CN112767891B - Mura compensation method, display panel and display device - Google Patents
Mura compensation method, display panel and display device Download PDFInfo
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—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 by control of light from an independent source
- G09G3/36—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 by control of light from an independent source using liquid crystals
- G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
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Abstract
The embodiment of the application provides a mura compensation method, a display panel and a display device, wherein the mura compensation method comprises the following steps: acquiring mura compensation data of a plurality of sub-pixels of a display panel under a plurality of viewing angles, wherein the mura compensation data comprise first compensation data under a plurality of side viewing angles and second compensation data under a front viewing angle; calculating compensation gain values for a plurality of partitions of the display panel at a plurality of the side viewing angles according to the first compensation data at the plurality of the side viewing angles and the second compensation data at the front viewing angle, wherein each partition comprises a plurality of the sub-pixels; performing mura compensation on the display panel according to the second compensation data under the front viewing angle and the compensation gain values under the plurality of side viewing angles; the embodiment of the application further improves the mura condition of the display panel under different side viewing angles while effectively reducing demura data, and further saves the cost brought by the storage device in the production process.
Description
Technical Field
The application relates to the technical field of display, in particular to a mura compensation method, a display panel and a display device.
Background
With the development of LCD (liquid crystal display) toward lighter, thinner and larger, due to some uncontrollable factors in the actual process, the physical characteristics of the LCD display panel are different, resulting in a phenomenon of uneven brightness when displaying a pure gray image in a range larger than one pixel point, which is referred to in the industry as Mura phenomenon. DeMura (luminance unevenness compensation) is actually a process of compensating for Mura. The method comprises the steps of obtaining in-plane Mura information from the brightness of a panel picture shot by a camera, extracting and correcting Mura through algorithms, and finally obtaining a compensation Table (DeMura Table) for hardware (such as a processor) interpolation calling. Generally, the acquisition of the Mura information is completed by a camera, a personal computer is used for processing the information to obtain a compensation table, and finally the compensation table is burnt in a storage device (for example, Flash).
At present, the existing 8k liquid crystal display screen is produced on an 8.5 generation production line, and because CF (color filter) photomask splicing is adopted, mura (uneven brightness) phenomenon is inevitably existed in a CF photomask splicing area. The current mura compensation method does not consider the splicing mura condition caused by light shield splicing, the compensation effect is not ideal, the image transition of the liquid crystal display screen is not smooth, and chromatic aberration exists, as shown in figure 1; and after the splicing Mura compensation, the corresponding Mura at the side view angle is inconsistent. If multiple sets of side-view demura data are used, the performance of the device is reduced (the programming time is increased), and the cost of the memory device is increased.
Therefore, how to reduce demura data to save the cost of the storage device in production is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The embodiment of the application provides a mura compensation method, a display panel and a display device, which can further save the cost brought by storage equipment in the production process while improving the mura condition of the display panel under different side view angles.
The embodiment of the application provides a mura compensation method, which comprises the following steps:
s10, acquiring mura compensation data of a plurality of sub-pixels of the display panel under a plurality of viewing angles, wherein the mura compensation data comprise first compensation data under a plurality of side viewing angles and second compensation data under a front viewing angle;
s20, calculating compensation gain values of a plurality of partitions of the display panel at a plurality of side viewing angles according to the first compensation data at the plurality of side viewing angles and the second compensation data at the front viewing angle, wherein each partition comprises a plurality of sub-pixels;
s30, performing mura compensation on the display panel according to the second compensation data at the front viewing angle and the compensation gain values at the side viewing angles.
Optionally, in some embodiments of the present application, the S10 includes acquiring mura information of the plurality of sub-pixels of the display panel at a plurality of viewing angles through a plurality of sets of optical systems to acquire the mura compensation data, where the optical systems are measurement cameras.
Optionally, in some embodiments of the present application, the S10 further includes:
s101, obtaining mura compensation data of a plurality of preset gray scales of the display panel under different viewing angles;
s102, carrying out linear interpolation on the mura compensation data of the preset gray scales to obtain the mura compensation data of each gray scale.
Optionally, in some embodiments of the present application, in S20, the amount of compensation data in each of the partitions of the display panel is the same.
Optionally, in some embodiments of the present application, in S20, the step of calculating the compensation gain value further includes:
s201, in each partition of the display panel, calculating an average value of a plurality of compensation data corresponding to the first compensation data under a plurality of side viewing angles under a specific gray scale to obtain a first compensation average value;
s202, in the same partition of the display panel, calculating an average value of a plurality of compensation data corresponding to the second compensation data under the positive viewing angle under the specific gray scale to obtain a second compensation average value;
wherein a ratio of the first compensation average to the second compensation average is the compensation gain value in each of the partitions.
Optionally, in some embodiments of the present application, the S30 further includes: and performing mura compensation on the display panel under different side viewing angles by adopting the product of the second compensation data under the positive viewing angle and the corresponding compensation gain value.
Optionally, in some embodiments of the present application, before performing the S30, the method further includes: storing the second compensation data and the compensation gain value using a flash memory device.
Optionally, in some embodiments of the present application, the display panel includes a splicing area and a non-splicing area, and the plurality of partitions of the display panel at least cover the splicing area.
Correspondingly, the embodiment of the present application further provides a display panel, including: a memory for storing instructions and a controller for executing the instructions to implement a method as claimed in any preceding claim.
Correspondingly, the embodiment of the application further provides a display device, which comprises the display panel.
The mura compensation method, the display panel and the display device provided by the embodiment of the application convert the demura data partitions of the display panel at different side viewing angles into compensation gain values corresponding to the demura data at the front viewing angle, effectively reduce the demura data, further improve the mura conditions of the display panel at different side viewing angles, and further save the cost brought by the storage device in the production process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a prior art 8k LCD screen with tiled mura;
FIG. 2 is a schematic diagram of a system for acquiring demura at different viewing angles according to an embodiment of the present disclosure;
FIG. 3 is a flow chart of a mura compensation method provided by an embodiment of the present application;
FIG. 4 is a block flow diagram of a mura compensation method provided by an embodiment of the present application.
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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a mura compensation method, a display panel and a display device. The following are detailed below. It should be noted that the following description of the embodiments is not intended to limit the preferred order of the embodiments. In addition, in the description of the present application, the term "including" means "including but not limited to". The terms first, second, third and the like are used merely as labels, and do not impose numerical requirements or an established order. Various embodiments of the invention may exist in a range of versions; it is to be understood that the description in the form of a range is merely for convenience and brevity and should not be construed as an inflexible limitation on the scope of the invention; accordingly, the described range descriptions should be considered to have specifically disclosed all the possible sub-ranges as well as individual numerical values within that range. For example, it is contemplated that the description of a range from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as individual numbers within a range of numbers, such as 1, 2, 3, 4, 5, and 6, for example, regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any number (fractional or integer) recited within the indicated range.
Please refer to fig. 2, which is a schematic diagram illustrating a system for acquiring demura with different viewing angles according to an embodiment of the present disclosure. In the embodiment, a plurality of sets of optical systems 2 are used for simultaneously collecting mura information of different viewing angles of the display screen 1. The number of the optical systems 2 used depends on the fineness of the angle of view to be compensated. The main control computer 3 is used for controlling the display of the display screen, acquiring mura data, generating a demura LUT (look up table), generating a side view angular partition gain, writing the demura LUT, and writing each side view angular partition gain.
Alternatively, in some embodiments of the present application, the generation of the demura LUT may be generated using known general means.
Please refer to fig. 3, which is a flowchart illustrating a mura compensation method according to an embodiment of the present disclosure. Wherein the method comprises the following steps:
and S10, acquiring mura compensation data of a plurality of sub-pixels of the display panel under a plurality of viewing angles, wherein the mura compensation data comprise first compensation data under a plurality of side viewing angles and second compensation data under a front viewing angle.
Specifically, the S10 further includes:
firstly, acquiring mura compensation data of a plurality of preset gray scales of the display panel under different viewing angles; then, carrying out linear interpolation on the mura compensation data of a plurality of preset gray scales to obtain the mura compensation data of each gray scale; wherein the mura compensation data includes first compensation data at a plurality of side viewing angles and second compensation data at a front viewing angle.
Optionally, in some embodiments of the present application, the mura information of the display panel at different viewing angles is collected simultaneously by multiple sets of optical systems, and the optical systems are measuring cameras.
Specifically, in order to reduce the data storage amount, mura compensation data corresponding to a plurality of predetermined gray scales for displaying the display panel, such as mura compensation data of gray scale 25, gray scale 60 and gray scale 225, are measured by the measuring camera, and mura compensation data of other gray scales are obtained by storing mura compensation data of predetermined gray scales, for example, a linear interpolation manner is adopted to obtain mura compensation data of gray scale 50 according to gray scale 25 and gray scale 60.
For example, the mura compensation data of each gray level is obtained by linear interpolation according to the gray levels 25, 60, 225 and 0, 255. It is understood that the minimum and maximum values of the mura compensation data are gray levels 0 and 255, respectively, and the mura compensation data are fixed, while those of the gray levels 225, 60 and 25 are measured by the measuring camera.
Optionally, in some embodiments of the present application, the corresponding linear interpolation formula is:
namely: y is a × y1+ b × y 2; wherein, a is (x1-x)/(x1-x0), and b is (x-x0)/(x1-x 0). Wherein x1 and x0 represent adjacent gray levels, y1 and y0 represent mura compensation data corresponding to the gray levels, and x represents the sum of each gray level.
From the above, it can be obtained: non-linear interpolation can be achieved as long as the values of a and b are non-linearly changed.
Further, when the mura compensation data of a plurality of predetermined gray levels of the display panel measured by the measuring camera is acquired, the mura compensation data is compressed at the interval of M × N (M, N are each an integer greater than 1, for example, 8 × 8) pixels and stored in the memory.
S20, calculating compensation gain values of a plurality of partitions of the display panel at a plurality of side viewing angles according to the first compensation data at the plurality of side viewing angles and the second compensation data at the front viewing angle, wherein each partition comprises a plurality of sub-pixels.
Specifically, the S20 further includes:
firstly, generating original compensation lookup tables under different viewing angles according to mura compensation data of different viewing angles, and partitioning display areas corresponding to the compensation data of the original compensation lookup tables, wherein each partition comprises a plurality of sub-pixels, and the compensation data amount of each partition is the same; then, in each partition of the display panel, calculating an average value of a plurality of compensation data corresponding to the first compensation data under a plurality of side viewing angles under a specific gray scale to obtain a first compensation average value; then, in the same partition of the display panel, calculating an average value of the second compensation data under the positive viewing angle corresponding to a plurality of compensation data under a specific gray scale to obtain a second compensation average value, wherein a ratio of the first compensation average value to the second compensation average value is the compensation gain value in each partition.
S30, performing mura compensation on the display panel according to the second compensation data at the front viewing angle and the compensation gain values at the side viewing angles.
Specifically, the S30 further includes:
firstly, using a flash memory device to store the second compensation data and the compensation gain value; and then carrying out mura compensation on the display panel according to the second compensation data and the compensation gain value.
Further, the second compensation data is multiplied by the corresponding compensation gain value to carry out mura compensation on the display panel under different side viewing angles. In each partition of the display panel, the mura compensation data under the side view angle can be obtained by multiplying the mura compensation data (second compensation data) under the front view angle by the corresponding compensation gain value, so that the total mura compensation data amount is reduced, the mura conditions of the display panel under different side view angles are further improved, and the cost brought by storage equipment in the production process is further saved.
Optionally, in some embodiments of the present application, the display panel includes a splicing area and a non-splicing area, and the plurality of partitions of the display panel at least cover the splicing area, so that the compensation is more comprehensive and has no leakage.
Optionally, in some embodiments of the present application, in S30, only the display sections corresponding to the splicing area may be partitioned, where each of the partitions includes first compensation data at different side view angles and second compensation data corresponding to the first compensation data at a front view angle.
Compensating the non-splicing area of the display image by adopting mura compensation data corresponding to the non-splicing area in the original compensation lookup table; and compensating the splicing area of the display image by adopting the second compensation data and the compensation gain value corresponding to the second compensation data. Therefore, the mura compensation data volume of the splicing area of the display image is reduced, the mura conditions of the splicing area of the display panel under different side viewing angles are further improved, and the cost brought by storage equipment in the production process is further saved.
Fig. 4 is a block flow diagram of a mura compensation method provided in an embodiment of the present application. The total mura compensation method comprises the following flows:
first, mura compensation data for each view angle is photographed by a measurement camera: m1, M2, M3 … ….
Specifically, in order to reduce the data storage amount, mura compensation data corresponding to a plurality of predetermined gray scales for displaying the display panel, such as mura compensation data of gray scale 25, gray scale 60 and gray scale 225, are measured by the measuring camera, and mura compensation data of other gray scales are obtained by storing mura compensation data of predetermined gray scales, for example, a linear interpolation manner is adopted to obtain mura compensation data of gray scale 50 according to gray scale 25 and gray scale 60.
Next, the Mura compensation data is divided into X × Y (X is the number of rows, and Y is the number of columns) and the gray level gain (compensation gain) value of each partition is calculated.
Specifically, the original compensation lookup tables at different viewing angles are generated according to the mura compensation data at different viewing angles. And then, dividing the display area corresponding to the compensation data of the original compensation lookup table, wherein the compensation data of each division comprises first compensation data under different side viewing angles and second compensation data corresponding to the first compensation data under a front viewing angle. And calculating compensation gain values corresponding to the first compensation data under a plurality of gray scales respectively.
The method for calculating the compensation gain value comprises the following steps:
in each partition of the display panel, calculating the sum of a plurality of compensation data corresponding to the first compensation data under a specific gray scale, and taking the average value corresponding to each first compensation data to obtain a first compensation average value; and then, calculating the sum of a plurality of compensation data corresponding to the second compensation data corresponding to the first compensation data under a specific gray scale, and taking the average value corresponding to each second compensation data to obtain a second compensation average value. Then, the ratio of the first compensation average value to the second compensation average value is the compensation gain value.
Finally, the Mura compensation data of the positive viewing angle and the gain of each side viewing angle are burned into a demura flash (flash memory device for storing the compensation data).
Specifically, the second compensation data and the compensation gain value are first stored using a flash memory device; and then carrying out mura compensation on the display panel according to the second compensation data and the compensation gain value.
Further, the second compensation data is multiplied by the corresponding compensation gain value to carry out mura compensation on the display panel under different side viewing angles. In each partition of the display panel, the mura compensation data under the side viewing angle can be obtained by multiplying the mura compensation data (second compensation data) under the front viewing angle by the corresponding compensation gain value, so that the total mura compensation data amount is reduced, the mura conditions of the display panel under different side viewing angles are further improved, and the cost brought by storage equipment in the production process is further saved.
Correspondingly, the embodiment of the present application further provides a display panel, including: a memory for storing instructions and a controller for executing the instructions to implement the mura compensation method described above.
Correspondingly, the embodiment of the application also provides a display device, and the display device comprises the display panel of the embodiment.
The display device may be a mobile phone, a computer, a television, an intelligent wearable display device, and the like, which is not particularly limited in this embodiment.
To sum up, the mura compensation method, the display panel and the display device provided by the embodiment of the application convert the demura data of the display panel at different side view angles into the compensation gain values corresponding to the demura data at the front view angle in a partitioning manner, so that while the demura data are effectively reduced, the mura conditions of the display panel at different side view angles are further improved, and the cost brought by storage equipment in the production process is further saved.
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 mura compensation method, the display panel and the display device provided by the embodiments of the present application are described in detail above, and specific examples are applied herein to illustrate the principles and embodiments of the present application, and the description of the above embodiments is only used to help understand the method and the core ideas of the present application; meanwhile, for those skilled in the art, according to the idea of the present application, 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 application.
Claims (9)
1. A mura compensation method, comprising:
s10, acquiring mura compensation data of a plurality of sub-pixels of the display panel under a plurality of viewing angles, wherein the mura compensation data comprise first compensation data under a plurality of side viewing angles and second compensation data under a front viewing angle;
s20, calculating compensation gain values of a plurality of partitions of the display panel at a plurality of side viewing angles according to the first compensation data at the plurality of side viewing angles and the second compensation data at the front viewing angle, wherein each partition comprises a plurality of sub-pixels, and the calculating the compensation gain values further comprises:
s201, in each partition of the display panel, calculating an average value of a plurality of compensation data corresponding to the first compensation data under a plurality of side viewing angles under a specific gray scale to obtain a first compensation average value;
s202, in the same partition of the display panel, calculating an average value of a plurality of compensation data corresponding to the second compensation data under the positive viewing angle under the specific gray scale to obtain a second compensation average value;
wherein, the ratio of the first compensation average value to the second compensation average value is the compensation gain value in each partition;
s30, performing mura compensation on the display panel according to the second compensation data at the front viewing angle and the compensation gain values at the side viewing angles.
2. The mura compensation method of claim 1, wherein the S10 comprises acquiring mura information of a plurality of sub-pixels of the display panel at a plurality of viewing angles through a plurality of sets of optical systems to obtain the mura compensation data, the optical systems being measurement cameras.
3. The mura compensation method according to claim 1, wherein the S10 further comprises:
s101, obtaining mura compensation data of a plurality of preset gray scales of the display panel under different viewing angles;
s102, carrying out linear interpolation on the mura compensation data of the preset gray scales to obtain the mura compensation data of each gray scale.
4. The mura compensation method according to claim 1, wherein in the S20, the amount of compensation data in each of the partitions of the display panel is the same.
5. The mura compensation method according to claim 1, wherein the S30 further comprises: and performing mura compensation on the display panel under different side viewing angles by adopting the product of the second compensation data under the positive viewing angle and the corresponding compensation gain value.
6. The mura compensation method according to claim 1, further comprising, before performing the S30: storing the second compensation data and the compensation gain value using a flash memory device.
7. The mura compensation method of claim 1 wherein the display panel comprises a tiled area and a non-tiled area, and wherein the plurality of sections of the display panel at least cover the tiled area.
8. A display panel, comprising:
a memory to store instructions;
a controller for executing the instructions to implement the method of any one of claims 1-7.
9. A display device comprising the display panel according to claim 8.
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| CN113362751B (en) * | 2021-06-01 | 2023-11-28 | 深圳市华星光电半导体显示技术有限公司 | Data compensation method and data compensation device of display panel |
| CN114170945B (en) * | 2021-12-12 | 2023-07-25 | Tcl华星光电技术有限公司 | Display compensation method and display |
| CN118098144B (en) * | 2024-04-24 | 2024-06-21 | 深圳市华星光电半导体显示技术有限公司 | Luminance matching method and device for display screen and display device |
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