Display panel brightness compensation method

Abstract

The application discloses a display panel brightness compensation method, comprising the following steps: acquiring a reference image of a display panel captured by a camera when the display panel is parallel to the camera; acquiring an offset image of the display panel captured by the camera when the display panel is not parallel to the camera; acquiring an offset of any point on the offset image relative to the reference image; extracting center brightness information of the display panel based on the offset image; and calculating a brightness compensation value of the any point based on the offset and the center brightness information. The application can correspondingly acquire the brightness deviation compensation value when the offset is different by acquiring the offset of the point on the display panel when the display panel is not parallel to the camera to the reference image, thereby compensating the brightness of the panel and further obtaining the actual panel brightness. By the compensation method, the error between the acquired panel image data and the actual data caused by the position offset of the display panel is effectively reduced, the data precision of subsequent brightness compensation is improved, and the panel quality is further improved.

Description

Technical Field

[0001] This application belongs to the field of display technology, specifically relating to a method for brightness compensation of a display panel. Background Technology

[0002] When performing brightness compensation on a display panel, it is necessary to take a picture of the panel with a camera. However, in actual production, the mechanical components in the factory cause the camera and the panel to not be perfectly parallel due to their use. Therefore, when a picture of the panel is obtained, the size of the panel in the picture is smaller than the size when the two are parallel, resulting in missing and mismatched information in the picture. Summary of the Invention

[0003] Purpose of the invention: This application provides a display panel brightness compensation method to solve the data error caused by the non-parallelism of the existing camera and panel.

[0004] Technical solution: The display panel brightness compensation method described in this application includes the following steps: Acquire a reference image of the display panel captured by the camera when the display panel is parallel to the camera; Acquire a cheap image of the display panel captured by the camera when the display panel is not parallel to the camera; Obtain the offset of any point on the offset image relative to the reference image; Extract the center brightness information of the display panel based on the offset image; Based on the offset and the center brightness information, the brightness compensation value of any point is calculated.

[0005] In some embodiments, obtaining the offset of any point on the offset image relative to the reference image includes the following steps: Obtain the world coordinates of the points on the reference image; Obtain the world coordinates of the arbitrary point; Determine the world coordinates of the reference point on the reference image corresponding to the arbitrary point; Based on the world coordinates of the reference point and the world coordinates of the arbitrary point, a first distance between the arbitrary point and the reference point is calculated, and the first distance is the offset.

[0006] In some embodiments, the specific steps for obtaining the world coordinates of points on the reference image are as follows: The world coordinates of the center point and multiple boundary points of the reference image are determined. The region corresponding to the reference image is defined by the world coordinates of the multiple boundary points and the center point. All points on the reference image are within the region corresponding to the reference image defined by the world coordinates of the multiple boundary points and the center point.

[0007] In some embodiments, the specific steps for obtaining the world coordinates of the arbitrary point are as follows: Obtain the intrinsic parameter matrix of the camera; Obtain the world coordinates and two-dimensional coordinates of the center point of the reference image; Based on the intrinsic parameter matrix and the world coordinates and two-dimensional coordinates of the center point of the reference image, calculate the extrinsic parameters rotation vector R and translation vector t of the camera; Based on the extrinsic rotation vector R and the translation vector t, calculate the extrinsic parameter matrix [R|t] of the camera; Based on the extrinsic parameter matrix [R|t] and the world coordinates of all points in the reference image, calculate the world coordinates of any point in the offset image.

[0008] In some embodiments, calculating the extrinsic parameter matrix of the camera further includes the following steps: Select the world coordinate point of the offset image. The world coordinates of the reference image Substitute the nearest point (p, q) into the error function to minimize the value of the error function; The optimal rotation vector R and translation vector t are calculated using the error function and the nearest point (p, q). Based on the optimal rotation vector R and translation vector t, the optimal extrinsic parameter matrix [R|t] is calculated.

[0009] In some embodiments, the error function is: By iterating over the world coordinates of the offset image The world coordinates of the reference image The minimum value of the error function is obtained, and the extrinsic parameter matrix at this time is obtained.

[0010] In some embodiments, obtaining the offset of any point on the offset image relative to the reference image further includes the following steps: Obtain the world coordinates of the nearest points of multiple reference points; Based on the world coordinates of the multiple neighboring points and the world coordinates of the arbitrary point, calculate the second distance between the arbitrary point and the multiple neighboring points; Calculate the average distance between the first distance and the plurality of second distances, and the average distance is the offset.

[0011] In some embodiments, the formula for calculating the average distance is: ; in, These are the world coordinates of any given point. These are the world coordinates of the reference point or the nearest point; The formula for calculating the average distance is iterated to gradually reduce the average distance; When the number of iterations is greater than or equal to 100 or the iteration result is 0, the iteration stops, and the average distance at this time is selected as the minimum value of the offset.

[0012] In some embodiments, the formula for calculating the brightness compensation value of the point is: ; Where B represents the brightness compensation value at any point. This represents the minimum value of the offset. This indicates the distance from the center point of the panel to the camera. This indicates the center brightness information of the panel.

[0013] In some embodiments, the actual brightness value of the arbitrary point is: K i =L i +B; Among them, K i L represents the actual brightness value of any given point. i This represents the brightness value of any point captured by the camera.

[0014] Beneficial Effects: Compared with the prior art, the display panel brightness compensation method of this application includes the following steps: acquiring a reference image of the display panel captured by the camera when the display panel is parallel to the camera; acquiring an offset image of the display panel captured by the camera when the display panel is not parallel to the camera; acquiring the offset of any point on the offset image relative to the reference image; extracting the center brightness information of the display panel based on the offset image; and calculating the brightness compensation value of any point based on the offset and the center brightness information. This application, by acquiring the offset of a point on the panel from the reference image when the panel is not parallel to the camera, can correspondingly acquire the brightness deviation compensation value when the offset is different, thereby compensating for the panel brightness and obtaining the actual panel brightness. This compensation method effectively reduces the error between the acquired panel image data and the actual data caused by the positional offset of the display panel, improving the data accuracy of subsequent brightness compensation and thus improving panel quality. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, 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 this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of a display panel brightness compensation method according to an embodiment of this application; Figure 2 This is a detailed flowchart of a display panel brightness compensation method according to an embodiment of this application; Figure 3 This is a diagram showing the relative positions of the display panel and the camera in an embodiment of this application; Figure 4 This is a side view showing the relative positional relationship between the display panel and the camera in an embodiment of this application. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0018] In the description of this application, it should be understood that the terms "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, and "at least one" can mean one, two, or more, unless otherwise explicitly specified. In the description of this application, "perpendicular" means completely perpendicular to 90° or almost completely perpendicular, for example, the range of included angles between 80° and 100° is considered perpendicular. Similarly, "parallel" means completely parallel or almost completely parallel, for example, the range of completely parallel angles between 10° is considered parallel.

[0019] The display panel positioning fixture itself is fixed in position. However, due to installation, disassembly, or clamping and releasing operations during use, the mechanical components may deflect at an angle. Therefore, when the panel is fixed to the mechanical components for image acquisition, the center point of the panel usually remains unchanged, while the two fixing points on either side deviate in position, resulting in the panel not being parallel to the camera.

[0020] Combination Figures 1-4 A display panel brightness compensation method according to an embodiment of this application includes the following steps: S100: Acquire a reference image of the display panel captured by the camera when the display panel is parallel to the camera.

[0021] Specifically, such as Figure 1 and Figure 2 As shown, after the initial installation and calibration of the display panel fixture, the display panel is fixed onto the fixture. Since the fixture has been calibrated, it is in a reference position, and the camera is set to a predetermined position. At this point, the camera and the display panel are parallel to each other. An image of the display panel at this moment is then captured by the camera and used as a reference image. Because the display panel fixture may experience angular deflection after prolonged use, subsequent image acquisitions of the display panel will show corresponding deviations. Therefore, initially acquiring a complete image of the display panel with it parallel to the camera facilitates subsequent correction of any image deviations.

[0022] It should be noted that because the reference image is unoffset, the positional information of each point on the reference image is accurate. Therefore, using the positional information of each point in the reference image as a standard, the offset image of the display panel can be corrected. By calibrating the world coordinates of the four corners and the center point of the reference image, the positional information of all points in the display reference image can be obtained. This facilitates the subsequent acquisition of coordinates for the offset image of the offset panel.

[0023] It should also be noted that since the position offset of the display panel is usually an axial deflection centered on a fixed point, the center position of the display panel remains unchanged. However, positions other than the center will be offset accordingly. Therefore, it is necessary to obtain the image information of the entire display panel as a reference image to obtain the position information of all points in the reference image of the display panel.

[0024] S200: Acquire the offset image of the display panel captured by the camera when the display panel is not parallel to the camera.

[0025] It should be noted that the offset image of the display panel obtained at this time is the image of the display panel that deviates from the reference image due to the positional shift of the display panel.

[0026] It should also be noted that the offset image is a full-screen image of the display panel taken by the camera. The brightness information of each point on the display panel at this time is obtained by using the offset image, which makes it easy to perform brightness compensation for all points on the display panel.

[0027] It should also be noted that the position information of each point in the offset image will deviate from the position information of the corresponding point in the reference image of the display panel, so the position information of the offset image needs to be corrected.

[0028] S300: Obtain the offset of any point on the offset image relative to the reference image; including the following steps: S310: Obtain the world coordinates of points on the reference image; specifically, calibrate the world coordinates of the center point and multiple boundary points of the reference image, and define the region corresponding to the reference image by the world coordinates of the multiple boundary points and the center point. All points on the reference image are within the region corresponding to the reference image defined by the world coordinates of the multiple boundary points and the center point.

[0029] In this embodiment, by calibrating the center point and multiple boundary points of the reference image, the reference image can be defined using the center point and multiple boundary points, thus defining the region of the reference image within world coordinates. Therefore, points on the reference image can be selected within this region, and the world coordinates of the points on the reference image can be determined.

[0030] It should be noted that, in this embodiment, the position of the panel when it is parallel to the camera is the reference standard of this application. Therefore, its position information is all known information, which facilitates various subsequent calculations. The position information and size information of the panel in the standard position are known. Therefore, it is assumed that the center coordinates and boundary point coordinates marked on the corresponding reference image are known, which facilitates the determination of the area corresponding to the reference image and the subsequent selection of the world coordinates of each point in the reference image.

[0031] It should also be noted that the boundary points in this embodiment are no less than four, to ensure the accuracy of the range determination. For a square display panel, the corresponding points can be the center point and the four corner points, thus determining the area of ​​the display panel.

[0032] S320: Obtain the world coordinates of any point; the specific steps are as follows: S321: Obtain the camera's intrinsic parameter matrix; Since the camera is a known device, each camera's various configuration parameters are published at the factory, including the camera's intrinsic parameter matrix information. Therefore, the corresponding intrinsic parameter matrix can be obtained directly based on the camera's specifications and model.

[0033] S322: Obtain the world coordinates and two-dimensional coordinates of the center point of the reference image; S323: Based on the intrinsic parameter matrix and the world and two-dimensional coordinates of the center point of the reference image, calculate the camera's extrinsic rotation vector R and translation vector t; S324: Calculate the camera's extrinsic parameter matrix [R|t] based on the extrinsic rotation vector R and translation vector t; specifically, the following steps are included: Select the world coordinate point of the offset image. world coordinates of the reference image Substitute the nearest point (p, q) into the error function to minimize the value of the error function; The optimal rotation vector R and translation vector t are calculated using the error function and the nearest point (p, q). Based on the optimal rotation vector R and translation vector t, the optimal extrinsic parameter matrix [R|t] is calculated.

[0034] Furthermore, the error function is: World coordinates through the iterating panel world coordinates of the reference image We obtain the minimum value of the error function and the optimal extrinsic parameter matrix at this point.

[0035] It should be noted that the world coordinates of all points on the panel at the aforementioned actual location are used. world coordinates of all points on the reference image Substituting into the error function, find and Calculate the optimal camera extrinsic rotation vector R and translation vector t from the closest point (p, q) to determine the optimal camera extrinsic matrix [R|t], and thus obtain more accurate world coordinates for all points on the actual panel.

[0036] S325: Calculate the world coordinates of any point in the offset image based on the extrinsic parameter matrix [R|t] and the world coordinates of all points in the reference image.

[0037] In this embodiment, the display panel is deflected around a straight line containing its center point. Therefore, the center point of the display panel coincides with the center point of the panel at the standard position. Consequently, the world coordinates of the center point of the offset image captured by the panel at the actual position are the same as the world coordinates of the center point of the reference image captured by the panel at the standard position. Therefore, based on the camera's intrinsic parameter matrix and the world and two-dimensional coordinates of the center point of the reference image (or the world and two-dimensional coordinates of the center point of the offset image of the panel at the actual position), the camera's extrinsic rotation vector R and translation vector t can be calculated; further, the camera's extrinsic parameter matrix [R|t] can be calculated. Based on the camera's extrinsic parameter matrix [R|t], intrinsic parameter matrix, and the world coordinates Q of all points in the reference image, the world coordinates P of all points on the panel at the actual position can be calculated.

[0038] S330: Determine the world coordinates of the reference point on the reference image corresponding to any point; that is, it is equivalent to obtaining the world coordinates of any point on the reference image.

[0039] S340: Based on the world coordinates of the reference point and the world coordinates of any point, calculate the first distance between the arbitrary point and the reference point. The first distance is the offset.

[0040] It should be noted that in this embodiment, when the panel position deviates, the position of each point on it relative to the panel in its standard position undergoes a rotation process. Therefore, in this embodiment, the point on the panel at the standard position corresponding to the point on the panel after the actual offset is not the vertical distance from the point on the panel after the actual offset to the panel at the specimen position. Therefore, directly taking the vertical distance would cause compensation errors. Therefore, in this embodiment, the world coordinates (i.e., three-dimensional coordinates) of the points on the actual panel are obtained, and the world coordinates of the points on the reference image are also obtained. The world coordinates of the points on the reference image and the actual panel are determined, and the distance between the two points is calculated as the offset.

[0041] S350: Obtain the world coordinates of neighboring points of multiple reference points. This is equivalent to obtaining the world coordinates of all points within a small area. For example, the display panel is divided into 256 areas arranged in an array, where each area has a reference point, and the points in that area other than the reference point are the neighboring points of that reference point.

[0042] S360: Calculates the second distance between any point and multiple neighboring points based on the world coordinates of multiple nearby points and the world coordinates of any point; S370: Calculate the average distance between the first distance and multiple second distances. The average distance is the offset.

[0043] It should be noted that, due to the error in determining the camera extrinsic matrix, the world coordinates of any point in the corresponding offset image will also have a certain deviation. Therefore, the reference point corresponding to any point in the reference image may not be the actual reference point corresponding to that point. Therefore, when determining the offset, this application selects multiple neighboring points around the reference point and calculates the second distance between the arbitrary point and the multiple neighboring points. Furthermore, it calculates the average of the distances between the arbitrary point and the reference point and the multiple neighboring points. This can further reduce the error of the offset.

[0044] It should be noted that since the actual panel offset may be in any direction, this embodiment selects the average distance as the offset between the point on the actual panel and the reference image, which can effectively reduce the offset error.

[0045] Furthermore, in this embodiment, any point in the offset image can actually correspond to a small area in a specific panel, that is, it can actually be 5. 5 or 7 7 or 10 A small region of 10 corresponds to many points taken within this region. These points have similar offset ranges, are all near the reference point, and are all neighboring points of the reference point. For example, the center point involved in this embodiment can be a small region at the center of the reference image. Therefore, using the average distance can take an average of the distances corresponding to the points within this small region, which can reduce errors.

[0046] In some embodiments, the formula for calculating the average distance is: ; Where d represents the average distance. Represents the world coordinates of any point. Represents the world coordinates of a reference point or a nearby point, where n represents the number of arbitrary points and i represents any one of the n points.

[0047] In this embodiment, the coordinates of any point are selected in the world coordinates of the offset image, and then a reference point on the reference image corresponding to the arbitrary point and nearby points near the reference point are selected. These are substituted into the average distance calculation formula to calculate the average distance between multiple nearby points on the reference image and the reference point and the arbitrary point in the offset image. The offset of the point on the actual position panel from the point on the standard position panel is selected by calculating the average value.

[0048] Furthermore, the minimum offset of any point from the reference image can be calculated. Specific methods include: Multiple neighboring points near the reference point in the world coordinates of the reference image are selected, and the formula for calculating the average distance is iterated to gradually reduce the average distance. When the number of iterations is greater than or equal to 100 or the iteration result is 0, the iteration stops. At this time, the average distance is the minimum value of the offset corresponding to any point.

[0049] Since the average distance is the average distance between a point in the offset image and the world coordinates of points in multiple reference images, the more values ​​taken, the more accurate the value. Furthermore, because the range of values ​​is large, to obtain the minimum offset, the coordinates of a selected point are used to gradually decrease the average distance, and at least 100 iterations are performed towards this target to obtain the minimum offset of that point relative to the actual reference image.

[0050] It should be noted that when selecting coordinate points on the reference image, it is better to select points that are close to the corresponding reference point in the reference image (nearest points) to achieve more accurate values ​​and ensure the effectiveness of the selected parameters.

[0051] S400: Extracts center brightness information of the display panel based on the offset image.

[0052] It should be noted that this application addresses brightness compensation for cases where the display panel is deflected along its central axis. Therefore, the center position of the display panel remains unchanged, and the brightness information at the center of the corresponding reference image is the same as the brightness at the center of the deflected image. The brightness information corresponding to the center point of the deflected image can be directly extracted and considered as the brightness information of the center point of the display panel.

[0053] S500: Calculates the brightness compensation value for any point based on the offset and center brightness information.

[0054] Specifically, the formula for calculating the brightness compensation value at any point is: ; Where B represents the brightness compensation value of the point, in nits; This represents the minimum offset, in millimeters. This indicates the distance from the center point of the panel to the camera. Indicates the center brightness information of the panel; B and The unit is nits. and The unit is millimeters.

[0055] In this embodiment, based on the minimum offset of any point in the offset image to the corresponding point in the reference image's three-dimensional coordinates, the obtained brightness value of the center point, and the distance between the camera and the panel's center point, the brightness compensation value corresponding to any point is calculated proportionally. Specifically, in this embodiment, the ratio of the minimum offset to the distance from the center point of the display panel to the camera is equal to the ratio of the brightness compensation value to the brightness of the panel's center point; they are proportional. Therefore, by calculating the minimum offset and the ratio of the offset to the distance from the center point of the display panel to the camera, and then multiplying this by the brightness of the panel's center point, the brightness compensation value of any point on the offset image can be obtained.

[0056] Furthermore, after obtaining the brightness compensation value, the actual brightness value of the arbitrary point is obtained, and the two are added together to obtain the corrected actual brightness value of the arbitrary point. Specifically, the actual brightness value of any point on the offset image is: K i =L i +B; Among them, K i L represents the actual brightness value of the point. i Let i represent the brightness value of any point captured by the camera, and K represent any point on the offset image. i and L i All units are nits.

[0057] It should be noted that in the embodiments of this application, both the reference image and the offset image are white 255 images, which facilitates the uniform acquisition of brightness information of each point.

[0058] Therefore, in this embodiment of the application, the brightness compensation of the display panel is mainly based on the position when the panel is parallel to the camera. The position offset of each point on the panel is obtained when the panel is not parallel to the camera. Since the center point of the panel is not offset, the compensation value of each point can be calculated by obtaining the brightness of the center point of the panel and using the brightness of the center point of the panel as a reference, combined with the obtained position offset of each point.

[0059] This application embodiment obtains the brightness compensation value of each point based on the offset of each point on the offset image relative to the reference image. When the panel position is not parallel to the camera, the brightness information of the panel image captured by the camera is compensated and corrected, which effectively reduces the error between the panel data obtained by the camera and the actual data, thereby obtaining the actual panel brightness data. This can improve the data accuracy of subsequent Demura compensation (removal of brightness unevenness compensation) or gamma compensation, and improve product quality.

[0060] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0061] The above provides a detailed description of a display panel brightness compensation method provided in the embodiments of this application, and uses specific examples to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the technical solution and core idea of ​​this application. Those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A method for compensating brightness of a display panel, characterized in that, Includes the following steps: Acquire a reference image of the display panel captured by the camera when the display panel is parallel to the camera; Obtain the offset image of the display panel captured by the camera when the display panel is not parallel to the camera; Obtain the offset of any point on the offset image relative to the reference image, and perform iterative calculation on the offset to obtain the minimum value of the offset corresponding to the arbitrary point; Extract the center brightness information of the display panel based on the offset image; Obtain the distance from the center point of the display panel to the camera; Calculate the ratio of the minimum offset corresponding to any point to the distance, and multiply the ratio by the center brightness information to obtain the brightness compensation value of the arbitrary point.

2. The display panel brightness compensation method according to claim 1, characterized in that, Obtaining the offset of any point on the offset image relative to the reference image includes the following steps: Obtain the world coordinates of the points on the reference image; Obtain the world coordinates of the arbitrary point; Determine the world coordinates of the reference point on the reference image corresponding to the arbitrary point; Based on the world coordinates of the reference point and the world coordinates of the arbitrary point, a first distance between the arbitrary point and the reference point is calculated, and the first distance is the offset.

3. The display panel brightness compensation method according to claim 2, characterized in that, The specific steps for obtaining the world coordinates of points on the reference image are as follows: The world coordinates of the center point and multiple boundary points of the reference image are determined. The region corresponding to the reference image is defined by the world coordinates of the multiple boundary points and the center point. All points on the reference image are within the region corresponding to the reference image defined by the world coordinates of the multiple boundary points and the center point.

4. The display panel brightness compensation method according to claim 3, characterized in that, The specific steps to obtain the world coordinates of any point are as follows: Obtain the intrinsic parameter matrix of the camera; Obtain the world coordinates and two-dimensional coordinates of the center point of the reference image; Based on the intrinsic parameter matrix and the world coordinates and two-dimensional coordinates of the center point of the reference image, calculate the extrinsic parameters rotation vector R and translation vector t of the camera; Based on the extrinsic rotation vector R and the translation vector t, calculate the extrinsic parameter matrix [R|t] of the camera; Based on the extrinsic parameter matrix [R|t] and the world coordinates of all points in the reference image, calculate the world coordinates of any point in the offset image.

5. The display panel brightness compensation method according to claim 4, characterized in that, Calculating the extrinsic parameter matrix of the camera further includes the following steps: Select the world coordinate point of the offset image. The world coordinates of the reference image Substitute the nearest point (p, q) into the error function to minimize the value of the error function; The optimal rotation vector R and translation vector t are calculated using the error function and the nearest point (p, q). Based on the optimal rotation vector R and translation vector t, the optimal extrinsic parameter matrix [R|t] is calculated.

6. The display panel brightness compensation method according to claim 5, characterized in that, The error function is: By iterating over the world coordinates of the offset image The world coordinates of the reference image The minimum value of the error function is obtained, and the extrinsic parameter matrix at this time is obtained.

7. The display panel brightness compensation method according to claim 2, characterized in that, The step of obtaining the offset of any point on the offset image relative to the reference image further includes the following steps: Obtain the world coordinates of the nearest points of multiple reference points; Based on the world coordinates of the multiple neighboring points and the world coordinates of the arbitrary point, calculate the second distance between the arbitrary point and the multiple neighboring points; Calculate the average distance between the first distance and the plurality of second distances, and the average distance is the offset.

8. The display panel brightness compensation method according to claim 7, characterized in that, The formula for calculating the average distance is: ； in, These are the world coordinates of any given point. These are the world coordinates of the reference point or the nearest point; The formula for calculating the average distance is iterated to gradually reduce the average distance; When the number of iterations is greater than or equal to 100 or the iteration result is 0, the iteration stops, and the average distance at this time is selected as the minimum value of the offset corresponding to the arbitrary point.

9. The display panel brightness compensation method according to claim 1, characterized in that, The actual brightness value of any point is: K i =L i +B; Among them, K i L represents the actual brightness value of any given point. i B represents the brightness value of any point captured by the camera, and B represents the brightness compensation value of the arbitrary point.

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