color coordinate and the red standard color coordinate, wherein a first dividing point of the connecting line between the white standard color coordinate and the red standard color coordinate can correspond to color coordinates corresponding to (a-1) colors between the standard white color and the standard red color; similarly, the first point of the line between the white standard color coordinates and the green standard color coordinates may correspond to color coordinates corresponding to (a-1) colors between the standard white and the standard green; the first equally divided point of the line between the white standard color coordinates and the blue standard color coordinates may correspond to color coordinates corresponding to (a-1) colors between the standard white and the standard blue. By this step, color coordinates of colors uniformly distributed between the standard white and the standard red, the standard white and the standard green, and the standard white and the standard blue can be obtained.
And step 2122, equally dividing a connecting line b of the red standard color coordinate and the green standard color coordinate in a CIE chromaticity diagram coordinate system, equally dividing a connecting line c of the red standard color coordinate and the blue standard color coordinate, and equally dividing a connecting line d of the green standard color coordinate and the blue standard color coordinate to obtain a plurality of second equally divided points, wherein b is more than or equal to 3, c is more than or equal to 3, and d is more than or equal to 3.
Specifically, a connecting line b between the red standard color coordinate and the green standard color coordinate is divided equally, so that a second bisector of the connecting line between the white standard color coordinate and the red standard color coordinate can correspond to color coordinates corresponding to (b-1) colors between the standard red color and the standard green color; similarly, a second bisector of the connecting line between the red standard color coordinates and the blue standard color coordinates may correspond to color coordinates corresponding to (c-1) colors between the standard red and the standard blue; the second bisector point of the connecting line between the green standard color coordinates and the blue standard color coordinates may correspond to color coordinates corresponding to (d-1) colors between the standard green and the standard blue. By this step, color coordinates of colors uniformly distributed between the standard red and the standard green, the standard red and the standard blue, and the standard green and the standard blue can be obtained.
And step 2123, equally dividing a connecting line a between the white standard color coordinate and the second equally divided point in the CIE chromaticity diagram coordinate system to obtain a plurality of third equally divided points.
Specifically, in step 2121, a connection line between the white standard color coordinate and the red standard color coordinate, a connection line between the white standard color coordinate and the green standard color coordinate, and a connection line between the white standard color coordinate and the blue standard color coordinate at the same bisector may form a triangle, where the triangle is similar to a triangle formed by a coordinate point of the red standard color coordinate corresponding to the standard red, a coordinate point of the green standard color coordinate corresponding to the standard green, and a coordinate point of the blue standard color coordinate corresponding to the standard blue. And the third equally dividing points obtained by equally dividing the connecting line of the white standard brick color coordinate and the second equally dividing points are all positioned on a triangle similar to a triangle formed by a red standard color coordinate corresponding to the standard red, a green standard color coordinate corresponding to the standard green and a blue standard color coordinate corresponding to the standard blue, so that the third equally dividing points are uniformly distributed in a triangle formed by a red standard color coordinate corresponding to the standard red, a green standard color coordinate corresponding to the standard green and a blue standard color coordinate corresponding to the standard blue.
In addition, the inventor researches to find that the color levels of the colors of the areas near the coordinate points corresponding to the red standard color coordinates are more prone to be deviated, therefore, optionally, b is more than d, c is more than d, further, the number of second equally divided points on a connecting line of the red standard color coordinates and the green standard color coordinates is more than that of second equally divided points on a connecting line of the green standard color coordinates and the blue standard color coordinates, the number of second equally divided points on a connecting line of the red standard color coordinates and the blue standard color coordinates is more than that of second equally divided points on a connecting line of the green standard color coordinates and the blue standard color coordinates, correspondingly, the number of the coordinate points corresponding to the standard white color coordinates and the third equally divided points on the connecting line of the second equally divided points can be relatively more in the areas near the standard red, and further, the number of the coordinate points near the coordinate points corresponding to the red standard color coordinates in a plurality of test pictures is ensured to be more, when the display panel is compensated according to the color calibration structure of a plurality of test pictures, the display module can be compensated more when displaying the color corresponding to the coordinate point of the area near the coordinate point corresponding to the red standard color coordinate, and the whole display effect of the pictures is improved.
Optionally, a is 4, b is c is 4, and d is 3, so as to ensure that the number of the test pictures is not excessive on the basis that the test pictures can cover a wider range of colors and are distributed uniformly, which is beneficial to improving the test and compensation efficiency.
And step 2124, determining the color coordinates corresponding to each first bisector, each second bisector and each third bisector, and the red standard color coordinates, the green standard color coordinates, the blue standard color coordinates and the white standard color coordinates as target color coordinates of the plurality of test pictures.
The first bisector, the second bisector, the third bisector, and the coordinate points corresponding to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate, and the white standard color coordinate, which are obtained through the above-mentioned steps 2121-2123, are relatively uniformly distributed in the whole color gamut, so that the target color coordinate of each test picture is relatively uniformly distributed in the whole color gamut, at the same time, the color range covered by the determined target color coordinate of the test picture is relatively large, and it is ensured that the color level structure obtained according to each test picture can reflect the color level of the display module in different color ranges in the whole color gamut.
And step 213, determining the target brightness of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the target color coordinate of the test picture.
Optionally, step 213 includes:
and 2131, determining the brightness ratio of the standard white picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate.
Specifically, the luminance ratio under the standard white picture includes a red luminance ratio under the standard white picture, a green luminance ratio under the standard white picture, and a blue luminance ratio under the standard white picture.
In step 2131, the luminance ratio under the standard white picture can be specifically calculated according to the following formula:
wherein (Rx, Ry) represents red standard color coordinates, (Gx, Gy) represents green standard color coordinates, (Bx, By) represents blue standard color coordinates, (Wx, Wy) represents white standard color coordinates, wherein,
Rz-Rx-Ry; Gz-1-Gx-Gy; wz is 1-Wx-Wy; in the formula, r 1 G represents the ratio of red brightness in a standard white picture 1 Representing the ratio of green brightness in a standard white picture, b 1 Indicating the ratio of blue light intensity in a standard white picture.
2132, determining the brightness ratio of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the target color coordinate of the test picture;
specifically, the luminance ratio under the test picture includes a red luminance ratio under the test picture, a green luminance ratio under the test picture, and a blue luminance ratio under the test picture.
In step 2132, the luminance ratio under the test picture may be specifically calculated according to the following formula:
wherein (Rx, Ry) represents red standard color coordinates, (Gx, Gy) represents green standard color coordinates, (Bx, By) represents blue standard color coordinates, (Cx, Cy) represents target color coordinates of the test screen, and wherein,
Rz-Rx-Ry; Gz-1-Gx-Gy; Cz-1-Cx-Cy; in the formula, r 2 Representing the ratio of the luminance of red light under the test picture, g 2 Representing the green light brightness ratio under the test picture, b 2 Indicating the ratio of the luminance of blue light in the test picture.
Step 2133, determining a red gray scale, a green gray scale and a blue gray scale under the test picture according to the brightness ratio under the test picture and the brightness ratio under the standard white picture;
specifically, the red gray scale may refer to a display gray scale of a red sub-pixel in the display module, the green gray scale may refer to a display gray scale of a green sub-pixel in the display module, and the blue gray scale may refer to a display gray scale of a blue sub-pixel in the display module.
Optionally, the red gray scale, the green gray scale and the blue gray scale under the test picture may be determined by the following formulas respectively:
(Rr/255)^2.2＝r 2 /r 1 ；
(Gg/255)^2.2＝g 2 /g 1 ；
(Bb/255)^2.2＝b 2 /b 1 ；
wherein Rr represents the red gray scale under the test picture, Gg represents the green gray scale under the test picture, and Bb represents the blue gray scale under the test picture.
And 2134, determining the target brightness of the test picture according to the red gray scale, the green gray scale and the blue gray scale.
Optionally, a corresponding relationship between a red gray scale and a red light brightness, a corresponding relationship between a green gray scale and a green brightness, and a corresponding relationship between a blue gray scale and a blue brightness are preset in the driving chip, and then after the red gray scale, the green gray scale, and the blue gray scale in the test picture are determined, the red light brightness, the green light brightness, and the blue light brightness in the test picture can be obtained, and the target brightness of the test picture can be the sum of the red light brightness, the green light brightness, and the blue light brightness in the test picture.
And step 220, obtaining the test color coordinates and the test brightness of the display module under each test picture.
Specifically, after the red gray scale, the green gray scale and the blue gray scale under the test picture are obtained in step 210, the driving chip may obtain the data voltages respectively corresponding to the red sub-pixel, the green sub-pixel and the blue sub-pixel under the test picture according to the corresponding relationship between the red gray scale and the data voltage, the corresponding relationship between the green gray scale and the data voltage, and the corresponding relationship between the blue gray scale and the data voltage, and the driving chip provides the data voltages to the red sub-pixel, the green sub-pixel and the blue sub-pixel respectively, and then the display module displays the test picture.
231, converting a first three-dimensional target coordinate consisting of a target color coordinate and target brightness corresponding to each test picture into a Lab color model according to a preset corresponding relation to obtain a second three-dimensional target coordinate corresponding to the three-dimensional target coordinate of each test picture in the Lab color model, wherein the second three-dimensional target coordinate comprises a target conversion color coordinate and target conversion brightness;
specifically, the preset corresponding relationship may include a first preset corresponding relationship and a second preset corresponding relationship, wherein the first preset corresponding relationship may be a corresponding relationship when the target color coordinate and the target brightness are converted from a first three-dimensional target coordinate in the first three-dimensional coordinate system to an intermediate three-dimensional target coordinate in the intermediate three-dimensional coordinate system, wherein,
Y m ＝L；
wherein (x, y, L) represents a first three-dimensional target coordinate; (X) m ，Y m ，Z m ) Representing the intermediate three-dimensional object coordinates.
The second preset corresponding relationship may be a corresponding relationship when the intermediate three-dimensional target coordinate is converted to the second three-dimensional target coordinate, and the corresponding relationship is a corresponding relationship when the XYZ coordinate system is converted to the Lab color model in the prior art, and is not described herein again.
232, converting the first three-dimensional test coordinate consisting of the test color coordinate and the test brightness of each test picture into a Lab color model according to a preset corresponding relation to obtain a second three-dimensional test coordinate corresponding to each test picture, wherein the second three-dimensional test coordinate comprises a test conversion color coordinate and a test conversion brightness;
the determination method of the second three-dimensional test coordinate is the same as the determination method of the second three-dimensional target coordinate, and is not described herein again.
Step 233, for each test frame, calculating a color standard value according to the target conversion color coordinate, the target conversion brightness, the test conversion color coordinate and the test conversion brightness;
specifically, for each test frame, the color timing can be calculated by the following formula,
DetaE＝(ΔL) 2 +(Δa) 2 +(Δb) 2 ；
where, DetaE represents a color standard value, Δ L ═ L 1 -L 2 L1 denotes target conversion luminance, L2 denotes test conversion luminance, a 1 Representing a first shade in target converted color coordinates, a 2 Representing a first chromaticity in test conversion coordinates, b 1 Representing a second shade in the target converted color coordinates, b 2 Presentation test conversion seatA second shade in the target.
And step 234, determining the color level value corresponding to each test picture as a color level structure.
And after the color standard value corresponding to each test picture is determined, the color standard value corresponding to the color standard value of each test picture forms a color standard structure of the display module.
And 241, determining a color space range to be compensated according to the color space structure.
When the color level range to be compensated is determined, the color level range to be compensated can be determined according to the distribution of the color level values in the color level structure; optionally, in the color structure, according to a descending order, the minimum color level value to the first color level value are determined as a color level range to be compensated, wherein the number of the color level values between the minimum color level value and the first color level value accounts for a preset proportion of the number of the color level values included in the whole color structure; in the color quasi structure, according to the descending order, the range from the maximum color quasi value to the second color quasi value is determined as the color quasi range to be compensated, wherein the number of the color quasi values from the maximum color quasi value to the second color quasi value accounts for the preset proportion of the number of the color quasi values included in the whole color quasi structure; the color calibration range to be compensated may also be determined from the minimum color calibration value to the first color calibration value and from the maximum color calibration value to the second color calibration value, or may be determined according to other preset manners, which is not specifically limited herein.
And 242, compensating the data voltage of the sub-pixel of at least one color in the display module according to the difference between the first three-dimensional target coordinate and the first three-dimensional test coordinate of the test picture corresponding to the color level value in the color level range to be compensated.
After the color calibration range to be compensated is determined, the display panel can be compensated according to the difference between the first three-dimensional target coordinate and the first three-dimensional test coordinate of the test picture corresponding to the color calibration value in the color calibration range to be compensated, specifically, the color of which color light under the test picture is inaccurate can be determined according to the difference between the first three-dimensional target coordinate and the first three-dimensional test coordinate, and then the data voltage of the sub-pixel corresponding to the color light is adjusted. Optionally, the driving chip may pre-store a corresponding relationship between a difference between the first three-dimensional target coordinate and the first three-dimensional test coordinate and compensation data of each color sub-pixel, where the compensation data may be a data voltage, and then obtain compensation data according to the difference between the stored first three-dimensional target coordinate and the stored first three-dimensional test coordinate, and compensate the display module according to the compensation data.
Optionally, the compensation method of the display module further includes: and determining the standard color standard of the display module according to the color standard value included in the color standard structure.
Specifically, in order to characterize the degree of color accuracy of the display module, a representative color accuracy value needs to be determined as the standard color accuracy. Specifically, how to obtain the standard color standard according to the color standard structure may be a manner of averaging all color standard values in the color standard structure, a manner of taking a maximum value or a minimum value, or another statistical manner, and this embodiment is not specifically limited herein.
The embodiment of the present invention further provides a compensation apparatus for a display module, fig. 4 is a schematic structural diagram of the compensation apparatus for a display module provided in the embodiment of the present invention, and referring to fig. 4, optionally, the compensation apparatus for a display module includes:
the test picture determining module 310 is configured to determine target color coordinates and target brightness of a plurality of test pictures according to a color system of the display module and the white standard color coordinates;
the obtaining module 320 is configured to obtain a test color coordinate and a test brightness of the display module in each test picture;
the color structure determining module 330 is configured to determine a color structure according to the target color coordinate, the test color coordinate, the target brightness, and the test brightness corresponding to each test frame;
and the compensation module 340 is used for compensating the display module according to the color calibration structure.
According to the compensation device of the display module, the target color coordinates and the target brightness of a plurality of test pictures are determined through the test picture determining module according to the color system of the display module and the white standard color coordinates; the acquisition module acquires the test color coordinates and the test brightness of the display module under each test picture; the color calibration structure determining module determines a color calibration structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture; the compensation module compensates the display module according to the color calibration structure. According to the technical scheme, when the color calibration structure is determined, the color coordinate factor is considered, the brightness factor is also considered, the calculation accuracy of the color calibration structure is increased, accurate compensation data can be obtained when the display module is compensated according to the color calibration structure, and the display picture quality of the display module can be improved. And the color accuracy structure comprises the color accuracy corresponding to a plurality of test pictures, so that the color accuracy structure can comprehensively reflect the color accuracy of the display module in the whole color gamut, and the display module is compensated according to the color accuracy structure, thereby being beneficial to further improving the display quality of the display picture.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. A compensation method of a display module is characterized by comprising the following steps:
determining target color coordinates and target brightness of a plurality of test pictures according to the color system of the display module and the white standard color coordinates;
acquiring the test color coordinates and the test brightness of the display module under each test picture;
determining a color calibration structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture;
compensating the display module according to the color calibration structure;
wherein, the determining the target color coordinates and the target brightness of the plurality of test pictures according to the color system of the display module and the white standard color coordinates comprises:
determining a red standard color coordinate, a green standard color coordinate and a blue standard color coordinate according to the color system of the display module;
determining a target color coordinate of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate;
determining a target color coordinate of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate, wherein the determining the target color coordinate of the test picture comprises:
in a CIE chromaticity diagram coordinate system, a equal division is respectively carried out on a connecting line of the white standard color coordinate and the red standard color coordinate, a connecting line of the white standard color coordinate and the green standard color coordinate, and a connecting line of the white standard color coordinate and the blue standard color coordinate to obtain a plurality of first equal division points, wherein a is more than or equal to 3;
in a CIE chromaticity diagram coordinate system, equally dividing a connecting line b of the red standard color coordinate and the green standard color coordinate, equally dividing a connecting line c of the red standard color coordinate and the blue standard color coordinate, and equally dividing a connecting line d of the green standard color coordinate and the blue standard color coordinate to obtain a plurality of second equally divided points, wherein b is more than or equal to 3, c is more than or equal to 3, and d is more than or equal to 3;
in a CIE chromaticity diagram coordinate system, equally dividing a connecting line a of the white standard color coordinate and the second equally dividing point to obtain a plurality of third equally dividing points;
and respectively determining the color coordinates corresponding to each first equant point, each second equant point and each third equant point, and the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate as target color coordinates of the plurality of test pictures.
2. The compensation method for the display module according to claim 1, wherein b is greater than or equal to d, and c is greater than or equal to d;
preferably, a =4, b = c =4, d = 3.
3. The method as claimed in claim 1, wherein determining the target luminance of the test frame according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the target color coordinate of the test frame comprises:
determining the brightness ratio under a standard white picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate;
determining the brightness ratio under the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the target color coordinate of the test picture;
determining a red gray scale, a green gray scale and a blue gray scale under the test picture according to the brightness ratio under the test picture and the brightness ratio under the standard white picture;
and determining the target brightness of the test picture according to the red gray scale, the green gray scale and the blue gray scale.
4. The method as claimed in claim 1, further comprising, before determining the target color coordinates and the target brightness of the plurality of test frames according to the color system of the display module and the white standard color coordinates:
and acquiring a white standard color coordinate and a white standard brightness of the display module under a standard white picture, wherein the standard white picture is a white picture under the maximum gray scale displayed by sub-pixels in the display module.
5. The method for compensating a display module according to claim 4, wherein the determining a color calibration structure according to the target color coordinates, the test color coordinates, the target brightness and the test brightness corresponding to each of the test frames comprises:
converting a target color coordinate and a first three-dimensional target coordinate consisting of target brightness corresponding to each test picture into a Lab color model according to a preset corresponding relation, and obtaining a second three-dimensional target coordinate corresponding to the three-dimensional target coordinate corresponding to each test picture in the Lab color model, wherein the second three-dimensional target coordinate comprises a target conversion color coordinate and target conversion brightness;
converting a first three-dimensional test coordinate consisting of the test color coordinate and the test brightness of each test picture into the Lab color model according to a preset corresponding relation to obtain a second three-dimensional test coordinate corresponding to each test picture, wherein the second three-dimensional test coordinate comprises a test conversion color coordinate and a test conversion brightness;
for each test picture, calculating a color standard value according to the target conversion color coordinate, the target conversion brightness, the test conversion color coordinate and the test conversion brightness;
and determining the color level value corresponding to each test picture as a color level structure.
6. The method for compensating the display module according to claim 5, wherein the compensating the display module according to the color calibration structure comprises:
determining a color space range to be compensated according to the color space structure;
and compensating the data voltage of the sub-pixel of at least one color in the display module according to the difference between the first three-dimensional target coordinate and the first three-dimensional test coordinate of the test picture corresponding to the color level value in the color level range to be compensated.
7. The compensation method for the display module according to claim 5, further comprising:
and determining the standard color standard of the display module according to the color standard value included in the color standard structure.
8. The utility model provides a compensation arrangement of display module assembly which characterized in that includes:
the test picture determining module is used for determining target color coordinates and target brightness of a plurality of test pictures according to the color system of the display module and the white standard color coordinates;
the acquisition module is used for acquiring the test color coordinates and the test brightness of the display module under each test picture;
the color quasi structure determining module is used for determining a color quasi structure according to the target color coordinate, the test color coordinate, the target brightness and the test brightness corresponding to each test picture;
the compensation module is used for compensating the display module according to the color calibration structure;
wherein, the determining the target color coordinates and the target brightness of the plurality of test pictures according to the color system of the display module and the white standard color coordinates comprises:
determining a red standard color coordinate, a green standard color coordinate and a blue standard color coordinate according to the color system of the display module;
determining a target color coordinate of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate;
determining the target brightness of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the target color coordinate of the test picture; determining a target color coordinate of the test picture according to the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate, wherein the determining the target color coordinate of the test picture comprises:
in a CIE chromaticity diagram coordinate system, respectively carrying out a equal division on a connecting line of the white standard color coordinate and the red standard color coordinate, a connecting line of the white standard color coordinate and the green standard color coordinate, and a connecting line of the white standard color coordinate and the blue standard color coordinate to obtain a plurality of first equal division points, wherein a is more than or equal to 3;
in a CIE chromaticity diagram coordinate system, equally dividing a connecting line b of the red standard color coordinate and the green standard color coordinate, equally dividing a connecting line c of the red standard color coordinate and the blue standard color coordinate, and equally dividing a connecting line d of the green standard color coordinate and the blue standard color coordinate to obtain a plurality of second equally divided points, wherein b is more than or equal to 3, c is more than or equal to 3, and d is more than or equal to 3;
in a CIE chromaticity diagram coordinate system, equally dividing a connecting line a of the white standard color coordinate and the second equally dividing point to obtain a plurality of third equally dividing points;
and respectively determining the color coordinates corresponding to each first equant point, each second equant point and each third equant point, and the red standard color coordinate, the green standard color coordinate, the blue standard color coordinate and the white standard color coordinate as target color coordinates of the plurality of test pictures.
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