Brightness adjustment method, display driving apparatus, storage medium, and program product

Abstract

The present disclosure provides a brightness adjustment method, a display driving device, a storage medium and a program product. The brightness adjustment method comprises: obtaining a target display brightness corresponding to a display brightness adjustment instruction; determining a duty cycle of a pulse width modulation signal as a target duty cycle according to the target display brightness; adjusting the pulse width of the second level interval of each pulse period in the pulse width modulation signal by a preset dimming method until the duty cycle of the pulse width modulation signal is the target duty cycle, and the preset dimming method comprises a first dimming stage and a second dimming stage. The first dimming stage is configured to adjust the pulse width of the second level interval in each second pulse period by a preset pulse width as a step. The second dimming stage is configured to adjust the pulse width of the second level interval in the first pulse period and each second pulse period by a preset pulse width as a step. The present disclosure increases the dimming level and alleviates the problem of deterioration of the service life of the light emitting material caused by the PWM dimming in the related art.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of display. More particularly, it relates to a brightness adjustment method, a display driving device, a storage medium and a program product. BACKGROUND

[0002] At present, AMOLED (Active-matrix organic light-emitting diode) display screens have become the basic configuration of medium and high-end smart phones due to their wide color gamut, high refresh rate, thin thickness, high contrast ratio and other advantages. The adjustment of the brightness of the AMOLED screen generally includes a DC (Direct Current) dimming mode and a PWM (Pulse Width Modulation) dimming mode.

[0003] The PWM dimming mode adjusts the brightness of the display screen by controlling the time of pixel light and darkness, and the frequency of light and darkness alternation is the PWM refresh frequency. The applicant has found that the related PWM dimming method has the technical problems of fewer dimming levels and deterioration of the service life of the light-emitting material. SUMMARY

[0004] The purpose of the present disclosure is to provide a brightness adjustment method, a display driving device, a storage medium and a program product to solve the technical problems of fewer dimming levels and deterioration of the service life of the light-emitting material in the related PWM dimming method.

[0005] To achieve the above-mentioned purpose, the present disclosure adopts the following technical solutions:

[0006] The first aspect of the present disclosure provides a brightness adjustment method suitable for a display panel, comprising the following steps:

[0007] When the display brightness of the display panel is adjusted in response to a display brightness adjustment instruction, the target display brightness corresponding to the display brightness adjustment instruction is obtained;

[0008] The duty cycle of the pulse width modulation signal is determined as the target duty cycle according to the target display brightness, the pulse width modulation signal includes a first number of pulse periods, each pulse period includes a first level interval and a second level interval, the duty cycle represents the ratio of the first time to the second time, the first time represents the sum of the pulse widths corresponding to the first level interval or the second level interval of each pulse period within the second time, and the second time represents the display time of one frame of image;

[0009] The pulse width of the second level interval in each pulse period of the pulse width modulation signal is adjusted by a preset dimming method until a duty cycle of the pulse width modulation signal is the target duty cycle, wherein the first quantity of pulse periods comprises a first pulse period, and the pulse periods other than the first pulse period are second pulse periods, an initial pulse width corresponding to the second level interval in the first pulse period is a first pulse width, an initial pulse width corresponding to the second level interval in the second pulse period is a second pulse width, the second pulse width is smaller than the first pulse width, the preset dimming method comprises a first dimming stage and a second dimming stage, the first dimming stage is configured to adjust the pulse width of the second level interval in each second pulse period by a preset pulse width as a step, and when the pulse width corresponding to the second level interval in each second pulse period is the first pulse width, the second dimming stage is entered, and the second dimming stage is configured to adjust the pulse width of the second level interval in the first pulse period and each second pulse period by the preset pulse width as a step.

[0010] Optionally, a relationship between the first pulse width and the second pulse width satisfies B1=B2+nS, wherein B1 represents the first pulse width, B2 represents the second pulse width, S represents the preset pulse width, and n is a positive integer.

[0011] Optionally, the first level interval is a high level interval, the second level interval is a low level interval, the first pulse width is equal to a pixel data writing time corresponding to the display panel, and the preset pulse width is a minimum adjustment unit of the pulse width of the display panel.

[0012] Optionally, the first dimming stage is configured to adjust the pulse width of the second level interval in each second pulse period by the preset pulse width as a step in a first order, and the second dimming stage is configured to adjust the pulse width of the second level interval in the first pulse period and each second pulse period by the preset pulse width as a step in a second order, wherein in the second order, an adjustment priority of the first pulse period is higher than an adjustment priority of the second pulse period, and an adjustment order of each second pulse period is the first order.

[0013] Optionally, the first pulse period is a first pulse period in the first quantity of pulse periods, and the first order satisfies that when the pulse width of the second level interval in each second pulse period is adjusted in the first order, an adjustment order of each second pulse period is arranged in a scattered manner in a time dimension of the first quantity of pulse periods.

[0014] Optionally, when the first number is 8, the pulse width modulation signal comprises 8 pulse periods Ti, the first order of adjusting each second pulse period in the first dimming stage is: T5, T3, T7, T2, T6, T4, T8, and the second order of adjusting the first pulse period and each second pulse period in the second dimming stage is: T1, T5, T3, T7, T2, T6, T4, T8, wherein Ti represents the i-th pulse period, i is greater than or equal to 1 and less than or equal to 8.

[0015] Optionally, when the first number is 24, the pulse width modulation signal comprises 24 pulse periods Ti, the first order of adjusting each second pulse period in the first dimming stage is: T13, T7, T19, T4, T16, T10, T22, T2, T14, T8, T20, T5, T17, T11, T23, T3, T15, T9, T21, T6, T18, T12, T24, and the second order of adjusting the first pulse period and each second pulse period in the second dimming stage is: T1, T13, T7, T19, T4, T16, T10, T22, T2, T14, T8, T20, T5, T17, T11, T23, T3, T15, T9, T21, T6, T18, T12, T24, wherein Ti represents the i-th pulse period, i is greater than or equal to 1 and less than or equal to 24.

[0016] Optionally, the first dimming stage comprises a plurality of first dimming units, each of the first dimming units is configured to adjust the pulse width of the second level interval of each second pulse period in the first order with a preset pulse width as a step, and the pulse width of the second level interval of each second pulse period is the same and changes by one preset pulse width when the first dimming unit ends; the second dimming stage comprises a plurality of second dimming units, each of the second dimming units is configured to adjust the pulse width of the second level interval of the first pulse period and each second pulse period in the second order with a preset pulse width as a step, and the pulse width of the second level interval of the first pulse period and each second pulse period is the same and changes by one preset pulse width when the second dimming unit ends.

[0017] The second aspect of the present disclosure provides a display driving device, comprising a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the brightness adjustment method as described above when executing the program.

[0018] The third aspect of the present disclosure provides a computer readable storage medium, which stores a computer program, wherein the program is executed by a processor to implement the steps of the brightness adjustment method as described above.

[0019] A fourth aspect of the present disclosure provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the brightness adjustment method as described above.

[0020] The beneficial effects of the present disclosure are as follows:

[0021] The brightness adjustment method of the embodiments of the present disclosure divides the preset dimming method into two stages, i.e., a first dimming stage and a second dimming stage, and sets the initial pulse width of the second level interval in the first pulse period as a first pulse width, the initial pulse width of the second level interval in the second pulse period as a second pulse width, and the second pulse width is smaller than the first pulse width. At the same time, the dimming step in the first dimming stage and the second dimming stage is a preset pulse width. When the preset dimming method is used for brightness adjustment, on the one hand, the first dimming stage and the second dimming stage are adjusted to each pulse period with a preset pulse width as a step, the dimming step is small, and in the initial state, only one first pulse width and a plurality of smaller second pulse widths are included. At this time, the initial black insertion ratio is low, so the dimming step number can be increased, and the dimming level is increased. On the other hand, when the initial black insertion ratio is low, the maximum light-emitting time length occupies a large proportion, which can effectively alleviate the problem of deterioration of the service life of the light-emitting material in the related art PWM dimming mode. BRIEF DESCRIPTION OF DRAWINGS

[0022] The specific embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0023] Figure 1 A schematic diagram of the principle of PWM dimming in the related art is shown;

[0024] Figure 2 A schematic diagram of the principle of PWM dimming mode 1 in the related art is shown;

[0025] Figure 3 A schematic diagram of the principle of PWM dimming mode 2 in the related art is shown;

[0026] Figure 4 A flowchart of the dimming method provided by the embodiments of the present disclosure is shown;

[0027] Figure 5 A schematic diagram of the principle of the dimming method provided by the embodiments of the present disclosure is shown;

[0028] Figure 6 A schematic diagram of dimming a display panel with a 60Hz frame frequency and a 240Hz PWM dimming frequency by using the preset dimming method is shown;

[0029] Figure 7 A schematic diagram of the number of brightness changes when sequentially adjusting by using PWM dimming mode 2 in a 4-pulse scenario is shown;

[0030] Figure 8 Fig. 8 is a schematic diagram of the number of times of brightness change when the display panel with 60Hz frame frequency and 480Hz PWM dimming frequency is dimmed by the preset dimming method in the 8-pulse scenario;

[0031] Figure 9 Fig. 4 is a schematic diagram of the number of times of brightness change when the display panel with 60Hz frame frequency and 480Hz PWM dimming frequency is dimmed by the preset dimming method in the 4-pulse scenario;

[0032] Figure 10 Fig. 7 is a schematic diagram of the dimming process of D1 in the 8-pulse scenario;

[0033] Figure 11 Fig. 8 is a schematic diagram of the number of times of brightness change when the display panel with 60Hz frame frequency and 480Hz PWM dimming frequency is dimmed by the preset dimming method in the 8-pulse scenario;

[0034] Figure 12 Fig. 13 is a schematic diagram of the dimming process of D(n+2) in the 8-pulse scenario;

[0035] Figure 13 Fig. 14 is a schematic diagram of the dimming process of D(n+3) in the 8-pulse scenario; Figure 12

[0036] Fig. 15 is a schematic diagram of the dimming process of D(n+4) in the 8-pulse scenario; Figure 14 Figure 12 Fig. 16 is a schematic diagram of the dimming process of D(n+5) in the 8-pulse scenario;

[0037] Figure 15 Figure 12 Fig. 17 is a schematic diagram of the dimming process of D(n+6) in the 8-pulse scenario;

[0038] Figure 16 Fig. 18 is a schematic diagram of the dimming process of D(n+7) in the 8-pulse scenario; Figure 12

[0039] Fig. 19 is a schematic diagram of the dimming process of D(n+8) in the 8-pulse scenario; Figure 17 Figure 12 Fig. 20 is a schematic diagram of the dimming process of D(n+9) in the 8-pulse scenario;

[0040] Figure 18 Figure 12 Fig. 21 is a schematic diagram of the dimming process of D(n+10) in the 8-pulse scenario. DETAILED DESCRIPTION

[0041] In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be described clearly and completely below with reference to the drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by a person of ordinary skill in the art without any inventive effort fall within the protection scope of the present disclosure. ​​​​

[0042] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “including,” “comprising,” or “containing,” and similar terms mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. The terms “connected,” “linked,” or similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” and “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0043] To better understand the technical solution of this disclosure, the inventive concept of this disclosure will first be described in detail.

[0044] AMOLED displays have become a standard feature in mid-to-high-end smartphones due to their advantages such as wide color gamut, high refresh rate, thinness, and high contrast. Brightness adjustment for AMOLED screens generally includes DC dimming and PWM dimming modes. PWM dimming adjusts screen brightness by controlling the duration of pixel brightness changes; the frequency of these alternations is the PWM dimming frequency.

[0045] Please refer to Figure 1 , Figure 1 This is a schematic diagram illustrating the principle of PWM dimming in related technologies, such as... Figure 1 As shown, taking a display panel with a 60Hz frame rate (i.e., displaying 60 frames per second) and a 240Hz PWM dimming frequency as an example, assuming the frame rate is denoted as f1 and the PWM dimming frequency as f2, then f1 = 60Hz, f2 = 240Hz, and the number of black insertions = f2 / f1. This means each frame requires 4 black insertions. Therefore, displaying one frame involves 4 emission-on and emission-off cycles, each consisting of one emission phase and one emission-off phase. Assuming the time occupied by each emission-off cycle is T, then T satisfies the following condition: T = t0 / (f2 / f1), where t0 represents the time occupied by displaying one frame on the display panel. For example, for any display panel, t0 = 1 / f1, in which case T = t0 / f2.

[0046] for Figure 1The display panel shown requires that, within the display time of one frame, at least one of the four non-light-emitting stages must write pixel data (such as RGB data), and the duration of this non-light-emitting stage must be greater than the pixel data writing duration; otherwise, the voltage corresponding to that pixel data cannot be written. The pixel data writing stage is... Figure 1 The time period corresponding to data transfer and OLED setup. For Figure 1 In any given light-emitting-non-emitting cycle, assuming the duration of the non-emitting phase is denoted as t1 and the duration of the light-emitting phase is denoted as t2, then t1 + t2 = T. PWM dimming adjusts the proportion of the light-emitting phase (or non-emitting phase) within each light-emitting-non-emitting cycle, thereby achieving brightness adjustment.

[0047] In related technologies, PWM dimming methods mainly include the following two types:

[0048] (1) PWM dimming mode 1

[0049] PWM dimming mode 1 Figure 2 As shown, Figure 2 Pulse 1, pulse 2, pulse 3, and pulse 4 correspond to respectively Figure 1 The four light-emitting and non-light-emitting cycles (pulse cycles) in the text. Figure 2 The pulse width represents the duration of the non-emission phase within each emission-non-emission cycle. Operation phase 0 represents the initialization phase. In the initialization phase, the pulse width of the non-emission phase of pulse 1 (corresponding to the high-level interval) is B, and the pulse width of the non-emission phases of pulses 2 to 4 is 0. During dimming, the pulse widths of the non-emission phases of pulses 2 to 4 are first adjusted sequentially in steps of B (i.e., operation phase 1). Once the pulse widths of all non-emission phases of pulses 2 to 4 are B, operation phase 2 begins. In operation phase 2, the pulse widths of the non-emission phases of pulses 1 to 4 are adjusted sequentially in steps of S. For operation phase 2 and all subsequent operation phases, after each operation phase, the non-emission phases of pulses 1 to 4 have the same pulse width, and the pulse width increases by one step S compared to the previous operation phase. Figure 2The grayscale fill is used to clearly show the adjustment sequence of each pulse cycle. Here, B is the initial black insertion width, and S is the minimum black insertion adjustment step of the display panel. Both B and S are in units of 1H duration, where 1H represents one row of pixels. The 1H duration represents the display time occupied by one row of pixels during the display of one frame of an image. B and S can include one or more 1H durations. For example, 1H duration = 1 / (f1*(Y0+VFP+VS+VBP)), where Y0 represents the vertical resolution of the display panel, (VFP+VS+VBP) represents the time occupied by displaying each frame of an image without actually displaying data. Specifically, VFP represents the leading edge of the frame, VBP represents the trailing edge of the frame, and VS represents the width of the frame synchronization signal. The units of VFP, VS, and VBP are the time occupied by one row of pixels. The calculated 1H duration represents the display time of each row of pixels in the display panel.

[0050] from Figure 2 It can be seen that in PWM dimming mode 1, the dimming step size (operation stage 1) is too large (step size is B). On the one hand, an excessively large step size will reduce the number of dimming steps, resulting in fewer dimming levels. On the other hand, an excessively large step size will also lead to imprecise dimming, and the brightness may change drastically during the dimming process.

[0051] (2) PWM dimming mode 2

[0052] PWM dimming mode 2, as shown Figure 3 As shown, the difference between PWM dimming mode 1 and PWM dimming mode 2 is that, in the initialization phase, the pulse width of the non-emitting phases of pulses 1 to 4 is B. During dimming, the pulse width of the non-emitting phases of pulses 1 to 4 is adjusted sequentially in steps of S in each operation phase. After each operation phase, the non-emitting phases of pulses 1 to 4 have the same pulse width, and the pulse width increases by one step S compared to the previous operation phase.

[0053] from Figure 3 It can be seen that PWM dimming mode 2 solves the technical problems of reduced dimming steps and imprecise dimming caused by excessively large step size in PWM dimming mode 1. However, in PWM dimming mode 2, since the pulse width of the non-light-emitting stages of pulses 1 to 4 in the initialization phase is all B, on the one hand, the high initial black insertion ratio (the black insertion ratio is the ratio of the sum of the durations of each non-light-emitting stage to the display time of a frame) will lead to a reduction in the number of subsequent dimming steps and dimming levels; on the other hand, the large initial black insertion ratio will cause a sharp decrease in the maximum light-emitting duration ratio (the light-emitting duration ratio is the ratio of the sum of the durations of each light-emitting stage to the display time of a frame, and the maximum light-emitting duration ratio is the light-emitting duration ratio corresponding to the initial black insertion ratio), which will degrade the lifespan of the light-emitting material.

[0054] Wherein the luminous intensity of the light-emitting material decreases with the increase of the light-emitting time. In general engineering, the lifetime of the light-emitting material is defined as the time required for the luminous intensity to decrease to 95% of the initial luminous intensity. In the display panel, to obtain the same actual luminance, the higher the black insertion ratio, the higher the luminance required by the light-emitting stage pixel, that is, the light-emitting material works at a larger current, which will affect the lifetime of the light-emitting material and make the lifetime of the light-emitting material shorter.

[0055] For the PWM dimming method, due to the periodic light-emitting-non-emitting of the light-emitting pixel, when the PWM frequency is low, flicker problem is prone to occur. In order to reduce the flicker, 1440 PWM dimming, 1920 PWM dimming, 2160 PWM dimming and 3840 PWM dimming are usually used in the related art. Among them, 1440 PWM dimming means that the resolution of the display panel is 1440*2560 and the PWM dimming frequency is 1440Hz; 1920 PWM dimming means that the resolution of the display panel is 1920*1080 and the PWM dimming frequency is 1920Hz; 2160 PWM dimming means that the resolution of the display panel is 2160*3840 and the PWM dimming frequency is 2160Hz; and 3840 PWM dimming means that the resolution of the display panel is 3840*2160 and the PWM dimming frequency is 3840Hz.

[0056] For any display panel, when the frame frequency f1 remains unchanged, the higher the PWM dimming frequency, the more the number of pulse periods within one frame display time. At this time, when the PWM dimming mode 2 is used for luminance adjustment, the initial black insertion ratio is too large, which has a more serious impact on the lifetime of the light-emitting material and the number of dimming steps. At the same time, if the vertical resolution of the display panel is low, the 1H time is large, and when the number of black insertion rows corresponding to B and S remains unchanged, the black insertion ratio will increase, which will also cause a more serious impact on the lifetime of the light-emitting material and the number of dimming steps.

[0057] It can be understood that the display panel in the embodiments of the present disclosure can include various display panels, which can be selected and set according to actual needs. For example, in addition to the AMOLED display panel, the display panel can also be an organic light-emitting diode (OLED) display panel, a quantum dot light-emitting diode (QLED) display panel, or a micro light-emitting diode (Micro LED) display panel, etc.

[0058] To solve the above technical problems, the present disclosure provides a brightness adjustment method suitable for a display panel, a display driving device and a storage medium. The following will be described in detail in combination with specific embodiments.

[0059] Please refer to Figure 4 , Figure 4 The flowchart of the brightness adjustment method provided by the present disclosure is shown in Figure 4 The brightness adjustment method comprises the following steps:

[0060] Step S101, in response to the display brightness adjustment instruction for adjusting the display brightness of the display panel, the target display brightness corresponding to the display brightness adjustment instruction is obtained.

[0061] For any display panel, the user can adjust the display brightness of the display panel. Among them, the common method of adjusting the display brightness includes using shortcut keys, operating system settings, display screen buttons and the like.

[0062] For example, when adjusting the display brightness using shortcut keys, the user's operation on the shortcut keys is equivalent to the display brightness adjustment instruction, and the display brightness adjustment instruction carries the display brightness information, which indicates the target display brightness. For example: most notebook computer keyboards are equipped with a special brightness adjustment key, usually one of the function keys F1-F12, which has a sun logo or a light source icon. Press the combination key of the function key and the brightness adjustment logo, usually Fn key plus brightness adjustment key, such as Fn+F5 or Fn+F6, and hold down the brightness adjustment key until the desired brightness, and the setting will take effect after releasing the key.

[0063] For example, when adjusting the display brightness in the operating system, the screen brightness can be adjusted by dragging the brightness slider. Different positions of the brightness slider in the brightness bar can represent different display brightness. At this time, the user's operation on the brightness slider is equivalent to the display brightness adjustment instruction, and the display brightness adjustment instruction carries the target display brightness.

[0064] In addition, the display brightness can also be adjusted through the "display and brightness" in the control center or settings.

[0065] Step S102, according to the target display brightness, determine the duty cycle of the pulse width modulation signal as the target duty cycle, the pulse width modulation signal includes a first number of pulse periods, each pulse period includes a first level interval and a second level interval, the duty cycle represents the ratio of the first time to the second time, the first time represents the sum of the pulse width corresponding to the first level interval or the second level of each pulse period within the second time, and the second time represents the display time of a frame of image.

[0066] The pulse width modulation (PWM) signal includes a plurality of pulse periods, each pulse period includes a first level and a second level, the first level represents one of high level and low level, and the second level represents the other one of high level and low level. For example, the first level is high level (represented by 1), and the second level is low level (represented by 0). In the time dimension, each pulse period includes a first level interval (representing the pulse width of the first level) and a second level interval (representing the pulse width of the second level), i.e., each pulse period includes a high level interval and a low level interval.

[0067] In a possible implementation, the PWM signal includes a first number of pulse periods, where the first number represents the number of pulse periods included in the PWM signal within the display time of a frame of image. For a display panel with a known frame frequency (f1) and PWM dimming frequency (f2), the number of pulse periods of the PWM signal corresponding to the display of a frame of image is fixed. For example, for a display panel with a 60 Hz frame frequency and a 240 Hz PWM dimming frequency, the PWM signal corresponding to the display of a frame of image includes 4 pulse periods (as shown in FIG. 1), i.e., the first number is 4; for a display panel with a 60 Hz frame frequency and a 480 Hz PWM dimming frequency, the PWM signal corresponding to the display of a frame of image includes 8 pulse periods, i.e., the first number is 8; for a display panel with a 60 Hz frame frequency and a 1440 Hz PWM dimming frequency, the PWM signal corresponding to the display of a frame of image includes 24 pulse periods, i.e., the first number is 24, and so on. Figure 1

[0068] The duty cycle of the PWM signal can be represented by the ratio of the high level interval (or the low level interval) in the PWM signal to the overall time of the PWM signal. Alternatively, the duty cycle of the PWM signal represents the ratio of the first time to the second time, the first time represents the sum of the pulse widths corresponding to the first level interval or the second level interval of each pulse period within the second time, and the second time represents the display time of a frame of image. Please refer to Figure 5 Figure 5 The PWM signal and the pixel emitting-non-emitting corresponding relationship are shown in FIG. 2. Figure 5 ​​As shown, it is assumed that one frame of display time includes 4 pulse periods, the pulse width of each pulse period can be represented as T, the pulse width corresponding to the low level interval is represented as t1, the pulse width corresponding to the high level interval is represented as t2, t1+t2=T, the second time is t0, and t0=4*T, the first time is the sum of t1 of pulse 1 to pulse 4, and it can be understood that the first time can also be the sum of t2 of pulse 1 to pulse 4. Since the duty cycle of the PWM signal has a corresponding relationship with the display brightness of the display panel, the duty cycle of the PWM signal can be determined according to the target display brightness.

[0069] In step S103, the pulse width of the second level interval of each pulse period in the pulse width modulation signal is adjusted by a preset dimming method until the duty cycle of the pulse width modulation signal is the target duty cycle, wherein the first number of pulse periods includes a first pulse period, the pulse periods other than the first pulse period are second pulse periods, the initial pulse width corresponding to the second level interval in the first pulse period is a first pulse width, the initial pulse width corresponding to the second level interval in the second pulse period is a second pulse width, the second pulse width is smaller than the first pulse width, the preset dimming method includes a first dimming stage and a second dimming stage, the first dimming stage is configured to adjust the pulse width of the second level interval in each second pulse period by a preset pulse width as a step, and when the pulse width corresponding to the second level interval in each second pulse period is the first pulse width, the second dimming stage is entered, and the second dimming stage is configured to adjust the pulse width of the second level interval in the first pulse period and each second pulse period by the preset pulse width as a step.

[0070] In a possible implementation, the first level interval is a high level interval, and the second level interval is a low level interval, and when the brightness is adjusted by the preset dimming method, the pulse width of the low level interval of each pulse period is adjusted. Similarly, when the first level interval is a low level interval and the second level interval is a high level interval, the pulse width of the high level interval of each pulse period is adjusted by the preset dimming method. In the embodiments of the present disclosure, the first level interval is a high level interval, and the second level interval is a low level interval.

[0071] In one possible implementation, when the pulse width of the second-level interval of each pulse period in the pulse width modulation signal is adjusted using a preset dimming method until the duty cycle of the pulse width modulation signal reaches the target duty cycle, if the current display brightness of the display panel is greater than the target display brightness, the display brightness needs to be reduced. Since the second-level interval is a low-level interval, the pulse width of the second-level interval in each pulse period is adjusted by increasing the pulse width of the second-level interval in steps of a preset pulse width until the duty cycle of the PWM signal reaches the target duty cycle corresponding to the target display brightness. Similarly, if the current display brightness is less than the target display brightness, the display brightness needs to be increased. Therefore, the pulse width of the second-level interval in each pulse period is adjusted by decreasing the pulse width of the second-level interval in steps of a preset pulse width until the duty cycle of the PWM signal reaches the target duty cycle corresponding to the target display brightness. Similarly, when the second level interval is a high level interval, if the current display brightness of the display panel is greater than the target display brightness, the display brightness needs to be reduced. In this case, the pulse width of the second level interval in each pulse cycle is adjusted by decreasing the pulse width of the second level interval in steps with a preset pulse width until the duty cycle of the PMW signal reaches the target duty cycle corresponding to the target display brightness.

[0072] Please refer to Figure 6 , Figure 6 This is a schematic diagram illustrating the dimming process of a display panel with a 60Hz frame rate and a 240Hz PWM dimming frequency using a preset dimming method. Figure 6 As shown in this embodiment, the PWM signal corresponding to one frame of image includes four pulse cycles, denoted as pulse 1, pulse 2, pulse 3, and pulse 4. These four pulse cycles are then divided into two categories, denoted as the first pulse cycle and the second pulse cycle. When adjusting the duty cycle of the PWM signal, different adjustments are made for the first and second pulse cycles. Since pixel data must be written in one of the four pulse cycles, the pulse width (low-level interval) of the low-level signal in one pulse cycle must be greater than the pixel data writing time. In this embodiment, the pulse cycle for which pixel data needs to be written is designated as the first pulse cycle. Therefore, in the four pulse cycles, one pulse cycle is designated as the first pulse cycle, and the remaining pulse cycles are designated as the second pulse cycle.

[0073] For example, pulse 1 is the first pulse period, which means the first of four pulse periods in the time dimension, and the remaining pulse periods are the second pulse periods (including pulse 2, pulse 3, and pulse 4). It can be understood that any of the second pulse periods can also be used as the pulse period for writing pixel data.

[0074] In one possible implementation, for any display panel, since the pixel data writing time has a minimum value and is fixed (let's say B), and the minimum pulse width adjustment unit (i.e., the minimum black insertion adjustment step, let's say S0) of the display panel is also fixed, in the preset dimming scheme, assuming that the initial pulse width corresponding to the second level interval (low level interval) in the first pulse period is the first pulse width B1, then the first pulse width B1 is greater than or equal to the pixel data writing time B corresponding to the display panel, and the preset pulse width S (step) in the dimming process is greater than or equal to the minimum pulse width adjustment unit S0.

[0075] Optionally, the relationship between the first pulse width and the second pulse width satisfies: B1 = B2 + nS, where B1 represents the first pulse width, B2 represents the second pulse width, S represents the preset pulse width, and n is a positive integer. The second pulse width B2 is a value greater than or equal to 0, and the second pulse width B2 is less than the first pulse width B1.

[0076] In one possible implementation, in order to alleviate the technical problems of low maximum light emission duration, deterioration of light-emitting material lifespan, and limited dimming levels caused by an excessively large initial black insertion ratio in PWM dimming mode 2, this embodiment sets the first pulse width B1 to be equal to the pixel data writing time (B), the preset pulse width S to be equal to the minimum pulse width adjustment unit (S0), and the second pulse width B2 to be equal to 0. With this setting, in the initialization stage, the initial black insertion ratio k = B / (4*T) is much smaller than the initial black insertion ratio in PWM dimming mode 2, thus significantly improving the technical problems of limited dimming levels and deterioration of light-emitting material lifespan during PWM dimming.

[0077] In one possible implementation, the first dimming stage includes a plurality of first dimming units, each of which is configured to sequentially adjust the pulse width of the second level interval of each second pulse cycle in a first order with a preset pulse width as the step size. When the first dimming unit ends, the pulse width of the second level interval of each second pulse cycle is the same and the change amount is a preset pulse width. The second dimming stage includes a plurality of second dimming units, each of which is configured to sequentially adjust the pulse width of the second level interval of the first pulse cycle and each second pulse cycle in a second order with a preset pulse width as the step size. When the second dimming unit ends, the pulse width of the second level interval of the first pulse cycle and each second pulse cycle is the same and the change amount is a preset pulse width.

[0078] For example, such as Figure 6 As shown, the preset dimming method includes a first dimming stage and a second dimming stage, wherein the first dimming stage includes n first dimming units (corresponding to...). Figure 6In the n operation stages (1 to n), the second dimming stage includes i second dimming units (corresponding Figure 6 In the i operation stages (n+1 to n+i), the number n of the first dimming units is related to the first pulse width B1, the second pulse width B2, and the preset pulse width S, specifically, n satisfies B1=B2+nS, after the n first dimming units, the pulse width of the second level interval in the first pulse period and each second pulse period is B1, at this time, the first dimming stage ends and the second diming stage starts. The number i of the second dimming units in the second dimming stage is related to the first pulse width B1, the preset pulse width S, and the pulse width T of each pulse period, assuming that the number of the second dimming units is i, then B1+iS needs to be less than or equal to the pulse width T.

[0079] Compared with the related art, the brightness adjustment method of the embodiment of the present disclosure divides the preset dimming method into two stages, namely the first dimming stage and the second dimming stage, sets the initial pulse width of the second level interval in the first pulse period as the first pulse width, sets the initial pulse width of the second level interval in the second pulse period as the second pulse width, and the second pulse width is less than the first pulse width, and the dimming step in the first dimming stage and the second dimming stage is the preset pulse width. When the preset dimming method is used for brightness adjustment, on the one hand, the first dimming stage and the second dimming stage are both adjusted with the preset pulse width as the step, the dimming step is small, and in the initial state, only one first pulse width and multiple second pulse widths are included, at this time, the initial black insertion ratio is low, so the dimming step number can be increased and the dimming gear can be increased. On the other hand, when the initial black insertion ratio is low, the maximum light-emitting duration ratio is large, which can effectively alleviate the problem of deterioration of the service life of the light-emitting material in the PWM dimming mode of the related art.

[0080] In the embodiment of the present disclosure, the pulse width of each pulse period is the same in the display time of one frame of image, but the proportion of the high level interval and the low level interval in each pulse period is different. The duty cycle of the PMW signal is adjusted, that is, the proportion of the high level interval or the low level interval in each pulse period is adjusted, which can be adjusted separately for each pulse period. In specific implementation, the adjustment order of each pulse period can be preset, for example, the adjustment order of each second pulse period in the first dimming stage is set as the first order, and the adjustment order of the first pulse period and each second pulse period in the second dimming stage is set as the second order.

[0081] In a possible implementation, the first dimming stage is configured to sequentially adjust the pulse width of the second level interval in each second pulse period in a first order with a preset pulse width as a step, and the second dimming stage is configured to sequentially adjust the pulse width of the first pulse period and the second level interval in each second pulse period in a second order with the preset pulse width as a step. The second order satisfies that the adjustment priority of the first pulse period is higher than that of the second pulse period in the second order, and the adjustment order of each second pulse period is the first order.

[0082] The applicant has found through research that the PWM dimming mode 1 and the PWM dimming mode 2 in the related art sequentially adjust each pulse period within a frame of display time. Taking a PMW signal including four pulse periods as an example, the adjustment is performed in the order of pulse 1, pulse 2, pulse 3, and pulse 4. In the adjustment process, the pulse width of the low level interval (or the high level interval) of each pulse period is inconsistent, which causes brightness variation within a frame, and the brightness variation frequency is the flicker frequency. Please refer to Figure 7 and Figure 8 , Figure 7 FIG. 4 is a diagram of the number of brightness variations within a frame of display time when each pulse period is sequentially adjusted by the PWM dimming mode 2 in a 4-pulse scenario (a PMW signal including four pulse periods within a frame of display time), Figure 8 FIG. 5 is a diagram of the number of brightness variations within a frame of display time when each pulse period is sequentially adjusted by the PWM dimming mode 2 in an 8-pulse scenario (a PMW signal including eight pulse periods within a frame of display time), where the brightness variation refers to the brightness variation caused by the inconsistent pulse width of the low level interval (or the high level interval) of the pulse period. As can be seen from Figure 7 in the 4-pulse scenario, the number of brightness variations within a frame caused by the inconsistent pulse width when each pulse is sequentially adjusted is 0 or 2; as can be seen from Figure 8 in the 8-pulse scenario, the number of brightness variations within a frame caused by the inconsistent pulse width when each pulse is sequentially adjusted is also 0 or 2. The number of brightness variations affects the flicker frequency, and the higher the flicker frequency, the less likely the user's eyes can perceive the flicker.

[0083] In order to further reduce the flicker of the display panel and improve the display effect of the display panel, in a possible implementation, the first order and the second order are further limited. Specifically, when the pulse width of the second level interval in each second pulse period is sequentially adjusted in the first order, the adjustment order of each second pulse period is dispersedly arranged in the time dimension of the first number of pulse periods.

[0084] The dispersed arrangement can be represented as, in the time dimension of the first number of pulse periods, that is, in the display time of a frame of image, each pulse period is not adjusted in sequence but is adjusted in a disorderly manner.

[0085] For example, as shown in FIG. 3, Figure 6 In the first dimming stage, the first sequence is pulse 3, pulse 2, pulse 4, that is, in the first dimming stage, pulse 3 is first adjusted, the pulse width of the second level interval of pulse 3 is increased (or decreased) by a preset pulse width S, then pulse 2 is adjusted, the pulse width of the second level interval of pulse 2 is increased (or decreased) by a preset pulse width S, then pulse 4 is adjusted, the pulse width of the second level interval of pulse 4 is increased (or decreased) by a preset pulse width S, and then the adjustment sequence of pulse 3, pulse 2, and pulse 4 is continued to circulate until each pulse period makes the duty cycle of the PWM signal the target duty cycle. Correspondingly, in the second dimming stage, the second sequence is pulse 1, pulse 3, pulse 2, and pulse 4, that is, in the second dimming stage, pulse 1 is first adjusted, the pulse width of the second level interval of pulse 1 is increased (or decreased) by a preset pulse width S, then pulse 3 is adjusted, and so on.

[0086] For example, as shown in FIG. 3, Figure 9 , Figure 9 For a 4-pulse scenario, the number of brightness changes in a frame of display time when each pulse period is adjusted in a disorderly manner by the preset dimming method of the present disclosure is shown in FIG. 4. Figure 9 As can be seen from FIG. 4, in the 4-pulse scenario, the number of brightness changes in a frame caused by the inconsistent pulse widths when the pulses are adjusted in a disorderly manner is 0, 2, and 4, which is compared with Figure 7 As shown in FIG. 3, PWM dimming mode 2 can increase the frequency of brightness changes in some operation steps, that is, increase the flicker frequency, so that the human eye is less likely to perceive flicker. It should be noted that, in order to compare and display, the initial conditions of each pulse period in the embodiments shown in FIGS. 5 and 6 are set to be the same (that is, the pulse width of the low level interval is B, and the adjustment step is S), and only the adjustment sequence Figure 7 is different. Figure 9 is sequential adjustment, Figure 7 is disorderly adjustment. Figure 7 Figure 9 For example, as shown in FIG. 3,

[0087] For example, as shown in FIG. 3, Figure 10 and Figure 11 , Figure 10 is a schematic diagram of a display panel with a 60Hz frame frequency and a 480Hz PWM dimming frequency when the preset dimming method is used for dimming, Figure 11 is a schematic diagram of the number of brightness changes in a frame of display time when each pulse period is adjusted in a disorderly manner by the preset dimming method of the present disclosure in an 8-pulse scenario. As shown in FIG. 6, in the 8-pulse scenario, the number of brightness changes in a frame caused by the inconsistent pulse widths when the pulses are adjusted in a disorderly manner is 0, 2, 4, 6, 8, 10, 12, and 14.​Figure 10 As shown in this embodiment, the PWM signal corresponding to one frame of image includes 8 pulse cycles, denoted as pulse 1, pulse 2, ..., pulse 8. The first sequence corresponding to the first dimming stage is: pulse 5, pulse 3, pulse 7, pulse 2, pulse 6, pulse 4, pulse 8; the second sequence is: pulse 1, pulse 5, pulse 3, pulse 7, pulse 2, pulse 6, pulse 4, pulse 8. Figure 10 The medium grayscale fill and dashed arrows are used to clearly show the adjustment sequence of each pulse cycle and have no other meaning. When the pulse cycle is represented as Ti, the first sequence is: T5, T3, T7, T2, T6, T4, T8, and the second sequence is: T1, T5, T3, T7, T2, T6, T4, T8, where Ti represents the i-th pulse cycle, and the value of i is greater than or equal to 1 and less than or equal to 8. Figure 11 As shown, in an 8-pulse scene, the number of brightness changes within a frame caused by inconsistent pulse widths during pulse scrambling adjustment is 0, 2, 4, 6, and 8, respectively. This is compared to... Figure 8 The PWM dimming method 2 shown can increase the frequency of brightness changes in some operation steps, thus increasing the flicker frequency and making the flicker less noticeable to the human eye. It should be noted that, in order to... Figure 8 To conduct a comparative display, Figure 10 and Figure 8 In the illustrated embodiment, the same initial conditions are set for each pulse period (i.e., the pulse width in the low-level interval is B, and the adjustment step is S), only the adjustment sequence is different. Figure 7 For sequential adjustment, Figure 9 (Different in order to disrupt the adjustment)

[0088] For example, please refer to Figures 12 to 18 , Figures 12 to 18 This is a schematic diagram illustrating the dimming process of a display panel with a 60Hz frame rate and a 1440Hz PWM dimming frequency using a preset dimming method. Figure 12 The preset dimming method includes a first dimming stage and a second dimming stage. The first dimming stage includes n first dimming units (i.e., operation stages 1 to n), and the second dimming stage includes i second dimming units (i.e., operation stages n+1 to n+i). Since... Figure 12 The data volume is large; for clear display, [the following will be used]. Figure 12 The display is divided into blocks, where D1 represents the dimming process corresponding to operation stage 1 in the first dimming stage. See the attached image for details. Figure 13 D2 represents the dimming process corresponding to operation stage 2 in the first dimming stage. See details... Figure 14 Dn represents the dimming process corresponding to operation stage n in the first dimming stage. See details... Figure 15 D(n+1) represents the dimming process corresponding to operation stage (n+1) in the second dimming stage. See the attached diagram for details.Figure 16 D(n+2) represents the dimming process corresponding to operation stage (n+2) in the second dimming stage. See details... Figure 17 D(n+i) represents the dimming process corresponding to operation stage (n+i) in the second dimming stage. See the attached diagram for details. Figure 18 .like Figures 12 to 18 As shown in this embodiment, the PWM signal corresponding to one frame of image includes 24 pulse cycles, denoted as pulse 1, pulse 2, ..., pulse 24. The first sequence is: pulse 13, pulse 7, pulse 19, pulse 4, pulse 16, pulse 10, pulse 22, pulse 2, pulse 14, pulse 8, pulse 20, pulse 5, pulse 17, pulse 11, pulse 23, pulse 3, pulse 15, pulse 9, pulse 21, pulse 6, pulse 18, pulse 12, pulse 24. The second sequence is: pulse 1, pulse 13, pulse 7, pulse 19, pulse 4, pulse 16, pulse 10, pulse 22, pulse 2, pulse 14, pulse 8, pulse 20, pulse 5, pulse 17, pulse 11, pulse 23, pulse 3, pulse 15, pulse 9, pulse 21, pulse 6, pulse 18, pulse 12, pulse 24. When the pulse period is represented by Ti, the first sequence is: T13, T7, T19, T4, T16, T10, T22, T2, T14, T8, T20, T5, T17, T11, T23, T3, T15, T9, T21, T6, T18, T12, T24, and the second sequence is: T1, T13, T7, T19, T4, T16, T10, T22, T2, T14, T8, T20, T5, T17, T11, T23, T3, T15, T9, T21, T6, T18, T12, T24, where Ti represents the i-th pulse period, and the value of i is greater than or equal to 1 and less than or equal to 24. Similarly, in a 24-pulse scenario, pulse scrambling adjustment will also increase the frequency of brightness changes in some operation steps, increase the flicker frequency, and reduce the flickering sensation.

[0089] It is understood that in the preset dimming method disclosed herein, each pulse cycle is shuffled and adjusted. The first and second orders during the shuffling and adjustment can also be other embodiments. As long as the order is not adjusted in the time dimension, they are all within the protection scope of this invention.

[0090] Based on the same inventive concept, this disclosure also provides a display driving device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the brightness adjustment method as described above.

[0091] For example, the display driver device is a display driver chip.

[0092] Based on the same inventive concept, the present disclosure further provides a computer readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the steps of the display driving method. In a specific implementation process, the computer readable storage medium can include a universal serial bus flash drive (USB), a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various storage media that can store program codes.

[0093] Based on the same inventive concept, the present disclosure further provides a computer program product, which includes a computer program, and the computer program is executed by a processor to implement the steps of the display driving method. Since the principle of the computer program to solve the problem is similar to that of the display driving method, the implementation of the computer program can refer to the implementation of the display driving method, and the repeated parts will not be described herein.

[0094] The computer program product can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium may, for example, but is not limited to, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device or apparatus, or any combination thereof. More specific examples (non-exhaustive list) of the readable storage medium include an electrical connection having one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0095] Obviously, the above embodiments of the present disclosure are only examples for clearly illustrating the present disclosure, and are not intended to limit the implementation manners of the present disclosure. Based on the above description, other different forms of changes or modifications can be made by those skilled in the art, and it is impossible to enumerate all the implementation manners here. Any obvious changes or modifications derived from the technical solutions of the present disclosure are still within the protection scope of the present disclosure.

Claims

1. A brightness adjustment method suitable for a display panel, characterized in that, Includes the following steps: When adjusting the display brightness of the display panel in response to a display brightness adjustment command, the target display brightness corresponding to the display brightness adjustment command is obtained; The duty cycle of the pulse width modulation signal is determined as the target duty cycle based on the target display brightness. The pulse width modulation signal includes a first number of pulse cycles, each pulse cycle includes a first level interval and a second level interval. The duty cycle represents the ratio of a first time to a second time. The first time represents the sum of the pulse widths corresponding to the first level interval or the second level interval of each pulse cycle within the second time. The second time represents the display time of one frame of image. The pulse width of the second level interval in each pulse period of the pulse width modulation signal is adjusted by a preset dimming method until the duty cycle of the pulse width modulation signal is the target duty cycle. The first number of pulse periods includes a first pulse period, and the pulse periods other than the first pulse period are second pulse periods. The initial pulse width corresponding to the second level interval in the first pulse period is the first pulse width, and the initial pulse width corresponding to the second level interval in the second pulse period is the second pulse width. The second pulse width is less than the first pulse width. The preset dimming method includes a first dimming stage and a second dimming stage. The first dimming stage is configured to sequentially adjust the pulse width of the second level interval in each second pulse period with a preset pulse width as the step size. When the pulse width corresponding to the second level interval in each second pulse period is the first pulse width, the second dimming stage is entered. The second dimming stage is configured to sequentially adjust the pulse width of the first pulse period and the pulse width of the second level interval in each second pulse period with the preset pulse width as the step size.

2. The brightness adjustment method according to claim 1, characterized in that, The relationship between the first pulse width and the second pulse width satisfies: B1 = B2 + nS, where B1 represents the first pulse width, B2 represents the second pulse width, S represents the preset pulse width, and n is a positive integer.

3. The brightness adjustment method according to claim 2, characterized in that, The first level range is a high level range, the second level range is a low level range, the first pulse width is equal to the pixel data writing time corresponding to the display panel, and the preset pulse width is the minimum pulse width adjustment unit of the display panel.

4. The brightness adjustment method according to claim 1, characterized in that, The first dimming stage is configured to adjust the pulse width of the second level interval in each second pulse cycle in a first order with a preset pulse width as the step size. The second dimming stage is configured to adjust the pulse width of the first pulse cycle and the second level interval in each second pulse cycle in a second order with the preset pulse width as the step size. In the second order, the adjustment priority of the first pulse cycle is higher than the adjustment priority of the second pulse cycle, and the adjustment order of each second pulse cycle is the first order.

5. The brightness adjustment method according to claim 4, characterized in that, The first pulse period is the first pulse period in the first number of pulse periods, and the first order satisfies the following: when the pulse width of the second level interval in each second pulse period is adjusted in the first order, the adjustment order of each second pulse period is distributed in a dispersed manner in the time dimension of the first number of pulse periods.

6. The brightness adjustment method according to claim 4 or 5, characterized in that, When the first quantity is 8, the pulse width modulation signal includes 8 pulse periods Ti. The first order in which each second pulse period is adjusted in the first dimming stage is: T5, T3, T7, T2, T6, T4, T8. The second order in which the first pulse period and each second pulse period are adjusted in the second dimming stage is: T1, T5, T3, T7, T2, T6, T4, T8. Where Ti represents the i-th pulse period, and the value of i is greater than or equal to 1 and less than or equal to 8.

7. The brightness adjustment method according to claim 4 or 5, characterized in that, When the first quantity is 24, the pulse width modulation signal includes 24 pulse periods Ti. The first sequence for adjusting each second pulse period in the first dimming stage is: T13, T7, T19, T4, T16, T10, T22, T2, T14, T8, T20, T5, T17, T11, T23, T3, T15, T9, T21, T6, T18, T12, T24. The second sequence for adjusting the first pulse period and each second pulse period in the second dimming stage is: T1, T13, T7, T19, T4, T16, T10, T22, T2, T14, T8, T20, T5, T17, T11, T23, T3, T15, T9, T21, T6, T18, T12, T24, where Ti represents the i-th pulse period, and the value of i is greater than or equal to 1 and less than or equal to 24.

8. The brightness adjustment method according to claim 4, characterized in that, The first dimming stage includes multiple first dimming units. Each first dimming unit is configured to adjust the pulse width of the second level interval of each second pulse cycle in a first order with a preset pulse width as the step size. When the first dimming unit ends, the pulse width of the second level interval of each second pulse cycle is the same and the change amount is a preset pulse width. The second dimming stage includes multiple second dimming units. Each second dimming unit is configured to adjust the pulse width of the second level interval of the first pulse period and each second pulse period in a second order with a preset pulse width as the step size. When the second dimming unit ends, the pulse width of the second level interval of the first pulse period and each second pulse period is the same and the change amount is a preset pulse width.

9. A display driving device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the brightness adjustment method as described in any one of claims 1-8.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the brightness adjustment method as described in any one of claims 1-8.

11. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps of the brightness adjustment method as described in any one of claims 1-8.

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