Color difference adjustment method and liquid crystal display screen

Abstract

The application discloses a color difference adjustment method and a liquid crystal display screen. The color difference adjustment method calls a first color calibration matrix in a display mode through an sRGB color space, calls a second color calibration matrix in the display mode through a DCI-P3 color space, and configures the third color calibration matrix in other modes through the DCI-P3 color space according to color coordinate differences, so that the color shown by the DCI-P3 color space in the other modes is closer to the color shown by the sRGB color space in the display mode, thereby reducing the color difference between the DCI-P3 color space and the sRGB color space in different modes, and further improving the display color difference between different color gamuts.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a color difference adjustment method and a liquid crystal display. BACKGROUND

[0002] With the increasing diversification of people's demand for display screens, dynamic switching between different color gamuts can bring each color space to the extreme and achieve the effect of presenting different images in original colors.

[0003] However, while different color gamut switching can achieve the display needs of different application scenarios, there are also some display color difference problems between different color gamuts. SUMMARY

[0004] The present application provides a color difference adjustment method and a liquid crystal display to solve the technical problem of display color difference between different color gamuts.

[0005] In a first aspect, the present application provides a color difference adjustment method, which is applied to a display screen, the display screen has an sRGB color space and a DCI-P3 color space, the display screen also has a display mode and other modes, the color difference adjustment method comprises: determining the color coordinate difference between the color coordinates displayed in the sRGB color space and the color coordinates displayed in the DCI-P3 color space; establishing a color calibration matrix library, the color calibration matrix library includes a first color calibration matrix, a second color calibration matrix and a third color calibration matrix, the sRGB color space calls the first color calibration matrix in the display mode, the DCI-P3 color space calls the second color calibration matrix in the display mode; according to the color coordinate difference, the DCI-P3 color space calls the third color calibration matrix in the other modes.

[0006] In some embodiments, the other modes include a photographing mode, and according to the color coordinate difference, the DCI-P3 color space calls the third color calibration matrix in the other modes, which includes: according to the color coordinate difference, the DCI-P3 color space calls the third color calibration matrix in the photographing mode.

[0007] In some embodiments, establishing the color calibration matrix library includes: obtaining the target color coordinates of the white picture of the DCI-P3 color space in the photographing mode, the standard color points of the DCI-P3 color space; determining the third color calibration matrix based on the target color coordinates and the standard color points.

[0008] In some embodiments, determining the third color calibration matrix based on the target color coordinates and the standard color points includes: converting the target color coordinates into corresponding tristimulus value coordinates, Y in the tristimulus value under the white picture is 1; determining the third color calibration matrix based on the tristimulus value coordinates and the standard color points.

[0009] In some embodiments, determining the third color calibration matrix based on the tristimulus value coordinates and the standard color point comprises: converting the color coordinates of the standard color point into a corresponding color coordinate matrix; determining an intermediate matrix based on the tristimulus value coordinates and the color coordinate matrix; and determining the third color calibration matrix according to the color coordinate matrix and the intermediate matrix.

[0010] In some embodiments, determining the intermediate matrix based on the tristimulus value coordinates and the color coordinate matrix comprises: obtaining an inverse matrix of the color coordinate matrix according to the color coordinate matrix; and obtaining the intermediate matrix according to the product of the inverse matrix of the color coordinate matrix and the tristimulus value coordinates.

[0011] In some embodiments, determining the third color calibration matrix according to the color coordinate matrix and the intermediate matrix comprises: converting the intermediate matrix into a corresponding multi-dimensional matrix; and obtaining the third color calibration matrix according to the product of the color coordinate matrix and the multi-dimensional matrix.

[0012] In some embodiments, the color gamut of the DCI-P3 color space is wider than the color gamut of the sRGB color space.

[0013] In some embodiments, the display screen further has an Adobe color space, and the color difference adjustment method further comprises: selecting the sRGB color space, the DCI-P3 color space or the Adobe color space for display according to an application scenario.

[0014] In a second aspect, the present application provides a liquid crystal display screen, which executes the color difference adjustment method described above.

[0015] The color difference adjustment method and the liquid crystal display screen provided by the present application can make the colors exhibited by the DCI-P3 color space in other modes closer to the colors exhibited by the sRGB color space in the display mode, so as to reduce the color difference between the DCI-P3 color space and the sRGB color space in different modes, and further improve the problem of display color difference between different color gamuts. BRIEF DESCRIPTION OF DRAWINGS

[0016] The technical solutions and other beneficial effects of the present application will become apparent through the following detailed description of specific embodiments of the present application in conjunction with the accompanying drawings.

[0017] Figure 1 A contrast diagram of a portrait picture in different color gamuts in the related art.

[0018] Figure 2A schematic diagram of 1931 CIE-XYZ chromaticity in the related art.

[0019] Figure 3 A contrast schematic diagram of the spectrum in different color gamuts.

[0020] Figure 4 A schematic diagram of the flow of the color difference adjustment method provided by the embodiments of the present application.

[0021] Figure 5 A schematic diagram of the color point difference of different color gamuts before adjustment.

[0022] Figure 6 A schematic diagram of the color point change of different color gamuts after adjustment.

[0023] Figure 7 A schematic diagram of the structure of the liquid crystal display provided by the embodiments of the present application.

[0024] Figure 8 A schematic diagram of the structure of the calling module. Figure 7 A schematic diagram of the structure of the calling module. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0026] In addition, the terms "first", "second" are only used for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features, so that the features with "first" and "second" can explicitly or implicitly include one or more of the features, and in the description of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0027] With the increasing diversification of the demand for display screens, dynamic switching between different color gamuts can bring each color space to the extreme, achieving the effect of presenting different images in original colors. Among them, different color gamuts can include sRGB color space, DCI-P3 color space, and Adobe color space.

[0028] Color gamut switching display technology refers to supporting dynamic switching between DCI-P3 color space, Adobe, sRGB color space, so as to achieve an ultra-high standard with a mean value (delta E) of color calibration ability less than 1. Flexible switching can be performed according to the visual needs of different application scenarios (such as entertainment, daily office work, professional application, etc.), realizing the matching of display and image color gamut.

[0029] However, different color gamut switching can realize the display requirements of different application scenarios, while there are some display color difference problems between different color gamuts, such as when the display screen is used to take pictures with a camera, the DCI-P3 color space and the sRGB color space have different red and green colors, and compared with the portrait picture presented by the sRGB color space, the portrait picture presented by the DCI-P3 color space will show redness, as shown in Figure 1 .

[0030] The specific reasons why the portrait picture shows redness when taking pictures are as follows: there are differences between the DCI-P3 color space and the sRGB color space in the display process, that is, the same picture shows different color points. For example, a pure color picture of skin with RGB gray levels of 142 / 117 / 120, the color coordinates displayed in the DCI-P3 color space are (0.346, 0.320), and the color coordinates displayed in the sRGB color space are (0.337, 0.319), as shown in Figure 2 . Figure 3 The spectrum results shown in Figure 2 match the redness of the color points in the DCI-P3 color space.

[0031] Among them, in Figure 3 , the curve represented by S1 represents the proportion of red color under the corresponding wavelength in the sRGB color space. The rectangular dashed box represents the proportion of red color under the corresponding wavelength in the DCI-P3 color space. It can be seen that in the oval dashed box, the rectangular dashed box is higher than S1 on the vertical axis, which means that the proportion of red color (R) in the DCI-P3 color space is greater than that in the sRGB color space.

[0032] In view of the above-mentioned problem of display color difference between different color gamuts, the embodiment provides a color difference adjustment method, which is applied to a display screen, the display screen has an sRGB color space and a DCI-P3 color space, and the display screen also has other display modes and other application scenario modes. As shown in Figure 4 , the color difference adjustment method comprises the following steps:

[0033] Step S10: determining the color coordinate difference between the color coordinates displayed in the sRGB color space and the color coordinates displayed in the DCI-P3 color space.

[0034] Step S20: establishing a color calibration matrix library.

[0035] Step S30: calling the third color calibration matrix in other modes according to the color coordinate difference configuration DCI-P3 color space.

[0036] The color calibration matrix library includes the first color calibration matrix, the second color calibration matrix, and the third color calibration matrix, the sRGB color space calls the first color calibration matrix in the display mode, and the DCI-P3 color space calls the second color calibration matrix in the display mode.

[0037] It can be understood that the color difference adjustment method and the liquid crystal display provided by the embodiment can make the colors shown by the DCI-P3 color space in other modes closer to the colors shown by the sRGB color space in the display mode by calling the first color calibration matrix in the display mode according to the sRGB color space, calling the second color calibration matrix in the display mode according to the DCI-P3 color space, and calling the third color calibration matrix in other application scenario modes according to the color coordinate difference configuration DCI-P3 color space, thereby reducing the color difference between the DCI-P3 color space and the sRGB color space in different modes, and further improving the display color difference between different color gamuts.

[0038] It should be noted that the DCI-P3 color space is a wide color gamut standard proposed by the American film industry, and is also one of the color standards of the current digital film playback device. The color gamut coverage of the DCI-P3 color space is wider, and the color gamut coverage is increased by 25% compared with the sRGB color space. Therefore, the color calibration matrix under the DCI-P3 color space is selected for adjustment in the present application, which has a larger adjustable range and does not have a dead angle that cannot be adjusted. Of course, in other embodiments, the color calibration matrix under the sRGB color space can also be selected for adjustment according to the inventive concept of the present application, although the adjustable range is smaller, but the corresponding beneficial effects can still be achieved.

[0039] In one embodiment, the display screen also has an Adobe color space, and the display screen or the user can select the sRGB color space, the DCI-P3 color space, or the Adobe color space for display according to the application scenario. This can realize more different color gamut switching, and is more conducive to achieving the effect of presenting different images in original colors.

[0040] The Adobe color space is a color standard developed by Adobe Company in 1998, which increases the CMYK color gamut based on the sRGB color space, and is mainly improved in the cyan and green color system compared with the sRGB color space, and is more widely used in the printing industry, flat packaging, and printing design field.

[0041] In one of the embodiments, the other application scene modes include a photographing mode, the third color calibration matrix is called in the other modes according to the color coordinate difference configuration DCI-P3 color space, including: the third color calibration matrix is called in the photographing mode according to the color coordinate difference configuration DCI-P3 color space.

[0042] It should be noted that the display mode refers to the normal display of the display screen, for example, displaying a static picture or a dynamic picture. Unlike the display mode, the other modes can also be sensing recognition modes, such as touch mode or fingerprint recognition mode, etc.

[0043] The color calibration matrix library is established as follows, and Table 1 as shown below is the standard color points under different color gamuts.

[0044]

[0045] These standard color points can be known in advance. Taking the target color coordinates of the white picture in the DCI-P3 color space in the display mode as an example, (0.3127, 0.3290), the following matrix can be obtained based on these standard color points:

[0046]

[0047]

[0048]

[0049]

[0050] wherein w xyz is obtained based on the target color coordinates of the white picture in the DCI-P3 color space in the display mode. Let Y in the three stimulus values under the white picture be 1, then w xyz can be converted into the corresponding three stimulus value coordinates w XYZ , and the calculation formula is as follows:

[0051]

[0052] w XYZ can also be obtained through the following formulas 1-6:

[0053]

[0054] wherein, is the color coordinate matrix, and it can be seen that the color coordinate matrix is obtained by converting the color coordinates of the standard color points.

[0055] The formulas 1-6 can be transformed to obtain the following formula 1-7:

[0056]

[0057] wherein, is the inverse matrix of the color coordinate matrix. is an intermediate matrix.

[0058] is a multi-dimensional matrix converted from the intermediate matrix.

[0059] Then the second color calibration matrix (M) can be obtained as follows:

[0060]

[0061] Based on the above calculation process, the matrices corresponding to different target color coordinates in the sRGB color space and other specific color spaces can be obtained. Based on this, taking the target color coordinate (0.3127, 0.3290) in the sRGB color space as an example, the first color calibration matrix is shown in Table 2 as follows:

[0062]

[0063] Under the DCI-P3 color space, when the target color coordinate changes, for example, changes to (0.3037, 0.3280), the third color calibration matrix calculation process is as follows:

[0064]

[0065] wherein, w xyz is obtained based on the target color coordinate of the white picture in the shooting mode under the DCI-P3 color space. Let Y in the three stimulus values under the white picture be 1, then w xyz can be converted into the corresponding three stimulus value coordinate w XYZ , and the calculation formula is as follows:

[0066]

[0067] is a color coordinate matrix, and it can be seen that the color coordinate matrix is obtained by converting the color coordinates of the standard color points.

[0068] The formula 1-6 can be transformed to obtain the following formula 2-7:

[0069]

[0070] wherein, is the inverse matrix of the color coordinate matrix. is an intermediate matrix.

[0071] is a multi-dimensional matrix converted from the intermediate matrix.

[0072] Thus, a third color calibration matrix (M) can be obtained:

[0073]

[0074] For example, a pure color picture of a skin with RGB gray scales of (142, 117, 120) has color coordinates of (0.346, 0.320) in the DCI-P3 color space and color coordinates of (0.337, 0.319) in the sRGB color space,

[0075] When the camera is used to take a picture, according to the color coordinate difference of the portrait picture in the DCI-P3 color space and the sRGB color space (for example, the color coordinates in the DCI-P3 color space are (Wx, Wy), and the color coordinates in the sRGB color space are (Wx-0.009, Wy-0.001)), the third color calibration matrix shown in Table 3 is called:

[0076]

[0077] For the picture with RGB gray scales of (142, 117, 120), the color coordinates in the DCI-P3 color space can be adjusted from (0.346, 0.320) to (0.337, 0.319), so that the color coordinates in the DCI-P3 color space are close to the color coordinates in the sRGB color space, solving the problem of color difference of the portrait color display when switching different color gamuts when taking a picture, and improving the use experience.

[0078] The above examples are only one implementation of display picture color offset of different DCI-P3 color space tables. The matrix of Table 3 can be extended and updated according to the color coordinate difference of different display modes to solve the display color difference problem of different display application scenarios.

[0079] As shown in Figure 5 In the case where the RGB gray scales are (142, 117, 120), the color coordinates (P1) in the DCI-P3 color space and the color coordinates (P2) in the sRGB color space have obvious differences. The color space of the DCI-P3 color space is richer than that of the sRGB color space. Therefore, by adjusting the color point in the DCI-P3 color space to match the color point in the sRGB color space, the color difference caused by switching different color gamuts in the picture taking application scenario can be solved.

[0080] Specifically, as shown in Figure 6As shown, the adjustment direction of the color point in the DCI-P3 color space is to move the color point in the DCI-P3 color space to the left to be close to the color point in the sRGB color space, and the brightness adjustment scheme corresponding to the RGB of the synthetic white picture is to reduce the gray scale voltage of the red pixel or to increase the gray scale voltage of the green pixel and the blue pixel.

[0081] In one of the embodiments, the embodiment provides a liquid crystal display which executes the color difference adjustment method described above.

[0082] It can be understood that, since the liquid crystal display provided by the embodiment executes the color difference adjustment method described above, the first color calibration matrix is called in the display mode by the sRGB color space, the second color calibration matrix is called in the display mode by the DCI-P3 color space, the third color calibration matrix is called in other modes by the DCI-P3 color space according to the color coordinate difference, which can make the colors shown in the other modes by the DCI-P3 color space closer to the colors shown in the display mode by the sRGB color space, thereby reducing the color difference between the DCI-P3 color space and the sRGB color space in different modes, and further improving the problem of display color difference between different color gamuts.

[0083] It needs to be noted that, in order for the liquid crystal display to execute the color difference adjustment method described above, as shown in Figure 7 The liquid crystal display can include an acquisition module 100, a data module 200, and a calling module 3300. The calling module 3300 is connected with the acquisition module 100 and the data module 200. The acquisition module 100 is configured to determine the color coordinate difference between the color coordinates displayed in the sRGB color space and the color coordinates displayed in the DCI-P3 color space. The data module 200 is configured to establish a color calibration matrix library, which includes a first color calibration matrix, a second color calibration matrix, and a third color calibration matrix. The calling module 3300 is configured to call the first color calibration matrix in the display mode by the sRGB color space, call the second color calibration matrix in the display mode by the DCI-P3 color space, and call the third color calibration matrix in other modes by the DCI-P3 color space according to the color coordinate difference.

[0084] Specifically, as shown in Figure 8 The calling module 3300 can include a first calling unit 310, a second calling unit 320, and a third calling unit 320. The first calling unit 310 is configured to call the first color calibration matrix in the display mode by the sRGB color space. The second calling unit 320 is configured to call the second color calibration matrix in the display mode by the DCI-P3 color space. The third calling unit 320 is configured to call the third color calibration matrix in other modes by the DCI-P3 color space according to the color coordinate difference.

[0085] It should be noted that the third calling unit 320 is specifically configured to call the third color calibration matrix in the photographing mode according to the color coordinate difference configuration DCI-P3 color space.

[0086] In one of the embodiments, the data module 200 includes a first obtaining unit and a first determining unit. The first obtaining unit is configured to obtain a target color coordinate of a white picture in a photographing mode in a DCI-P3 color space and a standard color point of the DCI-P3 color space. The first determining unit is configured to determine the third color calibration matrix based on the target color coordinate and the standard color point.

[0087] In one of the embodiments, the first determining unit includes a conversion subunit and a first determining subunit. The conversion subunit is configured to convert the target color coordinate into corresponding tristimulus value coordinates, and Y in the tristimulus value under the white picture is 1. The first determining subunit is configured to determine the third color calibration matrix based on the tristimulus value coordinates and the standard color point.

[0088] In one of the embodiments, the first determining subunit includes a first converter, a first determinator and a second determinator. The first converter is configured to convert the color coordinate of the standard color point into a corresponding color coordinate matrix. The first determinator is configured to determine an intermediate matrix based on the tristimulus value coordinates and the color coordinate matrix. The second determinator is configured to determine the third color calibration matrix according to the color coordinate matrix and the intermediate matrix.

[0089] In one of the embodiments, the first determinator includes a first calculation circuit and a second calculation circuit. The first calculation circuit is configured to obtain an inverse matrix of the color coordinate matrix according to the color coordinate matrix. The second calculation circuit is configured to obtain the intermediate matrix according to the product of the inverse matrix of the color coordinate matrix and the tristimulus value coordinates.

[0090] In one of the embodiments, the second determinator includes a second converter and a third calculation circuit. The second converter is configured to convert the intermediate matrix into a corresponding multi-dimensional matrix. The third calculation circuit is configured to obtain the third color calibration matrix according to the product of the color coordinate matrix and the multi-dimensional matrix.

[0091] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0092] The color difference adjustment method and the liquid crystal display provided by the embodiments of the present application are described in detail above, and the principles and implementation manners of the present application are described by using specific examples. The above description of the embodiments is only used to help understand the technical solutions of the present application and the core ideas thereof. It should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features thereof can be replaced equivalently, and the modification or replacement does not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A color difference adjustment method characterized by comprising: The color difference adjustment method is applied to a display screen, which has an sRGB color space and a DCI-P3 color space, and also has display modes and other modes. The color difference adjustment method includes: Determine the color coordinate difference between the color coordinates displayed in the sRGB color space and the color coordinates displayed in the DCI-P3 color space; A color calibration matrix library is established, which includes a first color calibration matrix, a second color calibration matrix, and a third color calibration matrix. The sRGB color space calls the first color calibration matrix in the display mode, and the DCI-P3 color space calls the second color calibration matrix in the display mode. Based on the color coordinate differences, the DCI-P3 color space is configured to invoke the third color calibration matrix in the other modes.

2. The color difference adjustment method according to claim 1, characterized by, The other modes include a photo mode, wherein configuring the DCI-P3 color space according to the color coordinate difference and calling the third color calibration matrix in the other modes includes: Based on the color coordinate differences, the DCI-P3 color space is configured to call the third color calibration matrix in the shooting mode.

3. The color difference adjustment method according to claim 2, characterized by, The establishment of the color calibration matrix library includes: Obtain the target color coordinates of the DCI-P3 color space in the white screen of the shooting mode, and the standard color point of the DCI-P3 color space; The third color calibration matrix is ​​determined based on the target color coordinates and the standard color points.

4. The color difference adjustment method according to claim 3, characterized by, The step of determining the third color calibration matrix based on the target color coordinates and the standard color point includes: The target color coordinates are converted into the corresponding tristimulus value coordinates, and the Y value in the tristimulus value under the white screen is 1; The third color calibration matrix is ​​determined based on the tristimulus coordinates and the standard color point.

5. The color difference adjustment method according to claim 4, characterized in that, The determination of the third color calibration matrix based on the tristimulus coordinates and the standard color point includes: Convert the color coordinates of the standard color points into the corresponding color coordinate matrix; The intermediate matrix is ​​determined based on the tristimulus coordinates and the chromaticity matrix. The third color calibration matrix is ​​determined based on the color coordinate matrix and the intermediate matrix.

6. The color difference adjustment method according to claim 5, characterized in that, The determination of the intermediate matrix based on the tristimulus coordinates and the chromaticity coordinate matrix includes: The inverse matrix of the color coordinate matrix is ​​obtained from the color coordinate matrix. The intermediate matrix is ​​obtained by multiplying the inverse of the color coordinate matrix with the coordinates of the tristimulus values.

7. The color difference adjustment method according to claim 6, characterized in that, Determining the third color calibration matrix based on the color coordinate matrix and the intermediate matrix includes: Transform the intermediate matrix into the corresponding multidimensional matrix; The third color calibration matrix is ​​obtained by multiplying the color coordinate matrix and the multidimensional matrix.

8. The color difference adjustment method according to any one of claims 1-7, characterized in that, The color gamut of the DCI-P3 color space is wider than that of the sRGB color space.

9. The color difference adjustment method according to claim 8, characterized in that, The display screen also features the Adobe color space, and the color difference adjustment method further includes: Choose the sRGB color space, the DCI-P3 color space, or the Adobe color space for display based on the application scenario.

10. A liquid crystal display screen, characterized in that, The liquid crystal display screen performs the color difference adjustment method as described in any one of claims 1-9.

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