Color shift adjustment method and tiled display screen

Abstract

The application discloses a color deviation adjusting method and a spliced display screen. The color deviation adjusting method determines initial gamma voltages of color sub-pixels under a gray scale, obtains corresponding brightness differences and chroma differences according to differences between real-time values of bright chroma under the gray scale and reference values of the bright chroma, and determines target gamma voltages corresponding to the initial gamma voltages of the corresponding color sub-pixels based on matching results of the brightness differences and the chroma differences with corresponding threshold brightness and chroma specifications, so that the brightness differences and the chroma differences meet the threshold brightness and the chroma specifications, and in turn, the inconsistency between display chroma of a direct display module and display chroma of a liquid crystal display panel is reduced.

Description

Technical Field

[0001] This application relates to the field of display technology, specifically to a color deviation adjustment method and a splicing display screen. Background Technology

[0002] In the field of display technology, video wall displays are prone to color shift at low grayscale levels, which degrades display quality. Therefore, improving color shift at corresponding grayscale levels has become an important research direction. Summary of the Invention

[0003] This application provides a color deviation adjustment method and a splicing display screen to alleviate the technical problem of inconsistency between the display color of the direct display module and the display color of the liquid crystal display panel.

[0004] In a first aspect, this application provides a color shift adjustment method, which includes: determining the initial gamma voltage of each color sub-pixel under a grayscale; obtaining the corresponding luminance difference and chrominance difference based on the difference between the real-time luminance and chrominance values ​​and the luminance and chrominance reference values ​​under the grayscale; and determining the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel based on the matching results of the luminance difference and chrominance difference with the corresponding threshold luminance and chrominance specifications.

[0005] Obtain the initial gamma voltage and brightness of each color sub-pixel at the maximum gray level, as well as the target brightness of each color sub-pixel at the gray level; The initial gamma voltage of each color sub-pixel at the maximum gray level is calculated based on the initial gamma voltage and brightness of each color sub-pixel at the gray level, and the target brightness of each color sub-pixel at the gray level.

[0006] In some embodiments, the corresponding luminance difference and chromaticity difference are obtained based on the difference between the real-time luminance and chromaticity values ​​at the grayscale and the luminance and chromaticity reference values. This includes: configuring the real-time luminance and chromaticity values ​​to include a real-time luminance value, a real-time chromaticity horizontal axis value, and a real-time chromaticity vertical axis value; and the luminance and chromaticity reference values ​​to include a luminance reference value, a chromaticity horizontal axis reference value, and a chromaticity vertical axis reference value; obtaining the luminance difference based on the difference between the real-time luminance value and the luminance reference value, obtaining the chromaticity horizontal axis difference based on the difference between the real-time chromaticity value and the luminance reference value, and obtaining the chromaticity vertical axis difference based on the difference between the real-time chromaticity value and the chromaticity vertical axis reference value, wherein the chromaticity horizontal axis difference and the chromaticity vertical axis difference are chromaticity differences.

[0007] In some implementations, the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel is determined based on the matching results of the luminance difference and chrominance difference with the corresponding threshold luminance and chrominance specifications, respectively. This includes: selecting the initial gamma voltage of the color sub-pixel to be adjusted based on the matching results of the chrominance abscissa difference, chrominance ordinate difference and chrominance specifications; obtaining the corresponding gamma adjustment voltage based on one of the chrominance abscissa difference, chrominance ordinate difference, or luminance difference; and superimposing the gamma adjustment voltage on the initial gamma voltage to obtain the target gamma voltage.

[0008] In some embodiments, the color sub-pixel to be adjusted is selected based on the matching result of the chromaticity abscissa difference, the chromaticity ordinate difference, and the chromaticity specification. This includes: if the matching result is that the chromaticity abscissa difference is greater than the chromaticity ordinate difference and the chromaticity ordinate difference is greater than the chromaticity specification, then the initial gamma voltage of the color sub-pixel to be adjusted is the initial gamma voltage of the red sub-pixel; or, if the matching result is that the chromaticity abscissa difference is less than the chromaticity ordinate difference and the chromaticity abscissa difference is greater than the chromaticity specification, then the initial gamma voltage of the color sub-pixel to be adjusted is the initial gamma voltage of the green sub-pixel; or, if the matching result is that both the chromaticity abscissa difference and the chromaticity ordinate difference are less than the chromaticity specification, then the initial gamma voltage of the color sub-pixel to be adjusted is the initial gamma voltage of the blue sub-pixel.

[0009] In some implementations, the corresponding gamma adjustment voltage is obtained based on one of the chromaticity abscissa difference, chromaticity ordinate difference, or luminance difference, including: if the initial gamma voltage of the color sub-pixel to be adjusted is the initial gamma voltage of the red sub-pixel, then a gamma adjustment voltage opposite to the sign of the chromaticity abscissa difference is obtained; or, if the initial gamma voltage of the color sub-pixel to be adjusted is the initial gamma voltage of the green sub-pixel, then a gamma adjustment voltage opposite to the sign of the chromaticity ordinate difference is obtained; or, if the initial gamma voltage of the color sub-pixel to be adjusted is the initial gamma voltage of the blue sub-pixel, then a gamma adjustment voltage with the same sign as the luminance difference is obtained.

[0010] In some implementations, after determining the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel based on the matching results of the brightness difference and chromaticity difference with the corresponding threshold brightness and chromaticity specifications, the method further includes: determining the initial gamma voltage of each color sub-pixel in other gray levels as the corresponding target gamma voltage.

[0011] In some implementations, the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel is determined based on the matching results of the luminance difference and chrominance difference with the corresponding threshold luminance and chrominance specifications, respectively. The method further includes: determining the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel when the luminance difference is less than the threshold luminance and the chrominance difference is less than the chrominance specification.

[0012] Secondly, this application provides a splicing display screen, which includes a liquid crystal display panel and a direct display module spliced ​​together, wherein the direct display module performs the color shift adjustment method in at least one of the above embodiments.

[0013] In some embodiments, the two liquid crystal display panels are connected by a single display module.

[0014] The color shift adjustment method and splicing display screen provided in this application determine the initial gamma voltage of each color sub-pixel under a grayscale, and obtain the corresponding brightness difference and chromaticity difference based on the difference between the real-time value of brightness and chromaticity under the grayscale and the reference value of brightness and chromaticity. Based on the matching results of the brightness difference and chromaticity difference with the corresponding threshold brightness and chromaticity specifications, the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel can be determined, thereby making the brightness difference and chromaticity difference conform to the threshold brightness and chromaticity specifications, and thus reducing the inconsistency between the display chromaticity of the direct display module and the display chromaticity of the liquid crystal display panel. Attached Figure Description

[0015] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0016] Figure 1 This is a schematic flowchart of a color shift adjustment method provided in an embodiment of this application.

[0017] Figure 2 This is another schematic flowchart of the color shift adjustment method provided in the embodiments of this application. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Features thus defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more unless otherwise explicitly specified.

[0020] This embodiment provides a method for adjusting color cast. Please refer to [link / reference]. Figure 1 , Figure 2 The color cast adjustment method includes the following steps: Step S10: Determine the initial gamma voltage of each color sub-pixel under a grayscale.

[0021] Step S20: Obtain the corresponding luminance difference and chromaticity difference based on the difference between the real-time luminance and chromaticity values ​​in grayscale and the luminance and chromaticity reference values.

[0022] Step S30: Based on the matching results of the brightness difference and chromaticity difference with the corresponding threshold brightness and chromaticity specifications, determine the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel.

[0023] It is understood that the color shift adjustment method provided in this embodiment determines the initial gamma voltage of each color sub-pixel under a grayscale, and obtains the corresponding brightness difference and chromaticity difference based on the difference between the real-time value of brightness and chromaticity under the grayscale and the reference value of brightness and chromaticity. Based on the matching results of the brightness difference and chromaticity difference with the corresponding threshold brightness and chromaticity specifications, the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel can be determined, thereby making the brightness difference and chromaticity difference conform to the threshold brightness and chromaticity specifications, and thus reducing the inconsistency between the display chromaticity of the direct display module and the display chromaticity of the liquid crystal display panel.

[0024] It should be noted that steps S10 and S20 can be performed in any order. For example, step S10 can precede step S20, or step S10 can follow step S20.

[0025] Step S10 can be: Figure 2 The initial value is obtained as follows: Obtain the initial gamma voltage and brightness of each color sub-pixel at the maximum gray level, as well as the target brightness of each color sub-pixel at the same gray level. Then, based on the initial gamma voltage and brightness of each color sub-pixel at the maximum gray level, and the target brightness of each color sub-pixel at the same gray level, calculate the initial gamma voltage of each color sub-pixel at the corresponding gray level.

[0026] In some embodiments of this application, an example is given with a maximum gray level of 255. The brightness at gray level 255, the initial gamma voltage of the red sub-pixel, the initial gamma voltage of the green sub-pixel, and the initial gamma voltage of the blue sub-pixel in the gamma table are respectively expressed in terms of Lv. max R max G max B max Let Lv0 represent the value of a gray level less than 255. Assuming the target brightness is Lv0, the initial gamma voltage (R0) of the red sub-pixel, the initial gamma voltage (G0) of the green sub-pixel, and the initial gamma voltage (B0) of the blue sub-pixel at that gray level can be calculated using the following formula (1-1): (1-1) In some embodiments of this application, the real-time luminance and chromaticity values ​​include the real-time luminance value (Lv). t ) and real-time chromaticity values, the real-time chromaticity values ​​including the real-time chromaticity x-axis value (x t ) and real-time value of chromaticity ordinate (y t The real-time values ​​of luminance and chrominance are obtained in real time. The luminance and chrominance reference values ​​include the luminance reference value (Lv), the chrominance horizontal axis reference value (x), and the chrominance vertical axis reference value (y). The luminance and chrominance reference values ​​can be determined through empirical data or actual display requirements.

[0027] The luminance difference (ΔLv) is the difference between the real-time luminance value and the reference luminance value. The chromaticity abscissa difference (Δx) is the difference between the real-time chromaticity abscissa value and the reference chromaticity abscissa value. The chromaticity ordinate difference (Δy) is the difference between the real-time chromaticity ordinate value and the reference chromaticity ordinate value.

[0028] Threshold brightness is spec%Lv t The color specification is specified by spec. Spec can be less than or equal to 3‰, for example, spec can be 0.5‰, 1‰, 1.5‰, 2.5‰, 3‰, etc.

[0029] Please see Figure 2After determining the initial gamma voltage of each color sub-pixel at a grayscale level, the process continues to determine if Δx and Δy < 1‰ and ΔLv < 1%Lv. If so, the initial gamma voltage of each color sub-pixel at that grayscale level is the target gamma voltage, and the color shift adjustment method ends. If not, the process continues to determine the relationship between Δx, Δy, and 1‰. Specifically, if Δx and Δy < 1‰, the initial gamma voltage of the color sub-pixel to be adjusted is selected as the initial gamma voltage of the blue sub-pixel (selection B), and then a gamma adjustment voltage with the same sign as the brightness difference is obtained. That is, if ΔLv < 0, a negative step voltage (Step) is determined as the gamma adjustment voltage; if ΔLv > 0, a positive step voltage (Step) is determined as the gamma adjustment voltage.

[0030] Therefore, a gamma adjustment voltage, namely B+Step, is superimposed on the initial gamma voltage until the requirements of threshold brightness and chromaticity specifications are met.

[0031] If Δx and Δy do not satisfy 1‰, then select the initial gamma voltage of the color sub-pixel that needs to be adjusted as the initial gamma voltage of the red sub-pixel (select R) or the initial gamma voltage of the green sub-pixel (select G).

[0032] Specifically, if the matching result is that the difference in the chromaticity abscissa is greater than the difference in the chromaticity ordinate and the difference in the chromaticity ordinate is greater than the chromaticity specification (Δx > Δy > spec), then the initial gamma voltage of the color sub-pixel that needs to be adjusted is selected as the initial gamma voltage of the red sub-pixel; or, if the matching result is that the difference in the chromaticity abscissa is less than the difference in the chromaticity ordinate and the difference in the chromaticity abscissa is greater than the chromaticity specification (spec < Δx < Δy), then the initial gamma voltage of the color sub-pixel that needs to be adjusted is selected as the initial gamma voltage of the green sub-pixel.

[0033] If the initial gamma voltage of the color sub-pixel to be adjusted is selected as the initial gamma voltage of the red sub-pixel (select R), then a gamma adjustment voltage with the opposite sign to the difference in chromaticity abscissa is obtained. If Δx > 0, a negative step voltage is determined as the gamma adjustment voltage; or, if Δx < 0, a positive step voltage is determined as the gamma adjustment voltage.

[0034] Therefore, a gamma adjustment voltage, R+Step, is superimposed on the initial gamma voltage until the requirements of threshold brightness and chromaticity specifications are met.

[0035] If the initial gamma voltage of the color sub-pixel to be adjusted is selected as the initial gamma voltage of the green sub-pixel (select G), then a gamma adjustment voltage with the opposite sign to the difference in chromaticity ordinate is obtained. If Δy > 0, a negative step voltage is determined as the gamma adjustment voltage; or, if Δy < 0, a positive step voltage is determined as the gamma adjustment voltage.

[0036] Therefore, a gamma adjustment voltage, namely G+Step, is superimposed on the initial gamma voltage until the requirements of threshold luminance and chromaticity specifications are met.

[0037] In other words, if pre is the gamma voltage before superposition and cur is the gamma voltage after superposition, then cur = pre + Step.

[0038] Then determine whether the change in cur, Δcur, is greater than the change in pre, Δpre, i.e., Δcur > Δpre. If so, reduce Step to half of its original value (Step = Step / 2) and continue executing the step "cur = pre + Step"; otherwise, assign the magnitude of cur to pre, i.e., pre = cur.

[0039] Then determine whether Δx, Δy < 1‰ and ΔLv < 1%Lv. If not, proceed to the judgment step of "Δx, Δy < 1‰"; if yes, end.

[0040] In one embodiment, this embodiment provides a splicing display screen, which includes a liquid crystal display panel and a direct display module spliced ​​together, and the direct display module performs the color shift adjustment method in at least one embodiment above.

[0041] It is understood that, since this embodiment implements the color shift adjustment method in at least one of the above embodiments, it is also possible to determine the initial gamma voltage of each color sub-pixel under a grayscale, obtain the corresponding brightness difference and chromaticity difference based on the difference between the real-time value of brightness and chromaticity under the grayscale and the reference value of brightness and chromaticity, and determine the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel based on the matching results of the brightness difference and chromaticity difference with the corresponding threshold brightness and chromaticity specifications, thereby making the brightness difference and chromaticity difference conform to the threshold brightness and chromaticity specifications, and thus reducing the inconsistency between the display chromaticity of the direct display module and the display chromaticity of the liquid crystal display panel.

[0042] It should be noted that the two LCD panels are connected by a direct display module. The width or area of ​​the direct display module is smaller than the width or area of ​​the LCD panels.

[0043] The light-emitting devices used in the direct-view module can be mini light-emitting diodes, micro light-emitting diodes, organic light-emitting diodes, or quantum dot light-emitting diodes.

[0044] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0045] The color shift adjustment method and splicing display screen provided in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solutions and core ideas of this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for adjusting color cast, characterized in that, The color shift adjustment method includes: Determine the initial gamma voltage of each color sub-pixel under a grayscale level; The corresponding luminance difference and chromaticity difference are obtained based on the difference between the real-time luminance and chromaticity values ​​at the grayscale and the luminance and chromaticity reference values. Based on the matching results of the brightness difference and the chromaticity difference with the corresponding threshold brightness and chromaticity specifications, the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel is determined. The step of obtaining the corresponding luminance difference and chromaticity difference based on the difference between the real-time luminance and chromaticity values ​​at the grayscale and the luminance and chromaticity reference values ​​includes: The real-time values ​​of brightness and chromaticity are configured to include real-time values ​​of brightness, chromaticity horizontal axis, and chromaticity vertical axis. The reference values ​​of brightness and chromaticity include reference values ​​of brightness, chromaticity horizontal axis, and chromaticity vertical axis. The luminance difference is obtained by the difference between the real-time luminance value and the luminance reference value, the chromaticity abscissa difference is obtained by the difference between the real-time chromaticity abscissa value and the chromaticity abscissa reference value, and the chromaticity ordinate difference is obtained by the difference between the real-time chromaticity ordinate value and the chromaticity ordinate reference value. The chromaticity abscissa difference and the chromaticity ordinate difference are the chromaticity difference. The step of determining the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel based on the matching results of the luminance difference and the chrominance difference with the corresponding threshold luminance and chrominance specifications, respectively, includes: Based on the matching results of the chromaticity abscissa difference, the chromaticity ordinate difference, and the chromaticity specification, the initial gamma voltage of the color sub-pixel that needs to be adjusted is selected; The corresponding gamma adjustment voltage is obtained based on one of the chromaticity abscissa difference, the chromaticity ordinate difference, or the luminance difference; The target gamma voltage is obtained by superimposing the gamma adjustment voltage on the initial gamma voltage. The step of selecting the color sub-pixels to be adjusted based on the matching result of the chromaticity abscissa difference, the chromaticity ordinate difference, and the chromaticity specification includes: If the matching result is that the difference in the chromaticity horizontal coordinate is greater than the difference in the chromaticity vertical coordinate and the difference in the chromaticity vertical coordinate is greater than the chromaticity specification, then the initial gamma voltage of the color sub-pixel that needs to be adjusted is selected as the initial gamma voltage of the red sub-pixel. If the matching result is that the difference in the chromaticity horizontal coordinate is less than the difference in the chromaticity vertical coordinate and the difference in the chromaticity horizontal coordinate is greater than the chromaticity specification, then the initial gamma voltage of the color sub-pixel that needs to be adjusted is selected as the initial gamma voltage of the green sub-pixel. If the matching result is that both the difference in the chromaticity horizontal axis and the difference in the chromaticity vertical axis are less than the chromaticity specification, then the initial gamma voltage of the color sub-pixel that needs to be adjusted is selected as the initial gamma voltage of the blue sub-pixel.

2. The color shift adjustment method according to claim 1, characterized in that, Determining the initial gamma voltage of each color sub-pixel at a grayscale level includes: Obtain the initial gamma voltage and brightness of each color sub-pixel at the maximum gray level, as well as the target brightness of each color sub-pixel at the gray level; The initial gamma voltage of each color sub-pixel at the maximum gray level is calculated based on the initial gamma voltage and brightness of each color sub-pixel at the gray level, and the target brightness of each color sub-pixel at the gray level.

3. The color shift adjustment method according to claim 1, characterized in that, The step of obtaining the corresponding gamma adjustment voltage based on one of the chromaticity abscissa difference, the chromaticity ordinate difference, or the luminance difference includes: If the initial gamma voltage of the color sub-pixel to be adjusted is selected as the initial gamma voltage of the red sub-pixel, then a gamma adjustment voltage with the opposite sign to the difference in chromaticity abscissa is obtained; or, If the initial gamma voltage of the color sub-pixel to be adjusted is selected as the initial gamma voltage of the green sub-pixel, then a gamma adjustment voltage with the opposite sign to the difference in chromaticity ordinate is obtained; or, If the initial gamma voltage of the color sub-pixel to be adjusted is selected as the initial gamma voltage of the blue sub-pixel, then the gamma adjustment voltage with the same sign as the brightness difference is obtained.

4. The color shift adjustment method according to any one of claims 1-3, characterized in that, After determining the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel based on the matching results of the luminance difference and the chrominance difference with the corresponding threshold luminance and chrominance specifications, the method further includes: Determine the target gamma voltage corresponding to the initial gamma voltage of each color sub-pixel at each other gray level.

5. The color shift adjustment method according to any one of claims 1-4, characterized in that, The step of determining the target gamma voltage corresponding to the initial gamma voltage of the corresponding color sub-pixel based on the matching results of the luminance difference and the chrominance difference with the corresponding threshold luminance and chrominance specifications, respectively, further includes: When the brightness difference is less than the threshold brightness and the chromaticity difference is less than the chromaticity specification, the initial gamma voltage of the corresponding color sub-pixel is determined as the corresponding target gamma voltage.

6. A splicing display screen, characterized in that, The splicing display screen includes interconnected liquid crystal display panels and direct display modules, wherein the direct display modules perform the color shift adjustment method as described in any one of claims 1-5.

7. The splicing display screen according to claim 6, characterized in that, The two liquid crystal display panels are connected by a direct display module.

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