CN113920917A - Display panel compensation method and compensation device - Google Patents

Display panel compensation method and compensation device Download PDF

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CN113920917A
CN113920917A CN202111219609.4A CN202111219609A CN113920917A CN 113920917 A CN113920917 A CN 113920917A CN 202111219609 A CN202111219609 A CN 202111219609A CN 113920917 A CN113920917 A CN 113920917A
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compensation
pixel
target
sub
brightness
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CN113920917B (en
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吕明
韩冲
张小宝
王洪宇
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Kunshan Govisionox Optoelectronics Co Ltd
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Kunshan Govisionox Optoelectronics 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
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • 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

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Abstract

The embodiment of the application provides a compensation method and a compensation device for a display panel, and relates to the technical field of display. Firstly, dividing an image area corresponding to an effective display area of a display panel to be compensated in a target image to obtain a compensation area with the size of a pixel level; then, determining a compensation voltage based on the pixel brightness in the compensation region; and finally, performing brightness compensation on the pixels in the compensation area by using the compensation voltage. Compared with the mode that the compensation area is divided equally (for example, 9 equal divisions) by the image area corresponding to the effective display area in the prior art, the size of the compensation area in the scheme is smaller, the compensation precision is higher, and the display brightness uniformity of the compensated display panel can be improved.

Description

Display panel compensation method and compensation device
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a compensation method and a compensation device for a display panel.
Background
The display panel may have a problem of uneven display brightness when displaying, and one important reason is caused by different data voltages for emitting light by different pixels in the display panel, so performing voltage compensation on different pixels in the display panel becomes an effective solution for improving uniformity of display brightness of the display panel. However, the inventors have found that even if voltage compensation is performed, display uniformity of the display panel still has a problem of poor effect.
Disclosure of Invention
In order to overcome the technical problems mentioned in the above technical background, embodiments of the present application provide a display panel compensation method and a display panel compensation apparatus.
In a first aspect of the present application, a display panel compensation method is provided, including:
acquiring a target image of a display panel to be compensated in a display state, wherein the target image at least comprises a display picture of an effective display area of the display panel to be compensated;
dividing image areas corresponding to effective display areas of the display panel to be compensated in the target image to obtain a plurality of compensation areas with pixel levels in size;
determining a compensation voltage based on the brightness value of the pixel in each compensation region;
and performing brightness compensation on the pixels in the corresponding compensation regions by using the compensation voltage.
In the scheme, firstly, an image area corresponding to an effective display area of a display panel to be compensated in a target image is divided to obtain a compensation area with the size of a pixel level; then, determining a compensation voltage based on the pixel brightness in the compensation region; and finally, performing brightness compensation on the pixels in the compensation area by using the compensation voltage. Compared with the mode that the compensation area is divided equally (for example, 9 equal divisions) by the image area corresponding to the effective display area in the prior art, the size of the compensation area in the scheme is smaller, the compensation precision is higher, and the display brightness uniformity of the compensated display panel can be improved.
In a possible embodiment of the present application, before the step of obtaining the target image of the to-be-compensated display panel in the display state, the method further includes performing gamma correction on the display picture of the to-be-compensated display panel to obtain a gamma correction table of the to-be-compensated display panel.
In a possible embodiment of the present application, the step of obtaining a target image of the display panel to be compensated in a display state includes:
and acquiring images of the display panel to be compensated when the display panel displays a plurality of fixed gray-scale images, and acquiring the target image.
In a possible embodiment of the present application, the step of dividing an image area corresponding to an effective display area of the display panel to be compensated in the target image to obtain a plurality of compensation areas with pixel sizes includes:
and dividing image areas corresponding to the effective display areas of the display panel to be compensated by adopting the block size in the external optical compensation to obtain a plurality of compensation areas.
In one possible embodiment of the present application, the step of determining a compensation voltage based on a brightness value of a pixel in each compensation region includes:
calculating a target brightness value and an average brightness value of pixels in each compensation area;
determining the brightness values of two adjacent target fixed gray scales meeting a preset condition with the first brightness difference value from the brightness values corresponding to the plurality of fixed gray scales on the basis of the first brightness difference value between the average brightness value of the pixels in the compensation area and the target brightness value;
acquiring target pixel data voltages respectively corresponding to the brightness values of the two adjacent target fixed gray scales, wherein each target pixel data voltage comprises a first target sub-pixel voltage, a second target sub-pixel voltage and a third target sub-pixel voltage;
determining a first sub-pixel compensation voltage, a second sub-pixel compensation voltage and a third sub-pixel compensation voltage based on the target pixel data voltage, a first brightness difference between the average brightness value and the target brightness value and a second brightness difference between brightness values of the two adjacent target fixed gray scales.
In one possible embodiment of the present application, the step of determining a compensation voltage based on a brightness value of a pixel in each compensation region further includes:
calculating a target brightness value of the compensation region according to the gamma parameter adopted in the gamma correction, the maximum brightness in the gamma correction table and the display gray scale of the target image, wherein the maximum brightness in the gamma correction table is a brightness value corresponding to a gray scale value of 255;
and obtaining the average brightness value of the compensation area according to the brightness and the number of the pixels in each compensation area.
In a possible embodiment of the present application, the step of performing brightness compensation on the pixels in the corresponding compensation regions by using the compensation voltage includes:
compensating the first sub-pixel voltage in the corresponding compensation area by using the first sub-pixel compensation voltage so as to perform brightness compensation on the first sub-pixel in the compensation area; compensating the second sub-pixel voltage in the corresponding compensation area by using the second sub-pixel compensation voltage so as to perform brightness compensation on the second sub-pixel in the compensation area; and compensating the third sub-pixel voltage in the corresponding compensation area by adopting the third sub-pixel compensation voltage so as to perform brightness compensation on the third sub-pixel in the compensation area.
In one possible embodiment of the present application, in the step of determining, from luminance values corresponding to the plurality of fixed gray scales, luminance values of two adjacent target fixed gray scales satisfying a preset condition with respect to a first luminance difference value between an average luminance value of pixels in the compensation region and a target luminance value, when the following inequality is satisfied, in the step of determining the luminance value of the two adjacent target fixed gray scales with respect to the first luminance difference value based on the first luminance difference value between the average luminance value of the pixels in the compensation region and the target luminance value
(Ln+1-Ln-1)/2≤Lavg-Ltag<(Ln+2-Ln)/2
Determination of LnAnd Ln+1Fixing the intensity values of the gray levels for adjacent targets, wherein LavgIs an average luminance value, LtagIs a target brightness value, Ln-1The brightness value, L, corresponding to the (n-1) th fixed gray scalenBrightness corresponding to the nth fixed gray scaleValue, Ln+1The brightness value, L, corresponding to the (n +1) th fixed gray scalen+2The brightness value corresponding to the (n + 2) th fixed gray scale is shown, and n is a positive integer greater than or equal to 2.
In one possible embodiment of the present application, in the step of determining a first sub-pixel compensation voltage, a second sub-pixel compensation voltage, and a third sub-pixel compensation voltage based on a target pixel data voltage, a first luminance difference value between an average luminance value and a target luminance value, and a second luminance difference value between luminance values of two adjacent target fixed grayscales, the first sub-pixel compensation voltage, the second sub-pixel compensation voltage, and the third sub-pixel compensation voltage are determined using the following formulas,
Figure BDA0003312070070000041
Figure BDA0003312070070000042
Figure BDA0003312070070000043
wherein R isdata(n)*、Gdata(n)*、Bdata(n) are the first sub-pixel compensation voltage, the second sub-pixel compensation voltage and the third sub-pixel compensation voltage, Rdata(n+1)、Rdata(n)、Gdata(n+1)、Gdata(n)、Bdata(n +1) and Bdata(n) the luminance of the pixel is a luminance value Ln+1And LnThe data voltage of the first target sub-pixel, the data voltage of the second target sub-pixel and the data voltage of the third target sub-pixel corresponding to the data voltage of the time target pixel, LavgIs an average luminance value, LtagThe target brightness value is K, the compensation coefficient is K, and the value range of K is 0-2.
In a second aspect of the present application, there is also provided a display panel compensation apparatus, the apparatus including:
the device comprises an acquisition module, a compensation module and a display module, wherein the acquisition module is used for acquiring a target image of a display panel to be compensated in a display state, and the target image at least comprises a display picture of an effective display area of the display panel to be compensated;
the dividing module is used for dividing an image area corresponding to an effective display area of the display panel to be compensated in the target image to obtain a plurality of compensation areas with the size of a pixel level;
a determining module, configured to determine a compensation voltage based on a brightness value of a pixel in each compensation region;
and the compensation module is used for performing brightness compensation on the pixels in the corresponding compensation area by adopting the compensation voltage.
In a third aspect of the present application, an electronic device is further provided, where the electronic device includes a processor, a computer-readable storage medium, and an image capturing device, where the computer-readable storage medium, the image capturing device, and the processor are connected, the image capturing device is configured to capture an acquired image, the computer-readable storage medium is configured to store a program, an instruction, or a code, and the processor is configured to execute the program, the instruction, or the code in the computer-readable storage medium to perform the display panel compensation method according to the first aspect.
In a fourth aspect of the present application, there is also provided a computer-readable storage medium, in which instructions are stored, and when executed, the instructions cause a computer to execute the display panel compensation method in the first aspect.
Compared with the mode that the compensation area is divided equally (for example, 9 equal divisions) by the image area corresponding to the effective display area in the prior art, the size of the compensation area in the scheme is smaller, the compensation precision is higher, and the display brightness uniformity of the compensated display panel can be improved.
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In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic flowchart illustrating a display panel compensation method according to an embodiment of the present disclosure;
FIG. 2 is a schematic flowchart illustrating another display panel compensation method according to an embodiment of the present disclosure;
FIG. 3 provides a gamma correction table for an embodiment of the present application;
FIG. 4 is a flowchart illustrating a sub-step of step S103 in FIG. 1;
fig. 5 is a schematic functional block diagram of a display panel compensation apparatus according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram of functional modules of another compensation apparatus for a display panel according to an embodiment of the present disclosure;
fig. 7 is a schematic block structure diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. 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 application.
It should be noted that, in case of conflict, different features in the embodiments of the present application may be combined with each other.
In order to solve the technical problems mentioned in the aforementioned background art, one possible solution is as follows.
Firstly, determining an image area corresponding to an effective display area from an image comprising the effective display area of a display panel;
then, equally dividing the image area to obtain a plurality of compensation areas, for example, equally dividing the image area to obtain 9 compensation areas with the same size, wherein the size of the compensation areas is generally in centimeter level;
then, acquiring the brightness of each compensation area, and calculating the average brightness of each compensation area;
finally, a compensation voltage is calculated according to a difference between the average luminance and the target luminance of each compensation region, and the data voltage (Vdata) in the pixel driving circuit is corrected based on the compensation voltage to perform luminance compensation for each compensation region.
In the above process, the compensation area has a large size, so that the compensation accuracy is insufficient when the compensation area is compensated, and as a result, the effect of uniformity of display brightness of the display panel after compensation is not expected.
In addition, since the characteristics of devices (e.g., thin film transistors TFT or organic light emitting semiconductor OLED) in the pixel driving circuit are not uniform, there is a problem that the emission luminance of the OLE D is different even under the same gray scale and the same data voltage, and for this reason, the prior art generally adopts external optical compensation (Demura) to improve the above-mentioned emission luminance difference. In particular, the above-described display luminance unevenness due to device characteristic unevenness can be improved based on a pixel-level optical imaging technique and a software algorithm.
In order to solve the above technical problems, the inventor innovatively designs the following technical solutions, and specific implementations of the present application will be described in detail below with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a display panel compensation method according to an embodiment of the present disclosure, and the following describes steps of the display panel compensation method in detail with reference to fig. 1.
And S101, acquiring a target image of the display panel to be compensated in a display state.
In the embodiment of the present application, the target image may include at least a display screen of the effective display area of the display panel to be compensated.
Step S102, dividing image areas corresponding to effective display areas of a display panel to be compensated in a target image to obtain a plurality of compensation areas with the size of a pixel level.
In the embodiment of the present application, the size of the compensation region is at the pixel level, which means that the size of the compensation region is at the same order of magnitude as that of a single pixel, for example, the size of the pixel is at the micrometer level and the size of the compensation region is also at the micrometer level. Specifically, the compensation region may be a region determined by 1 pixel, or may also be a region determined by 2 pixels, and of course, the compensation region may also be composed of other numbers of pixels.
In step S103, a compensation voltage is determined based on the luminance values of the pixels in each compensation region.
And step S104, performing brightness compensation on the pixels in the corresponding compensation areas by using the compensation voltage.
In the embodiment of the application, firstly, an image area corresponding to an effective display area of a display panel to be compensated in a target image is divided to obtain a compensation area with the size of a pixel level; then, determining a compensation voltage based on the pixel brightness in the compensation region; and finally, performing brightness compensation on the pixels in the compensation area by using the compensation voltage. Compared with the mode that the compensation area is divided equally (for example, 9 equal divisions) by the image area corresponding to the effective display area in the prior art, the size of the compensation area in the scheme is smaller, the compensation precision is higher, and the display brightness uniformity of the compensated display panel can be improved.
Before step S101, the display panel compensation method provided in the embodiment of the present application may further include step S105.
Step S105, performing gamma correction on the display picture of the display panel to be compensated.
In this step, the display frame may be corrected by using a set Gamma parameter (for example, Gamma is 2.2), multiple spaced gray scales are selected from the gray scales of 0 to 255 as target gray scales in the correction process, the display brightness of the display panel at the target gray scales is adjusted to the ideal brightness corresponding to the Gamma parameter, then brightness values corresponding to all gray scales are obtained by calculation in an interpolation manner, and finally, a Gamma correction table as shown in fig. 3 is obtained, where the Gamma correction table at least may include color gamut coordinates corresponding to each gray scale and brightness values after Gamma correction.
In this embodiment, step S101 may be implemented by capturing an image of the compensation display panel displaying a plurality of fixed gray-scale images by an image capturing device of an external optical compensation (Demura) station, so as to obtain a target image.
The fixed gray level pattern may be a plurality of fixed gray level patterns with gray levels of 32, 64, 96, 160, 192, and 224, respectively. In the embodiment of the present application, the number of target images obtained is also plural.
In this embodiment of the application, in step S102, the image area corresponding to the effective display area of the display panel to be compensated may be divided by the block size (blocksize) in the external optical compensation, so as to obtain a plurality of compensation areas.
Different compensation areas can be obtained in a plurality of different target images through the division, so that compensation of different fixed gray-scale images can be realized by performing brightness compensation on the compensation areas in the different target images, and the display brightness uniformity of the different gray-scale images can be increased.
Referring to fig. 3, step S103 in the embodiment of the present application may include the following sub-steps.
And a substep S1031 of calculating target luminance values and average luminance values of the pixels in the respective compensation regions.
In the sub-step, a target brightness value of the compensation region is calculated according to the gamma parameter used in the gamma correction, the maximum brightness in the gamma correction table, and the display gray scale of the target image, where the maximum brightness in the gamma correction table is a brightness value corresponding to the gray scale value 255.
Specifically, the calculation formula of the target luminance value may be as follows:
Ltag＝Lmax display gray scale 255^2.2
Wherein L istagIs a target brightness value, LmaxFor the maximum luminance (e.g., 559.78827 nits in fig. 3) in the gamma correction table, 2.2 is the gamma parameter.
The calculation formula of the average luminance value may be as follows:
Figure BDA0003312070070000101
wherein L isavgIs an average luminance value, L1、L2...LMThe brightness value of each pixel point in the compensation area, and M is the number of pixels in the compensation area.
In the sub-step S1032, based on the first luminance difference between the average luminance value of the pixel in the compensation region and the target luminance value, the luminance values of two adjacent target fixed grayscales satisfying the preset condition with the first luminance difference are determined from the luminance values corresponding to the plurality of fixed grayscales.
Specifically, when the following inequality is satisfied
(Ln+1-Ln-1)/2≤Lavg-Ltag<(Ln+2-Ln)/2
Determination of LnAnd Ln+1Fixing the intensity values of the gray levels for adjacent targets, wherein Ln-1The brightness value, L, corresponding to the (n-1) th fixed gray scalenThe brightness value, L, corresponding to the nth fixed gray scalen+1The brightness value, L, corresponding to the (n +1) th fixed gray scalen+2Is the brightness value corresponding to the (n + 2) th fixed gray scale, n is a positive integer greater than or equal to 2, (L)n+1-Ln-1) (2) the average value of the luminance difference values of the adjacent fixed gray levels between the (n +1) th fixed gray level and the (n-1) th fixed gray level, (L)n+2-Ln) And/2 represents an average value of luminance difference values of adjacent fixed gray levels between the (n + 2) th fixed gray level and the nth fixed gray level.
And a substep S1033 of obtaining target pixel data voltages corresponding to the luminance values of the two adjacent target fixed gray scales, respectively.
Each target pixel data voltage includes a first target subpixel voltage, a second target subpixel voltage, and a third target subpixel voltage. For example, in an RGB image, the target pixel data voltage VdataMay include a first target subpixel voltage RdataA second target sub-pixel voltage GdataAnd a third target sub-pixel voltage Bdata。
Specifically, after gamma correction is performed on the display panel to be compensated, the data voltage corresponding to the sub-pixel of each pixel at a fixed gray level is stored in a register of the electronic device located at the external optical compensation site. When the corresponding fixed gray scale needs to be displayed, the driving chip of the display panel can obtain the corresponding data voltage from the register of the electronic device, and the corresponding sub-pixel is driven to emit light by adopting the corresponding data voltage.
In sub-step S1034, a first sub-pixel compensation voltage, a second sub-pixel compensation voltage, and a third sub-pixel compensation voltage are determined based on the target pixel data voltage, a first luminance difference between the average luminance value and the target luminance value, and a second luminance difference between luminance values of two adjacent target fixed grayscales.
In the embodiment of the present application, the following formulas may be used to determine a sub-pixel compensation voltage, a second sub-pixel compensation voltage, and a third sub-pixel compensation voltage.
Figure BDA0003312070070000111
Figure BDA0003312070070000121
Figure BDA0003312070070000122
Wherein R isdata(n)*、Gdata(n)*、Bdata(n) are the first sub-pixel compensation voltage and the second sub-pixel compensation voltage respectivelyAnd a third sub-pixel compensation voltage, Rdata(n+1)、Rdata(n)、Gdata(n+1)、Gdata(n)、Bdata(n +1) and Bdata(n) the luminance of the pixel is a luminance value Ln+1And LnAnd the data voltage of the first target sub-pixel, the data voltage of the second target sub-pixel and the data voltage of the third target sub-pixel corresponding to the data voltage of the target pixel, wherein K is a compensation coefficient, and the value range of K is between 0 and 2.
In the embodiment of the present application, step S104 can also be implemented in the following manner.
Firstly, compensating the first sub-pixel voltage in the corresponding compensation area by adopting the first sub-pixel compensation voltage so as to perform brightness compensation on the first sub-pixel in the compensation area;
then, compensating the second sub-pixel voltage in the corresponding compensation area by adopting the second sub-pixel compensation voltage so as to perform brightness compensation on the second sub-pixel in the compensation area;
and finally, compensating the third sub-pixel voltage in the corresponding compensation area by adopting a third sub-pixel compensation voltage so as to perform brightness compensation on the third sub-pixel in the compensation area.
In the technical scheme provided by the embodiment of the application, firstly, an image shooting device of an external optical compensation station is adopted to shoot an image displaying a fixed gray scale image to obtain a target image; then, dividing the target image by adopting the block size in the external optical compensation to obtain a plurality of compensation areas; then, calculating to obtain a compensation voltage based on the average brightness and the target brightness in the compensation area; and finally, performing brightness compensation on each compensation area by adopting the compensation voltage. In the technical scheme, on one hand, the brightness compensation can be performed on the compensation area of each pixel level, the compensation precision is higher, and the display brightness uniformity of the display panel can be improved; on the other hand, the brightness compensation can be carried out on the target images with different fixed gray scales, and the display brightness uniformity of the images with different fixed gray scales can be improved. On the other hand, the brightness compensation based on the voltage drop is integrated in an external optical compensation site, software algorithms related to the two compensations can be integrated together, the two compensations are simultaneously carried out in a one-key control mode, and the efficiency of the brightness compensation is improved.
Fig. 5 is a schematic diagram of functional modules of the display panel compensation apparatus 200 provided in this embodiment, and this embodiment may divide the display panel compensation apparatus 200 into functional modules according to the above display panel compensation method embodiment, that is, the following functional modules corresponding to the display panel compensation apparatus 200 may be used to execute the above display panel compensation method. The display panel compensation apparatus 200 may include an obtaining module 210, a dividing module 220, a determining module 230, and a compensating module 240, and the functions of the functional modules of the display panel compensation apparatus 200 are described in detail below.
The obtaining module 210 is configured to obtain a target image of the display panel to be compensated in a display state, where the target image at least includes a display frame of an effective display area of the display panel to be compensated.
The dividing module 220 is configured to divide an image area corresponding to an effective display area of a display panel to be compensated in a target image to obtain a plurality of compensation areas with pixel sizes.
And a determining module 230, configured to determine the compensation voltage based on the brightness value of the pixel in each compensation region.
And a compensation module 240 for performing brightness compensation on the pixels in the corresponding compensation region using the compensation voltage.
Referring to fig. 6, the display panel compensation apparatus 200 according to the embodiment of the present application may further include a correction module 250, where before the obtaining module 210 obtains the target image of the display panel to be compensated in the display state, the correction module 250 is configured to perform gamma correction on the display picture of the display panel to be compensated, so as to obtain a gamma correction table of the display panel to be compensated.
Specifically, the correction module 250 may correct the display image by using a set Gamma parameter (for example, Gamma is 2.2), select a plurality of spaced gray scales from the gray scales of 0 to 255 as a target gray scale in the correction process, adjust the display brightness of the display panel at the target gray scale to an ideal brightness corresponding to the Gamma parameter, then calculate brightness values corresponding to all gray scales by means of interpolation, and finally obtain a Gamma correction table as shown in fig. 2, where the Gamma correction table may at least include color gamut coordinates corresponding to each gray scale and brightness values under the Gamma parameter.
In this embodiment of the application, the obtaining module 210 may be specifically configured to obtain a target image by capturing, by an image capturing device of an external optical compensation station, an image of a display panel to be compensated when the display panel displays a plurality of fixed gray-scale images.
The fixed gray level pattern may be a plurality of fixed gray level patterns with gray levels of 32, 64, 96, 160, 192, and 224, respectively. In the embodiment of the present application, the obtained target image is also a plurality of images.
In this embodiment of the application, the dividing module 220 may be specifically configured to divide an image area corresponding to an effective display area of a display panel to be compensated by using a block size (blocksize) in the external optical compensation, so as to obtain a plurality of compensation areas.
Different compensation areas can be obtained in a plurality of different target images through the division, so that compensation of different fixed gray-scale images can be realized by performing brightness compensation on the compensation areas in the different target images, and the uniformity of display brightness of different gray scales can be increased.
In this embodiment, the determining module 230 may be specifically configured to:
calculating a target brightness value and an average brightness value of pixels in each compensation area;
determining the brightness values of two adjacent target fixed gray scales meeting a preset condition with the first brightness difference value from the brightness values corresponding to the plurality of fixed gray scales on the basis of the first brightness difference value between the average brightness value of the pixels in the compensation area and the target brightness value;
obtaining target pixel data voltages respectively corresponding to brightness values of two adjacent target fixed gray scales, wherein each target pixel data voltage comprises a first target sub-pixel voltage, a second target sub-pixel voltage and a third target sub-pixel voltage; and
and determining a first sub-pixel compensation voltage, a second sub-pixel compensation voltage and a third sub-pixel compensation voltage based on the target pixel data voltage, a first brightness difference value between the average brightness value and the target brightness value and a second brightness difference value between the brightness values of the two adjacent target fixed gray scales.
Further, the determining module 230 may calculate the target brightness value and the average brightness value of the pixels in each of the compensation regions in the following manner.
And calculating to obtain a target brightness value of the compensation region according to the gamma parameter adopted in the gamma correction, the maximum brightness in the gamma correction table and the display gray scale of the target image, wherein the maximum brightness in the gamma correction table is a brightness value corresponding to the gray scale value 255.
Specifically, the calculation formula of the target luminance value may be as follows:
Ltag＝Lmax display gray scale 255^2.2
Wherein L istagIs a target brightness value, LmaxFor the maximum luminance in the gamma correction table (e.g., 559.78827 nits in table 1), 2.2 is the gamma parameter.
The calculation formula of the average luminance value may be as follows:
Figure BDA0003312070070000151
wherein L isavgIs an average luminance value, L1、L2...LMThe brightness value of each pixel point in the compensation area, and M is the number of pixels in the compensation area.
Further, the determining module 230 may also determine the brightness values of two adjacent target fixed gray levels in the following manner.
Specifically, when the following inequality is satisfied
(Ln+1-Ln-1)/2≤Lavg-Ltag<(Ln+2-Ln)/2
Determination of LnAnd Ln+1Fixing the intensity values of the gray levels for adjacent targets, wherein Ln-1The brightness value, L, corresponding to the (n-1) th fixed gray scalenThe brightness value, L, corresponding to the nth fixed gray scalen+1The brightness value, L, corresponding to the (n +1) th fixed gray scalen+2The brightness value corresponding to the (n + 2) th fixed gray scale is shown, and n is a positive integer greater than or equal to 2.
Further, the determining module 230 may also determine the first sub-pixel compensation voltage, the second sub-pixel compensation voltage and the third sub-pixel compensation voltage in the following manner.
Figure BDA0003312070070000161
Figure BDA0003312070070000162
Figure BDA0003312070070000163
Wherein R isdata(n)*、Gdata(n)*、Bdata(n) are the first sub-pixel compensation voltage, the second sub-pixel compensation voltage and the third sub-pixel compensation voltage, Rdata(n+1)、Rdata(n)、Gdata(n+1)、Gdata(n)、Bdata(n +1) and Bdata(n) the luminance of the pixel is a luminance value Ln+1And LnThe data voltage of the first target sub-pixel, the data voltage of the second target sub-pixel and the data voltage of the third target sub-pixel corresponding to the data voltage of the time target pixel, LavgIs an average luminance value, LtagThe target brightness value is K, the compensation coefficient is K, and the value range of K is 0-2.
In this embodiment of the present application, the compensation module 240 may be further specifically configured to:
compensating the first sub-pixel voltage in the corresponding compensation area by using the first sub-pixel compensation voltage so as to perform brightness compensation on the first sub-pixel in the compensation area; compensating the second sub-pixel voltage in the corresponding compensation area by using the second sub-pixel compensation voltage so as to perform brightness compensation on the second sub-pixel in the compensation area; and compensating the third sub-pixel voltage in the corresponding compensation area by adopting the third sub-pixel compensation voltage so as to perform brightness compensation on the third sub-pixel in the compensation area.
Referring to fig. 7, fig. 7 is a schematic structural diagram of an electronic device 10 according to an embodiment of the present disclosure. The electronic device 10 may be configured as an external optical compensation site, and the electronic device 10 may include a computer-readable storage medium 110, a processor 120, and an image capture device 130, which are electrically connected directly or indirectly between the computer-readable storage medium 110, the processor 120, and the image capture device 130 to enable data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The computer readable storage medium 110 can be used to store software programs and modules, such as the software programs provided in the embodiments of the present application for implementing the display panel compensation method, for example, the display panel compensation apparatus 200 shown in the figure. The processor 120 executes the corresponding various functional applications and performs corresponding data processing by executing the display panel compensation apparatus 200 stored in the computer-readable storage medium 110. The image capturing device 130 may be integrated with the electronic device 10 or may be independent from the electronic device 10 for capturing the target image.
The computer-readable storage medium 110 may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), and the like.
The processor 120 may be an integrated circuit chip having signal processing capabilities. The processor 120 may be a general-purpose processor, including a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components.
It will be appreciated that the configuration shown in FIG. 7 is merely illustrative and that electronic device 10 may include more or fewer components than shown in FIG. 7, for example, electronic device 10 may include a display screen or have a different configuration than shown in FIG. 7.
The embodiment of the application provides a display panel compensation method and device. Shooting an image displaying a fixed gray scale image by adopting image shooting equipment of an external optical compensation station to obtain a target image; dividing a target image by adopting a block size in external optical compensation to obtain a plurality of compensation areas; calculating to obtain a compensation voltage based on the average brightness and the target brightness in the compensation area; and performing brightness compensation on each compensation area by using the compensation voltage. In the technical scheme, on one hand, the brightness compensation can be performed on the compensation area of each pixel level, the compensation precision is higher, and the display brightness uniformity of the display panel can be improved; on the other hand, the brightness compensation can be carried out on the target images with different fixed gray scales, and the display brightness uniformity of the images with different fixed gray scales can be improved. In addition, the brightness compensation based on the voltage drop is integrated in an external optical compensation site, software algorithms related to the two compensations can be integrated together, the two compensations are simultaneously carried out in a one-key control mode, and the efficiency of the brightness compensation is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A display panel compensation method, comprising:
acquiring a target image of a display panel to be compensated in a display state, wherein the target image at least comprises a display picture of an effective display area of the display panel to be compensated;
dividing image areas corresponding to effective display areas of the display panel to be compensated in the target image to obtain a plurality of compensation areas with pixel levels in size;
determining a compensation voltage based on the brightness value of the pixel in each compensation region;
and performing brightness compensation on the pixels in the corresponding compensation regions by using the compensation voltage.
2. The method as claimed in claim 1, wherein before the step of obtaining the target image of the display panel to be compensated in the display state, the method further comprises performing gamma correction on the display image of the display panel to be compensated to obtain a gamma correction table of the display panel to be compensated.
3. The display panel compensation method of claim 2, wherein the step of obtaining the target image of the display panel to be compensated in the display state comprises:
and acquiring images of the display panel to be compensated when the display panel displays a plurality of fixed gray-scale images, and acquiring the target image.
4. The display panel compensation method of claim 1, wherein the step of dividing the image area corresponding to the effective display area of the display panel to be compensated in the target image to obtain a plurality of compensation areas with pixel size comprises:
and dividing image areas corresponding to the effective display areas of the display panel to be compensated by adopting the block size in the external optical compensation to obtain a plurality of compensation areas.
5. The display panel compensation method of claim 3, wherein the step of determining the compensation voltage based on the luminance values of the pixels in each of the compensation regions comprises:
calculating a target brightness value and an average brightness value of pixels in each compensation area;
determining the brightness values of two adjacent target fixed gray scales meeting a preset condition with the first brightness difference value from the brightness values corresponding to the plurality of fixed gray scales on the basis of the first brightness difference value between the average brightness value of the pixels in the compensation area and the target brightness value;
acquiring target pixel data voltages respectively corresponding to the brightness values of the two adjacent target fixed gray scales, wherein each target pixel data voltage comprises a first target sub-pixel voltage, a second target sub-pixel voltage and a third target sub-pixel voltage;
determining a first sub-pixel compensation voltage, a second sub-pixel compensation voltage and a third sub-pixel compensation voltage based on the target pixel data voltage, a first brightness difference between the average brightness value and the target brightness value and a second brightness difference between brightness values of the two adjacent target fixed gray scales.
6. The display panel compensation method of claim 5, wherein the step of determining a compensation voltage based on the luminance values of the pixels in each of the compensation regions further comprises:
calculating a target brightness value of the compensation region according to the gamma parameter adopted in the gamma correction, the maximum brightness in the gamma correction table and the display gray scale of the target image, wherein the maximum brightness in the gamma correction table is a brightness value corresponding to a gray scale value of 255;
and obtaining the average brightness value of the compensation area according to the brightness and the number of the pixels in each compensation area.
7. The display panel compensation method of claim 5, wherein the step of performing the brightness compensation on the pixels in the corresponding compensation regions using the compensation voltage comprises:
compensating the first sub-pixel voltage in the corresponding compensation area by using the first sub-pixel compensation voltage so as to perform brightness compensation on the first sub-pixel in the compensation area; compensating the second sub-pixel voltage in the corresponding compensation area by using the second sub-pixel compensation voltage so as to perform brightness compensation on the second sub-pixel in the compensation area; and compensating the third sub-pixel voltage in the corresponding compensation area by adopting the third sub-pixel compensation voltage so as to perform brightness compensation on the third sub-pixel in the compensation area.
8. The method as claimed in claim 5, wherein in the step of determining the luminance values of two adjacent target fixed grayscales satisfying a predetermined condition from the luminance values corresponding to the first luminance difference value among the plurality of fixed grayscales based on the first luminance difference value between the average luminance value of the pixels in the compensation region and the target luminance value, the following inequality is satisfied
(Ln+1-Ln-1)/2≤Lavg-Ltag<(Ln+2-Ln)/2
Determination of LnAnd Ln+1Fixing the intensity values of the gray levels for adjacent targets, wherein LavgIs an average luminance value, LtagIs a target brightness value, Ln-1The brightness value, L, corresponding to the (n-1) th fixed gray scalenThe brightness value, L, corresponding to the nth fixed gray scalen+1The brightness value, L, corresponding to the (n +1) th fixed gray scalen+2Is the brightness value corresponding to the (n + 2) th fixed gray scale, and n is a positive integer greater than or equal to 2.
9. The display panel compensation method of claim 8, wherein in the step of determining a first sub-pixel compensation voltage, a second sub-pixel compensation voltage, and a third sub-pixel compensation voltage based on the target pixel data voltage, a first luminance difference value between an average luminance value and a target luminance value, and a second luminance difference value between luminance values of two adjacent target fixed grayscales, the first sub-pixel compensation voltage, the second sub-pixel compensation voltage, and the third sub-pixel compensation voltage are determined using the following formulas,
Figure FDA0003312070060000031
Figure FDA0003312070060000032
Figure FDA0003312070060000041
wherein R isdata(n)*、Gdata(n)*、Bdata(n) are the first sub-pixel compensation voltage, the second sub-pixel compensation voltage and the third sub-pixel compensation voltage, Rdata(n+1)、Rdata(n)、Gdata(n+1)、Gdata(n)、Bdata(n +1) and Bdata(n) the luminance of the pixel is a luminance value Ln+1And LnThe data voltage of the first target sub-pixel, the data voltage of the second target sub-pixel and the data voltage of the third target sub-pixel corresponding to the data voltage of the time target pixel, LavgIs an average luminance value, LtagThe target brightness value is K, the compensation coefficient is K, and the value range of K is 0-2.
10. A display panel compensation apparatus, comprising:
the device comprises an acquisition module, a compensation module and a display module, wherein the acquisition module is used for acquiring a target image of a display panel to be compensated in a display state, and the target image at least comprises a display picture of an effective display area of the display panel to be compensated;
the dividing module is used for dividing an image area corresponding to an effective display area of the display panel to be compensated in the target image to obtain a plurality of compensation areas with the size of a pixel level;
a determining module, configured to determine a compensation voltage based on a brightness value of a pixel in each compensation region;
and the compensation module is used for performing brightness compensation on the pixels in the corresponding compensation area by adopting the compensation voltage.
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