Display method and related apparatus

Abstract

The present application provides a display method and its related device. The display method includes: determining the maximum light source brightness, the initial light source brightness within the current frame, and the maximum initial grayscale signal within the current frame; determining the target light source brightness within the current frame by multiplying the maximum light source brightness by the maximum initial grayscale signal; selecting a part of the global brightness change rule based on the initial light source brightness and the target light source brightness to generate the light source brightness change rule within the current frame, and determining the final grayscale signal of each pixel within the current frame based on the light source brightness change rule and the initial grayscale signal of each pixel within the current frame; or determining the final grayscale signal of each pixel within the current frame by looking up a grayscale mapping relationship table based on the initial light source brightness, the target light source brightness, and the initial grayscale signal of each pixel within the current frame; and displaying the current frame based on the final grayscale signal of each pixel within the current frame. The method of the present application compensates for possible abnormal display brightness caused by the change of current over time in a frame.

Description

Technical Field

[0001] This application relates to the field of display technologies, and particularly to a display method and related devices thereof. Background Art

[0002] In the prior art, when the maximum brightness of an image to be displayed in a frame is less than the maximum displayable brightness of a projection system, the brightness of the spatial light modulator can be reduced while increasing the grayscale brightness of the DMD display, so as to ensure that the corresponding display brightness of each pixel displayed on the display screen remains unchanged.

[0003] However, in actual use, unless specifically designed, the response speed of a generally used power supply generally cannot meet the requirements of rapid adjustment between frames. Especially when using a high-brightness light source with dozens or even hundreds of lasers, the total power output by the power supply is as high as thousands of watts. In the power supply design of a high-brightness light source in actual use, in some cases, the response speed of the power supply is greater than 50 ms, which is greater than the single-frame duration of 16.7 ms of a 60 Hz video signal, resulting in abnormal display brightness problems caused by the change of current over time in a frame. Summary of the Invention

[0004] This application provides a display method and related devices thereof, which can compensate for abnormal display brightness problems that may be caused by the change of current over time in a frame.

[0005] To achieve the above object, this application provides a display method, which includes:

[0006] Determine the maximum light source brightness, the initial light source brightness within the current frame, and the maximum initial grayscale signal within the current frame;

[0007] Determine the target light source brightness within the current frame by multiplying the maximum light source brightness by the maximum initial grayscale signal within the current frame;

[0008] Based on the initial light source brightness and the target light source brightness, select a part of the global brightness change rule to generate the light source brightness change rule within the current frame, and determine the final grayscale signal of each pixel point within the current frame based on the light source brightness change rule and the initial grayscale signal of each pixel point within the current frame; or,

[0009] Determine the final grayscale signal of each pixel point within the current frame by looking up a grayscale mapping relationship table based on the initial light source brightness, the target light source brightness, and the initial grayscale signal of each pixel point within the current frame, where the grayscale mapping relationship table is determined according to the global brightness change rule;

[0010] Based on the final grayscale signal of each pixel point within the current frame, display the current frame.

[0011] Among them, determining the final grayscale signal of each pixel in the current frame based on the light source brightness change rule and the initial grayscale signal of each pixel in the current frame includes:

[0012] When the initial light source brightness is different from the target light source brightness, combining multiple grayscale signals with the light source brightness change rule to obtain the actual display brightness corresponding to multiple grayscale signals; taking the product of the initial grayscale signal of each pixel in the current frame and the maximum light source brightness as the predicted display brightness of each pixel in the current frame, and taking the grayscale signal corresponding to the actual display brightness that matches the predicted display brightness of each pixel in the current frame as the final grayscale signal of each pixel in the current frame; or,

[0013] When the initial light source brightness is equal to the target light source brightness, taking the ratio of the maximum light source brightness to the initial light source brightness as the first ratio, and the product of the initial light source brightness of each pixel in the current frame and the first ratio is the final grayscale signal of each pixel in the current frame.

[0014] Among them, the light source brightness is divided into M levels, and displaying the current frame includes:

[0015] During the process of displaying the current frame, adjusting the brightness of one level of the light source, or not adjusting the light source brightness, so that the light source brightness is only adjusted between the M-level light source brightnesses, thereby reducing the uncertainty of the light source brightness change.

[0016] The drive current of the light source is divided into M levels, and adjusting the brightness of one level of the light source includes:

[0017] During the process of displaying the current frame, adjusting the drive current of one level to adjust the brightness of one level of the light source.

[0018] Among them, determining the target light source brightness in the current frame by multiplying the maximum light source brightness by the maximum initial grayscale signal in the current frame includes:

[0019] Calculating the product of the maximum initial grayscale signal in the current frame and the maximum light source brightness;

[0020] Determining the interval formed by the adjacent two levels of light source brightness where the product is located;

[0021] When the initial light source brightness is greater than the maximum value of the interval, reducing the level of the initial light source brightness by one level to obtain the level of the target light source brightness; or,

[0022] Increasing the level of the initial light source brightness by one level to obtain the level of the target light source brightness; or,

[0023] When the initial light source brightness is equal to the maximum value of the interval, the target light source brightness is equal to the initial light source brightness.

[0024] Among them, based on the initial light source brightness, the target light source brightness, and the initial gray signal of each pixel in the current frame, determining the final gray signal of each pixel in the current frame by looking up the gray mapping relationship table includes the following steps:

[0025] Determine various adjustment situations of the light source brightness;

[0026] Based on the initial light source brightness and the target light source brightness of each adjustment situation, determine the light source brightness change rule of each adjustment situation;

[0027] Based on the light source brightness change rule, determine the final gray signal corresponding to all feasible initial gray signals;

[0028] Save the correspondence between all feasible initial gray signals and the final gray signals in each adjustment situation to the gray mapping relationship table.

[0029] Among them, the display method further includes:

[0030] Based on the light source brightness change rule, determine the feasible maximum display brightness in each adjustment situation;

[0031] Calculate the ratio of the feasible maximum display brightness to the maximum light source brightness in each adjustment situation,

[0032] Save the ratio to the gray mapping relationship table.

[0033] Among them, in the adjustment situation where the target light source brightness is smaller than the initial light source brightness, the initial gray signal smaller than the second ratio is the feasible initial gray signal, where the second ratio is the ratio of the initial light source brightness to the maximum light source brightness.

[0034] To achieve the above object, the present application provides a display device, which includes a memory and a processor; a computer program is stored in the memory, and the processor is configured to execute the computer program to implement the steps of the above method.

[0035] Among them, the display device further includes: a light source and a digital micromirror coupled to the processor, and the light source is used to emit illumination light;

[0036] The digital micromirror is used to modulate the illumination light to obtain the modulated light required for the display image;

[0037] The processor is configured to determine the target light source brightness in the current frame, determine the final gray signal of each pixel in the current frame based on the initial light source brightness, the target light source brightness, and the initial gray signal of each pixel in the current frame, adjust the driving current of the light source based on the target light source brightness to adjust the brightness of the illumination light in the current frame; and the digital micromirror is used to modulate the adjusted illumination light based on the final gray signal of each pixel in the current frame to obtain the modulated light required for displaying each pixel in the current frame.

[0038] Considering that the brightness of the light source cannot be switched instantaneously, this application first determines the light source brightness change law within the current frame based on the initial light source brightness and the determined target light source brightness, and then determines the final gray signal of each pixel within the current frame based on the determined light source brightness change law, so that the requirement for the fast response speed of the light source in traditional Global Dimming can be reduced, and at the same time, the advantages of increased contrast and power saving brought by using Global Dimming light source adjustment can be partially realized, and the problem of abnormal display brightness that may be caused by the change of current over time within a frame can be compensated. Another solution that can achieve the above effects is to first determine the gray mapping relationship table according to the global brightness change law, and then only need to look up the gray mapping relationship table to determine the final gray signal of each pixel within the current frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0040] Figure 1 is a comparison schematic diagram of images with different bit depths in this application;

[0041] Figure 2 is a schematic diagram of the Global Dimming display method in this application;

[0042] Figure 3 is a schematic flowchart of an embodiment of the display method in this application;

[0043] Figure 4 is a schematic flowchart of an implementation manner for determining the light source brightness change law in the display method of this application;

[0044] Figure 5 is a schematic flowchart of another implementation manner for determining the light source brightness change law in the display method of this application;

[0045] Figure 6 is a schematic flowchart of yet another implementation manner for determining the light source brightness change law in the display method of this application;

[0046] Figure 7 is a schematic diagram for calculating the actual display brightness in the display method of this application;

[0047] Figure 8 is a schematic flowchart of another embodiment of the display method in this application;

[0048] Figure 9 It is a schematic diagram of the change in the brightness of the light source within one frame in the second embodiment of the display method of the present application;

[0049] Figure 10 It is a schematic diagram of the DMD flipping timing / display brightness when the DMD gray level is 1 / 2 in the second embodiment of the display method of the present application;

[0050] Figure 11 It is a schematic diagram of integrating the brightness change according to the DMD timing in the second embodiment of the display method of the present application;

[0051] Figure 12 It is a schematic diagram of the brightness mapping after sorting in the second embodiment of the display method of the present application;

[0052] Figure 13 It is a schematic diagram of the current / brightness change in the third embodiment of the display method of the present application;

[0053] Figure 14 It is a schematic diagram of integrating the brightness change according to the DMD timing in the third embodiment of the display method of the present application;

[0054] Figure 15 It is a schematic diagram of the brightness mapping after sorting in the third embodiment of the display method of the present application;

[0055] Figure 16 It is a schematic diagram of the structure of an embodiment of the display device of the present application;

[0056] Figure 17 It is a schematic diagram of the structure of another embodiment of the display device of the present application. Detailed implementation manners

[0057] To enable those skilled in the art to better understand the technical solutions of the present application, the display method and its related devices provided by the present application will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0058] In this article, a "frame" refers to a single image frame, which is the smallest unit in an image animation and is equivalent to each frame of film in a movie. A frame is a still image, and consecutive frames form an animation, such as a TV image. Generally speaking, the number of frames simply refers to the number of pictures transmitted in one second, or it can also be understood as the number of times the graphics processor can refresh per second, usually expressed in fps (Frames Per Second). Each frame is a still image, and quickly displaying frames continuously creates the illusion of motion. A higher frame rate can result in a smoother and more realistic animation. The more frames per second (fps), the smoother the displayed action will be. Among them, an image frame consists of several pixel points. The pixel value displayed by each pixel point in an image frame is related to the gray scale signal of that pixel point and the brightness of the light source, and the brightness of the light source is directly affected by the current driven by the light source power supply.

[0059] In this article, "bit depth" refers to the number of bits required to represent the gray scale signal of a certain pixel point in a gray scale image. The larger the bit depth, that is, the more bits required, the smaller the difference between adjacent gray scale signals, the less obvious the digital sampling of analog information, and the smoother the transition of gray scale signals in the image. As Figure 1 shown, in a gray scale image with a bit depth of 1, a pixel point has only 2 (2 1 ) states, namely bright and dark; while in an image with a bit depth of 8, a pixel point can have 256 (2 8 ) gray scale states, that is where I m is the maximum brightness that a pixel point in the gray scale image can display.

[0060] In this article, the "least significant bit LSB (least significant bit)" corresponds to the gray scale difference between two adjacent gray scale signals during the display process. For a gray scale signal with a bit depth of n, the display brightness corresponding to the LSB is I m / 2 n .

[0061] In this article, the "initial light source brightness" refers to the brightness of the light source irradiation at the starting time point of the display of the current frame.

[0062] In this article, the "target light source brightness" refers to the brightness value that the brightness of the light source irradiation needs to reach during the display period of the current frame.

[0063] This application discloses a display device that displays the current frame by controlling the light source brightness and the gray scale signal of each pixel point in the current frame. The display device can be a DLP (Digital Light Processing) projection display system, but is not limited thereto.

[0064] Optionally, the display device includes a light source. By adjusting the current of the light source, dynamic adjustment of the illumination brightness of the light source can be achieved, and thus a transformation of the light source brightness from the initial light source brightness to the target light source brightness can be realized within the display time of the current frame.

[0065] In addition, the display device may further include an optical switch. The optical switch may be a DMD (Digital Micromirror Device), but is not limited thereto. The operation of the optical switch corresponding to each pixel can be controlled according to the gray-scale signal of the pixel to control the gray-scale value of the pixel.

[0066] Specifically, when the optical switch is a DMD, the gray-scale value of the corresponding pixel can be controlled by controlling the time ratio of the optical switch in the "on" state within the display period of a frame of image, that is, the gray-scale value of the corresponding pixel is controlled by controlling the flipping timing of the DMD.

[0067] Among them, the display method may be a Global Dimming display method. Specifically, as Figure 2 shown, when the initial gray-scale signals in a frame of image are all less than the maximum gray-scale signal 1, the signal amplitude of the signal transmitted to the optical switch can be globally transformed by the image analysis and processing unit so that the maximum value of the final gray-scale signal approaches the maximum gray-scale signal 1. Assume that the initial gray-scale signal of the original pixel is G, and the final gray-scale signal of the pixel becomes G' after stretching; correspondingly, the brightness of the light source irradiation will change from L to L', and L*G = L′*G′ is satisfied. Specifically, the selection principle of L' is L*G max = L′*G′ max ≤ L′, and the selected gray-scale amplification factor is For each pixel with an initial gray-scale signal of G, the final gray-scale signal G′ transmitted from the image processing unit to the optical switch is G′ = βG. However, in the Global Dimming display method, there is a very important assumption that the light source brightness is constant within the display period of each frame, and the light source brightness can instantaneously change between adjacent two frames. This requires that the power supply drive of the light source has a very fast response speed, that is, the response time of the power supply drive of the light source is much less than the display time of a frame of image. However, in the actual use process, the response time of the power supply of the light source may be slightly less than the display time of a frame of image, or even may be greater than the display time of a frame of image, that is, the response time of the power supply of the light source cannot meet the requirement of being much less than the display time of a frame of image.

[0068] To solve the above problem of insufficient power supply response speed, the present application proposes a solution to determine the final gray-scale signal sent to the optical switch according to the change rule of the light source brightness, so as to solve the problem of abnormal display gray scale that may be caused by the change of current over time in one frame. Specifically, the solution to determine the final gray-scale signal sent to the optical switch according to the change rule of the light source brightness can refer to the implementation manner of the following display method.

[0069] For details, please refer to Figure 3 , Figure 3 which is a schematic flow chart of an implementation manner of the display method of the present application. The display method of this implementation manner includes the following steps.

[0070] S110: Determine the maximum light source brightness, the initial light source brightness within the current frame, and the maximum initial gray-scale signal within the current frame.

[0071] Among them, the initial light source brightness within the current frame refers to the irradiation brightness of the light source at the start time of the current frame display, which is also equivalent to the irradiation brightness of the light source at the end time of the previous frame image display.

[0072] The maximum light source brightness refers to the maximum value that the irradiation brightness of the light source can reach.

[0073] The maximum initial gray-scale signal within the current frame refers to the maximum value among the initial gray-scale signals of all pixel points within the current frame.

[0074] S120: Determine the target light source brightness within the current frame by multiplying the maximum light source brightness and the maximum initial gray-scale signal within the current frame.

[0075] In one implementation manner, the product of the maximum light source brightness and the maximum initial gray-scale signal within the current frame can be directly used as the target light source brightness within the current frame.

[0076] In another implementation manner, the light source brightness is divided into M levels, and the light source brightness is adjusted step by step, where M is a positive integer. The light source brightness can be divided with unequal step sizes or with equal step sizes. It can be understood that in order to ensure that the light source brightness of the whole number of levels is adjusted in each frame, the change time between two adjacent levels of light source brightness can be less than the duration of each frame. In addition, since the duration of each frame is inversely proportional to the frame rate, the number of levels of light source brightness division can also be dynamically adjusted according to the frame rate.

[0077] Optionally, the step of adjusting the integer-level light source brightness per frame and determining the target light source brightness within the current frame based on the product of the maximum light source brightness and the maximum initial grayscale signal within the current frame may include: first determining the interval formed by two adjacent levels of light source brightness in which the product of the maximum light source brightness and the maximum initial grayscale signal within the current frame lies; and taking the maximum or minimum value of this interval as the target light source brightness. Further, in the case where the light source brightness can change by multiple levels within one frame display time, it may occur that the time taken to change from the initial light source brightness to the maximum or minimum value of the interval is longer than the per-frame time. Based on this, the step of determining the target light source brightness within the current frame based on the product of the maximum light source brightness and the maximum initial grayscale signal within the current frame may include: first determining the interval formed by two adjacent levels of light source brightness in which the product of the maximum light source brightness and the maximum initial grayscale signal within the current frame lies; starting from the initial light source brightness, along the direction from the initial light source brightness to the maximum or minimum value of the interval, determining the maximum level of light source brightness that the light source brightness can reach within the per-frame time, and taking the maximum level of light source brightness that can be reached as the target light source brightness.

[0078] Preferably, the step of adjusting the light source brightness by at most one level per frame and determining the target light source brightness within the current frame based on the product of the maximum light source brightness and the maximum initial grayscale signal within the current frame may include: first determining the interval formed by two adjacent levels of light source brightness in which the product of the maximum light source brightness and the maximum initial grayscale signal within the current frame lies; when the initial light source brightness is greater than the maximum / minimum value of the interval, decreasing the level of the initial light source brightness by one level to obtain the level of the target light source brightness; or, when the initial light source brightness is less than the maximum / minimum value of the interval, increasing the level of the initial light source brightness by one level to obtain the level of the target light source brightness; or, when the initial light source brightness is equal to the maximum / minimum value of the interval, the target light source brightness is equal to the initial light source brightness. More preferably, the initial light source brightness is compared with the maximum value of the interval to determine the level of the target light source brightness, because this can be more in line with the actual situation, and there is no difference or only a small difference between the actual display brightness and the expected display brightness of each pixel point.

[0079] S130: Based on the initial light source brightness and the target light source brightness, select a part of the global brightness change rule to generate the light source brightness change rule within the current frame.

[0080] It can be understood that the global brightness change rule includes the rule of the light source brightness changing from the maximum light source brightness to the minimum light source brightness, and also includes the rule of the light source brightness changing from the minimum light source brightness to the maximum light source brightness. It can be understood that the minimum light source brightness is the minimum value that the illumination light brightness can achieve.

[0081] The rule of changing from the initial light source brightness to the target light source brightness can be selected from the global brightness change rule, and the light source brightness change rule can be generated according to the rule of changing from the initial light source brightness to the target light source brightness. It can be understood that when the initial light source brightness is equal to the target light source brightness, the rule of changing from the initial light source brightness to the target light source brightness is the initial light source brightness point.

[0082] Among them, when the time from the initial light source brightness to the target light source brightness in the global brightness change rule is less than the duration of each frame, the rule of changing from the initial light source brightness to the target light source brightness can be directly used as a part of the light source brightness change rule within the current frame, and the light source brightness of the remaining part of the light source brightness change rule within the current frame is equal to the target light source brightness and / or the initial light source brightness. For example, as Figure 4 shown, from Figure 4 (A)'s global brightness change rule, select the part where the initial light source brightness L m0 changes to the target light source brightness L t , and use the rule of changing the initial light source brightness L m0 to the target light source brightness L t as the middle part of the light source brightness change rule shown in Figure 4 (B). The light source brightness of the first part of the light source brightness change rule shown in Figure 4 (B) is equal to the initial light source brightness L m0 , Figure 4 the light source brightness of the latter part of the light source brightness change rule shown in (B) is equal to the target light source brightness L t . Another example, as Figure 5 shown, from Figure 5 (A)'s global brightness change rule, select the part where the initial light source brightness L m0 changes to the target light source brightness L t , and use the rule of changing the initial light source brightness L m0 to the target light source brightness L t as the first part of the light source brightness change rule shown in Figure 5 (B). The light source brightness of the latter part of the light source brightness change rule shown in Figure 5 (B) is equal to the target light source brightness. Of course, it is not limited to this.

[0083] When the time from the initial light source brightness to the target light source brightness in the global brightness change rule is equal to the duration of each frame, the rule of changing from the initial light source brightness to the target light source brightness can be directly selected as the light source brightness change rule within the current frame.

[0084] When the time from the initial light source brightness to the target light source brightness in the global brightness change rule is greater than the duration of each frame, the rule that the initial light source brightness changes by the duration of each frame along the direction of change to the target light source brightness is used as the light source brightness change rule within the current frame. For example, as Figure 6 shown, the duration for the initial light source brightness L m0 to change to the target light source brightness L t is 20 ms, which is longer than the duration of each frame of 16.7 ms. Therefore, the rule that the initial light source brightness in the global brightness change rule shown in Figure 6 (A) changes by the duration of each frame along the direction of change to the target light source brightness is used as the light source brightness change rule shown in Figure 6 (B).

[0085] S140: Determine the final gray signal of each pixel in the current frame based on the light source brightness change rule and the initial gray signal of each pixel in the current frame.

[0086] After determining the light source brightness change rule, the final gray signal of each pixel in the current frame can be determined based on the light source brightness change rule and the initial gray signal of each pixel in the current frame.

[0087] Determining the final gray signal of each pixel in the current frame based on the light source brightness change rule and the initial gray signal of each pixel in the current frame may include: various gray signals and the light source brightness change rule can be combined to obtain the actual display brightness corresponding to various gray signals; then, calculate the product of the initial gray signal of each pixel and the maximum light source brightness, and use this product as the expected display brightness of each pixel in the current frame; use the gray signal corresponding to the actual display brightness that matches the expected display brightness of each pixel in the current frame as the final gray signal of each pixel in the current frame.

[0088] Among them, all gray signals can be combined with the light source brightness change rule to obtain the actual display brightness corresponding to all gray signals. Since the actual display brightness corresponding to the gray signal of 0 is necessarily 0, therefore, the above "all gray signals" can be all gray signals except 0. In one implementation scenario, if the bit depth of the current frame display is n, all gray signals except 0 include etc., a total of 2 n -1 kinds of gray signals.

[0089] In addition, in order to ensure that the physical display brightness of each frame conforms to the expected display brightness, each gray signal may only correspond to one DMD flip timing sequence. For example, the gray signal (100) corresponds to the flip timing sequence (1000000), and the gray signal (010) corresponds to the flip timing sequence (0110000).

[0090] It is understandable that a grayscale signal can also correspond to multiple flipping timings of the DMD. However, when determining the actual display brightness corresponding to the grayscale signal by combining the grayscale signal with the variation law of the light source brightness, the flipping timings of each DMD corresponding to each grayscale signal should be combined with the variation law of the light source brightness to determine the actual display brightness of the flipping timings of each DMD corresponding to each grayscale signal. In this way, when matching the predicted display brightness of each pixel with the actual display brightness of the flipping timings of each DMD corresponding to each grayscale signal, the final grayscale signal and the final flipping timing of each pixel can be determined, and more precise control can be achieved.

[0091] Optionally, time-scale integration can be performed on the variation law of the light source brightness according to the time information of multiple grayscale signals to obtain the actual display brightness corresponding to multiple grayscale signals. Exemplarily, as Figure 7 shown, the display bit depth is n, and when the variation law of the light source brightness is , the grayscale signal is s(t i ), then the actual display brightness corresponding to the grayscale signal is where s(t i ) is the flipping state of the DMD from time t i to time t i+1 : when in the On state, when in the Off state, s(t i ) = 0. It should be noted that for the convenience of expression, it is assumed that the duration of the DMD displaying the LSB is a constant value i.e., the duration from time t i to time t i+1 is where T refers to the duration of each frame. It can be understood that in the actual process, in order to increase the bit depth, the duration from t i to time t i+1 can also be set to unequal lengths. During specific operations, only the corresponding durations need to be replaced as required.

[0092] In an application scenario, taking the grayscale signal corresponding to the actual display brightness that matches the predicted display brightness of each pixel in the current frame as the final grayscale signal of each pixel in the current frame means that the predicted display brightness is equal to the actual display brightness. For example, assume that the actual display brightness corresponding to the grayscale signal (010) is 0.7 cd / m 2 , and the predicted display brightness corresponding to the initial grayscale signal (100) of a pixel in the current frame is also 0.7 cd / m 2, the predicted display brightness of the initial grayscale signal (100) matches the actual display brightness corresponding to the grayscale signal (010), so that the final grayscale signal corresponding to the initial grayscale signal (100) is (010). Preferably, this application scenario can be applied to the situation where the light source brightness needs to be reduced, so as to ensure that the predicted display brightness of each pixel point in the current frame is equal to the actual display brightness.

[0093] In another application scenario, the matching of the predicted display brightness and the actual display brightness means that the ratio of the actual display brightness to the predicted display brightness is a first value. For example, let the actual display brightness corresponding to the grayscale signal (101) be 1.3 cd / m 2 , the first value is 0.7, and the predicted display brightness corresponding to the initial grayscale signal (110) of a pixel point in the current frame is 0.91 cd / m 2 , where 0.91 = 1.3 * 0.7, that is, the predicted display brightness of the initial grayscale signal (110) matches the actual display brightness corresponding to the grayscale signal (101), so that the final grayscale signal corresponding to the initial grayscale signal (110) is (101). The first value can be adjusted according to the situation of the initial grayscale signal of each frame. For example, the first value can be equal to the ratio of the actual display brightness corresponding to the grayscale signal 1 to the predicted display brightness of the initial grayscale signal 1. Or the first value can be preset. Preferably, this application scenario can be applied to the situation where the light source brightness needs to be increased. Because the current cannot be increased instantaneously, the highest achievable brightness in the current frame according to the light source brightness change rule may be less than the predicted display brightness of some grayscale signals. At this time, it can be considered to proportionally decrease the predicted display brightness of all pixel points in the current frame.

[0094] In yet another application scenario, the difference between the predicted display brightness and the actual display brightness is a second value, that is, the predicted display brightness matches the actual display brightness. The second value can be adjusted according to the situation of the initial grayscale signal of each frame. For example, the second value can be equal to the difference between the predicted display brightness of the initial grayscale signal 1 and the actual display brightness corresponding to the grayscale signal 1. Or the second value can be preset. Preferably, this application scenario can be applied to the situation where the light source brightness needs to be increased. Because the current cannot be increased instantaneously, the highest achievable brightness may be less than the predicted display brightness of some grayscale signals. At this time, the predicted display brightness of all pixel points in the current frame can be reduced by a fixed value simultaneously.

[0095] Of course, the method of matching the predicted display brightness and the actual display brightness is not limited to the above three implementation methods.

[0096] Further, after obtaining the actual display brightness corresponding to multiple grayscale signals, they can be arranged in ascending order of the actual display brightness, and the sorted actual display brightness can be corresponding to the grayscale signals from small to large, so as to obtain the correspondence between the actual display brightness and the grayscale signals. Then, according to the expected display brightness of each pixel in the current frame, the final display brightness of each pixel in the current frame can be found from the correspondence between the actual display brightness and the grayscale signals, which is convenient for determining the correspondence between the initial grayscale signal and the final grayscale signal of each pixel.

[0097] In addition, when the initial light source brightness is equal to the target light source brightness, since all the light source brightnesses in the light source brightness change rule are equal to the initial light source brightness, that is, the light source brightness in the current frame is constant, the steps of determining the final grayscale signal of each pixel in the current frame based on the light source brightness change rule and the initial grayscale signal of each pixel in the current frame include: taking the ratio of the maximum light source brightness to the initial light source brightness as the first ratio, and the product of the initial light source brightness of each pixel in the current frame and the first ratio is the final grayscale signal of each pixel in the current frame.

[0098] S150: Display the current frame based on the final grayscale signal of each pixel in the current frame.

[0099] The steps of displaying the current frame include flipping the lens for displaying gray levels according to the final grayscale signal of each pixel in the current frame.

[0100] The steps of displaying the current frame further include controlling the illumination light brightness to change from the initial light source brightness to the target light source brightness. It can be understood that in the scheme where the light source brightness is divided into M levels, the difference between the level of the target light source brightness and the level of the initial light source brightness is an integer. Preferably, the difference between the level of the target light source brightness and the level of the initial light source brightness is 1 or 0.

[0101] In this embodiment, the present application takes into account that the light source brightness cannot be switched instantaneously. First, based on the initial light source brightness and the determined target light source brightness, the light source brightness change rule in the current frame is determined. Then, based on the determined light source brightness change rule, the final grayscale signal of each pixel in the current frame is determined, so that the lighting system can reduce the requirement for the fast response speed of the light source in traditional Global Dimming, and at the same time can have the advantages of improved contrast and power saving brought by using Global Dimming to adjust the light source. Most importantly, it can compensate for the difference in display brightness that may be caused by the change of current over time in a frame, thereby solving the problem of abnormal display brightness.

[0102] Another implementation that can achieve the above effects is to first determine the gray-scale mapping relationship table according to the global brightness change rule, and then only need to look up the gray-scale mapping relationship table to determine the final gray-scale signal of each pixel point in the current frame. As Figure 8 shown, the display method of this implementation specifically includes the following steps.

[0103] S210: Determine the maximum light source brightness, the initial light source brightness in the current frame, and the maximum initial gray-scale signal in the current frame.

[0104] S220: Determine the target light source brightness in the current frame by multiplying the maximum light source brightness by the maximum initial gray-scale signal in the current frame.

[0105] S230: Based on the initial light source brightness, the target light source brightness, and the initial gray-scale signal of each pixel point in the current frame, determine the final gray-scale signal of each pixel point in the current frame by looking up the gray-scale mapping relationship table.

[0106] Among them, it can be understood that the gray-scale mapping relationship table stores the corresponding relationship between the initial gray-scale signal and the final gray-scale signal when the initial light source brightness changes to the target light source brightness. Thus, based on the initial light source brightness, the target light source brightness, and the initial gray-scale signal of each pixel point in the current frame, the final gray-scale signal of each pixel point in the current frame can be determined by looking up the gray-scale mapping relationship table. In this way, when displaying each frame of the image, directly looking up the gray-scale mapping relationship table can save calculation time and display each frame of the image faster.

[0107] It can be understood that before step S230, it includes: determining the gray-scale mapping relationship table according to the global brightness change rule.

[0108] Among them, determining the gray-scale mapping relationship table according to the global brightness change rule includes: determining various adjustment situations of the light source brightness; selecting a part from the global brightness change rule based on the initial light source brightness and the target light source brightness of each adjustment situation to generate the light source brightness change rule of each adjustment situation; determining the final gray-scale signal corresponding to all feasible initial gray-scale signals based on the light source brightness change rule; and saving the corresponding relationship between all feasible initial gray-scale signals and the final gray-scale signal in each adjustment situation to the gray-scale mapping relationship table.

[0109] It can be understood that determining various adjustment situations of the light source brightness means determining various change situations of the light source brightness. For example, various adjustment situations of the light source brightness include the light source brightness changing from l0 to l1, the light source brightness changing from l1 to l2, the light source brightness changing from l2 to l3,..., the light source brightness changing from l n changing to l n+1There are various situations. Of course, in order to determine the final gray-scale signals of all pixel points of each frame by looking up the gray-scale mapping relation table before displaying each frame, all adjustment situations of the light source brightness should be determined.

[0110] Furthermore, to facilitate listing all adjustment situations of the light source brightness, the light source brightness can be divided into M levels. If multiple levels of light source brightness can be adjusted within one frame, then there can be M 2 -M kinds of change situations. By dividing the light source brightness into levels in this way, it is limited that the light source brightness can only be adjusted between a limited number of light source brightness levels, making the types of light source brightness adjustment of the light source limited. This can reduce the uncertainty of the light source brightness change, and then the corresponding relationship of the gray-scale signals under all light source brightness adjustment situations can be summarized, so that the final gray-scale information can be determined based on the previously determined corresponding relationship of the gray-scale signals during the display process. In addition, it is also necessary to consider that some light source brightness change situations take more time than the duration of each frame, that is, some light source brightness changes cannot be achieved within each frame. Therefore, all adjustment situations of the light source brightness are less than or equal to M 2 -M kinds of change situations. More preferably, at most one level of light source brightness is adjusted within one frame, so that there can be 2M - 2 kinds of change situations for the light source brightness.

[0111] It can be understood that for the specific content of the step of selecting a part from the global brightness change rule based on the initial light source brightness and the target light source brightness of each adjustment situation to generate the light source brightness change rule of each adjustment situation, reference can be made to step S130, which will not be elaborated here. For the specific content of the step of determining the final gray-scale signals corresponding to all feasible initial gray-scale signals based on the light source brightness change rule, reference can be made to step S140, which will not be elaborated here.

[0112] After determining the final gray-scale signals corresponding to all feasible initial gray-scale signals in each adjustment situation, the corresponding relationship between all feasible initial gray-scale signals and the final gray-scale signals in each adjustment situation can be saved in the gray-scale mapping relation table. Among them, all feasible initial gray-scale signals can refer to all initial gray-scale signals. That is, when the bit depth is n, all feasible initial gray-scale signals include etc. 2 n- A grayscale signal. In another implementation, all feasible initial grayscale signals can refer to all initial grayscale signals that can be achieved. Since the light source brightness of some frames needs to be reduced to the target light source brightness, and when the target light source brightness of these frames is less than the maximum light source brightness, it indicates that the maximum initial grayscale signal of these frames is less than the ratio of the target light source brightness to the maximum light source brightness. Thus, the initial grayscale signal smaller than the ratio of the target light source brightness to the maximum light source brightness is an achievable initial grayscale signal, that is, a feasible initial grayscale signal. This reduces the number of initial grayscale signals that need to be calculated, and further reduces the number of corresponding relationships between the initial grayscale signals and the final grayscale signals that need to be stored in the grayscale mapping relationship table. In yet another implementation, the initial grayscale signal smaller than the ratio of the initial light source brightness to the maximum light source brightness can also be used as a feasible initial grayscale signal, where the ratio of the initial light source brightness to the maximum light source brightness can be used as the second ratio.

[0113] Furthermore, the ratio of the initial grayscale signal to the final grayscale signal can be used as the amplification factor corresponding to the initial grayscale signal, and the amplification factor corresponding to the initial grayscale signal is also saved in the grayscale mapping relationship table.

[0114] Optionally, the feasible maximum display brightness in each adjustment case can also be calculated where the feasible maximum display brightness in each adjustment case refers to: within one frame, when the DMD is fully in the On state, the highest brightness that can be achieved. That is, The ratio of the actual display brightness corresponding to the initial grayscale signal to the feasible maximum display brightness can be saved in the grayscale mapping relationship table. In addition, the ratio of the feasible maximum display brightness in each adjustment case to the maximum light source brightness can also be saved in the grayscale mapping relationship table. So as to calculate the actual display brightness corresponding to the initial grayscale signal through the ratio of the feasible maximum display brightness to the maximum light source brightness and the ratio of the actual display brightness corresponding to the initial grayscale signal to the feasible maximum display brightness. In this way, the actual display brightness of each initial grayscale signal can be determined by looking up the grayscale mapping relationship table. Of course, the actual display brightness corresponding to the initial grayscale signal in each adjustment case can also be directly stored in the grayscale mapping relationship table, so that the actual display brightness of each initial grayscale signal in each adjustment case can be obtained directly by looking up.

[0115] S240: Display the current frame based on the final grayscale signal of each pixel point in the current frame.

[0116] The following is to better illustrate the display method of the present application, and it is exemplarily illustrated based on the following specific embodiments of the display method. Among them, Embodiment 1 is used to exemplarily illustrate the relevant content of the grayscale mapping relationship table in the second embodiment of the display method.

[0117] Example 1

[0118] The range of changing the driving current of the light source from the adjustable minimum value to the adjustable maximum value is divided into M levels, and the corresponding current values are I1, I2, ……, I M , so that the light source brightness of the corresponding spatial light modulator is also M levels, that is, the corresponding light source brightnesses are L1, L2, ……, L M . The adjustment step ΔI between adjacent current levels m = I m - I m-1 , (m = 2, 3, … M). During the display time of one frame, the current I m-1 increases to I m , or the current I m+1 decreases to I m , that is, the current can change to the stable value I m according to a determined waveform.

[0119] If the maximum gray signal value G of all pixel points in one frame max satisfies L m-1 < L M · G max ≤ L m , where L M is the maximum light source brightness that the display device can achieve, then the target light source brightness in this frame is set to L m . Assume that the stable light source brightness actually achieved in the previous frame is L m0 , that is, the initial light source brightness of one frame is L m0 , and the following three cases need to be specifically considered.

[0120] (1) When m0 = m, then the current I m0 = I m , the initial light source brightness and the target light source brightness are both L m , and it can be understood that L m = L t . At this time, during the display time of one frame, the current does not need to be adjusted, and the light source brightness is a constant value. And the gray scale amplification factor adopts the same gray scale amplification factor for different gray signals G, that is

[0121] (2) When m0 > m, then the current I m0 > I m , the initial light source brightness L m0 in one frame is greater than the target light source brightness L m , where, L m = L tAt this time, within one frame display time, the drive current of the light source needs to be reduced to I m , and the corresponding change in the brightness of the light source is Therefore, the actual display brightness of each pixel point in one frame is denoted as Meanwhile, define

[0122] It is worth mentioning that according to the technical solution of this application, on the one hand, in a determined design solution, since the flipping timing of the DMD is determined, therefore, there must be a certain which can be defined as the gray scale amplification factor; on the other hand, since the brightness of the light source also changes when the current changes, different initial gray scale signals G need to correspond to different gray scale amplification factors, making different initial gray scale signals more matched with different gray scale amplification factors, so that the final gray scale signal determined by the initial gray scale signal and the gray scale amplification factor can be more accurate, thereby enabling the expected display brightness of different initial gray scale signals to match the actual display brightness of the final gray scale signal, so as to solve the problem of abnormal display gray levels that may be caused by the change in the brightness of the light source due to the current change within one frame. Therefore, this application preferably writes in vector form.

[0123] The calculation process of is as follows: First, within one frame display time, all the mirrors of the DMD are in the On state, and the highest brightness that can be achieved at the back end of the DMD is Then, the actual display brightness generated by combining 2 n -1 different gray scale signals G with the light source brightness change rule is sorted in ascending order to obtain a new 2 n -1 gray scale signals and defined as G'. According to the mapping principle, each G corresponds to a G', so that the gray scale amplification factor can be defined is actually a kind of gray scale mapping relationship. By aggregating multiple gray scale mapping relationships, a gray scale mapping relationship table can be formed. Specifically, the gray scale mapping relationship table contains the following three types of information: (1) The correspondence between the sequence value Ind G of the initial gray scale signal and the sequence value Ind G’ of the final gray scale signal, with a total of (M + 1)2 n correspondences; (2) The ratio value of the actual display brightness to the feasible maximum display brightness , with a total of (M + 1)2 n values; (3) The ratio value of the feasible maximum display brightness to the maximum light source brightness L M , with a total of (M + 1) values.

[0124] It can be understood that the gray-scale mapping relationship in the case of m0 = m also needs to be stored. However, compared with the gray-scale mapping relationship in the case of m0 > m, the gray-scale mapping relationship in the case of m0 = m is rather special. Because when m0 = m, the ratio of different initial gray-scale signals G to their corresponding final gray-scale signals G' is equal, all being That is That is, for different initial gray-scale signals G, the same brightness amplification factor is adopted. In addition, when m0 = m, the actual display brightness compared with the feasible maximum display brightness The proportional value is the gray scale G'; the feasible maximum display brightness L m0 and L M The proportional value is

[0125] (3) When m0 < m, then the current I m0 < I m , the initial light source brightness L within one frame m0 is less than the target light source brightness L m , where L m = L t . At this time, within one frame display time, the driving current of the light source needs to be increased to I m , and the corresponding change in the light source brightness is Therefore, the actual display brightness of each pixel point in one frame can be recorded as Correspondingly, define

[0126] However, for the case of m0 < m, there may be a problem that the current cannot be increased rapidly, resulting in the feasible maximum display brightness of one frame being smaller than the target light source brightness of that frame, that is, when m0 + 1 < m, At this time, a scheme of temporarily reducing the display brightness needs to be considered. In addition, similar to the situation in (2), the gray-scale amplification factor in the case of m0 < m can be defined as

[0127] According to the above analysis, the core problem to be solved lies in how to obtain the gray-scale amplification factor so that the gray-scale amplification factor can satisfy where k is the difference between the level of the driving current corresponding to the initial light source brightness and the level of the driving current corresponding to the target light source brightness, In addition, the maximum number of gray-scale mapping relationships to be stored is 3×M(2 n + 2 n + 1). And when k = 0, all initial gray-scale signals G correspond to the same gray-scale amplification factor It can be considered to reduce the number of stored gray-scale mapping relationships, and the number can be reduced to 2×M(2 n + 2n (+1)+M. Additionally, for the case of k = -1, it indicates that the current needs to be reduced. At this time, the maximum grayscale signal within one frame display time is That is, there is actually no need to confirm the grayscale mapping relationship of the initial grayscale signal greater than At this time, the number of grayscale mapping relationships that need to be stored can be reduced.

[0128] The solution of this embodiment summarizes the grayscale mapping relationships in all feasible adjustment cases through a grayscale mapping relationship table. Thus, during the actual display process, the final grayscale signal of each pixel point in each frame can be directly determined based on the stored grayscale mapping relationship, so that the actual display brightness corresponding to the final grayscale signal of each pixel point matches the expected display brightness corresponding to the initial grayscale signal of each pixel point, and it can reduce the requirements for the fast response speed of the light source in traditional Global Dimming, and can also compensate for the abnormal display brightness problem that may be caused by the change of current over time within one frame.

[0129] Embodiment 2

[0130] This embodiment mainly introduces how to specifically obtain the grayscale mapping relationship table for determining the final grayscale signal of each pixel point in each frame.

[0131] Assume that the duration T of each frame is 16.67 ms, the current of the light source can be adjusted in 5 equal steps, and the response time for the current to be adjusted between adjacent two levels is about 3.33 ms. The change rule of the corresponding light source brightness when switching between the maximum value and the second maximum value is as Figure 9 shown, where Figure 9 The equation representing the light source brightness change curve within one frame can be expressed as where

[0132] During the process of obtaining the grayscale mapping relationship table, the change rule of the light source brightness within one frame can be directly integrated according to the binary gray level number to determine the actual display brightness corresponding to each grayscale signal. It can be understood that in order to avoid the flickering situation when using the binary gray level number for gray level adjustment, consider splitting the binary gray level number by bits so that each bit plane except the bit plane 0 displays at least two LSBs to avoid the sudden change of brightness between frames.

[0133] For example, assume that the display bit depth is 8 bits, and the corresponding grayscale signal n = 8, and the distribution of the DMD bit planes is summarized as (a x = 0 or 1), where x refers to the bit plane number, x ∈ (0, 1, 2,..., n - 1), and a x corresponding weight is 2 x, meaning 2 per frame n - there will be 2 in the -1 LSB x a's x , a uniform arrangement is that there is one a in every adjacent 2 n-x LSB x , and a x is at the position of 2 in every 2 n-x , for example, n = 3, n-1-x Figure 18 shows the timing diagram of DMD flipping - the schematic diagram of display brightness when the gray - scale signal is 1 / 2. To represent the timing of DMD flipping more clearly, the corresponding relationship between the brightness of the gray - scale signal with a bit - depth of 3 and the DMD flipping timing is illustrated by the following example. As shown in the table, the (n - 1) - th bit - plane will be split into 2 Figure 10 LSBs, and then each LSB of each bit - plane will be evenly distributed in the DMD flipping timing. n-2

[0134] Table 1 DMD flipping timing diagram of 3 - bit system

[0135]

[0136]

[0137] Integrating the display timing diagram shown Figure 10 with respect to the time scale can obtain the actual display brightness accumulated for one frame of the image. At the same time, using the maximum displayable brightness to normalize the actual display brightness of multiple gray - scale signals, the integral schematic diagram of brightness change as shown Figure 11 is obtained. Further, sorting the actual display brightness of multiple gray - scale signals in ascending order to obtain the function curve of the sorted actual display brightness and the gray - scale signals from small to large as shown Figure 12 . It can be seen that G’ and G satisfy a good linear mapping relationship, which will simplify the signal - processing process. At the same time, since the final gray - scale signal corresponding to the original initial gray - scale signal ranked at the i - th position is still ranked at the i - th position, that is, Ind G’ = Ind G , so only the ratio of the final gray - scale signal G’ to the maximum displayable brightness and the proportional value of and L M need to be stored to determine the gray - scale mapping relationship between the initial gray - scale signal and the final gray - scale signal.

[0138] Example 3

[0139] This example introduces a method for obtaining the gray - scale mapping relationship table in a special case.

[0140] Assume that the change curve of the light - source brightness is as shown Figure 13 ​As shown, the rule of light source brightness change within a corresponding frame is where

[0141] In this case, the relationship between the grayscale signal and the actual display brightness is as Figure 14 shown. It can be seen that the actual display brightness is no longer a relationship that increases with the grayscale signal.

[0142] Sort the actual display brightness with fluctuations from small to large to obtain the corresponding relationship between the sorted actual display brightness and the grayscale signal as Figure 15 shown. For this case, it is necessary to match the predicted display brightness corresponding to the initial grayscale signal with the actual display brightness, and use the grayscale signal corresponding to the matched actual display brightness as the final grayscale signal corresponding to the initial grayscale signal to determine the corresponding relationship between the initial grayscale signal and the final grayscale signal, and use the mapping relationship between G’ and G to obtain the two-dimensional distribution of the final grayscale signal G’ to process the signal.

[0143] Embodiment 4

[0144] This application applies the above display method to the Figure 16 display device shown. As Figure 16 shown, the display device 10 of this application may include a memory 11 and a processor 12. A computer program is stored in the memory 11. The processor 12 is configured to execute the computer program to implement the steps of the above display method.

[0145] Optionally, as Figure 17 shown, the display device 10 may further include a light source 13 and a digital micromirror 14. Among them, the light source 13 is used to emit illumination light under the drive of a light source power supply. The digital micromirror 14 is used to modulate the illumination light to obtain the modulated light required for the display image. In addition, the processor 12 is coupled to the light source 13 and the digital micromirror 14. The processor 12 can be used to determine the target light source brightness within the current frame, and determine the final grayscale signal of each pixel point within the current frame based on the initial light source brightness, the target light source brightness, and the initial grayscale signal of each pixel point within the current frame. In addition, the processor 12 can also adjust the drive current of the light source 13 based on the target light source brightness within the current frame to adjust the brightness of the illumination light within the current frame; and the digital micromirror 14 is used to modulate the adjusted illumination light based on the final grayscale signal of each pixel point within the current frame to obtain the modulated light required for displaying each pixel point within the current frame.

[0146] Optionally, the processor 12 may include an image analysis processing unit 121 and a DMD recognizable decoder 122. The image analysis processing unit 121 is coupled to the memory 11. The image analysis processing unit 121 is configured to determine the target illumination brightness within the current frame and the final gray-scale signal of each pixel point, and transmit the determined target illumination brightness within the current frame to the digital micromirror 14 through the DMD recognizable decoder 122, so that the digital micromirror 14 can modulate the adjusted illumination light based on the final gray-scale signal of each pixel point within the current frame. And the image analysis processing unit 121 can also be used to adjust the brightness of the illumination light within the current frame by adjusting the current of the light source power supply based on the target light source brightness within the current frame.

[0147] The above are only the embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A display method, characterized in that, The method includes: Determining the maximum light source brightness, the initial light source brightness within the current frame, and the maximum initial gray signal within the current frame; Determining the target light source brightness within the current frame by multiplying the maximum light source brightness by the maximum initial gray signal within the current frame; Based on the initial light source brightness and the target light source brightness, selecting a part of the global brightness change rule to generate the light source brightness change rule within the current frame, and determining the final gray signal of each pixel point within the current frame based on the light source brightness change rule and the initial gray signal of each pixel point within the current frame; the global brightness change rule includes the rule that the light source brightness changes from the maximum light source brightness to the minimum light source brightness, or includes the rule that the light source brightness changes from the minimum light source brightness to the maximum light source brightness; or, Based on the initial light source brightness, the target light source brightness, and the initial gray signal of each pixel point within the current frame, determining the final gray signal of each pixel point within the current frame by looking up a gray mapping relationship table, where the gray mapping relationship table is determined according to the global brightness change rule; Displaying the current frame based on the final gray signal of each pixel point within the current frame.

2. The display method according to claim 1, characterized in that The determining the final gray signal of each pixel point within the current frame based on the light source brightness change rule and the initial gray signal of each pixel point within the current frame includes: When the initial light source brightness is different from the target light source brightness, combining multiple gray signals with the light source brightness change rule to obtain the actual display brightness corresponding to multiple gray signals; using the product of the initial gray signal of each pixel point within the current frame and the maximum light source brightness as the expected display brightness of each pixel point within the current frame, and using the gray signal corresponding to the actual display brightness that matches the expected display brightness of each pixel point within the current frame as the final gray signal of each pixel point within the current frame; or, When the initial light source brightness is equal to the target light source brightness, using the ratio of the maximum light source brightness to the initial light source brightness as the first ratio, and the product of the initial gray signal of each pixel point within the current frame and the first ratio is the final gray signal of each pixel point within the current frame.

3. The display method according to claim 1, characterized in that, The light source brightness is divided into M levels, and the displaying the current frame includes: During the process of displaying the current frame, adjusting one level of the light source brightness, or not adjusting the light source brightness, so that the light source brightness is only adjusted between M levels of light source brightness, thereby reducing the uncertainty of the light source brightness change.

4. The display method according to claim 3, wherein The drive current of the light source is divided into M levels, and adjusting one level of the light source brightness includes: During the process of displaying the current frame, adjusting one level of the drive current to adjust one level of the light source brightness.

5. The display method according to claim 3, characterized in that The determining the target light source brightness within the current frame by multiplying the maximum light source brightness by the maximum initial gray signal within the current frame includes: Calculating the product of the maximum initial gray signal within the current frame and the maximum light source brightness; Determining the interval formed by the two adjacent levels of light source brightness where the product is located; When the initial light source brightness is greater than the maximum value of the interval, reducing one level of the initial light source brightness level to obtain the level of the target light source brightness; or, When the initial light source brightness is less than the maximum value of the interval, increase the level of the initial light source brightness by one level to obtain the level of the target light source brightness; or, When the initial light source brightness is equal to the maximum value of the interval, the target light source brightness is equal to the initial light source brightness.

6. The display method according to claim 3, wherein Before determining the final gray signal of each pixel in the current frame by looking up the gray mapping relationship table based on the initial light source brightness, the target light source brightness, and the initial gray signal of each pixel in the current frame, it includes: Determine various adjustment situations of the light source brightness; Based on the initial light source brightness and the target light source brightness of each adjustment situation, determine the light source brightness change rule of each adjustment situation; Based on the light source brightness change rule, determine the final gray signal corresponding to all feasible initial gray signals; Save the correspondence between all feasible initial gray signals and the final gray signal in each adjustment situation to the gray mapping relationship table.

7. The display method according to claim 6, wherein The method further includes: Based on the light source brightness change rule, determine the feasible maximum display brightness in each adjustment situation; Calculate the ratio of the feasible maximum display brightness to the maximum light source brightness in each adjustment situation, Save the ratio to the gray mapping relationship table.

8. The display method according to claim 6, wherein In the adjustment situation where the target light source brightness is smaller than the initial light source brightness, the initial gray signal smaller than the second ratio is the feasible initial gray signal, where the second ratio is the ratio of the initial light source brightness to the maximum light source brightness.

9. A display device, characterized in that, The display device includes a memory and a processor; a computer program is stored in the memory, and the processor is configured to execute the computer program to implement the steps of the method according to any one of claims 1-8.

10. The display device according to claim 9, wherein The display device further includes: a light source and a digital micromirror coupled to the processor, wherein the light source is configured to emit illumination light; The digital micromirror is configured to modulate the illumination light to obtain the modulated light required for the display image; The processor is configured to determine the target light source brightness in the current frame, determine the final gray signal of each pixel in the current frame based on the initial light source brightness, the target light source brightness, and the initial gray signal of each pixel in the current frame, adjust the driving current of the light source based on the target light source brightness to adjust the brightness of the illumination light in the current frame; and the digital micromirror is configured to modulate the adjusted illumination light based on the final gray signal of each pixel in the current frame to obtain the modulated light required for displaying each pixel in the current frame.

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