Brightness adjustment method, brightness adjustment apparatus, and display device

Abstract

A brightness adjustment method, a brightness adjustment apparatus, and a display device. The brightness adjustment method comprises: setting N binding points to divide display brightness values of a display screen into several dimming intervals (S1); regulating the binding points and interpolating brightnesses corresponding to the display brightness values of the dimming intervals (S2); and looking up a mapping table and performing first data mapping on the display brightness values in a portion of the dimming intervals according to the mapping table, wherein the portion of the dimming intervals at least comprise the dimming intervals having the smallest display brightness value and the largest display brightness value (S3).

Description

Brightness adjustment method, brightness adjustment device and display device TECHNICAL FIELD

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

[0002] OLED display screens have advantages such as power saving, high resolution, long panel life, and are widely used in various fields, such as mobile phones, commercial PCs and home PCs, notebook computers and wearable products. In the actual use of OLED display terminals, due to different needs of each user, the screen brightness often needs to be adjusted, that is, dimming, so that the screen brightness is more in line with the needs of the user.

[0003] The current common dimming methods include Gamma dimming, pulse signal dimming (PWM), data remapping dimming, and hybrid dimming using the above dimming methods. The current dimming scheme is prone to color deviation and other conditions. SUMMARY

[0004] The purpose of the present application is to provide a brightness adjustment method with good dimming effect, a brightness adjustment device, a computer readable storage medium and a display device.

[0005] The present application discloses a brightness adjustment method, which comprises:

[0006] Setting N binding points to divide the display brightness value of the display screen into a plurality of dimming intervals;

[0007] Debugging the binding points and interpolating the brightness corresponding to the display brightness value of the dimming interval;

[0008] Finding a mapping table and performing first data mapping on the display brightness value in part of the dimming interval according to the mapping table, and part of the dimming interval at least includes the dimming interval with the minimum display brightness value and the maximum display brightness value.

[0009] In some optional embodiments, the brightness adjustment method further comprises:

[0010] Finding a mapping table and performing first data mapping on the display brightness value in all the dimming intervals according to the mapping table.

[0011] In some optional embodiments, the brightness adjustment method further comprises:

[0012] detecting whether the display brightness value is on a predetermined gamma curve, and if the display brightness value is not on the predetermined gamma curve, performing second data mapping on the display brightness value to map the display brightness value onto the predetermined gamma curve.

[0013] In some optional embodiments, the predetermined gamma curves of different light adjustment intervals are different when detecting whether the display brightness value is on the predetermined gamma curve.

[0014] In some optional embodiments, the number of the binding points is three, i.e., a first binding point, a second binding point and a third binding point; the display brightness values corresponding to the first binding point, the second binding point and the third binding point decrease in turn; and the first binding point corresponds to the largest display brightness value.

[0015] In some optional embodiments, the brightness adjustment method further comprises:

[0016] finding the mapping ratio in the mapping table to make the brightness of the a-th binding point after mapping equal to the brightness corresponding to the b-th binding point, b

[0017] In some optional embodiments, the brightness adjustment method further comprises:

[0018] performing pulse signal light adjustment and gamma combined light adjustment on the light adjustment interval between the second binding point and the third binding point.

[0019] In some optional embodiments, the pulse signal duty cycles of at least two of the light adjustment intervals are different.

[0020] In some optional embodiments, the pulse signal duty cycles increase in turn from the light adjustment interval with a low display brightness value to the light adjustment interval with a high display brightness value.

[0021] In some optional embodiments, the mapping ratios of different light adjustment intervals are different.

[0022] The application also discloses a brightness adjustment device, which comprises:

[0023] a preset module, which divides the display brightness value of a display screen into N light adjustment intervals by setting N binding points;

[0024] a gamma module, which performs interpolation on the brightness corresponding to the display brightness value of the light adjustment interval according to the binding points;

[0025] The first mapping module is preset with a mapping table, and the first mapping module performs first data mapping on the display brightness value in part of the dimming interval according to the mapping table. The dimming interval at least includes the dimming interval with the minimum display brightness value and the maximum display brightness value.

[0026] In some optional embodiments, the brightness adjustment device further comprises:

[0027] The second mapping module is configured to detect whether the display brightness value is on a predetermined gamma curve. If the display brightness value is not on the predetermined gamma curve, the second mapping module performs second data mapping on the display brightness value to map the display brightness value to the predetermined gamma curve.

[0028] The present application also discloses a display device comprising the brightness adjustment device.

[0029] The present application also discloses a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the brightness adjustment method.

[0030] Compared with the related art, the present application improves the brightness adjustment effect by performing data mapping on the dimming interval with the minimum display brightness value and the maximum display brightness value.

[0031] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present specification. BRIEF DESCRIPTION OF DRAWINGS

[0032] The accompanying drawings incorporated in and forming a part of the specification, illustrate embodiments consistent with the present specification and serve to explain the principles of the present specification.

[0033] FIG. 1 is a schematic diagram of a 7T1C pixel driving circuit in the related art.

[0034] FIG. 2 is a timing diagram of the pixel circuit in FIG. 1.

[0035] FIG. 3 is a schematic diagram of a dimming method in the related art.

[0036] FIG. 4 is a white point color coordinate diagram of the dimming result corresponding to the dimming method in FIG. 3.

[0037] FIG. 5 is a flowchart of an embodiment of the brightness adjustment method of the present application.

[0038] FIG. 6 is a schematic diagram of a dimming method of the brightness adjustment method in FIG. 5.

[0039] FIG. 7 is a flowchart of another embodiment of the brightness adjustment method of the present application.

[0040] FIG. 8 is a schematic diagram of the S4 step in FIG. 7.

[0041] FIGS. 9 and 10 are white point color coordinate diagrams of the dimming results corresponding to the brightness adjustment method in FIG. 7.

[0042] FIG. 11 is a flowchart of another embodiment of the brightness adjustment method.

[0043] FIGS. 12 and 13 are white point color coordinate diagrams of the dimming results corresponding to the brightness adjustment method in FIG. 11. DETAILED DESCRIPTION

[0044] A display device such as a mobile phone, a computer, or a wearable device usually includes a brightness adjustment button, and a user changes an input display brightness level (also referred to as a display brightness value (DBV)) through the brightness adjustment button. Each display brightness level corresponds to a display brightness of a maximum grayscale in a display panel. When the display brightness of the maximum grayscale in the display panel changes, the display brightness of other grayscales also changes. Specifically, when the display brightness of the maximum grayscale in the display panel increases, the display brightness of other grayscales also increases; and when the display brightness of the maximum grayscale in the display panel decreases, the display brightness of other grayscales also decreases.

[0045] Gamma debugging makes the grayscale and brightness response curve of a screen display correspond to a set curve. The formula of the curve is: Y = a * (x / 255)^γ

[0046] where x is a grayscale value, a is the brightness corresponding to the maximum grayscale, Y is the brightness corresponding to the x grayscale, and γ is a constant. γ is usually set to 2.2±0.2, and this numerical range can be obtained according to debugging experience. When the set value of γ is 2.2, the human eye is most comfortable. Referring to FIG. 1, which is a schematic diagram of a 7T1C pixel driving circuit in the related art, in an actual debugging process, the actual correction of Gamma debugging is the Data voltage output by an IC, that is, the Data signal output by the Gamma debugging Vdata signal end in FIG. 1.

[0047] Please refer to Fig. 1 and Fig. 2, Fig. 2 is a timing diagram of the circuit shown in Fig. 1. In the reset stage, the Reset reset signal is low, the Gate gate control signal is high, and the EM signal is high. The first transistor T1 is on, and the remaining transistors are off. The Vinit reset signal resets N1. In the compensation stage, the Reset reset signal is high, the Gate gate control signal is low, and the EM signal is high. The second transistor T2, the driving transistor T3, the fourth transistor T4, and the seventh transistor T7 are on, and the first transistor T1, the fifth transistor T5, and the sixth transistor T6 are off. The Vinit reset signal resets the anode of the OLED light-emitting unit, and at the same time, the Vdata signal end outputs the Data signal to the first node N1, until the Vgs of the third transistor is equal to Vdata+Vth, and then the driving transistor T3 is turned off. In the light-emitting stage, the EM signal is low, the Gate gate control signal is high, and the Reset reset signal is high. At this time, the first transistor T1, the second transistor T2, the fourth transistor T4, and the seventh transistor T7 are off, and the driving transistor T3, the fifth transistor T5, and the sixth transistor T6 are on. The current flows from ELVDD to ELVSS, and the OLED light-emitting unit emits light. At this time, the current size I = 1 / 2*u*Cox*W / L*(Vgs-Vth)^2 = 1 / 2*K*(VDD-Vdata)^2

[0048] wherein W / L: width-to-length ratio of the channel of the driving transistor T3;

[0049] Cox: dielectric constant of the gate oxide layer;

[0050] μ: electron mobility.

[0051] The Data signal is stored in the capacitor Cst and controls the opening degree of the driving transistor T3, thereby controlling the communication between the VDD signal of the ELVDD signal end and the OLED light-emitting unit, and further controlling the light emission of the OLED light-emitting unit.

[0052] The current when the OLED light-emitting unit emits light is controlled by the Vdata, and the light-emitting time of the OLED light-emitting unit is controlled by the EM signal. The OLED starts to emit light when the EM is pulled low, and the time when the EM is pulled low determines the light-emitting time length. For example, under a screen refresh rate of 60Hz, the time of one frame is 16.6ms. If the current of a pixel is fixed, the time when the EM is pulled low in one frame is a ms and b ms respectively, a≠b, and the brightness between the two will appear obvious difference. That is, the brightness change can be controlled by controlling the duty cycle of the EM signal, i.e. the PWM duty cycle. The dimming mode of controlling the brightness change by controlling the duty cycle of the EM signal is PWM dimming.

[0053] As shown in FIG. 3, which is a diagram of a dimming method in the related art, a conventional display device, such as a wearable product, has several band points in a conventional mode. Taking the maximum brightness of the conventional mode as 800 nits and the DBV band points of the display device as three as an example, the three band points are a first band point DBV FF=255, a second band point DBV 7F=127, and a third band point DBV 2F=47, the first band point corresponds to a brightness of 800 nits, the second band point corresponds to a brightness of 172 nits, and the third band point corresponds to a brightness of 21 nits. An interval between the first band point and the second band point is a first dimming interval, an interval between the second band point and the third band point is a second dimming interval, and an interval between the third band point and DBV=0 is a third dimming interval. The first band point, the second band point, and the third band point are debugged. The first dimming interval is dimmed by Gamma debugging and then by interpolation, the second dimming interval is dimmed by Gamma debugging and PWM combination, and the third dimming interval is dimmed by data mapping. As shown in FIG. 4, this approach may cause the dimming curve after dimming by Gamma debugging and then by interpolation to not conform to a predetermined Gamma curve, and may also cause the white coordinates of the display panel to exceed the Spec when interpolating in the dimming interval of a high DBV. As shown in FIG. 4, which is a white point coordinate diagram of the dimming result corresponding to the dimming method in FIG. 3, the horizontal coordinate in FIG. 4 is a DBV value, the vertical coordinate is a coordinate of a color chart, and the two lines respectively represent the x coordinate and the y coordinate in the color chart.

[0054] To solve the above problems, the present application provides a brightness adjustment method, as shown in FIG. 5, which includes:

[0055] S1: setting N band points to divide the display brightness value of the display screen into several dimming intervals.

[0056] S2: debugging the band points and interpolating the brightness corresponding to the display brightness value of the dimming interval.

[0057] S3: searching for a mapping table and performing first data mapping on the display brightness value in part of the dimming intervals according to the mapping table, the part of the dimming intervals at least including the dimming interval with the minimum display brightness value and the dimming interval with the maximum display brightness value.

[0058] The various embodiments of the present application in accordance with the above inventive concept will be described in detail below.

[0059] As shown in FIG. 6, the N binding points can divide N dimming intervals or N+1 dimming intervals. The N binding points can be set at equal intervals or at predetermined DBV values according to requirements. In an optional embodiment, the maximum brightness of the conventional mode is 800 nits, and the DBV binding points of the display device are three. The three binding points are a first binding point, a second binding point, and a third binding point. The display brightness values corresponding to the first binding point, the second binding point, and the third binding point decrease in turn. The first binding point corresponds to the maximum display brightness value. For example, the three binding points are a first binding point DBV FF = 255, a second binding point DBV 7F = 127, and a third binding point DBV 2F = 47. The brightness corresponding to the first binding point is 800 nits, the brightness corresponding to the second binding point is 172 nits, and the brightness corresponding to the third binding point is 21 nits. The interval between the first binding point and the second binding point is a first dimming interval, the interval between the second binding point and the third binding point is a second dimming interval, and the interval between the third binding point and DBV = 0 is a third dimming interval. The first binding point, the second binding point, and the third binding point are debugged. The first dimming interval is dimmed by data mapping, the second dimming interval is dimmed by combining Gamma debugging and PWM, and the third dimming interval is dimmed by data mapping. The mapping ratio of the data mapping can be queried by a mapping table, and the establishment of the mapping table and the selection of the mapping threshold node are both based on the parameters of the display panel itself. For display panels with different parameters or the same parameters but different settings, the corresponding mapping table needs to be set according to the actual situation.

[0060] Optionally, the mapping table can be searched to determine a mapping ratio, so that the luminance of the first binding point after mapping is equal to the luminance corresponding to the second binding point. For example, in the present embodiment, the mapping table is Table 1, the mapping threshold node is the second binding point DBV = 127, and the mapping ratio obtained according to Table 1 is (127*16+1) / 4096 = 0.496. According to the Gamma conversion formula, when γ = 2.2, 0.496^2.2 = 0.214, that is, the data mapping ratio of the luminance is 0.214. The luminance corresponding to the first binding point DBV = 255 is 800 nits, and 800*0.214 ≈ 172 nits, which is exactly equal to the luminance corresponding to the second binding point. The luminance of the first binding point after mapping is equal to the luminance corresponding to the second binding point, which means that "equal" here is not in the strict sense, but allows a certain error as long as the error does not affect the display effect. The luminance of the first binding point after mapping is equal to the luminance corresponding to the second binding point, so that the display panel can output the data of the first binding point after mapping when it needs to output a picture with a luminance of 172 nits, without having to output the original data of the second binding point. Therefore, the present embodiment does not need to debug the second binding point, that is, the present embodiment can actually only set the first binding point and the third binding point without setting the second binding point, which greatly reduces the time cost in the actual production process and improves the production efficiency. Of course, for the case where the number of binding points is multiple, for example, N, the mapping ratio can also be determined by searching the mapping table, so that the luminance of the ath(a < N) binding point after mapping is equal to the luminance corresponding to the bth(b < a) binding point, so that the bth(b < a) binding point does not need to be debugged, thereby saving production time and improving production efficiency. When the display panel needs to output a picture with a luminance of 800 nits, it can output the data before mapping of the first binding point. The luminance corresponding to the third binding point is 21.6 nits, which can be inversely deduced according to the mapping ratio, 21.6 / 0.214 = 99.5 nit, so the target luminance of the third binding point DBV 2F = 47 needs to be debugged to 99.5 nits, so that the luminance corresponding to the third binding point DBV 2F = 47 after mapping according to the mapping table is 21.6 nits. In actual use, when the display panel needs to output a picture with a luminance of 21.6 nits, it can output the data after mapping of the third binding point.

[0061] Table 1

[0062] As shown in FIG. 7, in an optional embodiment, the luminance adjustment method further comprises:

[0063] S4: detecting whether the display luminance value is on the predetermined Gamma curve, and if the display luminance value is not on the predetermined Gamma curve, performing second data mapping on the display luminance value to map the display luminance value to the predetermined Gamma curve.

[0064] Still taking the maximum brightness of 800 nits in the normal mode as an example, three binding points are first binding point DBV FF=255, second binding point DBV 7F=127 and third binding point DBV 2F=47, the first binding point corresponds to the brightness of 800 nits, the second binding point corresponds to the brightness of 172 nits, and the third binding point corresponds to the brightness of 21 nits. The interval between the first binding point and the second binding point is the first dimming interval, the interval between the second binding point and the third binding point is the second dimming interval, and the interval between the third binding point and DBV=0 is the third dimming interval. Since the display device has fewer binding points, the curve obtained by data interpolation between the binding points may not conform to the standard Gamma curve. At this time, it can be detected whether the display brightness value corresponds to the brightness on the predetermined Gamma curve. If the display brightness value corresponds to the brightness not on the predetermined Gamma curve, the display brightness value and the corresponding brightness can be secondly data mapped so as to make the display brightness value and the corresponding brightness conform to the predetermined Gamma curve. In this way, the display brightness value and the corresponding brightness can better conform to the predetermined Gamma curve, thereby solving the color deviation caused by the drift of the Gamma interpolation of the white point coordinates due to the fewer binding points and the color deviation problem easily occurring in the high and low gray scales. As shown in FIG. 8, the first dimming interval and the second dimming interval are both secondly data mapped. As shown in FIG. 9 and FIG. 10, FIG. 9 and FIG. 10 are color deviation improvement effect diagrams after the second mapping. It can be obviously found that the x coordinate and the y coordinate of the white point coordinates tend to be stable at each display brightness value, without exceeding the preset maximum value and minimum value, and without the color deviation problem.

[0065] Optionally, when detecting whether the display brightness value is on the predetermined Gamma curve, the predetermined Gamma curves of different dimming intervals are different. Specifically, the γ values of the predetermined Gamma curves corresponding to different dimming intervals can be different. For example, the γ value of the first dimming interval can be 2.4, the γ value of the second dimming interval can be 2.2, and the γ value of the third dimming interval can be 2.0. In this way, the display panel can have better display effect in the whole range of display brightness values. Of course, the γ values of the first dimming interval, the second dimming interval and the third dimming interval can be set to other values according to the needs of the user to the display panel. When the dimming intervals of the display panel are multiple, for example, four or more dimming intervals. The predetermined Gamma curve of each dimming interval can be separately set, thereby obtaining a display panel meeting the needs.

[0066] As shown in FIG. 11, in an optional embodiment, the brightness adjusting method further comprises:

[0067] S3’: searching a mapping table and performing first data mapping on the display brightness values in all dimming intervals according to the mapping table.

[0068] Still taking the maximum brightness of 800 nits in the normal mode as an example, three binding points are first binding point DBV FF=255, second binding point DBV 7F=127 and third binding point DBV 2F=47, the first binding point corresponds to a brightness of 800 nits, the second binding point corresponds to a brightness of 172 nits, and the third binding point corresponds to a brightness of 21 nits. The interval between the first binding point and the second binding point is the first dimming interval, the interval between the second binding point and the third binding point is the second dimming interval, and the interval between the third binding point and DBV=0 is the third dimming interval. At this time, the first dimming interval, the second dimming interval and the third dimming interval all adopt the data mapping mode for dimming. The mapping ratio of data mapping can be queried through a mapping table, and the establishment of the mapping table and the selection of the mapping threshold node are both based on the parameters of the display panel itself. For display panels with different parameters or the same parameters but different settings, the corresponding mapping table needs to be set according to the actual situation. Among them, the mapping threshold nodes of the first dimming interval, the second dimming interval and the third dimming interval can be different, that is, the mapping ratios of the first dimming interval, the second dimming interval and the third dimming interval can be set to different ratios. In this way, the first dimming interval, the second dimming interval and the third dimming interval do not interfere with each other, and the first dimming interval, the second dimming interval and the third dimming interval can be independently controlled. In this way, the data mapping of each dimming interval can be targeted according to the different characteristics of the picture color in the display process under different brightness, so as to solve the color deviation and other problems that are prone to occur under different brightness. As shown in FIGS. 12 and 13, FIGS. 12 and 13 are color deviation improvement effect diagrams after the first data mapping of the display brightness value in all dimming intervals, it can be obviously found that the x coordinate and y coordinate of the white point coordinate tend to be stable at each display brightness value, without exceeding the maximum value and minimum value, and without color deviation and other problems.

[0069] In the embodiment, the PWM duty cycles of the first, second and third dimming intervals can also be independently set. The PWM duty cycles of at least two of the dimming intervals are different. Specifically, the PWM duty cycles of the first, second and third dimming intervals can all be different. The PWM duty cycles can be sequentially increased from the dimming interval with the lowest display brightness value to the dimming interval with the highest display brightness value. Specifically, as shown in Table 2, case 1 is the parameters of the normal dimming mode, and case 2 is the parameters of the dimming mode of the embodiment. Normal 1 corresponds to the first binding point, Normal 2 corresponds to the second binding point, and Normal 3 corresponds to the third binding point. In the normal dimming mode, the number of pulses of PWM is 4, and the normal dimming mode uses Gamma interpolation dimming between the second and third binding points and between 0 and the third binding point. Therefore, the PWM duty cycles between the second and third binding points and between 0 and the third binding point of the normal dimming mode cannot be independently adjusted. However, the PWM duty cycles of the first, second and third dimming intervals of the embodiment can all be different. Specifically, the number of pulses of PWM in the embodiment is 4, the PWM duty cycle of the first dimming interval can be 73.61%, the PWM duty cycle of the second dimming interval can be 61.6%, and the PWM duty cycle of the third dimming interval can be 54.4%. Of course, when the display panel has multiple dimming intervals, such as four or more dimming intervals. The PWM duty cycles of each dimming interval can be independently set without interfering with each other.

[0070] Table 2

[0071] The application also discloses a brightness adjusting device, which comprises a preset module, a Gamma module and a first mapping module. The preset module divides the display brightness values of a display screen into N dimming intervals by setting N binding points. The Gamma module performs interpolation on the brightness corresponding to the display brightness values of the dimming intervals according to the binding points. The first mapping module is pre-set with a mapping table, and the first mapping module performs first data mapping on the display brightness values in part of the dimming intervals according to the mapping table. The part of the dimming intervals at least includes the dimming interval with the minimum display brightness value and the dimming interval with the maximum display brightness value. Optionally, the first mapping module can perform first data mapping on the display brightness values in all the dimming intervals according to the mapping table.

[0072] In an optional embodiment, the brightness adjusting apparatus further comprises a second mapping module. The second mapping module is configured to detect whether the display brightness value is on a predetermined Gamma curve, and if the display brightness value is not on the predetermined Gamma curve, perform second data mapping on the display brightness value to map the display brightness value to the predetermined Gamma curve. Optionally, when detecting whether the display brightness value is on the predetermined Gamma curve, the predetermined Gamma curves of different dimming intervals are different. Specifically, the γ values of the predetermined Gamma curves corresponding to different dimming intervals can be different. For example, the γ value of the first dimming interval can be 2.4, the γ value of the second dimming interval can be 2.2, and the γ value of the third dimming interval can be 2.0.

[0073] The application further discloses a display device comprising the brightness adjusting apparatus, which can be a display screen, a mobile phone, a wearable device, or other devices with display functions.

[0074] The application further discloses a computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement the brightness adjusting method. The computer program can be stored in a non-volatile computer readable storage medium. When the computer program is executed, the computer program can include the flow of the above-mentioned embodiments. Any reference to memory, storage, database or other medium provided by the application and used in the embodiments can include non-volatile and / or volatile memory. The non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. The volatile memory can include random access memory (RAM) or external cache memory. As an illustration but not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

Claims

1. A luminance adjustment method characterized by, The method comprises: dividing display brightness values of a display screen into a plurality of dimming intervals by setting N binding points; debugging the binding points and interpolating brightness corresponding to display brightness values of the dimming intervals; finding a mapping table and performing first data mapping on the display brightness values in part of the dimming intervals according to the mapping table, the part of the dimming intervals at least including dimming intervals with minimum and maximum display brightness values.

2. The luminance adjusting method according to claim 1, wherein finding a mapping table and performing first data mapping on the display brightness values in all the dimming intervals according to the mapping table.

3. The luminance adjusting method according to claim 1, wherein The brightness adjustment method further comprises: detecting whether the display brightness values are on a predetermined gamma curve, and if not, performing second data mapping on the display brightness values to map the display brightness values onto the predetermined gamma curve.

4. The luminance adjusting method according to claim 3, wherein The predetermined gamma curves of different dimming intervals are different when detecting whether the display brightness values are on a predetermined gamma curve.

5. The luminance adjusting method according to claim 1, wherein The number of the binding points is three, i.e. a first binding point, a second binding point and a third binding point, the display brightness values corresponding to the first, second and third binding points decrease in turn, and the first binding point corresponds to the maximum display brightness value.

6. The luminance adjusting method according to claim 1, wherein The brightness adjustment method further comprises: finding the mapping table to determine a mapping ratio, so that the brightness after mapping of the a-th binding point is equal to the brightness corresponding to the b-th binding point, b 7. The luminance adjusting method according to claim 5, wherein The brightness adjustment method further comprises: performing pulse signal dimming and gamma combined dimming on the dimming intervals between the second binding point and the third binding point.

8. The luminance adjusting method according to claim 2, wherein The pulse signal duty cycles of at least two of all the dimming intervals are different.

9. The luminance adjustment method according to claim 8, wherein The pulse signal duty cycles increase in turn from the dimming intervals with low display brightness values to the dimming intervals with high display brightness values.

10. The luminance adjusting method according to claim 2, wherein The mapping ratios of different dimming intervals are different.

11. A luminance adjusting device, characterized by comprising: The brightness adjustment device comprises: a preset module for dividing display brightness values of a display screen into N dimming intervals by setting N binding points; a gamma module for interpolating brightness corresponding to display brightness values of the dimming intervals according to the binding points; a first mapping module for performing first data mapping on the display brightness values in part of the dimming intervals according to a mapping table, the part of the dimming intervals at least including dimming intervals with minimum and maximum display brightness values.

12. The luminance adjusting apparatus according to claim 11, wherein The brightness adjustment device further comprises: a second mapping module for detecting whether the display brightness values are on a predetermined gamma curve, and if not, performing second data mapping on the display brightness values to map the display brightness values onto the predetermined gamma curve.

13. A display device, characterized by comprising: The display device comprises the brightness adjustment device according to any one of claims 11-12.

14. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by a processor to implement the brightness adjustment method according to any one of claims 1-10.

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