CN108877736B - Compensation method and device for eliminating uneven screen brightness - Google Patents
Compensation method and device for eliminating uneven screen brightness Download PDFInfo
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Abstract
The invention provides a compensation method and a compensation device for eliminating uneven screen brightness, and solves the problems of inaccurate brightness compensation data and poor screen brightness uniformity. The method comprises the following steps: acquiring brightness data of a screen body corresponding to a plurality of different gray scales under a plurality of brightness modes; acquiring brightness compensation data of the screen body corresponding to a plurality of different gray scales under various brightness modes according to the acquired brightness data; fitting a compensation function corresponding to each gray scale of the screen body in a plurality of different gray scales according to the acquired brightness compensation data; and calculating brightness compensation data of the screen body in any brightness mode according to the compensation function.
Description
Technical Field
The invention relates to the technical field of display, in particular to a compensation method and a compensation device for eliminating uneven screen brightness.
Background
The display panel is complex in production process and high in management and control difficulty, and the phenomenon of uneven brightness display, also called Mura phenomenon, is easily caused in the production process, namely the phenomenon of block-shaped traces in a certain area of the panel due to the difference of display brightness, so that the image display quality of the screen body is influenced.
At present, for Mura defects, the elimination is mainly carried out by the Demura technology. Specifically, the brightness of the image is compensated when the image is displayed, generally, the gray scale of the pixel in the brighter area on the display screen is multiplied by a smaller brightness compensation coefficient, and the gray scale of the pixel in the darker area is multiplied by a larger brightness compensation coefficient, so that the brightness of the brighter area is reduced, and the brightness of the darker area is increased, thereby improving the Mura phenomenon on the display screen to reduce the influence on the image display quality.
In the prior art, brightness compensation is mainly performed by collecting brightness data of each pixel in different gray scales in a certain brightness mode (such as a normal brightness mode) through a Demura device, and then generating brightness compensation data corresponding to each pixel of the panel through an algorithm, so that compensation processing is performed on a display picture to achieve the purpose of eliminating screen Mura. However, the brightness compensation data determined by this method is only determined in one brightness mode, and in actual display, the brightness corresponding to the same gray scale is different in different brightness modes (e.g. normal brightness mode or highlight mode), and the corresponding compensation data is also different, so the Mura compensation data obtained in one mode is most accurate only when compensated in the brightness mode, and it cannot meet the requirement of display effect to compensate the brightness in other brightness modes. Therefore, it can be seen that the method can bring about the problem of inaccurate compensation data in different brightness modes, and further cause the phenomenon of poor uniformity of screen brightness when displaying images, which affects display quality.
Disclosure of Invention
In view of this, embodiments of the present invention are directed to provide a compensation method and a compensation device for eliminating non-uniformity of screen brightness, so as to solve the problem that the compensation data is not accurate and the uniformity of screen brightness is still poor due to using data acquired in a brightness mode as brightness compensation data.
The invention provides a compensation method for eliminating uneven screen brightness, which comprises the following steps: acquiring brightness data of a screen body corresponding to a plurality of different gray scales under a plurality of brightness modes; acquiring brightness compensation data of the screen body corresponding to a plurality of different gray scales under various brightness modes according to the acquired brightness data; fitting a compensation function corresponding to each gray scale of the screen body in a plurality of different gray scales according to the acquired brightness compensation data; calculating brightness compensation data of the screen body in any brightness mode according to the compensation function; and performing brightness compensation on the screen body according to the brightness compensation data obtained by calculation.
In one embodiment, the compensation function corresponding to each gray scale of the screen body is obtained by taking one brightness mode of a plurality of brightness modes under each gray scale as a reference brightness mode and fitting the reference brightness mode with brightness compensation data under the reference brightness mode, wherein the reference brightness mode is the other brightness modes except the reference brightness mode; the luminance compensation data in any luminance mode is represented by the formula D (g, n') ═ D (g, l) + Fg*[(n′-l)/100]Calculating to obtain the gray scale of the screen, wherein g is the current gray scale corresponding to the screen, n 'is the target brightness value of the brightness mode to be compensated, l is the target brightness value of the reference brightness mode, D (g, n') is the brightness compensation data in the brightness mode to be compensated, D (g, l) is the brightness compensation data in the reference brightness mode, and FgAnd a compensation function of the screen body corresponding to the current gray scale g.
In one embodiment, the compensation function FgEach compensation sub-function f corresponding to the current gray scale g for the screen body under each reference brightness modegAverage value of (d); f. ofg100(D (g, n) -D (g, l))/(n-l), where n is a target luminance value of the reference luminance mode and D (g, n) is luminance compensation data in the reference luminance mode.
In one embodiment, the luminance data is a set of actual output luminance values for all pixels in the screen volumeCombining, wherein the brightness compensation data is a set of compensation coefficients of all pixel points in the screen body; acquiring brightness compensation data of the screen body corresponding to a plurality of different gray scales under a plurality of brightness modes according to the acquired brightness data comprises the following steps: detecting the actual input gray scale value of each pixel point; determining an actual gamma curve value of the screen body, and determining a target input gray level value corresponding to a target brightness value of the brightness mode according to the actual gamma curve value; by fitting the formula g2＝a*g1+ b, respectively fitting the actual input gray scale value and the target input gray scale value of each pixel point to obtain the compensation coefficients of all the pixel points, wherein g2Inputting a gray scale value, g, as a target1The gray scale values are actually input to the pixel points, and a and b are compensation coefficients.
Another aspect of the present invention provides a compensation apparatus for eliminating screen brightness unevenness, including: the acquisition module is used for acquiring the brightness data of the screen body corresponding to the different gray scales under the multiple brightness modes; the acquisition module is used for acquiring the brightness compensation data of the screen body corresponding to the different gray scales under various brightness modes according to the brightness data acquired by the acquisition module; the fitting module is used for fitting a compensation function corresponding to each gray scale of the screen body in a plurality of different gray scales according to the brightness compensation data acquired by the acquisition module; the computing module is used for computing the brightness compensation data of the screen body in any brightness mode according to the compensation function; and the compensation module is used for carrying out brightness compensation on the screen body according to the brightness compensation data calculated by the calculation module.
In one embodiment, the compensation function corresponding to each gray scale of the screen body is obtained by taking one brightness mode of a plurality of brightness modes under each gray scale as a reference brightness mode and fitting the reference brightness mode with brightness compensation data under the reference brightness mode, wherein the reference brightness mode is the other brightness modes except the reference brightness mode; the luminance compensation data in any luminance mode is represented by the formula D (g, n') ═ D (g, l) + Fg*[(n′-l)/100]Calculating to obtain the gray scale of the screen, wherein g is the current gray scale corresponding to the screen, n' is the target brightness value of the brightness mode to be compensated, l is the target brightness value of the reference brightness mode, and D (g, n)') luminance compensation data in luminance mode to be compensated, D (g, l) luminance compensation data in reference luminance mode, FgAnd a compensation function of the screen body corresponding to the current gray scale g.
In one embodiment, the compensation function FgEach compensation sub-function f corresponding to the current gray scale g for the screen body under each reference brightness modegAverage value of (d); f. ofg100(D (g, n) -D (g, l))/(n-l), where n is a target luminance value of the reference luminance mode and D (g, n) is luminance compensation data in the reference luminance mode.
In one embodiment, the brightness data is a set of actual output brightness values of all pixel points in the screen body, and the brightness compensation data is a set of compensation coefficients of all pixel points in the screen body; the acquisition module comprises: the detection unit is used for detecting the actual input gray level value of each pixel point; the determining unit is used for determining an actual gamma curve value of the screen body and determining a target input gray level value corresponding to a target brightness value of the brightness mode according to the actual gamma curve value; a fitting unit for fitting the formula g2＝a*g1+ b, respectively fitting the actual input gray scale value and the target input gray scale value of each pixel point to obtain the compensation coefficients of all the pixel points, wherein g2Inputting a gray scale value, g, as a target1The gray scale values are actually input to the pixel points, and a and b are compensation coefficients.
Embodiments of the present invention further provide a computer device, which includes a memory, a processor, and a computer program stored in the memory and executed by the processor, where the processor implements the steps of any one of the above methods when executing the computer program.
Embodiments of the present invention also provide a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps of any one of the above methods.
The compensation method for eliminating the uneven brightness of the screen body comprises the steps of firstly collecting brightness data of the screen body corresponding to a plurality of different gray scales in a plurality of brightness modes, then obtaining the brightness compensation data of the screen body corresponding to the different gray scales in the brightness modes through a compensation algorithm and Demura equipment according to the collected brightness data, fitting a compensation function corresponding to each gray scale of the screen body according to the obtained brightness compensation data, and calculating the brightness compensation data of the screen body corresponding to any gray scale in any brightness mode through the function relation. The embodiment of the invention fully considers the actual situation that the brightness corresponding to the same gray scale is different in different brightness modes, provides different brightness compensation data for the same gray scale in different brightness modes, improves the accuracy of the brightness compensation data, effectively solves the problem that the brightness uniformity of an actual display image is poor due to the fact that the brightness compensation data is a fixed value, and further improves the display effect. In addition, the method provided by the embodiment of the present invention maps the relationship between the luminance compensation data in different luminance modes of the same gray scale to the compensation function corresponding to the gray scale, so that only the luminance compensation data in the selected reference luminance mode and the compensation function corresponding to the gray scale need to be stored in the post-storage, and compared with the method for storing all the compensation data corresponding to the gray scale in a plurality of luminance modes, the method not only greatly reduces the storage space, but also has stronger applicability, can be better suitable for the compensation of a plurality of common luminance modes, and has no limitation on the luminance value.
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Fig. 1 is a flowchart illustrating a compensation method for eliminating uneven screen brightness according to an embodiment of the present invention.
Fig. 2 is a detailed flowchart of step 102 in fig. 1.
Fig. 3 is a schematic structural diagram of a compensation apparatus for eliminating uneven screen brightness according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart illustrating a compensation method for eliminating uneven screen brightness according to an embodiment of the present invention. As shown in fig. 1, the method includes:
step 101: and acquiring brightness data of the screen body corresponding to the different gray scales under various brightness modes.
Those skilled in the art will appreciate that the panel of the display device generally has a plurality of brightness modes, such as a normal brightness mode, a high brightness mode, and a low brightness mode, and pixels in the displayed image may have different gray scales, such as 16 gray scales, 32 gray scales, 64 gray scales, 96 gray scales, 128 gray scales, 192 gray scales, and so on. In the present embodiment, a plurality of luminance modes are selected, and luminance data corresponding to a plurality of different gray scales in the luminance modes are respectively collected, specifically, luminance data corresponding to gray scales between 250nit and 650nit (i.e., 250nit, 350nit, 450nit, 550nit, and 650nit) respectively corresponding to 16 gray scales, 32 gray scales, 64 gray scales, 96 gray scales, 128 gray scales, and 192 gray scales can be collected respectively, if 100nit is used as a step length.
In an embodiment of the present invention, the luminance data is a set of actual output luminance values of all pixel points in the screen body, and it can be understood by those skilled in the art that a pixel generally includes a plurality of sub-pixels, such as three sub-pixels including red, green and blue, and the set is actually a set of actual output luminance values of all sub-pixel points in the screen body. The luminance data may be collected by a Demura device, for example, the Demura device is required to collect luminance data corresponding to 16 gray scales, 32 gray scales, 64 gray scales, 96 gray scales, 128 gray scales and 192 gray scales in 250nit, 350nit, 450nit, 550nit and 650nit luminance modes, respectively (each pixel includes three subpixels of red, green and blue), and then the size of the data quantity collected in each luminance mode is (Hsize 6 x 3) × Vsize, which is a matrix, where Hsize and Vsize represent the number of pixels in the horizontal direction and the vertical direction of the panel body, and 6 and 3 represent the number of sampling gray scales and the number of subpixels contained in each pixel, respectively.
In an embodiment of the present invention, the Demura device may convert the acquired actual output luminance value into a luminance coefficient that is convenient for the Demura device to calculate, if the preset target luminance value is 350nit, and the Demura device acquires the actual output luminance value of a certain sub-pixel as 330nit, the Demura device may convert the actual output luminance value into a coefficient of 0.94(330nit/350nit ≈ 0.94), which also indicates that the actual output luminance value of the sub-pixel does not reach the preset luminance standard.
Step 102: and acquiring brightness compensation data of the screen body corresponding to a plurality of different gray scales under various brightness modes according to the acquired brightness data.
In an embodiment of the present invention, the luminance compensation data is a set of compensation coefficients of all pixel points in the screen body, and the pixel point may also include a plurality of sub-pixel points. The brightness compensation data can be obtained through a compensation algorithm and Demura equipment together, wherein the compensation algorithm mainly utilizes a Gamma curve principle, and the Demura equipment can automatically fit corresponding compensation coefficients for each sub-pixel according to the data obtained through the compensation algorithm.
In an embodiment of the present invention, as shown in fig. 2, the step 102 may specifically include the following steps:
step 1021: detecting the actual input gray scale value of each pixel point;
step 1022: determining an actual gamma curve value of the screen body, and determining a target input gray level value corresponding to a target brightness value of the brightness mode according to the actual gamma curve value;
those skilled in the art will understand that each sub-pixel of each screen corresponds to an actual input gray level (i.e., an objective physical quantity of an object recognized by a computer) and an actual output luminance value (i.e., a subjective luminance perception of human eyes), and there is a non-linear mapping relationship between them, which can be characterized by a Gamma curve. This mapping relationship, which may also be referred to as a Gamma mathematical model, is usually expressed by default as the formula output luminance — input gray scale Gamma.
In the process of acquiring compensation data in the prior art, generally, Gamma 2.2 with a screen body as a standard is calculated, but in actual production, it is difficult to accurately control the Gamma curve value of each display screen, so that the compensation data acquired in the way of the default Gamma value affects the final effect. In this embodiment, the actual Gamma curve value of the screen body can be obtained through the relationship between the actual output luminance value of each sub-pixel collected in step 101 and the actual input gray level value detected in step 1021, and the accuracy of the luminance compensation data is improved to a great extent by performing subsequent calculation according to the actual Gamma curve value.
Assuming that the screen body comprises N sub-pixel points, N Gamma curve values can be calculated according to the relationship between the actual output brightness value and the actual input gray scale value of each sub-pixel point. In an embodiment of the present invention, an average value of the N Gamma curve values may be used as an actual Gamma curve value of the screen body. In other embodiments, the arithmetic squared value of the N Gamma curve values may also be used as the actual Gamma curve value of the screen body; or the Gamma curve value calculated by the sub-pixel of the central point of the screen body is used as the actual Gamma curve value of the screen body, because the central point of the screen body is the area with the best optical quality in the actual production process of the display screen. For the specific value of the Gamma curve, those skilled in the art can make different settings according to the actual requirements, and the present invention is not limited to this.
Since the preset target brightness values in various brightness modes are known, for example, the target brightness value of the screen in the normal brightness mode is 350nit, the target input gray-scale value corresponding to the target brightness value of the screen in the brightness mode can be obtained through the relationship between the determined actual Gamma curve value and the target brightness value in a certain brightness mode. In practical implementation, the compensation data can be obtained for a plurality of gray scales corresponding to each brightness mode, which requires the above calculation for each different gray scale in each brightness mode.
Step 1023: by fitting the formula g2＝a*g1+ b, respectively fitting the actual input gray scale value and the target input gray scale value of each pixel point to obtain the compensation coefficients of all the pixel points, wherein g2Inputting a gray scale value, g, as a target1The gray scale values are actually input to the pixel points, and a and b are compensation coefficients.
By passingThe compensation algorithm obtains a target input gray scale value g of the screen body2And the actual input gray scale value g of each sub-pixel1Then, the Demura equipment can be used according to the fitting formula g2＝a*g1And + b is that each sub-pixel point automatically fits a corresponding compensation coefficient a and b, wherein a represents the gain of the gray level value, and b represents the deviation value.
The set of the compensation coefficients a and b of each sub-pixel constitutes the brightness compensation data of the screen body corresponding to a certain gray scale in a certain brightness mode, and the compensation data can be represented by D (m, n), where m represents the gray scale of the screen body, and m represents a preset target brightness value. Still taking the example of obtaining the brightness compensation data corresponding to the six gray levels of 16 gray levels, 32 gray levels, 64 gray levels, 96 gray levels, 128 gray levels and 192 gray levels in the five brightness modes of 250nit, 350nit, 450nit, 550nit and 650nit, the finally obtained brightness compensation data can be expressed as shown in table 1:
TABLE 1 luminance compensation data representation for different gray levels in each luminance mode
Taking the normal luminance mode (the target luminance value is 350nit) as an example, the total size of the luminance compensation data is also (Hsize × 6 × 3) × Vsize, which is a matrix, where Hsize and Vsize respectively represent the number of pixels in the horizontal direction and the vertical direction of the panel, and 6 and 3 respectively represent the number of sampled grays and the number of sub-pixels included in each pixel.
Step 103: and fitting a compensation function corresponding to each gray scale of the screen body according to the acquired brightness compensation data.
In an embodiment of the invention, the compensation function corresponding to each gray scale is obtained by fitting the luminance compensation data in one of the luminance modes as a reference luminance mode and in combination with the luminance compensation data in the other luminance modes (which may be referred to as reference luminance modes).
Specifically, in one embodiment, the compensation function FgCan be paired with the screen body under each reference brightness modeRespective compensation sub-functions f of the pre-gray scale ggIn other embodiments, the compensation function FgFor each compensation sub-function fgThe present invention is not limited to the specific relationship between the two.
Compensating sub-function fgSimilar to a proportional function, in one embodiment of the present invention, the compensation sub-function fg100(D (g, n) -D (g, l))/(n-l), where g is a current gray scale corresponding to the screen body, n is a target luminance value of the reference luminance mode, l is a target luminance value of the reference luminance mode, D (g, n) is luminance compensation data in the reference luminance mode, and D (g, l) is luminance compensation data in the reference luminance mode.
For example, using the luminance pattern with the target luminance value of 350nit (normal luminance pattern) as the reference luminance pattern, and using the luminance patterns with the target luminance values of 250nit, 450nit, 550nit and 650nit as the reference luminance pattern, the compensation sub-functions f of 128 gray scales are corresponding to the screen body128Fitting can be carried out by taking D (128,350) as reference data and combining D (128,250), D (128,450), D (128,550) and D (128,650). Specifically, the compensation sub-function f corresponding to the target luminance value of 250nit128,250Can be represented by the functional relation f128,250100(D (128,250) -D (128,350))/(250-128,，450Can be represented by the relation f128,，450100(D (128,450) -D (128,350))/(450-128,，550Can be represented by the relation f128,，550100(D (128,550) -D (128,350))/(550-128,，650Can be represented by the relation f128,，650100(D (128,650) -D (128,350))/(650-128,，250，f128,，450，f128,，550And f128,，650The compensation function F of 128 gray scales corresponding to the screen body can be obtained128. For the same reason, the compensation function F of the other five gray levels192、F96、F64、F32And F16Can also be measured by the methodAnd (5) calculating to obtain.
Step 104: and calculating brightness compensation data of the screen body in any brightness mode according to the compensation function.
Obtaining a compensation function F corresponding to the certain gray scalegThen, according to the compensation function FgAnd obtaining the brightness compensation data under any brightness mode corresponding to the gray scale. Specifically, the luminance compensation data in any luminance mode can be represented by the formula D (g, n') ═ D (g, l) + Fg*[(n′-l)/100]And calculating to obtain the brightness compensation data, wherein g is the current gray scale corresponding to the screen body, n 'is the target brightness value of the brightness mode to be compensated, l is the target brightness value of the reference brightness mode, D (g, n') is the brightness compensation data in the brightness mode to be compensated, and D (g, l) is the brightness compensation data in the reference brightness mode. For example, still using the luminance mode (normal luminance mode) with the target luminance value of 350nit as the reference luminance mode, when the computing screen body corresponds to the luminance compensation data of the gray scale 128 when the target luminance value is 200nit, only n' is 200nit and the compensation function F are needed128Substituting the above formula to obtain the corresponding brightness compensation data D (128,200) as D (128,350) + F128*[(200-350)/100]。
Step 105: and performing brightness compensation on the screen body according to the brightness compensation data obtained by calculation.
In this step, the brightness compensation is performed on the screen body to be compensated according to the brightness compensation data calculated in step 104 and the conventional brightness mura compensation method.
The compensation method for eliminating the uneven brightness of the screen body comprises the steps of firstly collecting brightness data of the screen body corresponding to a plurality of different gray scales in a plurality of brightness modes, then obtaining brightness compensation data of the screen body corresponding to the different gray scales in the brightness modes through a compensation algorithm and Demura equipment according to the collected brightness data, fitting a compensation function corresponding to each gray scale of the screen body according to the obtained brightness compensation data, and calculating the brightness compensation data of the screen body corresponding to any gray scale in any brightness mode through the function relation. The embodiment of the invention fully considers the actual situation that the brightness corresponding to the same gray scale is different in different brightness modes, provides different brightness compensation data for the same gray scale in different brightness modes, improves the accuracy of the brightness compensation data, effectively solves the problem that the brightness uniformity of an actual display image is poor due to the fact that the brightness compensation data is a fixed value, and further improves the display effect. In addition, the method provided by the embodiment of the present invention maps the relationship between the luminance compensation data in different luminance modes of the same gray scale to the compensation function corresponding to the gray scale, so that only the luminance compensation data in the selected reference luminance mode and the compensation function corresponding to the gray scale need to be stored in the post-storage, and compared with the method for storing all the compensation data corresponding to the gray scale in a plurality of luminance modes, the method not only greatly reduces the storage space, but also has stronger applicability, can be better suitable for the compensation of a plurality of common luminance modes, and has no limitation on the luminance value.
Fig. 3 is a schematic structural diagram of a compensation apparatus for eliminating uneven screen brightness according to an embodiment of the present invention. As shown in fig. 3, the apparatus includes an acquisition module 10, an acquisition module 20, a fitting module 30, a calculation module 40, and a compensation module 50.
The collecting module 10 is used for collecting brightness data of the screen body corresponding to a plurality of different gray scales in a plurality of brightness modes.
In an embodiment of the present invention, the luminance data is a set of actual output luminance values of all pixel points in the screen body, and those skilled in the art can understand that one pixel generally includes a plurality of sub-pixels, so that the set is actually a set of actual output luminance values of all sub-pixel points in the screen body. The acquisition module 10 may be a Demura device, for example, the Demura device is required to acquire luminance data corresponding to 16 gray scales, 32 gray scales, 64 gray scales, 96 gray scales, 128 gray scales and 192 gray scales in 250nit, 350nit, 450nit, 550nit and 650nit luminance modes, respectively (each pixel includes three subpixels of red, green and blue), and the size of the data amount acquired in each luminance mode is (Hsize 6 × 3) × Vsize, which is a matrix, where Hsize and Vsize respectively represent the number of pixels in the horizontal direction and the vertical direction of the panel, and 6 and 3 respectively represent the number of sampling gray scales and the number of subpixels included in each pixel.
In an embodiment of the present invention, the Demura device may convert the acquired actual output luminance value into a luminance coefficient that is convenient for the Demura device to calculate, if the preset target luminance value is 350nit, and the Demura device acquires the actual output luminance value of a certain sub-pixel as 330nit, the Demura device may convert the actual output luminance value into a coefficient of 0.94(330nit/350nit ≈ 0.94), which also indicates that the actual output luminance value of the sub-pixel does not reach the preset luminance standard.
The obtaining module 20 is configured to obtain, according to the brightness data collected by the collecting module 10, brightness compensation data of the screen body corresponding to a plurality of different gray scales in a plurality of brightness modes.
In an embodiment of the present invention, the luminance compensation data is a set of compensation coefficients of all pixel points in the screen body, and the pixel point may also include a plurality of sub-pixel points. The brightness compensation data can be obtained through a compensation algorithm and Demura equipment together, wherein the compensation algorithm mainly utilizes a Gamma curve principle, and the Demura equipment automatically fits corresponding compensation coefficients for each sub-pixel according to the data obtained through the compensation algorithm.
In an embodiment of the present invention, as shown in fig. 3, the obtaining module 20 may specifically include a detecting unit 21, a determining unit 22, and a fitting unit 23. The detecting unit 21 is configured to detect an actual input gray level value of each pixel, and the determining unit 22 is configured to determine an actual gamma curve value of the screen body, and determine a target input gray level value corresponding to a target brightness value of the brightness mode according to the actual gamma curve value.
Those skilled in the art will understand that each sub-pixel of each screen corresponds to an actual input gray scale value (i.e., an objective physical quantity of a computer-recognized object) and an actual output luminance value (i.e., a subjective luminance perception of human eyes), and there is a non-linear mapping relationship between them, which can be represented by a Gamma curve, and is usually expressed by default as a formula output luminance — input gray scale Gamma.
In the process of acquiring compensation data in the prior art, generally, Gamma 2.2 with a screen body as a standard is calculated, but in actual production, it is difficult to accurately control the Gamma curve value of each display screen, so that the compensation data acquired in the way of the default Gamma value affects the final effect. In this embodiment, the determining unit 22 may obtain an actual Gamma curve value of the screen body through a relationship between an actual output luminance value of each sub-pixel collected by the collecting module 10 and an actual input gray-scale value detected by the detecting unit 21, and then perform subsequent calculation according to the actual Gamma curve value, which improves the accuracy of the luminance compensation data to a great extent.
Assuming that the screen body comprises N sub-pixel points, N Gamma curve values can be calculated according to the relationship between the actual output brightness value and the actual input gray scale value of each sub-pixel point. In an embodiment of the present invention, an average value of the N Gamma curve values may be used as an actual Gamma curve value of the screen body. In other embodiments, the arithmetic squared value of the N Gamma curve values may also be used as the actual Gamma curve value of the screen body; or the Gamma curve value obtained by calculating the sub-pixel of the central point of the screen body is used as the actual Gamma curve value of the screen body. For the specific value of the Gamma curve, those skilled in the art can make different settings according to the actual requirements, and the present invention is not limited to this.
Since the preset target brightness values in various brightness modes are known, for example, the target brightness value of the screen body in the normal brightness mode is 350nit, the target input gray-scale value corresponding to the target brightness value of the screen body in the brightness mode can be obtained through the relationship between the actual Gamma curve value determined by the determining unit 22 and the target brightness value in a certain brightness mode.
The fitting unit 23 is used for fitting the formula g2＝a*g1+ b, respectively fitting the actual input gray scale value and the target input gray scale value of each pixel point to obtain the compensation coefficients of all the pixel points, wherein g2Inputting a gray scale value, g, as a target1The gray scale values are actually input to the pixel points, and a and b are compensation coefficients.
According to the actual input gray-scale value g of each sub-pixel point detected by the detection unit 211And the screen body determined by the determining unit 22Target input gray scale value g2The fitting unit 23 can use the fitting formula g2＝a*g1And + b is that corresponding compensation coefficients a and b are automatically fitted for each sub-pixel point, wherein a represents the gain of the gray level value, and b represents the deviation value.
The set of the compensation coefficients a and b of each sub-pixel constitutes the brightness compensation data of the screen corresponding to a certain gray scale in a certain brightness mode, and the compensation data can be represented by D (m, n), where m represents the gray scale of the screen, and m represents a preset target brightness value. Taking the normal luminance mode (the target luminance value is 350nit) as an example, the total size of the luminance compensation data is also (Hsize × 6 × 3) × Vsize, which is a matrix, where Hsize and Vsize respectively represent the number of pixels in the horizontal direction and the vertical direction of the panel, and 6 and 3 respectively represent the number of sampled grays and the number of sub-pixels included in each pixel.
The fitting module 30 is configured to fit a compensation function corresponding to each gray scale of the screen body in a plurality of different gray scales according to the brightness compensation data acquired by the acquiring module 20.
In an embodiment of the invention, the compensation function corresponding to each gray scale is obtained by fitting the luminance compensation data in one of the luminance modes as a reference luminance mode and in combination with the luminance compensation data in the other luminance modes (which may be referred to as reference luminance modes).
Specifically, in one embodiment, the compensation function FgCan be each compensation sub-function f of the screen body corresponding to the current gray scale g under each reference brightness modegIn other embodiments, the compensation function FgFor each compensation sub-function fgThe present invention is not limited to the specific relationship between the two.
Compensating sub-function fgSimilar to a proportional function, in one embodiment of the present invention, the compensation sub-function fg100(D (g, n) -D (g, l))/(n-l), where g is the current gray scale corresponding to the screen body, n is the target brightness value of the reference brightness mode, l is the target brightness value of the reference brightness mode, D (g, n) is the brightness compensation data in the reference brightness mode, and D (g, l) is the reference brightness modeLuminance compensation data in a luminance mode. For the compensation sub-function fgThe specific calculation method of (1) is described in detail in the embodiments of the above method, and is not described herein again.
The calculation module 40 is used for calculating the compensation function FgAnd calculating the brightness compensation data of the screen body in any brightness mode.
Obtaining the compensation function F corresponding to the certain gray scale through the fitting module 30gThen, the calculation module 40 can calculate the compensation function F according to the compensation functiongAnd obtaining the brightness compensation data under any brightness mode corresponding to the gray scale. Specifically, the luminance compensation data in any luminance mode can be represented by the formula D (g, n') ═ D (g, l) + Fg*[(n′-l)/100]And calculating to obtain the brightness compensation data, wherein g is the current gray scale corresponding to the screen body, n 'is the target brightness value of the brightness mode to be compensated, l is the target brightness value of the reference brightness mode, D (g, n') is the brightness compensation data in the brightness mode to be compensated, and D (g, l) is the brightness compensation data in the reference brightness mode. For example, still using the luminance mode (normal luminance mode) with the target luminance value of 350nit as the reference luminance mode, when the computing screen body corresponds to the luminance compensation data of the gray scale 128 when the target luminance value is 200nit, only n' is 200nit and the compensation function F are needed128Substituting the above formula to obtain the corresponding brightness compensation data D (128,200) as D (128,350) + F128*[(200-350)/100]。
The compensation module 50 is configured to perform brightness compensation on the screen according to the brightness compensation data calculated by the calculation module 40, and specifically, the compensation module 50 performs brightness compensation on the screen to be compensated by using the existing brightness mura compensation method.
In the compensation device for eliminating uneven brightness of the screen body provided by the embodiment of the invention, the acquisition module is used for acquiring the brightness data of the screen body corresponding to a plurality of different gray scales in a plurality of brightness modes, the acquisition module is used for acquiring the brightness compensation data of the screen body corresponding to the different gray scales in the brightness modes according to the brightness data acquired by the acquisition module, the fitting module is used for fitting the compensation function corresponding to each gray scale of the screen body according to the brightness compensation data acquired by the acquisition module, and the calculation module can calculate the brightness compensation data of the screen body corresponding to any one gray scale in any one brightness mode according to the function relation. The embodiment of the invention fully considers the actual situation that the brightness corresponding to the same gray scale is different in different brightness modes, provides different brightness compensation data for the same gray scale in different brightness modes, improves the accuracy of the brightness compensation data, effectively solves the problem that the brightness uniformity of an actual display image is poor due to the fact that the brightness compensation data is a fixed value, and further improves the display effect. In addition, the device provided in the embodiment of the present invention maps the relationship between the luminance compensation data in the same gray scale and different luminance modes to the compensation function corresponding to the gray scale through the fitting module, so that only the luminance compensation data in the selected reference luminance mode and the compensation function corresponding to the gray scale need to be stored in the post-storage.
An embodiment of the present invention further provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executed by the processor, wherein the processor executes the computer program to implement the steps of the compensation method as described in any of the foregoing embodiments.
An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the compensation method as described in any of the previous embodiments. The computer storage medium may be any tangible medium, such as a floppy disk, a CD-ROM, a DVD, a hard drive, or a network medium.
It should be understood that although one implementation form of the embodiments of the present invention described above may be a computer program product, the method or apparatus of the embodiments of the present invention may be implemented in software, hardware, or a combination of software and hardware. The hardware portion may be implemented using dedicated logic; the software portions may be stored in a memory and executed by a suitable instruction execution system, such as a microprocessor or specially designed hardware. It will be appreciated by those of ordinary skill in the art that the methods and apparatus described above may be implemented using computer executable instructions and/or embodied in processor control code, such code provided for example on a carrier medium such as a disk, CD or DVD-ROM, programmable memory such as read only memory (firmware) or a data carrier such as an optical or electronic signal carrier. The methods and apparatus of the present invention may be implemented in hardware circuitry, such as very large scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field programmable gate arrays, programmable logic devices, or in software for execution by various types of processors, or in a combination of hardware circuitry and software, such as firmware.
It should be understood that although several modules/units of the apparatus are mentioned in the above detailed description, such division is merely exemplary and not mandatory. Indeed, according to exemplary embodiments of the invention, the features and functions of two or more modules/units described above may be implemented in one module/unit, whereas the features and functions of one module/unit described above may be further divided into implementations by a plurality of modules/units. Furthermore, some of the modules/units described above may be omitted in some application scenarios.
It is to be understood that the description has described only some of the key, not necessarily essential, techniques and features, and may not have described features that could be implemented by those skilled in the art, in order not to obscure the embodiments of the invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A compensation method for eliminating uneven screen brightness is characterized by comprising the following steps:
acquiring brightness data of the screen body corresponding to a plurality of different gray scales under a plurality of brightness modes;
acquiring brightness compensation data of the screen body corresponding to a plurality of different gray scales under a plurality of brightness modes according to the acquired brightness data;
fitting a compensation function corresponding to each gray scale of the screen body in the plurality of different gray scales according to the acquired brightness compensation data;
calculating brightness compensation data of the screen body in any brightness mode according to the compensation function; and
performing brightness compensation on the screen body according to the brightness compensation data obtained by calculation;
wherein the plurality of brightness modes are brightness modes at different target brightness values.
2. The compensation method for eliminating screen brightness unevenness according to claim 1,
the compensation function corresponding to each gray scale of the screen body is obtained by taking one brightness mode of a plurality of brightness modes under each gray scale as a reference brightness mode and fitting the reference brightness mode with brightness compensation data under the reference brightness mode, wherein the reference brightness mode is other brightness modes except the reference brightness mode in the plurality of brightness modes;
the luminance compensation data in any luminance mode is represented by the formula D (g, n') ═ D (g, l) + Fg*[(n′-l)/100]Calculating to obtain, wherein g is a current gray scale corresponding to the screen body, n 'is a target brightness value of a brightness mode to be compensated, l is a target brightness value of the reference brightness mode, D (g, n') is brightness compensation data in the brightness mode to be compensated, D (g, l) is brightness compensation data in the reference brightness mode, and FgAnd a compensation function corresponding to the current gray scale g for the screen body.
3. The compensation method for eliminating screen brightness unevenness according to claim 2, wherein the compensation function F isgFor each of said reference lights of said screen bodyEach compensation sub-function f corresponding to the current gray scale g in the degree modegAverage value of (d);
f isg100(D (g, n) -D (g, l))/(n-l), wherein n is a target luminance value of the reference luminance mode, and D (g, n) is luminance compensation data in the reference luminance mode.
4. The compensation method for eliminating the uneven brightness of the screen according to claim 1, wherein the brightness data is a set of actual output brightness values of all pixels in the screen, and the brightness compensation data is a set of compensation coefficients of all pixels in the screen;
the acquiring brightness compensation data of the screen body corresponding to a plurality of different gray scales in a plurality of brightness modes according to the acquired brightness data comprises:
detecting the actual input gray-scale value of each pixel point;
determining an actual gamma curve value of the screen body, and determining a target input gray level value corresponding to a target brightness value of the brightness mode according to the actual gamma curve value;
by fitting the formula g2＝a*g1+ b, respectively fitting the actual input gray-scale value and the target input gray-scale value of each pixel point to obtain the compensation coefficients of all the pixel points, wherein g is2Inputting the gray scale value for the target, g1And a and b are compensation coefficients for the actual input gray-scale value of the pixel point.
5. A compensation device for eliminating uneven screen brightness is characterized by comprising:
the acquisition module is used for acquiring the brightness data of the screen body corresponding to a plurality of different gray scales under a plurality of brightness modes;
the acquisition module is used for acquiring the brightness compensation data of the screen body corresponding to a plurality of different gray scales under a plurality of brightness modes according to the brightness data acquired by the acquisition module;
the fitting module is used for fitting a compensation function corresponding to each gray scale of the screen body in the different gray scales according to the brightness compensation data acquired by the acquiring module;
the calculation module is used for calculating the brightness compensation data of the screen body in any brightness mode according to the compensation function; and
the compensation module is used for carrying out brightness compensation on the screen body according to the brightness compensation data calculated by the calculation module;
wherein the plurality of brightness modes are brightness modes at different target brightness values.
6. The compensation apparatus for eliminating screen brightness unevenness according to claim 5,
the compensation function corresponding to each gray scale of the screen body is obtained by taking one brightness mode of a plurality of brightness modes under each gray scale as a reference brightness mode and fitting the reference brightness mode with brightness compensation data under the reference brightness mode, wherein the reference brightness mode is other brightness modes except the reference brightness mode in the plurality of brightness modes;
the luminance compensation data in any luminance mode is represented by the formula D (g, n') ═ D (g, l) + Fg*[(n′-l)/100]Calculating to obtain, wherein g is a current gray scale corresponding to the screen body, n 'is a target brightness value of a brightness mode to be compensated, l is a target brightness value of the reference brightness mode, D (g, n') is brightness compensation data in the brightness mode to be compensated, D (g, l) is brightness compensation data in the reference brightness mode, and FgAnd a compensation function corresponding to the current gray scale g for the screen body.
7. The compensation apparatus for eliminating screen brightness unevenness according to claim 6,
said compensation function FgFor each compensation sub-function f of the screen body corresponding to the current gray scale g under each reference brightness modegAverage value of (d);
f isg＝100(D(g,n)-D(g, l))/(n-l), wherein n is a target luminance value of the reference luminance pattern, and D (g, n) is luminance compensation data in the reference luminance pattern.
8. The compensation apparatus for eliminating screen brightness nonuniformity according to claim 5, wherein said brightness data is a set of actual output brightness values of all pixels in said screen, and said brightness compensation data is a set of compensation coefficients of all pixels in said screen;
the acquisition module includes:
the detection unit is used for detecting the actual input gray-scale value of each pixel point;
the determining unit is used for determining an actual gamma curve value of the screen body and determining a target input gray level value corresponding to a target brightness value of the brightness mode according to the actual gamma curve value;
a fitting unit for fitting the formula g2＝a*g1+ b, respectively fitting the actual input gray-scale value and the target input gray-scale value of each pixel point to obtain the compensation coefficients of all the pixel points, wherein g is2Inputting the gray scale value for the target, g1And a and b are compensation coefficients for the actual input gray-scale value of the pixel point.
9. A computer device comprising a memory, a processor and a computer program stored on the memory for execution by the processor, characterized in that the steps of the method according to any of claims 1 to 4 are implemented when the computer program is executed by the processor.
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 according to any one of claims 1 to 4.
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