OLED (Organic Light Emitting Diode) screen pixel life degradation compensation method, OLED screen pixel life degradation compensation system and computer equipment

Abstract

The invention discloses an OLED (Organic Light Emitting Diode) screen pixel life degradation compensation method and system and computer equipment. The OLED screen pixel life degradation compensation method comprises the following steps: moving at least part of pixels of a display picture at set intervals according to a preset track; analyzing the display picture information of each moved sub-pixel, counting the life attenuation caused by the current display picture of each sub-pixel, and accumulating and updating the historical life attenuation of the sub-pixel at the current position; judging whether the updated historical life attenuation exceeds a preset value or not; if yes, the service life attenuation compensation amount of the sub-pixel at each current position is obtained based on the updated historical service life attenuation amount, and each current sub-pixel is compensated. According to the invention, the problems of non-uniform panel brightness caused by local compensation and early-stage over-compensation and later-stage under-compensation caused by the fact that different aging speeds are not considered can be solved.

Description

Technical Field

[0001] The present invention relates to the field of display panels, and in particular to an OLED screen pixel life degradation compensation method, system and computer equipment. Background Art

[0002] Despite the continuous advancement of organic materials and manufacturing technology, lifetime degradation remains a technical barrier in the application of OLED displays. The luminous efficiency of OLED decreases with the extension of usage time. This uneven degradation is what we often call screen burn-in. The occurrence of screen burn-in is related to the cumulative current density that is unevenly delivered to each pixel in the display panel. Especially in the application of fingerprint (FPS) and under-screen camera (UDC), the burn-in phenomenon caused by screen burn-in will be more serious because more current consumption is required to drive high-brightness pixels.

[0003] In the prior art, the compensation target of the lifetime degradation compensation scheme is usually set to the sub-pixel information with the most or least severe aging. However, due to the different aging attenuation curves of RGB materials, B usually ages the fastest. After a certain period of time, the color of the sub-pixel with the most or least severe aging will be biased. Therefore, it is unreasonable to only use the sub-pixel information with the most or least severe aging as the compensation target. In addition, the aging speed of OLED pixels is different in different time periods. The aging curve obtained by fitting cannot accurately reflect the degradation of the pixels. The aging speed is different in different use stages. This method of storing the attenuation curve will lead to large compensation deviations in the later stage of product use, and it is impossible to rework and correct errors, which affects the user experience. Summary of the invention

[0004] In view of this, the purpose of the present invention is to provide a method for compensating for the lifetime degradation of OLED screen pixels, so as to solve the problem of uneven panel brightness caused by local compensation and over-compensation in the early stage and under-compensation in the later stage due to failure to consider different aging speeds.

[0005] According to one aspect of the present invention, there is provided a method for compensating for pixel lifetime degradation of an OLED screen, comprising:

[0006] At least part of the pixels of the display screen are moved along a preset trajectory at regular intervals;

[0007] Analyze the display image information of each sub-pixel after the move, count the life attenuation caused by the current display image of each sub-pixel, and accumulate and update the historical life attenuation of the sub-pixel at the current position;

[0008] Determine whether the updated historical life attenuation exceeds the preset value;

[0009] If so, based on the updated historical lifetime attenuation, the lifetime attenuation compensation amount of each sub-pixel at the current position is obtained, and each current sub-pixel is compensated.

[0010] Optionally, the preset trajectory includes a Z-shape or a U-shape.

[0011] Optionally, the statistical life attenuation caused by the current display image of each sub-pixel is specifically:

[0012] Based on the gamma information at the current display brightness level, the grayscale value of each sub-pixel at the current position is converted into the driving voltage and current of each sub-pixel by calculation;

[0013] According to the lookup table of the corresponding relationship between voltage, current and life attenuation obtained based on the OLED material aging experiment, the life attenuation caused by the current display picture of each sub-pixel is obtained.

[0014] Optionally, the preset value is an empirically determined value.

[0015] Optionally, the method further includes performing multiple lifetime degradation compensations on the OLED screen, and the time interval between two adjacent lifetime degradation compensations gradually becomes shorter.

[0016] Optionally, the lifetime attenuation compensation amount of the sub-pixel at each current position is obtained by looking up a lookup table of lifetime attenuation amounts and compensation amounts.

[0017] According to another aspect of the present invention, there is also provided an OLED screen pixel lifetime degradation compensation system, comprising:

[0018] A pixel transfer module is used to move the display image along a preset trajectory at regular intervals;

[0019] A display statistics module is used to analyze the display image information of each sub-pixel after the movement, count the life attenuation brought by the current display image of each sub-pixel, and accumulate and update the historical life attenuation of the sub-pixel at the current position;

[0020] A judgment module, used to judge whether the updated historical life attenuation exceeds a preset value;

[0021] The life compensation module is used to obtain the life attenuation compensation amount of each sub-pixel at the current position based on the updated historical life attenuation amount when the updated historical life attenuation amount exceeds the preset value, and compensate each current sub-pixel.

[0022] According to another aspect of the present invention, a computer device is also provided, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the method for compensating for the life span degradation of pixels of an OLED screen as described in any embodiment of the present invention is implemented.

[0023] According to another aspect of the present invention, a computer-readable storage medium is further provided, wherein the computer-readable storage medium stores a computer program, and the computer program implements the OLED screen pixel life degradation compensation method described in any embodiment of the present invention.

[0024] According to another aspect of the present invention, a computer program product is also provided, comprising at least one instruction or at least one program segment, wherein the at least one instruction or the at least one program segment is loaded and executed by a processor to implement the OLED screen pixel life degradation compensation method described in any embodiment of the present invention.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention implements block pixel movement at each display to reduce the risk of fixed block imprinting, and at the same time promptly records the attenuation of each sub-pixel during the display process. When the attenuation reaches a certain level, the aging compensation module is activated for compensation. On the other hand, by setting unequal compensation time intervals based on the aging attenuation rate, the defects of conventional compensation schemes, i.e., under-compensation for early aging and under-compensation for late aging, can be avoided. Finally, the aging compensation table of this proposal has a certain degree of flexibility, and the product can be reworked for secondary calibration after a few years of use. This can be done by simply modifying the information in the two compensation tables, thereby increasing the service life of the OLED display. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 Overall flow chart for life degradation compensation;

[0029] Figure 2 Schematic diagram of pixel transfer;

[0030] Figure 3 To display the statistical flow chart;

[0031] Figure 4 This is the aging compensation flow chart. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] The embodiment of the present invention provides a method for compensating for the lifetime degradation of an OLED screen pixel. Figure 1 As shown, the following steps are included:

[0034] S1, moving at least part of the pixels of the display screen along a preset trajectory at regular intervals;

[0035] like Figure 2 As shown, the left side is the input image to be displayed, and the right side is the preset direction and amount of pixel movement. Optionally, the total number of preset pixel displacements is 5*5=25, the x direction can move ±2, the y direction can move ±2, and then set the moving track during the display process, and move the input display screen by one position every certain period of time.

[0036] Further optionally, the preset pixel movable direction is a zigzag or a U-shaped direction, which can be adjusted according to the display situation in actual application.

[0037] S2, analyzing the display picture information of each sub-pixel after the movement, counting the life attenuation caused by the current display picture of each sub-pixel, and accumulating and updating the historical life attenuation of the sub-pixel at the current position;

[0038] like Figure 3As shown, the grayscale value of the image at the current coordinate position is found according to the current coordinate position, because the brightness value (voltage / current value) corresponding to the same grayscale value under different DBV (brightness level) is different, and the display screen will switch different DBVs according to the usage scenario and ambient light in actual application. In order to calculate accurately, it is necessary to convert the relative grayscale value into the driving voltage and current of the sub-pixel at the current position based on the gamma information under the current display DBV. Then, the lookup table of the corresponding relationship between voltage / current and life attenuation is searched (R / G / B sub-pixels are separated), and the life attenuation of the sub-pixel at the current position is obtained based on the table lookup result or non-node table lookup and interpolation. The life attenuation of each previous use is accumulated and recorded, and the historical life attenuation of the sub-pixel at the current position is obtained, and then the life attenuation brought by the new use process is added to obtain the updated historical life attenuation. Aging is an irreversible process that will gradually degrade with the increase of usage time. By monitoring and recording the usage of the product at all times, the aging of the sub-pixel at each pixel position can be accurately grasped.

[0039] Optionally, a lookup table of the corresponding relationship between voltage / current and life attenuation is obtained based on an aging experiment of OLED materials. A long-term burn-in experiment is performed at different voltages / currents, and the relationship between voltage / current and life attenuation is statistically analyzed to obtain the lookup table.

[0040] S3, judging whether the updated historical life attenuation exceeds a preset value;

[0041] Optionally, the preset value is an empirically determined value.

[0042] S4. If yes, then based on the updated historical lifetime attenuation, the lifetime attenuation compensation amount of each sub-pixel at the current position is obtained, and each sub-pixel at the current position is compensated.

[0043] like Figure 4 As shown, it is determined whether the accumulated lifetime attenuation of the sub-pixel at the current position reaches a preset value. If it reaches the preset value, the lifetime attenuation compensation amount of the sub-pixel at the current position is obtained based on a lookup table of lifetime attenuation and compensation amount (separate for R / G / B sub-pixels), and then based on the gamma information under the current display DBV, the compensation amount is converted into a grayscale value to be compensated for the sub-pixel at the current position, and added to the input grayscale value of the picture at the current coordinate position to obtain the compensated output grayscale value of the sub-pixel at the current coordinate position, and sent to the picture display module for output; if it is determined that the accumulated lifetime attenuation of the sub-pixel at the current position does not reach the preset value, the input grayscale value of the picture at the current coordinate position is sent to the picture display module for output.

[0044] Optionally, a lookup table of lifetime attenuation and compensation amount can be obtained by calculation. After the pixel attenuation is known, the compensation amount can be calculated and filled into the lookup table in combination with the target brightness to be compensated.

[0045] Optionally, the OLED screen needs to be compensated multiple times during its entire life cycle. Since the aging rate is relatively slow in the early stage of product use, no compensation is required in the early stage of use to prevent over-compensation. As the OLED material is used, the aging rate accelerates. In order to solve the problem of under-compensation in the later stage of life, the time interval between each compensation is gradually shortened.

[0046] The embodiment of the present invention further provides an OLED screen pixel life degradation compensation system, comprising:

[0047] A pixel transfer module is used to move the display image along a preset trajectory at regular intervals;

[0048] A display statistics module is used to analyze the display image information of each sub-pixel after the movement, count the life attenuation brought by the current display image of each sub-pixel, and accumulate and update the historical life attenuation of the sub-pixel at the current position;

[0049] A judgment module, used to judge whether the updated historical life attenuation exceeds a preset value;

[0050] The life compensation module is used to obtain the life attenuation compensation amount of each sub-pixel at the current position based on the updated historical life attenuation amount when the updated historical life attenuation amount exceeds the preset value, and compensate each current sub-pixel.

[0051] An embodiment of the present invention also provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the OLED screen pixel life degradation compensation method described in any embodiment of the present invention is implemented.

[0052] An embodiment of the present invention further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and the computer program implements the OLED screen pixel life degradation compensation method described in any embodiment of the present invention.

[0053] The present exemplary embodiment also provides a computer program product, including at least one instruction or at least one program, which is loaded and executed by a processor to implement the OLED screen pixel life degradation compensation method described in any embodiment of the present invention.

[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for compensating for pixel lifetime degradation of an OLED screen, characterized in that: include: At least part of the pixels of the display screen are moved along a preset trajectory at regular intervals; Analyze the display image information of each sub-pixel after the move, count the life attenuation caused by the current display image of each sub-pixel, and accumulate and update the historical life attenuation of the sub-pixel at the current position; Determine whether the updated historical life attenuation exceeds the preset value; If so, based on the updated historical lifetime attenuation, the lifetime attenuation compensation amount of each sub-pixel at the current position is obtained, and each current sub-pixel is compensated.

2. The method according to claim 1, characterized in that The preset trajectory includes a zigzag shape or a U-shaped shape.

3. The method according to claim 1, characterized in that The life attenuation caused by the current display image of each sub-pixel is specifically calculated as follows: Based on the gamma information at the current display brightness level, the grayscale value of each sub-pixel at the current position is converted into the driving voltage and current of each sub-pixel by calculation; According to the lookup table of the corresponding relationship between voltage, current and life attenuation obtained based on the OLED material aging experiment, the life attenuation caused by the current display picture of each sub-pixel is obtained.

4. The method according to claim 1, characterized in that: The preset value is an empirically determined value.

5. The method according to claim 1, characterized in that: It also includes multiple life degradation compensations for the OLED screen, and the time interval between two adjacent life degradation compensations gradually becomes shorter.

6. The method according to claim 1, characterized in that The lifetime attenuation compensation amount of the sub-pixel at each current position is obtained by looking up a lookup table of lifetime attenuation amounts and compensation amounts.

7. An OLED screen pixel lifetime degradation compensation system, characterized in that: include: A pixel transfer module is used to move the display image along a preset trajectory at regular intervals; A display statistics module is used to analyze the display image information of each sub-pixel after the movement, count the life attenuation brought by the current display image of each sub-pixel, and accumulate and update the historical life attenuation of the sub-pixel at the current position; A judgment module, used to judge whether the updated historical life attenuation exceeds a preset value; The life compensation module is used to obtain the life attenuation compensation amount of each sub-pixel at the current position based on the updated historical life attenuation amount when the updated historical life attenuation amount exceeds the preset value, and compensate each current sub-pixel.

8. A computer device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the method according to any one of claims 1 to 6 is implemented.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method according to any one of claims 1 to 6 is implemented.

10. A computer program product, characterized in that The method comprises at least one instruction or at least one program, wherein the at least one instruction or the at least one program is loaded and executed by a processor to implement the method according to any one of claims 1 to 6.

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