CN112927640A - Data compression method and storage device for locally compensating uneven brightness of display picture - Google Patents
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Abstract
A data compression method capable of locally compensating uneven brightness of a display frame, the display frame is divided into a plurality of frame blocks, the method comprises: capturing uneven brightness (Mura) data of a plurality of frame blocks of a display frame; calculating a compensation value of uneven brightness (Mura) of a plurality of frame blocks of the display frame according to the captured Mura data; calculating the variation degree of the uneven brightness (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 for each frame block of the display frame according to the degree of Mura compensation value variation of each frame block of the display frame; and compressing the Mura compensation value of each picture block of the display picture by a corresponding compression mode to obtain a compressed uneven brightness (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 non-uniform brightness of a display screen and a storage device for storing a compressed Mura compensation value generated by the method.
Background
For a common thin film Display panel (for example, LCD, OLED, etc.), the process problem often causes the phenomenon of uneven brightness (Mura) when the panel displays, which causes the panel to have stripe-shaped traces, block-shaped traces, sand-shaped traces, or any combination of the above stripe-shaped traces, block-shaped traces, and sand-shaped traces, therefore, in order to improve the quality yield of the Display screen of the panel, it is necessary to add the function of removing the uneven brightness (Demura) or compensating the uneven brightness into the Display driving integrated circuit (Display driving IC).
Fig. 1 shows a general technical architecture for compensating brightness unevenness (Demura), which includes the following processes: (A) capturing brightness unevenness (Mura) data 12 of the whole display screen of a display panel 11 by a camera (camera); (B) calculating a compensation value 13 of uneven brightness (Mura) of the display frame according to the captured uneven brightness data 12 of the display frame; (C) performing data compression coding on the Mura compensation value 13 of the display picture to obtain a compressed uneven brightness (Mura) compensation value 14 of the display picture; (D) storing the compressed Mura compensation value 14 of the display picture in a storage device 15 such as a Flash memory (Flash memory); and (E) the display driver ic 16 loads the compressed Mura compensation value 14 of the display frame from the storage device 15 to a Static Random Access Memory (SRAM) 161, decompresses the compressed Mura compensation value to restore a Mura compensation value 13 'of the display frame, and performs brightness compensation (Demura) on the display frame of the display panel 11 according to the Mura compensation value 13' of the display frame.
Therefore, the most core technology of the existing Demura technology architecture is data compression processing and calculation of the Mura compensation value, if a low data compression ratio is adopted, a large enough memory (flash memory and static random access memory) is required to store the uniformity compensation data of the display picture (compressed Mura compensation value of the display picture), otherwise, if a high data compression ratio is adopted, the capacity of the memory (flash memory and static random access memory) can be reduced, but if the data compression is too much, the uniformity compensation effect is not good, so how to balance (Trade-off) between the memory capacity and the uniformity compensation effect is a problem to be solved.
However, in the conventional Demura technique, the data compression processing of the Mura compensation values is performed by using the same data compression ratio for the Mura compensation values of the entire display screen, so that the required memory capacity must be increased as the panel resolution is increased to greatly increase the amount of the Mura data and the Mura compensation values, which increases the cost of the application system and the display driver ic, and further makes it difficult to balance the memory capacity and the uniformity compensation effect.
Therefore, the conventional data compression method for compensating the brightness non-uniformity still has many defects, and it is difficult to satisfy the requirements of the present high resolution display device, and there is still a need for improvement.
Disclosure of Invention
The present invention is directed to a data compression method capable of locally compensating for the non-uniformity of the brightness of a display screen, which performs data compression by using different compression ratios according to the Mura regions and types of different display screens, and simultaneously considers the effects of required memory capacity reduction and uniformity compensation, so as to effectively solve the above-mentioned deficiencies in the prior art.
According to one aspect of the present invention, a data compression method for locally compensating luminance non-uniformity of a display frame is provided, the display frame is divided into a plurality of frame blocks, the method comprises the steps of: (A) capturing uneven brightness (Mura) data of a plurality of frame blocks of the display frame; (B) calculating a compensation value of uneven brightness (Mura) of a plurality of frame blocks of the display frame according to the captured Mura data; (C) calculating the variation degree of the uneven brightness (Mura) compensation value of each picture block of the display picture according to the Mura compensation values of the plurality of picture blocks of the display picture; (D) selecting a data compression mode for each frame block of the display frame according to the degree of Mura compensation value variation of each frame block of the display frame; and (E) compressing the Mura compensation value of each frame block of the display frame by the corresponding data compression mode to obtain a compressed uneven brightness (Mura) compensation value of each frame block of the display frame.
According to another aspect of the present invention, a storage device is provided for storing compressed Mura compensation values generated by the local de-Mura data compression method.
The foregoing summary, as well as the following detailed description, is exemplary in nature and is intended to further illustrate the present invention as claimed, and other objects and advantages of the invention will be apparent from the following description and drawings.
Drawings
Fig. 1 schematically shows a general technical architecture for compensating for luminance unevenness (Demura).
FIG. 2 is a flowchart illustrating a data compression method for locally compensating the display luminance non-uniformity according to the present invention.
FIGS. 3(A) to 3(F) schematically show the execution state of the data compression method for locally compensating the display luminance unevenness according to the present invention.
Description of the symbols:
uneven brightness data 12 of display panel 11
Luminance unevenness compensation value of 13, 13'
Compressed luminance unevenness compensation value 14
Storage device 15 display driver IC 16
SRAM 161
Steps S201, S203, S205, S207, S209
Uneven brightness data 351 for picture block 33
Brightness unevenness compensation value 353
Degree of variation 355 of luminance unevenness compensation value
The compression mode 357 compresses the luminance unevenness compensation value 359
Static random access memory 391
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
FIG. 2 is a flow chart of the data compression method for locally compensating the display screen luminance unevenness according to the present invention, and FIGS. 3(A) to 3(F) schematically show the execution states of the data compression method for locally compensating the display screen luminance unevenness according to the present invention.
Referring to fig. 2 and fig. 3(a) to 3(F), the data compression method for locally compensating the brightness unevenness of the display screen according to the present invention is to perform data compression for removing the brightness unevenness or compensating the brightness (Demura) of 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, 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. Furthermore, each pixel 311 has at least one sub-pixel, that is, the display frame 31 has at least one sub-pixel channel, in the following description of the present embodiment, each pixel 311 includes three sub-pixels, i.e., a red (R) sub-pixel, a green (G) sub-pixel, and a blue (B) sub-pixel, so that the display frame 31 has three sub-pixel channels, i.e., a red (R) sub-pixel channel, a green (G) sub-pixel channel, and a blue (B) sub-pixel channel, which is only exemplary and not limiting.
First, in step S201, for each sub-pixel channel of the display screen 31, using the uneven brightness (Mura) data 351 represented by the frame blocks 33 of the display screen 31 captured by a camera (camera), as schematically shown in fig. 3(B), 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 S203, for each sub-pixel channel of the display frame 31, the non-uniform brightness (Mura) compensation value 353 of the plurality of frame blocks 33 of the display frame 31 is calculated according to the captured Mura data of the plurality of frame blocks 33 of the display frame 31, as shown in fig. 3(C), for example, a pixel 311 includes a red (R) sub-pixel, a green (G) sub-pixel and a blue (B) sub-pixel, and the display frame 31 has a red (R) sub-pixel channel, a green (G) sub-pixel channel and a blue (B) sub-pixel channel.
Next, in step S205, according to the Mura compensation value 353 obtained in step S203, for each sub-pixel channel of the display screen 31, the variation 355 of the luminance non-uniformity (Mura) compensation value of each frame block 33 of the display screen 31 is calculated, as schematically shown in fig. 3(D), taking an example that 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 corresponds to a red (R) sub-pixel channel, a green (G) sub-pixel channel and a blue (B) sub-pixel channel, this step is to determine the variation 355 of the Mura compensation value of each frame block 33 of the red (R) sub-pixel channel, the green (G) sub-pixel channel and the blue (B) sub-pixel channel by the following calculation formula:
wherein the size of the frame block 33 is M pixels x N pixels (M and N are positive integers greater than 1), R, G, B represents red, green and blue sub-pixels ComavgRepresents the average, Com, of the Mura compensation values in the picture block 33iRepresents the compensation value, D, of the ith pixel in the frame block 33avgRepresents the average variance of the frame block 33, i.e., the degree of variance 355 of the Mura compensation value of the frame block 33.
As can be seen from the above calculation formula, for each sub-pixel channel of the display frame 31, step S205 is to calculate an average value of the Mura compensation values in a frame block 33, calculate a difference value between each Mura compensation value of the frame block 33 and the average value of the Mura compensation values, and average the difference values to obtain the Mura compensation value variation 355 of the frame block 33 in the sub-pixel channel.
Then, in step S207, according to the Mura compensation value variation 355 obtained in step S205, for each sub-pixel channel of the display 31, the Mura compensation value variation 355 is compared with at least one variation threshold, and accordingly the compression mode 357 for each frame block 33 of the display 31 is selected, as schematically shown in FIG. 3(E), with a pixel 311 comprising a red (R) sub-pixel, a green (G) sub-pixel and a blue (B) sub-pixel, the display 31 has a red (R) sub-pixel channel, a green (G) sub-pixel channel and a blue (B) sub-pixel channel, and the at least one variance threshold includes three variance thresholds (TH1, TH2, TH3, wherein TH1> TH2> TH3), for example, the compression mode 357 for each frame 33 of the red (R), green (G) and blue (B) sub-pixel channels is determined according to the following criteria:
if(R_Davg>R_TH1)
R_compression_mode＝1；
else if(R_Davg>R_TH2)
R_compression_mode＝2；
else if(R_Davg>R_TH3)
R_compression_mode＝3；
else
R_compression_mode＝4；
if(G_Davg>G_TH1)
G_compression_mode＝1；
else if(G_Davg>G_TH2)
G_compression_mode＝2；
else if(G_Davg>G_TH3)
G_compression_mode＝3；
else
G_compression_mode＝4；
if(B_Davg>B_TH1)
B_compression_mode＝1；
else if(B_Davg>B_TH2)
B_compression_mode＝2；
else if(B_Davg>B_TH3)
B_compression_mode＝3；
else
B_compression_mode＝4；
r, G, B represents red, green and blue sub-pixels, TH1, TH2 and TH3 are variation thresholds, "Compression mode" 1 "represents a Compression ratio (Compression ratio) 4/3(1.33X), bpp (bit pixel) 6(bits)," Compression mode "2" represents a Compression ratio (Compression ratio) 8/3(2.66X), bpp (bit pixel) 3(bits), "Compression mode" 3 "represents a Compression ratio (Compression ratio) 16/3(5.33X), bpp (bit pixel) 1.5(bits)," Compression mode "4" represents a Compression ratio (Compression ratio) 32/3(10.66X), and "Compression mode" 75(bit X) 0.
From the above-mentioned determination, for each sub-pixel channel of the display screen 31, the compression ratio of the compression mode 357 selected by the step S207 for a frame 33 of the display screen 31 is inversely proportional to the Mura compensation value variation 355 of the frame 33, i.e. when the Mura compensation value variation 355 of a frame 33 is larger, the variation between the Mura compensation values is larger, it is not preferable to compress the Mura compensation values with a high compression ratio so as to avoid data distortion and incorrect restoration, so the compression mode 357 with a smaller compression ratio is selected, whereas when the Mura compensation value variation 355 of a frame 33 is smaller, the variation between the Mura compensation values is smaller, it is preferable to compress the Mura compensation values with a high compression ratio so as to greatly reduce the data amount, so 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, for each sub-pixel channel of the display 31, the Mura compensation value 353 of each frame block 33 of the display 31 is compressed by the corresponding compression mode 357 to obtain a compressed Mura compensation value 359 of each frame block 33, as schematically shown in fig. 3(F), so as to obtain a compressed Mura compensation value for the display 31 of each sub-pixel channel, and the compressed Mura compensation values for the display 31 of all sub-pixel channels are stored in a storage device 37, such as a flash memory (flash memory), for being subsequently read into a static random access memory 391 by the display driver ic 39 for decompression to compensate for the brightness unevenness of the display panel.
As can be seen from the above description, since the brightness unevenness of the red, green, and blue sub-pixel channels of each pixel on the display panel is different, the present invention selects different compression modes for each image 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 uneven brightness compensation values of all the frame blocks of the display frame smaller than a predetermined memory capacity value, so as to ensure that the compressed data amount can be stored in the storage device 37 (or sram 391), i.e., Rcom _ Size + Gcom _ Size + Bcom _ Size < ═ Demura 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 Demura Ram Size is the magnitude of the storage device 37 (or sram 391), the present invention can properly adjust the magnitudes of the variation thresholds (TH1, 2, TH3) to satisfy the red and green color and TH, The requirements of the magnitude of all the compressed Mura compensation values of the blue sub-pixel channels are met, wherein, since adjusting the magnitude of all the compressed Mura compensation values of the red, green and blue sub-pixel channels affects the respective Demura effects of the red, green and blue sub-pixel channels and the Demura effects of the gray scales, and the uniformity of the green scales affects the uniformity of the gray scales to the maximum, in the actual operation of Demura, the gray scale uniformity is the most preferred, and Gcom _ size > Rcom _ size > Bcom _ size is given to ensure the good gray scale Demura effect.
The above-described embodiments are merely exemplary for convenience in explanation, and the scope of the claims of the present invention should be determined by the claims rather than by the limitations of the above-described embodiments.
Claims (13)
1. A data compression method for locally compensating uneven brightness of a display frame, the display frame is divided into a plurality of frame blocks, the method comprises the following steps:
(A) capturing uneven brightness data of a plurality of picture blocks of the display picture;
(B) calculating the brightness unevenness compensation value of a plurality of picture blocks of the display picture according to the captured brightness unevenness data;
(C) calculating the variation degree of the brightness unevenness compensation value of each picture block of the display picture according to the brightness unevenness compensation values of a plurality of picture blocks of the display picture;
(D) selecting a data compression mode for each frame block of the display frame according to the variation degree of the brightness unevenness compensation value of each frame block of the display frame; and
(E) compressing the brightness unevenness compensation value of each picture block of the display picture by a corresponding data compression mode to obtain a compressed brightness unevenness compensation value of each picture block of the display picture.
2. The data compression method as claimed in claim 1, wherein the display comprises a plurality of pixels, each pixel having at least one sub-pixel, the display having at least one sub-pixel channel.
3. The method as claimed in claim 2, wherein the step (A) is performed by capturing the luminance non-uniformity data of a plurality of blocks of the display frame for each sub-pixel channel of the display frame.
4. The data compression method as claimed in claim 2, wherein the step (B) calculates the luminance unevenness compensation values for a plurality of frame blocks of the display frame for each sub-pixel channel of the display frame.
5. The data compression method as claimed in claim 2, wherein the step (C) calculates the variation of the luminance nonuniformity compensation value for each frame block of the display frame for each sub-pixel channel of the display frame.
6. The method as claimed in claim 2, wherein the step (D) selects the data compression mode for each frame block of the display frame for each sub-pixel channel of the display frame.
7. The data compression method as claimed in claim 2, wherein the step (E) compresses the luminance nonuniformity compensation value of each frame block of the display frame in the corresponding data compression mode for each sub-pixel channel of the display frame to obtain the compressed luminance nonuniformity compensation value of each frame block of the display frame.
8. The data compression method as claimed in claim 1, wherein in the step (C), an average value of the luminance unevenness compensation values in a frame block is calculated, and then a difference value between each luminance unevenness compensation value of the frame block and the average value of the luminance unevenness compensation values is calculated, and the difference values are averaged to obtain the variation degree of the luminance unevenness compensation values of the frame block.
9. The data compression method as claimed in claim 1, wherein in step (D), for a frame block of the display screen, the compression ratio of the compression mode is selected to have a magnitude inversely proportional to the variation degree of the brightness unevenness compensation value of the frame block.
10. The data compression method as claimed in claim 1, wherein in the step (D), the data compression mode of each frame block of the display screen is selected by comparing the variation degree of the brightness unevenness compensation value of each frame block of the display screen with at least one variation threshold.
11. The data compression method according to claim 10, wherein in the step (E), the sum of the compressed uneven brightness compensation values of all the frame blocks of the display is smaller than a predetermined memory capacity value.
12. The method as claimed in claim 11, 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 variance threshold is adjusted such that Gcom _ size > Rcom _ size > Bcom _ size, where Rcom _ size is the size of all the compressed luminance non-uniformity compensation values of the red sub-pixel channel in the display, Gcom _ size is the size of all the compressed luminance non-uniformity compensation values of the green sub-pixel channel in the display, and Bcom _ size is the size of all the compressed luminance non-uniformity compensation values of the blue sub-pixel channel in the display.
13. A storage device, characterized by storing the compressed brightness unevenness compensation value generated by the data compression method for locally compensating the brightness unevenness of the display screen as claimed in claim 1.
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| 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 |
| CN114613329A (en) * | 2022-03-29 | 2022-06-10 | 合肥维信诺科技有限公司 | Data processing method and device, and brightness compensation method and device |
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| CN117995112A (en) * | 2024-04-01 | 2024-05-07 | 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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