Backlight diffusion parameter generation method, display control method and device, and display device

Abstract

A backlight diffusion parameter generation method, a display control method and device, and a display device, the method comprising: selecting and measuring light diffusion data of at least one light emitting area in a plurality of light emitting areas of a display device, wherein the light diffusion data comprises luminance data of a plurality of pixels on a display panel when only one light emitting area is lit, and distance data between positions corresponding to the plurality of pixels and a position of the lit light emitting area; preprocessing the light diffusion data to obtain effective pixels; performing function fitting according to data corresponding to the plurality of effective pixels to obtain a point diffusion function representing a relationship between diffusion luminance and diffusion distance; and storing a backlight diffusion parameter lookup table, the backlight diffusion parameter lookup table comprising a plurality of sub-tables, each sub-table corresponding to one or more light emitting areas affected when only one light emitting area is lit, and each sub-table comprising a plurality of diffusion distances and diffusion luminance corresponding to each diffusion distance.

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of display technology, and particularly to a method for generating backlight diffusion parameters, a display control method and apparatus, and a display device. Background Technology

[0002] Liquid crystal displays (LCDs) require a backlight module to provide a light source to the display panel. In recent years, with the enhancement of controller computing power and technological advancements, local dimming has been widely used in the field of high-quality displays. For example... Figure 1A As shown, local dynamic dimming achieves the same display effect as full-brightness backlighting by dimming the backlight in the darker areas of the displayed image and compensating accordingly in the display control of the liquid crystal display device. Local dynamic dimming can effectively reduce overall power consumption and improve image contrast, which is of particular importance for mobile devices and ultra-large-size display devices. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] This disclosure provides a method for generating backlight diffusion parameters in a display device including a backlight module and a display panel. The backlight module includes a light-emitting plate and an optical film group located between the light-emitting plate and the display panel. The light-emitting plate includes multiple light-emitting areas, and the display panel includes multiple pixels. The method for generating backlight diffusion parameters includes:

[0005] Select and measure the light diffusion data of at least one of the plurality of light-emitting areas, wherein the light diffusion data includes the brightness data of a plurality of pixels on the display panel when only one of the light-emitting areas is lit, and the distance data between the positions of the plurality of pixels and the position of the lit light-emitting area.

[0006] The light diffusion data is preprocessed to obtain effective pixels;

[0007] A point diffusion function characterizing the relationship between diffusion brightness and diffusion distance is obtained by performing function fitting based on the data corresponding to multiple effective pixels;

[0008] A backlight diffusion parameter lookup table is stored. The backlight diffusion parameter lookup table includes multiple sub-tables. Each sub-table corresponds to one or more light-emitting areas that are affected when only one light-emitting area is lit. Each sub-table includes multiple diffusion distances and diffusion brightness corresponding to each diffusion distance.

[0009] Optionally, when only one of the light-emitting areas is lit, the number of affected light-emitting areas is 4y, and the number of sub-tables is y, where y is a natural number greater than or equal to 1.

[0010] Optionally, the diffusion distance in each of the sub-tables is represented by the two-dimensional coordinates of the corresponding pixel.

[0011] Optionally, the diffusion brightness stored in each of the sub-tables is not 0.

[0012] Optionally, each of the sub-tables includes multiple pixel coordinate binding points and a diffusion brightness corresponding to each pixel coordinate binding point.

[0013] This disclosure also provides a display control method, including:

[0014] The backlight brightness of each luminous area is set according to the grayscale of the image to be displayed;

[0015] The backlight diffusion parameters of the backlight module of the display device are obtained, wherein the backlight diffusion parameters of the backlight module are obtained in advance according to the backlight diffusion parameter generation method as described in any embodiment of the present disclosure and stored in the display device;

[0016] The equivalent backlight brightness of each pixel is calculated based on the set backlight brightness and backlight diffusion parameters of each light-emitting area;

[0017] The corresponding compensation data is calculated based on the equivalent backlight brightness of each pixel;

[0018] The backlight module is controlled to set the backlight brightness to illuminate the light-emitting area, and the display panel is controlled to display images according to the compensation data.

[0019] Optionally, calculating the equivalent backlight brightness of each pixel based on the set backlight brightness and backlight diffusion parameters of each light-emitting area includes:

[0020] Identify A*B effective light-emitting regions that affect pixel brightness, where A and B are positive integers;

[0021] Obtain the weights of (A*B-1) effective light-emitting regions other than the light-emitting region where the pixel is located, and calculate the weights of the (A*B-1) effective light-emitting regions and a;

[0022] Calculate the weight b = 1 - a of the light-emitting region where the pixel is located;

[0023] Calculate the total diffusion brightness of the A*B effective light-emitting areas in the pixel based on the diffusion weight data corresponding to the A*B effective light-emitting areas and the set backlight brightness.

[0024] The total diffuse brightness of the A*B effective light-emitting areas in the pixel is taken as the equivalent backlight brightness of the pixel.

[0025] This disclosure also provides a display control device, including a memory; and a processor connected to the memory, the memory being used to store instructions, the processor being configured to execute the steps of the display control method described in any embodiment of this disclosure based on the instructions stored in the memory.

[0026] This disclosure also provides a display device, including a display control device, a display panel, and a backlight module as described in any embodiment of this disclosure.

[0027] This disclosure also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the display control method described in any embodiment of this disclosure.

[0028] After reading and understanding the accompanying diagrams and detailed descriptions, other aspects can be understood. Attached Figure Description

[0029] The accompanying drawings are provided to further illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shapes and sizes of the components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this disclosure.

[0030] Figure 1A This is a schematic diagram illustrating the principle of local dynamic dimming technology.

[0031] Figure 1B A schematic diagram of the light emission range of a single light-emitting region without modulation by the optical film group;

[0032] Figure 1C A schematic diagram of the diffusion range after modulation by an optical film group when a single light-emitting area includes 2*2 Mini LEDs;

[0033] Figure 1D This is a schematic diagram of another diffusion range after modulation by an optical film group when a single light-emitting area includes 2*2 Mini LEDs;

[0034] Figure 1E A schematic diagram of the diffusion range after modulation by an optical film group when a single light-emitting area includes 3*2 Mini LEDs;

[0035] Figure 1F This is a schematic diagram of the diffusion range after modulation by an optical film group when a single light-emitting area includes 2*1 Mini LEDs.

[0036] Figure 2 This is a schematic diagram of the display control principle provided according to an embodiment of the present disclosure;

[0037] Figure 3 This is a schematic flowchart of a backlight diffusion parameter generation method according to an embodiment of the present disclosure;

[0038] Figure 4A This is a schematic diagram of the software interface for a brightness acquisition device to acquire brightness data according to an embodiment of the present disclosure;

[0039] Figure 4B This is a schematic diagram comparing untruncated data and truncated data according to an embodiment of the present disclosure;

[0040] Figure 5 This is a schematic diagram of the diffusion range of a single light-emitting region according to an embodiment of the present disclosure;

[0041] Figure 6 This is a schematic diagram showing the curve fitting results of three function models according to embodiments of the present disclosure;

[0042] Figure 7A This is a diagram illustrating the data distribution of a single sub-table.

[0043] Figure 7B This is a simplified schematic diagram illustrating the principle of binding points to a single sub-table using pixel coordinates.

[0044] Figure 8 A flowchart illustrating a display control method provided for an exemplary embodiment of this disclosure;

[0045] Figure 9 This is a schematic diagram of the structure of a display control device provided for an exemplary embodiment of the present disclosure. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this disclosure clearer, the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in this disclosure can be arbitrarily combined with each other.

[0047] Unless otherwise defined, the technical or scientific terms used in the embodiments of this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar terms used in the embodiments of this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" indicate that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, but do not exclude other elements or objects.

[0048] Mini-Light Emitting Diode (Mini LED) technology refers to inorganic light-emitting diodes with a chip area of ​​100-200μm. Mini LEDs inherit the high efficiency, high brightness, high reliability, and fast response time of inorganic LEDs, and are self-emissive without the need for light-emitting elements. They also offer advantages such as energy saving, simple structure, small size, and thinness. Furthermore, they have a longer lifespan, higher brightness, better material stability, and no image burn-in. When applied to LCD devices, they enable multi-zone local dimming, reducing backlight power consumption and improving screen contrast by adjusting the brightness of each zone.

[0049] The display device includes a backlight module and a display panel. The backlight module includes a light-emitting plate and an optical film assembly located between the light-emitting plate and the display panel. The light-emitting plate includes multiple light-emitting areas, and the optical film assembly includes at least prism sheets, diffusers, and polarizers. In related technologies, during the display process, the brightness required by each light-emitting area is first set according to the grayscale of the displayed image. Each pixel in the display panel then controls the rotation angle of the liquid crystal molecules in its region based on the obtained brightness. For example... Figures 1B to 1F As shown, the light-emitting panel 100 is positioned opposite the display panel, and the dimensions of their opposing surfaces are approximately equal. The light-emitting panel can be divided into several light-emitting areas 111, for example, an array of M*N light-emitting areas, where both M and N do not exceed 10. 2 The order of magnitude; the pixel resolution of the display panel is W*H, that is, W*H pixels arranged in an array, where both W and H are at least 10. 3 The resolution of the light-emitting area is on the order of magnitude smaller than that of the display panel's pixel resolution, so the resolution of the light-emitting area is generally much smaller than that of the display panel's pixel resolution.

[0050] Each light-emitting area 111 includes at least one light-emitting element 110, which can be implemented by a Mini LED or any other form of light-emitting device. Each light-emitting element can be equivalent to a point light source or a cosine light emitter. If a single light-emitting area includes only one Mini LED, such as Figure 1B As shown in (1), the light emission range of the light-emitting area 200' without modulation by the optical film group is basically circular; if a single light-emitting area includes 2*2 Mini LEDs, such as Figure 1BAs shown in (2), the light emission range 200' of the light-emitting area itself, without modulation by the optical film group, resembles a petal shape. However, the light emitted from the light-emitting area needs to be modulated by the optical film group before it reaches multiple pixels of the display panel; that is, the light emission range 200' of the light-emitting area itself is modulated into a diffusion range 200. The diffusion range of the light-emitting area is affected by many factors, such as the size of the light-emitting element, the light emission angle of the light-emitting element, the arrangement position of the light-emitting element in the light-emitting area, and the characteristics of each optical film material in the optical film group. However, for a certain model of display device, once the model of the light-emitting element, its arrangement position, the material and characteristics of the optical film group, etc., are determined, the same function can be used to describe the backlight characteristics of the same model of display device.

[0051] When multiple identical light-emitting elements are arranged in each light-emitting region in a centrally symmetrical manner, the diffusion range 200 obtained by the light emitted from a single light-emitting region after modulation by the optical film group can be, for example, Figure 1C The circle shown has a radius of r, or as shown in the figure. Figure 1D The rounded rectangle shown. Figure 1B and 1C In this configuration, each light-emitting region includes light-emitting elements 110 arranged in a 2x2 array. When multiple identical light-emitting elements are arranged in each region, and all elements are arranged axially symmetrically rather than centrosymmetrically, the profile shape of the diffusion range 200 obtained after the light emitted from a single light-emitting region is modulated by the optical film assembly can be, for example, [missing information]. Figure 1E The shape shown, or as Figure 1F The ellipse shown. Wherein, Figure 1E In the middle, each light-emitting area includes light-emitting elements 110 arranged in a 3*2 array; Figure 1F In the process, each light-emitting area includes light-emitting elements 110 arranged in a 2*1 array.

[0052] The shapes of the diffusion ranges in the above figures are merely for illustrating the principles of the embodiments of this disclosure and are not intended to limit the diffusion range of the luminescent area. Those skilled in the art can, under the guidance of this disclosure, obtain and calculate the point diffusion function of elliptical or other shaped luminescent areas without exceeding the scope of this disclosure.

[0053] The light intensity of a single light-emitting element decreases with increasing diffusion distance, and this decrease is essentially isotropic. Similarly, the light intensity of a single light-emitting area also decreases with increasing diffusion distance. Physically, the area containing one light-emitting area corresponds to the area containing several pixels; therefore, different pixels within the same area receive different backlight brightness. Considering that the light emitted from the light-emitting area has a diffusion range after modulation by the optical film group, the same pixel will be affected by the light emitted from different light-emitting areas.

[0054] Figure 2 This is a schematic diagram illustrating the display control principle of local dynamic dimming according to an embodiment of the present disclosure. During local dynamic dimming, the display control device 400 receives the image to be displayed and generates a backlight control signal and a display panel control signal. The backlight control signal can be generated based on the grayscale distribution characteristics of the image to be displayed, thereby controlling different light-emitting areas to exhibit different brightness levels. When the backlight brightness of a local area changes, corresponding compensation data is input into the display panel control signal to accurately achieve the target display effect. This compensation process needs to consider the change in the backlight brightness of each pixel relative to the static high-brightness backlight after the backlight change.

[0055] The backlight received by each pixel comes not only from the light-emitting area directly opposite it but also from neighboring light-emitting areas. The brightness diffusion of each light-emitting area exhibits highly complex non-linear characteristics. If the backlight diffusion parameters cannot be accurately modeled and the influence of surrounding light-emitting areas on brightness is ignored, appropriate compensation data cannot be obtained, directly affecting the quality of the final displayed image. This is one of the main reasons for the unsatisfactory dynamic dimming display effect in related technologies. To address this problem, this disclosure proposes a method for generating backlight diffusion parameters. This method uses a point diffusion function to model the backlight diffusion parameters and solves the model parameters through backlight illumination experiments. Based on this, the equivalent backlight brightness of W*H pixels after diffusion is calculated according to the backlight diffusion parameters of the M*N partition, thereby obtaining compensation data.

[0056] In this embodiment of the disclosure, the compensation data refers to the compensated grayscale value of each pixel on the display panel. In some exemplary embodiments, the compensated grayscale value of each pixel can be determined in the following manner:

[0057] Calculate the compensation rate of each pixel on the display panel, the compensation rate S=(Lmax / Lnew)^(1 / gamma), where Lmax is the original backlight brightness value of the pixel, Lnew is the calculated equivalent backlight brightness value of the pixel, gamma is the gamma value of the display panel, and ^ is the exponential operation.

[0058] Determine the compensated grayscale value for each pixel, where Gnew = Gori * S, and Gori is the original grayscale value of the pixel.

[0059] In this disclosure, the backlight diffusion parameters include parameters used to describe the diffusion range of the light-emitting area. For example, the backlight diffusion parameters may include the diffusion brightness corresponding to different diffusion distances when only one light-emitting area is lit. Furthermore, the backlight diffusion parameters may also include, for a single pixel, all A*B effective light-emitting areas affecting the brightness of that pixel, and the diffusion weight data corresponding to each effective light-emitting area. In this disclosure, the effective light-emitting area of ​​a pixel refers to all light-emitting areas that affect the brightness of that pixel.

[0060] The variation of brightness in the luminous region with diffusion distance can be described by the point spread function (PSF). In optical systems, the PSF can be used to describe the light field distribution of the output image when the input object is a point light source. The method proposed in this disclosure simulates the diffusion of the luminous region by calculating the backlight diffusion weight based on the diffusion distance. By repeatedly illuminating a single luminous region and processing the display panel data, the diffusion range of a luminous region is obtained, and the diffusion weight corresponding to different distances from the center of the luminous region is accurately calculated. Thus, in subsequent display control, the equivalent backlight brightness corresponding to each pixel can be calculated based on the diffusion weight, and accurate compensation data can be obtained based on brightness equivalence relationships, etc.

[0061] The methods and apparatus of embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0062] Figure 3 This is a schematic flowchart of a backlight diffusion parameter generation method according to an embodiment of the present disclosure. The backlight diffusion parameter generation method is used in a display device including a backlight module and a display panel. The backlight module includes a light-emitting plate and an optical film group located between the light-emitting plate and the display panel. The light-emitting plate includes multiple light-emitting areas, and the display panel includes multiple pixels. The backlight diffusion parameter generation method includes:

[0063] Step 110: Select and measure the light diffusion data of at least one of the multiple light-emitting areas, wherein the light diffusion data includes the brightness data of multiple pixels on the display panel when only one light-emitting area is lit, and the distance data between the positions of the multiple pixels and the position of the lit light-emitting area.

[0064] Step 120: Preprocess the illumination diffusion data to obtain effective pixels;

[0065] Step 130: Perform function fitting based on the data corresponding to multiple effective pixels to obtain the point diffusion function that characterizes the relationship between diffusion brightness y and diffusion distance x;

[0066] Step 140: Store the backlight diffusion parameter lookup table. The backlight diffusion parameter lookup table includes multiple sub-tables. Each sub-table corresponds to one or more light-emitting areas that are affected when only one light-emitting area is lit. Each sub-table includes multiple diffusion distances and the diffusion brightness corresponding to each diffusion distance.

[0067] In this embodiment of the disclosure, when a certain light-emitting area is lit and the brightness data of multiple pixels on the display panel is collected, it is necessary to control the deflection degree of the liquid crystal at the position corresponding to each pixel on the display panel to be the same. For example, the liquid crystal cell in the display panel can allow all the light emitted by a single light-emitting area and adjusted by the optical film group to pass through. When describing the distance data between the position corresponding to multiple pixels and the position of the lit light-emitting area, the distance between the orthographic projection of the pixel center position on the display panel and the orthographic projection of the light-emitting area center position on the display panel can be used as the distance between the position corresponding to the pixel and the position of the light-emitting area.

[0068] In this embodiment of the disclosure, when a single light-emitting area is lit up, the pixels that fall within the diffusion range of that light-emitting area are referred to as the effective pixels corresponding to that light-emitting area.

[0069] The backlight diffusion parameter generation method of this disclosure divides the backlight diffusion parameter lookup table into multiple sub-tables. Each sub-table corresponds to one or more light-emitting areas that are affected when only one light-emitting area is lit. Each sub-table includes multiple diffusion distances and the diffusion brightness corresponding to each diffusion distance. This greatly reduces the number of bits of diffusion distance stored in the backlight diffusion parameter lookup table, thereby greatly reducing the hardware's storage requirements.

[0070] In some exemplary embodiments, in step 110, multiple light-emitting areas in different regions of the display device can be selected, and the light diffusion data of each light-emitting area is measured. The light diffusion data includes the brightness data of multiple pixels on the display panel when each light-emitting area is individually illuminated, and the distance data between the position of each pixel and the position of the illuminated light-emitting area. The position of the pixel can be described by its coordinates on the display panel, and the position of the light-emitting area can be described by the coordinates corresponding to the orthographic projection of the geometric center of the light-emitting area onto the display panel.

[0071] Brightness measurement can be achieved using various brightness measurement devices, such as the CA-S25w two-dimensional color analyzer. Figure 4AThis is a schematic diagram of the software interface for a CA-S25w two-dimensional color analyzer to acquire brightness data according to an embodiment of this disclosure. By photographing the light-emitting surface of the display panel, the maximum diffusion distance and diffusion intensity of a light-emitting area (i.e., the change in diffusion brightness with diffusion distance) can be obtained based on the photographing results. When measuring light diffusion data, it is necessary to control the liquid crystal cell of the display panel to allow all light emitted from a single light-emitting area and adjusted by the optical film group to pass through.

[0072] like Figure 4A As shown, under normal circumstances, the light emitted by a single MiniLED diffuses in the same way in all directions. If any direction is selected, the light intensity of a single MiniLED exhibits an approximately two-dimensional Gaussian distribution. Therefore, in some exemplary embodiments, one-dimensional diffusion patterns in two directions that are parallel to the plane of the display panel and perpendicular to each other can be obtained and analyzed. Then, by superposition, the two-dimensional diffusion pattern of a single MiniLED in the plane parallel to the display panel can be obtained.

[0073] To ensure that the obtained data better reflects the overall situation of each location on the display panel, in some embodiments, the selected multiple light-emitting areas may include those located in the center, upper left, upper right, lower left, and lower right positions of the display device. For example, light-emitting areas at these specific locations can be selected for measurement. Obviously, other locations or different numbers of light-emitting areas can also be selected for measurement. The more light-emitting areas measured, the more comprehensively the diffusion range of the light-emitting areas at different locations can be reflected; correspondingly, the number of experiments required and the computational load of data processing will also increase. Therefore, it is possible to flexibly select according to actual needs, and even perform individual lighting measurements on all light-emitting areas.

[0074] When describing diffusion distance, it can be based on the distance between the pixel's location and the location of the luminous area (when calculating the distance between the pixel's location and the luminous area, the distance between the orthographic projection of the pixel's center on the display panel and the orthographic projection of the luminous area's center on the display panel can be used as the distance between the pixel's location and the luminous area). Furthermore, when describing diffusion distance, the distance between the centers of two adjacent pixels can be considered as one unit length. For example, a diffusion distance of 5 means that the distance between the pixel's center and the luminous area's center is 5 units. Therefore, when collecting illumination diffusion data for a pixel's location, to facilitate calculating the distance between the pixel's location and the illuminated luminous area, pixels with integer distances between them can be selected for data collection. For example, when a single luminous area is illuminated, the brightness data of multiple pixels on the display panel and the distance data between the locations of multiple pixels and the illuminated luminous area can include: diffusion brightness and diffusion distance data of multiple pixels located at multiple different distances in the horizontal and vertical directions from the illuminated luminous area. Of course, you can also select pixels in other locations. For example, you can select each pixel in both the horizontal and vertical directions, or select a certain number of pixels at intervals, etc.

[0075] This disclosure utilizes the light emission range of the light-emitting element after passing through the optical film group for modeling, which enables each pixel to obtain a more accurate equivalent backlight brightness value, thereby making the compensation data more reasonable, preventing the loss of image details, and resulting in better visual effects.

[0076] In some exemplary embodiments, preprocessing the light diffusion data in step 120 may include:

[0077] The light diffusion data is normalized.

[0078] Since different testing instruments have varying sensitivities to minimum brightness, normalizing the light diffusion data can eliminate the influence of different instruments on the test results. The normalized diffusion brightness corresponding to each diffusion distance can also be referred to as the backlight diffusion weight.

[0079] In some exemplary embodiments, preprocessing the light diffusion data in step 120 may include:

[0080] Correct any abnormal data points.

[0081] Abnormal data points can be detected according to preset anomaly detection standards. For example, data points where the diffusion brightness changes abruptly with increasing diffusion distance can be considered abnormal data points. By correcting abnormal data points, the influence of abnormal data points caused by stains, dust, etc., on the test results can be eliminated.

[0082] According to the principle of light diffusion, the brightness of the emitted light from the emitting region is inversely correlated with the diffusion distance. Furthermore, as the diffusion distance increases, the change in brightness tends to level off. This inevitably leads to situations where lower diffusion brightness corresponds to a longer diffusion distance, such as... Figure 4B As shown, the horizontal axis represents the normalized diffusion distance (with the distance between the centers of two adjacent pixels as one unit length), and the vertical axis represents the normalized diffusion brightness (dimensionless).

[0083] In some exemplary embodiments, preprocessing the light diffusion data in step 120 may include:

[0084] The light diffusion data is truncated, and the truncated data is then normalized.

[0085] For hardware processors, such as Field-Programmable Gate Arrays (FPGAs), Digital Signal Processors (DSPs), and PLAs (Programmable Logic Arrays), they are good at performing simple logical operations. However, operations such as weight indexing and loop traversal will greatly increase the computational difficulty and hardware cost. Therefore, performing data truncation will reduce the overhead of storage media and hardware computing media, improve the computational efficiency of the backlight diffusion module, and save hardware resource consumption.

[0086] During truncation, the diffusion range of the luminous area can be obtained, and pixels within this range are considered valid pixels. This diffusion range can be illumination diffusion data with diffusion brightness within a preset brightness threshold range. For example, the preset brightness threshold can be between 95% and 99% of the brightness at the center of the luminous area. For instance, when the preset brightness threshold is 95% of the brightness at the center of the luminous area, illumination diffusion data below 5% of the brightness at the center of the luminous area is truncated; when the preset brightness threshold is 97% of the brightness at the center of the luminous area, illumination diffusion data below 3% of the brightness at the center of the luminous area is truncated; when the preset brightness threshold is 99% of the brightness at the center of the luminous area, illumination diffusion data below 1% of the brightness at the center of the luminous area is truncated. As the distance to the light source increases, the diffusion brightness will decrease. After decreasing to a certain extent, the impact on the total brightness will be negligible. To reduce the computational load, data with diffusion brightness decreasing to below the preset brightness threshold range can be removed, thereby obtaining the diffusion range of a single luminous area. Furthermore, data with excessively low brightness or that are far from the light source will have a greater relative error in brightness measurement. If this data is used for subsequent function fitting, it will lead to very inaccurate fitting results and introduce large errors.

[0087] See Figure 5 , Figure 5 This is a schematic diagram of the diffusion range of a single light-emitting area according to an embodiment of the present disclosure. The diffusion range 200 of the light-emitting area 111' affects seven light-emitting areas 111 in the horizontal direction and five light-emitting areas 111 in the vertical direction. In this embodiment, the diffusion range of each light-emitting area is different in different directions; that is, the light-emitting area can cover different numbers of light-emitting areas in different directions.

[0088] In step 130, the brightness y of the pixel is set as the diffusion brightness, and the distance x between the position of the pixel and the position of the illuminated light-emitting area is set as the diffusion distance. A point diffusion function y = f(x) is established to characterize the relationship between the diffusion brightness y and the diffusion distance x.

[0089] In some exemplary embodiments, in step 130, the obtained point spread function is a function model of at least one of the following:

[0090] Gaussian function model:

[0091] Sine function model:

[0092] Fourier function model:

[0093] Where n is the order, an, bn, cn, and w are coefficients, x is the diffusion distance, and f(x) is the diffusion brightness.

[0094] This disclosure establishes three point diffusion models: a Gaussian function model, a sine function model, and a Fourier function model. These three function models and their corresponding fitting formulas can obtain sufficiently small fitting errors, more closely reflecting the actual light diffusion of the light-emitting element. By proposing these three point diffusion models, this disclosure aligns the actual diffusion law with the theoretical model, making the backlight diffusion calculation more accurate and reducing the risk of detail loss in liquid crystal displays.

[0095] In some exemplary embodiments, each parameter in the point spread function is obtained by performing function fitting based on the data corresponding to each valid pixel, and the obtained point spread function can be used as the backlight spread parameter.

[0096] In some exemplary embodiments, to obtain more accurate results, a function is fitted based on the data of each valid pixel to obtain each parameter in the point spread function, which may include:

[0097] Statistical analysis is performed on the data of each effective pixel to obtain the average diffusion brightness corresponding to each diffusion distance, which is used as the average diffusion brightness for that diffusion distance;

[0098] Based on the relationship data between the corresponding diffusion distance and the average diffusion brightness, a function is fitted to obtain each parameter in the point diffusion function.

[0099] In one embodiment, five specific luminous areas can be selected, and data on the brightness variation with distance in both horizontal and vertical directions can be collected for each area, resulting in a total of 10 sets of light diffusion data. Theoretically, the diffusion of the luminous area is essentially isotropic in each direction of the two-dimensional plane. Analysis of experimental data also shows that the relationship between diffusion brightness and distance is basically consistent in both horizontal and vertical directions. Therefore, five sets of data from one direction can be selected as the analysis data. To eliminate random errors, the average of the five sets of analysis data is taken to obtain the average diffusion brightness corresponding to each diffusion distance, which is used as the data to be fitted. By fitting a curve of y = f(x) based on the data to be fitted, the corresponding point diffusion function can be obtained. Although theoretically light diffuses smoothly, interference from the equipment and external light during the measurement process can cause some interference to the measurement data, resulting in some fluctuations. Algorithms from related technologies can be used for curve fitting, or software tools can be directly applied for data processing, such as MATLAB or Mathematica, to perform function fitting. Figure 6As shown, the horizontal axis represents the normalized diffusion distance (with the distance between the centers of two adjacent pixels as one unit), and the vertical axis represents the difference in diffusion brightness after normalization. Each curve represents the difference between two point diffusion functions obtained by fitting two of the aforementioned three function models. For example, curve 1 represents the difference between the point diffusion function obtained by fitting the Gaussian function model and the point diffusion function obtained by fitting the Fourier function model; curve 2 represents the difference between the point diffusion function obtained by fitting the sine function model and the point diffusion function obtained by fitting the Fourier function model; and curve 3 represents the difference between the point diffusion function obtained by fitting the sine function model and the point diffusion function obtained by fitting the Gaussian function model. Figure 6 It can be seen that the point diffusion functions obtained by fitting the function through the aforementioned three function models are very similar. The three function models provided in this embodiment can fit the characteristics of the data reasonably, and the fitting results are more consistent with the data diffusion law between diffusion distance and diffusion brightness.

[0100] When calculating diffusion brightness, indexing is required using diffusion distance. Typically, the distance between a pixel and each illuminated luminous area needs to be calculated, and this calculation becomes more complex as the number of partitions increases. In step 140 of this embodiment, when establishing the backlight diffusion parameter lookup table, multiple sub-tables are created. Each sub-table corresponds to one or more luminous areas affected when only one luminous area is illuminated. Each sub-table includes multiple diffusion distances and the diffusion brightness corresponding to each diffusion distance. This significantly reduces the number of bits required to store diffusion distances in the backlight diffusion parameter lookup table, thereby greatly reducing the hardware's storage requirements.

[0101] Each sub-table established in this disclosure uses the diffusion distance within each luminous region for indexing, instead of the distance between the positions of multiple pixels within each luminous region and the position of the individually illuminated luminous region. For example, assuming each luminous region corresponds to 30*30 pixels, illuminating only one luminous region affects a total of 10*10 luminous regions, i.e., affecting 5 luminous regions in a single direction. Therefore, the calculated diffusion distance usually varies between 0 and 150 units, making the calculation process quite cumbersome. The diffusion distance in each sub-table established in this disclosure varies between 0 and 30 units. In hardware processors, such as Field-Programmable Gate Arrays (FPGAs), Digital Signal Processors (DSPs), and PLAs (Programmable Logic Arrays), storing the calculation results consumes hardware resources and is done in binary format. For example, storing the value 150 requires 8 bits of binary hardware space, while storing the value 30 only requires 5 bits of binary hardware space. This disclosure significantly reduces the storage resources required.

[0102] In some exemplary embodiments, when only one light-emitting area is lit, the number of affected light-emitting areas is 4y, and the number of sub-tables is y, where y is a natural number greater than or equal to 1.

[0103] In this embodiment of the disclosure, the outline of the diffusion range of the light-emitting region has at least two axes of symmetry. According to the principle of symmetry, a weight lookup table can be used only for a quarter of the diffusion range. This method retains the compatibility with different light patterns while minimizing the resource consumption.

[0104] In some exemplary embodiments, the diffusion distance in each sub-table is represented by the two-dimensional coordinates of the corresponding pixel. This disclosure improves operational efficiency and reduces computational overhead by setting multiple sub-tables and using the two-dimensional coordinates of pixels within a single partition instead of the diffusion distance.

[0105] In some exemplary implementations, the diffusion brightness (i.e., backlight diffusion weight) of the pixels stored in each sub-table is not 0.

[0106] like Figure 7A As shown, since the diffusion brightness of the pixels stored in each sub-table created in this disclosure is not 0, the capacity of the sub-table can be adjusted according to the amount of stored data. At least one first sub-table exists in multiple sub-tables. The number of pixels with diffusion brightness stored in the first sub-table is less than the number of pixels in the pixel area corresponding to the first sub-table. This can effectively reduce the number of data stored in the sub-table.

[0107] In some exemplary embodiments, each sub-table includes multiple pixel coordinate binding points and a diffusion brightness corresponding to each pixel coordinate binding point. In this disclosure, a pixel coordinate binding point refers to a pre-selected pixel coordinate that needs to store the corresponding diffusion brightness. The diffusion brightness of a non-pixel coordinate binding point is obtained by linear interpolation of the diffusion brightness corresponding to the two pixel coordinate binding points adjacent to the non-pixel coordinate binding point.

[0108] like Figure 7B As shown, assuming each luminous region corresponds to a pixel area of ​​5*5 pixels, in related technologies, the complete lookup table corresponding to this luminous region (i.e., a lookup table containing all pixel coordinates with non-zero diffusion brightness) needs to store the diffusion brightness corresponding to 5*5 pixel coordinates (the complete lookup table corresponding to luminous regions at the edge of the diffusion range can store less than 5*5 diffusion brightness). This disclosure, by setting multiple pixel coordinate binding points, can greatly reduce the number of diffusion brightness values ​​that need to be stored in the sub-table corresponding to each luminous region. During calculation, the diffusion brightness of pixels within the luminous region other than the pixel coordinate binding points is obtained by linear interpolation of the diffusion brightness of the pixel coordinate binding points. This disclosure, by using pixel coordinate binding points instead of a complete lookup table, further and greatly reduces the resource consumption in terms of hardware storage and algorithm hardware implementation.

[0109] In the hardware implementation of display panel algorithms, backlight diffusion calculation is the most resource-intensive part, accounting for approximately 70% to 80% of the entire chip. Therefore, the design of the backlight diffusion calculation module is crucial. This embodiment creates multiple sub-tables, each storing multiple pixel coordinate binding points and their corresponding diffusion brightness. During program execution, the diffusion brightness data corresponding to each pixel coordinate binding point can be directly read by computer software or hardware circuitry. The diffusion brightness data between two pixel coordinate binding points can be calculated through linear interpolation, eliminating the need for complex calculations. This reduces program computational overhead and hardware storage requirements, significantly reducing storage medium consumption. It also facilitates data reading and processing, improving operational efficiency. Data storage media include various forms of computer-readable storage, such as RAM, cache, and ROM.

[0110] This disclosure also provides a display control method. Figure 8 This is a schematic flowchart of a display control method according to an embodiment of the present disclosure. The display control method includes:

[0111] Step 210: Set the backlight brightness of each luminous area according to the grayscale of the image to be displayed;

[0112] Step 220: Obtain the backlight diffusion parameters of the backlight module of the display device, wherein the backlight diffusion parameters of the backlight module are obtained in advance according to the method described in any embodiment of the present disclosure and stored in the display device;

[0113] Step 230: Calculate the equivalent backlight brightness of each pixel based on the set backlight brightness and backlight diffusion parameters of each light-emitting area;

[0114] Step 240: Calculate the corresponding compensation data based on the equivalent backlight brightness of each pixel;

[0115] Step 250: Control the backlight module to set the backlight brightness to illuminate the light-emitting area, and control the display panel to display the image according to the compensation data.

[0116] In some exemplary embodiments, in step 210, setting the set backlight brightness of each light-emitting area according to the grayscale of the image to be displayed may include: setting the set backlight brightness of each light-emitting area according to the pixel grayscale statistical value corresponding to each light-emitting area.

[0117] The number of gray levels that the displayed image can represent is 2. N When N is 8, 2 can be presented. 8 =256 gray levels. Generally, the adjustable levels of backlight brightness cannot reach so many levels. In this case, an approximate brightness level can be selected based on the range to which the gray level belongs.

[0118] In some exemplary embodiments, before obtaining the backlight diffusion parameters of the display device backlight module in step 220, the backlight diffusion parameters can be stored in the memory of the display device and called during display control to implement various display control methods.

[0119] In some exemplary embodiments, step 230, calculating the equivalent backlight brightness of each pixel based on the set backlight brightness and backlight diffusion parameters of each light-emitting area, includes:

[0120] For each pixel, obtain the equivalent backlight brightness calculation formula by following these steps:

[0121] Identify A*B effective light-emitting regions that affect pixel brightness, where A and B are positive integers;

[0122] Based on the distance from the pixel to the A*B effective light-emitting regions, determine the diffusion weight data corresponding to the A*B effective light-emitting regions;

[0123] Calculate the total diffusion brightness of the A*B effective light-emitting areas in the pixel based on the diffusion weight data corresponding to the A*B effective light-emitting areas and the set backlight brightness.

[0124] The total diffuse brightness of the A*B effective light-emitting areas in the pixel is taken as the equivalent backlight brightness of the pixel.

[0125] In some exemplary embodiments, when determining all A*B effective light-emitting areas affecting pixel brightness, these areas can be determined based on the point spread function y = f(x), where A and B are positive integers. Based on the effective range of the point spread function, the effective light-emitting area of ​​each pixel can be obtained by reverse deduction. For example, based on the diffusion radius r, the pixel center can be determined, and all light-emitting areas within a radius r are considered as effective light-emitting areas. The point spread function of the backlight module can be obtained in advance according to the method described in the above embodiments and stored in the display device. For example, it can be obtained by the display device manufacturer through testing on each model of display device before shipment and stored in the memory of the display device for retrieval when needed.

[0126] In other exemplary embodiments, the backlight diffusion parameter lookup table includes A*B effective light-emitting areas for each pixel and corresponding diffusion weight data. This disclosure stores the A*B effective light-emitting areas and corresponding diffusion weight data for each pixel in the backlight diffusion parameter lookup table, eliminating the need for recalculation each time. During display control, the equivalent backlight brightness of each pixel is calculated based on the effective light-emitting areas, corresponding diffusion weight data, and the set backlight brightness.

[0127] In some exemplary embodiments, for each pixel, the formula for calculating the equivalent backlight brightness can be weighted and normalized, wherein the weight normalization process includes:

[0128] Calculate the weighted sum of A*B effective luminous regions:

[0129] Based on the calculated weights and the normalized weights corresponding to each effective luminous region.

[0130] Then, the normalized weights of all effective light-emitting areas of each pixel are used as backlight diffusion parameters and stored, and directly used for the calculation of equivalent backlight brightness, without having to recalculate each time.

[0131] In some exemplary embodiments, determining the diffusion weight data corresponding to A*B effective luminescent regions includes:

[0132] Obtain the weights of (A*B-1) effective light-emitting regions other than the light-emitting region where the pixel is located;

[0133] Calculate the weights 'a' of the (A*B-1) effective light-emitting regions other than the light-emitting region where the pixel is located;

[0134] Calculate the weight b = 1 - a of the luminous region where the pixel is located.

[0135] In local dynamic dimming technology, compensation data is obtained based on diffused backlighting; therefore, the accuracy of diffused backlighting directly affects the performance of the liquid crystal display. After obtaining the weight data of A*B effective light-emitting areas, the equivalent backlight brightness of each pixel can be calculated based on the weights of A*B effective light-emitting areas and the set backlight brightness. However, due to the limited precision of computers, when storing the normalized weights of each effective light-emitting area, the computer performs rounding or truncation operations. Therefore, if the weight data of A*B effective light-emitting areas is directly obtained, the sum of the weights of these A*B effective light-emitting areas may not equal 1, leading to a deviation in the calculation of the equivalent backlight brightness of the pixel, and consequently, a deviation in the calculation of the compensation data. This disclosure calculates the weight of the light-emitting area where the pixel is located by summing the weights of (A*B-1) effective light-emitting areas other than the light-emitting area where the pixel is located. This processing method avoids the need for further normalization and also avoids errors caused by storage precision in the weight data of A*B effective light-emitting areas.

[0136] In step 240, after obtaining the equivalent backlight brightness of the pixel, the corresponding compensation calculation can be performed to obtain the corresponding compensation data.

[0137] In step 250, the backlight module is controlled to set the backlight brightness to illuminate the light-emitting area, and the display panel is controlled to display images according to the compensation data.

[0138] To facilitate understanding, the operations that can be performed before dynamic dimming display control are summarized as follows: From measuring the point spread function of the luminous area to finally obtaining the diffusion weight parameters, the overall process is as follows:

[0139] (1) Data acquisition: Acquire illumination diffusion data of multiple pixels.

[0140] (2) Data preprocessing to obtain data on backlight diffusion range and effective pixels.

[0141] (3) Point spread function fitting: The point spread function is obtained by fitting the function based on the data of the effective pixels.

[0142] (4) Calculate the pixel backlight diffusion weight based on the fitted point diffusion function, that is, calculate the diffusion weight of all effective light-emitting areas of each pixel.

[0143] (5) Normalize the diffusion weights.

[0144] (6) Obtain the final backlight diffusion parameter lookup table and store it.

[0145] Thus, in step 220, during the process of obtaining the backlight diffusion parameters of the backlight module, the effective light-emitting area and normalized weight data of each pixel can be obtained. In step 230, the equivalent backlight brightness of each pixel is calculated based on the set backlight brightness of each light-emitting area and the backlight diffusion parameters. This is achieved by directly calling the stored effective light-emitting area and normalized weight parameters to calculate the equivalent backlight brightness. In this way, the equivalent backlight brightness of each pixel can be quickly obtained through simple matrix operations, accelerating the calculation speed.

[0146] During the display process, backlight adjustments need to be made for each frame of the image (or every few frames, depending on the control algorithm design). After each backlight adjustment, the equivalent backlight brightness of each pixel needs to be recalculated. Therefore, processing speed is crucial. Storing A*B effective luminous areas and their corresponding diffusion weight data or normalized weight data, and then directly accessing them during display control, can significantly improve processing speed.

[0147] The display control method of this disclosure, by accurately modeling the diffusion of the light-emitting area and storing the diffusion weight of the effective light-emitting area corresponding to each pixel, can easily obtain the brightness diffusion coefficient of pixels at any distance from the light-emitting area. This facilitates accurate and rapid calculation of the equivalent backlight of each pixel during the display process, obtaining a smooth backlight distribution that closely approximates the actual backlight diffusion brightness. This allows for the acquisition of corresponding compensation data, achieving display effects similar to or even better than full-backlight display. The image brightness is closer to the actual brightness of the original image in the non-low grayscale range, reducing image distortion, resulting in good image quality, high contrast, low distortion rate, and the absence of blocky or boundary lines. Furthermore, the reduction in backlight brightness in relatively dark areas of the image also leads to better overall contrast.

[0148] This disclosure also provides a display control device, including a memory; and a processor connected to the memory, the memory being used to store instructions, the processor being configured to execute steps of the display control method as described in any embodiment of this disclosure based on the instructions stored in the memory.

[0149] like Figure 9As shown, in one example, the driving module of the display device may include: a processor 910, a memory 920, a bus system 930, and a transceiver 940. The processor 910, memory 920, and transceiver 940 are connected via the bus system 930. The memory 920 stores instructions, and the processor 910 executes the instructions stored in the memory 920 to control the transceiver 940 to transmit and receive signals. Specifically, the transceiver 940 can receive an image to be displayed under the control of the processor 910. The processor 910 sets a set backlight brightness for each luminous area based on the grayscale of the image to be displayed; acquires the backlight diffusion parameters of the backlight module, wherein the backlight diffusion parameters of the backlight module are pre-obtained according to the backlight diffusion parameter generation method described in any embodiment of this disclosure and stored in the display device; calculates the equivalent backlight brightness of each pixel based on the set backlight brightness of each luminous area and the backlight diffusion parameters; calculates corresponding compensation data based on the equivalent backlight brightness of each pixel; controls the backlight module to illuminate the luminous area at the set backlight brightness; and controls the display panel to display the image according to the compensation data.

[0150] It should be understood that processor 910 can be a Central Processing Unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), off-the-shelf programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0151] Memory 920 may include read-only memory and random access memory, and provides instructions and data to processor 910. A portion of memory 920 may also include non-volatile random access memory. For example, memory 920 may also store device type information.

[0152] In addition to a data bus, the bus system 930 may also include a power bus, a control bus, and a status signal bus. However, for clarity, in... Figure 9 The general labeled all buses as Bus System 930.

[0153] In implementation, the processing performed by the processing device can be accomplished through integrated logic circuits in the hardware of the processor 910 or through software instructions. That is, the method steps of this embodiment can be executed by a hardware processor, or by a combination of hardware and software modules within the processor. The software modules can reside in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other storage media. This storage medium is located in memory 920, and the processor 910 reads information from memory 920 and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, further details are omitted here.

[0154] This disclosure also provides a display device, including a display control device, a display panel, and a backlight module as described in any embodiment of this disclosure.

[0155] This disclosure also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the display control method as described in any embodiment of this disclosure. The method of controlling the display of a display device by executing executable instructions is substantially the same as the display control method provided in the above embodiments of this disclosure, and will not be described in detail here.

[0156] In some possible implementations, various aspects of the display control method provided in this disclosure may also be implemented as a program product comprising program code that, when run on a computer device, causes the computer device to perform the steps of the display control method according to various exemplary embodiments of this disclosure as described above. For example, the computer device may execute the display control method described in the embodiments of this disclosure.

[0157] The program product may employ any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, but not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. More specific examples of readable storage media (a non-exhaustive list) include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0158] It will be understood by those skilled in the art that all or some of the steps, systems, or apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all components may be implemented as software executed by a processor, such as a digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software may be distributed on a computer-readable medium, which may include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and can be accessed by a computer. Furthermore, it is well known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0159] While the embodiments disclosed herein are as described above, the content is merely for the purpose of facilitating understanding of this disclosure and is not intended to limit this disclosure. Any person skilled in the art may make any modifications and changes to the form and details of the implementation without departing from the spirit and scope of this disclosure; however, the scope of patent protection of this disclosure shall still be determined by the scope defined in the appended claims.

Claims

1. A method for generating backlight diffusion parameters, used in a display device including a backlight module and a display panel, wherein the backlight module includes a light-emitting plate and an optical film assembly located between the light-emitting plate and the display panel; wherein, The light-emitting panel includes multiple light-emitting areas, and the display panel includes multiple pixels; the method includes: Select and measure the light diffusion data of at least one of the plurality of light-emitting areas, wherein the light diffusion data includes the brightness data of a plurality of pixels on the display panel when only one of the light-emitting areas is lit, and the distance data between the positions of the plurality of pixels and the position of the lit light-emitting area. The light diffusion data is preprocessed to obtain effective pixels; A point diffusion function characterizing the relationship between diffusion brightness and diffusion distance is obtained by performing function fitting based on the data corresponding to multiple effective pixels; A backlight diffusion parameter lookup table is stored. The backlight diffusion parameter lookup table includes multiple sub-tables. Each sub-table corresponds to one or more light-emitting areas that are affected when only one light-emitting area is lit. Each sub-table includes multiple diffusion distances and the diffusion brightness corresponding to each diffusion distance. The diffusion distance in each sub-table varies between 0 and 30 units.

2. The method according to claim 1, wherein, When only one of the light-emitting areas is lit, the number of affected light-emitting areas is 4y, and the number of sub-tables is y, where y is a natural number greater than or equal to 1.

3. The method according to claim 1, wherein, The diffusion distance in each of the sub-tables is represented by the two-dimensional coordinates of the corresponding pixel.

4. The method according to claim 1, wherein, The diffusion brightness stored in each of the sub-tables is not 0.

5. The method according to claim 4, wherein, Each of the sub-tables includes multiple pixel coordinate binding points and the diffusion brightness corresponding to each pixel coordinate binding point.

6. A display control method, comprising: The backlight brightness of each luminous area is set according to the grayscale of the image to be displayed; The backlight diffusion parameters of the backlight module of the display device are obtained, wherein the backlight diffusion parameters of the backlight module are obtained in advance according to the method of any one of claims 1 to 5 and stored in the display device; The equivalent backlight brightness of each pixel is calculated based on the set backlight brightness and backlight diffusion parameters of each light-emitting area; The corresponding compensation data is calculated based on the equivalent backlight brightness of each pixel; The backlight module is controlled to set the backlight brightness to illuminate the light-emitting area, and the display panel is controlled to display images according to the compensation data.

7. The method according to claim 6, wherein, The calculation of the equivalent backlight brightness of each pixel based on the set backlight brightness and backlight diffusion parameters of each light-emitting area includes: Identify A*B effective light-emitting regions that affect pixel brightness, where A and B are positive integers; Obtain the weights of (A*B-1) effective light-emitting regions other than the light-emitting region where the pixel is located, and calculate the weights of the (A*B-1) effective light-emitting regions and a; Calculate the weight of the light-emitting region where the pixel is located, b = 1 - a; Calculate the total diffusion brightness of the A*B effective light-emitting areas in the pixel based on the diffusion weight data corresponding to the A*B effective light-emitting areas and the set backlight brightness. The total diffuse brightness of the A*B effective light-emitting areas in the pixel is taken as the equivalent backlight brightness of the pixel.

8. A display control device, comprising a memory; and a processor connected to the memory, the memory for storing instructions, the processor being configured to perform the steps of the display control method as claimed in any one of claims 6 to 7 based on the instructions stored in the memory.

9. A display device, comprising the display control device, display panel, and backlight module as described in claim 8.

10. A computer-readable storage medium having a computer program stored thereon that, when executed by a processor, implements the display control method as described in any one of claims 6 to 7.

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