Display device and voltage drop compensation method
By obtaining the input load and current intensity of the display screen and calculating the equivalent grayscale of the pixel unit for compensation, the brightness unevenness problem caused by the driving circuit resistance is solved and the brightness consistency under different loads is achieved.
Patent Information
- Application Number
- PCT/CN2024/084677
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-29
- Publication Date
- 2025-10-02
Smart Images
Figure CN2024084677_02102025_PF_FP_ABST
Abstract
Description
Display device and voltage drop compensation method Technical Field
[0001] The present disclosure relates to the technical field of image data processing, and in particular to a display device and a voltage drop compensation method. Background Art
[0002] Voltage drop is a problem that causes uneven brightness on the screen due to resistance in the driver circuit. This uneven brightness on a display comes from an inherent property of the screen itself: uneven voltage due to resistance in the driver circuit. The pixels in a display are connected via a driver circuit. The inherent resistance in the driver circuit causes voltage division, resulting in inconsistent driving voltage for each pixel, leading to inconsistent luminous intensity and, consequently, uneven brightness on the screen.
[0003] For a display screen, the load size of the display screen is related to the pixel value and image size of the input image. Due to the voltage division phenomenon, the display screen with different loads (OPR, On Pixel Ratio) will have brightness differences.
[0004] Summary of the Invention
[0005] The present disclosure provides a display device and a voltage drop compensation method for compensating for brightness differences caused by different global loads, thereby achieving brightness consistency under different loads.
[0006] In a first aspect, an embodiment of the present disclosure provides a display device, the display device including a display screen and a control circuit, wherein:
[0007] The display screen is configured to display content;
[0008] The control circuit includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and perform the following steps:
[0009] Obtaining the current image, determining the input load of the display screen when the current image is displayed, and determining the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0010] Determine a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of the pixel unit under the input load;
[0011] The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
[0012] In a second aspect, an embodiment of the present disclosure provides a display device, the display device including a display screen and a control circuit, wherein:
[0013] The display screen is configured to display content;
[0014] The control circuit includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and perform the following steps:
[0015] Obtain the current image, estimate the current current intensity of the display screen driver circuit when the current image is displayed, and determine the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0016] Determining a first equivalent grayscale corresponding to the current current intensity and the minimum brightness of the grayscale of each channel of the pixel unit according to the relationship between the current intensity, the grayscale and the brightness, wherein the grayscale represents a grayscale with the same grayscale value of each channel;
[0017] The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
[0018] In a third aspect, an embodiment of the present disclosure provides a voltage drop compensation method, comprising:
[0019] Obtaining the current image, determining the input load of the display screen when the current image is displayed, and determining the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0020] Determine a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of the pixel unit under the input load;
[0021] The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
[0022] In a fourth aspect, an embodiment of the present disclosure further provides an electronic device, including a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and perform the following steps:
[0023] Obtain the current image, estimate the current current intensity of the display screen driver circuit when the current image is displayed, and determine the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0024] Determining a first equivalent grayscale corresponding to the current current intensity and the minimum brightness of the grayscale of each channel of the pixel unit according to the relationship between the current intensity, the grayscale and the brightness, wherein the grayscale represents a grayscale with the same grayscale value of each channel;
[0025] The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
[0026] In a fifth aspect, an embodiment of the present disclosure further provides a voltage drop compensation device, comprising:
[0027] The intensity brightness estimation module is used to obtain the current image, determine the input load of the display screen when the current image is displayed, and determine the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0028] an equivalent grayscale determining module, configured to determine, under the condition of the input load, a first equivalent grayscale corresponding to the lowest brightness of the grayscales of each channel of the pixel unit;
[0029] The grayscale compensation display module is used to compensate the grayscale of each channel of the pixel unit according to the first equivalent grayscale corresponding to the grayscale of each channel of the pixel unit, and display the compensated current image.
[0030] In a sixth aspect, an embodiment of the present disclosure further provides a computer storage medium on which a computer program is stored, which, when executed by a processor, is used to implement the steps of the method described in any one of the second aspects above.
[0031] In a seventh aspect, the present disclosure provides a computer program product, comprising: a computer program code, which, when executed on a computer, enables the computer to execute any one of the methods described in the second aspect.
[0032] These and other aspects of the present disclosure will become more readily apparent from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, 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 disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0034] FIG1 is a schematic diagram of an OLED circuit structure provided by an embodiment of the present disclosure;
[0035] FIG2 is a schematic diagram of local brightness non-uniformity provided by an embodiment of the present disclosure;
[0036] 3A-3C are schematic diagrams of brightness non-uniformity under different loads provided by an embodiment of the present disclosure;
[0037] FIG4 is a schematic diagram of a display device provided by an embodiment of the present disclosure;
[0038] FIG5 is a schematic diagram of a relationship between load and voltage drop provided by an embodiment of the present disclosure;
[0039] FIG6 is a schematic diagram of a test provided by an embodiment of the present disclosure;
[0040] 7A-7C are schematic diagrams of relationship curves between image area and brightness of each channel provided by an embodiment of the present disclosure;
[0041] 8A-8C are schematic diagrams showing the relationship between brightness and grayscale of an RGB channel grayscale image provided by an embodiment of the present disclosure;
[0042] 9A-9C are schematic diagrams of curves showing the relationship between brightness and current intensity of images of different grayscales in RGB channels provided by an embodiment of the present disclosure;
[0043] 10A-10C are schematic diagrams of a relationship curve between grayscale and minimum brightness of an RGB channel provided by an embodiment of the present disclosure;
[0044] FIG11 is a schematic diagram of a three-dimensional relationship among current intensity, grayscale, and brightness provided by an embodiment of the present disclosure;
[0045] FIG12A is a schematic diagram of a curve showing the relationship between the brightness and current intensity of an RGB channel grayscale image provided by an embodiment of the present disclosure;
[0046] FIG12B is a schematic diagram of a curve showing the relationship between the brightness and current intensity of a grayscale image provided by an embodiment of the present disclosure;
[0047] FIG13A is a schematic diagram of a relationship curve between grayscale and minimum brightness of an RGB channel provided by an embodiment of the present disclosure;
[0048] FIG13B is a schematic diagram of a relationship curve between grayscale and minimum brightness provided by an embodiment of the present disclosure;
[0049] FIG14 is a flowchart of a voltage drop compensation algorithm according to an embodiment of the present disclosure;
[0050] FIG15 is a flowchart of a specific implementation of voltage drop compensation provided by an embodiment of the present disclosure;
[0051] 16A-16B are comparative diagrams of compensation effects provided by an embodiment of the present disclosure;
[0052] FIG17 is a schematic diagram of a display device provided by an embodiment of the present disclosure;
[0053] FIG18 is a flowchart of an implementation of a voltage drop compensation method provided in an embodiment of the present disclosure;
[0054] FIG19 is a schematic diagram of an electronic device provided by an embodiment of the present disclosure;
[0055] FIG20 is a schematic diagram of a voltage drop compensation device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION
[0056] To make the objectives, technical solutions, and advantages of the present disclosure more clear, the present disclosure will be further described in detail below with reference to the accompanying drawings. It is apparent that the embodiments described are only a portion of the embodiments of the present disclosure, rather than all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative effort are intended to fall within the scope of protection of the present disclosure.
[0057] In the embodiments of the present disclosure, the term "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.
[0058] The application scenarios described in the embodiments of the present disclosure are intended to more clearly illustrate the technical solutions of the embodiments of the present disclosure and do not constitute a limitation on the technical solutions provided by the embodiments of the present disclosure. Persons skilled in the art will appreciate that, as new application scenarios emerge, the technical solutions provided by the embodiments of the present disclosure will also be applicable to similar technical problems. In the description of the present disclosure, unless otherwise specified, "multiple" means two or more.
[0059] Before introducing the display device and the voltage drop compensation method provided by the embodiments of the present disclosure, for ease of understanding, the technical background of the embodiments of the present disclosure is first introduced in detail below.
[0060] Voltage drop is a problem of uneven screen display brightness caused by the resistance of the driving circuit. The uneven display brightness of the display screen comes from the inherent properties of the screen itself, that is, the uneven voltage caused by the resistance of the driving circuit. Taking the OLED (Organic Light-Emitting Diode, organic laser display, organic light-emitting semiconductor) screen as an example, as shown in Figure 1, this embodiment provides a schematic diagram of an OLED circuit structure, where a grid intersection is a light-emitting pixel (OLED), ELVDD is the starting point of the driving circuit, and ELVSS is the end point of the driving circuit. The light-emitting pixels are connected through the driving circuit. The resistance of the driving circuit itself causes voltage division, and the driving voltage obtained by each light-emitting pixel is inconsistent, resulting in inconsistent luminous intensity and uneven screen brightness. Generally speaking, the closer to the starting point of the driving circuit, the smaller the voltage division and the higher the brightness.
[0061] There are two typical cases of voltage division: local brightness difference and global brightness difference under different load areas (OPR) (On Pixel Ratio). As shown in Figure 2, this embodiment provides a schematic diagram of local brightness non-uniformity. Local brightness difference mainly refers to the brightness difference between different areas of the screen. The figure tests the brightness of different areas, for example, the brightness of test area 01, area 02 and area 03 are: Lv 01 >LV 02 >Lv 03 , where Lv 01 Indicates the brightness of test area 01, Lv 02 Indicates the brightness of test area 02, Lv 03 represents the brightness of test area 03. As shown in Figures 3A-3B, this embodiment provides a schematic diagram of brightness nonuniformity under different loads. Different global loads can cause brightness differences in the displayed image. In Figure 3A, varying image loads lead to varying display brightness. In Figure 3B, as the image display area increases and the load increases, the displayed brightness decreases. Figure 3C shows a curve showing how brightness changes with load, showing that the greater the load, the darker the brightness.
[0062] The embodiment of the present disclosure focuses on compensating for the brightness difference caused by different global loads to achieve brightness consistency under different loads. The core idea of a display device and a voltage drop compensation method provided by this embodiment is to predetermine the three-dimensional relationship between load, grayscale and brightness, use grayscale as a reference, and use grayscale as the grayscale that the image ultimately needs to reach. Based on the actual load of the current image and the minimum brightness that the current image needs to display, combined with the three-dimensional relationship, the first equivalent grayscale of the image under the minimum brightness and actual load is determined, and the grayscale value of the image is compensated by using the first equivalent grayscale, so that images with different loads can at least reach the minimum brightness under the load corresponding to the current image when displayed, and to a certain extent, the brightness under different loads can at least be guaranteed to be the minimum brightness under the corresponding load. Therefore, it can solve the problem of difference in displayed brightness due to different loads to a certain extent.
[0063] It should be noted that the display devices in this embodiment include, but are not limited to, large-screen smart display devices (generally 50 inches or larger), mobile phones, tablets, computers, and other devices using liquid crystal displays. Display devices include, but are not limited to, liquid crystal displays (LCDs), organic electroluminescence displays (OLEDs), electronic ink displays, and other display screens. This embodiment does not impose excessive restrictions on the type of display screen of the display device.
[0064] The display screen of the display device in this embodiment includes but is not limited to OLED, mobile phone screen, car screen, NB (Normally Black) screen, etc., and this embodiment does not impose too many restrictions on this.
[0065] As shown in FIG4 , an embodiment of the present disclosure provides a display device, which includes a display screen 400 and a control circuit 401 , wherein:
[0066] The display screen 400 is configured to display content;
[0067] The control circuit 401 includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and perform the following steps:
[0068] Step a: acquiring a current image, determining an input load of the display screen when the current image is displayed, and determining the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0069] Optionally, in this embodiment, the image input to the display screen (including the current image and the test image, etc.) includes but is not limited to an RGB image, a RAW image, a YUV image, etc. This embodiment does not impose too many restrictions on the format of the image.
[0070] Optionally, the load in this embodiment refers to the load relative to the display screen. When an image is input to the display screen for display, the input image is the input load for the driving circuit of the display screen, and the input load changes with the size of the input image.
[0071] In this embodiment, the input load of the display screen when the current image is displayed is determined. One method is to estimate the input load corresponding to the current image and use the estimated value as the input load. Another method is to obtain the input load corresponding to the current image by calculating parameters that characterize the load. For example, the current intensity can be calculated and the current intensity of a pixel unit in the current image can be used as the input load corresponding to the pixel unit.
[0072] Optionally, the pixel unit in this embodiment may be a single pixel or a combination of adjacent pixels, which is not limited in this embodiment.
[0073] For a display screen, the load is related to the displayed image. The greater the load, the greater the current intensity. The load and current intensity are positively correlated. Therefore, this embodiment detects the magnitude of the input load corresponding to the current image through the current intensity.
[0074] Optionally, the current intensity in this embodiment includes the global current intensity for the display screen, and / or the average current intensity for a single pixel or a single pixel unit of the display screen, where global current intensity / display area=average current intensity for a single pixel.
[0075] Optionally, in this embodiment, the minimum brightness of the current image displayed is used to represent the minimum brightness that can be displayed under the input load corresponding to the current image. During implementation, the current image is input to the display screen, and the display screen can estimate the current current intensity of the current image and determine the minimum brightness of the current image.
[0076] Optionally, the minimum brightness in this embodiment includes the average minimum brightness of the entire image, or the minimum brightness of each pixel or each pixel unit in the image. For example, the minimum brightness of the current image includes the average minimum brightness displayed by the current image or the minimum brightness displayed by each pixel or each pixel unit in the current image.
[0077] Generally speaking, after any display screen is produced, the overall equivalent resistance Rs of the display screen is fixed. Rs is an unknown constant, as shown in FIG5 . This embodiment also provides a schematic diagram of the relationship between load and voltage drop. The global voltage drop of the display screen can be expressed as shown in formula (1): cV=Rs×Is (1);
[0078] In formula (1), cV is the overall voltage drop of the display, Rs is the overall equivalent resistance constant of the display, and Is is the global current intensity through the equivalent resistance Rs under the display input load. Therefore, the overall voltage drop is proportional to the global current intensity Is. The greater the input load, the greater the global current intensity Is, and the greater the overall voltage drop.
[0079] In some embodiments, the processor is specifically configured to estimate the current intensity by:
[0080] An input load corresponding to the current image is determined according to the grayscale of each channel of the pixel unit in the current image, the coefficient parameter of each channel, and the exponential parameter of each channel.
[0081] During implementation, the global current intensity corresponding to the currently input image is determined according to the grayscale value of each channel of the currently input image, the number of pixels, the coefficient parameters of each channel, and the exponential parameters of each channel.
[0082] In practice, the intensity of the global current (ie, the current size, in amperes A) is mainly related to the pixels of the image input on the screen, and the current intensity is estimated using the following formula.
[0083] Formula (2), Is represents the global current intensity, c represents any channel in the multi-channel image, taking RGB image as an example, c=0,1,2; cw c Indicates the coefficient parameters of channel c (such as R channel, G channel, B channel), which can be obtained through actual testing of DC power supply. c Indicates the exponential parameter of channel c, obtained through actual measurement. c (x,y) represents the grayscale value of channel c at each pixel position (x,y) of the input image (ranging from 0 to 1). h represents the height of the image (i.e., the number of pixels along the Y axis), and w represents the width of the image (i.e., the number of pixels along the X axis).
[0084] It should be noted that, in order to facilitate calculation, this embodiment normalizes the grayscale of each channel so that the grayscale value of each channel ranges from 0 to 1. As can be seen from the above formula, the global current intensity changes according to the exponential function as the grayscale value changes.
[0085] In some embodiments, the coefficient parameter is determined according to the ratio of the current intensity of each channel grayscale image to the total current intensity; the total current intensity is obtained by summing the current intensities corresponding to each channel grayscale image.
[0086] Optionally, the sum of the current intensities of the grayscale images of each channel is determined based on the current intensities displayed by the grayscale images of each channel; and the coefficient parameters corresponding to each channel are determined based on the ratio of the current intensity of the grayscale image of each channel to the sum.
[0087] For example, according to the global current intensity displayed by each channel grayscale image, the sum of the global current intensities of each channel grayscale image is determined; according to the ratio of the global current intensity of each channel grayscale image to the sum, the coefficient parameters corresponding to each channel are determined.
[0088] In practice, as shown in FIG6 , this embodiment provides a test schematic diagram. For any OLED screen, the red (R channel), green (G channel), and blue (B channel) images are fully lit. That is, the grayscale values of the R channel, G channel, and B channel are set to 1 (normalized value). A DC power supply is used to test and record the global current intensities I0, I1, and I2 under the red, green, and blue images, respectively. The coefficient parameters corresponding to the grayscale of each channel are as follows:
[0089] In formula (3), I0 represents the global current intensity of the R channel grayscale, I1 represents the global current intensity of the G channel grayscale, and I2 represents the global current intensity of the B channel grayscale; cw0 represents the coefficient parameter of the R channel grayscale, cw1 represents the coefficient parameter of the G channel grayscale, and cw2 represents the coefficient parameter of the B channel grayscale.
[0090] In some embodiments, the exponential parameter in this embodiment is determined based on the change law of brightness and grayscale of each channel in the relationship curve between grayscale and brightness of each channel, and the relationship curve between grayscale and brightness of each channel is determined based on the brightness corresponding to different grayscales in the grayscale image of each channel; wherein the brightness changes exponentially with the change of grayscale of each channel.
[0091] In practice, the index parameters are determined as follows:
[0092] For each channel grayscale image, the brightness of the grayscale image corresponding to different grayscales is determined to obtain a relationship curve between the grayscale and brightness of each channel, wherein the brightness changes exponentially with the change of the grayscale of each channel; based on the change law of the brightness and the grayscale of each channel in the relationship curve between the grayscale and brightness of each channel, the exponential parameters corresponding to each channel are determined.
[0093] In practice, to facilitate calculation, when obtaining the relationship curve between the grayscale and brightness of each channel, the grayscale value of each channel may be normalized, and the brightness value may also be normalized.
[0094] Optionally, taking an RGB image as an example, the channel grayscale images include an R channel grayscale image, a G channel grayscale image, and a B channel grayscale image. During implementation, for the R channel grayscale image, by traversing the grayscale, where the grayscale traversal range is 0 to 1, the brightness of the R channel grayscale image at different grayscales is detected, and a relationship curve between the R channel grayscale and brightness is obtained; similarly, for the G channel grayscale image, by traversing different grayscales, traversing the range of 0 to 1, the brightness of the G channel grayscale image at different grayscales is detected, and a relationship curve between the G channel grayscale and brightness is obtained; for the B channel grayscale image, by traversing different grayscales, traversing the range of 0 to 1, the brightness of the B channel grayscale image at different grayscales is detected, and a relationship curve between the B channel grayscale and brightness is obtained. Then, based on the relationship curve between the R channel grayscale and brightness, the exponential parameter of the R channel is determined; based on the relationship curve between the G channel grayscale and brightness, the exponential parameter of the G channel is determined; based on the relationship curve between the B channel grayscale and brightness, the exponential parameter of the B channel is determined.
[0095] In implementation, the exponential parameter γ cThe test can be indirectly achieved through brightness test. As shown in Figures 7A-7C, this embodiment provides a relationship curve between the image area and brightness of each channel, including the relationship curve between the image area and brightness of the R channel, the relationship curve between the image area and brightness of the G channel, and the relationship curve between the image area and brightness of the B channel. Among them, by fixing the grayscale of each channel of the image and changing the image area, the load size of the input display screen is changed. For example, the grayscale of the R channel, the grayscale of the G channel and the grayscale of the B channel are fixed to 1, and the image area displayed by the R channel grayscale image, the G channel grayscale image and the B channel grayscale image is changed, and the brightness of the screen test position under the corresponding image area is measured. Usually, the center area of the screen (the area where the center circle as shown in the figure is located) can be selected as the test position to test the display brightness of the screen. Finally, the relationship curve between the display area and brightness corresponding to each channel is obtained. It can be concluded that for any channel, the brightness decreases nearly linearly with the increase of the display area.
[0096] According to the calculation formula (2) of the global current intensity, the global current intensity is proportional to the area of the image. When the grayscale is fixed at 1 and the image area is the largest (the size of the image area is the same as the display area of the display screen), the global current intensity corresponding to the grayscale image of each channel is:
[0097] Global current intensity under the R channel grayscale image (red screen)
[0098] Global current intensity under the G channel grayscale image (green screen)
[0099] Global current intensity under the B channel grayscale image (blue screen)
[0100] Here, h represents the image height (i.e., the number of pixels along the Y axis), w represents the image width (i.e., the number of pixels along the X axis), Is0 represents the global current intensity of the R channel grayscale, Is1 represents the global current intensity of the G channel grayscale, and Is2 represents the global current intensity of the B channel grayscale; cw0 represents the coefficient parameter of the R channel grayscale, cw1 represents the coefficient parameter of the G channel grayscale, and cw2 represents the coefficient parameter of the B channel grayscale. It can be inferred that brightness has a linear relationship with the global current intensity Is.
[0101] In order to test the exponential parameter γ required to calculate the global current intensity Is c, it is necessary to traverse the different grayscales of each channel, that is, for each channel, traverse each channel grayscale in the range of 0 to 1. For example, taking the R channel as an example, traverse the R channel grayscale to obtain the corresponding R channel grayscale image, such as the R channel grayscale image with a grayscale of 0.1, the R channel grayscale image with a grayscale of 0.2, ..., the R channel grayscale image with a grayscale of 1. Similarly, traverse the G channel grayscale to obtain the G channel grayscale image; traverse the B channel grayscale to obtain the B channel grayscale image, and then test the brightness of the grayscale image displayed at different grayscales, and fit the relationship curve between the brightness and grayscale of each channel. The relationship curve between the brightness and grayscale conforms to y=a×x b Relationship, where x represents grayscale, y represents the normalized brightness value at grayscale x, and the exponential parameter γ of channel c is c =b.
[0102] As shown in Figures 8A to 8C, this embodiment provides a relationship between the brightness and grayscale of an RGB channel grayscale image, which respectively represents the relationship curve between the grayscale and brightness of the R channel, the relationship curve between the grayscale and brightness of the G channel, and the relationship curve between the grayscale and brightness of the B channel. The horizontal axis in the figure represents the grayscale, and the vertical axis represents the brightness. It should be noted that in this embodiment, when performing a brightness test, a test position of a display screen is usually fixed, and the brightness of the screen at the test position is tested to ensure the uniformity of the test conditions. The choice of the test position can be determined according to demand, for example, the center area of the screen can be selected, or other areas of the screen can be selected. This embodiment does not impose too many restrictions on this.
[0103] During implementation, tests have shown that the relationship between load and current intensity is similar to the relationship between grayscale and brightness. The current intensity changes exponentially with the change of load, and the brightness also changes exponentially with the change of grayscale. Moreover, the current intensity and brightness are linearly related, and the load is related to the grayscale. The greater the load, the greater the current intensity, and the greater the grayscale, the greater the brightness. Therefore, the exponential parameter of channel c can be inferred through the relationship between grayscale and brightness.
[0104] In practice, since the global current intensity Is is related to the display area and is a large value greater than 0, in order to facilitate modeling and operation, this embodiment converts the global current intensity and averages Is to each pixel or each pixel unit to obtain the average current intensity of the input load i s , taking a single pixel as an example, the calculation process of the average current intensity is shown in the following formula:
[0105] In formula (4), i sIs represents the average current intensity, that is, the current intensity corresponding to each pixel; Is represents the global current intensity, that is, the current intensity corresponding to the display screen; w represents the width of the display area of the display screen; h represents the height of the display area of the display screen.
[0106] Based on this, the load corresponding to each pixel of the input display can be estimated based on the average current intensity. The brightness of an image of any color is linearly related to the average current intensity: the higher the average current intensity, the lower the brightness.
[0107] Optionally, the current current intensity corresponding to the current image in this embodiment represents the current average current intensity corresponding to each pixel unit in the current image, or the current global current intensity corresponding to the entire current image.
[0108] It should be noted that the current intensity in this embodiment includes the global current intensity and / or the average current intensity. For ease of calculation, the average current intensity for each pixel unit may generally be used for calculation.
[0109] In some embodiments, the processor is specifically configured to determine the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image in the following manner:
[0110] According to the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image is determined.
[0111] In practice, a curve of the relationship between grayscale and minimum brightness under maximum load is obtained using a test image. Based on the grayscale of the current image, the minimum brightness of the current image at that grayscale is obtained. The test image can be adjusted to its maximum load by adjusting its display area.
[0112] In some embodiments, the processor is specifically configured to perform:
[0113] According to the relationship curve between the grayscale of each channel and the minimum brightness under the maximum load condition, the minimum brightness corresponding to the grayscale of each channel of the current image is determined; the minimum brightness corresponding to the grayscale of each channel is determined as the minimum brightness displayed by the current image.
[0114] During implementation, the relationship curve between the grayscale of the R channel and the minimum brightness under the maximum load, the relationship curve between the grayscale of the G channel and the minimum brightness, and the relationship curve between the grayscale of the B channel and the minimum brightness are obtained in advance. Then, the grayscale of each channel of the current image is substituted into the relationship curve between the grayscale and the minimum brightness of the corresponding channel to obtain the minimum brightness corresponding to the grayscale of each channel, which is used as the minimum brightness displayed by the current image.
[0115] It should be noted that the minimum brightness displayed by the current image in this embodiment is obtained based on the relationship curve between grayscale and minimum brightness under maximum load. For any pixel value (r, g, b) of the input image, the target brightness of the image is the minimum brightness under maximum load. Since the load and current intensity are proportional, the minimum brightness under maximum load can also be understood as the minimum brightness when the current intensity (such as the average current intensity) is maximum (for example, normalized to 1). Among them, when the minimum brightness is the minimum brightness when the average current intensity is maximum, at this time, since the average current intensity is for each pixel unit, the minimum brightness corresponds to the minimum brightness of each pixel unit; when the minimum brightness is the minimum brightness when the global current intensity is maximum, since the global current intensity is for the entire image, the minimum brightness corresponds to the average minimum brightness of the entire image. When the minimum brightness is the minimum brightness of each pixel unit and the current intensity is the average current intensity, the subsequent steps can be used to compensate the grayscale value of each pixel unit in the image.
[0116] In some embodiments, the relationship curve between the grayscale and the minimum brightness under the maximum load condition is obtained by fitting the minimum brightness corresponding to each grayscale under the maximum load; the minimum brightness corresponding to each grayscale under the maximum load is determined based on the functional relationship corresponding to each grayscale, and the functional relationship is determined based on the relationship between load and brightness.
[0117] During implementation, the load is adjusted to determine the brightness corresponding to different loads. A functional relationship is determined based on the relationship between load and brightness to obtain the functional relationship corresponding to each grayscale. Based on the functional relationship corresponding to each grayscale, the minimum brightness corresponding to each grayscale under the maximum load is determined. Based on the minimum brightness corresponding to each grayscale, a relationship curve between grayscale and minimum brightness is fitted.
[0118] Optionally, in the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the minimum brightness changes exponentially with the change of the grayscale.
[0119] During implementation, in order to obtain the minimum brightness of the three-channel RGB and grayscale under maximum load, the area of the input image can be adjusted to change the load size, thereby changing the current intensity, and obtaining a relationship curve of how the brightness of different grayscales of the RGB channels changes with the current intensity of the input load. When the load is maximum, the current intensity is maximum. Based on the brightness-current intensity relationship curve of different grayscales, the minimum brightness of each grayscale under maximum current intensity is obtained, and then a relationship curve between the minimum brightness and the grayscale is fitted. As shown in Figures 9A-9C, this embodiment provides a relationship curve between the brightness and current intensity of different grayscale images of the RGB channels, which respectively represent the relationship curve between the brightness and current intensity under different grayscale images of the R channel, the relationship curve between the brightness and current intensity under different grayscale images of the G channel, and the relationship curve between the brightness and current intensity under different grayscale images of the B channel. The horizontal axis in the figure represents the current intensity, and the vertical axis represents the brightness.
[0120] After obtaining the brightness-current intensity curves for different grayscales of each channel, a curve for the relationship between the minimum brightness and grayscale of each channel is fitted based on the minimum brightness of each grayscale at maximum current intensity. As shown in Figures 10A-10C, this embodiment provides a curve for the relationship between grayscale and minimum brightness of RGB channels, including a curve for the relationship between grayscale and minimum brightness of the R channel, a curve for the relationship between grayscale and minimum brightness of the G channel, and a curve for the relationship between grayscale and minimum brightness of the B channel. The horizontal axis in the figure represents grayscale, and the vertical axis represents brightness.
[0121] In practice, for an input pixel (r, g, b), the grayscale-minimum brightness curve for each channel can be used to calculate the minimum brightness of channel R as lv(r), the minimum brightness of channel G as Lv(g), and the minimum brightness of channel B as Lv(b). The minimum brightness of each channel obtained at this time is the target brightness to be displayed for the current image. Here, r represents the grayscale value of channel R, g represents the grayscale value of channel G, and b represents the grayscale value of channel B.
[0122] Step b: determining a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of the pixel unit under the input load;
[0123] Optionally, based on the relationship between load, grayscale and brightness, a first equivalent grayscale corresponding to the input load and the lowest brightness of the grayscale of each channel of the pixel unit is determined, wherein the grayscale represents a grayscale with the same grayscale value of each channel.
[0124] Optionally, determining a first equivalent grayscale corresponding to the current load and the minimum brightness according to a relationship among load, grayscale and brightness, wherein the grayscale represents a grayscale having the same grayscale value in each channel;
[0125] Optionally, the processor of this embodiment is specifically configured to execute:
[0126] According to the grayscale of each channel of the current image, the minimum brightness corresponding to each channel grayscale is determined; according to the relationship between current intensity, grayscale and brightness, the minimum brightness corresponding to each channel grayscale and the grayscale corresponding to the current current intensity of the current image are determined; the grayscale corresponding to each channel grayscale is determined as the first equivalent grayscale.
[0127] During implementation, when the grayscale values of the R, G, and B channels are the same, the grayscale at that time is used as the grayscale, and the relationship between the grayscale, current intensity, and brightness is measured. The current current intensity corresponding to the grayscale image of each channel of the current image and the minimum brightness corresponding to the grayscale of each channel are calculated. Based on the current current intensity and minimum brightness, the grayscale at the current current intensity and minimum brightness is estimated, and this grayscale is used as the first equivalent grayscale.
[0128] In some embodiments, the relationship between the load, grayscale and brightness is obtained by changing the grayscale and load to determine the brightness of the display screen under different loads and grayscales.
[0129] Optionally, by changing the grayscale and current intensity, the brightness of the display screen under different current intensities and grayscales is determined to obtain a three-dimensional lookup table of current intensity, grayscale and brightness; wherein the change in current intensity is achieved by adjusting the load.
[0130] In practice, in order to facilitate modeling, the grayscale value, current intensity value and brightness value may all be normalized.
[0131] As shown in Figure 11, this embodiment also provides a schematic diagram of the three-dimensional relationship between current intensity, grayscale, and brightness. The left figure shows how the current intensity is varied by changing the load. The load is varied by changing the image area at a fixed grayscale, thereby detecting the brightness of the image displayed at different grayscales and current intensities. The right figure shows the three-dimensional relationship between current intensity, grayscale, and brightness in three dimensions.
[0132] During implementation, by changing the grayscale and the current intensity of the input load, measuring the corresponding brightness of the display screen, and determining the three-dimensional LUT of grayscale-minimum brightness-current intensity, based on the current intensity of the actual input load (including the current intensity of each RGB channel) and the target brightness of each RGB channel, i.e., the minimum brightness, the equivalent grayscale that can achieve the target brightness under the actual input load can be reversely determined, that is, the first equivalent grayscale corresponding to the grayscale of each channel of the image under the actual input load.
[0133] Step c: compensating the grayscale of each channel of the pixel unit according to the first equivalent grayscale corresponding to the grayscale of each channel of the pixel unit, and displaying the compensated current image.
[0134] Optionally, after obtaining the first equivalent grayscale, a compensation coefficient may be determined based on the first equivalent grayscale. For example, a ratio of the first equivalent grayscale to a preset value may be used as the compensation coefficient, and the grayscale of each channel of the current image may be compensated using the compensation coefficient. The preset value may be obtained through testing. The preset value may be greater than the first equivalent grayscale.
[0135] It should be noted that, since the first equivalent grayscale represents the equivalent grayscale corresponding to the target brightness reached by the grayscale of each channel of the pixel of the current image under the actual input load, and the current input load is less than the maximum load, the actual brightness of the grayscale of each channel of the current pixel is higher than the target brightness. Therefore, in order to adjust (reduce) the actual brightness of the grayscale of each channel of the current pixel to the target brightness, based on the changing relationship between brightness and grayscale, it is necessary to adjust (reduce) the grayscale of each channel of the current pixel, and use the ratio of the first equivalent grayscale to a preset value greater than the first equivalent grayscale for adjustment. The grayscale of each channel is multiplied by a number less than 1. By reducing the grayscale of each channel of the current pixel, the brightness corresponding to the reduced grayscale of each channel is reduced to meet the target brightness.
[0136] In some embodiments, the processor of this embodiment is further configured to execute:
[0137] Determining, according to a relationship curve between the grayscale and the minimum brightness under the maximum load condition, a second equivalent grayscale corresponding to each channel grayscale of the pixel unit in the current image;
[0138] The grayscales of the channels of the pixel units in the current image are compensated according to the first equivalent grayscale and the second equivalent grayscale corresponding to the grayscales of the channels of the pixel units.
[0139] During implementation, after obtaining the first equivalent grayscale, the target brightness (i.e., minimum brightness) that can be displayed under the current input load can be obtained based on the relationship curve between the grayscale and the minimum brightness under the maximum load condition, thereby inferring the grayscale required to achieve the minimum brightness under the current input load, thereby obtaining the second equivalent grayscale corresponding to the grayscale of each channel of the pixel unit of the current image. Using the first equivalent grayscale and the second equivalent grayscale to determine the compensation coefficient of the pixel unit can make the compensation more accurate and the compensation effect better.
[0140] In some embodiments, the processor is specifically configured to perform:
[0141] The grayscales of the channels of the pixel units in the current image are compensated according to the ratio of the first equivalent grayscale to the second equivalent grayscale corresponding to the grayscales of the channels of the pixel units.
[0142] In practice, the ratio g1 / g2 of the first equivalent grayscale to the second equivalent grayscale is used to adjust the grayscale values (r, g, b) of each channel of the pixel unit in the current image to obtain the compensated grayscale values (r', g', b') and output them for display. The compensation formula is as follows:
[0143] In formula (5), r represents the grayscale value of the R (red) channel of the current image, g represents the grayscale value of the G (green) channel of the pixel unit in the current image, and b represents the grayscale value of the B (blue) channel of the pixel unit in the current image. Indicates the first equivalent grayscale corresponding to the grayscale value of the pixel unit R channel. Indicates the first equivalent grayscale corresponding to the grayscale value of the pixel unit G channel, Indicates the first equivalent grayscale corresponding to the grayscale value of the pixel unit B channel. Indicates the second equivalent grayscale corresponding to the grayscale value of the pixel unit R channel. Indicates the second equivalent grayscale corresponding to the grayscale value of the pixel unit G channel. represents the second equivalent grayscale corresponding to the grayscale value of the pixel unit B channel, r′ represents the grayscale value of the pixel unit R channel after compensation in the current image, g′ represents the grayscale value of the pixel unit G channel after compensation in the current image, and b′ represents the grayscale value of the pixel unit B channel after compensation in the current image.
[0144] It should be noted that the first equivalent grayscale represents the equivalent grayscale corresponding to the target brightness (minimum brightness) achieved by the grayscale of each channel of the pixel unit of the current image under the actual input load, that is, the first equivalent grayscale is the equivalent grayscale corresponding to the actual input load; the second equivalent grayscale represents the equivalent grayscale corresponding to the target brightness (minimum brightness) achieved by the grayscale of each channel of the pixel unit of the current image under the maximum load, that is, the second equivalent grayscale is the equivalent grayscale corresponding to the maximum load; since the input load of the current image is less than the maximum load, the actual brightness of the grayscale of each channel of the current pixel unit is higher than the target brightness, so in order to adjust the actual brightness of the grayscale of each channel of the current pixel unit Adjust (reduce) to the target brightness. Based on the relationship between brightness and grayscale, the ratio of the first equivalent grayscale and the second equivalent grayscale corresponding to each channel of the current pixel unit can be calculated, which is equivalent to calculating the ratio of the lowest brightness of each channel of the current pixel unit under actual load and the lowest brightness under maximum load. Multiply the ratio by the grayscale value of each channel of the current pixel unit, adjust (reduce) the grayscale value of the channel to be close to the first equivalent grayscale, and thus adjust (reduce) the actual brightness of the channel to be close to the target brightness. By reducing the grayscale of each channel of the current pixel unit, the brightness corresponding to the grayscale of each channel of the reduced pixel unit is reduced to be close to the lowest brightness under maximum load.
[0145] To facilitate modeling, the grayscale value and the minimum brightness value can be normalized. In this embodiment, the first equivalent grayscale is used to represent the grayscale value of the pixel unit of the current image when the minimum brightness is achieved under the actual input load (current current intensity); the second equivalent grayscale is used to represent the grayscale value of the pixel unit of the current image when the minimum brightness is achieved under the maximum input load.
[0146] In some embodiments, the processor of this embodiment is specifically configured to execute:
[0147] Determine the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image according to the relationship curve between the grayscale of each channel and the minimum brightness under the maximum load condition;
[0148] According to the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the second equivalent grayscale corresponding to the minimum brightness of each channel grayscale of the pixel unit in the current image is determined.
[0149] During implementation, it is necessary to measure the relationship curve between the grayscale of each channel and the minimum brightness under maximum load, as well as the relationship curve between the grayscale and the minimum brightness under maximum load. Specifically, the relationship curve between the grayscale and the minimum brightness under maximum load is determined by the following method:
[0150] By adjusting the load, the current intensity is adjusted, the brightness corresponding to different current intensities is determined, and the relationship between current intensity and brightness at each grayscale is obtained; based on the relationship between current intensity and brightness at each grayscale, the minimum brightness corresponding to each grayscale under maximum load is determined; based on the minimum brightness corresponding to each grayscale, a relationship curve between grayscale and minimum brightness is fitted.
[0151] In practice, the relationship curve between the grayscale and minimum brightness of each channel under maximum load is determined as follows:
[0152] By adjusting the load, the current intensity is adjusted, the brightness corresponding to different current intensities is determined, and the relationship between the current intensity and brightness under the grayscale of each channel is obtained; based on the relationship between the current intensity and brightness under the grayscale of each channel, the minimum brightness corresponding to each grayscale under the maximum load is determined; based on the minimum brightness corresponding to the grayscale of each channel, the relationship curve between the grayscale of each channel and the minimum brightness is fitted.
[0153] Optionally, the load is adjusted by fixing the grayscale of each channel and changing the area of the test image displayed on the display screen. By adjusting the load, the current intensity is adjusted to obtain different current intensities, and the brightness of the display screen corresponding to different current intensities is detected to obtain the relationship between the current intensity and brightness at different grayscales, where the current intensity and brightness are in a linear relationship. For each channel, the relationship between the current intensity and brightness at different grayscales corresponding to the channel is determined, such as the relationship between the current intensity and brightness at grayscales of 0.1, 0.2, 0.3, ..., 0.9, and 1 corresponding to the R channel, the relationship between the current intensity and brightness at grayscales of 0.1, 0.2, 0.3, ..., 0.9, and 1 corresponding to the G channel, and the relationship between the current intensity and brightness at grayscales of 0.1, 0.2, 0.3, ..., 0.9, and 1 corresponding to the B channel.
[0154] Based on the relationship between current intensity and brightness at different grayscales, the minimum brightness corresponding to each grayscale at maximum load is determined. Specifically, the minimum brightness corresponding to each grayscale at maximum current intensity is determined for each channel. Based on the minimum brightness corresponding to each grayscale, a curve is fitted to determine the relationship between grayscale and minimum brightness for each channel.
[0155] In practice, the relationship curve between grayscale and minimum brightness under maximum load is determined as follows:
[0156] Adjust the load to determine the brightness corresponding to different loads, determine the functional relationship based on the relationship between load and brightness, and obtain the functional relationship corresponding to each grayscale; based on the functional relationship corresponding to each grayscale, determine the minimum brightness corresponding to each grayscale under the maximum load; based on the minimum brightness corresponding to each grayscale, fit the relationship curve between grayscale and minimum brightness.
[0157] Optionally, the grayscale values of the RGB channels are set to be the same, and the same grayscale value at this time is used as the grayscale. The load is adjusted by fixing the grayscale and changing the area of the test image displayed on the display. The current intensity is adjusted by adjusting the load to obtain different current intensities, and the brightness of the display corresponding to different current intensities is detected to obtain the relationship between the current intensity and brightness at different grayscales, wherein the current intensity and brightness are in a linear relationship. Based on the relationship between the current intensity and brightness at different grayscales, the minimum brightness corresponding to each grayscale under the maximum load is determined, that is, the minimum brightness corresponding to each grayscale under the maximum current intensity is determined. Thus, based on the minimum brightness corresponding to each grayscale, a relationship curve between the grayscale and the minimum brightness is obtained by fitting.
[0158] During implementation, first, based on the relationship curve between the grayscale of each channel and the minimum brightness under the maximum load condition and the grayscale value of each channel of the pixel unit in the current image, the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image is determined; then, based on the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the grayscale corresponding to the minimum brightness of the grayscale of each channel of the pixel unit in the current image is determined, and the grayscale corresponding to the minimum brightness of the grayscale of each channel is used as the second equivalent grayscale of the pixel unit.
[0159] In some embodiments, in the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the minimum brightness changes exponentially with the change of the grayscale.
[0160] In practice, to obtain the minimum brightness of the three RGB channels and grayscale at maximum load, the area of the input image can be adjusted to change the load size, thereby changing the current intensity. This yields a curve showing how the brightness of different grayscales in the RGB channels changes with the input load current intensity, as well as a curve showing how the brightness of grayscale changes with the input load current intensity. The brightness increases with increasing grayscale.
[0161] When the load is maximum, the current intensity is maximum. According to the relationship curve between the brightness and current intensity of the grayscale of different channels, the minimum brightness of each channel grayscale at the maximum current intensity is obtained, and then the relationship curve between the minimum brightness and the grayscale of each channel is fitted, as shown in FIG12A. The embodiment provides a relationship curve between the brightness and current intensity of an RGB channel grayscale image, including a relationship curve between the brightness and current intensity under different grayscale images of the R channel, a relationship curve between the brightness and current intensity under different grayscale images of the G channel, and a relationship curve between the brightness and current intensity under different grayscale images of the B channel. The horizontal axis in the figure represents the current intensity, and the vertical axis represents the brightness. Similarly, according to the relationship curve between the brightness and current intensity of different grayscale grayscales, the minimum brightness of the grayscale grayscale at the maximum current intensity is obtained, and then the relationship curve between the minimum brightness and the grayscale grayscale is fitted, as shown in FIG12B. The embodiment provides a relationship curve between the brightness and current intensity of a grayscale grayscale image.
[0162] After obtaining the relationship between the brightness and current intensity of the grayscales of different channels, a curve of the relationship between the grayscale of each channel and the minimum brightness is fitted according to the minimum brightness of the grayscale of each channel at the maximum current intensity, as shown in FIG13A . This embodiment provides a curve of the relationship between the grayscale of RGB channels and the minimum brightness, including a curve of the relationship between the grayscale of the R channel and the minimum brightness, a curve of the relationship between the grayscale of the G channel and the minimum brightness, and a curve of the relationship between the grayscale of the B channel and the minimum brightness. The horizontal axis in the figure represents the grayscale, and the vertical axis represents the brightness. Similarly, after obtaining the relationship between the brightness and current intensity of different grayscales, a curve of the relationship between the grayscale of each grayscale and the minimum brightness is fitted according to the minimum brightness of each grayscale at the maximum current intensity, as shown in FIG13B . This embodiment provides a curve of the relationship between the grayscale of each grayscale and the minimum brightness.
[0163] Therefore, for the input pixel (r, g, b), through the relationship curve between the grayscale and the minimum brightness of the RGB channels in Figure 13A, it can be calculated that the minimum brightness corresponding to the grayscale value r of channel R is lv(r), the minimum brightness corresponding to the grayscale value g of channel G is Lv(g), and the minimum brightness corresponding to the grayscale value b of channel B is Lv(b). Substituting Lv(r), Lv(g), and Lv(b) into the relationship curve between the grayscale and the minimum brightness in Figure 13B, the second equivalent grayscale corresponding to the grayscale values r, g, and b of each channel can be obtained. at this time:
[0164] The minimum brightness corresponding to each channel is the target brightness that the current image can achieve.
[0165] According to the current intensity corresponding to the actual input load, that is, the current current intensity corresponding to the pixel unit in the current image, and the minimum brightness of the three RGB channels, the equivalent grayscale that can achieve the target brightness (i.e., minimum brightness) under the actual input load can be determined in reverse. That is, the first equivalent grayscale corresponding to the actual input load of the grayscale values r, g, and b of each channel of the pixel unit. At this time, the minimum brightness corresponding to the first equivalent grayscale of the pixel unit channel R is The minimum brightness corresponding to the first equivalent grayscale of the pixel unit channel G is The minimum brightness corresponding to the first equivalent grayscale of pixel unit channel B is
[0166] Taking the R (red) channel as an example, find all brightness values under the current current intensity corresponding to the current load, and then find the lowest brightness TargetLv 0 The corresponding first equivalent grayscale At this time, the first equivalent grayscale That is, the actual equivalent grayscale corresponding to the input R channel grayscale value r.
[0167] As shown in FIG14 , this embodiment further provides a flowchart of an algorithm processing for voltage drop compensation. During implementation, an image is input into a display device, an input load is estimated for the input image, and the average current intensity of the display screen driving circuit when the input image is displayed is estimated. At the same time, a target brightness is estimated for the input image. Based on a relationship curve between grayscale and minimum brightness under maximum load, the minimum brightness displayed by the input image (i.e., target brightness) is determined. The obtained average current intensity and minimum brightness are used to obtain a first equivalent grayscale g1 corresponding to the grayscale of each channel of the input image through a three-dimensional lookup table (LUT) based on average current intensity, grayscale, and brightness. At the same time, based on the relationship curve between grayscale and minimum brightness under maximum load, a second equivalent grayscale g2 corresponding to the grayscale of each channel of the input image is determined. Based on the ratio of the first equivalent grayscale to the second equivalent grayscale, the grayscale of each channel of the input image is compensated, and a compensated image is output.
[0168] As shown in FIG15 , this embodiment also provides a specific implementation process of voltage drop compensation, as follows:
[0169] Step 1500: Adjust the load, determine the brightness corresponding to different loads, and obtain the relationship between the load and brightness at each grayscale; based on the relationship between the load and brightness at each grayscale, determine the minimum brightness corresponding to each grayscale under the maximum load; and based on the minimum brightness corresponding to each grayscale, obtain a relationship curve between the grayscale and the minimum brightness by fitting;
[0170] Optionally, the load can be adjusted by fixing the grayscale and changing the area of the test image displayed on the display. A test image is input to the display, and the area of the test image is adjusted to obtain different loads, thereby obtaining different average loads. The brightness corresponding to different average loads is detected to obtain the relationship between average load and brightness at different grayscales.
[0171] Step 1501: Determine the brightness of the display screen under different loads and grayscales by changing the grayscale and load, and obtain a three-dimensional lookup table of load, grayscale, and brightness;
[0172] The change of the load is achieved by adjusting the load.
[0173] Step 1502: Obtain a current image, and estimate a current load corresponding to the current image based on the grayscale of each channel, the coefficient parameters of each channel, and the index parameters of each channel of the current image;
[0174] Step 1503: Determine the minimum brightness corresponding to the grayscale of each channel of the current image according to the relationship curve between the grayscale of each channel and the minimum brightness under the maximum load condition;
[0175] Step 1504: Determine the second equivalent grayscale corresponding to the lowest brightness of each grayscale channel of the current image based on the relationship curve between the grayscale and the lowest brightness under the maximum load condition;
[0176] Step 1505: Determine the minimum brightness corresponding to each channel grayscale and the first equivalent grayscale corresponding to the current load according to the three-dimensional lookup table;
[0177] Step 1506: Compensate the grayscale of each channel of the current image according to the ratio of the first equivalent grayscale to the second equivalent grayscale, and display the compensated current image.
[0178] This embodiment can realize grayscale adjustment under voltage drop conditions, achieve voltage drop compensation effect, and ensure that the brightness of the screen does not change when displaying the same color under different load conditions.
[0179] As shown in Figures 16A and 16B, this embodiment provides a compensation effect comparison diagram. By estimating different loads and adjusting the grayscale value of the input image, the display brightness of the final screen is made consistent. After the input image is compensated using the compensation algorithm in this embodiment, the brightness under different load conditions tends to be consistent. Under normal circumstances, the greater the load OPR%, the lower the brightness. After compensation by the implementation method of the present disclosure, the brightness under different load conditions is almost the same. This embodiment can accurately reflect the current load state of the screen through innovative load estimation, thereby accurately estimating the first equivalent grayscale g1 and the second equivalent grayscale g2 of the current screen pixel, and then use the ratio g1 / g2 of the first equivalent grayscale to the second equivalent grayscale to adjust the actual grayscale of the input to achieve voltage drop compensation.
[0180] Based on the same inventive concept, an embodiment of the present disclosure further provides a display device, as shown in FIG17 . The display device includes a display screen 1700 and a control circuit 1701 , wherein:
[0181] The display screen 1700 is configured to display content;
[0182] The control circuit 1701 includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and perform the following steps:
[0183] Obtain the current image, estimate the current current intensity of the display screen driver circuit when the current image is displayed, and determine the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0184] Determining a first equivalent grayscale corresponding to the current current intensity and the minimum brightness of the grayscale of each channel of the pixel unit according to the relationship between the current intensity, the grayscale and the brightness, wherein the grayscale represents a grayscale with the same grayscale value of each channel;
[0185] The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
[0186] Based on the same inventive concept, the embodiment of the present disclosure also provides a voltage drop compensation method. The principle of solving the problem by this method is similar to that of the display device. Therefore, the implementation of this method can refer to the implementation of the display device, and the repeated parts will not be repeated.
[0187] As shown in FIG18 , the implementation process of the voltage drop compensation method is as follows:
[0188] Step 1800: Acquire a current image, determine the input load of the display screen when displaying the current image, and determine the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0189] Step 1801: Determine a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of the pixel unit under the input load;
[0190] Step 1802 : Compensate the grayscale of each channel of the pixel unit according to the first equivalent grayscale corresponding to the grayscale of each channel of the pixel unit, and display the compensated current image.
[0191] Based on the same inventive concept, the embodiment of the present disclosure also provides an electronic device, which solves the problem based on a principle similar to that of the display device. Therefore, the implementation of the electronic device can refer to the implementation of the display device, and the repeated parts will not be repeated.
[0192] As shown in FIG19 , the electronic device includes a processor 1900 and a memory 1901 . The memory 1901 is used to store programs executable by the processor 1900 . The processor 1900 is used to read the programs in the memory 1901 and perform the following steps:
[0193] Obtaining the current image, determining the input load of the display screen when the current image is displayed, and determining the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0194] Determine a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of the pixel unit under the input load;
[0195] The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
[0196] Based on the same inventive concept, the embodiment of the present disclosure also provides a voltage drop compensation device, which solves the problem based on a principle similar to that of the display device. Therefore, the implementation of this method can refer to the implementation of the display device, and the repeated parts will not be repeated.
[0197] As shown in FIG20 , the device includes:
[0198] The intensity brightness estimation module 2000 is used to obtain the current image, determine the input load of the display screen when the current image is displayed, and determine the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image;
[0199] An equivalent grayscale determining module 2001 is configured to determine a first equivalent grayscale corresponding to the lowest brightness of the grayscales of each channel of the pixel unit under the input load;
[0200] The grayscale compensation display module 2002 is configured to compensate the grayscale of each channel of the pixel unit according to the first equivalent grayscale corresponding to the grayscale of each channel of the pixel unit, and display the compensated current image.
[0201] Based on the same inventive concept, embodiments of the present disclosure provide a computer storage medium comprising computer program code. When executed on a computer, the computer program code causes the computer to execute any of the voltage drop compensation methods discussed above. Because the principles underlying the problems solved by the computer storage medium are similar to those of the voltage drop compensation methods, the implementation of the computer storage medium can be referenced to the implementation of the methods, and any repetitive details will not be repeated.
[0202] In a specific implementation process, computer storage media may include: Universal Serial Bus Flash Drive (USB), mobile hard disk, Read-Only Memory (ROM), Random Access Memory (RAM), magnetic disk or optical disk, and other storage media that can store program code.
[0203] Based on the same inventive concept, embodiments of the present disclosure further provide a computer program product comprising computer program code that, when executed on a computer, causes the computer to perform any of the voltage drop compensation methods discussed above. Because the principles underlying the problems solved by the aforementioned computer program products are similar to those of the voltage drop compensation methods, the implementation of the aforementioned computer program products can be referenced to the implementation of the methods, and any repetitive details will not be repeated.
[0204] The computer program product can employ any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or component, or any combination thereof. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof.
[0205] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.
[0206] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.
[0207] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.
[0208] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.
[0209] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.
Claims
1. A display device, wherein: The display device includes a display screen and a control circuit, wherein: The display screen is configured to display content; The control circuit includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and perform the following steps: Obtaining the current image, determining the input load of the display screen when the current image is displayed, and determining the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image; Determine a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of the pixel unit under the input load; The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
2. The device according to claim 1, wherein The processor is specifically configured to execute: According to the relationship among load, grayscale and brightness, a first equivalent grayscale corresponding to the input load and the lowest brightness of the grayscale of each channel of the pixel unit is determined, wherein the grayscale represents a grayscale with the same grayscale value of each channel.
3. The device according to claim 2, wherein The relationship between the load, grayscale and brightness is obtained by changing the grayscale and load to determine the brightness of the display screen under different loads and grayscales.
4. The apparatus according to claim 1, wherein The processor is specifically configured to: An input load corresponding to the current image is determined according to the grayscale of each channel of the pixel unit in the current image, the coefficient parameter of each channel, and the exponential parameter of each channel.
5. The device according to claim 4, wherein The coefficient parameter is determined according to the ratio of the current intensity of each channel grayscale image to the total current intensity; the total current intensity is obtained by summing the current intensities corresponding to each channel grayscale image.
6. The device according to claim 4, wherein The exponential parameter is determined based on the variation law of brightness and grayscale of each channel in the relationship curve between grayscale and brightness of each channel, and the relationship curve between grayscale and brightness of each channel is determined based on the brightness corresponding to different grayscales in the grayscale image of each channel; wherein the brightness varies exponentially with the variation of grayscale of each channel.
7. The apparatus according to claim 1, wherein The processor is specifically configured to determine the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image in the following manner: According to the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image is determined.
8. The apparatus according to claim 1, wherein The processor is further configured to execute: Determining, according to a relationship curve between the grayscale and the minimum brightness under the maximum load condition, a second equivalent grayscale corresponding to each channel grayscale of the pixel unit in the current image; The grayscales of the channels of the pixel units in the current image are compensated according to the first equivalent grayscale and the second equivalent grayscale corresponding to the grayscales of the channels of the pixel units.
9. The apparatus according to claim 8, wherein The processor is specifically configured to execute: Determine the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image according to the relationship curve between the grayscale of each channel and the minimum brightness under the maximum load condition; According to the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the second equivalent grayscale corresponding to the minimum brightness of each channel grayscale of the pixel unit in the current image is determined.
10. The apparatus according to claim 8, wherein The relationship curve between the grayscale and the minimum brightness under the maximum load is obtained by fitting the minimum brightness corresponding to each grayscale under the maximum load; the minimum brightness corresponding to each grayscale under the maximum load is determined based on the functional relationship corresponding to each grayscale, and the functional relationship is determined based on the relationship between load and brightness.
11. The apparatus according to claim 8, wherein In the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the minimum brightness changes exponentially with the change of the grayscale.
12. The apparatus according to claim 8, wherein The processor is specifically configured to execute: The grayscales of the channels of the pixel units in the current image are compensated according to the ratio of the first equivalent grayscale to the second equivalent grayscale corresponding to the grayscales of the channels of the pixel units.
13. A display device, wherein: The display device includes a display screen and a control circuit, wherein: The display screen is configured to display content; The control circuit includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and perform the following steps: Obtain the current image, estimate the current current intensity of the display screen driver circuit when the current image is displayed, and determine the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image; Determining a first equivalent grayscale corresponding to the current current intensity and the minimum brightness of the grayscale of each channel of the pixel unit according to the relationship between the current intensity, the grayscale and the brightness, wherein the grayscale represents a grayscale with the same grayscale value of each channel; The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
14. A method for compensating for voltage drop, wherein: The method includes: Obtaining the current image, determining the input load of the display screen when the current image is displayed, and determining the minimum brightness corresponding to the grayscale of each channel of at least one pixel unit in the current image; Determine a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of the pixel unit under the input load; The grayscales of the channels of the pixel unit are compensated according to the first equivalent grayscales corresponding to the grayscales of the channels of the pixel unit, and the compensated current image is displayed.
15. The method according to claim 14, wherein The determining, under the condition of the input load, a first equivalent grayscale corresponding to the lowest brightness of the grayscale of each channel of each pixel unit includes: According to the relationship among load, grayscale and brightness, a first equivalent grayscale corresponding to the input load and the lowest brightness of the grayscale of each channel of the pixel unit is determined, wherein the grayscale represents a grayscale with the same grayscale value of each channel.
16. The method according to claim 15, wherein The relationship between load, grayscale and brightness is determined as follows: By changing the grayscale and load, the brightness of the display screen under different loads and grayscales is determined, and a three-dimensional lookup table of load, grayscale and brightness is obtained.
17. The method according to claim 14, wherein: The estimating the input load of the display screen when the current image is displayed includes: An input load corresponding to the current image is determined according to the grayscale of each channel of the pixel unit in the current image, the coefficient parameter of each channel, and the exponential parameter of each channel.
18. The method according to claim 17, wherein The coefficient parameters are determined as follows: Determine the sum of the current intensities of the grayscale images of each channel according to the current intensities corresponding to the grayscale images of each channel; The coefficient parameters corresponding to each channel are determined according to the ratio of the current intensity of the grayscale image of each channel to the total current intensity.
19. The method according to claim 17, wherein The index parameters are determined as follows: For each channel grayscale image, determine the brightness of the grayscale image corresponding to different grayscales, and obtain a relationship curve between the grayscale and brightness of each channel, wherein the brightness changes exponentially with the change of the grayscale of each channel; According to the variation rules of the brightness and the grayscale of each channel in the relationship curve between the grayscale and brightness of each channel, the index parameters corresponding to each channel are determined.
20. The method according to claim 14, wherein Determining the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image includes: According to the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the minimum brightness corresponding to the grayscale of each channel of the pixel unit in the current image is determined.
21. The method according to claim 14, wherein The method further includes: Determining, according to a relationship curve between the grayscale and the minimum brightness under the maximum load condition, a second equivalent grayscale corresponding to each channel grayscale of the pixel unit in the current image; The grayscales of the channels of the pixel units in the current image are compensated according to the first equivalent grayscale and the second equivalent grayscale corresponding to the grayscales of the channels of the pixel units.
22. The method according to claim 21, wherein The determining of the second equivalent grayscales corresponding to the grayscales of each channel of the pixel unit in the current image includes: According to the relationship curve between the grayscale and minimum brightness of each channel under the maximum load condition, determine the current image The lowest brightness corresponding to each channel grayscale of the pixel unit in the image; According to the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the second equivalent grayscale corresponding to the minimum brightness of each channel grayscale of the pixel unit in the current image is determined.
23. The method according to claim 21, wherein The relationship curve between grayscale and minimum brightness under maximum load is determined as follows: Adjust the load, determine the brightness corresponding to different loads, determine the functional relationship based on the relationship between load and brightness, and obtain the functional relationship corresponding to each grayscale; According to the functional relationship corresponding to each grayscale, determine the minimum brightness corresponding to each grayscale under maximum load; According to the minimum brightness corresponding to each grayscale, a relationship curve between grayscale and minimum brightness is obtained by fitting.
24. The method according to claim 23, wherein Adjust the load as follows: The load is adjusted by fixing the grayscale of the test position and changing the area of the test image displayed on the display.
25. The method according to claim 21, wherein In the relationship curve between the grayscale and the minimum brightness under the maximum load condition, the minimum brightness changes exponentially with the change of the grayscale.
26. The method according to claim 21, wherein The compensating the grayscales of each channel of the pixel unit in the current image according to the first equivalent grayscale and the second equivalent grayscale corresponding to the grayscales of each channel of the pixel unit includes: The grayscales of the channels of the pixel units in the current image are compensated according to the ratio of the first equivalent grayscale to the second equivalent grayscale corresponding to the grayscales of the channels of the pixel units.
27. An electronic device, wherein: The electronic device includes a processor and a memory, wherein the memory is used to store a program executable by the processor, and the processor is used to read the program in the memory and execute the steps of any one of the methods described in claims 14 to 26.
28. A computer storage medium having a computer program stored thereon, wherein: When the program is executed by a processor, the steps of the method according to any one of claims 14 to 26 are implemented.
Citation Information
Patent Citations
LCD backlight adjustment control method and LCD backlight adjustment control device based on image load analysis
CN105632411A
Voltage drop compensator for display panel and display device including the same
CN105895013A
Display apparatus and brightness uniformity compensation method thereof
CN111508404A
Display processing method and device
CN111767016A
Display screen voltage drop compensation method and device
CN117437885A