Gamma correction method and device of display panel and storage medium

Abstract

The application provides a Gamma correction method, device and storage medium of a display panel, wherein the Gamma correction method of the display panel comprises the following steps: adjusting the display panel to obtain a first adjusted display panel, the first adjusted display panel has a normal target Gamma value; performing optical compensation on the adjusted display panel; and adjusting the optical compensated display panel to obtain a second adjusted display panel, the second adjusted display panel has an actual Gamma value, the actual Gamma value is different from the normal target Gamma value. In the application, the correction process of the Gamma value of the display panel is divided into two steps, and the optical compensation process of the display panel is inserted in the first step correction process and the second step correction process, so that the correction of the Gamma value of the display panel is realized on the basis of not affecting the optical compensation of the display panel.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a method, apparatus, and storage medium for Gamma correction of a display panel. Background Technology

[0002] In the manufacturing process of display panels, standard fixture backlighting is used for gamma adjustment. However, with the increasing adoption of various backlight types, such as Mini LED backlighting in complete LCD displays, differences arise between the fixture backlighting and the overall backlighting used in production, leading to gamma discrepancies. Therefore, gamma correction is necessary during production to ensure the overall LCD display's gamma remains within specifications. Figure 1 As shown, the GammaGap of the same LCD panel under different backlights is the difference that needs to be corrected during the production process. In order to ensure that the client's Gamma is 2.2, the Gamma needs to be adjusted to 2.6 during production.

[0003] Current technology corrects gamma during gamma adjustment. However, for VA LCDs, changes in gamma value lead to lower brightness, which causes significant viewing angle differences. For example, adjusting gamma from 2.2 to 2.6 may reduce the brightness of the same grayscale from 3 nits to 1.5 nits. This significant reduction in grayscale brightness can cause inaccurate extraction of mura data from the displayed image during the gamma-corrected demura process, leading to new optical compensation anomalies. Summary of the Invention

[0004] This invention provides a method, apparatus, and storage medium for Gamma correction of a display panel, in order to improve the technical problem that the mura repair effect of the subsequent Demura process of the display panel is poor after Gamma correction.

[0005] This invention provides a method for Gamma correction of a display panel, comprising:

[0006] Step S1: Adjust the display panel to obtain the display panel after the first adjustment, and the display panel after the first adjustment has a normal target Gamma value;

[0007] Step S2: Perform optical compensation on the adjusted display panel; and

[0008] Step S3: Adjust the display panel after optical compensation to obtain the display panel after a second adjustment. The display panel after the second adjustment has an actual Gamma value, which is different from the normal target Gamma value.

[0009] Step S2 is located between step S1 and step S3.

[0010] In some embodiments of the present invention, step S3 includes:

[0011] Based on the backlight measurement curve of the terminal using the display panel and the backlight measurement curve of the display panel, the optically compensated display panel is adjusted to obtain the second adjusted display panel.

[0012] In some embodiments of the present invention, the actual Gamma value is greater than the normal target Gamma value.

[0013] In some embodiments of the present invention, the normal target Gamma value ranges from 2.0 to 2.4.

[0014] In some embodiments of the present invention, adjusting the optically compensated display panel to obtain the second adjusted display panel includes:

[0015] Get the current brightness of multiple bound point grayscale levels;

[0016] Based on the difference between the current brightness and the target brightness, generate brightness compensation values ​​for multiple grayscale levels of the binding points;

[0017] Based on the brightness compensation values ​​of the multiple binding point gray levels, brightness compensation values ​​of gray levels between adjacent binding point gray levels are generated, wherein the brightness compensation values ​​of the multiple binding point gray levels and the gray levels between adjacent binding point gray levels are used to be written to the storage module of the display panel.

[0018] In some embodiments of the present invention, the generation of brightness compensation values ​​between adjacent gray levels of binding points based on the brightness compensation values ​​of the plurality of binding point gray levels is obtained by linear interpolation.

[0019] In some embodiments of the present invention, step S2 includes:

[0020] Light up the display panel and acquire multiple display images from the display panel;

[0021] Mura recognition is performed on the multiple display screens to obtain mura data;

[0022] Based on the mura data and the Demura compensation algorithm, obtain the corresponding Demura data;

[0023] The Demura data is burned into the storage module of the display panel.

[0024] The present invention also provides a gamma correction device for a display panel, comprising:

[0025] The first adjustment module is used to adjust the display panel to obtain the display panel after the first adjustment, wherein the display panel after the first adjustment has a normal target Gamma value;

[0026] An optical compensation module is used to perform optical compensation on the adjusted display panel;

[0027] The second adjustment module is used to adjust the optically compensated display panel to obtain the second adjusted display panel, wherein the second adjusted display panel has an actual Gamma value, which is different from the normal target Gamma value.

[0028] In some embodiments of the present invention, the storage module is further included, and the first adjustment module, the optical compensation module, and the second adjustment module are all electrically connected to the storage module.

[0029] In addition, the present invention provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0030] In the Gamma correction method for display panels provided in this embodiment of the invention, the correction process of the Gamma value of the display panel is divided into two steps. During the first and second correction steps, an optical compensation process for the display panel is interspersed. Since the normal target Gamma value obtained after the first correction does not further affect the brightness of the grayscale of the display panel, the Gamma value of the display panel is corrected without affecting the optical compensation step of the display panel. This allows the corrected display panel to meet the display requirements of the terminal after being applied to the terminal. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1These are the Gamma curves under different backlighting conditions mentioned in the background section of this invention;

[0033] Figure 2 This is a schematic diagram of the Gamma correction process in the prior art provided by the present invention;

[0034] Figure 3 This is a flowchart of the Gamma correction method for a display panel provided in an embodiment of the present invention;

[0035] Figure 4 This is a schematic diagram of the Gamma correction process for a display panel provided in an embodiment of the present invention;

[0036] Figure 5 This is a flowchart of the Demura repair process for a display panel provided in an embodiment of the present invention;

[0037] Figure 6 This is a structural block diagram of the Gamma correction device for a display panel provided in an embodiment of the present invention. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present invention and are not intended to limit the present invention. In the present invention, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0039] In existing technologies, such as Figure 2As shown, Gamma correction is generally performed using a Gamma adjustment device. For example, by adjusting the Gamma voltage using a Gamma adjustment device, the existing Gamma value of 2.2 can be corrected to a corrected Gamma value of 2.4. The gap is obtained by comparing the measurement curves of the production backlight and the customer-end backlight. The customer-end backlight can be a MiniLED backlight or other types of backlight. Since the Gamma value of the display panel is adjusted from 2.2 to 2.4 after Gamma correction, the brightness of the grayscale of the display panel will decrease. When the display panel performs optical compensation under low brightness conditions, it is necessary to use a camera to take pictures of the display screen. By acquiring multiple images of the display screen, optical defects in the display screen can be identified. However, taking pictures of the display screen under low brightness conditions will inevitably result in unclear images. The unclear images will affect the identification and repair of defects in the display screen.

[0040] Therefore, during the process of Gamma correction of the display panel, it is also necessary to consider the adverse effects on the optical compensation of the subsequent display panel, so as to avoid causing new display problems to the display panel.

[0041] To address the problems existing in the prior art, this embodiment provides a method for Gamma correction of a display panel, such as... Figure 3 As shown, the correction method includes:

[0042] Step S1: Adjust the display panel to obtain the first adjusted display panel, which has a normal target Gamma value;

[0043] Step S2: Perform optical compensation on the adjusted display panel; and

[0044] Step S3: Adjust the optically compensated display panel to obtain the second adjusted display panel. The second adjusted display panel has an actual Gamma value, which is different from the normal target Gamma value.

[0045] Step S2 is located between steps S1 and S3.

[0046] In this embodiment, the Gamma correction process of the display panel is carried out in two steps. In the first step of the adjustment process, the first correction of the Gamma value is completed, and the initial Gamma value of the display panel is adjusted to the normal target Gamma value. The normal target Gamma value is the Gamma value that will not have an adverse effect on the subsequent optical compensation process of the display panel. Typically, the normal target Gamma value is in the range of 2.0 to 2.4, and can be adjusted according to the actual production situation.

[0047] Subsequently, based on this normal target Gamma value, optical compensation is completed for the display panel after the first adjustment. It should be noted that in this embodiment, the optical compensation is a process of repairing mura that appears on the display panel. The optical compensation process is completed in the demura adjustment device.

[0048] After optical compensation is completed, the display panel is adjusted in the second step. During the second step, the Gamma value is corrected for the second time, so that the Gamma value is adjusted from the normal target Gamma value to the actual Gamma value. The actual Gamma value is different from the normal target Gamma value. The actual Gamma value enables the prepared display panel to meet the display requirements of the terminal after it is applied to the terminal.

[0049] In this embodiment, the correction process of the display panel's Gamma value is divided into two steps. An optical compensation process for the display panel is interspersed between the first and second correction steps. Since a normal target Gamma value is obtained after the first correction, the impact of this normal target Gamma value on the brightness of the display panel's grayscale is negligible. Therefore, the first correction of the Gamma value will not adversely affect the optical compensation of the display panel. After optical compensation, the normal target Gamma value is further corrected to obtain the actual Gamma value. Compared to the prior art, where Gamma correction is implemented in a Gamma adjustment device, in this application, as shown... Figure 4 As shown, the first step of the Gamma value correction process is implemented in the Gamma adjustment device, while the second step of the Gamma value correction process is performed after optical compensation. Therefore, the second step of the Gamma value correction process is implemented in the Demura adjustment device.

[0050] Therefore, without affecting the optical compensation of the display panel, the Gamma value of the display panel was corrected, so that the display panel with the corrected Gamma value can meet the display requirements of the terminal after being applied to the terminal.

[0051] The actual Gamma value is greater than the normal target Gamma value. Typically, the normal target Gamma value ranges from 2.0 to 2.4, while the actual Gamma value ranges from 2.4 to 2.6. In this embodiment, considering that when the Gamma value reaches 2.6, the brightness of the grayscale of the display panel becomes significantly lower, directly affecting the camera's ability to capture the displayed image, the actual Gamma value cannot exceed 2.6.

[0052] Specifically, in this embodiment, step S3 includes:

[0053] Based on the backlight measurement curve of the terminal using the display panel and the backlight measurement curve of the display panel, the optically compensated display panel is adjusted to obtain the second adjusted display panel.

[0054] Please see Figure 1 ,like Figure 1 As shown, the backlight measurement curve of the terminal of the display panel and the backlight measurement curve of the display panel are two different curves. There is a Gamma gap between the two curves. Based on the existing Gamma gap, the display panel needs to be adjusted a second time to obtain the display panel after the second adjustment. After the second adjustment, the display panel has an actual Gamma value, which makes the display panel after the second adjustment suitable for terminal display.

[0055] Furthermore, in some embodiments, adjusting the optically compensated display panel to obtain a second adjusted display panel includes:

[0056] Get the current brightness of multiple bound point grayscale levels;

[0057] Based on the difference between the current brightness and the target brightness, generate brightness compensation values ​​for multiple gray levels of the binding points;

[0058] Based on the brightness compensation values ​​of the multiple binding point gray levels, brightness compensation values ​​of gray levels between adjacent binding point gray levels are generated, wherein the brightness compensation values ​​of the multiple binding point gray levels and the gray levels between adjacent binding point gray levels are used to be written to the storage module of the display panel.

[0059] In this embodiment, multiple binding points can be arbitrarily selected on the display panel. The gray levels of the multiple binding points are not completely the same. By lighting up the display panel, the current brightness of the gray levels of the multiple binding points can be obtained. The target brightness is the brightness of the display panel that is suitable for the terminal. Based on the current brightness and the target brightness, the brightness compensation value of the gray levels of the multiple binding points can be obtained. This brightness compensation value is the difference between the current brightness and the target brightness. Therefore, each gray level of the binding point corresponds to a brightness compensation value.

[0060] Subsequently, based on the acquired multiple binding point gray levels and the corresponding brightness compensation values, the brightness compensation values ​​of multiple gray levels between two adjacent binding point gray levels can be calculated.

[0061] Optionally, in this embodiment, the brightness compensation value of the gray level between adjacent binding point gray levels is generated by linear interpolation based on the brightness compensation values ​​of multiple binding point gray levels.

[0062] Linear interpolation is an approximate calculation method that uses a set of known values ​​of the independent variable of an unknown function and its corresponding function values ​​to find other values ​​of the unknown function using a geometric relationship. It is a solution method for finding approximate values ​​of unknown functions. In this embodiment, the known values ​​of the independent variable of the unknown function are multiple bound-point gray levels, and the corresponding function values ​​are the brightness compensation values ​​corresponding to the multiple bound-point gray levels. By using the multiple bound-point gray levels and their corresponding brightness compensation values, the brightness compensation curve corresponding to the gray levels of the display panel can be obtained, that is, the aforementioned unknown function can be obtained.

[0063] Optionally, in this embodiment, after obtaining the brightness compensation values ​​of multiple binding point gray levels and the gray levels between adjacent binding point gray levels, the obtained brightness compensation values ​​can be written into the storage module of the display panel for storage.

[0064] Furthermore, in some embodiments, such as Figure 5 As shown, step S2 includes:

[0065] S21. Turn on the display panel and obtain multiple display screens of the display panel;

[0066] S22. Perform mura recognition on multiple display screens and obtain mura data;

[0067] S23. Obtain the corresponding Demura data based on the mura data and the Demura compensation algorithm;

[0068] S24. Burn the Demura data into the storage module of the display panel.

[0069] Understandably, in this embodiment, when the display panel is lit, the display image can be captured by a CCD camera. CCD is short for charge coupled device. A CCD can convert light into electric charge and store and transfer the charge. It can also take out the stored charge to change the voltage. After capturing multiple display images by the CCD camera, mura recognition is performed on the multiple display images. Then, based on the acquired mura data and the Demura compensation algorithm, the corresponding Demura data is obtained. The Demura data is burned into the storage module of the display panel, thus completing the optical compensation of the display panel.

[0070] Furthermore, such as Figure 6 As shown, the present invention also provides a gamma correction device for a display panel, comprising:

[0071] The first adjustment module 100 is used to adjust the display panel to obtain the display panel after the first adjustment, wherein the display panel after the first adjustment has a normal target Gamma value;

[0072] Optical compensation module 200 is used to optically compensate the adjusted display panel;

[0073] The second adjustment module 300 is used to adjust the optically compensated display panel to obtain a second adjusted display panel, wherein the second adjusted display panel has an actual Gamma value, which is different from the normal target Gamma value.

[0074] The first adjustment module includes a brightness acquisition unit, a point-binding brightness compensation value generation unit, and a grayscale brightness compensation value generation unit. The brightness acquisition unit is used to acquire the current brightness of multiple point grayscale values. The point-binding brightness compensation value generation unit is used to generate brightness compensation values ​​for multiple point grayscale values ​​based on the difference between the current brightness and the target brightness. The grayscale brightness compensation value generation unit is used to generate brightness compensation values ​​for adjacent point grayscale values ​​based on the brightness compensation values ​​of the multiple point grayscale values.

[0075] The optical compensation module includes an image acquisition unit, a recognition unit, a data acquisition unit, and a burning unit. The image acquisition unit is used to light up the display panel and acquire multiple display images of the display panel. The recognition unit is used to perform mura recognition on the multiple display images and acquire mura data. The data acquisition unit is used to acquire the corresponding Demura data based on the mura data and the Demura compensation algorithm. The burning unit is used to burn the Demura data into the storage module of the display panel.

[0076] Optionally, in this embodiment, a storage module is also included, and the first adjustment module, the optical compensation module, and the second adjustment module are all electrically connected to the storage module.

[0077] In this embodiment, by electrically connecting the first adjustment module, the optical compensation module, and the second adjustment module to the storage module, it is beneficial to effectively burn the data obtained by the different modules into the storage module for storage.

[0078] Furthermore, the present invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the aforementioned Gamma correction method for the display panel. Specific examples have been used herein to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention; at the same time, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for Gamma correction of a display panel, characterized in that, include: Step S1: Adjust the display panel to obtain the display panel after the first adjustment, and the display panel after the first adjustment has a normal target Gamma value; Step S2: Perform optical compensation on the adjusted display panel; as well as Step S3: Adjust the display panel after optical compensation to obtain the display panel after a second adjustment. The display panel after the second adjustment has an actual Gamma value, which is greater than the normal target Gamma value. The normal target Gamma value ranges from 2.0 to 2.4, and the actual Gamma value ranges from 2.4 to 2.

6. Wherein, step S2 is located between step S1 and step S3; Step S2 includes: lighting up the display panel and acquiring multiple display images of the display panel; performing mura recognition on the multiple display images to acquire mura data; acquiring corresponding Demura data based on the mura data and the Demura compensation algorithm; and burning the Demura data into the storage module of the display panel.

2. The Gamma correction method for a display panel according to claim 1, characterized in that, Step S3 includes: Based on the backlight measurement curve of the terminal using the display panel and the backlight measurement curve of the display panel, the optically compensated display panel is adjusted to obtain the second adjusted display panel.

3. The Gamma correction method for a display panel according to claim 2, characterized in that, The process of adjusting the optically compensated display panel to obtain the second adjusted display panel includes: Get the current brightness of multiple bound point grayscale levels; Based on the difference between the current brightness and the target brightness, generate brightness compensation values ​​for multiple grayscale levels of the binding points; Based on the brightness compensation values ​​of the multiple binding point gray levels, brightness compensation values ​​of gray levels between adjacent binding point gray levels are generated, wherein the brightness compensation values ​​of the multiple binding point gray levels and the gray levels between adjacent binding point gray levels are used to be written to the storage module of the display panel.

4. The Gamma correction method for a display panel according to claim 3, characterized in that, The brightness compensation value between adjacent gray levels of the binding points is generated by linear interpolation based on the brightness compensation values ​​of the multiple binding point gray levels.

5. A gamma correction device for a display panel, characterized in that, include: The first adjustment module is used to adjust the display panel to obtain the display panel after the first adjustment, wherein the display panel after the first adjustment has a normal target Gamma value; An optical compensation module is used to perform optical compensation on the adjusted display panel; The second adjustment module is used to adjust the optically compensated display panel to obtain the second adjusted display panel, wherein the second adjusted display panel has an actual Gamma value, the actual Gamma value is greater than the normal target Gamma value, the normal target Gamma value ranges from 2.0 to 2.4, and the actual Gamma value ranges from 2.4 to 2.

6. The optical compensation module includes an image acquisition unit, a recognition unit, a data acquisition unit, and a burning unit. The image acquisition unit is used to light up the display panel and acquire multiple display images of the display panel. The recognition unit is used to perform mura recognition on the multiple display images and acquire mura data. The data acquisition unit is used to acquire corresponding Demura data based on the mura data and the Demura compensation algorithm. The burning unit is used to burn the Demura data into the storage module of the display panel.

6. The Gamma correction device for a display panel according to claim 5, characterized in that, It also includes the storage module, and the first adjustment module, the optical compensation module and the second adjustment module are all electrically connected to the storage module.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 4.

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