CN107068037A - Gray scale correction method and gray scale correction device of display panel - Google Patents
Gray scale correction method and gray scale correction device of display panel Download PDFInfo
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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
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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Abstract
The application discloses a gray scale correction method and device of a display panel, wherein the method comprises the following steps: appointing a plurality of test gray scales and a reference gray scale, detecting the actual brightness of each pixel when each test gray scale and reference gray scale are input into the display panel, and calculating the average brightness of the test gray scales and the average brightness of the reference gray scale of the display panel; determining a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale; dividing the full gray scale into n gray scale areas, and determining a second gamma value corresponding to the ith gray scale area according to a first gamma value corresponding to each test gray scale located in the ith gray scale area; and determining the corrected relative brightness of the pixel under any gray scale according to the actual brightness of any pixel under the maximum gray scale and the second gamma value corresponding to each gray scale area. The method realizes that the pixels in different gray scale areas are respectively corrected by adopting different second gamma values, and improves the display quality of the display panel.
Description
Technical Field
The present disclosure relates to the field of display technologies, and in particular, to a gray scale correction method and a gray scale correction apparatus for a display panel.
Background
The display technology is a crucial technology in electronic technology, and is related to the display effect of electronic products. And with the rapid development of display technology, people have higher and higher requirements on display effects.
The display panel may generally include a liquid crystal display panel and an organic light emitting display panel. In order to solve the problem of display unevenness of the display panel, the driving chip and the like can correct gray scales of each pixel on the display panel. However, the conventional gray scale correction method usually adopts a single gamma curve with a relatively fixed gamma coefficient to correct each pixel in different gray scales in the whole display panel, so that the corrected display panel has poor accuracy in image display and low display quality.
Disclosure of Invention
In view of the above-mentioned drawbacks of the prior art, embodiments of the present application provide a method and an apparatus for gray scale correction of a display panel to solve the above-mentioned problems.
In order to achieve the above object, in a first aspect, an embodiment of the present application provides a gray-scale correction method for a display panel, including: appointing a plurality of test gray scales, detecting the actual brightness of each pixel when each test gray scale is input into the display panel, and calculating the average brightness of the test gray scale of each pixel when the display panel inputs the corresponding test gray scale; appointing a reference gray scale, detecting the actual brightness of each pixel when the reference gray scale is input to the display panel, and calculating the average brightness of the reference gray scale of each pixel when the reference gray scale is input to the display panel; determining a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale; dividing a full gray scale into n gray scale regions, and determining a second gamma value corresponding to the ith gray scale region according to a first gamma value corresponding to each test gray scale located in the ith gray scale region, wherein n is a preset positive integer, i is more than or equal to 1 and less than or equal to n, and i is a positive integer; and determining the corrected relative brightness of the pixel under any gray scale according to the actual brightness of any pixel under the maximum gray scale and the second gamma value corresponding to each gray scale area.
In a second aspect, an embodiment of the present application further provides a gray-scale correction device for a display panel, including: the test gray scale average brightness determining unit is configured to designate a plurality of test gray scales, detect the actual brightness of each pixel when each test gray scale is input into the display panel, and calculate the test gray scale average brightness of each pixel when the display panel inputs the corresponding test gray scale; the reference gray scale average brightness determining unit is configured to designate a reference gray scale, detect the actual brightness of each pixel when the reference gray scale is input to the display panel, and calculate the reference gray scale average brightness of each pixel when the reference gray scale is input to the display panel; the first gamma value determining unit is configured to determine a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale; the second gamma value determining unit is configured to divide a full gray scale into n gray scale regions, and determine a second gamma value corresponding to the ith gray scale region according to a first gamma value corresponding to each test gray scale located in the ith gray scale region, wherein n is a preset positive integer, i is greater than or equal to 1 and less than or equal to n, and i is a positive integer; and the corrected relative brightness determining unit is configured to determine the corrected relative brightness of the pixel at any gray scale according to the actual brightness of any pixel at the maximum gray scale and the second gamma value corresponding to each gray scale area.
The gray scale correction method of the display panel provided by the embodiment of the application can specify a plurality of test gray scales and a reference gray scale in the full gray scale, detect the actual brightness of each pixel under each test gray scale and reference gray scale, correspondingly calculate the average brightness of each test gray scale and the average brightness of the reference gray scale, determine the first gamma value corresponding to each test gray scale according to the average brightness of the test gray scale and the average brightness of the reference gray scale, divide the full gray scale into n gray scale regions, determine the second gamma value corresponding to the gray scale region according to the first gamma value corresponding to each test gray scale in the ith gray scale region, and determine the corrected relative brightness of each pixel under any gray scale according to the actual brightness of any pixel under the maximum gray scale and the second gamma value corresponding to each gray scale region, thereby realizing that each pixel under different gray scale regions is respectively corrected by adopting different gamma curves of the second gamma values, the display accuracy of the display panel is improved.
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Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
FIG. 1 is a diagram illustrating an exemplary structure of a display panel to which a gray scale correction method of a display surface or a gray scale correction apparatus of a display panel of the present application can be applied;
FIG. 2 is a flow chart illustrating one embodiment of a gray scale correction method for a display panel according to the present application;
FIG. 3 shows a flow diagram of another embodiment of a correction method for a display panel according to the present application;
FIG. 4 is a schematic diagram illustrating an embodiment of a gray-scale correction device for a display panel according to the present application.
Detailed Description
The principles and features of the present application are described in further detail below with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Fig. 1 shows an exemplary structure 100 of one embodiment of a display panel to which the gray scale correction method of the display surface or the gray scale correction apparatus of the display panel of the present application can be applied.
As shown in fig. 1, the display panel 100 may include a plurality of data lines 101, a plurality of scan lines 102, a driving chip 103, and a plurality of pixels 104. The data lines 101 and the scan lines 102 are arranged to intersect with each other to form a plurality of pixel units, each pixel 104 is arranged in each corresponding pixel unit, the scan lines 102 supply scan signals to the pixels 104, and the data lines 101 supply data signals to the pixels 104. It should be noted that the display panel 100 may further include a data line driving circuit and a scan line driving circuit, as shown in fig. 1, and the data line driving circuit and the scan line driving circuit may be electrically connected to the driving chip 103. Each data line 101 may be electrically connected to a data line driving circuit, and each scan line 102 may be electrically connected to a scan line driving circuit. The driving chip 103 may output a data signal to each pixel 104 via the data line driving circuit and each data line 101 to drive each pixel 104 in the display panel 100 for display.
The display panel 100 may be a liquid crystal display panel or an organic light emitting display panel, and the gray scale correction method of the display panel provided by the embodiment of the present application may be generally executed by an external computer or the like, calculate the corrected relative brightness of each pixel 104 in the display panel 100 at each gray scale, and input the calculation result into the driving chip 103 of the display panel 100, so that the driving chip 103 may perform gray scale correction on each pixel 104. Accordingly, the gradation correction device of the display panel may be generally provided in an externally provided computer, and is not limited thereto.
It should be noted that, if the driving chip 103 in the display panel has enough memory, the gray scale correction method for the display panel provided in the embodiment of the present application can also be executed by the driving chip 103, and the corrected relative brightness of each pixel 104 in the display panel 100 at each gray scale is calculated, so as to complete the correction of the gray scale of each pixel 104 in the display panel 100. Accordingly, the gradation correction device of the display panel may also be provided in the driving chip 103. It should be understood that the gray scale correction method of the display panel provided in the embodiment of the present application may also be performed by a gamma voltage chip separately provided, and accordingly, the gray scale correction device of the display panel may also be provided in the gamma voltage chip, which is not limited herein.
With continued reference to FIG. 2, a flowchart 200 of one embodiment of a method for gray scale correction of a display panel according to the present application is shown. The gray scale correction method of the display panel of the embodiment may include the following steps:
step 201, appointing a plurality of test gray scales, detecting the actual brightness of each pixel when the display panel inputs each test gray scale, and calculating the average brightness of the test gray scale of each pixel when the display panel inputs the corresponding test gray scale.
In this embodiment, the gray scale correction method of the display panel may be implemented on a chip (e.g., the driving chip shown in fig. 1) in the display panel or an external computer or the like. The display panel can be an 8-bit display panel, a 10-bit display panel, and the like, and the full gray scale that can be displayed by the corresponding display panel can include different gray scales, for example, the display panel is an 8-bit display panel, the full gray scale that can be displayed by the display panel is 0-255 gray scale, the display panel is a 10-bit display panel, and the full gray scale that can be displayed by the display panel is 0-1023 gray scale. The chip can designate a plurality of gray scales as test gray scales in the full gray scale of the display panel. Then, the chip can input each test gray scale to each pixel of the display panel through the data line driving circuit and the data line as shown in fig. 1, and the actual brightness of each pixel when each test gray scale is input to the display panel is detected by a brightness obtaining device such as a CCD. And finally, calculating the average brightness of each pixel in the display panel when each test gray scale is input into the display panel, thereby determining the average brightness of the test gray scale of the display panel under each test gray scale.
Here, taking an 8-bit display panel as an example, the full gray scale of the display panel is 0 to 255, the designated test gray scales may be 5, 20, 35, 50, 65 … … 230, 245, the actual brightness of each pixel of the display panel under each test gray scale may be detected by a brightness obtaining device such as a CCD, and then the average brightness of each test gray scale may be calculated according to the actual brightness of each pixel in the display panel under each test gray scale, and the average brightness of the corresponding test gray scale may be 0 to 255
Step 202, designating a reference gray scale, detecting the actual brightness of each pixel when the reference gray scale is input to the display panel, and calculating the average brightness of the reference gray scale of each pixel when the reference gray scale is input to the display panel.
In this embodiment, one gray level may be continuously assigned as the reference gray level among the full gray levels of the display panel. Then, the reference gray scale may be input to each pixel of the display panel, and the actual brightness of each pixel when the reference gray scale is input to the display panel may be detected by a brightness obtaining device such as a CCD. And finally, calculating the average brightness of each pixel in the display panel when the reference gray scale is input into the display panel, thereby determining the average brightness of the reference gray scale of the display panel under the reference gray scale.
Here, taking an 8-bit display panel as an example, the full gray scale of the display panel is 0 to 255, the designated test gray scale may be 255, the actual brightness of each pixel of the display panel at 255 gray scales is detected by a brightness obtaining device such as a CCD, and then the average brightness of the reference gray scale is calculated according to the actual brightness of each pixel of the display panel at 255 gray scales
Step 203, determining a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale.
In this embodiment, based on the average brightness of the test gray scale of the display panel at each test gray scale calculated in step 201 and the average brightness of the reference gray scale of the display panel at the reference gray scale calculated in step 202, the first gamma value corresponding to each test gray scale can be determined according to the average brightness of the test gray scale of the display panel at each test gray scale with the average brightness of the reference gray scale of the display panel at the reference gray scale as a reference.
Step 204, dividing the full gray scale into n gray scale regions, and determining a second gamma value corresponding to the ith gray scale region according to the first gamma value corresponding to each test gray scale located in the ith gray scale region.
In this embodiment, the full gray scale of the display panel may be sequentially divided into n gray scale regions, each of the ith gray scale regions may include a plurality of gray scales, where n may be a preset positive integer, i satisfies 1 ≦ i ≦ n, and i is a positive integer. And then, determining the test gray scale in the ith gray scale area according to each gray scale in the ith gray scale area, and acquiring a first gamma value corresponding to each test gray scale in the ith gray scale area. Finally, the second gamma value corresponding to the ith gray scale region can be determined by various means according to the first gamma value corresponding to each test gray scale in the ith gray scale region.
Here, still taking the 8-bit display panel as an example, the full gray scale of the display panel from 0 to 255 may be divided into 5 gray scale regions, where n is 5, the first gray scale region may include from 0 to 35 gray scales, the 2 nd gray scale region may include from 36 to 95 gray scales, the 3 rd gray scale region may include from 96 to 155 gray scales, the 4 th gray scale region may include from 156 to 230 gray scales, and the 5 th gray scale region may include from 231 to 255 gray scales. Taking the first gray scale region as an example, that is, i is 1, it may be determined that the first gray scale region may include the test gray scales 5, 20, and 35, then the first gamma values corresponding to the test gray scales 5, 20, and 35 included in the gray scale region may be obtained based on step 203, and finally the second gamma value corresponding to the first gray scale region may be determined according to the first gamma values corresponding to the test gray scales 5, 20, and 35.
It is understood that the first to nth gray scale regions may include at least one test gray scale, so that any one gray scale region may determine a second gamma value corresponding to the gray scale region according to a first gamma value corresponding to the test gray scale located in the gray scale region.
Step 205, determining the corrected relative brightness of any pixel at any gray level according to the actual brightness of the pixel at the maximum gray level and the second gamma value corresponding to each gray level region.
In this embodiment, for any pixel in the display panel, the actual brightness of the pixel at the maximum gray scale may be first obtained by a brightness obtaining device such as a CCD. Then, for a certain gray scale, the gray scale region where the gray scale is located is determined, and a second gamma value corresponding to the gray scale region where the gray scale is located is obtained based on step 204. And finally, by taking the actual brightness of the pixel under the maximum gray scale as a reference, determining the corrected relative brightness of the pixel under the gray scale according to the acquired second gamma value. Therefore, the corrected relative brightness of each pixel in the display panel under any one of the full gray scales can be determined by adopting the method. The corrected relative brightness table of the display panel can be generated according to the corrected relative brightness of each pixel in the display panel under each gray scale. The driving chip in the display panel and the like can perform gray scale correction on each pixel in the display panel according to the correction brightness table.
Here, continuing with the 8-bit display panel as an example, after the actual brightness of the pixel under the 255 gray scales is obtained by the brightness obtaining device for any pixel in the display panel, the gray scales included in the first to 5 th gray scale regions and the second gamma value corresponding to each gray scale region may be obtained based on step 205, and then the corrected relative brightness of the pixel under the 0-255 gray scales may be determined according to the actual brightness of the pixel under the 255 gray scales and the second gamma value corresponding to each gray scale region. Based on the method, the corrected relative brightness of each pixel in the display panel under the gray scales of 0-255 can be calculated, and the corrected relative brightness table of the display panel is generated.
In the gray scale correction method for the display panel provided by the above embodiment of the application, by designating a plurality of test gray scales and a reference gray scale in the full gray scale, detecting the actual brightness of each pixel under each test gray scale and reference gray scale, correspondingly calculating the average brightness of each test gray scale and the average brightness of the reference gray scale, then determining the first gamma value corresponding to each test gray scale according to the average brightness of the test gray scale and the average brightness of the reference gray scale, then dividing the full gray scale into n gray scale regions, determining the second gamma value corresponding to the gray scale region according to the first gamma value corresponding to each test gray scale located in the ith gray scale region, and finally determining the corrected relative brightness of any pixel under any gray scale according to the actual brightness of any pixel under the maximum gray scale and the second gamma value corresponding to each gray scale region, thereby realizing that each pixel located in different gray scale regions is respectively corrected by adopting the gamma curves with different second gamma values, the display accuracy of the display panel is improved.
Referring next to fig. 3, shown is a flow diagram 300 of another embodiment of a method for correcting a display panel according to the present application. The correction method of the display panel of the embodiment may include the following steps:
step 301, designating a plurality of test gray scales, detecting the actual brightness of each pixel when the display panel inputs each test gray scale, and calculating the average brightness of the test gray scale of each pixel when the display panel inputs the corresponding test gray scale.
In this embodiment, first, a plurality of gray levels can be designated as test gray levels from the full gray levels of the display panel, and x is a gray level value of any test gray level. Then, each test gray scale can be input into the display panel, and the actual brightness of each pixel when each test gray scale is input into the display panel can be detected by a brightness acquisition device such as a CCD. Finally, the driving chip in the display panel or an externally disposed computer or the like may calculate the average luminance of the display panel at each test gray level as the test gray level average luminance based on the detected actual luminance of each pixel at each test gray level.
Step 302, designating a reference gray scale, detecting the actual brightness of each pixel when the reference gray scale is input to the display panel, and calculating the average brightness of the reference gray scale of each pixel when the reference gray scale is input to the display panel.
In this embodiment, a reference gray scale may be designated from the full gray scale of the display panel, then the actual brightness of each pixel in the display panel after the reference gray scale is input is detected by a brightness obtaining device such as a CCD, and finally the average brightness of the display panel is calculated as the average brightness of the reference gray scale according to the actual brightness of the display panel at the reference gray scale.
In some optional implementations of the present embodiment, the reference gray level may be a maximum gray level of a full gray level of the display panel. For example, the display panel is an 8-bit display panel, the full gray scale of the display panel is 0-255 gray scale, and the reference gray scale can be 255 gray scale.
Step 303, determining a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale.
In this embodiment, based on the average brightness of the test gray scale of the display panel at each test gray scale calculated in step 301 and the average brightness of the reference gray scale of the display panel at the reference gray scale calculated in step 302, the first gamma value corresponding to each test gray scale may be determined according to the average brightness of the test gray scale of the display panel at each test gray scale with the average brightness of the reference gray scale of the display panel at the reference gray scale as a reference.
Specifically, first, based on step 301 and step 302, the average brightness of the test gray level of each pixel under each test gray level can be obtainedAnd the reference gray scale average brightness of each pixel under the reference gray scaleWherein x is the gray scale value of any test gray scale,is the average brightness of the test gray scale corresponding to the gray scale value x, p is the gray scale value of the reference gray scale,the average brightness is the reference gray scale. Then, using the formulaThe average brightness of the test gray scale corresponding to the gray scale value x of the test gray scaleAnd reference gray scale average brightnessSubstituting the above formula, the first gamma value γ corresponding to the gray value x of the test gray can be calculated. It can be seen that the above formulaThe first gamma value corresponding to the gray level value of each test gray level can be calculated.
Step 304, sorting the first gamma values according to a preset rule, and calculating the difference value between each first gamma value and the adjacent first gamma value.
In this embodiment, based on the first gamma values corresponding to the test gray scales calculated in step 303, the first gamma values may be sorted according to a preset rule, for example, the first gamma values may be sorted from small to large. Then, for each sorted first gamma value, a difference value between two adjacent first gamma values can be calculated.
Step 305, when the difference is greater than the preset threshold, obtaining a smaller first gamma value of the adjacent first gamma values for determining the difference, taking a gray value of the test gray scale corresponding to the first gamma value as a partition point, and dividing the gray scale of which the gray value is greater than the partition point and the gray scale of which the gray value is less than or equal to the partition point into different gray scale regions.
In this embodiment, a preset threshold may be preset, and then the difference between the adjacent first gamma values γ calculated in step 304 is compared with the preset threshold, and when it is determined that the difference between the adjacent first gamma values γ is greater than the preset threshold, two adjacent first gamma values are obtained for determining, and the smaller first gamma value γ among the γ is determined. And then, acquiring a test gray scale corresponding to the first gamma value, and taking the test gray scale as a partition point. And finally, dividing the gray scale with the gray scale value larger than the partition point and the gray scale with the gray scale value smaller than the partition point into different gray scale areas. Therefore, each partition point in the full gray scale can be determined according to the partition point determining method, so that the full gray scale is divided into n gray scale areas.
Here, taking an 8-bit display panel as an example, the full gray scale of the display panel is 0 to 255 gray scales, and the designated test gray scales may be 5, 20, 35, 50, 65 … … 230, 245. And each test gray scale calculates a corresponding first gamma value. Arranging the first gamma values of the test gray scales from small to large, calculating the difference value of the adjacent first gamma values, obtaining the adjacent first gamma values of which the difference value is larger than a preset threshold value, and determining the reference gray scale corresponding to the smaller first gamma value as a partition point, for example, if the first gamma value gamma corresponding to the 35 gray scale is adjacent to the first gamma value gamma corresponding to the 50 gray scale, and the difference value of the first gamma values of the two is larger than the preset threshold value, the 35 gray scale can be used as the partition point to divide the 0-35 gray scale and the 36-255 gray scale into different gray scale regions respectively. The other test gray scales and the corresponding first gamma values are processed in the same way, and 0-255 gray scales can be sequentially divided into n gray scale areas.
In some optional implementation manners of this embodiment, the full gray scale of the display panel may be evenly distributed to form n gray scale regions, and the maximum gray scale and the minimum gray scale difference of each gray scale region may be equal. It is understood that the average division may be an absolute average division, for example, n is 2, the 0 to 127 gray levels in the full gray level may be the first gray level region, and the 128 to 255 gray levels may be the 2 nd gray level region; the division may be substantially equal, for example, when n is 5, the 0 to 50 grayscales of the full grayscales are the first grayscale region, the 51 to 101 grayscales are the 2 nd grayscale region, the 102 to 152 grayscales are the 3 rd grayscale region, the 153 to 203 grayscales are the 4 th grayscale region, the 204 to 255 grayscales are the 5 th grayscale region, and the number of grayscales included in the 5 th grayscale region is greater than that of the other grayscale regions.
Step 306, calculating an average value of the first gamma values corresponding to the test gray scales in the ith gray scale region, and taking the average value as the second gamma value.
In this embodiment, first, the test gray scale and the first gamma value corresponding to the test gray scale included in the ith gray scale region may be obtained based on each gray scale region determined in step 305. And then, calculating the average value of the acquired first gamma values, and taking the average value as a second gamma value corresponding to the ith gray scale area. Therefore, the method can be used for determining the second gamma value corresponding to each gray scale area in the full gray scale.
In some optional implementation manners of this embodiment, based on the gray scale regions determined in step 305, the test gray scale included in the ith gray scale region and the first gamma value corresponding to the test gray scale are obtained, and any one of the first gamma values corresponding to the test gray scale in the ith gray scale region may be further selected as the second gamma value corresponding to the ith gray scale region.
Step 307, determining the corrected relative brightness of any pixel at any gray level according to the actual brightness of any pixel at the maximum gray level and the second gamma value corresponding to each gray level region.
In this embodiment, for any pixel in the display panel, the actual brightness of the pixel at the maximum gray level may be first obtained by the brightness obtaining device. Then, for a certain gray scale, the gray scale region where the gray scale is located is determined, and a second gamma value corresponding to the gray scale region is obtained based on step 306. And finally, by taking the actual brightness of the pixel under the maximum gray scale as a reference, according to the second gamma value of the gray scale area where the gray scale is located, the corrected relative brightness of the pixel under the gray scale can be determined. It can be seen that the corrected relative brightness of each pixel in the display panel at each gray level can be determined using the above method. The corrected relative brightness table of the display panel can be generated according to the corrected relative brightness of each pixel in the display panel under each gray scale.
Specifically, for any pixel in the display panel, the actual brightness L of the pixel at the maximum gray level may be obtained firstqAnd a second gamma value corresponding to each gray scale region, wherein q is the gray scale value of the maximum gray scale. Then using the formulaThe corrected relative brightness of the pixel at y gray level can be calculated, wherein y is any gray level value of the pixel, and gamma isiA second gamma value L corresponding to the ith gray scale region where the gray scale value y is locatedyThe relative brightness of the pixel at the gray scale value y is corrected. As can be seen, the above formula is utilizedThe corrected relative brightness of each pixel in the display panel at each gray level can be calculated.
And 308, comparing the corrected relative brightness of each pixel with the pre-stored initial brightness to obtain a gray compensation coefficient of each pixel under any gray scale.
In this embodiment, a luminance obtaining device such as a CCD may be used to obtain the initial luminance of each pixel in the display panel in advance, and each initial luminance may be stored as a luminance information table. Thereafter, a corrected relative brightness table of the display panel may be generated based on the relative corrected brightness of each pixel in the display panel at each gray level determined in step 307. And then, comparing the pre-stored brightness information table of the display panel with the corrected relative brightness table of the display panel to obtain the brightness compensation coefficient of each pixel in the display panel. Finally, the luminance compensation coefficient may be further converted into a gray scale compensation coefficient for each pixel. The driving chip in the display panel may obtain the gray compensation coefficient, and may perform gray correction on each pixel in the display panel using the gray compensation coefficient. The method determines the brightness compensation coefficient and the gray level compensation coefficient by taking the actual brightness of each pixel under the maximum gray level as a reference, so that the brightness compensation coefficient and the gray level compensation coefficient are not greater than the maximum gray level after the gray level correction is carried out on each pixel.
According to the gray scale correction method of the display panel provided by the embodiment of the application, the first gamma value corresponding to each test gray scale can be determined by calculating the average brightness of the display panel under the specified test gray scale and the reference gray scale, the second gamma value corresponding to the ith gray scale region can be determined according to the first gamma value corresponding to the test gray scale included in the ith gray scale region after full gray scale division, the actual brightness of each pixel under the maximum gray scale is taken as the reference, the relative correction brightness of each pixel under each gray scale can be determined according to the second gamma value of each gray scale region, the brightness compensation coefficient and the gray scale compensation coefficient of each pixel are further determined, the gray scale correction precision of the display panel is improved, and the condition that the corrected gray scale of the display panel is larger than the maximum gray scale is avoided.
Referring to FIG. 4, a schematic structural diagram of an embodiment of a gray scale correction device of a display panel according to the present application is shown. This device embodiment corresponds to the method embodiment shown in fig. 2.
As shown in fig. 4, the gray-scale correction device 400 of the display panel of the present embodiment may include: a test gray-scale average luminance determining unit 401, a reference gray-scale average luminance determining unit 402, a first gamma value determining unit 403, a second gamma value determining unit 404, and a corrected relative luminance determining unit 405. The test gray scale average brightness determination unit 401 is configured to designate a plurality of test gray scales, detect actual brightness of each pixel when each test gray scale is input to the display panel, and calculate test gray scale average brightness of each pixel when a corresponding test gray scale is input to the display panel. The reference gray scale average brightness determining unit 402 is configured to designate a reference gray scale, detect actual brightness of each pixel when the reference gray scale is input to the display panel, and calculate reference gray scale average brightness of each pixel when the reference gray scale is input to the display panel; the first gamma value determining unit 403 is configured to determine a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale. The second gamma value determining unit 404 is configured to divide the full gray scale into n gray scale regions, and determine a second gamma value corresponding to the ith gray scale region according to a first gamma value corresponding to each test gray scale located in the ith gray scale region, where n is a preset positive integer, i is greater than or equal to 1 and less than or equal to n, and i is a positive integer. The corrected relative brightness determining unit 405 is configured to determine the corrected relative brightness of any pixel at any gray level according to the actual brightness of the pixel at the maximum gray level and the second gamma value corresponding to each gray level region.
In some optional implementations of the present embodiment, the second gamma value determining unit 404 is configured to further: sequencing the first gamma values according to a preset rule, and calculating the difference value of each first gamma value and the adjacent first gamma value; when the difference value is larger than a preset threshold value, a smaller first gamma value in adjacent first gamma values used for determining the difference value is obtained, a gray level value of a test gray level corresponding to the first gamma value is used as a partition point, and gray levels of which the gray level value is larger than the partition point and the gray level value is smaller than or equal to the partition point are divided into different gray level areas to form n gray level areas.
In some optional implementations of this embodiment, the difference between the maximum gray level and the minimum gray level in each gray level region is equal.
In some optional implementations of the present embodiment, the second gamma value determining unit 404 is configured to further: calculating the average value of the first gamma values corresponding to the test gray scales in the ith gray scale area, and taking the average value as a second gamma value; or any one of the first gamma values corresponding to the test gray scales in the ith gray scale area is selected as a second gamma value.
In some optional implementations of the present embodiment, the first gamma value determining unit 403 is configured to further: obtaining the average brightness of the test gray scale of each pixel under each test gray scaleAnd the reference gray scale average brightness of each pixel under the reference gray scaleAccording toCalculating a first gamma value corresponding to each test gray scale; wherein,is the average brightness of the reference gray scale, p is the gray scale value of the reference gray scale, x is the gray scale value of any test gray scale,the average brightness of the tested gray scale is corresponding to the gray scale value x, and gamma is the first gamma value corresponding to the gray scale value x.
In some optional implementations of the present embodiment, the corrected relative brightness determination unit 405 is configured to further: acquiring the actual brightness L of any pixel under the maximum gray scaleqA second gamma value corresponding to each gray scale region; according toCalculating the corrected relative brightness of the pixel under any gray scale; wherein L isqIs the actual brightness of any pixel at the maximum gray scale, q is the gray scale value of the maximum gray scale, and y is the actual brightness of the pixelAny gray scale value, γiA second gamma value L corresponding to the ith gray scale region where the gray scale value y is locatedyThe relative brightness of the pixel at the gray scale value y is corrected.
In some optional implementations of this embodiment, each of the gray scale regions may include at least one test gray scale; the reference gray scale may be a maximum gray scale among full gray scales.
In some optional implementations of the present embodiment, the gray scale correction apparatus 400 of the display panel further includes a gray scale compensation coefficient obtaining unit (not shown) configured to compare the corrected relative brightness of each pixel with a pre-stored initial brightness, and obtain a gray scale compensation coefficient of each pixel at any gray scale.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (16)
1. A gray scale correction method of a display panel is characterized by comprising the following steps:
appointing a plurality of test gray scales, detecting the actual brightness of each pixel when each test gray scale is input into the display panel, and calculating the average brightness of the test gray scale of each pixel when the display panel inputs the corresponding test gray scale;
appointing a reference gray scale, detecting the actual brightness of each pixel when the reference gray scale is input to the display panel, and calculating the average brightness of the reference gray scale of each pixel when the reference gray scale is input to the display panel;
determining a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale;
dividing a full gray scale into n gray scale regions, and determining a second gamma value corresponding to the ith gray scale region according to a first gamma value corresponding to each test gray scale located in the ith gray scale region, wherein n is a preset positive integer, i is more than or equal to 1 and less than or equal to n, and i is a positive integer;
and determining the corrected relative brightness of the pixel under any gray scale according to the actual brightness of any pixel under the maximum gray scale and the second gamma value corresponding to each gray scale area.
2. The method of claim 1, wherein said dividing the full gray scale into n gray scale regions comprises:
sequencing the first gamma values according to a preset rule, and calculating the difference value between each first gamma value and the first gamma value adjacent to the first gamma value;
when the difference value is larger than a preset threshold value, a smaller first gamma value in the adjacent first gamma values used for determining the difference value is obtained, a gray value of a test gray scale corresponding to the first gamma value is used as a partition point, and a gray scale with the gray value larger than the partition point and a gray scale with the gray value smaller than or equal to the partition point are divided into different gray scale areas to form n gray scale areas.
3. The method of claim 1, wherein the difference between the maximum gray level and the minimum gray level in each gray level section is equal.
4. The method of claim 1, wherein determining a second gamma value corresponding to an ith gray scale region according to a first gamma value corresponding to each of the test gray scales located in the ith gray scale region comprises:
calculating the average value of the first gamma values corresponding to the test gray scales in the ith gray scale area, and taking the average value as the second gamma value; or
And selecting any one of the first gamma values corresponding to the test gray scales in the ith gray scale area as the second gamma value.
5. The method of claim 1, wherein determining the first gamma value corresponding to each of the test gray levels according to the test gray level average brightness and the reference gray level average brightness comprises:
obtaining the average brightness of the test gray scale of each pixel under each test gray scaleAnd the reference gray scale average brightness of each pixel under the reference gray scale
According toCalculating a first gamma value corresponding to each test gray scale;
wherein,is the average brightness of the reference gray scale, p is the gray scale value of the reference gray scale, x is the gray scale value of any test gray scale,the average brightness of the tested gray scale is corresponding to the gray scale value x, and gamma is the first gamma value corresponding to the gray scale value x.
6. The method of claim 5, wherein determining the corrected relative brightness of the pixel at the maximum gray level according to the actual brightness of the pixel at the maximum gray level and the second gamma value corresponding to each gray level region comprises:
acquiring the actual brightness L of any pixel under the maximum gray scaleqA second gamma value corresponding to each of the gray scale regions;
according toCalculating the corrected relative brightness of the pixel under any gray scale;
wherein L isqIs the actual brightness of any pixel at the maximum gray scale, q is the gray scale value of the maximum gray scale, y is any gray scale value of the pixel, and gammaiA second gamma value L corresponding to the ith gray scale region where the gray scale value y is locatedyThe relative brightness of the pixel at the gray scale value y is corrected.
7. The method of claim 1, wherein each of said gray scale regions includes at least one of said test gray scales;
the reference gray scale is the maximum gray scale in the full gray scales.
8. The gamma correction method of claim 1, further comprising:
and comparing the corrected relative brightness of each pixel with the pre-stored initial brightness to obtain the gray compensation coefficient of each pixel under any gray scale.
9. A gray scale correction apparatus for a display panel, comprising:
the test gray scale average brightness determining unit is configured to designate a plurality of test gray scales, detect the actual brightness of each pixel when each test gray scale is input into the display panel, and calculate the test gray scale average brightness of each pixel when the display panel inputs the corresponding test gray scale;
the reference gray scale average brightness determining unit is configured to designate a reference gray scale, detect the actual brightness of each pixel when the reference gray scale is input to the display panel, and calculate the reference gray scale average brightness of each pixel when the reference gray scale is input to the display panel;
the first gamma value determining unit is configured to determine a first gamma value corresponding to each test gray scale according to the average brightness of each test gray scale and the average brightness of the reference gray scale;
the second gamma value determining unit is configured to divide a full gray scale into n gray scale regions, and determine a second gamma value corresponding to the ith gray scale region according to a first gamma value corresponding to each test gray scale located in the ith gray scale region, wherein n is a preset positive integer, i is greater than or equal to 1 and less than or equal to n, and i is a positive integer;
and the corrected relative brightness determining unit is configured to determine the corrected relative brightness of the pixel at any gray scale according to the actual brightness of any pixel at the maximum gray scale and the second gamma value corresponding to each gray scale area.
10. The gamma correction device of claim 9, wherein the second gamma value determination unit is further configured to:
sequencing the first gamma values according to a preset rule, and calculating the difference value between each first gamma value and the first gamma value adjacent to the first gamma value;
when the difference value is larger than a preset threshold value, a smaller first gamma value in the adjacent first gamma values used for determining the difference value is obtained, a gray value of a test gray scale corresponding to the first gamma value is used as a partition point, and a gray scale with the gray value larger than the partition point and a gray scale with the gray value smaller than or equal to the partition point are divided into different gray scale areas to form n gray scale areas.
11. The apparatus of claim 9, wherein the difference between the maximum gray level and the minimum gray level in each gray level section is equal.
12. The gamma correction device of claim 9, wherein the second gamma value determination unit is further configured to:
calculating the average value of the first gamma values corresponding to the test gray scales in the ith gray scale area, and taking the average value as the second gamma value; or
And selecting any one of the first gamma values corresponding to the test gray scales in the ith gray scale area as the second gamma value.
13. The gamma correction device of claim 9, wherein the first gamma value determination unit is further configured to:
obtaining the average brightness of the test gray scale of each pixel under each test gray scaleAnd the reference gray scale average brightness of each pixel under the reference gray scale
According toCalculating a first gamma value corresponding to each test gray scale;
wherein,is the average brightness of the reference gray scale, p is the gray scale value of the reference gray scale, x is the gray scale value of any test gray scale,the average brightness of the tested gray scale is corresponding to the gray scale value x, and gamma is the first gamma value corresponding to the gray scale value x.
14. The gamma correction device of claim 13, wherein the corrected relative brightness determination unit is further configured to:
acquiring the actual brightness L of any pixel under the maximum gray scaleqA second gamma value corresponding to each of the gray scale regions;
according toCalculating the corrected relative brightness of the pixel under any gray scale;
wherein L isqIs the actual brightness of any pixel at the maximum gray scale, q is the gray scale value of the maximum gray scale, y is any gray scale value of the pixel, and gammaiA second gamma value L corresponding to the ith gray scale region where the gray scale value y is locatedyThe relative brightness of the pixel at the gray scale value y is corrected.
15. The apparatus of claim 9, wherein each of said gray scale regions includes at least one of said test gray scales;
the reference gray scale is the maximum gray scale in the full gray scales.
16. The gamma correction device of claim 9, further comprising:
and the gray compensation coefficient acquisition unit is configured to compare the corrected relative brightness of each pixel with a pre-stored initial brightness and acquire a gray compensation coefficient of each pixel under any gray scale.
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| CN112992036A (en) * | 2021-02-26 | 2021-06-18 | 北海惠科光电技术有限公司 | Display panel driving method and device and display equipment |
| CN112992036B (en) * | 2021-02-26 | 2022-05-31 | 北海惠科光电技术有限公司 | Display panel driving method and device and display equipment |
| CN112967669B (en) * | 2021-03-02 | 2022-07-12 | 长春希达电子技术有限公司 | Correction method for improving gray scale consistency of LED display screen |
| CN112967669A (en) * | 2021-03-02 | 2021-06-15 | 长春希达电子技术有限公司 | Correction method for improving gray scale consistency of LED display screen |
| WO2022252302A1 (en) * | 2021-06-04 | 2022-12-08 | Tcl华星光电技术有限公司 | Correction method and correction apparatus for brightness of display panel |
| CN114112323A (en) * | 2021-11-08 | 2022-03-01 | 云谷（固安）科技有限公司 | Detection method and detection device for display uniformity of display panel |
| CN114112323B (en) * | 2021-11-08 | 2024-03-22 | 云谷（固安）科技有限公司 | Detection method and detection device for display uniformity of display panel |
| CN114420031A (en) * | 2022-01-30 | 2022-04-29 | 京东方科技集团股份有限公司 | Display panel and driving method thereof |
| CN114420031B (en) * | 2022-01-30 | 2023-12-26 | 京东方科技集团股份有限公司 | Display panel and driving method thereof |
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