Brightness file generation method and device of display panel and compensation method

Abstract

The invention discloses a brightness file generation method and device of a display panel and a compensation method. A driving chip is arranged at the position of a lower frame of the display panel; the direction from the end away from the driving chip to the end close to the driving chip is the length direction of the display panel, and the ratio of the length to the width of the display panel is larger than 3; the brightness file generation method comprises the steps that pixels in all rows in all display areas of a display panel are lightened with different preset gray-scale values, at least two display areas are distributed in the length direction of the display panel, and the preset gray-scale values adopted for lightening the different display areas are different; shooting a display picture of the display panel, and obtaining actual brightness data of each pixel under a preset gray-scale value; and generating a brightness file according to the preset gray-scale value and the actual brightness data of each pixel. According to the technical scheme provided by the embodiment of the invention, when the camera shoots a relatively long display panel under the same exposure parameter, the accuracy of shooting data is improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a brightness file generation method, device and compensation method for a display panel. Background Art

[0002] In the process of testing the prepared display screen, when the camera captures the data of the display screen, the exposure time of the camera is related to the brightness of the display screen. Therefore, a reasonable exposure time needs to be set to ensure the accuracy of the data of the display screen.

[0003] However, with the development of display technology, longer display screens have emerged in response to market demand. The display brightness varies greatly at different positions on a longer display screen. Therefore, when a camera shoots the display screen with the same exposure parameters, the shooting data at different positions will have large errors. Summary of the invention

[0004] The present invention provides a method, device and compensation method for generating a brightness file of a display panel, so as to improve the accuracy of shooting data when a camera shoots a display panel with a long length under the same exposure parameters.

[0005] According to one aspect of the present invention, a method for generating a brightness file of a display panel is provided, wherein a driver chip is disposed at a lower frame position of the display panel; a direction from an end away from the driver chip to an end close to the driver chip is a length direction of the display panel, and a ratio of the length to the width of the display panel is greater than 3;

[0006] The method for generating a brightness file of a display panel comprises:

[0007] Lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values, wherein at least two display areas are distributed along the length direction of the display panel, and the preset grayscale values ​​used to light up different display areas are different;

[0008] Shooting a display screen of the display panel to obtain actual brightness data of each pixel at the preset grayscale value;

[0009] A brightness file is generated according to the preset grayscale value of each pixel and the actual brightness data.

[0010] Optionally, the display panel includes a long strip display screen, the long strip display screen includes a first sub-display screen and a second sub-display screen; the first sub-display screen and the second sub-display screen are arranged along the length direction of the display panel, and the first sub-display screen and the second sub-display screen are an integrated structure; the display screen includes an extended screen or a folding screen;

[0011] The driving chip is arranged at the lower frame of the long strip display screen.

[0012] Optionally, along the length direction of the display panel, the display panel includes at least three display areas; wherein the at least three display areas include a central area located at the length center of the display panel;

[0013] The step of lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​comprises:

[0014] Lighting up each row of pixels in each display area with different preset grayscale values ​​having a single change trend from one end away from the driver chip to one end close to the driver chip;

[0015] Preferably, the display area includes at least one row of pixels.

[0016] Optionally, along a direction from an end of the display panel away from the driving chip to an end close to the driving chip, the preset grayscale values ​​corresponding to the pixels in each of the display areas change in a decreasing trend.

[0017] Optionally, the display panel includes at least three display areas, and the at least three display areas include: a first display area located at an end away from the driving chip, a second display area located at an end close to the driving chip, and a third display area located between the first display area and the second display area; the preset grayscale value includes a first grayscale value, a second grayscale value and a third grayscale value;

[0018] The lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​includes:

[0019] Lighting up each row of the pixels in the first display area with the first grayscale value;

[0020] Lighting up each row of the pixels in the second display area with the second grayscale value;

[0021] Lighting up each row of the pixels in the third display area with the third grayscale value;

[0022] Preferably, the third grayscale value is a target grayscale value, the first grayscale value is a sum of the target grayscale value and a grayscale compensation value, and the second grayscale value is a difference between the target grayscale value and the grayscale compensation value.

[0023] Optionally, generating a brightness file according to the preset grayscale value of each pixel and the actual brightness data includes:

[0024] Performing brightness-grayscale curve fitting according to the preset grayscale value of the pixel and the actual brightness data;

[0025] Inputting the preset grayscale value of the pixel and the corresponding actual brightness data into the brightness-grayscale curve to calculate the brightness data of the pixel at the target grayscale value;

[0026] The brightness file corresponding to the target grayscale value is generated according to the brightness data of each pixel in the display panel at the target grayscale value.

[0027] Optionally, performing brightness-grayscale curve fitting according to the preset grayscale value of the pixel and the actual brightness data includes:

[0028] Obtaining the brightness value of each row of pixels in the central area of ​​the display panel at the highest grayscale value as a brightness reference value; wherein the central area is an area located at the length center of the display panel;

[0029] A gamma index is calculated according to the highest grayscale value and the brightness reference value, as well as the preset grayscale value of the pixel and the corresponding actual brightness data to obtain the brightness-grayscale curve of the pixel.

[0030] Optionally, performing brightness-grayscale curve fitting according to the preset grayscale value of the pixel and the actual brightness data includes:

[0031] Acquire the actual brightness data of the pixel at at least two different preset grayscale values;

[0032] A gamma index is calculated according to at least two sets of the preset grayscale values ​​of the pixel and the corresponding actual brightness data to obtain the brightness-grayscale curve of the pixel.

[0033] According to another aspect of the present invention, there is provided a device for generating a brightness file of a display panel, comprising:

[0034] A pixel lighting module, used to light up each row of pixels in each display area of ​​the display panel with different preset grayscale values, wherein at least two display areas are distributed along the length direction of the display panel, and the preset grayscale values ​​used to light up different display areas are different;

[0035] A data acquisition module, used for photographing the display screen of the display panel and acquiring actual brightness data of each pixel at the preset grayscale value;

[0036] The brightness file generating module is used to generate a brightness file according to the preset grayscale value of each pixel and the actual brightness data.

[0037] According to another aspect of the present invention, a compensation method for a display panel is provided, which uses a brightness file of the display panel generated by the brightness file generation method of the display panel described in any embodiment of the first aspect to compensate a display image of the display panel.

[0038] The brightness file generation method of the display panel provided by the embodiment of the present invention can illuminate each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​along the length direction of the display panel for a display panel whose length-to-width ratio is greater than 3 and whose driver chip is arranged at the lower frame position, so that the brightness difference between the display areas is less than the set difference threshold, which is conducive to improving the accuracy of the display screen data collected by the camera, thereby improving the data accuracy of the generated brightness file. The brightness file obtained by the brightness file generation method of the display panel provided by the embodiment of the present invention compensates for the brightness of each pixel when the display panel is illuminated at the same grayscale, improves the situation where the brightness difference of the display screen at different positions on the display panel is too large, and is conducive to improving the accuracy of the display screen data captured by the camera with the same exposure parameters.

[0039] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 is a schematic structural diagram of a display panel provided according to an embodiment of the present invention;

[0042] Figure 2 is a flow chart of a method for generating a brightness file of a display panel provided in accordance with an embodiment of the present invention;

[0043] Figure 3 is a schematic structural diagram of another display panel provided according to an embodiment of the present invention;

[0044] Figure 4 is a specific flow chart of step S130 in a method for generating a brightness file of a display panel provided in an embodiment of the present invention;

[0045] Figure 5is a specific flow chart of step S131 in a method for generating a brightness file of a display panel provided in an embodiment of the present invention;

[0046] Figure 6 is a schematic diagram of a specific flow of step S131 in another method for generating a brightness file of a display panel provided by an embodiment of the present invention;

[0047] Figure 7 is a flow chart of another method for generating a brightness file of a display panel provided according to an embodiment of the present invention;

[0048] Figure 8 It is a structural schematic diagram of a brightness file generating device for a display panel provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0050] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0051] An embodiment of the present invention provides a method for generating a brightness file of a display panel. Figure 1 is a schematic diagram of the structure of a display panel provided by an embodiment of the present invention. Figure 1As shown, a driver chip 01 is disposed at the lower frame of the display panel 00; the direction from the end away from the driver chip 01 to the end close to the driver chip 01 is taken as the length direction of the display panel 00, and the ratio of the length to the width of the display panel 00 is greater than 3. Among them, the ratio of the length to the width of a traditional mobile phone display panel is generally 3, and illustratively, the ratio of the length to the width of the display panel 00 applicable to the embodiment of the present invention can be in the range of [4, 6], which is not limited here. See Figure 1 , the length direction of the display panel can be represented by the Y direction. Since the length of the display panel is relatively long, the voltage drop difference between the side far from the driver chip 01 and the side close to the driver chip 01 is relatively large, resulting in a large difference in display brightness between the side far from the driver chip 01 and the side close to the driver chip 01 on the display panel. The brightness file generation method of the display panel provided in the embodiment of the present invention is applicable to the case where the driver chip 01 is arranged at one end of the display panel 00 along the Y direction in which the ratio of the length to the width is greater than 3. When the display panel is photographed with a camera using the same exposure parameters, the display brightness difference between the position close to the driver chip 01 and the position far from the driver chip 01 is relatively large, resulting in a large error in the data captured by the camera.

[0052] Figure 2 The present invention provides a flow chart of a method for generating a brightness file of a display panel, which can be executed by a device for generating a brightness file of a display panel. The device for generating a brightness file of a display panel can be implemented in the form of hardware and / or software. The device for generating a brightness file of a display panel can be configured in a display panel or a compensation device, which is not limited here. Figure 2 As shown, the method for generating a brightness file of the display panel specifically includes the following steps:

[0053] S110, lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values, wherein at least two display areas are distributed along the length direction of the display panel, and different preset grayscale values ​​are used to light up different display areas.

[0054] For example, the display panel can be divided into at least two display areas along the length direction of the display panel, which is conducive to finely setting the display brightness of each display area. Figure 1 The display panel 00 is divided into two display areas 02 along the Y direction of the display panel 00 , wherein one display area 02 is located at an end close to the driving chip 01 , and the other display area 02 is located at an end far from the driving chip 01 .

[0055] In view of the influence of voltage drop on display brightness, for the different divided display areas, each row of pixels in the corresponding display area is lit with different preset grayscale values, that is, a smaller preset grayscale value can be sent to display area A, and a larger preset grayscale value can be sent to display area B to adjust the display brightness of different display areas. By lighting up different display areas with different preset grayscale values, the display brightness difference at different positions on the entire display panel can be reduced, so that the brightness difference between each display area on the display panel is less than the set difference threshold, that is, the brightness between each display area tends to be consistent, so as to ensure the accuracy of the display brightness data captured by the camera. Among them, different preset grayscale values ​​and the set difference threshold of display brightness between each display area can be set by the user according to actual needs, and are not limited here.

[0056] S120 , photographing a display screen of the display panel to obtain actual brightness data of each pixel at a preset grayscale value.

[0057] For example, the actual brightness data is the brightness data of the pixel captured by the camera at the corresponding preset grayscale value. Figure 1 , the display panel can be divided into two display areas, namely display area A and display area B, wherein display area A is the end close to the driver chip, and display area B is the end away from the driver chip. Now it is desired to shoot the display screen of the display panel at 240 grayscales. Since the display panel is long, the display area A can be lit with a preset grayscale value of 200 grayscales, and the display area B can be lit with a preset grayscale value of 280 grayscales, so that the display brightness difference between display area A and display area B is small. The actual brightness data of display area A obtained by using a camera to display the screen of the display panel lit with the above corresponding preset grayscale values ​​is the brightness data of each pixel in display area A at 200 grayscales, and the actual brightness data of display area B is the brightness data of each pixel in display area B at 280 grayscales.

[0058] S130 , generating a brightness file according to the preset grayscale value and actual brightness data of each pixel.

[0059] By compensating the brightness of each pixel in the display panel with the brightness file, it is possible to prevent the brightness difference at different positions on the display screen from being too large, which is beneficial to improving the accuracy of the data obtained by the camera when shooting with the same exposure parameters.

[0060] The brightness file generation method of the display panel provided by the embodiment of the present invention can illuminate each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​along the length direction of the display panel for a display panel whose length-to-width ratio is greater than 3 and whose driver chip is arranged at the lower frame position, so that the brightness difference between the display areas is less than the set difference threshold, which is conducive to improving the accuracy of the display screen data collected by the camera, thereby improving the data accuracy of the generated brightness file. The brightness file obtained by the brightness file generation method of the display panel provided by the embodiment of the present invention compensates for the brightness of each pixel when the display panel is illuminated at the same grayscale, improves the situation where the brightness difference of the display screen at different positions on the display panel is too large, and is conducive to improving the accuracy of the display screen data captured by the camera with the same exposure parameters.

[0061] Based on the above embodiments, optionally, the display panel includes a long strip display screen, the long strip display screen includes a first sub-display screen and a second sub-display screen; the first sub-display screen and the second sub-display screen are arranged along the length direction of the display panel, and the first sub-display screen and the second sub-display screen are an integrated structure; the display screen includes an extended screen or a folding screen; and a driving chip is arranged at the lower frame position of the long strip display screen.

[0062] Exemplarily, the display panel to which the brightness file generation method for a display panel provided in an embodiment of the present invention is applicable may include a long strip display screen. The long strip display screen may include a first sub-display screen and a second sub-display screen, and the first sub-display screen and the second sub-display screen may be located on the same horizontal plane or on two different horizontal planes. In other words, the long strip display screen may be an integrated extended screen for a plane with a longer length; or it may be an integrated folding screen for a complete piece; wherein, the edge of the display screen may also have missing corners, etc., which are not limited here. Using such a long strip display screen instead of two independent flat screens, i.e., the main and sub-screens, used in the related art to realize the function of a foldable display device can effectively reduce the preparation cost of the display device.

[0063] The driver chip is set at the lower frame of the long strip display screen, and the voltage drop changes greatly, which makes the display brightness of pixels at different positions on the long strip display screen too different. The brightness file is generated by the brightness file generation method of the display panel provided by the embodiment of the present invention, and the pixels are compensated according to the brightness file, which can effectively improve the situation where the display brightness of pixels in different areas is too different when the display panel is lit with the same grayscale value, thereby improving the accuracy of the display picture data collected by the camera.

[0064] On the basis of the above embodiments, optionally, along the length direction of the display panel, the display panel includes at least three display areas; wherein the at least three display areas include a central area located at the length center of the display panel.

[0065] Exemplarily, the display panel may include at least three display areas along the length direction, and different display areas are illuminated with different preset grayscale values, so that the display brightness of each display area of ​​the display panel with a longer length can be finely adjusted, so that the brightness difference between the display areas can be effectively reduced. Figure 3 FIG. 1 is a schematic diagram of the structure of another display panel provided by an embodiment of the present invention. Figure 3 , the length direction of the display panel 000 can still be represented by the Y direction. The driving chip 001 is arranged at the lower frame position of the display panel. Along the Y direction of the display panel 000, Figure 3 The diagram shows a situation where the display panel 000 is divided into at least three display areas 002, which respectively include a display area a located at one end close to the driver chip 001, a display area b located at one end far from the driver chip 001, and a display area c located at the length center of the display panel 000, i.e., the central area.

[0066] On the basis of the above embodiment, when the display panel includes at least three display areas along the length direction, lighting each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​in step S120 may include the following steps:

[0067] From an end away from the driving chip to an end close to the driving chip, each row of pixels in each display area is lit with different preset grayscale values ​​having a single change trend.

[0068] Exemplarily, when setting the preset grayscale value of each display area in the display panel, the preset grayscale value of each display area can be set to different values ​​that change with a single change trend along the direction from the end away from the driver chip to the end close to the driver chip, that is, along the end away from the driver chip to the end close to the driver chip, the corresponding preset grayscale value of each display area changes with a gradual trend. Among them, the change of the preset grayscale value with a single change trend may include the change of the preset grayscale value with a gradually increasing trend, or may also include the change of the preset grayscale value with a gradually decreasing trend; and the difference between the preset grayscale values ​​of two adjacent display areas is not limited here. Exemplarily, along the end away from the driver chip to the end close to the driver chip, the preset grayscale value of each pixel row in each display area can be set to gradually decrease, so that the voltage drop generated by the circuit at the end close to the driver chip is smaller, and the voltage drop generated at the end away from the driver chip is larger, so that the brightness difference between each display area is reduced.

[0069] Based on the above embodiments, optionally, the display area includes at least one row of pixels.

[0070] Exemplarily, the display panel is divided into multiple display areas along the length direction of the display panel. The number of rows of pixels contained in each display area is not limited herein, and may contain only one row of pixels, or two rows of pixels, or multiple rows of pixels. It can be set by the user according to actual needs to reduce the brightness difference between the display areas in the entire display panel and ensure the accuracy of the display picture data captured by the camera.

[0071] Based on the above embodiments, optionally, a method for setting a preset grayscale value of a pixel in each display area includes the following steps:

[0072] Along the direction from the end of the display panel away from the driving chip to the end close to the driving chip, the preset grayscale values ​​corresponding to the pixels in each display area change in a decreasing trend.

[0073] For example, the preset grayscale values ​​corresponding to the pixels in each display area can be set in a decreasing trend from the end of the display panel far from the driver chip to the end close to the driver chip, that is, the preset grayscale value of the display area far from the driver chip is larger, while the preset grayscale value of the display area close to the driver chip is smaller. Figure 3 , that is, the preset grayscale value of the b display area is set to a larger value, and the preset grayscale values ​​of the c display area and the a display area are set to decrease in sequence. In this way, a larger preset grayscale value can be used to compensate for the lower brightness of the display area far from the driver chip due to the larger voltage drop; a smaller preset grayscale value can be used to compensate for the higher brightness of the display area close to the driver chip due to the smaller voltage drop, thereby reducing the brightness difference between the display areas in the entire display panel.

[0074] Based on the above embodiments, optionally, the display panel includes at least three display areas, and the at least three display areas include: a first display area located at an end away from the driver chip, a second display area located at an end close to the driver chip, and a third display area located between the first display area and the second display area; the preset grayscale value includes a first grayscale value, a second grayscale value, and a third grayscale value. For example, continue to refer to Figure 3 , the first display area may be the b display area, the second display area may be the a display area, and the third display area may be the c display area.

[0075] The step S110 of lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​specifically includes the following steps:

[0076] Each row of pixels in the first display area is lit with a first grayscale value.

[0077] Exemplarily, each row of pixels in the display area away from one end of the driving chip is lit with a first grayscale value. Figure 3 , that is, lighting up the b display area with the first grayscale value.

[0078] Each row of pixels in the second display area is lit with a second grayscale value.

[0079] Exemplarily, each row of pixels in the display area close to one end of the driving chip is lit with the second grayscale value. Figure 3 , that is, lighting up the a display area with the second grayscale value.

[0080] Each row of pixels in the third display area is lit up with a third grayscale value; wherein the first grayscale value is greater than the third grayscale value, and the second grayscale value is less than the third grayscale value.

[0081] Exemplarily, each row of pixels in the third display area located at the center of the display panel is lit with a third grayscale value. Figure 3 , that is, the c display area is lit with the third grayscale value. And the first grayscale value is set to be greater than the third grayscale value, and the second grayscale value is set to be less than the third grayscale value, that is, the first grayscale value of the b display area is greater than the third grayscale value of the c display area, and the second grayscale value of the a display area is less than the third grayscale value of the c display area. By setting the preset grayscale values ​​of each display area in this way, the display brightness of the pixels in each display area of ​​the entire display panel can be close to the display brightness of the pixels in the central area, thereby improving the situation where the display brightness difference between different areas of the display panel is too large.

[0082] Based on the above embodiments, optionally, the third grayscale value is set to the target grayscale value, the first grayscale value is set to the sum of the target grayscale value and the grayscale compensation value, and the second grayscale value is set to the difference between the target grayscale value and the grayscale compensation value.

[0083] Exemplarily, the target grayscale value is the grayscale value used when the display panel is lit with the same grayscale value. For example: if you want to capture the data of the display screen of the display panel at 240 grayscale, the target grayscale value is 240 grayscale. The third grayscale value of the third display area in the center of the length direction of the display panel can be set as the target grayscale value, the first grayscale value of the first display area at the end away from the driver chip can be set as the sum of the target grayscale value and the grayscale compensation value, and the second grayscale value of the second display area at the end close to the driver chip can be set as the difference between the target grayscale value and the grayscale compensation value. For example: See Figure 3, the third grayscale value of the c display area can be set to grayscale 240, the first grayscale value of the b display area can be set to grayscale 280, and the second grayscale value of the a display area can be set to grayscale 200. In this way, the grayscale value difference between the b display area and the c display area is equal to the grayscale value difference between the a display area and the c display area, and the display brightness of the b display area and the a display area can be compensated to be close to the display brightness of the c display area, so that the entire display panel does not have a large display brightness difference.

[0084] The brightness file generation method of the display panel provided in the above-mentioned embodiments sets different preset grayscale values ​​for different display areas of the display panel, and sets the preset grayscale value of each display area to change in a decreasing trend along the direction from one end of the display panel away from the driver chip to the end close to the driver chip. The difference in the preset grayscale values ​​between two adjacent display areas is the same, which is beneficial to reducing the brightness difference between the display areas on the display panel to ensure the accuracy of the display picture data captured by the camera.

[0085] Based on the above embodiments, Figure 4 FIG. 1 is a schematic diagram of a specific flow chart of step S130 in a method for generating a brightness file of a display panel provided by an embodiment of the present invention. Figure 4 As shown, optionally, generating a brightness file according to the preset grayscale value and actual brightness data of each pixel in step S130 specifically includes the following steps:

[0086] S131 . Perform brightness-grayscale curve fitting according to the preset grayscale value and actual brightness data of the pixel.

[0087] Exemplarily, the brightness-grayscale curve represents the functional relationship between the display brightness of a pixel and the corresponding grayscale value. The pixels in each display area of ​​the display panel are lit with the corresponding preset grayscale value, and the actual brightness data of the pixel at the preset grayscale value is measured. According to the preset grayscale value and the actual brightness data of the two groups of pixels, the brightness-grayscale curve of the pixel can be fitted and established.

[0088] S132 , inputting the preset grayscale value of the pixel and the corresponding actual brightness data into the brightness-grayscale curve, and calculating the brightness data of the pixel at the target grayscale value.

[0089] Exemplarily, according to the established brightness-grayscale curve of the corresponding pixel, a set of preset grayscale values ​​and actual brightness data of the pixel is selected, and the preset grayscale value and the corresponding actual brightness data are input into the brightness-grayscale curve of the pixel, so that the brightness data of the pixel at the target grayscale value when the entire display panel is lit with the same target grayscale value can be calculated. In this way, the brightness data of each pixel in the display panel at the same target grayscale value can be calculated.

[0090] S133 , generating a brightness file corresponding to the target grayscale value according to the brightness data of each pixel in the display panel at the target grayscale value.

[0091] Exemplarily, based on the brightness data of each pixel at the target grayscale value, a one-to-one mapping relationship is established between the compensated brightness data of the pixels at each position at the corresponding target grayscale value, and a new CSV format file is generated and saved, thereby obtaining the corresponding brightness file when the display panel is lit at the target grayscale value.

[0092] Based on the above embodiments, Figure 5 FIG. 1 is a schematic diagram of a specific flow chart of step S131 in a method for generating a brightness file of a display panel provided by an embodiment of the present invention. Figure 5 As shown, optionally, performing brightness-grayscale curve fitting according to the preset grayscale value and actual brightness data of the pixel in step S131 specifically includes the following steps:

[0093] S1311, obtaining the brightness value of each row of pixels in the central area of ​​the display panel at the highest grayscale value as a brightness reference value; wherein the central area is an area located at the length center of the display panel.

[0094] For example, since the display brightness difference between the central area and other display areas of the display panel is small, the brightness value of the pixels in the central area at the highest grayscale value, i.e., grayscale 255, is obtained, and the brightness value at grayscale 255 is used as the brightness reference value to calculate the brightness-grayscale curve of each pixel in different display areas of the display panel.

[0095] S1312: Calculate the gamma index according to the highest grayscale value and the brightness reference value, as well as the preset grayscale value of the pixel and the corresponding actual brightness data to obtain a brightness-grayscale curve of the pixel.

[0096] For example, the expression of the brightness-grayscale curve can be expressed by formula (1), and formula (1) can be expressed in the following form:

[0097] y2=y1×(x2 / x1) Gamma (1)

[0098] Wherein, x represents a preset grayscale value, y represents actual brightness data, (x1, y1) represents a set of preset grayscale values ​​and actual brightness data of a pixel, (x2, y2) represents the highest grayscale value and the brightness reference value, and Gamma represents the gamma index.

[0099] Measure the actual brightness data of a pixel at a preset grayscale value, input the preset grayscale value and the actual brightness data, as well as the maximum grayscale value and the brightness reference value into the brightness-grayscale curve expression, and the gamma index can be calculated. Therefore, the brightness-grayscale curve of the pixel can be expressed as y2=Lv255×(x2 / 255) Gamma In the form of . Gamma is a known quantity, 255 represents 255 grayscale, and Lv255 represents the brightness of the pixels in the center area at 255 grayscale.

[0100] For example, taking the calculation of the brightness data of a pixel at a target grayscale value of 220 as an example, the highest grayscale value, the brightness reference value, and the target grayscale value are input into the brightness-grayscale curve of the pixel, and an expression represented by the form of formula (2) can be obtained. Formula (2) can be represented as follows:

[0101] y2=Lv255×(220 / 255) Gamma (2)

[0102] Among them, Gamma is a known quantity.

[0103] It should be noted that when the brightness reference value of the pixels in the central area at a grayscale of 255 is used as one of the sets of grayscale and brightness data, when calculating the brightness data of each pixel in the display panel at a target grayscale value, the brightness reference value of the pixels in the central area at a grayscale of 255 is required to be used as a set of known grayscale and brightness data. In this way, the brightness data of each pixel in the display panel at the target grayscale value can be calculated.

[0104] Based on the above embodiments, Figure 6 FIG. 1 is a schematic diagram of a specific flow chart of step S131 in another method for generating a brightness file of a display panel provided by an embodiment of the present invention. Figure 6 As shown, optionally, performing brightness-grayscale curve fitting according to the preset grayscale value and actual brightness data of the pixel in step S131 specifically includes the following steps:

[0105] S1313. Obtain actual brightness data of the pixel at at least two different preset grayscale values.

[0106] Exemplarily, the brightness of the display panel lit at at least two target grayscale values ​​is measured to obtain actual brightness data of each pixel at at least two different preset grayscale values ​​corresponding to the target grayscale values. In other words, at least two different sets of preset grayscale values ​​and actual brightness data of each pixel in the display panel are obtained.

[0107] S1314: Calculate a gamma index according to at least two sets of preset grayscale values ​​of the pixel and corresponding actual brightness data to obtain a brightness-grayscale curve of the pixel.

[0108] Exemplarily, referring to the above embodiment, the expression of the brightness-grayscale curve can be expressed by formula (1). The difference is that (x1, y1) represents a set of preset grayscale values ​​and actual brightness data of the pixel, and (x2, y2) represents another set of preset grayscale values ​​and actual brightness data of the pixel. The two sets of preset grayscale values ​​and the corresponding actual brightness data of the pixel obtained by measurement are input into the expression of the brightness-grayscale curve to calculate the gamma index. Therefore, the brightness-grayscale curve of the pixel calculated can be expressed as y2=y1×(x2 / x1) Gamma In the form of . Gamma is a known quantity. According to the brightness-grayscale curve, it is only necessary to input a set of preset grayscale values ​​and actual brightness data of the pixel, as well as the target grayscale value into the brightness-grayscale curve to obtain the brightness data of the pixel at the target grayscale value.

[0109] For example, taking the calculation of the brightness data of a pixel at a target grayscale value of 220 as an example, the actual brightness data of the pixel at a preset grayscale value of 128 is obtained, and the actual brightness data at 128 grayscale and the target grayscale value are input into the brightness-grayscale curve of the pixel, and an expression represented by the form of formula (3) can be obtained. Formula (3) can be represented as follows:

[0110] y2=Lv128×(220 / 128) Gamma (3)

[0111] Among them, Gamma is a known quantity.

[0112] In this way, the brightness data of the pixel under the target grayscale value of 220 grayscale can be calculated.

[0113] Based on the above embodiments, Figure 7 FIG. 1 is a flow chart of another method for generating a brightness file of a display panel provided by an embodiment of the present invention. Figure 7 As shown, optionally, before step S130, the following steps are also included:

[0114] S140: Pre-process the actual brightness data by denoising and / or filtering.

[0115] For example, after lighting up different display areas of the display panel with different preset grayscale values, the actual brightness data of the pixels in each display area is measured. Pre-processing operations such as denoising and / or filtering are performed on the obtained actual brightness data to improve the accuracy of the actual brightness data and facilitate the subsequent generation of an accurate brightness file.

[0116] The brightness file generation method of the display panel provided in the present embodiment measures the actual brightness data corresponding to the pixel under at least two different preset grayscale values, and performs corresponding pre-processing operations on the actual brightness data. According to the expression of the brightness-grayscale curve, the brightness-grayscale curve of the corresponding pixel can be fitted and established, so that the brightness data of the pixel under the target grayscale value can be accurately calculated, so as to generate a brightness file according to the brightness data of each pixel.

[0117] The embodiment of the present invention also provides a device for generating a brightness file of a display panel. Figure 8 FIG. 1 is a schematic diagram of the structure of a brightness file generating device for a display panel provided by an embodiment of the present invention. Figure 8 As shown, optionally, the brightness file generating device 100 of the display panel includes:

[0118] The pixel lighting module 101 is used to light up each row of pixels in each display area of ​​the display panel with different preset grayscale values, wherein at least two display areas are distributed along the length direction of the display panel, and different preset grayscale values ​​are used to light up different display areas;

[0119] The data acquisition module 102 is used to capture the display screen of the display panel and obtain the actual brightness data of each pixel at a preset grayscale value;

[0120] The brightness file generating module 103 is used to generate a brightness file according to the preset grayscale value and actual brightness data of each pixel.

[0121] The brightness file generation device of the display panel provided in the embodiment of the present invention can execute the brightness file generation method of the display panel provided in any embodiment of the present invention, and has the functional modules and beneficial effects corresponding to the execution method. Specifically, for a display panel whose length-to-width ratio is greater than 3 and whose driving chip is arranged at the lower frame position, the pixel lighting module 101 lights up each row of pixels in each display area distributed along the length direction of the display panel with different preset grayscale values, so that the brightness difference between the display areas is less than the set difference threshold, which is conducive to improving the accuracy of the display screen data collected by the camera. The data acquisition module 102 obtains the actual brightness data of each pixel at the corresponding preset grayscale value according to the display screen of the display panel captured by the camera. The brightness file generation module 103 can calculate the brightness data corresponding to each pixel when the display panel is lit with the same grayscale value according to the preset grayscale value and the actual brightness data of each pixel, and generate a brightness file. The brightness file generated by the brightness file generating device of the display panel provided in the embodiment of the present invention can compensate for the brightness of each pixel when the display panel is lit with the same grayscale, thereby improving the situation where the brightness difference of the display picture at different positions on the display panel is too large, which is beneficial to improving the accuracy of the display picture data obtained by the camera with the same exposure parameters.

[0122] On the basis of the above embodiment, optionally, along the length direction of the display panel, the display panel includes at least three display areas; wherein the at least three display areas include a central area located at the length center of the display panel.

[0123] The pixel lighting module 101 is also used to light up each row of pixels in each display area with different preset grayscale values ​​having a single change trend along the end away from the driver chip to the end close to the driver chip.

[0124] Based on the above embodiments, optionally, the brightness file generating module 103 includes:

[0125] A curve fitting unit, used for performing brightness-grayscale curve fitting according to a preset grayscale value and actual brightness data of a pixel;

[0126] A brightness data calculation unit, used to input the preset grayscale value of the pixel and the corresponding actual brightness data into the brightness-grayscale curve, and calculate the brightness data of the pixel at the target grayscale value;

[0127] The file generating unit is used to generate a brightness file corresponding to the target grayscale value according to the brightness data of each pixel in the display panel at the target grayscale value.

[0128] Based on the above embodiments, optionally, the curve fitting unit includes:

[0129] The reference data calculation subunit is used to obtain the brightness value of each row of pixels in the central area of ​​the display panel at the highest grayscale value as the brightness reference value; wherein the central area is the area located at the length center of the display panel;

[0130] The first index calculation subunit is used to calculate the gamma index according to the highest grayscale value and the brightness reference value, as well as the preset grayscale value of the pixel and the corresponding actual brightness data, so as to obtain the brightness-grayscale curve of the pixel.

[0131] Based on the above embodiments, optionally, the curve fitting unit includes:

[0132] A brightness data acquisition subunit, used to acquire actual brightness data of a pixel at at least two different preset grayscale values;

[0133] The second index calculation subunit is used to calculate the gamma index according to at least two sets of preset grayscale values ​​of the pixel and the corresponding actual brightness data to obtain the brightness-grayscale curve of the pixel.

[0134] Based on the above embodiments, optionally, the brightness file generating device 100 for a display panel further includes:

[0135] The brightness data pre-processing module is used for pre-processing the actual brightness data by denoising and / or filtering.

[0136] The embodiment of the present invention also provides a compensation method for a display panel. For a display panel whose length-to-width ratio is greater than 3 and whose driver chip is disposed at the lower frame position, the compensation method for the display panel adopts the brightness file generation method for the display panel provided in any of the above embodiments to generate a brightness file for the display panel at the same target grayscale value, and compensates the display brightness of each pixel according to the brightness file, thereby compensating the display image of the entire display panel to reduce the display brightness difference at different positions of the entire display panel, thereby ensuring the accuracy of the display image data of the display panel captured by the camera under the same exposure parameters, and facilitating the subsequent accurate compensation of the display non-uniformity in the entire display image.

[0137] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for generating a brightness file of a display panel, characterized in that: A driving chip is disposed at the lower frame of the display panel; a direction from one end away from the driving chip to one end close to the driving chip is the length direction of the display panel, and a ratio of the length to the width of the display panel is greater than 3; The method for generating a brightness file of a display panel comprises: Lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values, wherein at least two of the display areas are distributed along the length direction of the display panel, and the preset grayscale values ​​used to light up different display areas are different; Shooting a display screen of the display panel to obtain actual brightness data of each pixel at the preset grayscale value; A brightness file is generated according to the preset grayscale value of each pixel and the actual brightness data.

2. The method for generating a brightness file of a display panel according to claim 1, characterized in that: The display panel includes a long strip display screen, and the long strip display screen includes a first sub-display screen and a second sub-display screen; the first sub-display screen and the second sub-display screen are arranged along the length direction of the display panel, and the first sub-display screen and the second sub-display screen are an integrated structure; the display screen includes an extended screen or a folding screen; The driving chip is arranged at the lower frame of the long strip display screen.

3. The method for generating a brightness file of a display panel according to claim 1, characterized in that: Along the length direction of the display panel, the display panel includes at least three display areas; wherein the at least three display areas include a central area located at the length center of the display panel; The step of lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​comprises: Lighting up each row of pixels in each display area with different preset grayscale values ​​having a single change trend from one end away from the driver chip to one end close to the driver chip; Preferably, the display area includes at least one row of pixels.

4. The method for generating a brightness file of a display panel according to claim 3, characterized in that: Along the direction from one end of the display panel away from the driving chip to one end close to the driving chip, the preset grayscale values ​​corresponding to the pixels in each of the display areas change in a decreasing trend.

5. The method for generating a brightness file of a display panel according to claim 3, characterized in that: The display panel includes at least three display areas, and the at least three display areas include: a first display area located at an end away from the driving chip, a second display area located at an end close to the driving chip, and a third display area located between the first display area and the second display area; the preset grayscale value includes a first grayscale value, a second grayscale value and a third grayscale value; The lighting up each row of pixels in each display area of ​​the display panel with different preset grayscale values ​​includes: Lighting up each row of the pixels in the first display area with the first grayscale value; Lighting up each row of the pixels in the second display area with the second grayscale value; Lighting up each row of the pixels in the third display area with the third grayscale value; Preferably, the third grayscale value is a target grayscale value, the first grayscale value is a sum of the target grayscale value and a grayscale compensation value, and the second grayscale value is a difference between the target grayscale value and the grayscale compensation value.

6. The method for generating a brightness file of a display panel according to claim 1, characterized in that: The step of generating a brightness file according to the preset grayscale value of each pixel and the actual brightness data includes: Performing brightness-grayscale curve fitting according to the preset grayscale value of the pixel and the actual brightness data; Inputting the preset grayscale value of the pixel and the corresponding actual brightness data into the brightness-grayscale curve to calculate the brightness data of the pixel at the target grayscale value; The brightness file corresponding to the target grayscale value is generated according to the brightness data of each pixel in the display panel at the target grayscale value.

7. The method for generating a brightness file of a display panel according to claim 6, characterized in that: The performing brightness-grayscale curve fitting according to the preset grayscale value of the pixel and the actual brightness data includes: Obtaining the brightness value of each row of pixels in the central area of ​​the display panel at the highest grayscale value as a brightness reference value; wherein the central area is an area located at the length center of the display panel; A gamma index is calculated according to the highest grayscale value and the brightness reference value, as well as the preset grayscale value of the pixel and the corresponding actual brightness data to obtain the brightness-grayscale curve of the pixel.

8. The method for generating a brightness file of a display panel according to claim 6, characterized in that: The performing brightness-grayscale curve fitting according to the preset grayscale value of the pixel and the actual brightness data includes: Acquire the actual brightness data of the pixel at at least two different preset grayscale values; A gamma index is calculated according to at least two sets of the preset grayscale values ​​of the pixel and the corresponding actual brightness data to obtain the brightness-grayscale curve of the pixel.

9. A device for generating a brightness file of a display panel, characterized in that: include: A pixel lighting module, used to light up each row of pixels in each display area of ​​the display panel with different preset grayscale values, wherein at least two of the display areas are distributed along the length direction of the display panel, and the preset grayscale values ​​used to light up different display areas are different; A data acquisition module, used for photographing the display screen of the display panel and acquiring actual brightness data of each pixel at the preset grayscale value; The brightness file generating module is used to generate a brightness file according to the preset grayscale value of each pixel and the actual brightness data.

10. A compensation method for a display panel, characterized in that: The brightness file of the display panel generated by the brightness file generation method of the display panel according to any one of claims 1 to 8 is used to compensate the display image of the display panel.

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