CN112233633B - Brightness compensation method, device, equipment and readable storage medium - Google Patents

Brightness compensation method, device, equipment and readable storage medium Download PDF

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Publication number
CN112233633B
CN112233633B CN202011175848.XA CN202011175848A CN112233633B CN 112233633 B CN112233633 B CN 112233633B CN 202011175848 A CN202011175848 A CN 202011175848A CN 112233633 B CN112233633 B CN 112233633B
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region
mura
compensation sub
display panel
regions
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CN112233633A (en
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陈锦峰
刘娜妮
苏毅烽
孔小丽
林启标
赵学宁
俞伟明
姚文健
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BOE Technology Group Co Ltd
Fuzhou BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Fuzhou BOE Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/10—Intensity circuits
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

The invention provides a brightness compensation method, a device, equipment and a readable storage medium, and relates to the technical field of display. The method comprises the steps of determining a Mura area in a display panel, and carrying out area division on the Mura area to obtain M rows and N columns of first target compensation subregions; and acquiring a first brightness compensation value corresponding to each first target compensation sub-area so as to perform brightness compensation on pixels in the first target compensation sub-area through the first brightness compensation value. When the Mura area is distributed along the row direction of the display panel, the number of rows of the first target compensation sub-area is increased, and the number of pixels in the column direction of the first target compensation sub-area is reduced.

Description

Brightness compensation method, device, equipment and readable storage medium
Technical Field
The present invention relates to the field of display technologies, and in particular, to a method, an apparatus, a device, and a readable storage medium for luminance compensation.
Background
In the process of producing a large-size display panel, due to the limitation of equipment and in order to reduce production cost, a small-sized mask is still adopted for splicing exposure to manufacture a large-size array substrate and a large-size color film substrate, however, after the array substrate and the color film substrate are combined into the display panel, the display panel has uneven brightness at the splicing position due to uneven exposure, namely, splicing Mura.
At present, in order to improve the spliced Mura in a large-size display panel, external optical compensation can be performed in a Demura manner, and the Demura manner is to divide a display area according to a fixed division manner to obtain a plurality of original compensation sub-areas, wherein the number of pixels in each corresponding original compensation sub-area is the same no matter the Mura area in the display area or a non-Mura area in the display area.
However, considering the requirement of storage capacity, the number of pixels in each original compensation sub-region is large, and the brightness of each pixel in each original compensation sub-region in the Mura region is likely to be non-uniform, that is, the Mura phenomenon also occurs in each original compensation sub-region, so after the pixels in each original compensation sub-region in the Mura region are respectively compensated, the brightness of all the pixels in each original compensation sub-region is increased or decreased as a whole, and the Mura phenomenon in the Mura region cannot be eliminated.
Disclosure of Invention
The invention provides a brightness compensation method, a device, equipment and a readable storage medium, which aim to solve the problem that the Mura phenomenon cannot be eliminated after brightness compensation is respectively carried out on pixels in each original compensation sub-area in a Mura area because the brightness of each pixel in each original compensation sub-area in the Mura area is easy to be uneven in the prior art.
In order to solve the above problem, the present invention discloses a brightness compensation method applied to a display panel, the method comprising:
determining a Mura region in a display area of the display panel;
performing region division on the Mura region to obtain M rows and N columns of first target compensation subregions; both M and N are positive integers greater than 1;
acquiring a first brightness compensation value corresponding to each first target compensation sub-region, so as to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value;
when the Mura region is distributed along the row direction of the display panel, the M is larger than the row number of an original compensation sub-region in the Mura region, and the number of pixels in the column direction of each first target compensation sub-region is smaller than the number of pixels in the column direction of the original compensation sub-region; when the Mura regions are distributed along the column direction of the display panel, the N is greater than the column number of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction of each first target compensation sub-region is less than the number of pixels in the row direction of the original compensation sub-region; the original compensation sub-area is a sub-area obtained by dividing the display area according to an originally fixed dividing mode.
Optionally, when the Mura regions are distributed along the row direction of the display panel, the N is smaller than the number of columns of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction in each first target compensation sub-region is greater than the number of pixels in the row direction in the original compensation sub-region;
when the Mura regions are distributed along the column direction of the display panel, the M is less than the number of rows of the original compensation sub-regions in the Mura regions, and the number of pixels in the column direction in each first target compensation sub-region is greater than the number of pixels in the column direction in the original compensation sub-region.
Optionally, after the step of determining a Mura region in a display area of the display panel, the method further includes:
performing region division on a non-Mura region in the display panel to obtain a plurality of second target compensation sub-regions; the non-Mura region is a region except the Mura region in a display area of the display panel;
acquiring a second brightness compensation value corresponding to each second target compensation sub-region, so as to perform brightness compensation on pixels in the second target compensation sub-region through the second brightness compensation value;
wherein the number of the second target compensation sub-regions in each row is less than the number of the original compensation sub-regions in the corresponding row located in the non-Mura region, and the number of the second target compensation sub-regions in each column is less than the number of the original compensation sub-regions in the corresponding column located in the non-Mura region; and the number of pixels in the row direction of each second target compensation sub-area is greater than that in the original compensation sub-area, and the number of pixels in the column direction of each second target compensation sub-area is greater than that in the original compensation sub-area.
Optionally, the step of determining a Mura region in a display area of the display panel includes:
acquiring an original image corresponding to the display panel;
extracting a brightness coordinate curve of the original image;
and determining a Mura area in the display panel according to the brightness coordinate curve.
Optionally, the step of determining a Mura region in a display area of the display panel according to the luminance coordinate curve includes:
acquiring the brightness value of each pixel in the brightness coordinate curve;
calculating a difference between the brightness value of each pixel and the brightness value of the central pixel in the original image;
and determining the area where the pixel with the ratio of the difference value to the brightness value of the central pixel larger than a preset threshold value is located as the Mura area.
Optionally, the step of determining a Mura region in a display area of the display panel includes:
when a mask plate is adopted for splicing exposure to manufacture the display panel, determining a region corresponding to the splicing position of the mask plate as a splicing region of the display panel;
and determining a Mura area in a display area of the display panel according to the splicing area.
Optionally, the step of obtaining a first brightness compensation value corresponding to each first target compensation sub-region to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value includes:
acquiring an average value of luminance values of the pixels in each first target compensation sub-region and a luminance value of a central pixel of the display panel;
and taking the difference value between the average value and the brightness value of the central pixel as a first brightness compensation value corresponding to the first target compensation sub-region, so as to perform brightness compensation on the first target compensation sub-region through the first brightness compensation value.
In order to solve the above problem, the present invention also discloses a brightness compensation device applied to a display panel, the device comprising:
a Mura region determination module configured to determine a Mura region in a display area of the display panel;
the Mura region dividing module is configured to perform region division on the Mura region to obtain M rows and N columns of first target compensation sub-regions; both M and N are positive integers greater than 1;
a first brightness compensation value obtaining module configured to obtain a first brightness compensation value corresponding to each first target compensation sub-region, so as to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value;
when the Mura region is distributed along the row direction of the display panel, the M is larger than the row number of an original compensation sub-region in the Mura region, and the number of pixels in the column direction of each first target compensation sub-region is smaller than the number of pixels in the column direction of the original compensation sub-region; when the Mura regions are distributed along the column direction of the display panel, the N is greater than the column number of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction of each first target compensation sub-region is less than the number of pixels in the row direction of the original compensation sub-region; the original compensation sub-area is a sub-area obtained by dividing the display area according to an originally fixed dividing mode.
In order to solve the above problem, the present invention also discloses an illumination compensation device, which includes a processor, a memory, and a computer program stored on the memory and operable on the processor, wherein the computer program, when executed by the processor, implements the steps of the illumination compensation method described above.
In order to solve the above problem, the present invention also discloses a readable storage medium on which a program or instructions are stored, which when executed by a processor implement the steps of the above brightness compensation method.
Compared with the prior art, the invention has the following advantages:
in the embodiment of the invention, the Mura area in the display area of the display panel is determined; performing region division on the Mura region to obtain M rows and N columns of first target compensation subregions; acquiring a first brightness compensation value corresponding to each first target compensation sub-region so as to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value; when the Mura area is distributed along the row direction of the display panel, M is larger than the row number of the original compensation sub-area in the Mura area, and the number of pixels in the column direction in each first target compensation sub-area is smaller than that in the original compensation sub-area; when the Mura regions are distributed along the column direction of the display panel, N is larger than the column number of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction in each first target compensation sub-region is smaller than the number of pixels in the row direction in the original compensation sub-region. When the Mura area is distributed along the row direction of the display panel, the number of rows of the first target compensation sub-areas obtained by dividing is increased when the Mura area is divided, so that the number of pixels of each first target compensation sub-area in the column direction is reduced, and the phenomenon of uneven brightness of the pixels in each first target compensation sub-area in the column direction is reduced.
Drawings
Fig. 1 shows a schematic diagram of region division of a Mura region in the prior art;
FIG. 2 is a flow chart illustrating a method of brightness compensation according to an embodiment of the present invention;
FIG. 3 shows a schematic view of a display panel with through Mura;
fig. 4 shows a region division diagram including both Mura regions distributed in a display panel row direction and Mura regions distributed in a display panel column direction;
fig. 5 shows a region division diagram including only Mura regions distributed in a display panel row direction;
fig. 6 shows a region division diagram including only Mura regions distributed in a display panel column direction;
FIG. 7 is a flow chart illustrating another brightness compensation method according to an embodiment of the present invention;
fig. 8 shows a luminance coordinate curve of a display panel having Mura regions distributed in a display panel column direction;
fig. 9 shows a luminance coordinate curve of a display panel having Mura regions distributed in a row direction of the display panel;
fig. 10 is a block diagram showing a structure of a luminance compensation apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
At present, when a Mura phenomenon occurs in a display panel, a display area in the display panel is optically compensated in a Demura manner, and in an optical compensation process, the display area is divided according to a fixed division manner, as shown in fig. 1, the display panel is divided into 18 rows and 36 columns of original compensation sub-areas, a format of each original compensation sub-area is 4 × 4, that is, each original compensation sub-area includes 4 rows and 4 columns of pixels. The display panel has Mura regions respectively penetrating the display panel along a row direction and a column direction, the Mura regions penetrating the display panel along the row direction comprise 12 pixels in the column direction, and the Mura regions penetrating the display panel along the column direction comprise 4 pixels in the row direction. As can be seen from fig. 1, in each column of original compensation sub-regions, the region where the Mura region contacts with the non-Mura region in the display panel is located in one original compensation sub-region, as shown in fig. 1, parts 11 and 12, where both the Mura region and the non-Mura region exist in the original compensation sub-region, that is, a plurality of pixels in the original compensation sub-region, one part of the pixels are located in the Mura region, and the other part of the pixels are located in the non-Mura region, and since the brightness of the pixels in the Mura region and the brightness of the pixels in the non-Mura region in the display panel are different, a phenomenon of significant brightness unevenness occurs in the original compensation sub-region; similarly, in each row of original compensation sub-regions, the region where the Mura region contacts the non-Mura region in the display panel is located in one original compensation sub-region, as shown in fig. 1, parts 13 and 14, where both the Mura region and the non-Mura region exist, i.e., a plurality of pixels in the original compensation sub-region, one part of the pixels are located in the Mura region, and the other part of the pixels are located in the non-Mura region, and since the brightness of the pixels in the Mura region and the brightness of the pixels in the non-Mura region in the display panel are different, the phenomenon of significant brightness unevenness also occurs in the original compensation sub-region.
Therefore, when the number of pixels in each original compensation sub-region is large, the pixels in one original compensation sub-region are prone to have a luminance non-uniformity phenomenon, and in the conventional luminance compensation method, each original compensation sub-region is compensated by using one luminance compensation value, and after the luminance compensation is performed on the pixels in the corresponding original compensation sub-region by using the luminance compensation values, the luminance of all the pixels in the original compensation sub-region is integrally increased or integrally reduced, and the luminance non-uniformity phenomenon in the original compensation sub-region cannot be eliminated, that is, the Mura phenomenon in the display panel cannot be eliminated.
In the embodiment of the invention, after the Mura area in the display panel is determined, the Mura area is divided, when the Mura regions are distributed along the row direction of the display panel, the number of rows of the divided first target compensation sub-regions is increased, so that the number of pixels of each first target compensation sub-region in the column direction is reduced, thereby reducing the occurrence of brightness non-uniformity of pixels in each first target compensation sub-region in the column direction, when the Mura regions are distributed along the column direction of the display panel, the number of columns of the divided first target compensation sub-regions is increased, so that the number of pixels of each first target compensation sub-region in the row direction is reduced, thereby reducing the occurrence of brightness non-uniformity in the pixels in each of the first target compensation sub-regions in the row direction, and, therefore, after the pixels in each first target compensation sub-area are compensated, the Mura phenomenon of the Mura area can be reduced.
Example one
Referring to fig. 2, a flowchart of a luminance compensation method according to an embodiment of the present invention is shown, and applied to a display panel, the method may specifically include the following steps:
step 201, determining a Mura region in a display area of the display panel.
In the embodiment of the present invention, in a production process of a large-sized display panel, a small-sized mask plate is usually required to be used for manufacturing by means of mosaic exposure, in the process, the mosaic exposure may occur on an array substrate side or a color film substrate side, and due to problems such as repeated exposure in a mosaic region, a phenomenon of uneven brightness in the mosaic region in the display panel, that is, a Mura phenomenon occurs, and the Mura region formed by the mosaic exposure usually penetrates through the display panel along a row direction and/or a column direction of the display panel.
In the embodiment of the present invention, a display panel having a Mura region is obtained, where the Mura region may be caused by the above splicing exposure or by other manufacturing processes, and the Mura region may or may not penetrate through the display panel. After the display panel with the Mura region is obtained, the Mura region in the display region of the display panel needs to be determined, the Mura region can be determined in an optical grabbing mode, and can also be determined according to a region corresponding to the splicing position of a mask plate during splicing exposure, and the determination of the Mura region is used for positioning the subsequent division of the Mura region.
Step 202, performing region division on the Mura region to obtain M rows and N columns of first target compensation sub-regions; and both M and N are positive integers greater than 1.
In the embodiment of the present invention, in the conventional dividing manner, the entire display panel is composed of a plurality of original compensation sub-regions in the format of a1 × b1, and the Mura region in the display panel is also composed of original compensation sub-regions in the format of a1 × b1, that is, each original compensation sub-region includes a1 rows and b1 columns of pixels. In the embodiment of the present invention, after a Mura region in a display panel is determined, the Mura region is subjected to region division, that is, a dividing manner of an original compensation sub-region in a format of a1 × B1 that is originally inherent is changed, so as to obtain M rows and N columns of first target compensation sub-regions, where a format of each first target compensation sub-region is a1 × B1, that is, each first target compensation sub-region includes a1 rows and B1 columns of pixels, where M and N are positive integers greater than 1, and a1, B1, a1, and B35 1 are positive integers greater than or equal to 1.
When the Mura area is distributed along the row direction of the display panel, M is larger than the row number of the original compensation sub-area in the Mura area, and the number of pixels in the column direction in each first target compensation sub-area is smaller than that in the original compensation sub-area; when the Mura regions are distributed along the column direction of the display panel, N is larger than the column number of original compensation sub-regions in the Mura regions, and the number of pixels in the row direction of each first target compensation sub-region is smaller than the number of pixels in the row direction of the original compensation sub-region; the original compensation sub-area is a sub-area obtained by dividing the display area according to an original fixed dividing mode.
Specifically, when the Mura regions are distributed along the row direction of the display panel, as shown in fig. 3, 31 is the Mura region distributed along the row direction of the display panel, and the number M of rows of the first target compensation sub-region obtained by performing region division on the Mura region is greater than the number M of rows of the original compensation sub-region in the Mura region, because the range of the whole Mura region is not changed, after the region division is performed on the Mura region, the number of pixels in the column direction in each first target compensation sub-region is smaller than the number of pixels in the column direction in the original compensation sub-region, that is, B1 is smaller than B1 at this time, so that the division of the Mura region in the column direction is finer, which is beneficial to performing finer luminance compensation on the Mura region in the column direction subsequently.
When the Mura regions are distributed in the column direction of the display panel, as shown in fig. 3, 32 is the Mura region distributed in the column direction of the display panel, the number of columns N of the first target compensation subarea obtained after the Mura area is divided is larger than the number of columns of the original compensation subarea in the Mura area, that is, after the Mura region is divided into regions, the number of columns of the first target compensation sub-region in the Mura region is larger than the number of columns of the original compensation sub-region in the Mura region, and since the range of the whole Mura region is not changed, after the Mura area is divided into areas, the number of pixels in the row direction of each first target compensation sub-area is less than that in the original compensation sub-area, that is, a1 is smaller than a1 at this time, so that the Mura region is divided more finely in the row direction, which is beneficial to performing more fine brightness compensation on the Mura region in the row direction later.
For example, when one display panel has both the Mura regions distributed along the row direction and the column direction of the display panel, that is, both the Mura region 31 and the Mura region 32 are included in fig. 3, the Mura region 31 includes 12 pixels in the column direction of the display panel, and the Mura region 32 includes 4 pixels in the row direction of the display panel. In the conventional division manner, the Mura region is composed of a plurality of original compensation sub-regions in 4 × 4 format, as shown in fig. 1, the Mura region 31 is distributed in 4 rows of original compensation sub-regions, and the Mura region 32 is distributed in 2 columns of original compensation sub-regions.
In the embodiment of the present invention, as shown in fig. 4, the Mura region 31 is divided into 8 rows of first target compensation sub-regions by dividing the first target compensation sub-regions in an 8 × 2 format, the Mura region 32 is then regionally partitioned according to a first target compensation sub-region in a2 x 8 format, in order to consider the integrity of the second target compensation sub-region obtained by subsequently dividing the non-Mura region, the Mura region 32 is divided into 8 columns of the first target compensation sub-regions, as shown in fig. 4, the region where the Mura region 31 and the Mura region 32 overlap each other is divided into first target compensation sub-regions in a2 x 2 format, and at this time, the phenomenon of including both Mura regions and non-Mura regions does not occur in each of the first target compensation sub-regions, therefore, the subsequent brightness compensation of the display panel is facilitated, and the Mura phenomenon in the display panel is eliminated.
Optionally, when only the Mura region 31 is shown in fig. 3, the Mura region 31 includes 12 pixels in the column direction of the display panel, and according to the original inherent dividing manner, the Mura region includes a plurality of original compensation sub-regions in 4 × 4 format, and the Mura regions are distributed in the original compensation sub-regions in 4 rows, as shown in fig. 1, and there is a phenomenon that both the Mura region and the non-Mura region exist in one original compensation sub-region, that is, there is a large luminance variation in the original compensation sub-region, and therefore, it is not beneficial to the subsequent luminance compensation; in the embodiment of the present invention, 4 lines of original compensation sub-regions distributed in the Mura region are divided according to the format of the first target compensation sub-region, as shown in fig. 5, when the format of the first target compensation sub-region is 8 × 2, the 4 lines of original compensation sub-regions originally distributed in the Mura region are divided into 8 lines of first target compensation sub-regions, that is, in the Mura region, the number of lines of the first target compensation sub-region is greater than the number of lines of the original compensation sub-region. Moreover, after the Mura region is divided, the phenomenon that both the Mura region and the non-Mura region exist in the first target compensation sub-region can be seen to be absent, namely, the first target compensation sub-region does not have large brightness change, so that the subsequent brightness compensation is facilitated.
Optionally, when only the Mura region 32 is shown in fig. 3, the Mura region 32 includes 4 pixels in the row direction of the display panel, and according to the original inherent dividing manner, the Mura region includes a plurality of original compensation sub-regions in 4 × 4 format, the Mura region is distributed in 2 columns of original compensation sub-regions, as shown in fig. 1, and there is a phenomenon that there are both Mura regions and non-Mura regions in one original compensation sub-region, that is, there is a large luminance variation in the original compensation sub-region, and therefore, it is not beneficial to the subsequent luminance compensation; in the embodiment of the present invention, two columns of original compensation sub-regions distributed in the Mura region are divided according to the format of the first target compensation sub-region, as shown in fig. 6, when the format of the first target compensation sub-region is 2 × 8, 2 columns of original compensation sub-regions originally distributed in the Mura region are divided into 4 columns of first target compensation sub-regions, that is, in the Mura region, the number of columns of the first target compensation sub-regions is greater than the number of columns of the original compensation sub-regions. Moreover, after the Mura region is divided, the phenomenon that both the Mura region and the non-Mura region exist in a first target compensation sub-region can be seen to be absent, namely, a large brightness change does not exist in the first target compensation sub-region, so that the subsequent brightness compensation is facilitated.
Step 203, obtaining a first brightness compensation value corresponding to each first target compensation sub-region, so as to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value.
In the embodiment of the present invention, after the Mura region is divided into a plurality of first target compensation sub-regions, a first luminance compensation value corresponding to the first target compensation sub-region needs to be obtained, and luminance compensation is performed on pixels in the first target compensation sub-region through the first luminance compensation value, where the first luminance compensation value is a difference between an average value of luminance values of the pixels in the first target compensation sub-region and a reference luminance value. Therefore, after the pixels in the first target compensation sub-area are subjected to brightness compensation by using the first brightness compensation value, the average value of the brightness values of the pixels in the first target compensation sub-area can reach the reference brightness value, so that the Mura phenomenon in the first target compensation sub-area is eliminated.
In the embodiment of the present invention, by determining the Mura region in the display region of the display panel, when the Mura region is distributed along the row direction of the display panel, when the Mura region is divided, the number of rows of the first target compensation sub-regions obtained by dividing is increased, so that the number of pixels of each first target compensation sub-region in the column direction is reduced, thereby reducing the phenomenon of uneven brightness of the pixels in each first target compensation sub-region in the column direction, when the Mura region is distributed along the column direction of the display panel, when the Mura region is divided, the number of columns of the first target compensation sub-regions obtained by dividing is increased, so that the number of pixels of each first target compensation sub-region in the row direction is reduced, thereby reducing the phenomenon of uneven brightness of the pixels in each first target compensation sub-region in the row direction, therefore, after the pixels in each first target compensation sub-region are compensated, the Mura phenomenon in the Mura area can be reduced.
Example two
Referring to fig. 7, a flowchart illustrating another brightness compensation method according to an embodiment of the present invention is shown, which may specifically include the following steps:
step 701, determining a Mura area in a display area of the display panel.
In the embodiment of the present invention, after obtaining the display panel having the Mura region, the Mura region in the display area of the display panel needs to be determined, and step 701 includes sub-steps S7011, S7012, and 73013:
and a substep S7011 of obtaining an original image corresponding to the display panel.
In the embodiment of the present invention, the display panel is lit, the display panel is adjusted to a certain specific gray scale for displaying, the display panel is photographed by a CCD (charge coupled device) in the luminance compensation device, an original image of the display panel is obtained, the original image includes a Mura region and a non-Mura region, and a luminance coordinate curve of the display panel can be obtained subsequently according to the original image.
And a substep S7012 of extracting a luminance coordinate curve of the original image.
In the embodiment of the present invention, after an original image of a display panel is acquired, a corresponding luminance coordinate curve is extracted from the original image, where the luminance coordinate curve includes luminance values corresponding to pixels at different positions in the display panel, and therefore, according to the luminance coordinate curve, it can be seen whether a phenomenon of uneven luminance, i.e., a Mura phenomenon, exists in the display panel.
And a substep S7013 of determining a Mura region in a display area of the display panel according to the brightness coordinate curve.
In the embodiment of the present invention, after the luminance coordinate curve in the original image is extracted, the Mura region in the display area of the display panel needs to be determined according to the luminance coordinate curve.
Substep S7013 specifically includes: acquiring the brightness value of each pixel in the brightness coordinate curve; calculating a difference between the brightness value of each pixel and the brightness value of the central pixel in the original image; and determining the area where the pixel with the ratio of the difference value to the brightness value of the central pixel larger than a preset threshold value is located as the Mura area.
In the embodiment of the present invention, after extracting a luminance coordinate curve of an original image, obtaining a luminance value of each pixel in a display panel from the luminance coordinate curve, then taking the luminance value of a center pixel of the display panel as a reference luminance value, where the center pixel of the display panel is a pixel located at a center position of the display panel, calculating a difference between the luminance value of each pixel and the reference luminance value, obtaining a ratio between each difference and the reference luminance value, and further determining a pixel having the ratio greater than a preset threshold, where when the ratio is greater than the preset threshold, it is indicated that there is a more significant luminance nonuniformity between the luminance value of the pixel and the reference luminance value, and therefore, a region where the pixel having the ratio greater than the preset threshold is determined as a Mura region, where the preset threshold is 1%, and certainly, the preset threshold may also be set according to an actual situation, the invention is not limited in this regard.
As shown in fig. 8 and 9, where H denotes coordinates of pixels in the display panel in the row direction, V denotes coordinates of pixels in the display panel in the column direction, fig. 8 is a luminance coordinate curve in the row direction of the display panel, 81 in fig. 8 denotes a distribution of Mura regions in the column direction of the display panel, fig. 9 is a luminance coordinate curve in the column direction of the display panel, and 91 in fig. 9 denotes a distribution of Mura regions in the row direction of the display panel. Determining the Mura region is beneficial to positioning the subsequent brightness compensation region.
In another alternative embodiment of the present invention, after obtaining the display panel having the Mura region, step 701 includes sub-steps S7014 and S7015:
and a substep S7014, determining a region corresponding to the splicing position of the mask plate as the splicing region of the display panel when the display panel is manufactured by splicing and exposing the mask plate.
In the embodiment of the invention, in the manufacturing process of the large-size display panel, because the small-size mask plate is usually adopted to be manufactured through splicing exposure, and the splicing area appears at the fixed position of the display panel in the splicing exposure process, when the display panel is manufactured through the splicing exposure of the mask plate, the area corresponding to the splicing position of the mask plate is determined as the splicing area of the display panel.
For example, in the process of manufacturing a display panel, when a mask plate is used for performing a splicing exposure, when the splicing position of the mask plate is along the column direction of the display panel and penetrates through the display panel, the splicing area is along the column direction of the display panel and penetrates through the display panel. Of course, in the process of manufacturing the display panel, the splicing position of the mask plate may also penetrate through the display panel along the row direction of the display panel, and at this time, the splicing area corresponding to the splicing position also penetrates through the display panel along the row direction of the display panel.
And a substep S7015 of determining a Mura region in the display region of the display panel according to the splicing region.
In the embodiment of the invention, after the splicing area is determined, when the splicing area penetrates through the display panel along the column direction of the display panel, the splicing area is taken as the center, the preset areas are respectively extended to two sides of the display panel, and the splicing area after the preset areas are extended is determined as the Mura area of the display panel. Because the coordinates of the splicing region of the mask plate are known, the position of the Mura region can be determined according to the preset region, the Mura region comprises the splicing region corresponding to the mask plate, and the determined Mura region penetrates through the display panel along the column direction of the display panel. When the splicing area penetrates through the display panel along the row direction of the display panel, the determined Mura area also penetrates through the display panel along the row direction of the display panel.
For example, the splicing position of the mask plate is arranged to penetrate through the display panel along the column direction of the display panel, and the splicing region is located at the center of the display panel in the row direction of the display panel, at this time, the display panel is divided into 8 parts along the column direction, preset regions of 1/8 located at two sides of the center of the splicing region in the display panel are determined as Mura regions, at this time, the Mura regions are located at the center of the display panel in the row direction of the display panel and occupy 1/4 of the size of the row direction of the display panel, and regions located at two sides 3/8 of the Mura regions respectively are non-Mura regions of the display panel.
In the embodiment of the invention, when the Mura area in the display panel is determined according to the splicing area, the splicing area is directly determined according to the splicing exposure position in the manufacturing process of the display panel, so that the steps of acquiring an original picture of the display panel, extracting a brightness coordinate curve in the original picture and determining the Mura area in the display panel according to the brightness coordinate curve are not needed, the determination mode of the Mura area is simple, in addition, after the splicing area of the display panel is determined, the splicing area is extended to two sides to form the preset area so as to determine the Mura area, and enough fluctuation space can be reserved for the splicing exposure process of the display panel, thereby being beneficial to the manufacturing of the display panel.
Step 702, performing region division on the Mura region to obtain M rows and N columns of first target compensation subregions; and both M and N are positive integers greater than 1.
This step is similar to the step 202 in the first embodiment, and is not described herein again.
Optionally, when the Mura regions are distributed along the row direction of the display panel, the N is smaller than the number of columns of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction in each first target compensation sub-region is greater than the number of pixels in the row direction in the original compensation sub-region; when the Mura regions are distributed along the column direction of the display panel, the M is less than the number of rows of the original compensation sub-regions in the Mura regions, and the number of pixels in the column direction in each first target compensation sub-region is greater than the number of pixels in the column direction in the original compensation sub-region.
Specifically, when the Mura region is distributed in the row direction of the display panel, the Mura region is divided into N rows and N columns of first target compensation sub-regions, where the number of columns N of the first target compensation sub-regions is smaller than the number of columns of original compensation sub-regions in the Mura region, and since the range of the Mura region is not changed, when the number of columns N of the first target compensation sub-regions in the divided Mura region is smaller than the number of columns of original compensation sub-regions in the Mura region, the number of pixels in the row direction in each first target compensation sub-region is naturally increased, that is, the number of pixels in the row direction in each first target compensation sub-region is greater than the number of pixels in the row direction in the original compensation sub-region. Therefore, when the Mura regions are distributed along the row direction of the display panel, although the number of rows of the first target compensation sub-regions in the Mura regions is increased, the number of columns of the first target compensation sub-regions in the Mura regions is decreased, and therefore, after the Mura regions are divided, the phenomenon that the number of the first target compensation sub-regions in the Mura regions is obviously increased relative to the number of original compensation sub-regions in the Mura regions is avoided, and therefore, the working efficiency of subsequent compensation on the Mura regions and the storage space of the display panel are not obviously affected.
Correspondingly, when the Mura area is distributed along the column direction of the display panel, the Mura area is divided into M rows and N columns of first target compensation sub-areas, the number of rows M of the first target compensation sub-areas is less than the number of rows of original compensation sub-areas in the Mura area, and since the range of the Mura area is not changed at all, when the number of rows M of the first target compensation sub-areas in the divided Mura area is less than the number of rows of the original compensation sub-areas in the Mura area, at this time, the number of pixels in the column direction in each first target compensation sub-area will naturally increase, that is, the number of pixels in the column direction in each first target compensation sub-area is greater than the number of pixels in the column direction in the original compensation sub-area. Therefore, when the Mura region is distributed along the column direction of the display panel, although the number of columns of the first target compensation sub-region in the Mura region is increased, the number of rows of the first target compensation sub-region in the Mura region is reduced, and therefore, after the Mura region is divided, the number of the first target compensation sub-region in the Mura region is not obviously increased compared with the number of original compensation sub-regions in the Mura region, and therefore, the work efficiency of subsequently compensating the Mura region and the storage space of the display panel are not obviously affected.
For example, when fig. 3 includes both the Mura region 31 and the Mura region 32, and the Mura region 31 includes 12 pixels along the column direction of the display panel, and the Mura region 32 includes 4 pixels along the row-column direction of the display panel, in the conventional dividing manner, the Mura region is composed of a plurality of original compensation sub-regions in 4 × 4 format, as shown in fig. 1, the Mura region 31 includes 4 rows and 36 columns of original compensation sub-regions, and the Mura region 32 includes 2 columns and 18 rows of original compensation sub-regions.
In the embodiment of the present invention, the Mura region 31 is divided into the first target compensation sub-regions in the format of 8 × 2, as shown in fig. 4, at this time, although the number of rows of the first target compensation sub-regions in the Mura region 31 is increased, the number of columns of the first target compensation sub-regions in the Mura region 31 is decreased, the number of pixels in the row direction of each first target compensation sub-region in the Mura region 31 is changed from 4 to 8, the Mura region 32 is divided into the first target compensation sub-regions in the format of 2 × 8, so that the number of rows of the first target compensation sub-regions in the Mura region 32 is decreased, the number of pixels in the column direction of each first target compensation sub-region in the Mura region 32 is changed from 4 to 8, and the region where the Mura region 31 and the Mura region 32 overlap with each other is divided into the first target compensation sub-regions in the format of 2, after the region division is performed, the Mura area 31 includes 8 rows and 24 columns of first target compensation sub-areas, and the Mura area 32 includes 15 rows and 8 columns of first target compensation sub-areas.
Step 703, obtaining an average value of the luminance values of the pixels in each of the first target compensation sub-regions, and a luminance value of a central pixel of the display panel.
In the embodiment of the present invention, after the Mura region is divided into a plurality of first target compensation sub-regions, the luminance compensation device first obtains the luminance value of each pixel in each first target compensation sub-region, calculates the average value of the luminance values of all pixels in each first target compensation sub-region, and obtains the luminance value of the center pixel of the display panel, where the average value of the luminance values of all pixels in each first target compensation sub-region and the luminance value of the center pixel of the display panel are used to subsequently determine the first luminance compensation value corresponding to each first target compensation sub-region.
Step 704, taking the difference between the average value and the brightness value of the central pixel as a first brightness compensation value corresponding to the first target compensation sub-region, so as to perform brightness compensation on the first target compensation sub-region through the first brightness compensation value.
In the embodiment of the present invention, after obtaining the average value of the luminance values of the pixels in each of the first target compensation sub-areas and the luminance value of the center pixel of the display panel, calculating the difference between the average value of the brightness values of the pixels in each first target compensation sub-region and the brightness value of the central pixel of the display panel, using the difference as the first brightness compensation value corresponding to the corresponding first target compensation sub-region, after obtaining the first brightness compensation value, the brightness compensation device stores a first brightness compensation value and the position of a first target compensation sub-region corresponding to the first brightness compensation value in the display panel into a compensation table, the compensation table also stores the format of the first target compensation subarea and the gray scale corresponding to the display picture when the brightness of the display panel is acquired, and the brightness compensation device generates the compensation table and stores the compensation table in the storage unit of the display panel.
When brightness compensation is needed to be performed on a Mura area in a display panel, a compensation table located in a storage unit in the display panel is loaded by a Tcon (Timer Control Register, central Control board), a first brightness compensation value corresponding to a first target compensation sub-area is extracted according to the position of the first target compensation sub-area in the compensation table in the display panel and the gray scale of a current display picture in the display panel, and brightness compensation is performed on the first target compensation sub-area by using the first brightness compensation value, so that the Mura phenomenon in the first target compensation sub-area is eliminated, and further the Mura phenomenon located in the Mura area in the display panel is eliminated.
Step 705, performing region division on the non-Mura regions in the display panel to obtain a plurality of second target compensation sub-regions; the non-Mura region is a region except the Mura region in the display area of the display panel.
In the embodiment of the present invention, the display panel further includes a non-Mura region, where the non-Mura region is a region other than the Mura region in the display region of the display panel, and after the Mura region in the display panel is determined, the non-Mura region in the display panel can be determined.
In the conventional dividing method, the non-Mura region is also composed of a plurality of original compensation sub-regions in a format of a1 × b1, and in the embodiment of the present invention, after the non-Mura region in the display panel is determined, the non-Mura region is subjected to region division to obtain a plurality of second target compensation sub-regions.
The number of the second target compensation sub-regions in each row is less than that of the original compensation sub-regions in the corresponding row, which are located in the non-Mura region, and the number of the second target compensation sub-regions in each column is less than that of the original compensation sub-regions in the corresponding column, which are located in the non-Mura region; and the number of pixels in the row direction in each second target compensation sub-area is greater than the number of pixels in the row direction in the original compensation sub-area, and the number of pixels in the column direction in each second target compensation sub-area is greater than the number of pixels in the column direction in the original compensation sub-area.
Specifically, the non-Mura region is subjected to region division, the number of the second target compensation sub-regions in each row of the divided non-Mura region is smaller than the number of the original compensation sub-regions in each row of the non-Mura region in the existing division manner, the number of the second target compensation sub-regions in each column of the divided non-Mura region is smaller than the number of the original compensation sub-regions in each column of the non-Mura region in the existing division manner, and since the range of the non-Mura region is not changed, when the number of the second target compensation sub-regions in each row and each column is reduced, the format of each second target compensation sub-region is changed compared with the format of each original compensation sub-region.
For example, the format of the original compensation sub-region is a1 × B1, that is, the original compensation sub-region includes a1 rows and B1 columns of pixels, the format of the second target compensation sub-region is a2 × B2, that is, the second target compensation sub-region includes a2 rows and B2 columns of pixels, then a2 is greater than a1, and B2 is greater than B1, where a2 and B2 are positive integers greater than or equal to 1.
For example, taking the example of fig. 3 that includes both the Mura area 31 and the Mura area 32, the first target compensation sub-area of the Mura area 31 according to the 8 × 2 format is divided into areas, then the first target compensation sub-area of the Mura area 32 according to the 2 × 8 format is divided into areas, as shown in fig. 4, the region where the Mura region 31 and the Mura region 32 overlap each other is divided into first target compensation sub-regions in a2 x 2 format, and at this time, dividing the non-Mura region in the display panel into 8 × 8 format second target compensation sub-regions, wherein the total number of the first target compensation sub-regions and the second target compensation sub-regions divided by the whole display panel is 15 × 24, in fig. 1, the Mura region 31 and the Mura region 32, as well as the non-Mura region, are each divided into regions according to the original compensation sub-regions in the 4 × 4 format, and the total number of the divided original compensation sub-regions of the entire display panel is 18 × 36. It can be seen that the total number of the first target compensation sub-region and the second target compensation sub-region after the display panel is divided by the embodiment of the invention is less than that of the original compensation sub-region, so that the efficiency of the subsequent brightness compensation of the display panel is improved, and the requirement on the storage space and the storage amount of the storage space is also reduced. In addition, the phenomenon that each first target compensation subregion comprises both Mura regions and non-Mura regions does not occur, so that the subsequent brightness compensation of the display panel is facilitated to eliminate the Mura phenomenon in the display panel.
Step 706, obtaining a second brightness compensation value corresponding to each second target compensation sub-region, so as to perform brightness compensation on pixels in the second target compensation sub-region through the second brightness compensation value.
In the embodiment of the present invention, after the non-Mura region is divided into a plurality of second target compensation sub-regions, a luminance value of each pixel in each second target compensation sub-region is obtained, an average value of luminance values of pixels in each second target compensation sub-region is obtained, a luminance value of a center pixel of the display panel is obtained, a difference value between the average value of luminance values of pixels in each second target compensation sub-region and the luminance value of the center pixel of the display panel is obtained, and the difference value is used as a second luminance compensation value corresponding to the corresponding second target compensation sub-region. After the second brightness compensation value is obtained, the second brightness compensation value and the position of the second target compensation sub-region corresponding to the second brightness compensation value in the display panel are stored into a compensation table, the format of the second target compensation sub-region is also stored in the compensation table, and the compensation table is stored in a storage unit of the display panel.
When brightness compensation needs to be performed on a non-Mura region in the display panel, Tcon loads a compensation table in a storage unit in the display panel, extracts a second brightness compensation value corresponding to a second target compensation sub-region according to the position of the second target compensation sub-region in the compensation table in the display panel and a gray scale corresponding to a display picture when the brightness of the display panel is obtained, and performs brightness compensation on the second target compensation sub-region by using the second brightness compensation value, so that the brightness of the whole display panel is homogenized.
It should be noted that, in the above steps, step 702 to step 704 may be executed first, and then step 705 to step 706 are executed, or step 705 to step 706 may be executed first, and then step 702 to step 704 are executed.
In the embodiment of the invention, firstly, the Mura area in the display panel is divided, when the Mura area is distributed along the row direction of the display panel, the number of rows of the Mura area is increased, so that the number of pixels of the first target compensation sub-area in the column direction is reduced, and the phenomenon of uneven brightness of the first target compensation sub-area in the column direction can be reduced; when the Mura regions are distributed along the column direction of the display panel, the number of columns of the Mura regions is increased, so that the number of pixels of the first target compensation sub-region in the row direction is reduced, and the phenomenon of uneven brightness of the first target compensation sub-region in the row direction can be reduced; secondly, when the Mura area is distributed along the row direction of the display panel, although the number of rows of the first target compensation sub-area in the Mura area is increased, the number of columns of the first target compensation sub-area in the Mura area is reduced at the same time, or when the Mura area is distributed along the column direction of the display panel, although the number of columns of the first target compensation sub-area in the Mura area is increased, the number of rows of the first target compensation sub-area in the Mura area is reduced at the same time, therefore, when the Mura area is compensated more finely, the work efficiency of compensating the Mura area is not influenced, and the storage space of the display panel is not influenced; and thirdly, after the non-Mura region in the display panel is subjected to region division, the number of the obtained second target compensation sub-regions is smaller than that of the original compensation sub-regions in the non-Mura region, so that the subsequent brightness compensation efficiency of the display panel is improved, and the storage space occupied by a second brightness compensation value for performing brightness compensation on the second target compensation sub-regions in the display panel can be reduced.
EXAMPLE III
Fig. 10 is a block diagram illustrating a structure of a luminance compensation apparatus according to an embodiment of the present invention.
The brightness compensation device 1000 is applied to a display panel, and includes:
a Mura region determining module 1001 configured to determine a Mura region in a display area of the display panel;
a Mura region dividing module 1002, configured to perform region division on the Mura region to obtain M rows and N columns of first target compensation sub-regions; both M and N are positive integers greater than 1;
a first brightness compensation value obtaining module 1003 configured to obtain a first brightness compensation value corresponding to each first target compensation sub-region, so as to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value;
when the Mura region is distributed along the row direction of the display panel, the M is larger than the row number of an original compensation sub-region in the Mura region, and the number of pixels in the column direction of each first target compensation sub-region is smaller than the number of pixels in the column direction of the original compensation sub-region; when the Mura regions are distributed along the column direction of the display panel, the N is greater than the column number of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction of each first target compensation sub-region is less than the number of pixels in the row direction of the original compensation sub-region; the original compensation sub-area is a sub-area obtained by dividing the display area according to an originally fixed dividing mode.
Optionally, when the Mura regions are distributed along the row direction of the display panel, the N is smaller than the number of columns of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction in each first target compensation sub-region is greater than the number of pixels in the row direction in the original compensation sub-region;
when the Mura regions are distributed along the column direction of the display panel, the M is less than the number of rows of the original compensation sub-regions in the Mura regions, and the number of pixels in the column direction in each first target compensation sub-region is greater than the number of pixels in the column direction in the original compensation sub-region.
Optionally, the brightness compensation apparatus 1000 further includes:
the non-Mura region dividing module is configured to perform region division on the non-Mura regions in the display panel to obtain a plurality of second target compensation sub-regions; the non-Mura region is a region except the Mura region in a display area of the display panel;
a second brightness compensation value obtaining module configured to obtain a second brightness compensation value corresponding to each second target compensation sub-region, so as to perform brightness compensation on pixels in the second target compensation sub-region through the second brightness compensation value;
wherein the number of the second target compensation sub-regions in each row is less than the number of the original compensation sub-regions in the corresponding row located in the non-Mura region, and the number of the second target compensation sub-regions in each column is less than the number of the original compensation sub-regions in the corresponding column located in the non-Mura region; and the number of pixels in the row direction of each second target compensation sub-area is greater than that in the original compensation sub-area, and the number of pixels in the column direction of each second target compensation sub-area is greater than that in the original compensation sub-area.
Optionally, the Mura area determining module 1001 includes:
an original image acquisition sub-module configured to acquire an original image corresponding to the display panel;
a brightness coordinate curve obtaining sub-module configured to extract a brightness coordinate curve of the original image;
a Mura region first determining submodule configured to determine a Mura region in a display area of the display panel according to the luminance coordinate curve.
Optionally, the first determining sub-module of the Mura region includes:
a luminance value acquisition unit configured to acquire a luminance value of each pixel in the luminance coordinate curve;
a difference calculation unit configured to calculate a difference between a luminance value of each of the pixels and a luminance value of a center pixel in the original image;
a Mura region determining unit configured to determine, as the Mura region, a region where a pixel where a ratio of the difference to the luminance value of the center pixel is larger than a preset threshold is located.
Optionally, the Mura area determining module 1001 includes:
the splicing area determining submodule is configured to determine an area corresponding to the splicing position of the mask plate as a splicing area of the display panel when the display panel is manufactured by adopting the mask plate to carry out splicing exposure;
and the Mura region second determining submodule is configured to determine a Mura region in the display area of the display panel according to the splicing region.
Optionally, the first luminance compensation value obtaining module 1003 includes:
a luminance value obtaining module configured to obtain an average value of luminance values of the pixels in each of the first target compensation sub-regions and a luminance value of a center pixel of the display panel;
and the first brightness compensation value acquisition module is configured to take the difference value between the average value and the brightness value of the central pixel as a first brightness compensation value corresponding to the first target compensation sub-region, so as to perform brightness compensation on the first target compensation sub-region through the first brightness compensation value.
In the embodiment of the present invention, by determining the Mura area in the display panel, when the Mura area is distributed along the row direction of the display panel, the number of rows of the first target compensation sub-areas obtained by division is increased to reduce the number of pixels of each first target compensation sub-area in the column direction, thereby reducing the phenomenon of uneven brightness of the pixels in each first target compensation sub-area in the column direction, when the Mura area is distributed along the column direction of the display panel, when the Mura area is divided, the number of columns of the first target compensation sub-areas obtained by division is increased to reduce the number of pixels of each first target compensation sub-area in the row direction, thereby reducing the phenomenon of uneven brightness of the pixels in each first target compensation sub-area in the row direction, therefore, after compensating the pixels in each first target compensation sub-area, the Mura phenomenon in the Mura area can be reduced.
The embodiment of the present invention further provides a luminance compensation device, which includes a processor, a memory, and a computer program stored in the memory and capable of running on the processor, and when being executed by the processor, the computer program implements each process of the above-mentioned luminance compensation method embodiment, and can achieve the same technical effect, and is not described herein again to avoid repetition.
The brightness compensation device is a Demura device, and the brightness compensation device is positioned in the Demura device.
The embodiment of the present invention further provides a readable storage medium, where a program or an instruction is stored on the readable storage medium, and when the program or the instruction is executed by a processor, the program or the instruction implements the processes of the embodiment of the brightness compensation method, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.
While, for purposes of simplicity of explanation, the foregoing method embodiments have been described as a series of acts or combination of acts, it will be appreciated by those skilled in the art that the present invention is not limited by the illustrated ordering of acts, as some steps may occur in other orders or concurrently with other steps in accordance with the invention. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The method, the apparatus, the device and the readable storage medium for brightness compensation provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the description of the above examples is only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (10)

1. A brightness compensation method is applied to a display panel, and comprises the following steps:
determining a Mura region in a display area of the display panel;
performing region division on the Mura region to obtain M rows and N columns of first target compensation subregions; both M and N are positive integers greater than 1;
acquiring a first brightness compensation value corresponding to each first target compensation sub-region, so as to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value;
when the Mura region is distributed along the row direction of the display panel, the M is larger than the row number of an original compensation sub-region in the Mura region, and the number of pixels in the column direction of each first target compensation sub-region is smaller than the number of pixels in the column direction of the original compensation sub-region; when the Mura regions are distributed along the column direction of the display panel, the N is greater than the column number of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction of each first target compensation sub-region is less than the number of pixels in the row direction of the original compensation sub-region; the original compensation subarea is a subarea obtained by dividing the display area according to an original fixed dividing mode; and the phenomenon that both Mura regions and non-Mura regions are included does not occur in each first target compensation subregion.
2. The method of claim 1, wherein when the Mura regions are distributed along the row direction of the display panel, the N is less than the number of columns of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction in each of the first target compensation sub-regions is greater than the number of pixels in the row direction in the original compensation sub-region;
when the Mura regions are distributed along the column direction of the display panel, the M is less than the number of rows of the original compensation sub-regions in the Mura regions, and the number of pixels in the column direction in each first target compensation sub-region is greater than the number of pixels in the column direction in the original compensation sub-region.
3. The method of claim 1, further comprising, after the step of determining a Mura region in a display area of the display panel:
performing region division on a non-Mura region in the display panel to obtain a plurality of second target compensation sub-regions; the non-Mura region is a region except the Mura region in a display area of the display panel;
acquiring a second brightness compensation value corresponding to each second target compensation sub-region, so as to perform brightness compensation on pixels in the second target compensation sub-region through the second brightness compensation value;
wherein the number of the second target compensation sub-regions in each row is less than the number of the original compensation sub-regions in the corresponding row located in the non-Mura region, and the number of the second target compensation sub-regions in each column is less than the number of the original compensation sub-regions in the corresponding column located in the non-Mura region; and the number of pixels in the row direction of each second target compensation sub-area is greater than that in the original compensation sub-area, and the number of pixels in the column direction of each second target compensation sub-area is greater than that in the original compensation sub-area.
4. The method of claim 1, wherein the step of determining a Mura region in a display area of the display panel comprises:
acquiring an original image corresponding to the display panel;
extracting a brightness coordinate curve of the original image;
and determining a Mura area in a display area of the display panel according to the brightness coordinate curve.
5. The method of claim 4, wherein the step of determining a Mura region in a display area of the display panel according to the luminance coordinate curve comprises:
acquiring the brightness value of each pixel in the brightness coordinate curve;
calculating a difference between the brightness value of each pixel and the brightness value of the central pixel in the original image;
and determining the area where the pixel with the ratio of the difference value to the brightness value of the central pixel larger than a preset threshold value is located as the Mura area.
6. The method of claim 1, wherein the step of determining a Mura region in a display area of the display panel comprises:
when a mask plate is adopted for splicing exposure to manufacture the display panel, determining a region corresponding to the splicing position of the mask plate as a splicing region of the display panel;
and determining a Mura area in a display area of the display panel according to the splicing area.
7. The method according to claim 1, wherein the step of obtaining a first brightness compensation value corresponding to each first target compensation sub-region to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value comprises:
acquiring an average value of luminance values of the pixels in each first target compensation sub-region and a luminance value of a central pixel of the display panel;
and taking the difference value between the average value and the brightness value of the central pixel as a first brightness compensation value corresponding to the first target compensation sub-region, so as to perform brightness compensation on the first target compensation sub-region through the first brightness compensation value.
8. A brightness compensation device applied to a display panel, the device comprising:
a Mura region determination module configured to determine a Mura region in a display area of the display panel;
the Mura region dividing module is configured to perform region division on the Mura region to obtain M rows and N columns of first target compensation sub-regions; both M and N are positive integers greater than 1;
a first brightness compensation value obtaining module configured to obtain a first brightness compensation value corresponding to each first target compensation sub-region, so as to perform brightness compensation on pixels in the first target compensation sub-region through the first brightness compensation value;
when the Mura region is distributed along the row direction of the display panel, the M is larger than the row number of an original compensation sub-region in the Mura region, and the number of pixels in the column direction of each first target compensation sub-region is smaller than the number of pixels in the column direction of the original compensation sub-region; when the Mura regions are distributed along the column direction of the display panel, the N is greater than the column number of the original compensation sub-regions in the Mura regions, and the number of pixels in the row direction of each first target compensation sub-region is less than the number of pixels in the row direction of the original compensation sub-region; the original compensation subarea is a subarea obtained by dividing the display area according to an original fixed dividing mode; and the phenomenon that both Mura regions and non-Mura regions are included does not occur in each first target compensation subregion.
9. An illumination compensation device, characterized by a processor, a memory and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, carries out the steps of the illumination compensation method as claimed in any one of claims 1 to 7.
10. A readable storage medium, on which a program or instructions are stored, which, when executed by a processor, carry out the steps of the brightness compensation method according to any one of claims 1 to 7.
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