CN113327534B - Data compensation method and data compensation device of display panel - Google Patents
Data compensation method and data compensation device of display panel Download PDFInfo
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- CN113327534B CN113327534B CN202110561033.3A CN202110561033A CN113327534B CN 113327534 B CN113327534 B CN 113327534B CN 202110561033 A CN202110561033 A CN 202110561033A CN 113327534 B CN113327534 B CN 113327534B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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- 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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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Abstract
The application discloses a data compensation method and a data compensation device of a display panel, wherein the data compensation method comprises the steps of firstly obtaining initial image data corresponding to at least two groups of different exposure values of the display panel, then fusing the initial image data corresponding to the at least two groups of different exposure values, and then determining the fused initial image data corresponding to the at least two groups of different exposure values as target image data, so that the real brightness data of the display panel can be obtained easily and accurately; and then, a corresponding data compensation table is generated by the target image data, so that the repair result of the data compensation of the display panel can be improved.
Description
Technical Field
The present application relates to the field of display technologies, and in particular, to a data compensation method and a data compensation apparatus for a display panel.
Background
When a display panel is used to repair uneven brightness display (Demura), a CCD (Charge Coupled Devices) camera/CMOS (Complementary Metal-Oxide-Semiconductor) camera is used to take a picture and sample the brightness of the display panel.
However, only one set of exposure values is used for shooting for a specific gray scale to obtain the brightness data of the display panel. In this case, when the luminance difference between the edge region and the center region of the display panel is large, the luminance data acquired by shooting with a group of exposure values may be underexposed in a region with low luminance, and overexposed in a region with high luminance, which results in loss of details of the acquired image and may not reflect the real luminance data of the panel, for example, as shown in fig. 1, overexposed in the lower left corner region, and underexposed in the center and the rest of the regions; as shown in fig. 2, most of the luminance data is at the middle and low gray levels, and a small portion of the luminance data is at the saturation value. In fig. 2, the abscissa represents a gray level, and the abscissa represents a probability of occurrence of a corresponding gray level.
Therefore, the compensation table obtained based on the luminance data corresponding to the image will seriously affect the repair result of gray scale data compensation of the display panel.
It should be noted that the above description of the background art is only for the sake of clarity and a complete understanding of the technical solutions of the present application. The technical solutions referred to above are therefore not considered to be known to the person skilled in the art, merely because they appear in the background of the present application.
Disclosure of Invention
The application provides a data compensation method and a data compensation device for a display panel, which are used for solving the technical problem that real brightness data of the display panel cannot be easily acquired by single exposure.
In a first aspect, the present application provides a data compensation method for a display panel, which includes: acquiring initial image data corresponding to at least two groups of different exposure values of a display panel, wherein each initial image data comprises initial coordinate data and initial brightness data of corresponding sub-pixels; determining the calibrated image data based on the fusion result of the initial image data corresponding to at least two groups of different exposure values; based on the target image data, a corresponding data compensation table is generated.
In some embodiments, the step of acquiring initial image data corresponding to at least two different sets of exposure values of the display panel, each initial image data including initial coordinate data and initial brightness data of corresponding sub-pixels, comprises: dividing the display panel into a plurality of display partitions based on the initial coordinate data and the initial brightness data of the corresponding sub-pixels; determining the partition brightness of each display partition based on the initial brightness data of the sub-pixels in each display partition; judging whether the brightness of each partition accords with a preset brightness range or not according to the partition brightness of each display partition; and if the partition brightness accords with the preset brightness range, determining the image data of the display partition corresponding to the partition brightness as initial image data.
In some embodiments, after the step of determining whether the brightness of each display partition meets the preset brightness range according to the brightness of each display partition, the method further includes: if the partition brightness does not accord with the preset brightness range, adjusting the exposure value; based on the adjusted exposure value, acquiring image data of the display partition which does not conform to the preset brightness range again; determining a partition brightness of the display partition acquired again based on the image data of the display partition acquired again; and if the partition brightness of the display partition acquired again accords with the preset brightness range, determining the image data of the display partition acquired again as initial image data.
In some embodiments, the step of determining the target image data based on the fusion result of the initial image data corresponding to the at least two different exposure values comprises: determining initial image data corresponding to each display partition based on the initial image data corresponding to at least two groups of different exposure values; and determining the calibrated image data based on the fusion result of the initial image data corresponding to each display partition.
In some embodiments, the step of determining the target image data based on the fusion result of the initial image data corresponding to each display region includes: determining fusion weight coefficients of the initial image data corresponding to the display partitions based on the partition brightness corresponding to the display partitions; and determining the calibrated image data based on the initial image data corresponding to each display partition and the fusion weight coefficient thereof.
In some embodiments, the determining the fusion weight coefficient of the initial image data corresponding to each display partition based on the partition brightness corresponding to each display partition includes: determining a preset brightness reference value based on the preset brightness range; determining the partition brightness of each display partition according to the initial brightness data of the sub-pixels in each display partition; and determining fusion weight coefficients of the initial image data corresponding to each display partition based on the absolute values of the difference values between the preset brightness reference value and the brightness of each partition.
In some embodiments, the target image data includes target coordinate data and target luminance data of the corresponding sub-pixels, and the step of generating the corresponding data compensation table based on the target image data includes: determining the calibrated brightness data based on the initial brightness data of the sub-pixels in each display partition, the fusion weight coefficient corresponding to each display partition and the adjustment times of the exposure value; based on the target brightness data, a corresponding data compensation table is generated.
In some embodiments, the step of determining the preset luminance reference value based on the preset luminance range further includes: determining two endpoint values of the preset brightness range based on the preset brightness range; and determining a preset brightness reference value according to the average value of the two endpoint values of the preset brightness range.
In some embodiments, the step of determining the partition brightness of each display partition according to the initial brightness data of the sub-pixels in each display partition comprises: calculating the sum of the initial brightness data of the sub-pixels in the display subarea according to the initial brightness data of the sub-pixels in the display subarea; and determining the partition brightness of the display partition according to the quotient of the sum of the initial brightness data of the sub-pixels in the display partition and the number of the sub-pixels in the display partition.
In a second aspect, the present application provides a data compensation apparatus for a display panel, which includes an obtaining module, a determining module, and a generating module; the acquisition module is used for acquiring initial image data corresponding to at least two groups of different exposure values of the display panel, and each initial image data comprises initial coordinate data and initial brightness data of corresponding sub-pixels; the determining module is used for determining the calibrated image data based on the fusion result of the initial image data corresponding to at least two groups of different exposure values; the generating module is used for generating a corresponding data compensation table based on the target image data.
According to the data compensation method and the data compensation device for the display panel, the initial image data corresponding to at least two groups of different exposure values of the display panel are obtained firstly, then the initial image data corresponding to at least two groups of different exposure values are fused, then the fused initial image data corresponding to at least two groups of different exposure values are determined to be target image data, and therefore the real brightness data of the display panel can be obtained easily and accurately; then, a corresponding data compensation table is generated by the target image data, so that the repair result of the data compensation of the display panel can be improved.
Drawings
The technical solutions and other advantages of the present application will become apparent from the following detailed description of specific embodiments of the present application when taken in conjunction with the accompanying drawings.
Fig. 1 is a schematic diagram of an image with poor exposure obtained in a conventional technical solution.
Fig. 2 is a schematic diagram of a gray scale histogram of the image shown in fig. 1.
Fig. 3 is a schematic flowchart of a data compensation method of a display panel according to an embodiment of the present disclosure.
Fig. 4 is a schematic working diagram of a data compensation method of a display panel according to an embodiment of the present disclosure.
Fig. 5 is a schematic structural diagram of a data compensation apparatus of a display panel according to an embodiment of the present disclosure.
Detailed Description
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. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 3 to 5, as shown in fig. 3, the present embodiment provides a data compensation method for a display panel, which includes the following steps:
step S10: acquiring initial image data corresponding to at least two groups of different exposure values of the display panel, wherein each initial image data comprises initial coordinate data and initial brightness data of corresponding sub-pixels.
Step S20: and determining the target image data based on the fusion result of the initial image data corresponding to at least two groups of different exposure values.
And step S30: based on the target image data, a corresponding data compensation table is generated.
It can be understood that, in the data compensation method for a display panel provided in this embodiment, the initial image data corresponding to at least two groups of different exposure values of the display panel is obtained first, then the initial image data corresponding to at least two groups of different exposure values is fused, and then it is determined that the fused initial image data corresponding to at least two groups of different exposure values is the target image data, so that the real brightness data of the display panel can be obtained relatively easily and accurately; then, a corresponding data compensation table is generated by the target image data, so that the repair result of the data compensation of the display panel can be improved.
It should be noted that the actual coordinates of each sub-pixel in the display panel and the coordinate data of each sub-pixel in the image data are in one-to-one correspondence, and the correspondence between the two can be realized through a corresponding coordinate mapping relationship. The image data may be initial image data or target image data.
It is understood that the raw image data acquired by a CCD (Charge Coupled Devices) camera/CMOS (Complementary Metal-Oxide-Semiconductor) camera may include at least one of coordinate data, gray scale data, and brightness data of each sub-pixel.
It can be understood that there is a difference in the image data acquired by different exposure values, and the display panel also needs the exposure value corresponding to the camera to acquire the image data with the optimal luminance data in different specific gray scales, so that it is also possible to try to acquire the optimal luminance data in different specific gray scales with different exposure values in sequence.
Wherein, the initial image data corresponding to at least two different exposure values may include, but is not limited to, the initial image data corresponding to one exposure value and the initial image data corresponding to another exposure value. The initial image data corresponding to the at least two groups of different exposure values may also include at least three groups of initial image data corresponding to the first group of exposure values, initial image data corresponding to the second group of exposure values, and initial image data corresponding to the nth group of exposure values, where N is greater than or equal to 3 and is a positive integer.
In one embodiment, the step of acquiring initial image data corresponding to at least two different sets of exposure values of the display panel, each initial image data including initial coordinate data and initial luminance data of corresponding sub-pixels, includes: the display panel is divided into a plurality of display partitions based on the initial coordinate data and the initial luminance data of the corresponding sub-pixels. The partition brightness for each display partition is determined based on the initial brightness data for the sub-pixels in each display partition. And judging whether the brightness of each partition accords with a preset brightness range or not according to the partition brightness of each display partition. And if the partition brightness accords with the preset brightness range, determining the image data of the display partition corresponding to the partition brightness as initial image data.
It should be noted that each display partition may include a plurality of sub-pixels adjacent to the initial coordinate data and/or a plurality of sub-pixels having initial luminance data within a certain range.
Wherein the preset luminance range may be characterized as a set of luminance data acquired by normal exposure. A lower limit value smaller than the preset luminance range may be characterized as a set of luminance data acquired under-exposure. An upper value greater than the preset luminance range may be characterized as a set of luminance data acquired under overexposure conditions. It will be appreciated that the acquired luminance data, whether under-exposed or over-exposed, is more or less distorted relative to the true luminance data of the display panel.
In one embodiment, after the step of determining whether the brightness of each display partition meets the preset brightness range according to the brightness of each display partition, the method further includes: if the partition brightness does not accord with the preset brightness range, the exposure value is adjusted. Based on the adjusted exposure value, image data of the display partition that does not conform to the preset luminance range is acquired again. Based on the image data of the display section acquired again, the section luminance of the display section acquired again is determined. And if the partition brightness of the display partition acquired again meets the preset brightness range, determining the image data of the display partition acquired again as initial image data.
It should be noted that, when the acquired image data of each display partition does not meet the preset brightness range under one exposure value, the image data of the corresponding display partition is not selected as the initial image data. And the image data corresponding to the display partition needs to be acquired again by taking the display partition as a target and using other exposure values until the acquired image data of the display partition conforms to the preset brightness range.
In one embodiment, the step of determining the scaled image data based on the fusion of the initial image data corresponding to the at least two different exposure values comprises: and determining initial image data corresponding to each display partition based on the initial image data corresponding to at least two groups of different exposure values. And determining the calibrated image data based on the fusion result of the initial image data corresponding to each display partition.
It should be noted that, in this embodiment, each set of initial image data may be a set of initial image data of all display partitions. Therefore, the initial image data of each display section can be selected and determined from each set of initial image data. It will be appreciated that this may be determined from the initial coordinate data of the sub-pixels in each display partition, since each sub-pixel may be distinguished by its corresponding initial coordinate data, which is also based on the initial coordinate data of each sub-pixel being unique, and thus the initial coordinate data and the initial luminance data of each sub-pixel may be interrelated.
In one embodiment, the step of determining the scaled image data based on the fusion result of the initial image data corresponding to each display region includes: and determining fusion weight coefficients of the initial image data corresponding to the display subareas based on the subarea brightness corresponding to the display subareas. And determining the calibrated image data based on the initial image data corresponding to each display partition and the fusion weight coefficient thereof.
In one embodiment, the step of determining the fusion weight coefficient of the initial image data corresponding to each display partition based on the partition brightness corresponding to each display partition comprises: and determining a preset brightness reference value based on the preset brightness range. And determining the partition brightness of each display partition according to the initial brightness data of the sub-pixels in each display partition. And determining fusion weight coefficients of the initial image data corresponding to each display partition based on the absolute values of the difference values between the preset brightness reference value and the brightness of each partition.
In this embodiment, the sum of the fusion weight coefficients of the initial image data corresponding to each display region may be a constant value, for example, 1. The smaller the absolute value of the difference between the preset brightness reference value and each partition brightness is, the larger the fusion weight coefficient of the initial image data of the display partition pair corresponding to the partition brightness is. Conversely, the larger the absolute value of the difference between the preset brightness reference value and each partition brightness is, the smaller the fusion weight coefficient of the initial image data of the display partition pair corresponding to the partition brightness is.
In one embodiment, the target image data includes target coordinate data and target luminance data of the corresponding sub-pixels, and the step of generating the corresponding data compensation table based on the target image data includes: and determining the calibrated brightness data based on the initial brightness data of the sub-pixels in each display partition, the fusion weight coefficient corresponding to each display partition and the adjustment times of the exposure value. Based on the target brightness data, a corresponding data compensation table is generated.
It should be noted that, in this embodiment, the target luminance data can be obtained according to the following formula:
where i is the adjustment number of exposure values, or may be the exposure number, and n is the maximum exposure number. Wn is a fusion weight coefficient corresponding to each display partition. Dn is the initial luminance data of the sub-pixels in each display section. D is target luminance data.
In one embodiment, the step of determining the preset luminance reference value based on the preset luminance range further includes: based on the preset brightness range, two endpoint values of the preset brightness range are determined. And determining a preset brightness reference value according to the average value of the two endpoint values of the preset brightness range.
It should be noted that, in this embodiment, the preset luminance reference value may also be an average value of all luminance values in the preset luminance range, and it can be understood that, since all luminance values in the preset luminance range are distributed evenly, an average value of two end points of the preset luminance range is equal to an average value of all luminance values in the preset luminance range.
In one embodiment, the step of determining the partition brightness of each display partition according to the initial brightness data of the sub-pixels in each display partition includes: and calculating the sum of the initial brightness data of the sub-pixels in the display subarea according to the initial brightness data of the sub-pixels in the display subarea. And determining the partition brightness of the display partition according to the quotient of the sum of the initial brightness data of the sub-pixels in the display partition and the number of the sub-pixels in the display partition.
It is understood that, in the present embodiment, the partition luminance of the display partition is the average luminance of the display partition.
As shown in fig. 4, based on some embodiments described above, the working process of the data compensation method of the display panel may be: when the display panel is used for repairing uneven brightness display (Demura), the existing data compensation table stored in the display panel is firstly erased. The mapping is then performed as described in some of the embodiments above to obtain the corresponding image data. And then, carrying out regional brightness evaluation, namely judging whether the regional brightness of each display region accords with a preset brightness range, if not, carrying out multiple exposure by using different exposure values to obtain multiple groups of initial image data, then selecting the initial image data of each display region from the different groups of initial image data to carry out image fusion, and carrying out corresponding data processing on the fused image. And if the image accords with the OK, directly carrying out corresponding data processing on the image before fusion. Then, a corresponding compensation Table (Table) is generated according to the image data after data processing. Then burning a compensation Table (Table) to the display panel, and restarting a time schedule controller of the display panel, so that the time schedule controller can call the repaired compensation Table, the gray scale compensation of the display panel can be realized, and the phenomenon of uneven brightness display is improved. Before the repair is finished (End), the effect evaluation may be performed on the initial repair of the display panel, and if not appropriate, the data compensation process described in the above embodiments may be performed again once or more times until a satisfactory repair effect is obtained.
As shown in fig. 5, in one embodiment, the present embodiment provides a data compensation apparatus for a display panel, which includes an obtaining module 10, a determining module 20, and a generating module 30. The obtaining module 10 is configured to obtain initial image data corresponding to at least two different exposure values of the display panel, where each initial image data includes initial coordinate data and initial brightness data of a corresponding sub-pixel. The determining module 20 is configured to determine the target image data based on a fusion result of the initial image data corresponding to the at least two sets of different exposure values. The generating module 30 is used for generating a corresponding data compensation table based on the target image data.
It can be understood that, in the data compensation apparatus for a display panel provided in this embodiment, by first obtaining initial image data corresponding to at least two groups of different exposure values of the display panel, then fusing the initial image data corresponding to the at least two groups of different exposure values, and then determining that the fused initial image data corresponding to the at least two groups of different exposure values is target image data, real luminance data of the display panel can be obtained relatively easily and accurately; and then, a corresponding data compensation table is generated by the target image data, so that the repair result of the data compensation of the display panel can be improved.
It should be noted that the obtaining module 10 may be electrically connected to the determining module 20, and the determining module 20 may be electrically connected to the generating module 30.
In one embodiment, the display panel may be, but is not limited to, a liquid crystal display panel, and may also be a self-luminous display panel.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
The data compensation method and the data compensation apparatus of the display panel provided in the embodiments of the present application are described in detail above, and specific examples are applied in the present application to explain the principles and embodiments of the present application, and the description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications or substitutions do not depart from the spirit and scope of the present disclosure as defined by the appended claims.
Claims (9)
1. A data compensation method of a display panel is characterized by comprising the following steps:
acquiring initial image data corresponding to at least two groups of different exposure values of the display panel, wherein each initial image data comprises initial coordinate data and initial brightness data of corresponding sub-pixels;
determining the calibrated image data based on the fusion result of the initial image data corresponding to the at least two groups of different exposure values;
generating a corresponding data compensation table based on the target image data;
wherein the step of obtaining initial image data corresponding to at least two groups of different exposure values of the display panel, each of the initial image data including initial coordinate data and initial brightness data of corresponding sub-pixels, comprises:
dividing the display panel into a plurality of display partitions based on the initial coordinate data and the initial brightness data of the corresponding sub-pixels;
determining the partition brightness of each display partition based on the initial brightness data of the sub-pixels in each display partition;
judging whether the partition brightness accords with a preset brightness range or not according to the partition brightness of each display partition;
and if the partition brightness accords with the preset brightness range, determining the image data of the display partition corresponding to the partition brightness as initial image data.
2. The data compensation method of claim 1, wherein after the step of determining whether the respective luminance values of the display regions conform to a predetermined luminance range according to the luminance values of the display regions, the method further comprises:
if the partition brightness does not accord with the preset brightness range, adjusting the exposure value;
based on the adjusted exposure value, acquiring image data of a display partition which does not accord with the preset brightness range again;
determining a partition brightness of the reacquired display partition based on the reacquired image data of the display partition;
and if the partition brightness of the re-acquired display partition meets a preset brightness range, determining the image data of the re-acquired display partition as initial image data.
3. The data compensation method of claim 1, wherein the step of determining the scaled image data based on the fused result of the initial image data corresponding to the at least two different exposure values comprises:
determining initial image data corresponding to each display partition based on the initial image data corresponding to the at least two groups of different exposure values;
and determining the calibrated image data based on the fusion result of the initial image data corresponding to each display subarea.
4. The data compensation method of claim 3, wherein the step of determining the scaled image data based on the fused result of the initial image data corresponding to each of the display sections comprises:
determining a fusion weight coefficient of initial image data corresponding to each display partition based on the partition brightness corresponding to each display partition;
and determining the target image data based on the initial image data corresponding to each display partition and the fusion weight coefficient of the initial image data.
5. The data compensation method of claim 4, wherein the step of determining the fusion weight coefficient of the initial image data corresponding to each display region based on the luminance of the region corresponding to each display region comprises:
determining a preset brightness reference value based on the preset brightness range;
determining the partition brightness of each display partition according to the initial brightness data of the sub-pixels in each display partition;
and determining a fusion weight coefficient of the initial image data corresponding to each display subarea based on the absolute value of the difference value between the preset brightness reference value and the brightness of each subarea.
6. The data compensation method of claim 5, wherein the target image data includes target coordinate data and target luminance data of corresponding sub-pixels, and the step of generating the corresponding data compensation table based on the target image data includes:
determining the target brightness data based on the initial brightness data of the sub-pixels in each display partition, the fusion weight coefficient corresponding to each display partition and the adjustment times of the exposure value;
and generating a corresponding data compensation table based on the target brightness data.
7. The data compensation method of claim 5, wherein the step of determining a preset luminance reference value based on the preset luminance range further comprises:
determining two endpoint values of the preset brightness range based on the preset brightness range;
and determining the preset brightness reference value according to the average value of the two endpoint values of the preset brightness range.
8. The data compensation method of claim 5, wherein the step of determining the partition brightness of each display partition from the initial brightness data of the sub-pixels in each display partition comprises:
calculating the sum of the initial brightness data of the sub-pixels in the display subarea according to the initial brightness data of the sub-pixels in the display subarea;
and determining the partition brightness of the display partition according to the quotient of the sum of the initial brightness data of the sub-pixels in the display partition and the number of the sub-pixels in the display partition.
9. A data compensation apparatus for a display panel, comprising:
the acquisition module is used for acquiring initial image data corresponding to at least two groups of different exposure values of the display panel, wherein each initial image data comprises initial coordinate data and initial brightness data of corresponding sub-pixels;
the determining module is used for determining the calibrated image data based on the fusion result of the initial image data corresponding to the at least two groups of different exposure values; and
the generating module is used for generating a corresponding data compensation table based on the target image data;
the acquiring of initial image data corresponding to at least two groups of different exposure values of the display panel, each of the initial image data including initial coordinate data and initial brightness data of corresponding sub-pixels, includes:
dividing the display panel into a plurality of display partitions based on the initial coordinate data and the initial brightness data of the corresponding sub-pixels;
determining the partition brightness of each display partition based on the initial brightness data of the sub-pixels in each display partition;
judging whether the partition brightness of each display partition meets a preset brightness range or not according to the partition brightness of each display partition;
and if the partition brightness accords with the preset brightness range, determining the image data of the display partition corresponding to the partition brightness as initial image data.
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