CN113658538A - Brightness compensation data generation method, brightness compensation device and computer equipment - Google Patents

Brightness compensation data generation method, brightness compensation device and computer equipment Download PDF

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CN113658538A
CN113658538A CN202110962368.6A CN202110962368A CN113658538A CN 113658538 A CN113658538 A CN 113658538A CN 202110962368 A CN202110962368 A CN 202110962368A CN 113658538 A CN113658538 A CN 113658538A
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compensation
brightness
data
parameter
mura
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王岩岩
熊星
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Suzhou HYC Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

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Abstract

The application relates to a method, a device, a computer device and a storage medium for generating brightness compensation data and compensating brightness, which are characterized in that target brightness data, brightness compensation parameters and Mura area data to be compensated are obtained; compensating the data to be compensated in the Mura area by using the brightness compensation parameters to obtain the brightness data in the Mura area; determining compensation adjustment parameters according to the target brightness data and the Mura region brightness data; and generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter, so that the brightness compensation data is supplemented, and the accuracy of the brightness compensation data is improved. When the phenomenon of over-compensation or under-compensation exists, the brightness compensation is carried out through the compensation adjustment parameters, the adjustment process of the compensation parameters is simplified, and the tedious process of carrying out multiple attempts through manual adjustment of the compensation parameters is avoided.

Description

Brightness compensation data generation method, brightness compensation device and computer equipment
Technical Field
The present application relates to the field of display technologies, and in particular, to a method and an apparatus for generating luminance compensation data, a method and an apparatus for luminance compensation, a computer device, and a storage medium.
Background
With the rapid development of video display technology, large-size ultrahigh-resolution and ultra-narrow frame display technology becomes the focus of key competition of panel factories. However, as the size increases, the difficulty of process control of the display panel increases, and Mura is generated due to the poor uniformity of the image caused by the deviation of the process control. Mura refers to the display non-uniformity of the display panel, and DeMura is an algorithm for eliminating the Mura of the display panel by using compensation parameters.
In the conventional technology, a display panel needs to be photographed to obtain the display brightness of a plurality of preset gray scales, and the compensation parameter of each pixel is calculated by modeling the brightness of different gray scales. And when the display screen is powered on again, compensating the Mura by combining the calculated compensation parameters. The compensation mode in the traditional technology has a good display effect near the preset gray scale, but the phenomenon of over-compensation or under-compensation is easy to occur at the gray scale far away from the preset gray scale. In this case, the phenomenon of overcompensation or undercompensation is generally recognized by human eyes, and if the phenomenon of overcompensation or undercompensation exists, the compensation parameters are manually adjusted to obtain a desired display effect.
However, the adjustment of the compensation parameter in the conventional technique requires many attempts based on experience, and the process is relatively complicated.
Disclosure of Invention
In view of the above, it is necessary to provide a luminance compensation data generation method, a luminance compensation method, an apparatus, a computer device, and a storage medium capable of simplifying an adjustment process of a compensation parameter in order to solve the above-mentioned technical problems.
A method of luminance compensation data generation, the method comprising:
acquiring target brightness data, brightness compensation parameters and Mura area data to be compensated;
compensating the data to be compensated of the Mura area by using the brightness compensation parameter to obtain the brightness data of the Mura area;
determining a compensation adjustment parameter according to the target brightness data and the Mura region brightness data, wherein the compensation adjustment parameter is used for adjusting the brightness compensated by the brightness compensation parameter to the Mura region in the display process of a display screen;
and generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter.
In one embodiment, the determining a compensation adjustment parameter according to the target luminance data and the Mura region luminance data includes:
and when determining that overcompensation or undercompensation exists in the Mura region according to the target brightness data and the Mura region brightness data, determining compensation adjustment parameters according to the target brightness data and the Mura region brightness data.
In one embodiment, the determining that the Mura area is over-compensated or under-compensated according to the target luminance data and the Mura area luminance data includes:
acquiring the ratio of the target brightness data to the Mura region brightness data;
when the ratio is smaller than a preset ratio threshold, determining that overcompensation exists in the Mura area;
and when the ratio is greater than a preset ratio threshold, determining that under-compensation exists in the Mura area.
In one embodiment, the determining a compensation adjustment parameter according to the target luminance data and the Mura region luminance data includes:
acquiring the ratio of the target brightness data to the Mura region brightness data;
and determining the compensation adjustment parameter according to the ratio.
In one embodiment, the compensation adjustment parameter is determined using the following equation:
Figure BDA0003222553290000021
wherein, GainKRepresents the compensation adjustment parameter, LtargetRepresenting said target luminance data, LMuraRepresenting the Mura region luminance data. gamma is the default value for the display brightness and gray scale conversion relationship in the display industry.
A method of display brightness compensation, the method comprising:
acquiring brightness compensation data generated in any embodiment, wherein the brightness compensation data comprises a compensation adjustment parameter and a brightness compensation parameter;
performing first brightness compensation on the display brightness of the display screen by using the brightness compensation parameter to obtain first brightness data;
and performing second brightness compensation on the first brightness data by using the compensation adjustment parameter to adjust the first brightness data.
In one embodiment, the compensation adjustment parameter includes a first parameter corresponding to a first gray scale and a second parameter corresponding to a second gray scale; determining a compensation adjustment parameter corresponding to any gray scale between the first gray scale and the second gray scale by adopting the following method:
and performing linear interpolation according to the first parameter and the second parameter to obtain a compensation adjustment parameter corresponding to any gray scale.
An illumination compensation data generation apparatus, the apparatus comprising:
the data acquisition module is used for acquiring target brightness data, brightness compensation parameters and Mura area data to be compensated;
the Mura region compensation module is used for compensating the data to be compensated of the Mura region by using the brightness compensation parameters to obtain the brightness data of the Mura region;
an adjustment parameter determining module, configured to determine a compensation adjustment parameter according to the target luminance data and the Mura region luminance data, where the compensation adjustment parameter is used to adjust luminance compensated by the luminance compensation parameter for the Mura region in a display screen display process;
and the compensation data generation module is used for generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter.
A display brightness compensation apparatus, the apparatus comprising:
a compensation data obtaining module, configured to obtain luminance compensation data generated in any one of the embodiments, where the luminance compensation data includes a compensation adjustment parameter and a luminance compensation parameter;
the display brightness compensation module is used for performing first brightness compensation on the display brightness of the display screen by using the brightness compensation parameter to obtain first brightness data;
and the display brightness adjusting module is used for performing second brightness compensation on the first brightness data by using the compensation adjusting parameter so as to adjust the first brightness data.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method described above when executing the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
The brightness compensation data generation and brightness compensation method, device, computer equipment and storage medium obtain target brightness data, brightness compensation parameters and Mura area to-be-compensated data; compensating the data to be compensated in the Mura area by using the brightness compensation parameters to obtain the brightness data in the Mura area; determining compensation adjustment parameters according to the target brightness data and the Mura region brightness data; and generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter, so that the brightness compensation data is supplemented, and the accuracy of the brightness compensation data is improved. When the phenomenon of over-compensation or under-compensation exists, the brightness compensation is carried out through the compensation adjustment parameters, the adjustment process of the compensation parameters is simplified, and the tedious process of carrying out multiple attempts through manual adjustment of the compensation parameters is avoided.
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FIG. 1 is a diagram illustrating an exemplary embodiment of a method for generating luminance compensation data;
FIG. 2 is a flow chart illustrating a method for generating luminance compensation data according to an embodiment;
FIG. 3 is a flowchart illustrating a method for generating luminance compensation data according to another embodiment;
FIG. 4a is a flowchart illustrating a brightness compensation method according to an embodiment;
FIG. 4b is a schematic flow chart of gamma curves before and after compensation by using a compensation method in the conventional art;
FIG. 4c is a schematic flow chart of the compensation of the low gray scale gamma curve before and after the compensation by using the compensation method in the conventional art;
FIG. 4d is a schematic flow chart illustrating the compensation of the low gray scale gamma curve before and after compensation by the compensation method of the present application according to an embodiment;
FIG. 5 is a schematic diagram of linear interpolation in one embodiment;
FIG. 6 is a block diagram showing the structure of a luminance compensation data generating apparatus according to an embodiment;
FIG. 7 is a block diagram showing the structure of a luminance compensation apparatus according to an embodiment;
FIG. 8 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The method for generating the brightness compensation data can be applied to the application environment shown in fig. 1. Wherein, a connection is established between the data processing device 130 and the image acquisition device 120. The image acquisition device 120 acquires an image of the detection picture 110 displayed on the display screen and extracts corresponding brightness data, then the image acquisition device 120 sends the brightness data of the detection picture to the data processing device 120, and the data processing device 130 processes the brightness data of the detection picture 110 displayed on the display screen to obtain brightness compensation data corresponding to the detection picture. Specifically, the data processing device 130 obtains target luminance data, luminance compensation parameters, and data to be compensated in a Mura region; compensating the data to be compensated in the Mura area by using the brightness compensation parameters to obtain the brightness data in the Mura area; determining compensation adjustment parameters according to the target brightness data and the Mura region brightness data; and generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter. The data processing device 130 records the obtained brightness compensation data into a flash memory of the display screen 140 to be compensated. The brightness compensation data comprises a compensation adjustment parameter and a brightness compensation parameter; the display screen to be compensated 140 performs first brightness compensation on the display brightness of the display screen by using the brightness compensation parameter to obtain first brightness data; and performing second brightness compensation on the first brightness data by using the compensation adjustment parameter to adjust the first brightness data.
In one embodiment, as shown in fig. 2, a method for generating luminance compensation data is provided, which is exemplified by the method applied to the data processing apparatus 130 in fig. 1, and includes the following steps:
s210, obtaining target brightness data, brightness compensation parameters and Mura area data to be compensated.
The target brightness data may be an average value of all pixels in a selected arbitrary region of the display screen at an arbitrary gray level, and the arbitrary region may be referred to as a target region. The target luminance data may be luminance of a preset fixed value. The Mura area may be an area that needs to be subjected to brightness compensation, for example, the entire display screen may be used, or an area with a non-uniform display effect may be used.
For example, the luminance compensation parameter is obtained by taking a picture of an OLED or LCD display screen with a high resolution camera at a predetermined gray scale point (for example, 32 gray scale or 220 gray scale) to obtain an original picture at the predetermined gray scale point. Processing the shot original picture, wherein the processing process comprises the following steps: noise filtering, moire removing, distortion correcting, resolution restoring and the like to obtain a plurality of gray-scale pictures with the same resolution as the display screen, wherein the gray-scale value of each pixel in the pictures represents the brightness of the gray-scale lighted by the display screen. And performing linear fitting on the brightness values of the coordinate positions corresponding to the plurality of gray-scale pictures to obtain a curve equation, solving the curve equation to obtain two compensation parameters (marked as offset and gain) of each pixel, and obtaining the brightness compensation parameters. Further, the luminance compensation parameter may be written in a flash memory (flash) of the display screen driving IC.
The method comprises the steps of photographing a display screen under a preset gray scale by adopting an image acquisition device to obtain a picture corresponding to the preset gray scale, wherein a Mura area exists in the picture corresponding to the preset gray scale, and data to be compensated in the Mura area can be brightness data of each pixel in the Mura area in the picture corresponding to the preset gray scale.
S220, compensating the data to be compensated in the Mura area by using the brightness compensation parameters to obtain the brightness data in the Mura area.
Specifically, the luminance compensation parameters are read from the flash, and the data to be compensated in the Mura area is compensated by using the offset and gain in the luminance compensation parameters, so as to obtain the luminance data in the Mura area.
In some embodiments, the gamma curve of each pixel and the gamma curve of the target area can be calculated by using the brightness data obtained under the preset gray level point.
Figure BDA0003222553290000061
Figure BDA0003222553290000062
According to the compensation parameter gain and the compensation parameter offset obtained by the calculation, the gamma curve of the Mura area after brightness compensation becomes:
Figure BDA0003222553290000063
wherein L istargetA certain Gray level Gray for the target areaxBrightness value of LMuraFor a certain Gray level Gray of the Mura regionxThe luminance value of (a). L255targetIs the brightness value of the target area 255 in gray scale. L255muraIs the brightness value of 255 gray levels in the Mura region. gamma is the default value for the display brightness and gray scale conversion relationship in the display industry.
And S230, determining compensation adjustment parameters according to the target brightness data and the Mura area brightness data.
The display effect of the compensation mode in the traditional technology is good near the preset gray scale point, but the overcompensation or undercompensation phenomenon is easy to occur at the gray scale far away from the preset gray scale point. Illustratively, post-DeMura overcompensation or undercompensation of a display screen typically occurs below 16 gray levels and above 240 gray levels. The present embodiment proposes compensation adjustment parameters for the existing phenomena of over-compensation or under-compensation. The compensation adjustment parameter is used for adjusting the brightness compensated by the brightness compensation parameter to the Mura area in the display process of the display screen. That is, the Mura region is first compensated by the luminance compensation parameter, and if there is an overcompensation or an undercompensation, the compensated luminance is adjusted by the compensation adjustment parameter again.
Specifically, the Mura region brightness data is known through compensation of the Mura region, the target brightness data is known, the target brightness data is compared with the Mura region brightness data, and when the fact that the Mura region is over-compensated or under-compensated is determined according to the target brightness data and the Mura region brightness data, compensation adjustment parameters are determined according to the target brightness data and the Mura region brightness data.
In some embodiments, the Mura region is compensated for the luminance compensation parameter obtained at the predetermined gray scale point, the predetermined gray scale point and the size of any gray scale may be compared, and when any gray scale is closer to the predetermined gray scale point, the compensation adjustment parameter may not be calculated, and the compensation adjustment parameter is directly set to a fixed value, such as 1. When any gray scale is far from the preset gray scale point (for example, any gray scale is a low gray scale lower than 16 gray scale or 32 gray scale, or any gray scale is a high gray scale higher than 220 gray scale), the compensation adjustment parameter may be calculated according to the target luminance data and the Mura region luminance data, and the compensation adjustment parameter is determined according to the calculation result.
And S240, generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter.
Specifically, after the compensation is performed by using the luminance compensation parameter, the compensated Mura region has an overcompensation phenomenon or an undercompensation phenomenon, so that the compensated luminance needs to be adjusted again by using the compensation adjustment parameter, and it is apparent that the luminance of the Mura region needs to be adjusted by using the compensation adjustment parameter and the luminance compensation parameter at the same time. Therefore, the brightness compensation data is generated according to the compensation adjustment parameter and the brightness compensation parameter.
In the method for generating the brightness compensation data, target brightness data, brightness compensation parameters and Mura area data to be compensated are obtained; compensating the data to be compensated in the Mura area by using the brightness compensation parameters to obtain the brightness data in the Mura area; determining compensation adjustment parameters according to the target brightness data and the Mura region brightness data; and generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter, so that the brightness compensation data is supplemented, and the accuracy of the brightness compensation data is improved. When the phenomenon of over-compensation or under-compensation exists, the brightness compensation is carried out through the compensation adjustment parameters, the adjustment process of the compensation parameters is simplified, and the tedious process of carrying out multiple attempts through manual adjustment of the compensation parameters is avoided.
In one embodiment, determining the compensation adjustment parameter according to the target luminance data and the Mura region luminance data includes: and when determining that overcompensation or undercompensation exists in the Mura region according to the target brightness data and the Mura region brightness data, determining a compensation adjustment parameter according to the target brightness data and the Mura region brightness data.
In one embodiment, determining that the Mura area is over-compensated or under-compensated according to the target luminance data and the Mura area luminance data includes: acquiring the ratio of target brightness data to Mura region brightness data; when the ratio is smaller than a preset ratio threshold, determining that overcompensation exists in the Mura area; and when the ratio is larger than a preset ratio threshold, determining that under-compensation exists in the Mura area.
The preset ratio threshold may be set according to actual conditions, for example, the preset ratio threshold may be 1. Specifically, the ratio of the target luminance data to the Mura region luminance data is calculated, and whether overcompensation or undercompensation exists in the compensated display panel is automatically identified through the ratio. When the ratio is smaller than a preset ratio threshold, determining that overcompensation exists in the Mura area; and when the ratio is larger than a preset ratio threshold, determining that under-compensation exists in the Mura area.
In the embodiment, the automatic judgment of overcompensation and undercompensation is realized through the ratio between the target brightness data and the Mura regional brightness data, the phenomenon of overcompensation or undercompensation does not need to be identified through human eyes any more, the labor cost is reduced, and the working efficiency is improved.
In one embodiment, determining the compensation adjustment parameter according to the target luminance data and the Mura region luminance data includes: acquiring the ratio of target brightness data to Mura region brightness data; and determining a compensation adjustment parameter according to the ratio.
In one embodiment, the compensation adjustment parameter is determined using the following equation:
Figure BDA0003222553290000081
wherein L istargetRepresenting said target luminance data, LMuraAnd expressing the brightness data of the Mura area, wherein gamma is a default value of the conversion relation between display brightness and gray scale in the display industry.
Specifically, a gain K of the Mura region at each gray level with respect to the target luminance data is calculated. Wherein:
Figure BDA0003222553290000082
Figure BDA0003222553290000083
Figure BDA0003222553290000084
namely, it is
Figure BDA0003222553290000091
And calculating a compensation adjustment parameter according to the target brightness data and the Mura area brightness data.
In this embodiment, use is made of
Figure BDA0003222553290000092
And the overcompensation or undercompensation phenomenon of high gray scale or low gray scale caused by DeMura is compensated.
In one embodiment, as shown in fig. 3, a method for generating luminance compensation data is provided, which is exemplified by the method applied to the data processing apparatus 130 in fig. 1, and includes the following steps:
s302, obtaining target brightness data, brightness compensation parameters and Mura area data to be compensated.
S304, compensating the data to be compensated in the Mura area by using the brightness compensation parameters to obtain the brightness data in the Mura area.
S306, acquiring the ratio of the target brightness data to the Mura area brightness data.
And S308, when the ratio is smaller than a preset ratio threshold, determining that overcompensation exists in the Mura area.
And S310, when the ratio is larger than a preset ratio threshold, determining that under-compensation exists in the Mura area.
And S312, determining a compensation adjustment parameter according to the ratio.
And the compensation adjustment parameter is used for adjusting the brightness compensated by the brightness compensation parameter to the Mura area in the display process of the display screen. Specifically, the compensation adjustment parameter is determined using the following formula:
Figure BDA0003222553290000093
wherein, GainKRepresents the compensation adjustment parameter, LtargetRepresenting said target luminance data, LMuraRepresenting the Mura region luminance data. gamma is the default value for the display brightness and gray scale conversion relationship in the display industry.
And S314, generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter.
It should be understood that, although the steps in the above-described flowcharts are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least a part of the steps in the above-mentioned flowcharts may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the steps or the stages is not necessarily performed in sequence, but may be performed alternately or alternately with other steps or at least a part of the steps or the stages in other steps.
In one embodiment, as shown in fig. 4a, the present application provides a display brightness compensation method, which is described by taking the method as an example applied to the display screen 140 to be compensated in fig. 1, and includes the following steps:
and S410, acquiring the brightness compensation data obtained by the brightness compensation data generation method.
S420, performing first brightness compensation on the display brightness of the display screen by using the brightness compensation parameter to obtain first brightness data.
S430, performing a second brightness compensation on the first brightness data by using the compensation adjustment parameter to adjust the first brightness data.
Specifically, brightness compensation data is obtained from Flash, and the brightness compensation data comprises a compensation adjustment parameter and a brightness compensation parameter. The first brightness compensation may be performed on the display brightness of the display screen according to the following formula.
Figure BDA0003222553290000101
Wherein, GrayxIs the current gray scale of the display screen. gain and offset are two of the luminance compensation parameters. gamma is the default value for the display brightness and gray scale conversion relationship in the display industry. L255muraIs the brightness value of 255 gray levels in the Mura region.
And multiplying the compensation adjustment parameter corresponding to the current gray scale by the first brightness data to adjust the first brightness data.
In this embodiment, the first luminance data is obtained by obtaining the luminance compensation data obtained by the luminance compensation data generating method and performing the first luminance compensation on the display luminance of the display screen by using the luminance compensation parameter. And performing second brightness compensation on the first brightness data by using the compensation adjustment parameter to adjust the first brightness data. The overcompensation or under compensation phenomenon existing in the display screen is eliminated, more accurate compensation for the display screen is achieved, and the display effect is improved.
In some embodiments, a set of actually photographed DeMura gray-scale data is used for testing to obtain gamma curves before and after compensation of a certain Mura pixel and a gamma curve of target brightness, as shown in fig. 4 b. Amplifying the gamma curve of the low gray scale (as shown in fig. 4 c), it can be seen that, although the gamma curve adjusted at the middle gray scale is relatively fit with the target curve, the performance is not good at the low gray scale (for example, in the range of 0 to 31 gray scales), and the adjusted gamma curve has a certain difference from the target gamma curve. According to the display brightness compensation method, Gain of each gray level is calculated from 4 to 31 gray levels (in this embodiment, gray levels lower than 4 gray levels are not considered)KGain value (as shown in fig. 4 d), GainKThe gain value is multiplied by the gray scale after the DeMura compensation to obtain a low gray scale gamma curve as shown in FIG. 4d, and as can be seen from the curves in FIG. 4d, the adjusted low gray scale curve is closer to the target curve, so that the problem of low gray scale under-compensation can be effectively solved. The high gray scale curve is similar and not described herein.
In one embodiment, the compensation adjustment parameter includes a first parameter corresponding to a first gray scale and a second parameter corresponding to a second gray scale; determining a compensation adjustment parameter corresponding to any gray scale between the first gray scale and the second gray scale by adopting the following method: and performing linear interpolation according to the first parameter and the second parameter to obtain a compensation adjustment parameter corresponding to any gray scale.
In one embodiment, the gain value of each gray level in a range smaller than the first gray level (e.g. 32 gray levels) and larger than the second gray level (e.g. 240 gray levels) may not be stored in the driver IC of the display panel, and therefore, the gain value of each gray level may be stored by interpolation, for example, one gray level node is set every n gray levels, the gain value of each gray level is stored, and the gain value of the gray level between two gray level nodes is obtained by linear interpolation of the gain values of the two side nodes, as shown in fig. 5.
Suppose that two adjacent gray level points are gray1、gray2The corresponding gains are Gain respectivelyK1,GainK2Can be calculated to obtain the position in gray1And gray2Gray scale gray betweenxThe gain of (A) is:
Figure BDA0003222553290000111
for specific limitations of the display luminance compensation method, reference may be made to the above limitations of the luminance compensation data generation method, which are not described herein again.
In one embodiment, as shown in fig. 6, there is provided an illumination compensation data generating apparatus 600 including: a data obtaining module 610, a Mura region compensation module 620, an adjustment parameter determining module 630, and a compensation data generating module 640, wherein:
a data obtaining module 610, configured to obtain target luminance data, luminance compensation parameters, and data to be compensated in a Mura region;
a Mura region compensation module 620, configured to compensate the data to be compensated in the Mura region by using the brightness compensation parameter, so as to obtain brightness data in the Mura region;
an adjustment parameter determining module 630, configured to determine a compensation adjustment parameter according to the target luminance data and the Mura region luminance data, where the compensation adjustment parameter is used to adjust luminance compensated by using the luminance compensation parameter for a Mura region in a display process of a display screen;
and the compensation data generating module 640 is configured to generate luminance compensation data according to the compensation adjustment parameter and the luminance compensation parameter.
In an embodiment, the adjustment parameter determining module 630 is further configured to determine a compensation adjustment parameter according to the target luminance data and the Mura region luminance data when it is determined that the Mura region has overcompensation or undercompensation according to the target luminance data and the Mura region luminance data.
In an embodiment, the adjustment parameter determining module 630 is further configured to obtain a ratio between the target luminance data and the Mura region luminance data; when the ratio is smaller than a preset ratio threshold, determining that overcompensation exists in the Mura area; and when the ratio is greater than a preset ratio threshold, determining that under-compensation exists in the Mura area.
In an embodiment, the adjustment parameter determining module 630 is further configured to obtain a ratio between the target luminance data and the Mura region luminance data; and determining the compensation adjustment parameter according to the ratio.
In one embodiment, the compensation adjustment parameter is determined using the following equation:
Figure BDA0003222553290000121
wherein, GainKRepresents the compensation adjustment parameter, LtargetRepresenting said target luminance data, LMuraRepresenting the Mura region luminance data. gamma is the default value for the display brightness and gray scale conversion relationship in the display industry.
In one embodiment, as shown in fig. 7, there is provided a display luminance compensation apparatus 700 including: a compensation data obtaining module 710, a display brightness compensation module 720, and a display brightness adjustment module 730, wherein:
a compensation data obtaining module 710, configured to obtain luminance compensation data generated in the luminance compensation data generating method, where the luminance compensation data includes a compensation adjustment parameter and a luminance compensation parameter;
the display brightness compensation module 720 is configured to perform first brightness compensation on the display brightness of the display screen by using the brightness compensation parameter to obtain first brightness data;
the display brightness adjusting module 730 is configured to perform a second brightness compensation on the first brightness data by using the compensation adjusting parameter to adjust the first brightness data.
In one embodiment, the compensation adjustment parameter includes a first parameter corresponding to a first gray scale and a second parameter corresponding to a second gray scale; the device also comprises an adjusting parameter difference module which is used for carrying out linear interpolation according to the first parameter and the second parameter to obtain a compensation adjusting parameter corresponding to any gray scale.
For the specific limitations of the luminance compensation data generation device and the display luminance compensation device, reference may be made to the above limitations of the luminance compensation data generation method, which are not described herein again. The modules in the brightness compensation data generation device and the display brightness compensation device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 8. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a luminance compensation data generating method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 8 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, a computer device is provided, comprising a memory in which a computer program is stored and a processor which, when executing the computer program, implements the method in the above embodiments.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, is adapted to carry out the method of the above-mentioned embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A method of generating illumination compensation data, the method comprising:
acquiring target brightness data, brightness compensation parameters and Mura area data to be compensated;
compensating the data to be compensated of the Mura area by using the brightness compensation parameter to obtain the brightness data of the Mura area;
determining a compensation adjustment parameter according to the target brightness data and the Mura region brightness data, wherein the compensation adjustment parameter is used for adjusting the brightness compensated by the brightness compensation parameter to the Mura region in the display process of a display screen;
and generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter.
2. The method of claim 1, wherein determining compensation adjustment parameters based on the target luminance data and the Mura region luminance data comprises:
acquiring the ratio of the target brightness data to the Mura region brightness data;
when the ratio is smaller than a preset ratio threshold, determining that overcompensation exists in the Mura area;
when the ratio is larger than a preset ratio threshold, determining that under-compensation exists in the Mura area;
and when determining that overcompensation or undercompensation exists in the Mura region, determining compensation adjustment parameters according to the target brightness data and the Mura region brightness data.
3. The method of claim 1, wherein determining compensation adjustment parameters based on the target luminance data and the Mura region luminance data comprises:
acquiring the ratio of the target brightness data to the Mura region brightness data;
and determining the compensation adjustment parameter according to the ratio.
4. A method according to any one of claims 1 to 3, characterized in that the compensation adjustment parameter is determined using the following formula:
Figure FDA0003222553280000011
wherein, GainKRepresents the compensation adjustment parameter, LtargetRepresenting said target luminance data, LMuraAnd expressing the brightness data of the Mura area, wherein gamma is a default value of the conversion relation between display brightness and gray scale in the display industry.
5. A method for compensating display brightness, the method comprising:
acquiring brightness compensation data generated by any one of claims 1 to 4, the brightness compensation data comprising a compensation adjustment parameter and a brightness compensation parameter;
performing first brightness compensation on the display brightness of the display screen by using the brightness compensation parameter to obtain first brightness data;
and performing second brightness compensation on the first brightness data by using the compensation adjustment parameter to adjust the first brightness data.
6. The method of claim 5, wherein the compensation adjustment parameter comprises a first parameter corresponding to a first gray scale and a second parameter corresponding to a second gray scale; determining a compensation adjustment parameter corresponding to any gray scale between the first gray scale and the second gray scale by adopting the following method:
and performing linear interpolation according to the first parameter and the second parameter to obtain a compensation adjustment parameter corresponding to any gray scale.
7. An apparatus for generating luminance compensation data, the apparatus comprising:
the data acquisition module is used for acquiring target brightness data, brightness compensation parameters and Mura area data to be compensated;
the Mura region compensation module is used for compensating the data to be compensated of the Mura region by using the brightness compensation parameters to obtain the brightness data of the Mura region;
an adjustment parameter determining module, configured to determine a compensation adjustment parameter according to the target luminance data and the Mura region luminance data, where the compensation adjustment parameter is used to adjust luminance compensated by the luminance compensation parameter for the Mura region in a display screen display process;
and the compensation data generation module is used for generating brightness compensation data according to the compensation adjustment parameter and the brightness compensation parameter.
8. A display luminance compensation apparatus, characterized in that the apparatus comprises:
a compensation data obtaining module for obtaining the brightness compensation data generated by any one of claims 1 to 4, wherein the brightness compensation data comprises a compensation adjustment parameter and a brightness compensation parameter;
the display brightness compensation module is used for performing first brightness compensation on the display brightness of the display screen by using the brightness compensation parameter to obtain first brightness data;
and the display brightness adjusting module is used for performing second brightness compensation on the first brightness data by using the compensation adjusting parameter so as to adjust the first brightness data.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 6.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 6.
CN202110962368.6A 2021-08-20 2021-08-20 Brightness compensation data generation method, brightness compensation device and computer equipment Pending CN113658538A (en)

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