Method and device for generating brightness compensation parameters

Abstract

The present invention provides a method and device for generating brightness compensation parameters, wherein the method comprises the steps of: obtaining a first compensation parameter of a display panel at a first frequency; obtaining a second compensation parameter of the display panel at a second frequency; and generating a third compensation parameter corresponding to an intermediate frequency between the first frequency and the second frequency according to the first compensation parameter and the second compensation parameter. In the present invention, by obtaining the compensation parameters of the display panel at two different frequencies, and based on the obtained first compensation parameter and the second compensation parameter, a plurality of compensation parameters corresponding to a plurality of intermediate frequencies between the two frequencies are obtained by calculation, so as to meet the brightness compensation requirements for display panels with different refresh rates.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a method and device for generating brightness compensation parameters. Background Art

[0002] In the prior art, when demura compensation is performed on display panels with different refresh rates, demura compensation is usually performed at a main frequency of the display panels with different refresh rates. Therefore, the demura compensation effect of the display screen at the main frequency is better. However, the demura compensation effect of the display screen at other frequencies is poor. For example, some manufacturers currently choose to perform demura compensation at a middle frequency. For display panels with low refresh rates, the compensation effect of this solution is acceptable. However, for display panels with high refresh rates, such as display panels with refresh rates of 240Hz, 360Hz or 480Hz, after demura compensation is performed, the image quality requirements cannot be met, resulting in poor display effect of the compensated display screen. Summary of the invention

[0003] The embodiments of the present invention provide a method and device for generating brightness compensation parameters, so as to improve the problem that when performing demura compensation on display panels with different refresh rates, it is difficult to meet the image quality requirements under different refresh rates.

[0004] The present invention provides a method for generating brightness compensation parameters, comprising the steps of:

[0005] Acquire a first compensation parameter of the display panel at a first frequency;

[0006] Acquire a second compensation parameter of the display panel at a second frequency;

[0007] A third compensation parameter corresponding to an intermediate frequency between the first frequency and the second frequency is generated according to the first compensation parameter and the second compensation parameter.

[0008] In some embodiments of the present invention, the step of obtaining a first compensation parameter of the display panel at a first frequency includes:

[0009] According to a plurality of low-grayscale first compensation parameters corresponding to a plurality of low-grayscale images of the display panel at the first frequency, a plurality of high-grayscale first compensation parameters corresponding to a plurality of high-grayscale images of the display panel at the first frequency are generated, wherein the first compensation parameters include the low-grayscale first compensation parameters and the high-grayscale first compensation parameters.

[0010] In some embodiments of the present invention, before the step of generating a plurality of high grayscale first compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the first frequency according to a plurality of low grayscale first compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the first frequency, the step further includes:

[0011] collecting the plurality of low grayscale images of the display panel at the first frequency;

[0012] The plurality of low grayscale images are compensated to obtain the plurality of low grayscale first compensation parameters corresponding to the plurality of low grayscale images.

[0013] In some embodiments of the present invention, the step of generating a plurality of high grayscale first compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the first frequency according to a plurality of low grayscale first compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the first frequency includes:

[0014] According to the collected brightness of the low grayscale picture and the relationship between the brightness of the low grayscale picture and the brightness of the high grayscale picture, fitting to obtain a plurality of fitting brightnesses of a plurality of the high grayscale pictures;

[0015] Compensating the plurality of high grayscale pictures under the plurality of fitting brightnesses to obtain a plurality of high grayscale first compensation parameters corresponding to the plurality of high grayscale pictures.

[0016] In some embodiments of the present invention, the step of obtaining a second compensation parameter of the display panel at a second frequency includes:

[0017] According to a plurality of low-grayscale second compensation parameters corresponding to a plurality of low-grayscale images of the display panel at the second frequency, a plurality of high-grayscale second compensation parameters corresponding to a plurality of high-grayscale images of the display panel at the second frequency are generated, wherein the second compensation parameters include the low-grayscale second compensation and the high-grayscale second compensation parameters.

[0018] In some embodiments of the present invention, before the step of generating a plurality of high grayscale second compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the second frequency according to a plurality of low grayscale second compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the second frequency, the step further includes:

[0019] collecting the plurality of low grayscale images of the display panel at the second frequency;

[0020] The plurality of low grayscale images are compensated to obtain the plurality of low grayscale second compensation parameters corresponding to the plurality of low grayscale images.

[0021] In some embodiments of the present invention, the step of generating a plurality of high grayscale second compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the second frequency according to a plurality of low grayscale second compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the second frequency comprises:

[0022] According to the collected brightness of the low grayscale picture and the relationship between the brightness of the low grayscale picture and the brightness of the high grayscale picture, fitting to obtain a plurality of fitting brightnesses of a plurality of the high grayscale pictures;

[0023] Compensating the plurality of high grayscale pictures at the plurality of fitting brightnesses to obtain a plurality of high grayscale second compensation parameters corresponding to the plurality of high grayscale pictures.

[0024] In some embodiments of the present invention, the second frequency is greater than the first frequency, wherein the first frequency is the minimum frequency of the display panel and the second frequency is the maximum frequency of the display panel.

[0025] In some embodiments of the present invention, the third compensation parameter is generated by interpolation according to the first compensation parameter and the second compensation parameter.

[0026] The present invention also provides a device for generating brightness compensation parameters, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the steps in the aforementioned method for generating brightness compensation parameters when executed by the processor.

[0027] In the method for generating brightness compensation parameters provided in an embodiment of the present invention, compensation parameters of a display panel at two different frequencies are obtained, and based on the obtained first compensation parameter and second compensation parameter, multiple compensation parameters corresponding to multiple intermediate frequencies between the two frequencies are obtained by calculation. Since different frequencies correspond to different compensation parameters, corresponding compensation parameters can be used to perform brightness compensation according to the refresh rate of the display panel, thereby realizing brightness compensation for display panels with different refresh rates. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0029] Figure 1 It is a flowchart of a method for generating brightness compensation parameters provided by an embodiment of the present invention.

[0030] Figure 2 It is a schematic diagram of a curve showing the relationship between brightness compensation parameters and frequency provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention. In the present invention, unless otherwise specified, the directional words used, such as "upper" and "lower", generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the drawings; while "inside" and "outside" refer to the outline of the device.

[0032] like Figure 1 As shown, this embodiment provides a method for generating brightness compensation parameters, comprising the steps of:

[0033] S10, obtaining a first compensation parameter of the display panel at a first frequency;

[0034] S20, obtaining a second compensation parameter of the display panel at a second frequency;

[0035] S30: Generate a third compensation parameter corresponding to an intermediate frequency between the first frequency and the second frequency according to the first compensation parameter and the second compensation parameter.

[0036] In the prior art, when demura compensation is performed on a display screen of a display panel, a brightness compensation parameter obtained at a fixed intermediate frequency is usually used to perform demura compensation on display panels with different refresh rates. However, under different refresh rates, the performance of mura (defects) on the display screen of the display panel is inconsistent. For example, the defects displayed on the display screen under the conditions of 60 Hz and 240 Hz are different. Therefore, when brightness compensation parameters obtained at a fixed intermediate frequency are used to perform brightness compensation on a display panel with a refresh rate less than the intermediate frequency or a display panel with a refresh rate greater than the intermediate frequency, the result is not ideal, especially when brightness compensation is performed on a display panel with a refresh rate greater than the intermediate frequency, the compensation effect is worse.

[0037] Based on the problems existing in the prior art, the present embodiment provides a method for generating brightness compensation parameters. First, compensation parameters of the display panel at two different frequencies, namely the aforementioned first compensation parameter and second compensation parameter, are obtained. Secondly, based on the obtained first compensation parameter and second compensation parameter, multiple compensation parameters corresponding to multiple intermediate frequencies between the two frequencies can be obtained by calculation. Since different frequencies correspond to different compensation parameters, corresponding compensation parameters can be used to perform brightness compensation according to the refresh rate of the display panel, thereby improving the effect of brightness compensation for display panels with different refresh rates.

[0038] At the same time, compared with the existing demura compensation for different frequencies, it is necessary to capture multiple display images of display panels at different frequencies, and then, demura compensation needs to be performed on multiple display images at the same frequency, so as to obtain multiple demura compensation parameters at different frequencies. Since multiple display images need to be captured for each display panel at each frequency, and corresponding demura compensation needs to be performed on multiple display images, it is obviously time-consuming. In this embodiment, after obtaining the first compensation parameter at the first frequency and the second compensation parameter at the second frequency, the compensation parameters corresponding to multiple intermediate frequencies between the first frequency and the second frequency can be derived through the relationship between the compensation parameter and the frequency, which can save the time of capturing the display images of the display panel, thereby effectively improving the efficiency of brightness compensation for display panels with different refresh rates. It can be understood that in this embodiment, a set of low-frequency demura compensation tables are pre-built in the memory of the display panel, such as the timing controller (Tcon). Since the existing demura compensation is for demura compensation at a fixed frequency, it is necessary to add demura compensation tables at different frequencies in this embodiment.

[0039] Specifically, in this embodiment, step S10, obtaining a first compensation parameter of the display panel at a first frequency, includes:

[0040] According to a plurality of low-grayscale first compensation parameters corresponding to a plurality of low-grayscale images of the display panel at a first frequency, a plurality of high-grayscale first compensation parameters corresponding to a plurality of high-grayscale images of the display panel at the first frequency are generated, and the first compensation parameters include a low-grayscale first compensation parameter and a high-grayscale first compensation parameter.

[0041] In this embodiment, the acquisition of the first compensation parameter is carried out in two steps. First, a plurality of low-grayscale first compensation parameters corresponding to the low-grayscale image are acquired. Then, based on the acquired plurality of low-grayscale first compensation parameters, a plurality of high-grayscale first compensation parameters are acquired by calculation. This saves the time for capturing the high-grayscale image and demura compensation, and further improves the efficiency of brightness compensation for display panels with different frequencies.

[0042] Wherein, before the step of generating a plurality of high grayscale first compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the first frequency according to a plurality of low grayscale first compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the first frequency, the step further includes:

[0043] Capturing a plurality of low grayscale images of the display panel at a first frequency;

[0044] Compensating a plurality of low grayscale images, and obtaining a plurality of low grayscale first compensation parameters corresponding to the plurality of low grayscale images.

[0045] Specifically, the step of generating a plurality of high grayscale first compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the first frequency according to a plurality of low grayscale first compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the first frequency includes:

[0046] According to the collected brightness of the low grayscale picture and the relationship between the brightness of the low grayscale picture and the brightness of the high grayscale picture, a plurality of fitting brightnesses of a plurality of high grayscale pictures are obtained by fitting;

[0047] Compensating the plurality of high grayscale pictures under the plurality of fitting brightnesses to obtain a plurality of high grayscale first compensation parameters corresponding to the plurality of high grayscale pictures.

[0048] Conventional demura brightness compensation will collect data at, for example, 24 grayscales, 64 grayscales, 128 grayscales, 192 grayscales, or 255 grayscales. Because mura is easier to identify at low grayscales than at high grayscales, usually more display images are collected at low grayscales, while fewer display images are collected at high grayscales.

[0049] In the present embodiment, a plurality of high grayscale images are fitted based on low grayscale images collected at a plurality of low grayscales, wherein after a plurality of low grayscale images are collected at a first frequency, a plurality of corresponding low grayscale first compensation parameters can be obtained by demura compensation of the plurality of low grayscale images, and then a plurality of high grayscale images are fitted according to the image uniformity trend, that is, the fitted brightness of the plurality of high grayscale images is fitted according to the brightness of the collected low grayscale images and the relationship between the brightness of the low grayscale images and the brightness of the high grayscale images, and the fitted brightness can be regarded as the uncompensated current brightness at a high grayscale, and a plurality of high grayscale first compensation parameters can be obtained by compensating for the fitted brightness of the plurality of high grayscale images, and since the step of collecting the high grayscale images is omitted, the time for capturing the high grayscale images and demura compensation is saved.

[0050] Further, in this embodiment, step S20, the step of obtaining a second compensation parameter of the display panel at a second frequency, includes:

[0051] According to a plurality of low grayscale second compensation parameters corresponding to a plurality of low grayscale images of the display panel at a second frequency, a plurality of high grayscale second compensation parameters corresponding to a plurality of high grayscale images of the display panel at a second frequency are generated, and the second compensation parameters include low grayscale second compensation and high grayscale second compensation parameters.

[0052] Among them, after obtaining the first compensation parameter of the display panel at the first frequency, it is necessary to continue to obtain the second compensation parameter of the display panel at the second frequency, and the second compensation parameter includes a low-grayscale second compensation parameter and a high-grayscale second compensation parameter. First, a plurality of low-grayscale second compensation parameters corresponding to a plurality of low-grayscale images at the second frequency are obtained, and then, based on the obtained plurality of low-grayscale second compensation parameters, a plurality of high-grayscale second compensation parameters corresponding to a plurality of high-grayscale images at the second frequency can be obtained by calculation, thereby saving the time for capturing the high-grayscale images and demura compensation.

[0053] Wherein, before the step of generating a plurality of high grayscale second compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the second frequency according to a plurality of low grayscale second compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the second frequency, the step further includes:

[0054] Capturing a plurality of low grayscale images of the display panel at a second frequency;

[0055] Compensate the multiple low grayscale images, and obtain multiple low grayscale second compensation parameters corresponding to the multiple low grayscale images.

[0056] Specifically, the step of generating a plurality of high grayscale second compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the second frequency according to a plurality of low grayscale second compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the second frequency includes:

[0057] According to the collected brightness of the low grayscale picture and the relationship between the brightness of the low grayscale picture and the brightness of the high grayscale picture, a plurality of fitting brightnesses of a plurality of high grayscale pictures are obtained by fitting;

[0058] Compensating the plurality of high grayscale pictures at the plurality of fitting brightnesses to obtain a plurality of high grayscale second compensation parameters corresponding to the plurality of high grayscale pictures.

[0059] Among them, a plurality of high grayscale pictures are fitted based on low grayscale pictures collected at a plurality of low grayscales, wherein after a plurality of low grayscale pictures at a second frequency are collected, a plurality of corresponding low grayscale second compensation parameters can be obtained by demura compensation of the plurality of low grayscale pictures, and then a plurality of high grayscale pictures are fitted according to the picture uniformity trend, that is, according to the brightness of the collected low grayscale pictures and the relationship between the brightness of the low grayscale pictures and the brightness of the high grayscale pictures, the fitted brightness of the plurality of high grayscale pictures is fitted, and the fitted brightness can be regarded as the uncompensated current brightness at a high grayscale, and a plurality of high grayscale second compensation parameters can be obtained by compensating the fitted brightness of the plurality of high grayscale pictures, and since the step of collecting the high grayscale pictures is omitted, the time for capturing the high grayscale pictures and demura compensation is saved.

[0060] In this embodiment, optionally, the second frequency is greater than the first frequency, wherein the first frequency is the minimum frequency of the display panel and the second frequency is the maximum frequency of the display panel.

[0061] In this embodiment, the first frequency and the second frequency are two different frequencies. When the second frequency is greater than the first frequency, the first frequency is the minimum frequency of the display panel, and the second frequency is the maximum frequency of the display panel, there are multiple intermediate frequencies between the first frequency and the second frequency. Through the first compensation parameter corresponding to the first frequency and the second compensation parameter corresponding to the second frequency, multiple third compensation parameters corresponding to the multiple intermediate frequencies can be calculated. Among them, the greater the difference between the first frequency and the second frequency, the more intermediate frequencies and their corresponding third compensation parameters can be obtained.

[0062] By obtaining compensation parameters of the display panel at two different frequencies, and based on the obtained first compensation parameter and the second compensation parameter, multiple compensation parameters corresponding to multiple intermediate frequencies between the two frequencies can be calculated. Different frequencies correspond to different compensation parameters, and corresponding compensation parameters can be used to perform brightness compensation according to the refresh rate of the display panel, thereby realizing brightness compensation for display panels with different refresh rates.

[0063] Optionally, in this embodiment, the third compensation parameter is generated by interpolation based on the first compensation parameter and the second compensation parameter.

[0064] In this embodiment, the method of obtaining the third compensation parameter corresponding to the intermediate frequency between the first frequency and the second frequency by interpolation is simple and easy to execute. Figure 2 , Figure 2 A curve showing the relationship between the brightness compensation parameter and the frequency at the center point of 64 grayscales is shown, wherein the horizontal axis is the frequency and the vertical axis is the brightness compensation parameter. It can be clearly seen that the brightness compensation parameters near the low frequency and high frequency are close to the parameters of the acquisition frequency.

[0065] The present invention also provides a device for generating brightness compensation parameters, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the steps in the method for generating brightness compensation parameters when executed by the processor.

[0066] Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for generating brightness compensation parameters, characterized in that: Includes steps: Acquiring a first compensation parameter of the display panel at a first frequency; specifically comprising: generating a plurality of high-grayscale first compensation parameters corresponding to a plurality of high-grayscale pictures of the display panel at the first frequency according to a plurality of low-grayscale first compensation parameters corresponding to a plurality of low-grayscale pictures of the display panel at the first frequency, wherein the first compensation parameter includes the low-grayscale first compensation parameter and the high-grayscale first compensation parameter; Acquiring a second compensation parameter of the display panel at a second frequency; specifically comprising: generating a plurality of high-grayscale second compensation parameters corresponding to a plurality of high-grayscale pictures of the display panel at the second frequency according to a plurality of low-grayscale second compensation parameters corresponding to a plurality of low-grayscale pictures of the display panel at the second frequency, wherein the second compensation parameters include the low-grayscale second compensation and the high-grayscale second compensation parameters; the second frequency is greater than the first frequency, wherein the first frequency is the minimum frequency of the display panel, and the second frequency is the maximum frequency of the display panel; A third compensation parameter corresponding to an intermediate frequency between the first frequency and the second frequency is generated according to the first compensation parameter and the second compensation parameter.

2. The method for generating brightness compensation parameters according to claim 1, characterized in that: Before the step of generating a plurality of high grayscale first compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the first frequency according to a plurality of low grayscale first compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the first frequency, the method further includes: collecting the plurality of low grayscale images of the display panel at the first frequency; The plurality of low grayscale images are compensated to obtain the plurality of low grayscale first compensation parameters corresponding to the plurality of low grayscale images.

3. The method for generating brightness compensation parameters according to claim 2, characterized in that: The step of generating a plurality of high grayscale first compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the first frequency according to a plurality of low grayscale first compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the first frequency comprises: According to the collected brightness of the low grayscale picture and the relationship between the brightness of the low grayscale picture and the brightness of the high grayscale picture, fitting to obtain a plurality of fitting brightnesses of a plurality of the high grayscale pictures; Compensating the plurality of high grayscale pictures under the plurality of fitting brightnesses to obtain a plurality of high grayscale first compensation parameters corresponding to the plurality of high grayscale pictures.

4. The method for generating brightness compensation parameters according to claim 1, characterized in that: Before the step of generating a plurality of high grayscale second compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the second frequency according to a plurality of low grayscale second compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the second frequency, the step further includes: collecting the plurality of low grayscale images of the display panel at the second frequency; The plurality of low grayscale images are compensated to obtain the plurality of low grayscale second compensation parameters corresponding to the plurality of low grayscale images.

5. The method for generating brightness compensation parameters according to claim 4, characterized in that: The step of generating a plurality of high grayscale second compensation parameters corresponding to a plurality of high grayscale pictures of the display panel at the second frequency according to a plurality of low grayscale second compensation parameters corresponding to a plurality of low grayscale pictures of the display panel at the second frequency comprises: According to the collected brightness of the low grayscale picture and the relationship between the brightness of the low grayscale picture and the brightness of the high grayscale picture, fitting to obtain a plurality of fitting brightnesses of a plurality of the high grayscale pictures; Compensating the plurality of high grayscale pictures at the plurality of fitting brightnesses to obtain a plurality of high grayscale second compensation parameters corresponding to the plurality of high grayscale pictures.

6. The method for generating brightness compensation parameters according to claim 1, characterized in that: The third compensation parameter is generated by interpolation based on the first compensation parameter and the second compensation parameter.

7. A device for generating brightness compensation parameters, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the computer program is executed by the processor, the steps in the method for generating brightness compensation parameters according to any one of claims 1 to 6 are implemented.

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