Splicing display device and control method, control device and storage medium thereof

Abstract

The embodiment of the present application provides a spliced ​​display device and a control method thereof, a control device and a storage medium. The control method of the spliced ​​display device includes obtaining a first grayscale image, determining a spatial heat impact image of the spliced ​​display device based on the first grayscale image, wherein the first grayscale image is obtained by graying the original image; performing time accumulation on the spatial heat impact image to obtain a time heat accumulation image; mapping the time heat accumulation image to a second grayscale image; and subtracting the second grayscale image from the R channel component in the original image to obtain a compensated image. The embodiment of the present application can reduce the afterimage, so that the screen display image is uniform when the entire screen switches to the same grayscale display, thereby improving the display effect and user experience.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to a spliced ​​display device and a control method, a control device and a storage medium thereof. Background Art

[0002] At present, spliced ​​display devices are widely used. For example, LCD (Liquid Crystal Display) with LED backlight still occupies a dominant position in the market. As a passive light-emitting display device, its light source utilization efficiency and subjective image quality are difficult to improve. In order to obtain better display effects on electronic devices such as televisions, mobile phones, and wearables, new display technologies OLED (Organic Light-Emitting Diode), MiniLED (known as "submillimeter light-emitting diode") and MicroLED (LED miniaturization) technologies have emerged. LED refers to light-emitting diodes. MiniLED is smaller in size than ordinary LEDs and has a more delicate display effect. Compared with OLED, MiniLED saves power, has a longer display life, is low in cost, and has similar display effects.

[0003] However, during the display process of the spliced ​​display device, for example, the luminous efficiency of the MiniLED lamp used for screen display is directly affected by the thermal effect of the MiniLED lamp, and the thermal effect of the MiniLED lamp is generated by the magnitude of the current value driving it to emit light. During the display process of the MiniLED spliced ​​display device, the magnitude of the driving current value of the MiniLED lamp is positively correlated with the magnitude of the grayscale value displayed. The larger the grayscale value, the larger the driving current value, and the more heat the MiniLED lamp generates.

[0004] When different grayscales are displayed in different areas of the screen, the heat accumulation in different areas of the screen is different, and therefore the luminous efficiency of the MiniLED lamps in different areas of the screen is different. For example, in areas with more heat accumulation, the luminous efficiency of the MiniLED lamps is reduced, while in areas with less heat accumulation, the luminous efficiency of the MiniLED lamps is still relatively high. After the screen has been lit for a long time, when the entire screen is switched to the same grayscale display, afterimages are likely to occur in areas with more heat accumulation and low MiniLED luminous efficiency, ultimately resulting in an uneven display of the screen when the entire screen is switched to the same grayscale display, reducing the display effect and affecting the user experience. Summary of the invention

[0005] In view of the shortcomings of the existing methods, the present application proposes a spliced ​​display device and its control method, a control device and a storage medium, so as to solve the technical problem in the prior art that afterimages are easily generated in areas with high heat accumulation and low MiniLED luminous efficiency, which ultimately leads to uneven display of the screen when the entire screen switches to the same grayscale display.

[0006] In a first aspect, an embodiment of the present application provides a control method for a spliced ​​display device, comprising:

[0007] Acquire a first grayscale image, and determine a spatial heat impact image of the spliced ​​display device based on the first grayscale image, wherein the first grayscale image is obtained by grayscale processing based on the original image;

[0008] Performing temporal accumulation on the spatial heat impact image to obtain a temporal heat accumulation image;

[0009] Mapping the time heat accumulation image into a second grayscale image;

[0010] The second grayscale image is subtracted from the R channel component in the original image to obtain a compensated image.

[0011] In a possible implementation, determining, in a spatial dimension, based on the first grayscale image, a spatial heat impact image of the spliced ​​display device includes:

[0012] Simulating heat diffusion information of the pattern in the first grayscale image to generate a pattern edge diffusion image;

[0013] Based on the pattern edge diffusion image, a spatial heat impact image of the tiled display device is determined.

[0014] In a possible implementation, simulating heat diffusion information of a pattern in a first grayscale image to generate a pattern edge diffusion image includes:

[0015] A first area outside the edge of the pattern in the first grayscale image is reduced by a grayscale value, and a second area within the edge of the pattern in the first grayscale image is increased by a grayscale value, the increased grayscale value is equal to the reduced grayscale value, to obtain a pattern edge diffusion image; or a first area outside the edge of the pattern in the first grayscale image is increased by a grayscale value, and a second area within the edge of the pattern in the first grayscale image is reduced by a grayscale value, the increased grayscale value is equal to the reduced grayscale value, to obtain a pattern edge diffusion image.

[0016] In a possible implementation, the spliced ​​display device includes a spliced ​​display panel, and the spliced ​​display panel includes at least two display panels spliced ​​together;

[0017] And, determining a spatial heat impact image of the spliced ​​display device based on the pattern edge diffusion image, including:

[0018] Slicing the pattern edge diffusion image of the same size as the spliced ​​display panel to obtain at least two unit images of the same size as the display panel;

[0019] Determining a unit space heat impact image for each unit image;

[0020] Based on each unit spatial thermal impact image, a spatial thermal impact image of the tiled display panel is determined.

[0021] In a possible implementation, determining the unit space heat impact image of each unit image includes:

[0022] Determine the heat impact data of the central unit image on itself, and obtain a first space heat impact image;

[0023] Determine the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second space heat impact images; the surrounding unit images are located around the central unit image;

[0024] The first space heat impact image and the plurality of second space heat impact images are added together to obtain a unit space heat impact image.

[0025] In a possible implementation, determining the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second spatial heat impact images includes:

[0026] The surrounding unit images and the central unit image are cut into N equal image blocks longitudinally and / or cut into N equal image blocks transversely, or cut into N equal image blocks longitudinally and transversely, and the heat impact data of the surrounding unit images on the central unit image are determined to obtain multiple second spatial heat impact images.

[0027] In a possible implementation, the surrounding unit images and the central unit image are cut into N equal image blocks longitudinally and / or cut into N equal image blocks horizontally, and the heat impact data of the surrounding unit images on the central unit image are determined to obtain a plurality of second spatial heat impact images, including:

[0028] The surrounding unit images that are directly adjacent to the central unit image in the horizontal direction are first surrounding unit images. The first surrounding unit images and the central unit image are respectively divided into N1 equal image blocks in the vertical direction, and the heat impact data of the first surrounding unit image on the central unit image is determined to obtain a third heat impact image. The plurality of second space heat impact images include a plurality of third heat impact images.

[0029] The surrounding unit image directly adjacent to the central unit image vertically is the third surrounding unit image. The third surrounding unit image and the central unit image are horizontally divided into N2 equal image blocks respectively, and the heat impact data of the third surrounding unit image on the central unit image is determined to obtain the seventh heat impact image; the multiple second space heat impact images include multiple seventh heat impact images.

[0030] In a possible implementation, the surrounding unit images and the central unit image are cut into N equal image blocks longitudinally and / or cut into N equal image blocks horizontally, and the heat impact data of the surrounding unit images on the central unit image are determined to obtain a plurality of second spatial heat impact images, including:

[0031] The surrounding unit image that is not directly adjacent to the central unit image is the second surrounding unit image. The second surrounding unit image and the central unit image are respectively divided longitudinally into N1 equal image blocks, and the longitudinal heat impact data of the second surrounding unit image on the central unit image is determined to obtain a fourth heat impact image; the second surrounding unit image and the central unit image are respectively divided transversely into N2 equal image blocks, and the transverse heat impact data of the second surrounding unit image on the central unit image is determined to obtain a fifth heat impact image; the fourth heat impact image and the fifth heat impact image are added and averaged to obtain a sixth heat impact image; the multiple second space heat impact images include multiple sixth heat impact images.

[0032] In a possible implementation, temporal accumulation is performed on the spatial heat impact image to obtain a temporal heat accumulation image, including:

[0033] Construct a thermal grayscale lookup table;

[0034] When the grayscale value of the pixel of the first grayscale image is greater than or equal to the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is added to the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame, and the heat accumulation value of the pixel of the previous n frames of image is obtained as the time heat accumulation image;

[0035] When the grayscale value of a pixel of the first grayscale image is less than the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is subtracted from the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame to obtain the heat accumulation value of the pixel of the previous n frames of image as the time heat accumulation image.

[0036] In a possible implementation, constructing a thermal grayscale lookup table includes:

[0037] Determine a correspondence between a plurality of grayscale values ​​and a plurality of stable heat values, wherein the stable heat value is the heat of the spliced ​​display device when an image with the same grayscale value is continuously displayed on the spliced ​​display device in full screen for a time period that reaches a threshold value;

[0038] A corresponding relationship between at least one grayscale value within the designed calorific value range and at least one stable calorific value is selected as a calorific grayscale lookup table.

[0039] In a possible implementation, the original image includes an RGB image.

[0040] In a second aspect, an embodiment of the present application provides a control device for a spliced ​​display device, comprising:

[0041] A spatial heat module, used to obtain a first grayscale image, and determine a spatial heat impact image of the spliced ​​display device based on the first grayscale image, wherein the first grayscale image is obtained by grayscale processing based on the original image;

[0042] A time heat module is used to perform time accumulation on the spatial heat impact image to obtain a time heat accumulation image;

[0043] A second grayscale module, used for mapping the time-heat accumulation image into a second grayscale image;

[0044] The compensation module is used to subtract the second grayscale image from the R channel component in the original image to obtain a compensated image.

[0045] In a third aspect, an embodiment of the present application provides a spliced ​​display device, including:

[0046] A spliced ​​display panel, the spliced ​​display panel includes a plurality of display panels spliced ​​together;

[0047] Memory;

[0048] A processor, electrically connected to the memory and the spliced ​​display panel;

[0049] The memory stores a computer program, and the computer program is executed by the processor to implement the control method of the spliced ​​display device according to the first aspect.

[0050] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store computer instructions. When the computer instructions are executed on a computer, the computer can execute the control method of the spliced ​​display device in the first aspect.

[0051] The beneficial technical effects brought about by the technical solution provided by the embodiment of the present application include:

[0052] The control method of the spliced ​​display device provided in the embodiment of the present application determines the spatial heat impact image of the spliced ​​display device based on the first grayscale image in the spatial dimension, the first grayscale image is obtained by grayscale processing based on the RGB image, and in the time dimension, the spatial heat impact image is temporally accumulated to obtain a time heat accumulation image, and then the time heat accumulation image is mapped to a second grayscale image, the second grayscale image is a compensation image, that is, the grayscale value that needs to be compensated; then, the R channel component in the RGB image is subtracted from the second grayscale image to obtain a compensated image.

[0053] Since the luminous efficiency of the light-emitting unit is reduced in the area of ​​the screen where more heat is accumulated, and the luminous efficiency of the light-emitting unit is still high in the area where less heat is accumulated, afterimages are likely to occur in the area where more heat is accumulated and the luminous efficiency of the light-emitting unit is low. Therefore, the embodiment of the present application obtains a heat accumulation image in the spatial dimension and the time dimension, and maps the heat accumulation image into a grayscale image, that is, a compensation image. It is necessary to lower the image grayscale value in the area with high luminous efficiency, and subtract the second grayscale image from the R channel component of the RGB image to make the grayscale value smaller, thereby reducing the afterimage, so that the screen display is uniform when the entire screen switches to the same grayscale display, thereby improving the display effect and user experience.

[0054] Moreover, according to the background description, the luminous efficiency of MiniLED lamps is affected by temperature. When heat accumulation reaches a certain level, the temperature will rise, causing the luminous efficiency of MiniLED lamps to decrease. After the MiniLED screen lights up a certain pattern for a long time (the pattern is non-white and the background is all white), the temperature in the pattern area is low (less heat accumulation), and the temperature in the background area is high (more heat accumulation). The luminous efficiency of MiniLED lamps in places with high temperatures becomes lower, and the luminous efficiency of MiniLED lamps in places with low temperatures is still high. In order to make the picture display more uniform, the image grayscale value of the area with high luminous efficiency needs to be lowered a little. The R channel component of the RGB image can be subtracted from the second grayscale image to make the grayscale value smaller, thereby reducing the afterimage, so that the screen display is uniform when the entire screen switches to the same grayscale display, improving the display effect and user experience.

[0055] Additional aspects and advantages of the present application will be partially given in the following description, which will become apparent from the following description, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0057] Figure 1A schematic flow chart of a control method of a spliced ​​display device provided in an embodiment of the present application;

[0058] Figure 2 A schematic diagram of a flow chart for determining the effect of spatial heat of a spliced ​​display device on an image in a spatial dimension provided by an embodiment of the present application;

[0059] Figure 3a A schematic diagram of heat diffusion results of a heat source provided in an embodiment of the present application after 10 time units;

[0060] Figure 3b A schematic diagram of heat diffusion results of a heat source provided in an embodiment of the present application after 15 time units;

[0061] Figure 3c A schematic diagram of heat diffusion results of a heat source provided in an embodiment of the present application after 50 time units;

[0062] Figure 4 A schematic diagram of simulating heat diffusion information of a pattern in a first grayscale image and generating a pattern edge diffusion image provided by an embodiment of the present application;

[0063] Figure 5 A schematic diagram of a spliced ​​display panel including a pattern edge diffusion image provided in an embodiment of the present application;

[0064] Figure 6 A schematic diagram of a longitudinal cut provided in an embodiment of the present application;

[0065] Figure 7 A schematic diagram of another longitudinal cutting method provided in an embodiment of the present application;

[0066] Figure 8 A schematic diagram of a horizontal cut provided in an embodiment of the present application;

[0067] Fig. 9 A schematic diagram of a unit space heat impact image of a unit image A5 provided in an embodiment of the present application;

[0068] Fig.10 A schematic diagram of dividing an image into multiple image blocks both horizontally and vertically provided in an embodiment of the present application;

[0069] Fig.11 A schematic diagram of an A4 folding process provided in an embodiment of the present application;

[0070] Fig.12 A schematic flow chart of another control method of a spliced ​​display device provided in an embodiment of the present application;

[0071] Fig.13A schematic diagram of the structure of a control device for a spliced ​​display device provided in an embodiment of the present application;

[0072] Fig.14 A rendering of a control method for a spliced ​​display device provided in an embodiment of the present application;

[0073] Fig.15 Provided in the embodiments of this application Fig.14 An enlarged view of one of the renderings. DETAILED DESCRIPTION

[0074] The present application is described in detail below, and examples of embodiments of the present application are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components with the same or similar functions. In addition, if the detailed description of the known technology is unnecessary for the features of the present application shown, it will be omitted. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application.

[0075] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in general dictionaries should be understood to have meanings consistent with those in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0076] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "one", "said", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0077] The inventors of the present application conducted research and found that in solving the problem of uneven display effects of MiniLED splicing display devices, predicting the heat at different positions of the screen is the key.

[0078] Due to the different heat accumulation in different areas of the screen, the luminous efficiency of MiniLED lamps in different areas of the screen is different. Due to the different luminous efficiency of MiniLED lamps in different areas, the screen will have residual images when the full screen is switched to the same grayscale display.

[0079] For example, after the screen has been turned on for a period of time, more heat accumulates in the first area, resulting in a 30% decrease in the luminous efficiency of the MiniLED in the first area. Less heat accumulates in the second area, resulting in a 10% decrease in the luminous efficiency of the MiniLED in the second area. The luminous efficiency of the MiniLED in the first area is lower than that of the MiniLED in the second area. If the screen switches to the same brightness, afterimages are likely to appear in the first area.

[0080] Afterimages are likely to occur in areas with high heat accumulation and low MiniLED luminous efficiency, which will eventually lead to uneven display of the screen when the entire screen switches to the same grayscale display, reducing the display effect and affecting the user experience.

[0081] The present application provides a spliced ​​display device and a control method thereof, a control device and a storage medium, aiming to solve the above technical problems in the prior art.

[0082] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments.

[0083] The present application provides a control method for a spliced ​​display device, the spliced ​​display device may include a MiniLED spliced ​​display device, and the flow chart of the method is as follows: Figure 1 As shown, the method includes:

[0084] S1: Acquire a first grayscale image, and determine a spatial heat impact image of the spliced ​​display device based on the first grayscale image, wherein the first grayscale image is obtained by grayscale processing of the original image;

[0085] S2: Perform temporal accumulation of the spatial heat impact image to obtain a temporal heat accumulation image;

[0086] S3: Mapping the time heat accumulation image into a second grayscale image;

[0087] S4: Subtract the second grayscale image from the R channel component in the original image to obtain a compensated image.

[0088] The second grayscale image is a compensated image.

[0089] Optionally, the original image includes an RGB image, which is a color image, and the original image is an image input by an external video stream.

[0090] S1 is to determine the spatial heat impact image from the spatial dimension, that is, to determine the spatial heat impact image of the spliced ​​display device from the heat diffusion information dimension of the first grayscale image on the entire screen of the spliced ​​display device.

[0091] S2 is to determine the time heat impact image from the time dimension, that is, to determine the time heat accumulation image from the heat accumulation effect of the spatial heat impact images of different frames on the time line.

[0092] The control method of the spliced ​​display device provided in the embodiment of the present application determines the spatial heat impact image of the spliced ​​display device based on the first grayscale image in the spatial dimension, the first grayscale image is obtained by grayscale processing based on the RGB image, and in the time dimension, the spatial heat impact image is temporally accumulated to obtain a time heat accumulation image, and then the time heat accumulation image is mapped to a second grayscale image, the second grayscale image is a compensation image, that is, the grayscale value that needs to be compensated; then, the R channel component in the RGB image is subtracted from the second grayscale image to obtain a compensated image.

[0093] Since the luminous efficiency of the light-emitting unit is reduced in the area of ​​the screen where more heat is accumulated, and the luminous efficiency of the light-emitting unit is still high in the area where less heat is accumulated, afterimages are likely to occur in the area where more heat is accumulated and the luminous efficiency of the light-emitting unit is low. Therefore, the embodiment of the present application obtains a heat accumulation image in the spatial dimension and the time dimension, and maps the heat accumulation image into a grayscale image, that is, a compensation image. It is necessary to lower the image grayscale value in the area with high luminous efficiency, and subtract the second grayscale image from the R channel component of the RGB image to make the grayscale value smaller, thereby reducing the afterimage, so that the screen display is uniform when the entire screen switches to the same grayscale display, thereby improving the display effect and user experience.

[0094] Moreover, according to the background description, the luminous efficiency of MiniLED lamps is affected by temperature. When heat accumulation reaches a certain level, the temperature will rise, causing the luminous efficiency of MiniLED lamps to decrease. After the MiniLED screen lights up a certain pattern for a long time (the pattern is non-white and the background is all white), the temperature in the pattern area is low (less heat accumulation), and the temperature in the background area is high (more heat accumulation). The luminous efficiency of MiniLED lamps in places with high temperatures becomes lower, and the luminous efficiency of MiniLED lamps in places with low temperatures is still high. In order to make the picture display more uniform, the image grayscale value of the area with high luminous efficiency needs to be lowered a little. The R channel component of the RGB image can be subtracted from the second grayscale image to make the grayscale value smaller, thereby reducing the afterimage, so that the screen display is uniform when the entire screen switches to the same grayscale display, improving the display effect and user experience.

[0095] Optionally, the grayscale value of the second grayscale image generally does not exceed 15. In fact, the contribution of each frame to heat accumulation is very small, and the grayscale value of the second grayscale image obtained after accumulating tens of thousands of frames will not exceed 15.

[0096] The purpose of the embodiment of the present application in estimating the accumulated heat in space and time is to determine the grayscale value that needs to be compensated, and the estimation of the heat accumulation is only an intermediate variable.

[0097] In some embodiments, Figure 2 As shown, in the spatial dimension, based on the first grayscale image, determining the spatial heat impact image of the spliced ​​display device includes:

[0098] S11: simulating heat diffusion information of the pattern in the first grayscale image to generate a pattern edge diffusion image;

[0099] S12: Determine a spatial heat impact image of the spliced ​​display device based on the pattern edge diffusion image.

[0100] Optionally, the first grayscale image may include one pattern or multiple patterns, and a pattern edge diffusion model may be constructed to simulate the heat diffusion information of each pattern, thereby finally generating a pattern edge diffusion image of the entire screen.

[0101] In some embodiments, Figure 4 As shown, simulating the heat diffusion information of the pattern in the first grayscale image to generate a pattern edge diffusion image includes:

[0102] The first area outside the edge of the pattern in the first grayscale image is reduced by a grayscale value ΔG, and the second area within the edge of the pattern in the first grayscale image is increased by a grayscale value ΔG, and the increased grayscale value ΔG is equal to the reduced grayscale value ΔG, so as to obtain a pattern edge diffusion image (such as Figure 4 shown).

[0103] Alternatively, a grayscale value ΔG is increased in a first area outside the edge of the pattern in the first grayscale image, and a grayscale value ΔG is decreased in a second area within the edge of the pattern in the first grayscale image. The increased grayscale value ΔG is equal to the decreased grayscale value ΔG, and a pattern edge diffusion image is obtained (not shown).

[0104] For step S11, two solutions can be specifically adopted to simulate the heat diffusion information of the pattern in the first grayscale image and generate a pattern edge diffusion image, as follows:

[0105] 1. Using the two-dimensional diffusion equation

[0106] The heat diffusion of the spliced ​​display device satisfies the two-dimensional heat diffusion equation, which can be written as follows:

[0107]

[0108] By using forward difference for the time term and central difference for the space term, the discrete form of the equation can be obtained as follows:

[0109]

[0110] In the above formula, u represents the heat value of the heat source, v represents the diffusion speed, t represents time, x represents the heat diffusion distance of the heat source in the longitudinal direction, y represents the heat diffusion distance of the heat source in the transverse direction, and n represents the time unit.

[0111] The above diffusion process is modeled, a pattern heat diffusion model (i.e., a two-dimensional heat diffusion model) is constructed, and a program simulation can be used to obtain a visual result such as Figure 3a to Figure 3c As shown, Figure 3a to Figure 3c The heat diffusion results of the heat source after 10, 15 and 50 time units are shown respectively.

[0112] It should be noted that when the pattern is lit on the screen of the spliced ​​display device for a long time, the heat in the area where the pattern is located will diffuse, and the heat diffusion process can be represented by the above-mentioned pattern heat diffusion model. The first grayscale image is input into the pattern heat diffusion model, and the pattern heat diffusion model outputs a pattern edge diffusion image after simulated heat diffusion.

[0113] Figure 3a to Figure 3c The figure shows the heat diffusion results of the heat source after different time periods. The higher the pattern is, the higher the heat is. When the time is short, the heat source range is small and the heat is high; when the time is long, the heat source range is large and the heat is low. The first grayscale image is input into the pattern heat diffusion model to obtain a pattern edge diffusion image after simulating heat diffusion. The obtained pattern edge diffusion image is similar to the image obtained after Gaussian edge blur.

[0114] 2. Use Gaussian blur

[0115] In the actual application process, considering that the two-dimensional heat diffusion equation has a large amount of calculation and cannot achieve real-time factors, in order to achieve real-time factors, the edge of the first grayscale image is blurred by Gaussian blur. The specific operations are as follows:

[0116] Within a certain range, with the edge of the pattern of the first grayscale image as the boundary, if the pattern grayscale is lower than the background grayscale, the grayscale value of the pixel inside the pattern increases, and the grayscale value of the pixel outside decreases. If the pattern grayscale is higher than the background grayscale, the grayscale value of the pixel inside the pattern decreases, and the grayscale value of the pixel outside increases.

[0117] like Figure 4As shown, if the background of the first grayscale image is white and the pattern is black, the edge of the pattern of the first grayscale image is used as the boundary, the grayscale value of a certain pixel point inside the pattern of the first grayscale image is increased by ΔG, and the grayscale value of the pixel point at the mirror image position is reduced by ΔG. The closer the pixel point is to the edge of the pattern of the first grayscale image, the more the grayscale value is increased / decreased. If the background of the first grayscale image is black and the pattern is white, the edge of the pattern of the first grayscale image is used as the boundary, the grayscale value of a certain pixel point inside the pattern of the first grayscale image is reduced by ΔG, and the grayscale value of the pixel point at the mirror image position is increased by ΔG. Figure 4 As shown, the pattern with clear boundaries in the original first grayscale image is transformed into a pattern with blurred boundaries, forming a pattern edge diffusion image. Figure 4 The middle rectangle represents a pattern, and the colors of the three nested rectangles gradually become lighter from the inside to the outside, indicating the diffusion of heat. Figure 4 As just an example, the first grayscale image may further include multiple patterns.

[0118] It can be understood that the total amount of heat is constant. If the grayscale value is used to simulate the temperature, then the total amount of grayscale value is constant. The diffusion process can be simulated as the pixels near the edge of the image are reduced and shifted to a symmetrical position to ensure that the total amount of grayscale value is constant.

[0119] In some embodiments, the spliced ​​display device includes a spliced ​​display panel, and the spliced ​​display panel includes at least two display panels spliced ​​together; the spliced ​​display panel can be called a spliced ​​screen, and the display panel can be called a unit screen.

[0120] And, determining a spatial heat impact image of the spliced ​​display device based on the pattern edge diffusion image, including:

[0121] Slicing the pattern edge diffusion image of the same size as the spliced ​​display panel to obtain at least two unit images of the same size as the display panel;

[0122] Determining a unit space heat impact image for each unit image;

[0123] Based on each unit spatial thermal impact image, a spatial thermal impact image of the tiled display panel is determined.

[0124] In some embodiments, determining the unit spatial thermal impact image of each unit image includes:

[0125] Determine the heat impact data of the central unit image on itself, and obtain a first space heat impact image;

[0126] Determine the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second space heat impact images; the surrounding unit images are located around the central unit image;

[0127] The first space heat impact image and the plurality of second space heat impact images are added together to obtain a unit space heat impact image.

[0128] The second space heat impact image may be the same or different.

[0129] In some embodiments, determining the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second space heat impact images includes:

[0130] The surrounding unit images and the central unit image are cut into N equal image blocks longitudinally and / or cut into N equal image blocks transversely, or cut into N equal image blocks longitudinally and transversely, and the heat impact data of the surrounding unit images on the central unit image are determined to obtain multiple second spatial heat impact images.

[0131] In some embodiments, the surrounding unit images and the central unit image are cut into N equal image blocks longitudinally and / or cut into N equal image blocks horizontally, and the heat impact data of the surrounding unit images on the central unit image are determined to obtain a plurality of second space heat impact images, including:

[0132] The surrounding unit images that are directly adjacent to the central unit image in the horizontal direction (left and right) are first surrounding unit images. The first surrounding unit images and the central unit image are respectively divided into N1 equal image blocks in the vertical direction, and the heat impact data of the first surrounding unit image on the central unit image is determined to obtain a third heat impact image. The plurality of second space heat impact images include a plurality of third heat impact images.

[0133] The surrounding unit image directly adjacent to the central unit image vertically (up and down) is the third surrounding unit image. The third surrounding unit image and the central unit image are horizontally divided into N2 equal image blocks, and the heat impact data of the third surrounding unit image on the central unit image is determined to obtain the seventh heat impact image; the multiple second space heat impact images include multiple seventh heat impact images.

[0134] The plurality of third heat-affecting images may be the same or different.

[0135] The plurality of seventh heat impact images may be the same or different.

[0136] In some embodiments, the surrounding unit images and the central unit image are cut into N equal image blocks longitudinally and / or cut into N equal image blocks horizontally, and the heat impact data of the surrounding unit images on the central unit image are determined to obtain a plurality of second space heat impact images, including:

[0137] The surrounding unit image that is not directly adjacent to the central unit image is the second surrounding unit image. The second surrounding unit image and the central unit image are respectively divided longitudinally into N1 equal image blocks, and the longitudinal heat impact data of the second surrounding unit image on the central unit image is determined to obtain a fourth heat impact image; the second surrounding unit image and the central unit image are respectively divided transversely into N2 equal image blocks, and the transverse heat impact data of the second surrounding unit image on the central unit image is determined to obtain a fifth heat impact image; the fourth heat impact image and the fifth heat impact image are added and averaged to obtain a sixth heat impact image; the multiple second space heat impact images include multiple sixth heat impact images.

[0138] In the present application, N, N1, and N2 are all integers not less than 1. The specific number of equal parts of the image blocks can be determined according to the actual situation, and this application does not limit it.

[0139] Specifically, the heat diffusion of the spliced ​​display device can be simulated by constructing a screen characteristic model.

[0140] like Figure 5 As shown, the spliced ​​display device may include a 6×6 display module, and the spliced ​​display device may include 288 spliced ​​display panels (unit screens) arranged in an array. There are large differences in the heat diffusion characteristics within the display panel and between the display panels. Therefore, when performing thermal characteristic modeling, the seams between the display panels must be considered to more accurately perform afterimage compensation modeling.

[0141] Considering the limited range of heat diffusion, in the screen characteristic modeling process designed in this application, only the area size of the area constructed by the display panel in the range of 3×3 is considered.

[0142] like Figure 5 As shown, for a certain 3×3 area in the entire screen of the spliced ​​display device, each display panel Ai (i≥1) represents a display panel of a minimum splicing unit.

[0143] For Figure 6 The 9 display panels of the 3×3 size shown are numbered A1 to A9 from top to bottom and from left to right. For any display panel A5 in the entire large screen of the spliced ​​display device, only the heat influence of the surrounding 8 display panels on the display panel A5 can be considered.

[0144] Specifically, the pattern edge diffusion image is segmented to obtain a unit image of the same size as the display panel Ai; the size of the pattern edge diffusion image is equal to the size of the entire screen of the spliced ​​display device, and the display panel Ai (i≥1) corresponds to the unit image Ai (i≥1) one by one and has the same size.

[0145] Then, determining the unit space heat impact image of each unit image;

[0146] Then, based on each unit spatial heat impact image, a spatial heat impact image corresponding to the entire screen of the spliced ​​display device is determined. For example, each unit spatial heat impact image can be spliced ​​to form a spatial heat impact image corresponding to the entire screen.

[0147] First, determine the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second space heat impact images; the surrounding unit images are located around the central unit image. Specifically as follows:

[0148] 1. For the surrounding unit images directly adjacent to the central unit image, such as Figure 5 and Figure 6 As shown, the central unit image A5, and the surrounding unit images directly adjacent to A5 include A2, A4, A6 and A8. A4 and A6 directly adjacent to A5 on the left and right can be cut into 4 equal image blocks vertically, and the operations and calculations of A4 and A6 are the same. A2 and A8 directly adjacent to A5 on the top and bottom can be cut into 6 equal image blocks horizontally, and the operations and calculations of A2 and A8 are the same.

[0149] For example, A4 and A5 are respectively cut into four equal image blocks in the longitudinal direction, and the heat impact data of A4 on A5 are determined to obtain a third heat impact image stack A4.

[0150] The heat impact data of A4 on A5 is calculated, that is, the impact of the heat generated by A4 on A5 is calculated, which is expressed as the change of the heat accumulation value of A5.

[0151] A44 stack = (α1×A44+α2×A43+α3×A42+α4×A41)×edge diffusion coefficient β;

[0152] A43 stack = α5 × A44 stack;

[0153] A42 stack = α6 × A44 stack;

[0154] A41 stack = α7 × A44 stack;

[0155] A4 stack (third heat-affected image) = A44 stack to A41 stack for splicing.

[0156] In the above expression, A44 is the heat impact data of A4 on A51, A43 is the heat impact data of A4 on A52, A42 is the heat impact data of A4 on A53, and A41 is the heat impact data of A4 on A54.

[0157] like Figure 6As shown, A4 and A5 are cut into 4 parts longitudinally respectively. A44 is closest to A51, so A44 has the greatest influence on A51, and the corresponding coefficient α1 is also the largest; A41 is farthest from A51, so A41 has the least influence on A51, and the corresponding coefficient α4 is also the smallest. In practice, the values ​​of α1 to α4 are determined by the proportional coefficients between the heat on the heat map.

[0158] The edge diffusion coefficient β represents the diffusion characteristics between different unit images. Since there are seams between adjacent display panels (unit screens), the heat diffusion between unit images will be affected by the seams. This influence can be simulated as a diffusion coefficient β.

[0159] A52 is farther from A4, so the heat impact of A4 on A52 is smaller than that of A4 on A51, which can be expressed by multiplying A44 by a coefficient α5. In practice, only A4 is lit, and the average heat value of A52 divided by the average heat value of A51 is the value of α5, and the same applies to α6 and α7.

[0160] 2. For the surrounding unit images that are not directly adjacent to the central unit image, such as Figure 5 , Figure 7 and Figure 8 As shown, the central unit image A5, and the surrounding unit images not directly adjacent to A5 include A1, A3, A7 and A9. For example, A1 and A5 are divided twice respectively, firstly, the first division is performed, A1 and A5 are divided into 4 equal image blocks longitudinally, and the fourth heat influence image A1_col stack is obtained, and then the second division is performed, A1 and A5 are divided into 6 equal image blocks transversely, and the fifth heat influence image A1_row stack is obtained, and the fourth heat influence image A1_col stack and the fifth heat influence image A1_row stack are added and averaged to obtain the sixth heat influence image A1 stack. Similarly, the operation of A3, A7, A9 is the same as that of A1.

[0161] Calculate the heat impact data of A1 on A5, that is, calculate the impact of the heat generated by A1 on A5, which is expressed as the change of the accumulated heat value of A5.

[0162] (1) The first cutting (vertical cutting), such as Figure 7 shown.

[0163] A14 stack = (α1×A44+α2×A43+α3×A42+α4×A41)×edge diffusion coefficient β;

[0164] A13 stack = α5 × A44 stack;

[0165] A12 stack = α6 × A44 stack;

[0166] A11 stack = α7 × A44 stack;

[0167] A1_col stack (the fourth heat-affected image) = stacks A11 to A14 are stitched together.

[0168] In the above expression, A14 is the heat impact data of A1 on A51, A13 is the heat impact data of A1 on A52, A12 is the heat impact data of A1 on A53, and A11 is the heat impact data of A1 on A54.

[0169] (2) The second segmentation (horizontal segmentation), such as Figure 8 (The calculation method of A2 and A8 is the same as that of the horizontal cutting, and the calculation method of A2 and A8 is not shown).

[0170] A110 stack = (α1×A110+α2×A19+α3×A18+α4×A17+α5×A16+α6×A17)×edge diffusion coefficient β;

[0171] A19 stack = α7 × A110 stack;

[0172] A18 stack = α8 × A110 stack;

[0173] A17 stack = α9 × A110 stack;

[0174] A16 stack = α10 × A110 stack;

[0175] A15 stack = α11 × A110 stack;

[0176] A1_row stack (fifth heat-affected image) = A15 stack to A110 stack are spliced.

[0177] In the above expressions, A110 stack is the heat impact data of A1 on A55, A1 stack is the heat impact data of A19 on A56, ..., A15 stack is the heat impact data of A1 on A550.

[0178] (3) A1 stack (sixth heat-affected image) = (A1_col stack + A1_row stack) / 2.

[0179] A1 is at the upper left corner of A5, so A1 has both vertical and horizontal influences on A5. Therefore, A1 can be divided twice to calculate the vertical influence and horizontal influence respectively. The calculation method is the same as that of calculating the influence of A4 on A5. Finally, the vertical influence and the horizontal influence are summed and averaged to get the influence of A1 on A5.

[0180] According to the above method, the third heat impact images A4 and A6, the seventh heat impact images A2 and A8, and the sixth heat impact images A1, A3, A7, and A9 can be obtained respectively. The plurality of second space heat impact images include A2, A4, A6, A8, A1, A3, A7, and A9.

[0181] Through the above calculation process, the thermal influence of the surrounding 8 unit images (A2, A4, A6, A8, A1, A3, A7, A9) on the central unit image A5 can be obtained, and then superimposed together to obtain the surrounding thermal influence of A5, that is, the surrounding heat accumulation of A5 (the thermal influence data of the surrounding unit images on the central unit image).

[0182] The heat accumulation around A5 (the sum of multiple second spatial heat impact images) = A2 stack + A4 stack + A6 stack + A8 stack + A1 stack + A3 stack + A7 stack + A9 stack.

[0183] Secondly, determine the heat impact data of the central unit image on itself, and obtain the first space heat impact image. The details are as follows:

[0184] A5 self-heat accumulation (first space heat impact image) = A5 × A5 weight image (weight coefficients are all 1).

[0185] The weight coefficients are all 1, and the A5×A5 weighted image is equivalent to not doing any calculations because everything is multiplied by 1.

[0186] Finally, if Fig.10 As shown, the heat accumulation of A5 itself and the heat accumulation around A5 are added to obtain the unit space heat impact image of A5. That is, the unit space heat impact image of A5 = the heat accumulation of A5 itself + the heat accumulation around A5.

[0187] Next, all the spliced ​​display panels (unit screens) in the spliced ​​display device are subjected to the same method, and the unit space heat impact image of each unit image, that is, the unit space heat impact image of Ai (i≥1) can be obtained.

[0188] Based on the obtained unit spatial heat impact images of Ai (i≥1), they are spliced ​​to obtain the spatial heat impact image corresponding to the entire screen of the spliced ​​display device.

[0189] It should be noted that if the unit image A1 is located in the upper left corner of the entire screen image, first, determine the heat impact of the surrounding unit images A2, A4, and A5 on A1, and then superimpose them together to obtain the surrounding heat impact of A1, that is, the surrounding heat accumulation of A1 (the heat impact data of the surrounding unit images on the central unit image)

[0190] A1 surrounding heat accumulation (addition of multiple second space heat impact images) = A2 stack + A4 stack + A5 stack; (calculation method is the same as above)

[0191] Secondly, determine the heat impact data of the unit image A1 on itself, and obtain the first space heat impact image. The details are as follows:

[0192] A1 self-heat accumulation (first space heat impact image) = A1 × A1 weight image (weight coefficients are all 1).

[0193] Finally, the unit space heat of A1 affects the image = A1's own heat accumulation + A1's surrounding heat accumulation.

[0194] Similarly, if the unit image A7 is located at the lower left corner of the entire screen image, A3 is located at the upper right corner of the entire screen image, and A9 is located at the lower right corner of the entire screen image, the calculation method is the same as above.

[0195] In other embodiments, Fig.10 As shown in FIG. 1 , in the construction of the screen characteristic model, the unit image segmentation scheme can be a common vertical and horizontal segmentation, that is, block segmentation. When calculating the influence, a small block in A4 is taken to calculate its influence on all small blocks in A5, and the influence of all small blocks in A4 on all small blocks in A5 is calculated by analogy. After superposition, it is the influence of A4 on A5, as shown in FIG. Fig.10 shown.

[0196] The number of unit image segments can be flexible and varied. The more segments there are, the more accurate the calculation results will be, but the amount of calculation will also be greater. In actual use, the algorithm can be flexibly configured based on the balance between effect and speed.

[0197] In some embodiments, the peripheral unit images and the central unit image are respectively cut into N equal image blocks longitudinally, or cut into N equal image blocks transversely, or cut into N equal image blocks longitudinally and transversely, including:

[0198] Adding the surrounding unit image and the mean image of the surrounding unit images to obtain a first image;

[0199] Multiply the first image by the weight image of the surrounding unit images to obtain a second image;

[0200] Cut the second image into N equal image blocks longitudinally, or cut it into N equal image blocks transversely, or cut it into N equal image blocks longitudinally and transversely;

[0201] And, determining the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second space heat impact images, including:

[0202] Add N equal image blocks of surrounding image units to obtain an equal image block;

[0203] Mirror an image and flip it to get another image block.

[0204] Multiply another equal image block by different coefficients to obtain heat impact data of the N equal image blocks of the surrounding image units on the N equal image blocks of the central unit image corresponding to the N equal image blocks;

[0205] The heat impact data of N equal parts are spliced ​​to obtain the heat impact data of the surrounding unit images on the central unit image;

[0206] Based on the heat impact data of the surrounding unit images on the central unit image, a second spatial heat impact image is obtained.

[0207] For example, Fig.11 shown.

[0208] Add the surrounding unit image A4 and the mean image (A4_mean) of the surrounding unit image A4 to obtain a first image;

[0209] Multiply the first image by the weight image (A4_weight) of the surrounding unit image A4 to obtain a second image;

[0210] The second image is divided into four equal image blocks vertically;

[0211] Add the four equal image blocks of the surrounding image unit A4 to obtain an equal image block;

[0212] Mirror an image and flip it to get another image block.

[0213] Multiply another equal image block by different coefficients to obtain heat impact data of the four equal image blocks of the surrounding image units on the four equal image blocks of the central unit image corresponding to the four equal image blocks; (as shown in the above calculation formula example);

[0214] The heat impact data of the four equal parts are spliced ​​together to obtain the heat impact data of the surrounding unit image A4 on the central unit image A5;

[0215] Based on the heat impact data of the surrounding unit image A4 on the central unit image A5, a second space heat impact image is obtained.

[0216] In some embodiments, temporal accumulation is performed on the spatial heat impact image to obtain a temporal heat accumulation image, including:

[0217] Construct a thermal grayscale lookup table;

[0218] When the grayscale value of the pixel of the first grayscale image is greater than or equal to the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is added to the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame, and the heat accumulation value of the pixel of the previous n frames of image is obtained as the time heat accumulation image;

[0219] When the grayscale value of a pixel of the first grayscale image is less than the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is subtracted from the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame to obtain the heat accumulation value of the pixel of the previous n frames of image as the time heat accumulation image.

[0220] Specifically, the position of a pixel in the first grayscale image is selected;

[0221] According to the current accumulated heat value of the pixel, if the current accumulated heat value of the pixel cannot be found in the heat / grayscale lookup table, find the last value less than the heat value from top to bottom in the first column of the heat / grayscale lookup table, and the grayscale value in the heat / grayscale lookup table corresponding to the value is the value to be compared.

[0222] For example, the current accumulated heat value of a pixel is 9. In the heat / grayscale lookup table, the grayscale value corresponding to 8.7 is 235, and the grayscale value corresponding to 9.2 is 244.

[0223] If the heat value of the pixel point in the first grayscale image of the current frame is 9, the corresponding grayscale value is 248, and 248 (the grayscale value in the first grayscale image of the current frame heat value 9) is greater than 235 (the grayscale value G corresponding to the lookup table 8.7), the heat increases.

[0224] If the heat value of the pixel point in the first grayscale image of the current frame is 9, the corresponding grayscale value is 225, 225 (the grayscale value in the first grayscale image of the current frame heat value 9) is less than 235 (the grayscale value G corresponding to the lookup table 8.7), and the heat is reduced.

[0225] If the currently accumulated heat value of the pixel can be found in the heat / grayscale lookup table, the grayscale value in the heat / grayscale lookup table corresponding to the value is the value to be compared.

[0226] For example, if the heat value of the pixel in the first grayscale image of the current frame is 8.7, the corresponding grayscale value is 248, and 248 is greater than 235 (the grayscale value G corresponding to 8.7 in the lookup table), the heat increases.

[0227] For example, if the heat value of the pixel in the first grayscale image of the current frame is 8.7, the corresponding grayscale value is 220, and 220 is less than 235 (the grayscale value G corresponding to 8.7 in the lookup table), the heat is reduced.

[0228] Specifically, Fig.12 The flowchart of the entire control method is shown.

[0229] Assuming that the accumulated heat of the entire screen before powering on is 0, construct an initial heat matrix A_T0, and assign all values ​​to 0 (the size of the heat matrix is ​​consistent with the size of the entire screen of the spliced ​​display device);

[0230] Then, a thermal grayscale lookup table is constructed;

[0231] When I 2_ij ≥G, A_T n_ij =A_T n-1_ij +αI 4_ij ;

[0232] When I 2_ij When A_T < G n_ij =A_T n-1_ij -αI 4_ij ;

[0233] A_T n_ij Represents the heat accumulation value of the pixel [ij] in the previous n frames (i.e., the heat accumulation value accumulates the heat of the previous n frames);

[0234] A_T n-1_ij Represents the heat accumulation value of the pixel [ij] in the previous n-1 frames (i.e., the heat accumulation value accumulates the heat of the previous n-1 frames);

[0235] αI 4_ij Indicates the contribution value of the pixel [ij] of the current frame to the heat (i.e. the instantaneous heat value of the pixel in the current frame);

[0236] I 2_ij represents the gray value of the pixel [ij] in the first gray image I2 (the gray value is used to compare with the gray value G in the heat / gray lookup table);

[0237] α represents the weight coefficient of the contribution value (i.e., the weight coefficient representing the heat accumulated by the pixel [ij] at the position of the i-th row and the j-th column of the spliced ​​display device screen);

[0238] G represents the gray value in the lookup table that is to be compared with the gray value of the pixel [ij] in the first gray image I2.

[0239] In some embodiments, constructing a thermal grayscale lookup table includes:

[0240] Determine a correspondence between a plurality of grayscale values ​​and a plurality of stable heat values, wherein the stable heat value is the heat of the spliced ​​display device when an image with the same grayscale value is continuously displayed on the spliced ​​display device in full screen for a time period that reaches a threshold value;

[0241] A corresponding relationship between at least one grayscale value within the designed calorific value range and at least one stable calorific value is selected as a calorific grayscale lookup table.

[0242] Specifically, all grayscales from 0 to 255 are tested periodically, and the heat value of the spliced ​​display device corresponding to a grayscale value of the image is obtained;

[0243] Select the grayscale values ​​corresponding to the heat values ​​within the heat value range and construct a heat grayscale lookup table; the heat value range is not less than 0 and not greater than 10.7;

[0244] Among them, a test cycle includes:

[0245] The same image is continuously displayed on the spliced ​​display device, and the grayscale of the image is a grayscale value;

[0246] After displaying the same image for a first period of time, the heat of the spliced ​​display device is maintained at a fixed value, and a heat value of the spliced ​​display device corresponding to a grayscale value of the image is tested and obtained.

[0247] Specifically, you can select a certain grayscale and light up the screen for a long time to test the stable heat value of the screen.

[0248] In the actual test process, after the same image is displayed on the screen of the MiniLED splicing display device for more than 40 minutes, the screen temperature will stabilize to a fixed value and no longer change. This temperature stability value is the heat value after stabilization under the grayscale.

[0249] Through multiple attempts and measurements, the grayscale values ​​corresponding to the heat values ​​from 0 to 10.7 were found, and a heat / grayscale lookup table was constructed.

[0250] Table 1: Thermal grayscale lookup table

[0251]

[0252]

[0253] The embodiment of the present application proposes a method for estimating the heat of a MiniLED splicing display device based on grayscale value statistics. The grayscale value of each pixel in each frame of the image is accumulated to the current temperature of the screen to generate a contribution value, which may refer to the increase or decrease in heat. This contribution value is accumulated in the time dimension to form the final screen heat estimate. The solution of the present application is used to estimate the heat of a MiniLED splicing display device without adding any temperature sensing hardware, and the temperature heat estimation of a MiniLED splicing display device is achieved without increasing any cost. A heat accumulation image is formed by the estimated heat estimate value of the MiniLED splicing display device, and then the heat accumulation image is regionally segmented and compensated to form a compensated image.

[0254] The effect diagram of the control method of the splicing display device provided by the embodiment of the present application is as follows: Fig.14 and Fig.15 shown.

[0255] Based on the same inventive concept, Fig.13 As shown, an embodiment of the present application provides a control device for a spliced ​​display device, comprising:

[0256] A spatial heat module 10 is used to obtain a first grayscale image and determine a spatial heat impact image of the spliced ​​display device based on the first grayscale image, wherein the first grayscale image is obtained by grayscale processing based on the original image;

[0257] The time heat module 20 is used to perform time accumulation on the spatial heat impact image to obtain a time heat accumulation image;

[0258] A second grayscale module 30, used for mapping the time heat accumulation image into a second grayscale image;

[0259] The compensation module 40 is used to subtract the second grayscale image from the R channel component in the original image to obtain a compensated image.

[0260] The control device of the spliced ​​display device of this embodiment can execute any control method of the spliced ​​display device provided in the embodiments of the present application, and the implementation principles are similar and will not be repeated here.

[0261] Based on the same inventive concept, an embodiment of the present application provides a spliced ​​display device, including:

[0262] Spliced ​​display panel; the spliced ​​display panel includes a plurality of display panels spliced ​​together;

[0263] Memory;

[0264] A processor, electrically connected to the memory and the spliced ​​display panel;

[0265] The memory stores a computer program, and the computer program is executed by the processor to implement the control method of the spliced ​​display device provided in any of the above embodiments.

[0266] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, which is used to store computer instructions. When the computer instructions are executed on a computer, the computer can execute the control method of the spliced ​​display device provided in any of the above embodiments.

[0267] By applying the embodiments of the present application, at least the following beneficial effects can be achieved:

[0268] The control method of the spliced ​​display device provided in the embodiment of the present application determines the spatial heat impact image of the spliced ​​display device based on the first grayscale image in the spatial dimension, the first grayscale image is obtained by grayscale processing based on the RGB image, and in the time dimension, the spatial heat impact image is temporally accumulated to obtain a time heat accumulation image, and then the time heat accumulation image is mapped to a second grayscale image, the second grayscale image is a compensation image, that is, the grayscale value that needs to be compensated; then, the R channel component in the RGB image is subtracted from the second grayscale image to obtain a compensated image.

[0269] Since the luminous efficiency of the light-emitting unit is reduced in the area of ​​the screen where more heat is accumulated, and the luminous efficiency of the light-emitting unit is still high in the area where less heat is accumulated, afterimages are likely to occur in the area where more heat is accumulated and the luminous efficiency of the light-emitting unit is low. Therefore, the embodiment of the present application obtains a heat accumulation image in the spatial dimension and the time dimension, and maps the heat accumulation image into a grayscale image, that is, a compensation image. It is necessary to lower the image grayscale value in the area with high luminous efficiency, and subtract the second grayscale image from the R channel component of the RGB image to make the grayscale value smaller, thereby reducing the afterimage, so that the screen display is uniform when the entire screen switches to the same grayscale display, thereby improving the display effect and user experience.

[0270] Moreover, according to the background description, the luminous efficiency of MiniLED lamps is affected by temperature. When heat accumulation reaches a certain level, the temperature will rise, causing the luminous efficiency of MiniLED lamps to decrease. After the MiniLED screen lights up a certain pattern for a long time (the pattern is non-white and the background is all white), the temperature in the pattern area is low (less heat accumulation), and the temperature in the background area is high (more heat accumulation). The luminous efficiency of MiniLED lamps in places with high temperatures becomes lower, and the luminous efficiency of MiniLED lamps in places with low temperatures is still high. In order to make the picture display more uniform, the image grayscale value of the area with high luminous efficiency needs to be lowered a little. The R channel component of the RGB image can be subtracted from the second grayscale image to make the grayscale value smaller, thereby reducing the afterimage, so that the screen display is uniform when the entire screen switches to the same grayscale display, improving the display effect and user experience.

[0271] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, altered, combined, or deleted. Further, other steps, measures, and schemes in the various operations, methods, and processes discussed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted. Further, the steps, measures, and schemes in the prior art that are similar to those disclosed in this application may also be alternated, altered, rearranged, decomposed, combined, or deleted.

[0272] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0273] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0274] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0275] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0276] It should be understood that, although the steps in the flowchart of the accompanying drawings are displayed in sequence as indicated by the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least a part of the steps in the flowchart of the accompanying drawings may include multiple sub-steps or multiple stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and their execution order is not necessarily sequential, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0277] The above description is only a partial implementation method of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A control method for a spliced ​​display device, characterized in that: include: Acquire a first grayscale image, and determine a spatial heat impact image of the spliced ​​display device based on the first grayscale image, wherein the first grayscale image is obtained by grayscale processing of the original image; Performing temporal accumulation on the spatial heat impact image to obtain a temporal heat accumulation image; Mapping the time-heat accumulation image into a second grayscale image; Subtract the second grayscale image from the R channel component in the original image to obtain a compensated image; The step of performing temporal accumulation on the spatial heat impact image to obtain a temporal heat accumulation image includes: Construct a thermal grayscale lookup table; When the grayscale value of the pixel of the first grayscale image is greater than or equal to the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is added to the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame, and the heat accumulation value of the pixel of the previous n frames of image is obtained as the time heat accumulation image; When the grayscale value of the pixel of the first grayscale image is less than the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is subtracted from the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame to obtain the heat accumulation value of the pixel of the previous n frames of image as the temporal heat accumulation image.

2. The control method of the splicing display device according to claim 1, characterized in that: In the spatial dimension, based on the first grayscale image, determining a spatial heat impact image of the spliced ​​display device includes: Simulating heat diffusion information of the pattern in the first grayscale image to generate a pattern edge diffusion image; Based on the pattern edge diffusion image, a spatial heat impact image of the spliced ​​display device is determined.

3. The control method of the splicing display device according to claim 2, characterized in that: The simulating the heat diffusion information of the pattern in the first grayscale image to generate a pattern edge diffusion image includes: A first area outside the edge of the pattern in the first grayscale image is reduced by a grayscale value, and a second area within the edge of the pattern in the first grayscale image is increased by a grayscale value, the increased grayscale value is equal to the reduced grayscale value, to obtain a pattern edge diffusion image; or a first area outside the edge of the pattern in the first grayscale image is increased by a grayscale value, and a second area within the edge of the pattern in the first grayscale image is reduced by a grayscale value, the increased grayscale value is equal to the reduced grayscale value, to obtain a pattern edge diffusion image.

4. The control method of the splicing display device according to claim 2, characterized in that: The spliced ​​display device comprises a spliced ​​display panel, and the spliced ​​display panel comprises at least two display panels spliced ​​together; And, determining the spatial heat impact image of the spliced ​​display device based on the pattern edge diffusion image includes: Slicing the pattern edge diffusion image which is the same size as the spliced ​​display panel to obtain at least two unit images which are the same size as the display panel; Determining a unit space heat impact image for each unit image; Based on each unit spatial thermal impact image, a spatial thermal impact image of the tiled display panel is determined.

5. The control method of the splicing display device according to claim 4, characterized in that: The determining of the unit space heat impact image of each unit image comprises: Determine the heat impact data of the central unit image on itself, and obtain a first space heat impact image; Determine the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second space heat impact images; the surrounding unit images are located around the central unit image; The first space heat impact image and a plurality of the second space heat impact images are added together to obtain the unit space heat impact image.

6. The control method of the splicing display device according to claim 5, characterized in that: The determining of the heat impact data of the surrounding unit images on the central unit image to obtain a plurality of second space heat impact images includes: The surrounding unit image and the central unit image are cut into N equal image blocks longitudinally and / or cut into N equal image blocks transversely, or cut into N equal image blocks longitudinally and transversely, and the heat impact data of the surrounding unit images on the central unit image are determined to obtain a plurality of second spatial heat impact images.

7. The control method of the splicing display device according to claim 6, characterized in that: The method of dividing the surrounding unit images and the central unit image into N equal image blocks longitudinally and / or N equal image blocks transversely, determining the heat impact data of the surrounding unit images on the central unit image, and obtaining a plurality of second space heat impact images includes: The surrounding unit image that is directly adjacent to the central unit image in the horizontal direction is a first surrounding unit image. The first surrounding unit image and the central unit image are respectively divided into N1 equal image blocks in the vertical direction, and the heat impact data of the first surrounding unit image on the central unit image is determined to obtain a third heat impact image. The plurality of second space heat impact images include a plurality of the third heat impact images. The surrounding unit image directly adjacent to the central unit image vertically is the third surrounding unit image. The third surrounding unit image and the central unit image are horizontally divided into N2 equal image blocks respectively, and the heat impact data of the third surrounding unit image on the central unit image is determined to obtain the seventh heat impact image; the multiple second space heat impact images include multiple seventh heat impact images.

8. The control method of the splicing display device according to claim 6, characterized in that: The method of dividing the surrounding unit image and the central unit image into N equal image blocks longitudinally and / or N equal image blocks transversely, determining the heat impact data of the surrounding unit images on the central unit image, and obtaining a plurality of second spatial heat impact images includes: The surrounding unit image that is not directly adjacent to the central unit image is a second surrounding unit image. The second surrounding unit image and the central unit image are respectively divided longitudinally into N1 equal image blocks, and the longitudinal heat impact data of the second surrounding unit image on the central unit image is determined to obtain a fourth heat impact image; the second surrounding unit image and the central unit image are respectively divided transversely into N2 equal image blocks, and the transverse heat impact data of the second surrounding unit image on the central unit image is determined to obtain a fifth heat impact image; the fourth heat impact image and the fifth heat impact image are added and averaged to obtain a sixth heat impact image; the multiple second space heat impact images include multiple sixth heat impact images.

9. The control method of the splicing display device according to claim 1, characterized in that: The construction of the thermal grayscale lookup table comprises: Determine a correspondence between a plurality of grayscale values ​​and a plurality of stable heat values, wherein the stable heat value is the heat of the spliced ​​display device when an image with the same grayscale value is continuously displayed on the spliced ​​display device in full screen for a time period that reaches a threshold value; A corresponding relationship between at least one grayscale value within the designed calorific value range and at least one stable calorific value is selected as a calorific grayscale lookup table.

10. The control method of the splicing display device according to claim 1, characterized in that: The original image includes an RGB image.

11. A control device for a spliced ​​display device, characterized in that: include: A spatial heat module, used to obtain a first grayscale image, and determine a spatial heat impact image of the spliced ​​display device based on the first grayscale image, wherein the first grayscale image is obtained by grayscale processing based on the original image; A time heat module, used for performing time accumulation on the spatial heat impact image to obtain a time heat accumulation image; A second grayscale module, used for mapping the time-heat accumulation image into a second grayscale image; A compensation module, used for subtracting the second grayscale image from the R channel component in the original image to obtain a compensated image; The time-to-heat module is specifically used to construct a heat grayscale lookup table; When the grayscale value of the pixel of the first grayscale image is greater than or equal to the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is added to the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame, and the heat accumulation value of the pixel of the previous n frames of image is obtained as the time heat accumulation image; When the grayscale value of the pixel of the first grayscale image is less than the grayscale value in the lookup table, the heat accumulation value of the pixel of the previous n-1 frames of image is subtracted from the instantaneous heat value of the pixel of the spatial heat impact image of the pixel of the current frame to obtain the heat accumulation value of the pixel of the previous n frames of image as the temporal heat accumulation image.

12. A splicing display device, characterized in that: include: A spliced ​​display panel, the spliced ​​display panel comprising at least two display panels spliced ​​together; Memory; A processor, electrically connected to the memory and the spliced ​​display panel; The memory stores a computer program, and the computer program is executed by the processor to implement the control method of the spliced ​​display device according to any one of claims 1 to 10.

13. A computer-readable storage medium, characterized in that: The computer storage medium is used to store computer instructions, and when the computer storage medium is run on a computer, the computer can execute the control method of a spliced ​​display device as described in any one of claims 1 to 10.

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