Brightness acquisition method, device and equipment of display panel and storage medium

Abstract

The application discloses a brightness acquisition method and device of a display panel, equipment and a storage medium. The method comprises the following steps: in the case that a first display panel displays an image picture, the first display panel is photographed to obtain a photographed picture; a plurality of brightness detection points and corresponding photographed brightness values are determined from the photographed picture; actual brightness values corresponding to each photographed brightness value are determined according to a brightness calibration relationship of each brightness detection point; and the brightness calibration relationship is a corresponding relationship between the photographed brightness value and the actual brightness value. According to the embodiment of the application, the actual brightness values of the plurality of brightness detection points can be acquired by directly photographing the image picture, and compared with the brightness test mode of moving the optical equipment one by one to test the brightness of each brightness detection point, the time consumed by the brightness test can be reduced, and the efficiency of brightness acquisition is improved.

Description

Technical Field

[0001] This application belongs to the field of display panel technology, and particularly relates to a method, apparatus, device and storage medium for obtaining the brightness of a display panel. Background Technology

[0002] With the continuous development of display panel technology, OLED (Organic Light-Emitting Diode) devices and other light-emitting devices have been gradually applied to various display panel products such as mobile phones, tablets, and laptops.

[0003] Under the same data signal, light-emitting sub-pixels at different locations in a display panel may produce different brightness levels. For example, due to the resistance of the power signal traces, the power supply voltage received by light-emitting sub-pixels in different areas may not be the same, resulting in differences in actual brightness. To reduce the brightness differences between different light-emitting sub-pixels and improve the display uniformity of the display panel, brightness compensation needs to be performed on each light-emitting sub-pixel during the production process. After brightness compensation, the actual brightness of each area of ​​the display panel is measured to determine the actual compensation effect.

[0004] In existing technologies, after brightness compensation is performed on the display panel, optical devices such as color analyzers or luminance meters are typically used to obtain the actual luminous brightness of each area of ​​the display panel. These optical devices can only detect brightness in fixed areas. When detecting brightness in each display area, a mechanical device is needed to position and move the optical device, thereby sequentially measuring the brightness of each display area. This brightness detection method consumes a significant amount of measurement and movement time, severely impacting the display panel's takt time (TT) and reducing production efficiency. Summary of the Invention

[0005] This application provides a method, apparatus, device, and storage medium for obtaining the brightness of a display panel, which can improve the technical problem that the existing technology has a long time consumption for brightness detection of display panels, which affects production efficiency.

[0006] In a first aspect, embodiments of this application provide a method for obtaining the brightness of a display panel, the method comprising:

[0007] With the image displayed on the first display panel, a photograph is taken of the first display panel to obtain a photographed image;

[0008] Multiple brightness detection points and their corresponding brightness values ​​are determined from the captured images;

[0009] The actual brightness value corresponding to each captured brightness value is determined based on the brightness calibration relationship of each brightness detection point; the brightness calibration relationship is the correspondence between the captured brightness value and the actual brightness value.

[0010] In some embodiments, before capturing an image on the first display panel to obtain the captured image, the method further includes:

[0011] Drive the second display panel to display images under different brightness levels;

[0012] When the image is displayed on the second display panel at each illumination level, the calibrated brightness value is obtained by the brightness detection module through brightness detection at each brightness detection point of the second display panel.

[0013] While the second display panel displays the image at each illumination level, the second display panel is photographed to obtain a calibration image;

[0014] Based on the captured brightness values ​​of each brightness detection point in the calibration image and the calibrated brightness values ​​of each brightness detection point under different luminous brightness, the brightness calibration relationship of each brightness detection point is determined.

[0015] In some embodiments, the brightness calibration relationship of each brightness detection point is determined based on the captured brightness value of each brightness detection point in the calibration image and the calibrated brightness value of each brightness detection point under different luminous intensities, including:

[0016] Based on the captured brightness value and the calibrated brightness value corresponding to the brightness detection point in the calibration image under different luminous brightness, the multiple captured brightness values ​​are mapped to the multiple calibrated brightness values ​​respectively;

[0017] For every two adjacent captured brightness values, a brightness interpolation fitting relationship is generated between the two captured brightness values ​​based on a preset interpolation algorithm and the calibrated brightness values ​​corresponding to the two captured brightness values ​​respectively; the brightness interpolation fitting relationship is used to represent the correspondence between the captured brightness value and the actual brightness value;

[0018] The brightness calibration relationship corresponding to the brightness detection point is determined based on multiple brightness interpolation fitting relationships.

[0019] In some embodiments, when an image is displayed on the first display panel, taking a picture of the first display panel to obtain a captured image includes:

[0020] Drive the first display panel to display images at different brightness levels and / or at different grayscale levels;

[0021] With different images displayed on the first display panel, the display panel is photographed separately to obtain multiple images.

[0022] In some embodiments, determining multiple brightness detection points and their corresponding brightness values ​​from a captured image includes:

[0023] Based on the positioning algorithm of the brightness detection points, multiple brightness detection points are determined from the captured image; each brightness detection point includes at least one light-emitting unit, and each light-emitting unit includes at least three light-emitting sub-pixels with different light-emitting colors.

[0024] In some embodiments, after determining the actual brightness value corresponding to each captured brightness value according to the brightness calibration relationship of each brightness detection point, the method further includes:

[0025] The uniformity parameters of the first display panel are determined based on the maximum and minimum brightness values ​​among multiple actual brightness values.

[0026] The uniformity test results of the first display panel are determined based on the uniformity parameters.

[0027] In some embodiments, the image is captured by a camera component capturing an image of the first display panel;

[0028] The imaging component is also used to capture images of a single-color image on the first display panel for brightness compensation; the single-color image is an image of multiple light-emitting sub-pixels of the same emitting color emitting light.

[0029] Secondly, embodiments of this application provide a brightness acquisition device for a display panel, the device comprising:

[0030] The shooting module is used to take a picture of the first display panel when the image is displayed on the first display panel, so as to obtain a captured picture;

[0031] The positioning module is used to determine multiple brightness detection points and their corresponding brightness values ​​from the captured image;

[0032] The brightness module is used to determine the actual brightness value corresponding to each captured brightness value according to the brightness calibration relationship of each brightness detection point; the brightness calibration relationship is the correspondence between the captured brightness value and the actual brightness value.

[0033] Thirdly, embodiments of this application provide a brightness acquisition device for a display panel, the brightness acquisition device for the display panel including: a processor and a memory storing computer program instructions;

[0034] When the processor executes computer program instructions, it implements the brightness acquisition method of the display panel in the above embodiments.

[0035] Fourthly, embodiments of this application provide a computer storage medium storing computer program instructions, which, when executed by a processor, implement the brightness acquisition method for the display panel described above.

[0036] Compared with existing technologies, the brightness acquisition method, apparatus, device, and storage medium for a display panel provided in this application embodiment allow the apparatus to capture an image of the display area of ​​the first display panel while an image is displayed on the first display panel, thereby obtaining a captured image. Based on the captured image, multiple brightness detection points can be located within the image range corresponding to the display area, and the captured brightness value of each brightness detection point can be determined based on the light-emitting sub-pixels contained in each brightness detection point. For each brightness detection point, the actual brightness value corresponding to the captured brightness value can be determined according to its corresponding brightness calibration relationship. Compared to the method of moving optical devices one by one to perform brightness testing, obtaining the actual brightness value of each brightness detection point by directly capturing an image reduces the time consumed by brightness testing and improves the efficiency of brightness acquisition. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the 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.

[0038] Figure 1 This is a schematic flowchart of a method for obtaining the brightness of a display panel according to an embodiment of this application;

[0039] Figure 2 This is a flowchart illustrating a method for obtaining the brightness of a display panel according to another embodiment of this application;

[0040] Figure 3 This is a flowchart illustrating a method for obtaining the brightness of a display panel according to another embodiment of this application;

[0041] Figure 4 This is a flowchart illustrating a method for obtaining the brightness of a display panel according to another embodiment of this application;

[0042] Figure 5 A schematic diagram of the structure of a brightness acquisition device for a display panel provided in an embodiment of this application;

[0043] Figure 6 This is a schematic diagram of the structure of a brightness acquisition device for a display panel provided in an embodiment of this application. Detailed Implementation

[0044] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples of this application.

[0045] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The embodiments will now be described in detail with reference to the accompanying drawings.

[0047] With the continuous development of display panel technology, OLED (Organic Light-Emitting Diode) devices and other light-emitting devices have been gradually applied to various display panel products such as mobile phones, tablets, and laptops.

[0048] Under the same data signal, light-emitting sub-pixels at different locations in a display panel may produce different brightness levels. For example, due to the resistance of the power signal traces, the power supply voltage received by light-emitting sub-pixels in different areas may not be the same, resulting in differences in actual brightness. To reduce the brightness differences between different light-emitting sub-pixels and improve the display uniformity of the display panel, brightness compensation needs to be performed on each light-emitting sub-pixel during the production process. After brightness compensation, the actual brightness of each area of ​​the display panel is measured to determine the actual compensation effect.

[0049] In existing technologies, after brightness compensation is performed on the display panel, optical devices such as color analyzers or luminance meters are typically used to obtain the actual luminous brightness of each area of ​​the display panel. These optical devices can only detect brightness in fixed areas. When detecting brightness in each display area, a mechanical device is needed to position and move the optical device, thereby sequentially measuring the brightness of each display area. This brightness detection method consumes a significant amount of measurement and movement time, severely impacting the display panel's time to react (TT) and reducing its production efficiency.

[0050] To address the aforementioned technical problems, embodiments of this application provide a method, apparatus, device, and storage medium for acquiring the brightness of a display panel. The method for acquiring the brightness of a display panel provided in this application embodiment will be described first below.

[0051] Figure 1 A flowchart illustrating a method for obtaining the brightness of a display panel according to an embodiment of this application is shown. The method for obtaining the brightness of the display panel includes:

[0052] S110: While the image is displayed on the first display panel, a photograph is taken of the first display panel to obtain a photographed image;

[0053] S120 determines multiple brightness detection points and their corresponding brightness values ​​from the captured image;

[0054] S130, determine the actual brightness value corresponding to each captured brightness value according to the brightness calibration relationship of each brightness detection point; the brightness calibration relationship is the correspondence between the captured brightness value and the actual brightness value.

[0055] The brightness acquisition method for a display panel provided in this embodiment can be applied to a brightness acquisition device for a display panel. This device can determine the actual brightness values ​​of each brightness detection point on the display panel by capturing images through an imaging component while the display panel is displaying an image, thereby determining whether the uniformity of the display panel meets the target requirements. The display panel can be a PC, television, smart terminal, or tablet computer, etc. This embodiment does not limit the specific form of the display panel.

[0056] In this embodiment, the device can capture an image of the display area of ​​the first display panel while the first display panel is displaying an image, thereby obtaining a captured image. The captured image contains the captured brightness value of each light-emitting sub-pixel. Based on the captured image, multiple brightness detection points can be located within the image range corresponding to the display area, and the captured brightness value of each brightness detection point can be determined based on the light-emitting sub-pixels contained in each brightness detection point. For each brightness detection point, the actual brightness value corresponding to the captured brightness value can be determined according to its corresponding brightness calibration relationship. Compared to the method of moving the optical device one by one to perform brightness testing, obtaining the actual brightness value of each brightness detection point by directly capturing an image can reduce the time consumed by brightness testing and improve the efficiency of brightness acquisition.

[0057] In S110, the device can capture an image of the first display panel while the first display panel is displaying an image, and obtain the captured image.

[0058] During the panel testing process, the first display panel can be electrically connected to an image signal generator (PG, Pattern Generator), which outputs an image signal to drive the first display panel to display images. The device can integrate this image signal generator to drive the first display panel to display images.

[0059] When the first display panel displays an image, the imaging component can capture images of the display area of ​​the first display panel to obtain an image containing the brightness values ​​of each light-emitting sub-pixel in the first display panel. This imaging component can be a CCD (Charge Coupled Device) camera, a CMOS (Complementary Metal-Oxide-Semiconductor) camera, or other imaging devices capable of acquiring the brightness values ​​of the light-emitting sub-pixels on the display panel.

[0060] Please refer to Figure 2 As an optional embodiment, before S110 above, the following may also be included:

[0061] S210 drives the second display panel to display images under different brightness levels;

[0062] S220, when the second display panel displays the image at each luminance level, the calibrated luminance value obtained by the luminance detection module from the luminance detection points of the second display panel is acquired.

[0063] S230: When the second display panel displays the image at each brightness level, the second display panel is photographed to obtain a calibration image;

[0064] S240, based on the captured brightness values ​​of each brightness detection point in the calibration image and the calibrated brightness values ​​of each brightness detection point under different luminous brightness, determine the brightness calibration relationship of each brightness detection point.

[0065] In this embodiment, before capturing images of the first display panel and acquiring the brightness at each brightness detection point, the second display panel can be driven to display images with different luminous brightness levels to achieve brightness calibration of the captured images. For each image, the brightness can be detected at each brightness detection point using a brightness detection module to obtain a calibrated brightness value, or the image can be captured by an imaging component to obtain a calibration image. By mapping the captured brightness values ​​at each brightness detection point in the calibration image to the calibrated brightness values ​​at each brightness detection point, the correspondence between the captured brightness value and the actual brightness value at each brightness detection point can be obtained.

[0066] In S210, the aforementioned first display panel can be a display panel that requires brightness testing or brightness acquisition during the production testing process. That is, when each display panel is moved to the shooting position of the shooting component, it can serve as the first display panel to display the image, and the shooting component captures the image. Before each display panel is used as the first display panel for shooting, the shooting component needs to be calibrated to determine the correspondence between the shooting brightness parameter at a certain position in the captured image and the actual brightness at that position. The shooting brightness parameter can be the shooting brightness value at the corresponding position in the captured image.

[0067] During the calibration of the imaging component, it is necessary to drive the second display panel to display images under different brightness levels. Understandably, the second display panel can be a panel sample selected during the calibration of the imaging component. To ensure that the relevant parameters of the imaging component are as consistent as possible when shooting the first and second display panels, and to reduce the influence of external factors, the relative positional relationship between the second and first display panels and the imaging component should be consistent. Furthermore, the size of the display area of ​​the second display panel should also be consistent with the size of the display area of ​​the first display panel. This ensures that the actual position of each luminous sub-pixel in the captured image when the imaging component shoots the second display panel is consistent with the actual position of each luminous sub-pixel in the captured image when the imaging component shoots the first display panel.

[0068] In S220, when the second display panel displays images at various luminance levels, the brightness detection module can perform brightness detection at each brightness detection point on the second display panel to obtain multiple calibrated brightness values. The device can be electrically connected to the brightness detection module to obtain the calibrated brightness values.

[0069] Taking the second display panel displaying an image at a single luminous brightness as an example, when the second display panel displays the image, the brightness detection module can perform brightness detection on one of the brightness detection points on the second display panel to obtain the calibrated brightness value of that brightness detection point under the current luminous brightness.

[0070] After the brightness detection module completes the brightness detection at the current brightness detection point, it can move to the next brightness detection point and perform brightness detection at the next brightness detection point. This process continues until all brightness detection points on the second display panel have been detected. Then, the second display panel can be driven to display the image at the next luminous brightness. The brightness detection module can continue to move to perform brightness detection at each brightness detection point until the image at multiple luminous brightness levels has been detected.

[0071] Understandably, the aforementioned brightness detection module can be a color analyzer or a luminance meter. When performing brightness detection on a specific location on the display panel, the module needs to be moved to a suitable position to detect the brightness at that location. For example, when detecting the brightness at a location in the upper left corner of the display panel, the module can be moved directly above that location to perform the brightness detection. When detecting the brightness at the next location, the module needs to be moved directly above that location. In other words, when the display panel includes multiple brightness detection points, the module needs to be moved sequentially to the corresponding detection positions for each point to obtain the calibrated brightness value for each detection point.

[0072] In S230, while the second display panel displays images at various luminance levels, the device can also take a picture of the second display panel while displaying the image at each luminance level to obtain multiple calibration images. Each calibration image contains the captured luminance value of each luminous sub-pixel in the second display panel at the corresponding luminance level.

[0073] In step S240, the captured brightness value of each brightness detection point can be determined based on the luminous sub-pixels contained in each brightness detection point in the calibration image and the captured brightness value of each luminous sub-pixel. When a brightness detection point includes multiple luminous sub-pixels, the captured brightness value of that brightness detection point can be determined by the captured brightness values ​​corresponding to each of the multiple luminous sub-pixels. For example, the captured brightness value of the brightness detection point can be the average of the captured brightness values ​​corresponding to each of the multiple luminous sub-pixels, or it can be the median or weighted average of the multiple captured brightness values, or it can be calculated using a preset algorithm on the multiple captured brightness values.

[0074] Taking a single image with a single luminous intensity as an example, the captured brightness value of each brightness detection point is determined based on the calibration image corresponding to the image, and the calibration brightness value is obtained by the brightness detection module of the image from the brightness detection of each brightness detection point. Thus, a captured brightness value of each brightness detection point can be correlated with a calibration brightness value.

[0075] For an image with multiple luminance levels, the multiple captured luminance values ​​at each detection point can be individually mapped to multiple calibrated luminance values. By fitting a function to the multiple captured luminance values ​​and the multiple calibrated luminance values, the luminance calibration relationship for each luminance detection point can be obtained. This luminance calibration relationship can represent the correspondence between the captured luminance values ​​and the actual luminance values ​​at that luminance detection point.

[0076] After displaying the image using the second display panel and obtaining the brightness calibration relationships for each brightness detection point, multiple brightness calibration relationships can be stored. After the device drives the first display panel to display the image and captures a picture, for a certain brightness detection point, the captured brightness value can be obtained from the captured picture, and the actual brightness value corresponding to the captured brightness value can be obtained from the pre-stored brightness calibration relationships for that brightness detection point.

[0077] Please refer to Figure 3 As an optional embodiment, the above-described S240 may include:

[0078] S310, based on the captured brightness value and the calibrated brightness value corresponding to the brightness detection point in the calibration image under different luminous brightness, respectively, the multiple captured brightness values ​​are matched with the multiple calibrated brightness values;

[0079] S320 generates a brightness interpolation fitting relationship between two adjacent captured brightness values ​​based on a preset interpolation algorithm and the calibration brightness values ​​corresponding to the two captured brightness values ​​respectively; the brightness interpolation fitting relationship is used to represent the correspondence between the captured brightness value and the actual brightness value.

[0080] S330 determines the brightness calibration relationship corresponding to the brightness detection point based on multiple brightness interpolation fitting relationships.

[0081] In this embodiment, the number of images displayed on the second display panel is limited. Therefore, the captured brightness value and the calibrated brightness value at each brightness detection point correspond to multiple values. During actual brightness detection, if a captured brightness value is located between two nodes of captured brightness values, the corresponding actual brightness value cannot be determined. Therefore, for each pair of adjacent captured brightness values ​​and their corresponding calibrated brightness values, a brightness interpolation fitting relationship between the two captured brightness values ​​can be determined according to a preset interpolation algorithm. This ensures that even when the captured brightness value during actual detection is located between two nodes of captured brightness values, the corresponding actual brightness value can still be calculated through the brightness interpolation fitting relationship.

[0082] In S310, since the number of images displayed by the second display panel at different brightness levels is limited, taking a single brightness detection point as an example, after obtaining multiple calibrated brightness values ​​and their corresponding multiple captured brightness values, during the actual capture of the first display panel, if the captured brightness value is inconsistent with the multiple captured brightness values ​​in the brightness calibration relationship—for example, if the captured brightness value is located between two captured brightness values ​​in the brightness calibration relationship—the calibrated brightness value corresponding to that captured brightness value cannot be directly determined. Therefore, the multiple calibrated brightness values ​​and their corresponding multiple captured brightness values ​​can be fitted to ensure that the captured brightness value obtained from the actual capture of the first display panel can be determined according to the fitted functional relationship.

[0083] Taking a single brightness detection point as an example, based on the captured brightness value and the calibrated brightness value corresponding to that brightness detection point under different luminous brightness levels in each calibration image, multiple captured brightness values ​​can be mapped to multiple calibrated brightness values. Since both the captured brightness value and the calibrated brightness value increase accordingly when the luminous brightness increases, meaning there is a positive correlation between the captured brightness value and the calibrated brightness value, a fitting function can be used to fit multiple captured brightness values ​​to multiple calibrated brightness values.

[0084] In S320, in order to ensure the accuracy of the fitting curve between the captured brightness value and the calibrated brightness value, the curve can be fitted to every two captured brightness values ​​and their corresponding two calibrated brightness values. This fitting relationship can only reflect the correspondence between the captured brightness value and the calibrated brightness value within the range between the nodes of the two captured brightness values.

[0085] Taking two adjacent shooting brightness values ​​among multiple shooting brightness values ​​as an example, based on the two shooting brightness values ​​and their corresponding two calibration brightness values, a preset interpolation algorithm can be used to generate a brightness interpolation fitting relationship between the two shooting brightness values ​​and the two calibration brightness values. This brightness interpolation fitting relationship can be used to calculate the correspondence between the shooting brightness value and the actual brightness value within the interval between two adjacent shooting brightness values.

[0086] The aforementioned preset interpolation algorithm can be either a linear interpolation algorithm or a nonlinear interpolation algorithm; no restriction is imposed here.

[0087] In S330, after interpolating and fitting each two adjacent captured brightness values ​​and their corresponding two calibration brightness values ​​in multiple captured brightness values ​​to obtain multiple brightness interpolation fitting relationships, the multiple brightness interpolation fitting relationships can be used as the brightness calibration relationship corresponding to the brightness detection point.

[0088] After capturing an image of the image displayed on the first display panel, for a single brightness detection point, a corresponding brightness interpolation fitting relationship can be determined from multiple brightness interpolation fitting relationships corresponding to that brightness detection point, based on the captured brightness value in the image. The captured brightness value is then substituted into the brightness interpolation fitting relationship to obtain the corresponding actual brightness value.

[0089] As an optional embodiment, when the actual captured brightness value obtained by actually capturing the first display panel is between two adjacent captured brightness values ​​in the brightness calibration relationship, the calibration brightness value corresponding to one of the captured brightness values ​​that is closer to the actual captured brightness value can be directly used as the actual brightness value. Alternatively, the average of the two calibration brightness values ​​corresponding to the two captured brightness values ​​can be used as the actual brightness value. Or, the weighted average of the two calibration brightness values ​​can be calculated based on the relationship between the actual captured brightness value and the two captured brightness values ​​as the actual brightness value.

[0090] As an optional embodiment, the above-described S110 may include:

[0091] S410 drives the first display panel to display images at different brightness levels and / or at different grayscale levels.

[0092] The S420 takes multiple pictures of the display panel while different images are displayed on the first display panel.

[0093] In this embodiment, when acquiring the luminous brightness of the first display panel, each luminous sub-pixel can be driven to display an image with the same brightness level and grayscale value, or multiple images with different brightness levels or multiple images with different grayscale values ​​can be displayed respectively, thereby acquiring the actual brightness value of each brightness detection point of the first display panel under different luminous brightness.

[0094] In S410, the device can use an image signal generator to send different display driving signals to the first display panel so that the first display panel can display images at different brightness levels or at different grayscale levels.

[0095] The display panel can determine the brightness level corresponding to the brightness range (DBV Band) based on the display brightness value (DBV). For example, different brightness ranges can correspond to HDR (High Dynamic Range Imaging), HBM (High Brightness Monitor), and multiple Normal brightness levels. Under HDR and HBM brightness levels, each emitting pixel has a higher brightness value at its maximum grayscale. For instance, the brightness value of the display panel at the highest grayscale of the HDR brightness level can reach 1000 nits or more, and the brightness value of the display panel at the HBM brightness level can reach 700 nits or more. Multiple Normal brightness levels can correspond to 460 nits, 300 nits, 120 nits, 50 nits, 20 nits, 10 nits, 6 nits, or other luminous brightness levels, without limitation.

[0096] At a single brightness level, the display panel can display images of different grayscale levels within a range of grayscale values. The brightness value corresponding to the highest grayscale level at a single brightness level is the maximum brightness value of that brightness level. The brightness values ​​corresponding to other grayscale levels can be calculated based on the grayscale brightness formula and the Gamma parameter of the display panel.

[0097] In S420, when detecting the luminance of each position on the first display panel, it is possible to detect only the image of a single grayscale value at a single luminance level. For example, it is possible to detect an image of 255 grayscale values ​​at the HBM luminance level. The image captured by the imaging component at this time is an image of 255 grayscale values ​​at the HBM luminance level.

[0098] In addition, to improve the accuracy and reliability of brightness detection, the first display panel can be driven to display images at different brightness levels or different grayscale values, and the images can be captured by the imaging component.

[0099] The device can drive the display panel to display images with the same grayscale value at multiple brightness levels. For example, the device can drive the display panel to display images with 255 grayscale values ​​at various brightness levels such as HBM, Nor1, Nor2, or others, and capture images corresponding to 255 grayscale values ​​at each brightness level.

[0100] The device can also drive the display panel to display images corresponding to different gray levels of the same brightness level. For example, it can drive the display panel to display images at different gray levels of the HBM brightness level, such as 255, 224, 192, 128, 64, 32, and 16, and capture images corresponding to each gray level.

[0101] As an optional implementation, the device can also drive the display panel to display images with multiple grayscale values ​​at different brightness levels, and take pictures of each image to obtain the corresponding captured image.

[0102] In S120, after capturing the image, image processing can be performed on the captured image to identify the display area of ​​the first display panel contained in the captured image, and to identify each brightness detection point in the display area.

[0103] Taking the identification of a single brightness detection point as an example, after locating the brightness detection point in the captured image, the image range contained within the brightness detection point can be determined, and the multiple luminous sub-pixels contained within that image range can be identified. Since the captured image contains the captured brightness value of each luminous sub-pixel, the captured brightness value corresponding to the brightness detection point can be calculated based on the captured brightness values ​​corresponding to the multiple luminous sub-pixels within the image range.

[0104] By locating each brightness detection point separately, the light-emitting sub-pixels contained in each brightness detection point can be determined, and the corresponding shooting brightness value of each brightness detection point can be determined.

[0105] As an optional embodiment, the above-described S120 may include:

[0106] S510 determines multiple brightness detection points from the captured image based on the brightness detection point positioning algorithm; each brightness detection point includes at least one light-emitting unit, and each light-emitting unit includes at least three light-emitting sub-pixels with different light-emitting colors.

[0107] In this embodiment, after acquiring the captured image, the device can use a positioning algorithm to locate each brightness detection point in the captured image, so as to determine the image range corresponding to each brightness detection point in the captured image.

[0108] In one alternative implementation, the multiple brightness detection points in the display panel can be arranged in an array. The multiple brightness detection points can be located by pre-setting the distance between each row of brightness detection points and the distance between each column of brightness detection points.

[0109] In another optional implementation, the algorithm for locating the brightness detection points can also be based on the pixel size or physical size of the display panel. For example, after processing the captured image to obtain the pixel coordinates or physical coordinates of each luminous sub-pixel in the display area, each brightness detection point can be located from the captured image based on the pixel coordinates or physical coordinates corresponding to each pre-set brightness detection point.

[0110] Taking a single brightness detection point as an example, within the corresponding image area of ​​the captured image, a single brightness detection point should include at least one light-emitting unit, and this light-emitting unit should include at least three light-emitting sub-pixels with different emitting colors. The multiple light-emitting sub-pixels contained in the light-emitting unit can collectively emit white light. For example, a single light-emitting unit can contain red, green, and blue light-emitting sub-pixels.

[0111] Understandably, in one alternative implementation, the number of brightness detection points in the display panel can be 135. For example, the 135 brightness detection points can be arrayed and distributed across the display area of ​​the display panel, thereby enabling these brightness detection points to characterize the overall brightness of the display area.

[0112] In S130, after determining the shooting brightness value corresponding to each brightness detection point in the captured image, the actual brightness value corresponding to the shooting brightness value can be determined according to the brightness calibration relationship of each brightness detection point. The brightness calibration relationship represents the correspondence between the shooting brightness value and the actual brightness value.

[0113] Taking a single brightness detection point as an example, the brightness calibration relationship corresponding to this brightness detection point can be obtained by pre-displaying an image on the second display panel, performing brightness detection and capturing images using the brightness detection module and the imaging component respectively, and then storing the result in the device. Based on the captured brightness value corresponding to this brightness detection point, the device can determine the actual brightness value corresponding to the captured brightness value through the brightness calibration relationship.

[0114] For other brightness detection points, the pre-stored brightness calibration relationship for each brightness detection point can be obtained, and the actual brightness value corresponding to the captured brightness value of each brightness detection point can be determined.

[0115] Because the distance, tilt angle, and other parameters between the imaging component and the imaging component vary when the imaging component captures images of the display area of ​​the first display panel from a fixed position, the captured images will show differences in brightness values ​​obtained from different brightness detection points due to the influence of these parameters. For example, for two brightness detection points with the same luminous intensity, the captured brightness values ​​may not be the same due to the influence of parameters such as the shooting angle and shooting distance. Alternatively, for two brightness detection points with different luminous intensities, their corresponding captured brightness values ​​may be the same. Therefore, by pre-driving the second display panel to display images to calibrate the calibrated brightness values ​​and the captured brightness values, the correspondence between the captured brightness value and the calibrated brightness value of each brightness detection point can be determined. Thus, in the images captured from the first display panel, the actual brightness value corresponding to the captured brightness value can be accurately determined based on the brightness calibration relationship of each brightness detection point.

[0116] Compared to existing methods that use optical devices such as color analyzers or luminance meters, which involve continuously moving the shooting position of the optical device to sequentially detect brightness at each detection point, this embodiment uses an imaging component to capture the entire first display panel. The actual brightness value of each detection point can be determined from a single captured image, eliminating the need to move the display panel or the imaging component for multiple shots. This significantly reduces brightness acquisition time and improves efficiency. Furthermore, methods that rely on moving optical devices to detect brightness at each point are highly sensitive to distance errors. Large errors in distance can cause significant shifts in the detection points, affecting the results. In this embodiment, neither the first display panel nor the imaging component needs to move during the shooting process, thus avoiding movement errors and improving the positioning accuracy of the brightness detection points.

[0117] It should be noted that after determining the actual brightness values ​​corresponding to each brightness detection point in the first display panel, the multiple actual brightness values ​​corresponding to the first display panel can be converted into data that meets a preset format, or into a preset file type. For example, the multiple actual brightness values ​​can be converted into a table or CSV format for output. Other devices can then execute corresponding processes based on the tables or files output by the device.

[0118] Please refer to Figure 4 As an optional embodiment, after S130 above, the following may also be included:

[0119] S610, determine the uniformity parameter of the first display panel based on the maximum and minimum brightness values ​​among multiple actual brightness values;

[0120] S620 determines the uniformity test result of the first display panel based on the uniformity parameter.

[0121] In this embodiment, after determining the actual brightness values ​​of each brightness detection point of the first display panel based on the captured image, the uniformity parameter of the first display panel can be determined based on multiple actual brightness values, and the uniformity test result of the first display panel can be obtained through the uniformity parameter, thereby realizing the uniformity verification of the first display panel after brightness compensation.

[0122] In S610, after determining the actual brightness values ​​corresponding to each brightness detection point based on the captured image, the maximum and minimum brightness values ​​can be determined from multiple actual brightness values. The uniformity parameters of the first display panel are then determined based on the maximum and minimum brightness values.

[0123] It is understandable that a large difference between the maximum and minimum brightness values ​​indicates poor uniformity of the first display panel; while a small difference between the maximum and minimum brightness values ​​indicates good uniformity of the first display panel.

[0124] In one optional embodiment, the difference between the maximum and minimum brightness values ​​can be used as the uniformity parameter of the first display panel. Alternatively, the ratio of the difference between the maximum and minimum brightness values ​​can be calculated and used as the uniformity parameter of the first display panel. Other numerical calculation methods can also be used to calculate the uniformity parameter of the first display panel using the maximum and minimum brightness values; no limitation is imposed here.

[0125] In S620, after determining the uniformity parameter of a first display panel, this uniformity parameter can be compared with a preset parameter threshold. If the uniformity parameter is greater than the parameter threshold, it indicates that the uniformity of the first display panel is poor, and the corresponding uniformity test result is "failed." Conversely, if the uniformity parameter is less than the parameter threshold, it indicates that the uniformity of the first display panel is good, and the corresponding uniformity test result is "passed." When the uniformity test result is "passed," the test result can be further classified according to the uniformity parameter; for example, the uniformity test result can be further divided into "excellent," "good," and "qualified."

[0126] As an optional embodiment, the above-described imaging component can also capture a single-color image on the first display panel to perform brightness compensation for the first display panel.

[0127] The aforementioned single-color image is an image of multiple light-emitting sub-pixels of the same light-emitting color emitting light. After adjusting the Gamma of the first display panel, since multiple light-emitting sub-pixels of the same light-emitting color share the same Gamma register value, it is necessary to obtain the difference in luminous brightness of each light-emitting sub-pixel under the same Gamma register value and perform brightness compensation on each light-emitting sub-pixel.

[0128] During brightness compensation, multiple light-emitting sub-pixels of the same color need to be controlled to emit light independently. A camera is used to capture images of the display area, and brightness compensation is applied to each sub-pixel based on its actual brightness, ensuring that the brightness of each sub-pixel is nearly uniform. For example, if the first display panel includes light-emitting sub-pixels emitting red, green, and blue light, images of the red, green, and blue images can be captured separately to perform brightness compensation on the red, green, and blue light-emitting sub-pixels respectively.

[0129] After brightness compensation for each luminous sub-pixel, the imaging component and the first display panel can be kept stationary. The compensated luminous parameters drive each luminous sub-pixel to display a white image, and the imaging component continues to capture images of this white image to determine the actual brightness value of each brightness detection point. Based on the brightness differences between multiple actual brightness values, the uniformity after brightness compensation can be tested and verified to meet the target requirements.

[0130] Since the imaging component does not need to be moved when performing brightness compensation and brightness acquisition, the first display panel can complete brightness compensation and brightness acquisition in the same position. This effectively avoids the need to move the first display panel and imaging component during the uniformity test after compensation, avoids measurement errors caused by the movement of the display panel or imaging component, saves the connection time between the brightness compensation process and the brightness acquisition process, and improves the production and testing efficiency of the display panel.

[0131] This application embodiment also provides a brightness acquisition device for a display panel, such as... Figure 5 As shown, the device includes:

[0132] The shooting module 501 is used to take a picture of the first display panel when the image is displayed on the first display panel, and obtain a captured picture;

[0133] The positioning module 502 is used to determine multiple brightness detection points and their corresponding brightness values ​​from the captured image;

[0134] The brightness module 503 is used to determine the actual brightness value corresponding to each captured brightness value according to the brightness calibration relationship of each brightness detection point; the brightness calibration relationship is the correspondence between the captured brightness value and the actual brightness value.

[0135] As one implementation of this application, the brightness acquisition device for the display panel may further include:

[0136] The dot-screen module is used to drive the second display panel to display images under different brightness levels;

[0137] The brightness detection module is used to obtain the calibrated brightness value obtained by the brightness detection module from the brightness detection points of the second display panel when the image is displayed at each luminance level on the second display panel.

[0138] The calibration imaging module is used to capture images of the second display panel when the image is displayed at each illumination level, thereby obtaining calibration images.

[0139] The calibration module is used to determine the brightness calibration relationship of each brightness detection point based on the captured brightness value of each brightness detection point in the calibration image and the calibration brightness value of each brightness detection point under different luminous brightness.

[0140] As one implementation of this application, the above calibration module may include:

[0141] The corresponding unit is used to correspond multiple captured brightness values ​​with multiple calibrated brightness values ​​according to the captured brightness values ​​and calibrated brightness values ​​corresponding to the brightness detection points in the calibration image under different luminous brightness levels.

[0142] The interpolation fitting unit is used to generate a brightness interpolation fitting relationship between two adjacent captured brightness values ​​based on a preset interpolation algorithm and the calibration brightness values ​​corresponding to the two captured brightness values ​​respectively; the brightness interpolation fitting relationship is used to represent the correspondence between the captured brightness value and the actual brightness value;

[0143] The brightness calibration unit is used to determine the brightness calibration relationship corresponding to the brightness detection point based on multiple brightness interpolation fitting relationships.

[0144] As one implementation of this application, the above-mentioned shooting module 501 may include:

[0145] The dot-screen unit is used to drive the first display panel to display images at different brightness levels and / or at different grayscale levels.

[0146] The shooting unit is used to take pictures of the display panel when different images are displayed on the first display panel, thereby obtaining multiple pictures.

[0147] As one implementation of this application, the brightness acquisition device for the display panel may further include:

[0148] The calculation module is used to determine the uniformity parameters of the first display panel based on the maximum and minimum brightness values ​​among multiple actual brightness values;

[0149] The uniformity module is used to determine the uniformity test results of the first display panel based on the uniformity parameters.

[0150] Figure 6 A schematic diagram of the hardware structure of the brightness acquisition device for the display panel provided in an embodiment of this application is shown.

[0151] The brightness acquisition device for the display panel may include a processor 601 and a memory 602 storing computer program instructions.

[0152] Specifically, the processor 601 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0153] Memory 602 may include mass storage for data or instructions. For example, and not limitingly, memory 602 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where suitable, memory 602 may include removable or non-removable (or fixed) media. Where suitable, memory 602 may be internal or external to the brightness acquisition device of the display panel. In a particular embodiment, memory 602 is a non-volatile solid-state memory.

[0154] In a particular embodiment, memory 602 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Thus, generally, memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to one aspect of this disclosure.

[0155] The processor 601 reads and executes computer program instructions stored in the memory 602 to implement any of the brightness acquisition methods for the display panel in the above embodiments.

[0156] In one example, the brightness acquisition device for the display panel may further include a communication interface 603 and a bus 610. Wherein, as Figure 6 As shown, the processor 601, memory 602, and communication interface 603 are connected through bus 610 and complete communication with each other.

[0157] The communication interface 603 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0158] Bus 610 includes hardware, software, or both, that couples components of the brightness acquisition device for the display panel together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 610 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0159] Furthermore, in conjunction with the brightness acquisition method of the display panel in the above embodiments, this application embodiment can provide a computer storage medium for implementation. The computer storage medium stores computer program instructions; when these computer program instructions are executed by a processor, they implement any of the brightness acquisition methods of the display panel in the above embodiments.

[0160] It should be clarified that this application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0161] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0162] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0163] The aspects of this disclosure have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field-programmable logic circuit. It is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by special-purpose hardware performing the specified functions or actions, or can be implemented by a combination of special-purpose hardware and computer instructions.

[0164] The above are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A method for obtaining luminance of a display panel, characterized in that, The method comprises: In the case that the first display panel displays an image picture, the first display panel is photographed to obtain a photographed picture; A plurality of luminance detection points and corresponding photographed luminance values thereof are determined from the photographed picture; Actual luminance values corresponding to each photographed luminance value are determined according to a luminance calibration relationship of each luminance detection point; the luminance calibration relationship is a corresponding relationship between a photographed luminance value and an actual luminance value; Before the step of, in the case that the first display panel displays an image picture, the first display panel is photographed to obtain a photographed picture, the method further comprises: The second display panel is driven to display image pictures under different luminous luminance; When the second display panel displays an image picture under each luminous luminance, a calibration luminance value obtained by the luminance detection module performing luminance detection on each luminance detection point of the second display panel is acquired; When the second display panel displays an image picture under each luminous luminance, the second display panel is photographed to obtain a calibration picture; A luminance calibration relationship of each luminance detection point is determined according to photographed luminance values of each luminance detection point in the calibration picture and calibration luminance values of each luminance detection point under different luminous luminance.

2. The method of claim 1, wherein, The step of determining a luminance calibration relationship of each luminance detection point according to photographed luminance values of each luminance detection point in the calibration picture and calibration luminance values of each luminance detection point under different luminous luminance comprises: A plurality of photographed luminance values and a plurality of calibration luminance values are respectively corresponded according to photographed luminance values and calibration luminance values of the luminance detection point under different luminous luminance in the calibration picture; For each two adjacent photographed luminance values, a luminance interpolation fitting relationship between the two photographed luminance values is generated according to a preset interpolation algorithm and calibration luminance values respectively corresponding to the two photographed luminance values; the luminance interpolation fitting relationship is used for representing a corresponding relationship between a photographed luminance value and an actual luminance value; The luminance calibration relationship corresponding to the luminance detection point is determined according to a plurality of luminance interpolation fitting relationships.

3. The method of claim 1, wherein the display panel is a liquid crystal display panel. The step of, in the case that the first display panel displays an image picture, the first display panel is photographed to obtain a photographed picture, comprises: The first display panel is driven to display image pictures under different luminance levels and / or different binding point gray scales; In the case that the first display panel displays different image pictures, the display panel is respectively photographed to obtain a plurality of photographed pictures.

4. The method of claim 1, wherein, The step of determining a plurality of luminance detection points and corresponding photographed luminance values thereof from the photographed picture comprises: A plurality of luminance detection points are determined from the photographed picture according to a positioning algorithm of the luminance detection point; the luminance detection point comprises at least one luminous unit, and the luminous unit comprises at least three luminous sub-pixels with mutually different light-emitting colors.

5. The method of claim 1, wherein, After the step of determining actual luminance values corresponding to each photographed luminance value according to a luminance calibration relationship of each luminance detection point, the method further comprises: A uniformity parameter of the first display panel is determined according to maximum and minimum luminance values in a plurality of actual luminance values; A uniformity test result of the first display panel is determined according to the uniformity parameter.

6. The method of claim 1, wherein, The photographing picture is obtained by photographing the first display panel by a photographing component; The photographing component is further configured to photograph a single-color image picture displayed by the first display panel to perform brightness compensation on the first display panel, when the single-color image picture is displayed by the first display panel; the single-color image picture is an image picture when a plurality of light-emitting sub-pixels of the same light-out color emit light.

7. A luminance acquisition device of a display panel, characterized by comprising: The apparatus comprises: a photographing module configured to photograph the first display panel to obtain a photographing picture, when the first display panel displays an image picture; a positioning module configured to determine a plurality of brightness detection points and corresponding photographing brightness values from the photographing picture; a brightness module configured to determine actual brightness values corresponding to the photographing brightness values respectively according to a brightness calibration relationship of the brightness detection points; the brightness calibration relationship is a corresponding relationship between the photographing brightness values and the actual brightness values. Before the photographing of the first display panel to obtain the photographing picture, when the first display panel displays the image picture, the apparatus further comprises: driving the second display panel to display image pictures under different light-emitting brightnesses; acquiring calibration brightness values obtained by a brightness detection module by detecting brightnesses of the brightness detection points of the second display panel, when the second display panel displays the image picture under each light-emitting brightness; photographing the second display panel to obtain a calibration picture, when the second display panel displays the image picture under each light-emitting brightness; determining the brightness calibration relationship of the brightness detection points according to the photographing brightness values of the brightness detection points in the calibration picture and the calibration brightness values of the brightness detection points under different light-emitting brightnesses.

8. A luminance acquisition device of a display panel, comprising: The brightness acquisition device of the display panel comprises a processor and a memory storing computer program instructions; The processor executes the computer program instructions to implement the brightness acquisition method of the display panel according to any one of claims 1-6.

9. A computer storage medium, characterized in that The computer storage medium stores computer program instructions, and the computer program instructions are executed by the processor to implement the brightness acquisition method of the display panel according to any one of claims 1-6.

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