Display panel and display device

Abstract

The invention relates to the technical field of display, and discloses a display panel and a display device.A display area of the display panel comprises a first area, and the first area comprises first pixels; the first pixel is configured as follows: a Demura camera is adopted to shoot a display image in a first display environment, and a difference value delta 1 between a brightness value of the first pixel in the selected first area and a standard brightness value is smaller than a difference value delta 2 between a brightness value of any other pixel in the first area and the standard brightness value; the display panel comprises a preset standard gamma value, and the standard brightness value represents a brightness value calculated according to the standard gamma value in the first display environment; and during display, the Demura brightness compensation table is configured to generate the Demura brightness compensation table by taking the brightness value of the first pixel as a Demura compensation reference value, and Demura compensation is carried out. The display device comprises a driving chip, a flash memory chip and the display panel. After the display panel disclosed by the invention is compensated by adopting the Demura technology, not only is the display uniformity improved, but also the gamma test of the whole panel reaches the standard, and the display image quality is favorably improved.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more particularly to a display panel and a display device. Background Technology

[0002] OLED (Organic Light Emitting Diode), as a current-driven light-emitting device, possesses self-emissive characteristics. Compared to LCD, OLED display panels offer numerous advantages such as high contrast, ultra-thinness, and flexibility, and are increasingly being used in high-performance displays. With the continuous development of display technology, the application range of display panels is becoming increasingly wide, and people's requirements for display panels are also rising. In particular, the display quality of display panels remains one of the most important indicators for consumers and panel manufacturers to measure the quality of display panels.

[0003] Existing display devices often suffer from poor display uniformity, which affects image quality. Therefore, how to effectively improve the display uniformity of display devices to enhance image quality is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] To address the aforementioned technical problems, this disclosure provides a display panel and a display device to solve the problem of poor display uniformity and its impact on image quality in the prior art.

[0005] This disclosure provides a display panel, including: a display area and a non-display area, wherein the display area includes a first region and the first region includes a first pixel; The first pixel is configured to: capture a display image using a Demura camera in a first display environment and select a first area; the difference between the brightness value of the first pixel and the standard brightness value is Δ1, and the difference between the brightness value of any other pixel in the first area other than the first pixel and the standard brightness value is Δ2, where Δ1 < Δ2; wherein, the display panel includes a preset standard gamma value, and the standard brightness value represents the brightness value calculated based on the standard gamma value in the first display environment; When the display panel is displayed, it is configured to use the brightness value of the first pixel as the Demura compensation reference value, generate a Demura brightness compensation table, and perform Demura compensation on the entire display panel.

[0006] Based on the same inventive concept, this disclosure also provides a display device, which includes a driver chip, a flash memory chip, and the aforementioned display panel; the flash memory chip is configured to store a Demura brightness compensation table, and the driver chip is configured to read the Demura brightness compensation table from the flash memory chip and perform brightness compensation on the pixels of the display panel.

[0007] The technical solution provided in this disclosure has the following advantages compared with the prior art: The display panel disclosed herein includes a display area and a non-display area. The display area includes multiple pixels. A first region can be taken within the display area. The first region includes a first pixel. The first pixel needs to be configured such that, among the multiple pixels in the first region, through background calculation, that is, by calculating the difference between the brightness value of all pixels in the first region under the first display environment and the standard brightness value, the difference Δ1 between the brightness value of the first pixel and the standard brightness value is less than the difference Δ2 between the brightness value of any other pixel in the first region and the standard brightness value. The difference Δ1 between the brightness value of the first pixel and the standard brightness value is the smallest compared with other pixels in the first region. This first pixel serves as the reference pixel for Demura compensation. When the display panel is displayed, the brightness value of the first pixel is used as the Demura compensation reference value. After generating the Demura brightness compensation table, it is burned into the driver chip bound to the display panel. During actual display, Demura compensation is performed on the entire display panel. The display panel disclosed herein does not use the center pixel of the central area of ​​the display panel as the reference pixel for Demura compensation. Instead, it selects the first pixel within a specific first area that is closest to the standard brightness value corresponding to the current target gamma value as the Demura compensation reference pixel. This ensures that the brightness of the Demura-compensated image has no deviation or a very small deviation. Thus, while the display panel achieves Demura compensation and satisfies overall uniformity compensation, it also ensures that the test parameters of the entire panel's gamma test curve are not negatively affected. After adopting Demura compensation technology, the display panel of this disclosure not only improves display uniformity but also achieves a gamma test curve that is essentially consistent with the target gamma test curve, ensuring that the gamma test of the entire panel meets the standard and guaranteeing an improvement in the display panel's image quality. Attached Figure Description

[0008] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0009] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0010] Figure 1 This is a schematic diagram of a planar structure of a display panel provided in an embodiment of the present disclosure; Figure 2This is a schematic diagram of a target gamma test curve preset before Demura compensation for a display panel provided by existing technology; Figure 3 This is a schematic diagram of the actual gamma test curve obtained by a display panel after Demura compensation provided by existing technology; Figure 4 This is a schematic diagram of the actual gamma test curve obtained by the display panel after Demura compensation according to an embodiment of this disclosure; Figure 5 This is a schematic diagram of another planar structure of the display panel provided in an embodiment of this disclosure; Figure 6 This is a schematic diagram of another planar structure of the display panel provided in an embodiment of this disclosure; Figure 7 This is a schematic diagram of another planar structure of the display panel provided in an embodiment of this disclosure; Figure 8 This is a schematic diagram of a planar structure of a display device provided in an embodiment of this disclosure. Detailed Implementation

[0011] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0012] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0013] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a planar structure of a display panel provided in an embodiment of the present disclosure. The display panel 000 provided in this embodiment includes: a display area AA and a non-display area NA. The display area AA includes a plurality of pixels 10. The display area AA includes a first region AA1, and the first region AA1 includes a first pixel 10-1. The first pixel 10-1 is configured to: capture a display image using a Demura camera in the first display environment and select a first region AA1; the difference between the brightness value of the first pixel 10-1 and the standard brightness value L is Δ1, and the difference between the brightness value of any other pixel 10 in the first region AA1 other than the first pixel 10-1 and the standard brightness value L is Δ2, where Δ1 < Δ2; wherein, the display panel 000 includes a preset standard gamma value, and the standard brightness value L represents the brightness value calculated based on the standard gamma value in the first display environment; When display panel 000 is displayed, it is configured to use the brightness value of the first pixel 10-1 as the Demura compensation reference value, generate a Demura brightness compensation table, and perform Demura compensation on the entire display panel 000.

[0014] Currently, brightness uniformity is a major challenge facing OLED display panels. OLED display panels generally consist of pixel circuits and light-emitting elements. Pixel circuits typically consist of TFTs (Thin Film Transistors) and capacitors. Due to the non-uniformity in electrical parameters such as threshold voltage and mobility between TFTs at different locations on the display panel, this non-uniformity translates into differences in current to the light-emitting elements, leading to brightness or color differences. These differences are perceived by the human eye and are commonly known as the mura phenomenon. To improve the mura phenomenon, the industry typically employs Demura technology to compensate for brightness differences between pixels. Demura technology primarily involves using an optical camera to capture the actual brightness data of the image after the display panel is lit, calculating the compensation parameters for each pixel, and then burning these compensation parameters into the display panel.

[0015] In existing technologies, when display panels use Demura technology to compensate for uneven brightness, a high-precision camera lens is employed, with pixel-level accuracy, capable of identifying the brightness of each individual pixel. Typically, during Demura compensation, the high-precision camera uses the center pixel of the panel as a reference point, calibrating and compensating all surrounding pixels to the brightness / chromaticity range based on this reference point. However, in practice, if the brightness and chromaticity of the reference point pixel are inaccurate, the overall Demura compensation of the panel will be skewed. For example, when using Demura technology for compensation in existing technologies, suppose the reference pixel in the center of the panel has a brightness / color deviation. For instance, when the grayscale value is 32 in a low grayscale display, the standard output brightness should be 0.025 nits, but the reference pixel in the center actually only outputs 0.015 nits, which is 40% darker than the standard brightness. However, during Demura compensation, this deviation is not detected, and this inaccurate center pixel is still taken as the reference point. Then, other pixels around it that originally met the brightness standard (such as pixels that actually output 0.025 nits when the grayscale value is 32 in a low grayscale display) will be forcibly calibrated and further compensated down to the reference point's 0.015 nits. This is equivalent to pixels that originally had a grayscale value of 32 in a low grayscale display being pulled down to an even lower brightness, causing the Demura compensation of the entire panel to be skewed.

[0016] Subsequently, during gamma testing (gamma testing can be understood as verifying the non-linear correspondence between the brightness output of the OLED panel and the grayscale value of the input signal, ensuring that the transition between light and dark in the image conforms to the visual characteristics of the human eye, a key test), optical testing tools such as the VP427 optical probe are generally used on the production line to perform optical testing of the panel's gamma curve. However, the optical testing tools used for gamma testing generally have low precision, far lower than the precision of the camera lens used for Demura compensation. The optical testing tools used for gamma testing detect the overall brightness of pixels within a small area, such as detecting the average brightness of an area containing 100×100 pixels at a time, without distinguishing the differences of individual pixels. Therefore, if Demura compensation is inaccurate and skews the overall brightness of the panel, the overall brightness of a small area detected during gamma curve optical testing will deviate. This leads to a deterioration of the gamma parameter after Demura compensation, causing the preset target gamma test curve before Demura compensation (e.g., a target gamma value of 2.2) to be inconsistent with the gamma test curve after Demura compensation (e.g., inputting a grayscale signal with grayscale levels ranging from 0-255, recording the actual output brightness value of the panel, and plotting the brightness vs. grayscale relationship curve). Ultimately, this results in the final gamma curve failing the optical test and not meeting the standards. Figure 2 and Figure 3 As shown, Figure 2 This is a schematic diagram of a target gamma test curve preset before Demura compensation for a display panel provided by existing technology. Figure 3 This is a schematic diagram of the actual gamma test curve obtained by a display panel after Demura compensation, provided by existing technology. Figure 2 and Figure 3 The horizontal axis represents the gray value of the input signal (e.g., 0-255, a total of 256 levels). Figure 2 and Figure 3 The vertical axis represents the actual output brightness value of the panel, which is... Figure 2 and Figure 3 The comparison shows that although the display uniformity is improved after using Demura technology to compensate for the display panel provided by the existing technology, the actual gamma test curve ( Figure 3 ) and the preset target gamma test curve ( Figure 2 There is a deviation. Therefore, it can be seen that although the uniformity of the display is improved after using Demura technology for compensation in the existing technology, there is a tendency for the actual gamma curve to deviate from the target gamma curve. That is, the gamma test of the entire panel is prone to failure, which affects the improvement of the display panel's display quality.

[0017] To address the aforementioned problems, the display panel provided in this embodiment is designed to include a display area AA and a non-display area NA. Figure 1 The non-display area NA is set around the display area AA at least partially. The display area AA comprises multiple pixels 10. Figure 1 The example provided uses an array of multiple pixels 10 as an illustration. In actual implementation, the multiple pixels 10 can also be arranged in other ways. Within the display area AA, a first region AA1 can be taken, which includes the first pixel 10-1. The first pixel 10-1 can be used as the reference pixel for Demura compensation.

[0018] It should be noted that in this embodiment... Figure 1 In the diagram, the size and shape of the first region AA1 and pixel 10 are merely illustrative examples and do not represent the actual size. In practice, the shape of pixel 10 and the selection range of the first region AA1 can be set according to actual needs. The selection position of the first pixel 10-1 in the first region AA1 is also merely illustrative and does not represent the actual position of the first pixel 10-1 in the first region AA1.

[0019] The condition for selecting the first pixel 10-1 from the multiple pixels 10 in the first region AA1 is that the first pixel 10-1 needs to be configured such that: in the first display environment, a display image is captured using a Demura camera, and the first region AA1 is selected. The size range of the first region AA1 can include the range of multiple pixels 10, or it can be the area range based on the detection range of the optical probe used for subsequent gamma curve optical testing, or it can be other choices, as long as the first pixel 10-1 is located within the first region AA1. Optionally, the first display environment in this embodiment can be understood as the display environment under a certain grayscale display where the display panel 000 needs to perform Demura compensation, such as either a low grayscale display environment or a high grayscale display environment. This embodiment will first use a low grayscale display environment as an example for illustration. The display panel 000 includes a preset standard gamma value, which can be understood as the target gamma value when the display panel performs subsequent gamma curve optical testing, such as 2.1, 2.2, or 2.4, etc. The standard brightness value L represents the brightness value calculated based on the standard gamma value in the first display environment. Among the multiple pixels 10 in the first region AA1, through background calculation, that is, by calculating the difference between the brightness value of all pixels 10 in the first region AA1 under the first display environment and the standard brightness value L, it is possible to find a first pixel 10-1 whose brightness value differs from the standard brightness value L by Δ1. And Δ1 is less than the difference Δ2 between the brightness value of any other pixel 10 in the first region AA1 other than the first pixel 10-1 and the standard brightness value L. That is, among the multiple pixels 10 in the first region AA1, a first pixel 10-1 can be found whose difference Δ1 between the brightness value of the first pixel 10-1 and the standard brightness value L is the smallest compared with the other pixels 10 in the first region AA1. Then, the first pixel 10-1 is defined as the reference pixel. When the display panel 000 displays, the brightness value of the first pixel 10-1 is used as the Demura compensation reference value. After generating the Demura brightness compensation table, it is burned into the driver chip bound to the display panel. During actual display, Demura compensation is performed on the entire display panel 000.

[0020] It should be noted that when a display panel achieves color image display, it needs to include multiple sub-pixels of different colors. In this embodiment, a single pixel 10 can be understood as a sub-pixel, which can be a red sub-pixel, a blue sub-pixel, a green sub-pixel, or a white sub-pixel. In this embodiment, the first pixel 10-1 selected from the multiple pixels 10 in the first region AA1 can be any of the red, blue, green, or white sub-pixels. In the display panel, since each sub-pixel independently controls brightness and has different material attenuation characteristics, brightness compensation must be performed individually. Therefore, when the display panel 000 performs brightness compensation and gamma curve testing for uneven display, it only needs to test the brightness value for compensation, regardless of the sub-pixel color. Therefore, the first pixel 10-1 can be any of the red, blue, green, or white sub-pixels, as long as the first pixel 10-1 meets the above configuration conditions.

[0021] In this embodiment, the display panel 000 does not use the pixel at the center of the central area of ​​the display panel 000 as the reference pixel for Demura compensation. Instead, it selects the first pixel 10-1 within a specific first region AA1 that is closest to the standard brightness value L corresponding to the current target gamma value as the Demura compensation reference pixel. The difference Δ1 between the brightness value of the first pixel 10-1 and the standard brightness value L is less than the difference Δ2 between the brightness value of any other pixel 10 within the first region AA1 (excluding the first pixel 10-1) and the standard brightness value L. The difference Δ1 between the brightness value and the standard brightness value L is the smallest compared to the other pixels 10 in the first region AA1, ensuring that the brightness of the Demura compensation has no deviation or a small deviation. Thus, while the display panel 000 completes Demura compensation to meet overall uniformity compensation, it also ensures that the test parameters of the gamma test curve of the entire panel are not degraded or skewed. That is, after the display panel 000 in this embodiment uses Demura technology for compensation, not only is the display uniformity improved, but the gamma test curve obtained from the actual test is basically consistent with the target gamma test curve. Figure 2 and Figure 4 As shown, Figure 4 This is a schematic diagram of the actual gamma test curve obtained by the display panel after Demura compensation according to an embodiment of this disclosure, wherein... Figure 4 The horizontal axis represents the grayscale value of the input signal (e.g., 0-255, a total of 256 levels). Figure 4 The vertical axis represents the actual output brightness value of the panel, which is determined by... Figure 2 and Figure 4The comparison shows that the display panel 000 provided in this embodiment has improved display uniformity after using Demura technology for compensation, and the gamma test curve obtained in the actual test ( Figure 4 ) and the preset target gamma test curve ( Figure 2 The results are basically consistent, meaning the gamma test of the entire panel meets the standard, ensuring the improvement of the display panel's image quality.

[0022] Optionally, in this embodiment, the selection range of the first region AA1 can be the detection area range of the chromaticity and brightness measurement probe used for subsequent gamma curve optical testing. For example, the chromaticity and brightness measurement probe used for subsequent gamma curve optical testing may include a high-sensitivity probe, such as the VP427 high-sensitivity probe. Selecting the first region AA1 as the detection area range of the high-sensitivity probe used for gamma curve optical testing helps to reduce the amount of computation. When searching for the first pixel 10-1 among multiple pixels 10 in the first region AA1, by calculating the difference between the brightness value of all pixels 10 in the first region AA1 under the first display environment and the standard brightness value L, and finding a first pixel 10-1 whose brightness value differs from the standard brightness value L by Δ1, and Δ1 is less than the difference Δ2 between the brightness value of any other pixel 10 in the first region AA1 other than the first pixel 10-1 and the standard brightness value L, the amount of computation for difference calculation can be reduced, and the impact on panel testing time is small. That is, it will not cause an increase in testing time during the display panel manufacturing process, which is beneficial to improving process efficiency.

[0023] Optional, such as Figure 5 As shown, Figure 5 This is a schematic diagram of another planar structure of the display panel provided in this embodiment. In this embodiment, the area of ​​the first region AA1 is π(d / 2). 2 Where 10mm≤d≤27mm, in general production lines, the diameter of the chromaticity and brightness measurement probe used for gamma curve optical testing is generally between 10-27mm. Therefore, when the selection range of the first region AA1 adopts the detection range of the chromaticity and brightness measurement probe used for subsequent gamma curve optical testing, its area is generally π(d / 2). 2 d represents the range of diameters for the chromaticity and luminance measurement probe.

[0024] Optional, please refer to Figure 6 , Figure 6 This is a schematic diagram of another planar structure of the display panel provided in this embodiment. In this embodiment, the selection range of the first region AA1 can be the entire display area of ​​the display panel 000, that is, the first region AA1 is the display area AA, which makes the sampling range of the first region AA1 larger, and can find the first pixel 10-1 whose brightness value is closer to the standard brightness value L, with higher accuracy.

[0025] In some other alternative embodiments, when performing Dmura compensation, the display panel 000 of this embodiment can also take the average value of the brightness values ​​of all pixels 10 in the first region AA1 after selecting the first region AA1, use the obtained average value as the Dmura compensation reference value, generate a Dmura brightness compensation table, and burn it into the driver chip bound to the display panel. During actual display, Dmura compensation is performed on the entire display panel 000. The method of finding and generating the Dmura compensation reference value can also ensure that the uniformity of the display after Dmura compensation and the gamma test curve meet the standards, thereby improving the display quality.

[0026] In some alternative embodiments, please continue to refer to the references. Figures 1-6 In this embodiment, when the first display environment is a low grayscale display environment, the standard brightness value L represents the brightness corresponding to the minimum brightness value L1 and grayscale value G1 required by the display panel 000. Since it is a low grayscale display environment, L1 can be 1.8-2.2 nits and G1 can be 31-35. That is, the range of low grayscale values ​​for L1 is relatively small. This is because the brightness is relatively dark and the display is more sensitive to brightness in a low grayscale display environment. If the range of L1 is too large, it will not be conducive to the accuracy of the standard brightness value L.

[0027] When the primary display environment is a high grayscale display environment, the standard brightness value L represents the brightness required by display panel 000 when the highest required brightness is L2 and the grayscale value is G2; where L2 is 797-802 nits and G2 is 228-232 nits. That is, the range of high grayscale values ​​for L2 can be relatively large, because the brightness is inherently higher in high grayscale display environments, and even if the range of L2 values ​​is large, the impact on the accuracy of the standard brightness value L is relatively small.

[0028] Optionally, in this embodiment, the target gamma value (γ) of the display panel 000 can be between 2.1 and 2.5. Then, if the standard brightness value is L, the formula for calculating L is... Wherein, when the first display environment is a low grayscale display environment, L max The minimum brightness value L1 required for display panel 000 is 1.8-2.2 nits, and Gray is the grayscale value G1, which is 31-35; when the first display environment is a high grayscale display environment, L... max The maximum brightness value L2 required for display panel 000 is 797-802 nits, and Gray is the grayscale value G2, which is 228-232.

[0029] The following examples illustrate the search method of the first pixel 10-1 when the display panel 000 performs Dmura compensation in this embodiment.

[0030] by Figure 1 The first region AA1 shown is the area containing multiple pixels 10, with γ set to 2.1 as an example. When the first display environment is a low grayscale display environment, L1 is 1.8 nits and G1 is 31. The standard brightness value L represents the minimum brightness required by the display panel 000 when L1 and the grayscale value G1 are the corresponding brightness values. = The calculated standard brightness value L is approximately 0.02155 nits. Therefore, by calculating the difference between the brightness values ​​of all pixels 10 in the first region AA1 under the first display environment and 0.02155 nits, we can find a first pixel 10-1 whose brightness value differs from 0.02155 nits by a value of Δ1. This Δ1 is less than the difference Δ2 between the brightness value of any other pixel 10 in the first region AA1 (excluding the first pixel 10-1) and 0.02155 nits. In other words, within the first region AA1, the difference Δ1 between the brightness value of the first pixel 10-1 and 0.02155 nits is the smallest compared to the other pixels 10 in the first region AA1. This first pixel 10-1 is then defined as the reference pixel. When the display panel 000 displays, the brightness value of the first pixel 10-1 is used as the Demura compensation reference value. After generating the Demura brightness compensation table, it is burned into the driver chip bound to the display panel. During actual display, Demura compensation is performed on the entire display panel 000.

[0031] by Figure 1 The first region AA1 shown is the area containing multiple pixels 10, with γ set to 2.1 as an example. When the first display environment is a low grayscale display environment, L1 is 2 nits and G1 is 32. The standard brightness value L represents the minimum brightness required by the display panel 000 when L1 and the grayscale value G1 are the corresponding brightness values. = The calculated standard brightness value L is approximately 0.0256 nits. Therefore, by calculating the difference between the brightness values ​​of all pixels 10 in the first region AA1 under the first display environment and 0.0256 nits, we can find a first pixel 10-1 whose brightness value differs from 0.0256 nits by a value of Δ1. This Δ1 is less than the difference Δ2 between the brightness value of any other pixel 10 in the first region AA1 (excluding the first pixel 10-1) and 0.0256 nits. In other words, within the first region AA1, the difference Δ1 between the brightness value of the first pixel 10-1 and 0.0256 nits is the smallest compared to the other pixels 10 in the first region AA1. This first pixel 10-1 is then defined as the reference pixel. When the display panel 000 displays, the brightness value of the first pixel 10-1 is used as the Demura compensation reference value. After generating the Demura brightness compensation table, it is burned into the driver chip bound to the display panel. During actual display, Demura compensation is performed on the entire display panel 000.

[0032] by Figure 6 The first area AA1 shown is selected within the entire display area AA, with γ set to 2.1 as an example. When the first display environment is a low grayscale display environment, L1 is set to 2.2 nits and G1 to 34. The standard brightness value L represents the minimum brightness required by the display panel 000 when L1 and the grayscale value G1 are the corresponding brightness values. = The calculated standard brightness value L is approximately 0.03197 nits. Therefore, by calculating the difference between the brightness values ​​of all pixels 10 in the first region AA1 under the first display environment and 0.03197 nits, we can find a first pixel 10-1 whose brightness value differs from 0.03197 nits by a value of Δ1. This Δ1 is less than the difference Δ2 between the brightness value of any other pixel 10 in the first region AA1 (excluding the first pixel 10-1) and 0.03197 nits. In other words, within the first region AA1, the difference Δ1 between the brightness value of the first pixel 10-1 and 0.03197 nits is the smallest compared to the other pixels 10 in the first region AA1. This first pixel 10-1 is then defined as the reference pixel. When the display panel 000 displays, the brightness value of the first pixel 10-1 is used as the Demura compensation reference value. After generating the Demura brightness compensation table, it is burned into the driver chip bound to the display panel. During actual display, Demura compensation is performed on the entire display panel 000.

[0033] by Figure 1The first region AA1 shown is the area containing multiple pixels 10, with γ set to 2.1 as an example. When the first display environment is a high grayscale display environment, L2 is 800 nits and G2 is 230. The standard brightness value L represents the maximum brightness required by the display panel 000 when the grayscale value is L2 and the grayscale value is G2. = The calculated standard brightness value L is approximately 644.146 nits. Therefore, by calculating the difference between the brightness values ​​of all pixels 10 in the first region AA1 under the first display environment and 644.146 nits, we can find a first pixel 10-1 whose brightness value differs from 644.146 nits by a value of Δ1. This Δ1 is less than the difference Δ2 between the brightness value of any other pixel 10 in the first region AA1 (excluding the first pixel 10-1) and 644.146 nits. In other words, within the first region AA1, the difference Δ1 between the brightness value of the first pixel 10-1 and 644.146 nits is the smallest compared to the other pixels 10 in the first region AA1. This first pixel 10-1 is then defined as the reference pixel. When the display panel 000 displays, the brightness value of the first pixel 10-1 is used as the Demura compensation reference value. After generating the Demura brightness compensation table, it is burned into the driver chip bound to the display panel. During actual display, Demura compensation is performed on the entire display panel 000.

[0034] Optionally, the display panel 000 provided in this embodiment is configured to use the brightness value of the first pixel 10-1 as the Demura compensation reference value to generate a Demura brightness compensation table and perform Demura compensation on the entire display panel 000. The specific process of implementing compensation generally includes: using the brightness value of the first pixel 10-1 as the Demura compensation reference value, generating a Demura brightness compensation table through a Demura compensation algorithm; and displaying the image based on the Demura brightness compensation table when the display panel 000 actually displays the image.

[0035] Specifically, after selecting the brightness value of the first pixel 10-1 as the Demura compensation reference value, all pixels 10 of the display panel 000 can be lit up according to the Demura compensation reference value. Then, a Demura camera is used to capture the current actual brightness value of all pixels 10 and generate an actual brightness table corresponding to each pixel. Based on the actual brightness value of each pixel in the actual brightness table, the difference between the actual brightness value and the Demura compensation reference value is calculated to generate a Demura brightness compensation table. Finally, the generated Demura brightness compensation table is burned into the driver chip subsequently bound to the display panel 000 for retrieval and Demura compensation is performed on the entire display panel 000 during actual display.

[0036] For example, when the first display environment is a low grayscale display environment, the standard brightness value L is 0.0256 nit. Using the method described above, the first pixel 10-1, which has the smallest difference from 0.0256 nit (i.e., is closest to 0.0256 nit), is selected as the reference pixel. Then, when performing Demura calibration compensation in a low grayscale display environment, a target grayscale signal of 32 (standard brightness of 0.0256 nit) is first input to the display panel, and then the panel is turned on. A Demura camera is used to capture the brightness distribution map of all pixels 10 on the display panel. For example, in the brightness distribution map, pixel A: 0.023 nit, pixel B: 0.028 nit, pixel C: 0.027 nit, etc. Using this brightness distribution map, the brightness deviation of each pixel 10 from the reference pixel, i.e., the first pixel 10-1, can be calculated to determine whether the correction direction is to darken or brighten. For example, if pixel A: 0.023 nit is too dark, then compensation is to brighten it; if pixel B: 0.028 nit is too bright, then compensation is to darken it. After calculating the compensation values ​​for all pixels... This allows us to obtain a compensation table corresponding to each pixel 10, which is the compensation rule for each pixel 10. This generates a Demura brightness compensation table, which is stored in the driver chip subsequently bound to the display panel 000 for later retrieval. The driver chip records these compensation values ​​and binds them to the target grayscale signal of 32 (this compensation table is only loaded when the grayscale value is 32; other grayscale values ​​have separate compensation tables). After storage, the display panel is restarted and lit up with the target grayscale signal of 32. At this time, the display panel 000 will automatically read this Demura brightness compensation table to adjust the driving signal of each pixel 10 to emit light. At this time, the brightness values ​​of all pixels 10 of the lit display panel 000 are basically close to 0.0256 nit, that is, the display uniformity meets the standard. Furthermore, since Demura compensation uses the first pixel 10-1, which is closest to 0.0256 nit, as the reference pixel, it can ensure that the gamma test curve obtained in the actual test is basically consistent with the preset target gamma test curve when conducting subsequent gamma curve tests. In other words, the gamma test of the entire panel meets the standard, which can improve the display quality of the display panel.

[0037] Optional, such as Figure 1As shown, in this embodiment, the first pixel 10-1 selected in the first area AA1 is not the center pixel 10-X of the display panel 000. Here, the center pixel 10-X can be understood as the pixel at the very center of the display area AA of the display panel 000. That is, in this embodiment, the first pixel 10-1 is not selected based on the position of pixel 10, but rather by selecting the first pixel 10-1 based on the standard brightness value that is closest to the standard brightness value. This ensures that the Demura compensation of the display panel 000 will not be skewed by the brightness value of the selected center pixel, thus affecting the gamma test.

[0038] It is understandable that if the display area AA of display panel 000 is square, then the center pixel 10-X of display panel 000 (e.g., ...) Figure 1 (As shown) can be understood as the pixels near the intersection of the diagonals of display panel 000.

[0039] Optional, such as Figure 7 As shown, Figure 7 This is a schematic diagram of another planar structure of the display panel provided in this embodiment. In this embodiment, a plurality of pixels 10 of the display panel 000 are arranged along the first direction X to form a pixel row 10H, and the plurality of pixel rows 10H are arranged along the second direction Y; the plurality of pixels 10 are arranged along the second direction Y to form a pixel column 10L, and the plurality of pixel columns 10L are arranged along the first direction X. In the direction parallel to the plane where the display panel 000 is located, the first direction X and the second direction Y are perpendicular to each other. The first pixel 10-1 is not within the central area AAZ of the display panel 000; wherein, the display panel includes m pixel rows 10H and n pixel columns 10L, where m and n are both positive integers, and the central area AAZ represents the first pixel. m a The pixel row to the first m a Between the rows of pixels, the first n a The pixel column to the first n a The region containing all pixels between each pixel column m a =TRUNC( m, 0); m a =TRUNC( m, 0); n a =TRUNC( n, 0); n a =TRUNC( n, 0).

[0040] This embodiment explains that the first pixel 10-1 selected in the first region AA1 is not within the middle region AAZ of the display panel 000. Here, the middle region AAZ can be understood as the area containing the middle multiple pixel rows and columns of the display panel 000. Specifically, assuming the display panel includes m pixel rows 10H and n pixel columns 10L, where m and n are both positive integers, then the middle region AAZ represents the... m a The pixel row to the first m a Between the rows of pixels, the first n a The pixel column to the first n a The region containing all pixels between each pixel column m a =TRUNC( m, 0); m a =TRUNC( m, 0); n a =TRUNC( n, 0); n a =TRUNC( (n, 0). TRUNC is the floor function, which means that if n, 0). m、 If n is not an integer, then m a Pick The integer part of m, n a Pick The integer part of n m a Pick The integer part of m, n a Pick The integer part of n.

[0041] For example, if m is 500 and n is 1000, meaning the display panel has 500 pixel rows and 1000 pixel columns, then in this embodiment, the first pixel 10-1 in the first region AA1, which is the pixel whose brightness value is closest to the standard brightness value, is not located in the region where all pixels between the 200th and 300th pixel rows and the 400th and 600th pixel columns are located.

[0042] For example, if m is 768 and n is 1024, meaning the display panel has 768 pixel rows and 1024 pixel columns, then in this embodiment, the first pixel 10-1 in the first region AA1, i.e., the pixel whose brightness value is closest to the standard brightness value, is not in the 307th position. m=307.2, m a =307) pixels to the 460th ( m=460.8, m a =460) pixels row, 409th ( n=409.6, n a =409) pixels to the 614th ( n=614.4, n a The region containing all pixels between 614 pixel columns.

[0043] It should be noted that this embodiment is only an example to illustrate that the first pixel 10-1 selected in the first area AA1 is not the center pixel 10-X of the display panel 000 or a pixel in the middle area AAZ, so that the Demura compensation of the entire panel will not be biased due to the deviation of the brightness value of the selected reference pixel when the display panel performs Demura compensation, thereby affecting the gamma test. In specific implementation, the first pixel 10-1 can be selected according to the measured brightness.

[0044] In some alternative embodiments, please refer to Figure 8 , Figure 8 This is a schematic diagram of a planar structure of a display device provided in an embodiment of the present disclosure. The display device 111 provided in this embodiment includes the display panel 000 provided in the above embodiments of the present disclosure. Figure 8 This embodiment uses a mobile phone as an example to illustrate the display device 111. It is understood that the display device 111 provided in this embodiment can be other display devices 111 with display functions, such as computers, televisions, and vehicle display devices. This embodiment does not impose any specific limitations on this.

[0045] Optionally, the display device 111 provided in this embodiment further includes a driver chip 10 and a flash memory chip 20. The driver chip 10 and the flash memory chip 20 can both be bonded to a flexible circuit board. Finally, the flexible circuit board can be bent to the backlight surface of the display panel 000 (for clear illustration of the driver chip 10 and the flash memory chip 20). Figure 8(The image shows the state before bending). In this embodiment, the flash memory chip 20 is configured to store the Demura brightness compensation table generated in the above embodiments, and the driver chip 10 is configured to read the Demura brightness compensation table from the flash memory chip 20 and perform brightness compensation on the pixels of the display panel 000. The display device 111 provided in this embodiment has the beneficial effects of the display panel 000 provided in the above embodiments of this disclosure. For details, please refer to the specific descriptions of the display panel 000 in the above embodiments, which will not be repeated here.

[0046] 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 one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A display panel, characterized by, The display panel comprises: a display area and a non-display area, the display area comprising a first region, the first region comprising a first pixel; the first pixel is configured to: take a display image by using a Demura camera in a first display environment, and select the first region; a difference between a luminance value of the first pixel and a standard luminance value is Δ1, and a difference between a luminance value of any pixel in the first region other than the first pixel and the standard luminance value is Δ2, Δ1<Δ2; wherein the display panel comprises a preset standard gamma value, and the standard luminance value represents a luminance value calculated according to the standard gamma value in the first display environment; the display panel is configured to generate a Demura luminance compensation table by taking the luminance value of the first pixel as a Demura compensation reference value when displaying, and perform Demura compensation on the entire display panel.

2. The display panel of claim 1, wherein, The selection range of the first region is the detection area range of a chroma brightness measurement probe.

3. The display panel of claim 2, wherein, The chroma brightness measurement probe comprises a high-sensitivity probe.

4. The display panel of claim 1, wherein, The area of the first region is π(d / 2) 2 ; wherein 10 mm ≤ d ≤ 27 mm.

5. The display panel of claim 1, wherein, The first region is the display area of the entire display panel.

6. The display panel of claim 1, wherein, The first display environment comprises any one of a low gray scale display environment or a high gray scale display environment.

7. The display panel of claim 6, wherein, when the first display environment is a low gray scale display environment, the standard luminance value represents a luminance corresponding to a required minimum luminance value L1 and a gray scale value G1 of the display panel; wherein L1 is 1.8-2.2 nit, and G1 is 31-35; when the first display environment is a high gray scale display environment, the standard luminance value represents a luminance corresponding to a required maximum luminance value L2 and a gray scale value G2 of the display panel; wherein L2 is 797-802 nit, and G2 is 228-232.

8. The display panel of claim 6, wherein, The standard luminance value is L; wherein, , gamma is 2.1-2.5; L when the first display environment is a low gray scale display environment max the minimum luminance value required for the display panel 1.8-2.2 nit, and Gray is a gray scale value 31-35; L max The maximum luminance value required for the display panel 797-802 nit, and Gray is the gray scale value 228-232.

9. The display panel of claim 1, wherein, the display panel is configured to generate a Demura luminance compensation table by taking the luminance value of the first pixel as a Demura compensation reference value when displaying, and perform Demura compensation on the entire display panel, comprising: generating a Demura luminance compensation table by Demura compensation algorithm by taking the luminance value of the first pixel as a Demura compensation reference value; displaying a picture based on the Demura luminance compensation table when the display panel actually displays.

10. The display panel of claim 9, wherein, generating a Demura luminance compensation table by Demura compensation algorithm by taking the luminance value of the first pixel as a Demura compensation reference value, comprising: lighting all pixels of the display panel with the Demura compensation reference value; taking a current actual luminance value of all pixels by using a Demura camera, and generating an actual luminance table corresponding to the pixels; calculating a difference between the actual luminance value of each pixel in the actual luminance table and the Demura compensation reference value, and generating the Demura luminance compensation table.

11. The display panel of claim 1, wherein, The first pixel is not a center pixel of the display panel.

12. The display panel of claim 1, wherein, A plurality of the pixels are arranged along a first direction to form a pixel row, and a plurality of the pixel rows are arranged along a second direction; a plurality of the pixels are arranged along the second direction to form a pixel column, and a plurality of the pixel columns are arranged along the first direction; in a direction parallel to a plane on which the display panel is located, the first direction and the second direction intersect; The first pixel is not located within the central area of ​​the display panel; wherein the display panel comprises m pixel rows and n pixel columns, where m and n are both positive integers, and the central area represents the first pixel. m a The pixel row to the first m a Between the rows of pixels, the first n a The pixel column to the first n a The region containing all pixels between each pixel column m a =TRUNC( m, 0); m a =TRUNC( m, 0); n a =TRUNC( n, 0); n a =TRUNC( n, 0).

13. A display device comprising: The display panel of any one of claims 1-12, further comprising a driving chip, a flash memory chip, and a Demura brightness compensation table; the flash memory chip is configured to store the Demura brightness compensation table, and the driving chip is configured to read the Demura brightness compensation table from the flash memory chip and perform brightness compensation on the pixels of the display panel.

Images