Brightness adjustment method, adjustment system, display device

Abstract

A brightness adjusting method, adjusting system and display device. The display device comprises a backlight module, and the adjusting method comprises the steps that the backlight source of the backlight module is divided into a plurality of lamp areas (S101); the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source are obtained (S102); a plurality of first brightness parameters are obtained according to the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source (S103); a second brightness parameter is obtained according to the plurality of first brightness parameters (S104); and the brightness of each lamp area is adjusted according to the second brightness parameter and the initial brightness of each lamp area (S105), so as to reduce the brightness difference between the pixel area corresponding to the lamp area in the lighting state and the pixel area corresponding to the lamp area in the extinguishing state, thereby the "halo" problem can be reduced, and the display effect of the display device can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of display, in particular to a brightness adjusting method, an adjusting system and a display device. BACKGROUND

[0002] With the rapid development of display technology, the performance requirements of the backlight source of display products in the industry are becoming higher and higher. For display products prepared by a backlight source with a local dimming function, in the case that the local area of the backlight source is lit up and the other areas are extinguished, for a display product with low contrast, a halo around the lit area is extremely easy to appear, thereby reducing the display effect of the display product. SUMMARY

[0003] Embodiments of the present application adopt the following technical solutions:

[0004] In one aspect, the embodiments of the present application provide a brightness adjusting method applied to a display device, the display device comprising a backlight module, and the adjusting method comprising:

[0005] dividing the backlight source of the backlight module into a plurality of lamp areas;

[0006] obtaining a maximum gray scale value of each lamp area and a maximum gray scale value of the backlight source;

[0007] obtaining a first brightness parameter of each lamp area according to the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source;

[0008] obtaining a second brightness parameter according to each first brightness parameter;

[0009] adjusting the brightness of each lamp area according to the second brightness parameter.

[0010] In some embodiments of the present application, the adjusting the brightness of each lamp area according to the second brightness parameter comprises:

[0011] for the lamp area in a lit state, updating the brightness value thereof; the updated brightness value is equal to the initial brightness value of the lamp area in the lit state multiplied by the second brightness parameter;

[0012] for the lamp area in an extinguished state, keeping the extinguished state.

[0013] In some embodiments of the present application, the obtaining the first brightness parameter of each lamp area according to the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source comprises:

[0014] dividing the maximum gray scale value of each lamp area by the maximum gray scale value of the backlight source to obtain a plurality of first brightness parameters same in number as the lamp areas.

[0015] In some embodiments of the present application, the obtaining the second brightness parameter according to the first brightness parameters comprises:

[0016] averaging the first brightness parameters to obtain the second brightness parameter.

[0017] In some embodiments of the present application, after the dividing the backlight source into the plurality of lamp areas and before the obtaining the maximum grayscale value of each lamp area and the maximum grayscale value of the backlight source, the method further comprises:

[0018] determining a third brightness parameter of the lamp areas;

[0019] adjusting the brightness of each lamp area when the third brightness parameter exceeds a preset value.

[0020] In some embodiments of the present application, the determining the third brightness parameter of the lamp areas comprises:

[0021] obtaining the maximum grayscale value of each lamp area and the maximum grayscale value of the backlight source;

[0022] obtaining an average value of the maximum grayscale value of each lamp area according to the maximum grayscale value of each lamp area;

[0023] determining the third brightness parameter according to the average value of the maximum grayscale value of each lamp area and the maximum grayscale value of the backlight source.

[0024] In some embodiments of the present application, the preset value is less than or equal to 30%.

[0025] In some embodiments of the present application, the display device further comprises a display panel located on the light emitting side of the backlight module; after the adjusting the brightness of each lamp area according to the second brightness parameter, the method further comprises:

[0026] determining a compensation area of the display panel according to each lamp area in the light-on state;

[0027] determining a compensation parameter of the compensation area;

[0028] adjusting the brightness of the compensation area according to the compensation parameter.

[0029] In some embodiments of the present application, the determining the compensation area according to each lamp area in the light-on state comprises:

[0030] determining a display picture in the display panel corresponding to each lamp area in the light-on state;

[0031] determining an edge pixel according to a picture pixel in the display picture.

[0032] determining the number of the picture pixels;

[0033] determining the compensation area of each of the edge pixels according to the number of the picture pixels; wherein the compensation area comprises other pixels in the pixels corresponding to the light area in the light-on state except the picture pixels.

[0034] In some embodiments of the present application, the determination of the compensation parameter of the compensation area comprises:

[0035] determining the number of pixels in the compensation area;

[0036] in the case that the number of pixels in the compensation area is less than the number of the brightness compensation levels, the compensation parameter of the compensation area is determined as zero gray scale;

[0037] in the case that the number of pixels in the compensation area is greater than or equal to the number of the brightness compensation levels, the compensation area is divided into multiple compensation sub-areas, and the number of the compensation sub-areas is the same as the number of the brightness compensation levels; wherein the pixels in the same compensation sub-area correspond to the same brightness compensation level, the compensation parameter in the same brightness compensation level is the same, and the compensation parameter in each of the brightness compensation levels is greater than or equal to zero gray scale and less than the pixel gray scale of the edge pixels.

[0038] In some embodiments of the present application, the compensation parameter of each of the compensation sub-areas gradually decreases along a first direction, and the first direction is the direction from the area where the picture pixels are located to the compensation area.

[0039] On the other hand, embodiments of the present application provide a brightness adjustment system, comprising: a controller and a backlight module electrically connected;

[0040] the backlight module is configured to provide a backlight source under the control of the controller;

[0041] wherein the controller comprises a partition dimming unit and a control unit; the control unit and the partition dimming unit are electrically connected, and the partition dimming unit and the backlight module are electrically connected;

[0042] the partition dimming unit is configured to divide the backlight source into multiple light areas according to the partition control signal from the control unit when receiving the partition control signal;

[0043] The control unit is configured to acquire and store the maximum gray scale values of each lamp area and the maximum gray scale value of the backlight source; obtain first brightness parameters corresponding to each lamp area according to the maximum gray scale values of each lamp area and the maximum gray scale value of the backlight source; obtain second brightness parameters according to the first brightness parameters; and send the partition control signal and the dimming signal;

[0044] The partition dimming unit is further configured to acquire the second brightness parameters after receiving the dimming signal, and adjust the brightness of each lamp area according to the second brightness parameters.

[0045] In some embodiments of the present application, the partition dimming unit comprises a partition subunit and a dimming subunit.

[0046] The partition subunit is configured to divide the backlight source into multiple lamp areas according to the partition control signal.

[0047] The dimming subunit is configured to acquire the second brightness parameters, update the brightness value of the lamp area in the lighting state according to the second brightness parameters, and the updated brightness value is equal to the initial brightness value of the lamp area in the lighting state multiplied by the second brightness parameters; and control the lamp area in the extinguishing state to remain in the extinguishing state.

[0048] In some embodiments of the present application, the control unit comprises a storage subunit, an acquisition subunit, a first operation subunit and a second operation subunit.

[0049] The acquisition subunit is configured to acquire the maximum gray scale values of each lamp area and the maximum gray scale value of the backlight source.

[0050] The storage subunit is configured to store the partition control signal, the dimming signal, the maximum gray scale values of each lamp area, the maximum gray scale value of the backlight source, the first brightness parameters and the second brightness parameters, and send the partition control signal and the dimming signal.

[0051] The first operation subunit is configured to divide the maximum gray scale values of each lamp area by the maximum gray scale value of the backlight source to obtain a plurality of first brightness parameters same as the number of lamp areas.

[0052] The second operation subunit is configured to average each first brightness parameter to obtain the second brightness parameter.

[0053] In some embodiments of the present application, the control unit further comprises a judgment sub-module.

[0054] The judgment sub-module is configured to determine a third brightness parameter of the lamp area, and judge whether the third brightness parameter exceeds a preset value.

[0055] In a case that the third luminance parameter exceeds the preset value, the judging sub-module triggers the storage sub-module to send the dimming signal; the third luminance parameter is a ratio of an average value of maximum gray scale values of each lamp area and a maximum gray scale value of the backlight source.

[0056] In some embodiments of the present application, the preset value is less than or equal to 30%.

[0057] In some embodiments of the present application, the system further comprises a display panel located at a light-emitting side of the backlight module, and the display panel and the control unit are electrically connected; the controller further comprises a color compensation unit, and the color compensation unit and the control unit are electrically connected.

[0058] The color compensation unit is configured to determine a compensation area of the display panel according to each lamp area in a light-on state, determine a compensation parameter of the compensation area, and the control unit is further configured to perform luminance adjustment on the compensation area according to the compensation parameter.

[0059] In some embodiments of the present application, the color compensation unit comprises a first determining sub-unit and a second determining sub-unit.

[0060] The first determining sub-unit is configured to determine a display picture in the display panel corresponding to each lamp area in a light-on state, determine an edge pixel according to a picture pixel in the display picture, determine a number of the picture pixels, and determine the compensation area of each edge pixel according to the number of the picture pixels; the compensation area is an area where other pixels except the picture pixels in the pixels corresponding to the lamp area in the light-on state are located.

[0061] The second determining sub-unit is configured to determine a number of pixels of the compensation area, determine the compensation parameter of the compensation area as zero gray scale in a case that the number of pixels of the compensation area is less than a number of luminance compensation levels, and divide the compensation area into a plurality of compensation sub-areas in a case that the number of pixels of the compensation area is greater than or equal to the number of luminance compensation levels, and the number of the compensation sub-areas is the same as the number of the luminance compensation levels.

[0062] In a case that the number of pixels in a same compensation sub-area corresponds to a same luminance compensation level, the compensation parameter in a same luminance compensation level is the same, and the compensation parameter in each luminance compensation level is greater than or equal to zero gray scale and less than a pixel gray scale of the edge pixel.

[0063] In some embodiments of the present application, the compensation parameter of each compensation sub-area gradually decreases along a first direction, where the first direction is a direction from the area where the picture pixels are located to the compensation area.

[0064] On the other hand, an embodiment of the present application provides a display device, which includes the system as described above.

[0065] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0067] Figure 1a and Figure 1b A schematic diagram explaining the principle of the halo phenomenon provided in an embodiment of the present application;

[0068] Figure 2 A flow chart of a brightness adjustment method provided in an embodiment of the present application;

[0069] Figure 3a A schematic diagram of the light zone arrangement of a backlight source provided in an embodiment of the present application;

[0070] Figure 3b for Figure 3a A schematic diagram of pixel arrangement in a pixel area corresponding to one of the light areas;

[0071] Figure 4a A schematic diagram of the light zone status of a backlight source provided in an embodiment of the present application;

[0072] Figure 4b for Figure 4a Schematic diagram of the halo phenomenon in the pixel area corresponding to the light area shown;

[0073] Figure 5a A schematic diagram of the light zone states of another backlight source provided in an embodiment of the present application;

[0074] Figure 5b for Figure 5a Schematic diagram of halo improvement effect of pixel area corresponding to the light area shown;

[0075] Figure 6 The luminance test chart of the lamp area before and after the brightness adjustment provided by the embodiment of the present application;

[0076] Figure 7a The backlight source provided by the embodiment of the present application is arranged in 4*4 lamp areas;

[0077] Figure 7b For Figure 7a The schematic diagram of the pixel area corresponding to the backlight source shown in the figure;

[0078] Figure 8a The structural schematic diagram of a brightness adjustment system provided by the embodiment of the present application;

[0079] Figure 8b The structural schematic diagram of another brightness adjustment system provided by the embodiment of the present application. Specific embodiments

[0080] The technical solutions in the embodiments of the present application will be described clearly and completely below with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0081] Unless otherwise required by the context, throughout the specification and claims, the term "comprising" is to be interpreted as open, inclusive, meaning "including, but not limited to". In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "example", "specific example" or "some examples" are intended to mean that the specific feature, structure, material or characteristic related to the embodiment or example is included in at least one embodiment or example of the present application. The illustrative representation of the above terms does not necessarily mean the same embodiment or example. In addition, the specific features, structures, materials or characteristics described can be included in any one or more embodiments or examples in any appropriate manner.

[0082] In the embodiments of the present application, "first", "second", etc. are used to distinguish the same items or similar items with basically the same function and role, only for the purpose of clearly describing the technical solutions of the embodiments of the present application, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features.

[0083] In related art, for low-contrast display devices with local dimming functions, when a certain area of ​​the display screen is illuminated while other areas are off, some light from the illuminated area can leak through the off area, resulting in a "halo" phenomenon. This halo surrounds the illuminated area, significantly reducing the display quality of the display device. It should be noted that the local dimming function is achieved by controlling the backlight source in different zones.

[0084] For a display device with a local dimming function, the display device includes a backlight module and a display panel. If the backlight source of the backlight module is divided into five areas, the five areas can be controlled separately; when the third area (Area 3) in the backlight source is lit and the other areas are off, in an ideal case, reference Figure 1a As shown in FIG, the light intensity measured at the position of the display panel corresponding to the third area (Area3) is 1, and the light intensity measured in other areas is 0; however, in actual applications, due to the light leakage of the display panel, the reference Figure 1b As shown, the light intensity at the position of the display panel corresponding to the third area (Area3) is weakened, and the positions of the display panels corresponding to other areas adjacent to the third area (Area3) show a certain brightness. When the average brightness of the display device is low, a halo phenomenon gradually spreads from the third area (Area3) to the surrounding areas, which reduces the display effect. Figure 1a and Figure 1b The horizontal axis represents the different areas corresponding to the backlight source, and the vertical axis represents the light intensity (Intensity).

[0085] It should be noted that the situation where the average brightness of the display device is low includes the situation where a local area of ​​the display screen is white and most areas are black. In this case, the "halo" phenomenon is more obvious.

[0086] Currently, there are two methods in the related art to mitigate the "halo" phenomenon: First, by improving the design of the display device and increasing the contrast of the display device, thereby reducing light leakage in the unlit area, thereby achieving the effect of reducing the "halo" phenomenon. Second, by reducing the size of each partition in the backlight source, increasing the number of backlight partitions, and controlling the backlight through partitions, the brightness difference between the backlight partition corresponding to the white screen and the backlight partition corresponding to the adjacent black screen is reduced, thereby reducing the "halo" phenomenon. However, the improvement methods in the related art are technically difficult and costly.

[0087] Based on this, an embodiment of the present application provides a brightness adjustment method, which is applied to a display device, wherein the display device includes a backlight module. Figure 2 As shown, the adjustment method includes:

[0088] S101, divide the backlight source of the backlight module into a plurality of lamp areas;

[0089] For example, the backlight source can be divided into 9 lamp areas, 16 lamp areas or 25 lamp areas. For each lamp area after division, its state can be controlled individually, for example, a lamp area is controlled to be in a lighting state or an extinguishing state; or its brightness can be controlled individually, for example, the brightness of a lamp area is increased or decreased.

[0090] Figure 3a A schematic diagram of dividing the backlight source of the backlight module into 16 lamp areas is shown as follows, Figure 3a Each square in the diagram represents a lamp area.

[0091] Here, the type of the backlight module is not limited. In some embodiments, the backlight module can be an LED (Light Emitting Diode) backlight module, or can be a Mini LED (Mini Light Emitting Diode) backlight module.

[0092] For example, each lamp area can include at least one LED lamp, or at least one Mini LED lamp.

[0093] In some embodiments, the Mini LED backlight module can be an AM Mini LED (Active Matrix Mini Light Emitting Diode) backlight module; or the Mini LED backlight module can be a PM Mini LED (Passive Matrix Mini Light Emitting Diode) backlight module.

[0094] S102, obtain the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source;

[0095] Figure 3b A schematic diagram of the pixel arrangement in the pixel area corresponding to one of the lamp areas in Figure 3a For example, the pixel area corresponding to one lamp area includes 5*5 arranged pixels as shown in Figure 3b

[0096] The maximum gray scale value of a lamp area means the maximum pixel gray scale value in the pixel area corresponding to the lamp area. The maximum gray scale value of the backlight source means the maximum pixel gray scale value in the pixel area corresponding to all lamp areas of the backlight source.

[0097] In actual application, the pixel gray scale value can be obtained by a time sequence controller (TCON).​

[0098] S103, obtaining a first brightness parameter of each lamp area according to the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source;

[0099] The first brightness parameter is determined by the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source, and each lamp area corresponds to a first brightness parameter.

[0100] S104, obtaining a second brightness parameter according to each first brightness parameter;

[0101] The second brightness parameter is determined by all the first brightness parameters, and the backlight module corresponds to only one second brightness parameter in the process of adjusting the brightness of the backlight module once. It can be understood that the second brightness parameters corresponding to all the lamp areas are the same.

[0102] S105, adjusting the brightness of each lamp area according to the second brightness parameter.

[0103] It should be noted that the process of adjusting the brightness of each lamp area is determined by the initial brightness of each lamp area and the second brightness parameter. Specifically, for the lamp area in the initial state of extinguishing, the brightness of the lamp area is still in the extinguishing state after the brightness adjustment; for the lamp area in the initial state of lighting, the brightness of the lamp area after adjustment is determined by the initial brightness and the second brightness parameter.

[0104] In the embodiments of the present application, although the maximum pixel gray scale value in the pixel area corresponding to the lamp area is obtained in the process of adjusting the brightness, the brightness of each lamp area in the backlight source is finally adjusted. For example, in the Mini LED backlight module, the brightness is adjusted by adjusting the anode voltage corresponding to each Mini LED light emitting chip.

[0105] In the adjusting method provided in the embodiments of the present application, the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source are obtained; a plurality of first brightness parameters are obtained according to the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source, a second brightness parameter is obtained according to the plurality of first brightness parameters, and the brightness of each lamp area is adjusted according to the second brightness parameter and the initial brightness of each lamp area, so as to reduce the brightness difference between the pixel area corresponding to the lamp area in the lighting state and the pixel area corresponding to the lamp area in the extinguishing state, thereby reducing the "halo" problem caused by the light leakage of the display panel, and further improving the display effect of the display device prepared by the backlight module.

[0106] In some embodiments of the present application, step S105, adjusting the brightness of each lamp area according to the second brightness parameter, comprises:

[0107] S1051, updating the brightness value of the light region in the light-on state; the updated brightness value is equal to the initial brightness value of the light region in the light-on state multiplied by the second brightness parameter;

[0108] The initial brightness value of the light region in the light-on state can be an actually measured brightness value, or can also be a pixel gray scale value corresponding to the brightness.

[0109] The second brightness parameter is a unitless adjustment parameter, and the second brightness parameter is determined by the plurality of first brightness parameters; the second brightness parameter is greater than 0 and less than 1.

[0110] S1052, keeping the light region in the light-off state.

[0111] In some embodiments of the present application, step S103, obtaining the first brightness parameter of each light region according to the maximum gray scale value of each light region and the maximum gray scale value of the backlight source includes:

[0112] S1031, dividing the maximum gray scale value of each light region by the maximum gray scale value of the backlight source to obtain a plurality of first brightness parameters same as the number of light regions.

[0113] The first brightness parameter is a unitless adjustment parameter, and it can be understood that the first brightness parameter is the ratio of the maximum gray scale value of the light region to the maximum gray scale value of the backlight source.

[0114] The first brightness parameter is greater than or equal to 0 and less than or equal to 1. When the light region is in the light-off state, the maximum gray scale value of the light region is 0, and the first brightness parameter corresponding to the light region is equal to 0; when the maximum gray scale value of the light region is equal to the maximum gray scale value of the backlight source, the first brightness parameter corresponding to the light region is equal to 1.

[0115] In some embodiments of the present application, step S104, obtaining the second brightness parameter according to each first brightness parameter includes:

[0116] S1041, averaging each first brightness parameter to obtain the second brightness parameter.

[0117] Since the first brightness parameter is a unitless adjustment parameter, and the second brightness parameter is the average of the first brightness parameters of each light region, the second brightness parameter is also a unitless adjustment parameter.

[0118] The first brightness parameter is greater than or equal to 0 and less than or equal to 1. Since the adjusting method of the present application aims to improve the halo problem in the pixel area corresponding to the lamp area when part of the lamp areas are on and part of the lamp areas are off, there is no halo problem when all the lamp areas are on or all the lamp areas are off. Therefore, there is no case where the first brightness parameter of each lamp area is 0, and there is also no case where the first brightness parameter of each lamp area is 1. Therefore, it can be determined that the second brightness parameter is greater than 0 and less than 1.

[0119] In some embodiments of the present application, after the backlight is divided into multiple lamp areas in step S101, and before the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight are obtained in step S102, the method further comprises:

[0120] S106, determining a third brightness parameter of the lamp area;

[0121] S107, adjusting the brightness of each lamp area when the third brightness parameter exceeds a preset value.

[0122] The third brightness parameter is a parameter for measuring the overall brightness of all lamp areas. When the third parameter exceeds the preset value, the brightness of the lamp area in the on state is adjusted according to the brightness adjusting method described above.

[0123] In some embodiments of the present application, the preset value is less than or equal to 30%.

[0124] For example, the preset value can be 30%, or the preset value can be 25%.

[0125] It should be noted that when the overall brightness of all lamp areas is high, the overall brightness of the pixel area corresponding to each lamp area is high, and at this time, the "halo" phenomenon in the pixel area corresponding to the lamp area in the off state is not easy to be perceived by the human eye, and the influence on the display effect of the display device can be ignored. When the overall brightness of all lamp areas is low, the overall brightness of the pixel area corresponding to each lamp area is low, and at this time, the "halo" phenomenon in the pixel area corresponding to the lamp area in the off state is more obvious and more easily perceived by the human eye. Therefore, the brightness adjusting method provided by the embodiments of the present application mainly aims at the case where the overall brightness of all lamp areas is low.

[0126] In addition, it can be understood that the "halo" phenomenon is the influence of the light area in the lighting state on the pixel area corresponding to the light area in the extinguishing state, and the position where the "halo" phenomenon is more obvious is in the pixel area corresponding to the light area in the extinguishing state. The brightness adjustment method provided by the embodiments of the present application adjusts the brightness of the light area in the lighting state in the backlight module, thereby reducing the influence of the light area in the lighting state on the pixel area corresponding to the light area in the extinguishing state, and further reducing the "halo" phenomenon in the pixel area corresponding to the light area in the extinguishing state.

[0127] In some embodiments of the present application, the step S106 of determining the third brightness parameter of the light area comprises:

[0128] S1061, obtaining the maximum gray scale value of each light area and the maximum gray scale value of the backlight source;

[0129] The maximum gray scale value of the light area means the maximum pixel gray scale value in the pixel area corresponding to each light area. The maximum gray scale value of the backlight source means the maximum pixel gray scale value in the pixel area corresponding to all light areas of the backlight source.

[0130] S1062, obtaining the average value of the maximum gray scale value of each light area according to the maximum gray scale value of each light area;

[0131] S1063, determining the third brightness parameter according to the average value of the maximum gray scale value of each light area and the maximum gray scale value of the backlight source.

[0132] The average value of the maximum gray scale value of each light area can represent the average brightness of the backlight source of the backlight module; the maximum gray scale value of the backlight source can represent the maximum brightness of the backlight source of the backlight module; and the ratio obtained by dividing the average value of the maximum gray scale value of each light area by the maximum gray scale value of the backlight source is used to measure whether the brightness of each light area needs to be adjusted.

[0133] For example, when the ratio is greater than a preset value, no brightness adjustment is performed; and when the ratio is less than or equal to the preset value, the brightness adjustment method provided by the embodiments of the present application is used to adjust the brightness of each light area.

[0134] In some embodiments of the present application, the preset value is less than or equal to 30%.

[0135] For example, the preset value can be 30%, or the preset value can be 25%.

[0136] It should be noted that in the case that the overall brightness of all the lamp areas is high, the overall brightness of the pixel area corresponding to each lamp area is high, at this time, the "halo" phenomenon in the pixel area corresponding to the lamp area in the off state is not easy to be perceived by the human eye, and the influence on the display effect of the display device is almost negligible. In the case that the overall brightness of all the lamp areas is low, the overall brightness of the pixel area corresponding to each lamp area is low, at this time, the "halo" phenomenon in the pixel area corresponding to the lamp area in the off state is more obvious, and is more easily perceived by the human eye. Therefore, the brightness adjustment method provided by the embodiment of the present application is mainly aimed at the case that the overall brightness of all the lamp areas is low.

[0137] The following takes the backlight source shown in FIG. 1 as an example, which includes 4*4 lamp areas, to illustrate how to improve the halo problem through the brightness adjustment method of the present application. Among them, Figure 4a FIG. 1 is a schematic diagram of the backlight source, and the part marked E is the lamp area in the off state, and the part marked L is the lamp area in the on state. Figure 4a FIG. 2 is a pixel area corresponding to the lamp area shown in FIG. 1. Specifically as follows: Figure 4b Figure 4a The backlight module is divided into a plurality of lamp areas shown in FIG. 1.

[0138] Figure 4a The maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source are obtained.

[0139] The average value of the maximum gray scale value of each lamp area is obtained according to the maximum gray scale value of each lamp area. Figure 4a The third brightness parameter is determined according to the average value of the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source, and the subsequent steps are performed in the case that the third brightness parameter is less than the preset value. The preset value can be set to 30%.

[0140] Referring to FIG. 2, it can be seen that in the case that the third brightness parameter is less than the preset value, Figure 4b the pixel area shown in FIG. 2 presents obvious "halo" phenomenon, which seriously reduces the display effect. Figure 4b

[0141] It should be noted that the "halo" phenomenon can be understood as a halo of light rays from bright to dark around the center region of the pixel area corresponding to the four lamp areas in the on state, in Figure 4b which is simply illustrated by a circle.

[0142] The pixel area corresponding to the lamp area refers to the pixel area in the display panel, the orthographic projection of which on the backlight module falls into the lamp area.

[0143] The maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source are obtained.The maximum gray scale value of each lamp area is divided by the maximum gray scale value of the backlight source to obtain a plurality of first brightness parameters which are the same as the number of lamp areas.​

[0144] It can be understood that the first luminance parameter is the ratio of the maximum gray scale value of the lamp region and the maximum gray scale value of the backlight. The first luminance parameter is greater than or equal to 0 and less than or equal to 1. When the lamp region is in an off state, the maximum gray scale value of the lamp region is 0, and the first luminance parameter corresponding to the lamp region is equal to 0; when the maximum gray scale value of the lamp region is equal to the maximum gray scale value of the backlight, the first luminance parameter corresponding to the lamp region is equal to 1.

[0145] The average of each first luminance parameter is obtained to obtain a second luminance parameter.

[0146] For example: Figure 4a In the 4*4 lamp regions shown in FIG. 4, the first luminance parameters of the 4 lamp regions L in the on state are all 40%; the first luminance parameters of the 12 lamp regions L in the off state are all 0%, and the second luminance parameter = (40%*4+0%*12) / 16 = 10%.

[0147] For the 4 lamp regions in the on state, the luminance values thereof are updated; the updated luminance value is equal to the initial luminance value of the lamp region in the on state multiplied by the second luminance parameter; for the lamp regions in the off state, the off state is maintained.

[0148] The updated luminance value = initial luminance value*10%.

[0149] The luminance of the 4 lamp regions in the on state shown in FIG. 4 is adjusted to 10% of the initial luminance, to obtain a schematic diagram of the backlight as shown in FIG. 5, Figure 4a The pixel region corresponding to the lamp region of Figure 5a It can be seen that, after the luminance of the lamp region is adjusted, the halo problem in the pixel region corresponding to the lamp region is obviously reduced. Figure 5b Figure 5a The pixel region corresponding to the lamp region of Figure 5b It can be seen that, after the luminance of the lamp region is adjusted, the halo problem in the pixel region corresponding to the lamp region is obviously reduced.

[0150] In some embodiments, if the backlight is divided into 1152 lamp regions, the first luminance parameters corresponding to each of the lamp regions are A1, A2, A3, A4, A5, A6, …, A1152 respectively, and the second luminance parameter is For all the lamp regions in the on state,

[0151] If only one lamp region of the 1152 lamp regions is in the on state, and the other lamp regions are in the off state, the first luminance parameter corresponding to the lamp region in the on state is 100%, and the second luminance parameter is For the one lamp region in the on state, the updated luminance value (Renew) = initial luminance value (Initial)*8.68%. Figure 6 ​The initial luminance and the luminance curve after the luminance adjustment method of the present application is adopted are shown, wherein the abscissa of the curve is wavelength and the ordinate is luminance.

[0152] In some embodiments of the present application, the display device further comprises a display panel, the display panel is located at the light emitting side of the backlight module;

[0153] After the step S105, the method further comprises:

[0154] S108, determining a compensation area of the display panel according to the lighted lamp areas;

[0155] The compensation area of the display panel refers to: determining the edge pixels of the picture pixels according to the display picture corresponding to the lighted lamp areas, and then determining the part of the pixels other than the picture pixels corresponding to the lighted lamp areas according to the edge pixels.

[0156] It should be noted that the picture pixels refer to the pixels that are being used to display the picture, that is, when the local area of the display panel displays the picture and the remaining area is black, the pixels located in the area that is displaying the picture can be referred to as picture pixels. For example, Figure 7a The backlight source is divided into 4*4 lamp areas, Figure 7b As shown in the figure, Figure 7a As shown in the figure, the pixel area corresponding to the backlight source includes 25 pixels in the pixel area corresponding to each lamp area, Figure 7b The area marked PP in the figure is the area of the display picture, and the pixels in this area are referred to as picture pixels.

[0157] The picture pixels include edge pixels, wherein the edge pixels are the pixels located at the edge of the white area (the area of the display picture) at the black-white junction; the black-white junction refers to the junction of the area of the display picture and the black state area. For example, Figure 7b As shown in the figure, the pixels marked "△ and ▲" in the picture pixels are edge pixels.

[0158] It can be understood that the compensation area is the area of the other pixels other than the picture pixels in the pixel area corresponding to the lighted lamp area. The orthographic projection of the area of the other pixels on the backlight module is located in the lighted lamp area, and the orthographic projection of the area of the other pixels on the backlight module and the orthographic projection of the picture pixels on the backlight module do not overlap. In addition, the pixel area corresponding to the lamp area refers to: in the display panel, the orthographic projection on the backlight module falls into the pixel area corresponding to the lamp area.

[0159] S109, determining a compensation parameter of the compensation area;

[0160] The compensation area corresponding to an edge pixel includes at least one compensation parameter. Before determining the compensation parameter, the compensation area is divided into at least one compensation sub-area, each compensation sub-area corresponding to a compensation parameter; the compensation parameters of each compensation sub-area are different, and the compensation parameters of each compensation sub-area gradually decrease along a first direction, where the first direction is the direction from the area where the picture pixel is located to the compensation area.

[0161] In the case that the compensation area includes only one compensation sub-area, the compensation parameter of the compensation sub-area is zero grayscale.

[0162] When the compensation area includes multiple compensation sub-areas, one compensation sub-area corresponds to a brightness compensation level, one brightness compensation level corresponds to a pixel grayscale value, and the pixel grayscale values ​​corresponding to each brightness compensation level are greater than or equal to zero grayscale and less than the grayscale value of the edge pixel corresponding to the compensation area.

[0163] Among them, edge pixels refer to pixels located at the edge of the white area at the black-white boundary; the black-white boundary refers to the boundary between the display area and the black area. Figure 7b As shown, the area marked PP is the area of ​​the display screen, which includes a plurality of screen pixels, and the pixels marked “△” and “▲” are edge pixels.

[0164] S110: Adjust the brightness of the compensation area according to the compensation parameters.

[0165] The brightness adjustment method provided in the embodiments of the present application can also determine a compensation area based on the lamp area in the lit state. The compensation area is the area where some other pixels except the screen pixels are located in the pixel area corresponding to the lamp area in the lit state; by adjusting the brightness of the pixels in the compensation area to different degrees, the halo phenomenon can be further alleviated, the display effect of the display device can be improved, and the picture quality can be improved.

[0166] In some embodiments, step S108, determining the compensation area of ​​the display panel according to each lamp area in the lit state, includes:

[0167] S1081, determining the display screen on the display panel corresponding to each light zone in the lit state;

[0168] For example, Figure 7a The backlight source is divided into 4*4 light zones. Figure 7b for Figure 7a The pixel area corresponding to the backlight source shown in the figure includes 25 pixels in the pixel area corresponding to each light area. Figure 7b The area marked PP in the middle is the area where the picture is displayed, and the pixels in this area are called picture pixels.

[0169] S1082, determining edge pixels of each light area according to the picture pixels in the display picture;

[0170] wherein, the edge pixel is a pixel located at the edge of the white region at the black-white junction; the black-white junction refers to the junction of the display picture region and the black state region. It is referred to Figure 7b As shown in the figure, the pixels marked with "△ and ▲" in the picture pixels are edge pixels.

[0171] S1083, determining the number of picture pixels;

[0172] Here, the specific way of determining the number of picture pixels is not limited.

[0173] S1084, determining the compensation area of each edge pixel according to the number of picture pixels; wherein, the compensation area is the area where the other pixels except the picture pixels in the pixels corresponding to the light area in the lighting state are located.

[0174] It can be understood that the orthographic projection of the compensation area on the backlight module is located in the light area in the lighting state, and the orthographic projection of the compensation area on the backlight module and the orthographic projection of the picture pixels on the backlight module do not overlap.

[0175] It is referred to Figure 7b As shown in the figure, since the display picture is located in the pixel region corresponding to the light area 6, the light area 7, the light area 10 and the light area 11, each compensation area is also located in the pixel region corresponding to the light area 6, the light area 7, the light area 10 and the light area 11, and the pixels in the compensation area do not include the picture pixels.

[0176] It should be noted that each edge pixel corresponds to a compensation area, and the compensation areas corresponding to all edge pixels in the picture pixels jointly form a buffer area, and the pixels in the buffer area are arranged around the picture pixels.

[0177] In addition, when determining the compensation area, a dynamic parameter X is also involved, and the number of pixels included in each compensation area can be determined according to the number of picture pixels and the dynamic parameter X.

[0178] In some embodiments, the dynamic parameter X is related to the contrast of different models of display devices, and in actual application, the higher the contrast, the smaller the dynamic parameter X can be.

[0179] In some embodiments, the dynamic parameter X is related to the area of the outer expansion area of the halo, and the larger the area of the outer expansion area of the halo, the larger the dynamic parameter X can be. It should be noted that, for example, Figure 5b The area of the outer expansion area of the halo is the area of the oval halo minus the area of the pixel region corresponding to the four light areas in the lighting state, and the outer expansion area of the halo is actually a ring-shaped area.

[0180] It should be noted that, in practical applications, when the brightness of the compensation area is adjusted, what is actually changed is the pixel electrode voltage of each pixel in the compensation area.

[0181] The following example illustrates how to determine the compensation area:

[0182] If the number of picture pixels is 200 and the dynamic parameter X is set to 20%, the number of pixels included in the compensation area corresponding to each edge pixel = 200*20% = 40.

[0183] refer to Figure 7b As shown, the picture pixels ( Figure 7b The number of pixels in the area marked PP in the figure is 16. When the dynamic parameter X is set to 12.5%, the number of pixels included in the compensation area corresponding to each edge pixel is 16*12.5%=2. Figure 7b The compensation area of ​​the edge pixels marked with "▲" is marked as B. When the number of brightness compensation energy levels is 5 or 6, since the number of pixels in compensation area B is less than the number of brightness compensation energy levels, the two pixels in compensation area B can be directly black-inserted.

[0184] When the dynamic parameter X is set to 18.75%, the number of pixels included in the compensation area corresponding to each edge pixel = 16*18.75% = 3. Figure 7b Mark The edge pixels of the compensation area are marked as C. When the number of brightness compensation energy levels is 5 or 6, since the number of pixels in compensation area C is less than the number of brightness compensation energy levels, the two pixels in compensation area C can be directly black-inserted.

[0185] The black insertion process can be understood as adjusting the grayscale of the pixel to the L0 grayscale.

[0186] The compensation areas of other edge pixels are determined in a similar manner to that of this edge pixel. The compensation areas corresponding to all edge pixels together constitute a buffer zone, and the pixels in the buffer zone are arranged around the picture pixels.

[0187] It should be noted that, in the embodiments of the present application, the arrangement of pixels in the compensation area or the arrangement of pixels in the compensation sub-area is not further limited and is determined based on actual conditions.

[0188] In some embodiments, step S109, determining compensation parameters of the compensation area, includes:

[0189] S1091, determining the number of pixels in the compensation area;

[0190] S1092: When the number of pixels in the compensation area is less than the number of brightness compensation levels, the compensation parameter of the compensation area is determined to be zero grayscale;

[0191] For example, if the number of pixels in the compensation area is 5 and the number of brightness compensation levels is 6, the compensation parameters of each pixel in the compensation area are set to zero gray scale (L0); if the number of pixels in the compensation area is 4 and the number of brightness compensation levels is 5, the compensation parameters of each pixel in the compensation area are set to zero gray scale (L0).

[0192] When performing brightness compensation or brightness adjustment, the brightness adjustment process is divided into multiple brightness compensation levels according to different brightness adjustment amplitudes; different brightness compensation levels have different degrees of brightness adjustment.

[0193] The more the number of brightness compensation levels, the more delicate the brightness adjustment process of each pixel in the compensation area, and the better the display quality of the display picture after brightness adjustment. In actual application, the number of brightness compensation levels is related to the number of pixels included in the compensation area, and can be adjusted according to actual conditions, which is not limited here.

[0194] In addition, the number of brightness compensation levels is related to the processing precision of the quality engine.

[0195] For example: for a display device using SDR (Standard Dynamic Range, ordinary dynamic range) technology, the processing precision of the quality engine is 8 bits, and the gray scale of the picture includes 2 8 = 256 levels, i.e. L0, L1, L2, L3……L254 and L255, and the number of brightness compensation levels can include up to 256.

[0196] For a display device using HDR (High-Dynamic Range, high dynamic range) technology, the processing precision of the quality engine is 10 bits, and the gray scale of the picture includes 2 10 = 1024 levels, i.e. L0, L1, L2, L3……L1022 and L1023, and the number of brightness compensation levels can include up to 1024.

[0197] It should be noted that the HDR (High-Dynamic Range) technology is relative to the SDR (Standard Dynamic Range) technology. For the display device of the SDR technology, the brightness range of the display device is 200-300 nits, the contrast is about 500:1 to 4000:1 due to different display modes, and the internal picture quality engine processing precision is 8 bits. However, for the display device of the HDR1000 technology (the HDR1000 technology is a type of HDR technology), the brightness requirement of the display device is: the central white picture of 10% requires brightness ≥1000 nits, and the edge black state brightness is ≤0.05 nits; the internal picture quality engine processing precision is 10 bits.

[0198] S1093, in a case where the number of pixels in the compensation area is greater than or equal to the number of brightness compensation levels, the compensation area is divided into a plurality of compensation sub-areas, and the number of compensation sub-areas is the same as the number of brightness compensation levels;

[0199] In the same compensation sub-area, the pixels correspond to the same brightness compensation level, the compensation parameters in the same brightness compensation level are the same, and the compensation parameters in each brightness compensation level are greater than or equal to the zero gray scale and less than the pixel gray scale of the edge pixel.

[0200] In addition, in the plurality of brightness compensation levels, the compensation parameter of one of the brightness compensation levels is zero gray scale; and the compensation parameters of each compensation sub-area gradually decrease along a first direction, and the first direction is a direction in which the area where the pixels are located points to the compensation area.

[0201] For example, the compensation area can be divided into 3, 4, 5, 6 or more compensation sub-areas, and the number of compensation sub-areas is the same as the number of brightness compensation levels.

[0202] It can be understood that the more the number of compensation sub-areas divided by each compensation area, the more delicate the brightness adjustment process, and the better the picture quality of the picture displayed in the pixel area after brightness adjustment.

[0203] For example, for the display device of the HDR technology, since the internal picture quality engine processing precision is 10 bits, the gray scale of the picture includes 2 10 1024 levels, i.e. L0, L1, L2, L3……L1022 and L1023 gray scales, and the number of brightness compensation levels can include 1024 at most. Table 1 provides a compensation parameter table with 6 brightness compensation levels.

[0204] In the case that the pixel number of the compensation area corresponding to the edge pixel is 27, and the number of the luminance compensation ranks is 6, the compensation area is divided into 6 compensation sub-areas, 27 ÷ 6 = 4 (with a remainder of 3), then:

[0205] Table 1: Compensation parameter table of the first luminance compensation rank

[0206]

[0207] The first compensation sub-area includes 4 pixels, the corresponding luminance compensation rank is 5, and the corresponding compensation parameter is L900;

[0208] The second compensation sub-area includes 4 pixels, the corresponding luminance compensation rank is 4, and the corresponding compensation parameter is L700;

[0209] The third compensation sub-area includes 4 pixels, the corresponding luminance compensation rank is 3, and the corresponding compensation parameter is L500;

[0210] The fourth compensation sub-area includes 4 pixels, the corresponding luminance compensation rank is 2, and the corresponding compensation parameter is L300;

[0211] The fifth compensation sub-area includes 4 pixels, the corresponding luminance compensation rank is 1, and the corresponding compensation parameter is L100;

[0212] The sixth compensation sub-area includes 4 + 3 (remainder) pixels, the corresponding luminance compensation rank is 0, and the corresponding compensation parameter is L0.

[0213] It should be noted that the gray scale corresponding to the lowest luminance compensation rank (Rank 0) is L0 gray scale, the gray scale corresponding to the highest luminance compensation rank (Rank 5) is less than the pixel gray scale of the edge pixel, and the gray scale corresponding to the other luminance compensation ranks is between the two gray scales, which can be adjusted according to actual conditions.

[0214] Table 2: Compensation parameter table in the second luminance compensation rank

[0215]

[0216] For example, for a display device of SDR technology, since the internal picture quality engine processing precision is 8 bits, the gray scale of the picture includes 2 8 = 256 levels, i.e., L0, L1, L2, L3, …, L254 and L255 gray scales, and the number of luminance compensation ranks can include 256 at most, and Table 2 provides a compensation parameter table in which the number of luminance compensation ranks is 5.

[0217] In the case that the pixel number of the compensation area corresponding to the edge pixel is 27, the compensation area is divided into 5 compensation sub-areas, 27 ÷ 5 = 5 (with a remainder of 2), then:

[0218] The first compensation sub-area includes 5 pixels, the corresponding brightness compensation level is 4, and the corresponding compensation parameter is L200;

[0219] The second compensation sub-area includes 3 pixels, the corresponding brightness compensation level is 3, and the corresponding compensation parameter is L150;

[0220] The third compensation sub-area includes 5 pixels, the corresponding brightness compensation energy level is 2, and the corresponding compensation parameter is L100;

[0221] The fourth compensation sub-area includes 5 pixels, the corresponding brightness compensation energy level is 1, and the corresponding compensation parameter is L50;

[0222] The fifth compensation sub-area includes 5+2 (remainder) pixels, the corresponding brightness compensation energy level is 0, and the corresponding compensation parameter is L0.

[0223] It should be noted that the grayscale corresponding to the lowest brightness compensation energy level (Rank 0) is the L0 grayscale, the grayscale corresponding to the highest brightness compensation energy level (Rank 4) is smaller than the pixel grayscale of the edge pixels, and the grayscales corresponding to other brightness compensation energy levels are between these two grayscales and can be adjusted according to actual conditions.

[0224] In addition, it should be emphasized that when the number of pixels in the compensation area is less than the number of brightness compensation levels, the compensation parameter of the compensation area is determined to be zero grayscale, that is, at this time, all pixels in the compensation area are black-inserted. When the number of pixels in the compensation area is greater than or equal to the number of brightness compensation levels, all pixels in the compensation sub-area corresponding to the brightness compensation level of 0 in multiple compensation sub-areas are black-inserted (L0 grayscale), and as the brightness compensation level gradually decreases (grayscale value decreases), the corresponding compensation sub-area is farther away from the area where the picture pixels are located; for all pixels in the compensation sub-area with the largest brightness compensation level, the grayscale value corresponding to its compensation parameter is less than the grayscale value of the edge pixel.

[0225] In practical applications, since HDR display devices have higher requirements for brightness and image quality, when adjusting the brightness of the backlight source in an HDR display device, each compensation area can usually be divided into a larger number of compensation sub-areas, so that the brightness of each compensation sub-area can be adjusted separately to meet the higher image quality requirements of the HDR display device.

[0226] Exemplary, reference Figure 7b As shown in FIG, when the number of pixels in the compensation area is greater than or equal to the number of brightness compensation levels, the brightness compensation levels corresponding to each compensation sub-area are arranged along the same direction. Figure 7b The direction of the arrow shown gradually decreases (grayscale value decreases).

[0227] In actual application, each edge pixel corresponds to a compensation area including at least one compensation sub-area, and each compensation sub-area includes at least one pixel. The specific arrangement of the pixels in each compensation sub-area can be determined according to the number of pixels included in the actual compensation area and the severity of the light halo, which is not limited here.

[0228] The brightness adjustment method provided by the embodiments of the present application can determine a compensation area according to a light area in a lighting state. In a case where the number of pixels in the compensation area is less than the number of brightness compensation levels, all pixels in the compensation area are directly subjected to black insertion processing. In a case where the number of pixels in the compensation area is greater than or equal to the number of brightness compensation levels, the compensation area is divided into multiple compensation sub-areas, and the pixels in each compensation sub-area are subjected to brightness adjustment of different degrees, so that the light halo phenomenon can be further reduced, the display effect of the display device can be improved, and the image quality can be improved.

[0229] The embodiments of the present application provide a brightness adjustment system, as shown in Figure 8a The system includes a controller 400 and a backlight module 500 which are electrically connected.

[0230] The backlight module 500 is configured to provide a backlight source under the control of the controller 400.

[0231] The controller 400 includes a partition dimming unit 402 and a control unit 401. The control unit 401 and the partition dimming unit 402 are electrically connected, and the partition dimming unit 402 and the backlight module 500 are electrically connected.

[0232] The partition dimming unit 402 is configured to divide the backlight source into multiple light areas according to a partition control signal sent by the control unit 401 when the partition control signal is received.

[0233] The control unit 401 is configured to obtain and store the maximum gray scale value of each light area and the maximum gray scale value of the backlight source, obtain a first brightness parameter corresponding to each light area according to the maximum gray scale value of each light area and the maximum gray scale value of the backlight source, obtain a second brightness parameter according to each first brightness parameter, send a partition control signal and a dimming signal.

[0234] The partition dimming unit 402 is further configured to obtain the second brightness parameter after receiving the dimming signal, and adjust the brightness of each light area according to the second brightness parameter.

[0235] In the embodiments of the present application, the controller 400 can be a timing controller (TCON), the partition dimming unit 402 can be a local dimming controller (LDC), and the control unit 401 can be a microcontroller unit (MCU).

[0236] In the embodiments of the present application, the backlight module described above can be a Mini LED type backlight module, or can also be a Micro LED type backlight module, which is determined according to actual conditions and is not limited here.

[0237] In the embodiments of the present application, the system further includes a PC motherboard or a video capture card 700, which can be connected with the controller 400 through an EDP interface to transmit a video stream signal to the controller 400, and the video stream signal is subjected to logical operation by various modules in the controller 400, and the obtained luminance signal is transmitted to the backlight module 500 through an SPI interface, so as to control the luminance of the backlight source of the backlight module. In actual application, the controller 400 is electrically connected between the LED driver and the backlight module 500.

[0238] It should be noted that the EDP interface is a fully digital interface based on the DisplayPort architecture and protocol, which can transmit high-resolution signals with a simple connector and fewer pins, and can realize simultaneous transmission of multiple data. SPI (Serial Peripheral Interface) is a synchronous serial peripheral interface, which can enable the MCU to communicate with various peripheral devices in a serial manner to exchange information.

[0239] In the embodiments of the present application, by the above adjustment system, the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source are obtained; a plurality of first luminance parameters are obtained according to the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source, a second luminance parameter is obtained according to the plurality of first luminance parameters, and the luminance of each lamp area is adjusted according to the second luminance parameter and the initial luminance of each lamp area, so as to reduce the luminance difference between the pixel area corresponding to the lamp area in the lighting state and the pixel area corresponding to the lamp area in the extinguishing state, thereby the "halo" problem caused by the light leakage of the display panel can be reduced, and the display effect of the display device prepared by the backlight module can be improved.

[0240] In some embodiments of the present application, the partition light adjustment unit 402 includes a partition subunit and a light adjustment subunit.

[0241] The partition subunit is configured to divide the backlight source into a plurality of lamp areas according to a partition control signal;

[0242] The light adjustment subunit is configured to obtain a second luminance parameter, for the lamp area in the lighting state, update the luminance value thereof according to the second luminance parameter, and the updated luminance value is equal to the initial luminance value of the lamp area in the lighting state multiplied by the second luminance parameter; for the lamp area in the extinguishing state, control it to remain in the extinguishing state.

[0243] In some embodiments of the present application, the control unit 401 comprises a storage subunit, an acquisition subunit, a first operation subunit and a second operation subunit;

[0244] The acquisition subunit is configured to acquire the maximum grayscale value of each light zone and the maximum grayscale value of the backlight source;

[0245] The storage subunit is configured to store the partition control signal, the dimming signal, the maximum grayscale value of each light zone, the maximum grayscale value of the backlight source, the first brightness parameter and the second brightness parameter, and send the partition control signal and the dimming signal;

[0246] The first operation subunit is configured to divide the maximum grayscale value of each light zone by the maximum grayscale value of the backlight source to obtain a plurality of first brightness parameters same as the number of light zones;

[0247] The second operation subunit is configured to average each first brightness parameter to obtain the second brightness parameter.

[0248] In some embodiments of the present application, the control unit 401 further comprises a judgment sub-module;

[0249] The judgment sub-module is configured to determine a third brightness parameter of the light zone and judge whether the third brightness parameter exceeds a preset value;

[0250] In the case where the third brightness parameter exceeds the preset value, the judgment sub-module triggers the storage sub-module to send the dimming signal; the third brightness parameter is the ratio of the average value of the maximum grayscale value of each light zone to the maximum grayscale value of the backlight source.

[0251] In some embodiments of the present application, the preset value is less than or equal to 30%.

[0252] In some embodiments of the present application, with reference to Figure 8b As shown in the figure, the system further comprises a display panel 600 located on the light-emitting side of the backlight module 500, and the display panel 600 and the control unit 401 are electrically connected; the controller 400 further comprises a color compensation unit 403, and the color compensation unit 403 and the control unit 401 are electrically connected;

[0253] The color compensation unit 403 is configured to determine a compensation zone of the display panel according to each light zone in the lighting state, determine a compensation parameter of the compensation zone, and the control unit 401 is further configured to perform brightness adjustment on the compensation zone according to the compensation parameter.

[0254] The color compensation unit 403 can be an accurate color capture (ACC) or an adjust chromaticity coordinate (ACC).

[0255] In actual application, the color compensation unit 403 can also adjust the brightness of each sub-pixel included in the pixel in the pixel area. Specifically, when a pixel includes a red sub-pixel, a green sub-pixel and a blue sub-pixel, the brightness proportion of the red sub-pixel, the green sub-pixel and the blue sub-pixel can be adjusted to adjust the picture color of the display panel as a whole.

[0256] In the embodiments of the present application, after the logic operation related to the brightness adjustment of the video stream signal is performed by each module in the controller 400, the obtained brightness adjustment signal is transmitted to the backlight module 500 through the SPI interface. Specifically, the PC motherboard or the video capture card 700 can be connected with the controller 400 through the EDP interface to transmit the video stream signal to the controller 400, and the logic operation of the video stream signal is performed by each module in the controller 400. The brightness adjustment signal obtained by the operation is transmitted to the display panel 600 through the SPI interface, so as to control the gray scale value of each pixel in the compensation area of the display panel. In actual application, the logic operation of the video stream signal can be performed by each module in the controller 400, and the corresponding signals are transmitted to the backlight module 500 and the display panel 600 through the SPI interface, so as to adjust the brightness of the backlight source and the gray scale value of each pixel in the compensation area of the display panel at the same time. Thus, under the joint action of the two, the halo phenomenon is reduced, and the display effect of the display device is improved.

[0257] In some embodiments of the present application, the color compensation unit 403 includes a first determination sub-unit and a second determination sub-unit.

[0258] The first determination sub-unit is configured to determine the display picture in the display panel corresponding to each light area in the lighting state; determine the edge pixel according to the picture pixel in the display picture; determine the number of picture pixels; and determine the compensation area of each edge pixel according to the number of picture pixels; wherein the compensation area is the area where the other pixels except the picture pixels in the pixels corresponding to the light area in the lighting state are located.

[0259] The second determination sub-unit is configured to determine the number of pixels in the compensation area; in the case that the number of pixels in the compensation area is less than the number of brightness compensation levels, the compensation parameter of the compensation area is determined as zero gray scale; in the case that the number of pixels in the compensation area is greater than or equal to the number of brightness compensation levels, the compensation area is divided into a plurality of compensation sub-areas, and the number of compensation sub-areas is the same as the number of brightness compensation levels.

[0260] Wherein, the pixels in the same compensation sub-area correspond to the same brightness compensation level, the compensation parameters in the same brightness compensation level are the same, and the compensation parameters in each brightness compensation level are greater than or equal to zero gray scale and less than the pixel gray scale of the edge pixel.

[0261] In some embodiments of the present application, the compensation parameters of the compensation sub-regions gradually decrease along a first direction, the first direction being a direction in which a region where the pixels of the picture are located points to the compensation region.

[0262] It should be noted that the process of the adjusting system adjusting the brightness can refer to the embodiments of the brightness adjusting method, and the repeated parts will not be described herein.

[0263] Embodiments of the present application provide a display device, which comprises the system as above.

[0264] The display device can be any product or component with display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator, etc. Other essential components of the display device are understood by those skilled in the art and will not be described herein, and should not be considered as a limitation on the present application. The process of the display device adjusting the brightness can refer to the above specific description of the adjusting system or the embodiments of the brightness adjusting method, and the repeated parts will not be described herein.

[0265] The above merely describes the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A brightness adjustment method, wherein: The application is applied to a display device, which comprises a backlight module and a display panel, the display panel is located on the light emitting side of the backlight module, and the adjusting method comprises: dividing the backlight source of the backlight module into a plurality of lamp areas; obtaining the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source; obtaining the first brightness parameter of each lamp area according to the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source, which comprises: the maximum gray scale value of each lamp area divided by the maximum gray scale value of the backlight source, to obtain a plurality of first brightness parameters which are the same as the number of lamp areas; obtaining the second brightness parameter according to each first brightness parameter, which comprises: averaging each first brightness parameter to obtain the second brightness parameter; adjusting the brightness of each lamp area according to the second brightness parameter; determining the compensation area of the display panel according to each lamp area in the lighting state; determining the compensation parameter of the compensation area; adjusting the brightness of the compensation area according to the compensation parameter.

2. The conditioning method of claim 1, wherein, The adjusting of the brightness of each lamp area according to the second brightness parameter comprises: updating the brightness value of the lamp area in the lighting state; the updated brightness value is equal to the initial brightness value of the lamp area in the lighting state multiplied by the second brightness parameter; maintaining the lamp area in the extinguishing state.

3. The conditioning method of claim 1, wherein, After the backlight source is divided into a plurality of lamp areas, and before the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source are obtained, the method further comprises: determining the third brightness parameter of the lamp area; adjusting the brightness of each lamp area in the case that the third brightness parameter exceeds a preset value.

4. The conditioning method of claim 3, wherein, The determination of the third brightness parameter of the lamp area comprises: obtaining the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source; obtaining the average value of the maximum gray scale value of each lamp area according to the maximum gray scale value of each lamp area; determining the third brightness parameter according to the average value of the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source.

5. The conditioning method of claim 3, wherein, The preset value is less than or equal to 30%.

6. The conditioning method according to any one of claims 1-5, wherein, The determination of the compensation area according to each lamp area in the lighting state comprises: determining the display picture in the display panel corresponding to each lamp area in the lighting state; determining the edge pixel according to the picture pixel in the display picture; determining the number of picture pixels; determining the compensation area of each edge pixel according to the number of picture pixels; wherein the compensation area is the area of other pixels except the picture pixels in the pixels corresponding to the lamp area in the lighting state.

7. The adjustment method according to claim 6, wherein: The determination of the compensation parameter of the compensation area comprises: determining the number of pixels in the compensation area; in the case that the number of pixels in the compensation area is less than the number of brightness compensation levels, the compensation parameter of the compensation area is determined as zero gray scale; In a case where the number of pixels in the compensation region is greater than or equal to the number of the luminance compensation levels, the compensation region is divided into a plurality of compensation sub-regions, and the number of the compensation sub-regions is the same as the number of the luminance compensation levels; wherein the pixels in a same compensation sub-region correspond to a same luminance compensation level, the compensation parameters in a same luminance compensation level are the same, and the compensation parameters in each luminance compensation level are greater than or equal to a zero gray scale and less than a pixel gray scale of the edge pixel.

8. The conditioning method of claim 7, wherein, The compensation parameters of each compensation sub-region gradually decrease along a first direction, and the first direction is a direction in which a region where the picture pixels are located points to the compensation region.

9. A luminance adjustment system, wherein, Comprise: A controller and a backlight module electrically connected, and a display panel located on a light-emitting side of the backlight module; The backlight module is configured to provide a backlight source under the control of the controller; The controller comprises a partition light adjustment unit and a control unit; the control unit and the partition light adjustment unit are electrically connected, and the partition light adjustment unit and the backlight module are electrically connected; The partition light adjustment unit is configured to divide the backlight source into a plurality of lamp regions according to the partition control signal received from the control unit; The control unit is configured to obtain and store the maximum gray scale value of each lamp region and the maximum gray scale value of the backlight source; obtain the first luminance parameter corresponding to each lamp region according to the maximum gray scale value of each lamp region and the maximum gray scale value of the backlight source; obtain the second luminance parameter according to each first luminance parameter; and send the partition control signal and the light adjustment signal; The partition light adjustment unit is further configured to obtain the second luminance parameter after receiving the light adjustment signal, and adjust the luminance of each lamp region according to the second luminance parameter; determine a compensation region of the display panel according to each lamp region in a light-on state; determine a compensation parameter of the compensation region; and adjust the luminance of the compensation region according to the compensation parameter; The control unit comprises a first operation sub-unit and a second operation sub-unit; The first operation sub-unit is configured to divide the maximum gray scale value of each lamp region by the maximum gray scale value of the backlight source to obtain a plurality of first luminance parameters which are the same in number as the lamp regions; The second operation sub-unit is configured to average each first luminance parameter to obtain the second luminance parameter.

10. The system of claim 9, wherein, The partition light adjustment unit comprises a partition sub-unit and a light adjustment sub-unit; The partition sub-unit is configured to divide the backlight source into a plurality of lamp regions according to the partition control signal; The light adjustment sub-unit is configured to obtain the second luminance parameter, update the luminance value of the lamp region in the light-on state according to the second luminance parameter, and the updated luminance value is equal to the initial luminance value of the lamp region in the light-on state multiplied by the second luminance parameter; and control the lamp region in the light-off state to remain in the light-off state.

11. The system of claim 9, wherein, The control unit further comprises a storage sub-unit and an acquisition sub-unit; The acquisition sub-unit is configured to obtain the maximum gray scale value of each lamp region and the maximum gray scale value of the backlight source; The storage subunit is configured to store the partition control signal, the dimming signal, the maximum gray scale value of each lamp area, the maximum gray scale value of the backlight source, the first brightness parameter and the second brightness parameter, and send the partition control signal and the dimming signal.

12. The system of claim 11, wherein, The control unit further comprises a judging submodule; The judging submodule is configured to determine a third brightness parameter of the lamp area, and judge whether the third brightness parameter exceeds a preset value; In the case that the third brightness parameter exceeds the preset value, the judging submodule triggers the storage subunit to send the dimming signal; the third brightness parameter is a ratio of an average value of the maximum gray scale value of each lamp area and the maximum gray scale value of the backlight source.

13. The system of claim 12, wherein, The preset value is less than or equal to 30%.

14. The system of any one of claims 9-13, wherein, The system further comprises a display panel located at a light-emitting side of the backlight module, and the display panel and the control unit are electrically connected; the controller further comprises a color compensation unit, and the color compensation unit and the control unit are electrically connected; The color compensation unit is configured to determine a compensation area of the display panel according to each lamp area in a light-on state; determine a compensation parameter of the compensation area; The control unit is further configured to adjust the brightness of the compensation area according to the compensation parameter.

15. The system of claim 14, wherein, The color compensation unit comprises a first determining submodule and a second determining submodule; The first determining submodule is configured to determine a display picture in the display panel corresponding to each lamp area in a light-on state; determine an edge pixel according to a picture pixel in the display picture; determine the number of the picture pixels; determine the compensation area of each edge pixel according to the number of the picture pixels; wherein the compensation area is an area where other pixels except the picture pixels in the pixels corresponding to the lamp area in a light-on state are located; The second determining submodule is configured to determine the number of pixels in the compensation area; in the case that the number of pixels in the compensation area is less than the number of brightness compensation levels, the compensation parameter of the compensation area is determined as zero gray scale; in the case that the number of pixels in the compensation area is greater than or equal to the number of brightness compensation levels, the compensation area is divided into a plurality of compensation subareas, and the number of the compensation subareas is the same as the number of the brightness compensation levels; wherein the pixels in the same compensation subarea correspond to the same brightness compensation level, the compensation parameters in the same brightness compensation level are the same, and the compensation parameters in each brightness compensation level are greater than or equal to zero gray scale and less than the pixel gray scale of the edge pixel.

16. The system of claim 15, wherein, The compensation parameters of each compensation subarea gradually decrease along a first direction, and the first direction is a direction in which an area where the picture pixels are located points to the compensation area.

17. A display device, wherein, The system comprises any one of the systems of claims 9-16.

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