CN112927640B - Data compression method and storage device for locally compensating uneven brightness of display picture - Google Patents
Data compression method and storage device for locally compensating uneven brightness of display picture Download PDFInfo
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
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- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
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Abstract
A data compression method capable of compensating uneven brightness of a display picture locally, wherein the display picture is divided into a plurality of picture blocks, the method comprises the following steps: capturing uneven brightness (Mura) data of a plurality of picture blocks of a display picture; calculating the brightness non-uniformity (Mura) compensation value of a plurality of picture blocks of the display picture according to the extracted Mura data; calculating the variation degree of the brightness non-uniformity (Mura) compensation value of each picture block of the display picture according to the Mura compensation values of a plurality of picture blocks of the display picture; selecting a data compression mode of each picture block of the display picture according to the variation degree of the Mura compensation value of each picture block of the display picture; and compressing the Mura compensation value of each picture block of the display picture in a corresponding compression mode to obtain a compressed brightness non-uniformity (Mura) compensation value of each picture block of the display picture.
Description
Technical Field
The present invention relates to a data compression method, and more particularly, to a data compression method for locally compensating for uneven brightness of a display frame and a storage device storing compressed Mura compensation values generated by the method.
Background
For a typical thin film display panel (e.g., LCD, OLED, etc.), a problem in the manufacturing process often causes uneven brightness (Mura) in the display of the panel, which results in the occurrence of bar marks, block marks, sand marks, or any combination of the bar, block, and sand marks on the panel, and therefore, in order to improve the quality of the display of the panel, it is necessary to add a function of removing uneven brightness (Demura) or compensating uneven brightness to the display driving integrated circuit (Display driving IC).
FIG. 1 shows a general structure for compensating for uneven brightness (Demura), which includes the following steps: (A) Capturing uneven brightness (Mura) data 12 of the whole display screen of a display panel 11 by a camera (camera); (B) Calculating a brightness non-uniformity (Mura) compensation value 13 of the display picture according to the acquired brightness non-uniformity data 12 of the display picture; (C) Performing data compression encoding on the Mura compensation value 13 of the display picture to obtain a compressed brightness non-uniformity (Mura) compensation value 14 of the display picture; (D) Storing the compressed Mura compensation values 14 of the display screen in a storage device 15 such as a Flash memory (Flash memory); and (E) the display driving integrated circuit 16 loads the compressed Mura compensation value 14 of the display screen from the storage device 15 to the static random access memory (Static Random Access Memory, SRAM) 161 at the start-up, decompresses the compressed Mura compensation value to restore the Mura compensation value 13 'of the display screen, and then performs brightness compensation (demux) on the display screen of the display panel 11 by using the Mura compensation value 13' of the display screen.
Therefore, the most core technology of the existing Demura architecture is data compression processing and calculation of the Mura compensation value, if the low data compression rate is adopted, a large enough memory (flash memory and static random access memory) is needed to store the uniformity compensation data of the display picture (the Mura compensation value of the compressed display picture), whereas if the high data compression rate is adopted, the memory (flash memory and static random access memory) capacity can be reduced, but if the data compression is too much, the uniformity compensation effect is not good, so that how to balance (Trade-off) between the memory capacity and the uniformity compensation effect is a problem to be solved.
However, in the conventional demux technique, the data compression process of the Mura offset is performed with the same data compression rate on the whole display screen, so that the number of Mura data and Mura offset increases greatly with the increase of panel resolution, which results in not only the increase of the required memory capacity, but also the increase of the cost of the application system and the display driving integrated circuit, and makes it difficult to balance between the memory capacity and the uniformity compensation effect.
Therefore, the existing data compression method for compensating the brightness non-uniformity still has many defects, which are difficult to meet the requirements of the present high resolution display device, and the improvement is still necessary.
Disclosure of Invention
The present invention mainly provides a data compression method capable of locally compensating uneven brightness of a display picture, which adopts different compression multiplying power to compress data according to Mura areas and types of different display pictures, and simultaneously combines the required memory capacity reduction and uniformity compensation effects, so as to effectively solve the defects in the prior art.
According to an aspect of the present invention, a data compression method for locally compensating for brightness non-uniformity of a display frame is provided, wherein the display frame is divided into a plurality of frame blocks, and the method comprises the steps of: (A) Capturing uneven brightness (Mura) data of a plurality of picture blocks of the display picture; (B) Calculating a brightness non-uniformity (Mura) compensation value of a plurality of picture blocks of the display picture according to the extracted Mura data; (C) Calculating the variation degree of the brightness non-uniformity (Mura) compensation value of each picture block of the display picture according to the Mura compensation values of a plurality of picture blocks of the display picture; (D) Selecting a data compression mode of each picture block of the display picture according to the variation degree of the Mura compensation value of each picture block of the display picture; and (E) compressing the Mura compensation value of each picture block of the display picture in a corresponding data compression mode to obtain a compressed brightness non-uniformity (Mura) compensation value of each picture block of the display picture.
According to another aspect of the present invention, a storage device is provided for storing a compressed luminance unevenness (Mura) compensation value generated by the local luminance unevenness data compression method.
The foregoing summary and the following detailed description are exemplary in nature and are intended to further illustrate the invention as claimed, while other objects and advantages of the invention are set forth in the following description and drawings.
Drawings
Fig. 1 schematically shows a technical architecture for compensating for luminance unevenness (Demura) in general.
FIG. 2 is a flow chart of a method for compressing data to partially compensate for uneven brightness of a display screen according to the present invention.
Fig. 3 (a) to 3 (F) schematically show the execution state of the data compression method of the present invention for locally compensating for the luminance unevenness of the display screen.
Symbol description:
uneven brightness data 12 of display panel 11
Brightness unevenness compensation value 13,13'
Compressed luminance unevenness compensation value 14
The storage device 15 displays a driving integrated circuit 16
Static random access memory 161
Steps S201, S203, S205, S207, S209
Display 31 pixel 311
Uneven brightness data 351 of picture block 33
Brightness non-uniformity compensation value 353
Degree of variation 355 of brightness unevenness compensation value
Compression mode 357 compresses luminance unevenness compensation value 359
The storage device 37 displays a driving integrated circuit 39
Sram 391
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Fig. 2 is a flowchart of a data compression method for locally compensating for display screen brightness unevenness according to the present invention, and fig. 3 (a) to 3 (F) schematically show the execution state of the data compression method for locally compensating for display screen brightness unevenness according to the present invention.
Referring to fig. 2 and fig. 3 (a) to 3 (F), the data compression method for locally compensating for uneven brightness of a display screen of the present invention is to perform data compression for uneven brightness removal or compensating for brightness (Demura) on the display screen of the display panel, wherein, as shown in fig. 3 (a), the display screen 31 includes a plurality of pixels 311 arranged in a matrix form, for example, and the display screen 31 is divided into a plurality of non-overlapping screen blocks 33, and each screen block 33 includes a plurality of pixels 311. In the following description of the present embodiment, each pixel 311 includes three sub-pixels, such as a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel, so that the display screen 31 has three sub-pixel channels, such as a red (R) sub-pixel channel, a green (G) sub-pixel channel, and a blue (B) sub-pixel channel.
First, in step S201, for each sub-pixel channel of the display screen 31, taking the uneven brightness (Mura) data 351 presented by the plurality of screen blocks 33 of the display screen 31 captured by the camera (camera), as schematically shown in fig. 3 (B), a pixel 311 comprises a red (R) sub-pixel, a green (G) sub-pixel and a blue (B) sub-pixel, and the display screen 31 correspondingly has a red (R) sub-pixel channel, a green (G) sub-pixel channel and a blue (B) sub-pixel channel; next, in step S203, for each sub-pixel channel of the display screen 31, according to the retrieved Mura data of the plurality of frame blocks 33 of the display screen 31, the luminance non-uniformity (Mura) compensation value 353 of the plurality of frame blocks 33 of the display screen 31 is calculated, and as schematically shown in fig. 3 (C), a pixel 311 includes a red (R) sub-pixel, a green (G) sub-pixel and a blue (B) sub-pixel, and the display screen 31 has a red (R) sub-pixel channel, a green (G) sub-pixel channel and a blue (B) sub-pixel channel correspondingly.
Next, in step S205, according to the Mura compensation value 353 obtained in the foregoing step S203, for each pixel channel of the display screen 31, the brightness non-uniformity (Mura) compensation value variation 355 of each screen block 33 of the display screen 31 is calculated, and as schematically shown in fig. 3 (D), the Mura compensation value variation 355 of each screen block 33 of the red (R), green (G) and blue (B) sub-pixels is determined by the following calculation formula, in which the pixel 311 includes a red (R), green (G) and blue (B) sub-pixels, and the display screen 31 has a red (R), green (G) and blue (B) sub-pixel channels, respectively.
Wherein the size of the frame block 33 is M pixels x N (M and N are positive integers greater than 1), R, G, B respectively represent red, green and blue sub-pixels, com avg Representing the average, com, of Mura compensation values in picture block 33 i Compensation value, D, representing the ith pixel in picture block 33 avg The average variance of the frame block 33 is represented, i.e., the obtained Mura compensation value variance 355 of the frame block 33.
As can be seen from the above calculation formula, for each sub-pixel channel of the display screen 31, step S205 calculates the average value of the Mura compensation values in a screen block 33, calculates the difference value between each Mura compensation value of the screen block 33 and the average value of the Mura compensation values, and averages the difference values to obtain the variation degree 355 of the Mura compensation value of the screen block 33 in the sub-pixel channel.
Then, in step S207, according to the Mura offset variation degree 355 obtained in the above step S205, for each pixel channel of the display screen 31, the above Mura offset variation degree 355 is compared with at least one variation threshold, and the compression mode 357 of each screen block 33 of the display screen 31 is selected accordingly, as shown in fig. 3 (E), and the pixel 311 includes a red (R) sub-pixel, a green (G) sub-pixel and a blue (B) sub-pixel, and the display screen 31 has a red (R) sub-pixel channel, a green (G) sub-pixel channel and a blue (B) sub-pixel channel, and at least one variation threshold includes three variation thresholds (TH 1, TH2, TH 3), where TH1> TH2> TH 3) are respectively determined by the following determination methods for the compression mode 357 of each screen block 33 of the red (R) sub-pixel channel, the green (G) sub-pixel channel and the blue (B) sub-pixel channel, respectively:
if(R_D avg >R_TH1)
R_compression_mode＝1；
else if(R_D avg >R_TH2)
R_compression_mode＝2；
else if(R_D avg >R_TH3)
R_compression_mode＝3；
else
R_compression_mode＝4；
if(G_D avg >G_TH1)
G_compression_mode＝1；
else if(G_D avg >G_TH2)
G_compression_mode＝2；
else if(G_D avg >G_TH3)
G_compression_mode＝3；
else
G_compression_mode＝4；
if(B_D avg >B_TH1)
B_compression_mode＝1；
else if(B_D avg >B_TH2)
B_compression_mode＝2；
else if(B_D avg >B_TH3)
B_compression_mode＝3；
else
B_compression_mode＝4；
wherein R, G, B represents red, green, and blue sub-pixels, TH1, TH2, and TH3 are variation threshold values, "Compression mode=1" represents Compression ratio (Compression ratio) =4/3 (1.33X), bpp (bits per pixel) =6 (bits), "Compression mode=2" represents Compression ratio (Compression ratio) =8/3 (2.66X), bpp (bits per pixel) =3 (bits), "Compression mode=3" represents Compression ratio (Compression ratio) =16/3 (5.33X), bpp (bits per pixel) =1.5 (bits), and "Compression mode=4" represents Compression ratio (Compression ratio) =32/3 (10.66X), bpp (bits per pixel) =0.75 (bits).
As can be seen from the above-mentioned judgment formula, for each pixel channel of the display screen 31, the magnitude of the compression ratio of the compression mode 357 selected by the step S207 for a frame block 33 of the display screen 31 is inversely proportional to the Mura compensation value variation degree 355 of the frame block 33, that is, when the Mura compensation value variation degree 355 of a frame block 33 is larger, the variation of the Mura compensation value is larger, the Mura compensation value is not compressed with a high compression ratio to avoid data distortion and cannot be correctly reduced, so that the compression mode 357 with a smaller compression ratio is selected, whereas when the Mura compensation value variation degree 355 of a frame block 33 is smaller, the variation of the difference between the Mura compensation values is small, and the Mura compensation value is compressed with a high compression ratio to greatly reduce the data amount, so that the compression mode 357 with a larger compression ratio is selected.
Finally, in step S209, according to the compression mode 357 obtained in step S207, the Mura compensation value 353 of each frame block 33 of the display frame 31 is compressed in the corresponding compression mode 357 for each sub-pixel channel of the display frame 31 to obtain the compressed luminance non-uniformity (Mura) compensation value 359 of each frame block 33, as shown schematically in fig. 3 (F), so as to obtain the compressed Mura compensation value of the display frame 31 for each sub-pixel channel, and the compressed Mura compensation values of the display frames 31 for all sub-pixel channels are stored in a storage device 37, such as a flash memory (flash memory), for being read into the static random access memory 391 by the display driving integrated circuit 39 for subsequent decompression to compensate the luminance non-uniformity of the display panel.
As can be seen from the above description, the conditions of uneven brightness of the red, green and blue sub-pixel channels of each pixel on the display panel are different, so that the present invention selects different compression modes for each frame block in the red, green and blue sub-pixel channels, and performs compression with corresponding magnification. And further in order to make the sum of the magnitudes of the compressed luminance non-uniformity compensation values of all the frame blocks of the display frame smaller than a preset memory capacity value, so as to ensure that the compressed data volume can be stored in the storage device 37 (or the static random access memory 391), that is, rcom_size+gcom_size+bcom_size < = dem Ram Size, where rcom_size is the magnitude of all the compressed Mura compensation values of the red sub-pixel channels in the whole display frame, gcom_size is the magnitude of all the compressed Mura compensation values of the green sub-pixel channels in the whole display frame, bcom_size is the magnitude of all the compressed Mura compensation values of the blue sub-pixel channels in the whole display frame, and the invention can ensure the best-gradation uniformity of all the red sub-pixel channels by properly adjusting the magnitudes of the variance values (TH 1, TH2, TH 3) so as to satisfy the red sub-pixel critical values, blue sub-pixel values, and thereby ensuring that the green sub-gradation uniformity is the best, and the red sub-gradation uniformity is the best.
The above embodiments are merely illustrative, and the scope of the invention is defined by the claims and not limited to the above embodiments.
Claims (12)
1. A data compression method for locally compensating for uneven brightness of a display frame, the display frame being divided into a plurality of frame blocks, the method comprising the steps of:
(A) Capturing uneven brightness data of a plurality of picture blocks of the display picture;
(B) Calculating the brightness non-uniformity compensation value of a plurality of picture blocks of the display picture according to the captured brightness non-uniformity data;
(C) Calculating the variation degree of the brightness non-uniformity compensation value of each picture block of the display picture according to the brightness non-uniformity compensation values of a plurality of picture blocks of the display picture;
(D) Selecting a data compression mode of each picture block of the display picture according to the variation degree of the brightness non-uniformity compensation value of each picture block of the display picture; and
(E) Compressing the brightness non-uniformity compensation value of each frame block of the display frame in a corresponding data compression mode to obtain a compressed brightness non-uniformity compensation value of each frame block of the display frame,
in the step (C), an average value of the luminance non-uniformity compensation values in a frame block is calculated, and then a difference value between each luminance non-uniformity compensation value of the frame block and the average value of the luminance non-uniformity compensation values is calculated, and the difference values are averaged to serve as a luminance non-uniformity compensation value variation degree of the frame block.
2. The method of claim 1, wherein the display comprises a plurality of pixels, each pixel having at least one sub-pixel, and the display has at least one sub-pixel channel.
3. The method of claim 2, wherein step (a) is to extract the non-uniform brightness data of a plurality of frame blocks of the display frame for each pixel channel of the display frame.
4. The method of claim 2, wherein step (B) calculates the luminance non-uniformity compensation values of a plurality of frame blocks of the display frame for each pixel channel of the display frame.
5. The method of claim 2, wherein step (C) calculates the variation of the brightness non-uniformity compensation value for each frame block of the display frame for each pixel channel of the display frame.
6. The method of claim 2, wherein step (D) is to select a data compression mode for each frame block of the display frame for each pixel channel of the display frame.
7. The method of claim 2, wherein step (E) compresses the luminance non-uniformity compensation value of each frame block of the display frame in a corresponding data compression mode for each pixel channel of the display frame to obtain a compressed luminance non-uniformity compensation value of each frame block of the display frame.
8. The method of claim 1, wherein in the step (D), for a frame block of the display frame, the compression ratio of the selected compression mode is inversely proportional to the variation of the brightness non-uniformity compensation value of the frame block.
9. The method of claim 1, wherein in step (D), the magnitude of the variation of the brightness non-uniformity compensation value of each frame block of the display frame is compared with at least one variation threshold to select the data compression mode of each frame block of the display frame.
10. The method of claim 9, wherein in the step (E), the sum of the magnitudes of the compressed luminance non-uniformity compensation values of all the frame blocks of the display frame is smaller than a predetermined memory capacity value.
11. The method of claim 10, wherein each pixel comprises a red sub-pixel, a green sub-pixel and a blue sub-pixel, the display has a red sub-pixel channel, a green sub-pixel channel and a blue sub-pixel channel, the at least one variation threshold is adjusted such that gcom_size > rcom_size > bcom_size, wherein rcom_size is the size of the compressed luminance non-uniformity compensation value of the red sub-pixel channel, gcom_size is the size of the compressed luminance non-uniformity compensation value of the green sub-pixel channel, and bcom_size is the size of the compressed luminance non-uniformity compensation value of the blue sub-pixel channel.
12. A storage device storing the compressed luminance non-uniformity compensation value generated by the data compression method for locally compensating luminance non-uniformity of a display screen according to claim 1.
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| CN115691370A (en) * | 2021-07-23 | 2023-02-03 | Oppo广东移动通信有限公司 | Display control method and related device |
| CN114120915A (en) * | 2021-11-11 | 2022-03-01 | 合肥维信诺科技有限公司 | Data compression method and device and data decompression method and device |
| CN114613329B (en) * | 2022-03-29 | 2024-03-26 | 合肥维信诺科技有限公司 | Data processing method and device, and brightness compensation method and device |
| CN114822397B (en) * | 2022-05-17 | 2023-11-17 | 昆山国显光电有限公司 | Data processing method and device, display panel compensation method and device |
| CN117995112B (en) * | 2024-04-01 | 2024-05-31 | 瑞旦微电子技术(上海)有限公司 | Demura data processing method and display device based on self-adaptive rectangular partitioning |
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