WO2020119240A1 - 一种背光亮度调节方法及液晶显示设备 - Google Patents

一种背光亮度调节方法及液晶显示设备 Download PDF

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Publication number
WO2020119240A1
WO2020119240A1 PCT/CN2019/111264 CN2019111264W WO2020119240A1 WO 2020119240 A1 WO2020119240 A1 WO 2020119240A1 CN 2019111264 W CN2019111264 W CN 2019111264W WO 2020119240 A1 WO2020119240 A1 WO 2020119240A1
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Prior art keywords
backlight brightness
backlight
adjustment
value corresponding
target
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PCT/CN2019/111264
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English (en)
French (fr)
Inventor
卢平光
薛广华
张在京
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海信视像科技股份有限公司
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Publication of WO2020119240A1 publication Critical patent/WO2020119240A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources

Definitions

  • the present application relates to the field of electronic technology, in particular to a backlight brightness adjustment method and a display device.
  • backlight is often used to provide a module for screen brightness.
  • the backlight is irradiated from the side or the back to increase the illumination in a low light source environment, and is widely used in electronic equipment such as television equipment and computer equipment.
  • the basic principle of backlight brightness adjustment is to adjust the power supply voltage of the backlight module by Pulse Width Modulation (PWM) signal, and to achieve the brightness adjustment of the backlight by increasing and decreasing the voltage.
  • PWM Pulse Width Modulation
  • the user adjusts the backlight brightness by changing the corresponding brightness value of the user interface (User Interface, UI), which actually corresponds to the proportional PWM value.
  • UI User Interface
  • the corresponding relationship between the backlight brightness corresponding value and the PWM value is determined by the system software of the TV device according to the display image quality. Decide.
  • An embodiment of the present application provides a backlight brightness adjustment method, which includes: an LCD screen receives a backlight brightness adjustment command of a remote controller; a number axis of backlight brightness adjustment is displayed on the LCD screen; and a number axis of backlight brightness on the LCD screen indicates a value corresponding to the current backlight brightness.
  • the value moves to the value corresponding to the target backlight brightness; when the difference between the target backlight brightness value and the current backlight brightness value is 1, the backlight brightness of the LCD screen changes in a gradual manner.
  • a liquid crystal display device including: a processor and a memory; the memory is used to store computer instructions; the processor is used to run the computer instructions to implement: the LCD screen receives The backlight brightness adjustment command of the remote control; the number axis of the backlight brightness adjustment displayed on the LCD screen; the number axis of the backlight brightness on the LCD screen indicates moving from the value corresponding to the current backlight brightness to the value corresponding to the target backlight brightness; When the difference between the values of the initial backlight brightness is 1, the backlight brightness of the LCD screen changes in a gradual manner.
  • a liquid crystal screen receives a backlight brightness adjustment instruction of a remote controller; a liquid crystal screen
  • the number axis of the backlight brightness adjustment is displayed on the LCD; the number axis of the backlight brightness on the LCD screen indicates moving from the value corresponding to the current backlight brightness to the value corresponding to the target backlight brightness; the difference between the value corresponding to the target backlight brightness and the value corresponding to the initial current backlight brightness When it is 1, the backlight brightness of the LCD screen changes in a gradual manner.
  • FIG. 1 is a schematic structural diagram of a system architecture to which an embodiment of this application is applicable;
  • FIG. 2 is a schematic diagram of a display backlight brightness adjustment interface of a smart TV in an embodiment of the present application
  • 3A is a flowchart of a backlight brightness adjustment method provided by an embodiment of the present application.
  • 3B is a flowchart of another backlight brightness adjustment method provided by an embodiment of the present application.
  • FIG. 4 is a time distribution diagram of backlight brightness adjustment within the polling time of the main thread of backlight brightness adjustment in the embodiment of the present application;
  • FIG. 5 is a schematic structural diagram of a backlight brightness adjustment device according to an embodiment of the present application.
  • FIG. 6 is a schematic structural diagram of a liquid crystal display device provided by an embodiment of the present application.
  • the backlight brightness number axis appears on the display screen to indicate the corresponding value of the backlight brightness, which is generally set before leaving the factory; in a possible implementation, the corresponding value of the backlight brightness is 1 ⁇ 100. In another possible implementation manner, the corresponding value of the backlight brightness is 1-30.
  • the corresponding relationship between the corresponding value of the backlight brightness and the PWM value is divided into two types.
  • the backlight brightness adjustment range is large, for example, the corresponding value of the backlight brightness is 1-100, and the corresponding PWM value is a voltage duty ratio of 0%-100% In this case, it takes a long time to complete the adjustment of the backlight brightness from the brightest to the darkest, and the brightness of the backlight brightness between the corresponding values of the adjacent backlight brightness does not change significantly, which affects the user experience; the other is the backlight brightness adjustment
  • the range is small, for example, the corresponding value of the backlight brightness is 1-30, and the corresponding PWM value is the voltage duty ratio of 0%-100%.
  • the backlight brightness between the corresponding values of the backlight brightness changes significantly, and the completion It takes less time to adjust the brightness of the backlight from the brightest to the darkest, but it will cause a strong sense of flicker for each change in the backlight brightness and affect the user experience.
  • FIG. 1 it is a schematic structural diagram of a system architecture to which an embodiment of the present application is applicable.
  • the system architecture 100 includes a display device 101 and a remote controller 102.
  • the remote controller 102 may send a control instruction to the display device 101 in a wireless manner.
  • the display device 101 is configured with a backlight module.
  • the display device 101 may be a television (such as a smart TV) or other display devices configured with a backlight module.
  • the remote controller 102 is a wireless transmission device, and the user can realize human-computer interaction with the display device 101 by operating the remote controller 102.
  • the remote controller 102 encodes the user's key information through digital encoding technology, and emits light waves through an infrared diode. The light waves pass through the infrared receiver of the display device 101 to convert the received infrared signals into electrical signals Then, the processor decodes, demodulates the corresponding instruction and executes the instruction to achieve the purpose of controlling the display device 101 to complete the required operation.
  • the system architecture 100 may further include a set-top box (not shown in the figure) connected to the smart TV.
  • the set-top box is also called digital video conversion box, which is used to convert the compressed digital signal into TV content and display it on the display device.
  • the set-top box can be built into the smart TV or can be externally connected to the smart TV.
  • the control command issued by the remote control is received and decoded by the set-top box, and the set-top box sends the decoded control command to the smart TV.
  • the remote controller may also include other mobile user equipment.
  • the mobile user equipment may establish a wireless communication connection with the display device, and send a control instruction to the display device through the wireless communication connection.
  • the mobile user equipment may be a smart phone, a tablet computer, a personal digital assistant (Personal Digital Assistant, PDA), a smart wearable device, or the like.
  • PDA Personal Digital Assistant
  • the operating system carried by the display device 101 may be an Android system, a Windows system, or a system built by a device provider.
  • the present application does not specifically limit the type of operating system carried on the display device 101.
  • the user can perform human-computer interaction with the display device 101 through the remote controller 102 to adjust the backlight brightness in the interface of the display device 101.
  • the display device 101 is configured with a backlight module.
  • the backlight module provides backlight illumination for the display device 101.
  • the user can send a backlight brightness adjustment command through a remote control to adjust the backlight brightness of the backlight module.
  • FIG. 2 is a schematic diagram of a display backlight brightness adjustment interface of a smart TV in an embodiment of the present application.
  • the user enters the backlight brightness adjustment interface through the remote control.
  • the smart TV display interface 200 displays the backlight brightness adjustment interface 201
  • the backlight brightness adjustment interface 201 displays the backlight brightness adjustment number axis 202 and the backlight brightness corresponding value 203.
  • the digital axis 202 for backlight brightness adjustment is equipped with a circular adjustment button to indicate the corresponding value of the backlight brightness.
  • the digital axis 202 for backlight brightness adjustment The adjustment knob moves to the right or left, and the target backlight brightness corresponding value is displayed at the backlight brightness corresponding value 203 (for example, the value may be a value between 1 and 30).
  • the backlight brightness adjustment main thread in the backlight module obtains the backlight brightness adjustment instruction sent from the remote controller 102, determines the target backlight brightness corresponding value of the backlight brightness adjustment instruction and the target backlight brightness corresponding PWM value, and adjusts the PWM to change the backlight mode Set the power supply voltage to adjust the brightness of the backlight of the display device 101.
  • the display device 101 has different image quality on the screen due to different signal sources (such as ultra-clear image quality, SD image quality, smooth image quality, etc.), so the same backlight brightness corresponds to different PWM values.
  • the corresponding value of the backlight brightness as 1 to 30, and the PWM value according to the digital component equalization as 0 to 255 as an example
  • the corresponding value of the backlight brightness as 15 corresponds to the PWM value 70
  • the corresponding value of the backlight brightness is 15 and the corresponding PWM value is 190
  • the backlight module determines that the corresponding value of the backlight brightness is 15 corresponding to the PWM value
  • the corresponding value of the backlight brightness Perform linear average calculation for the corresponding PWM values in the two ranges of 1-15 and 15-30, and determine and store the PWM value corresponding to the corresponding value of each backlight brightness.
  • the PWM value corresponding to the corresponding value of the same backlight brightness may be different, that is, the difference between the PWM values corresponding to the values of the two adjacent backlight brightness may be small or large.
  • the backlight brightness adjustment instruction is executed once, and there is obvious backlight brightness flicker, which affects the user experience.
  • the LCD screen receives the backlight brightness adjustment command of the remote controller; the number axis of the backlight brightness adjustment is displayed on the LCD screen; the number axis of the backlight brightness adjustment on the LCD screen indicates the corresponding value from the current backlight brightness The value moves to the value corresponding to the target backlight brightness; when the difference between the value corresponding to the target backlight brightness and the value corresponding to the current backlight brightness exceeds a preset value, the backlight brightness of the LCD screen changes in a gradual manner. Furthermore, the obvious backlight flicker during the backlight brightness adjustment process can be reduced, and the user experience can be improved.
  • FIG. 3A is a flowchart of a backlight brightness adjustment method provided by an embodiment of the present application. As shown in the figure, the method includes:
  • S301a The LCD screen receives the backlight brightness adjustment command of the remote control
  • S302a Display the number axis of backlight brightness adjustment on the LCD screen
  • S302a The number axis of the backlight brightness adjustment on the LCD screen indicates to move from the value corresponding to the current backlight brightness to the value corresponding to the target backlight brightness;
  • FIG. 3B is a flowchart of another backlight brightness adjustment method provided by an embodiment of the present application. As shown, the method includes:
  • S301b Obtain the remote controller instruction, and determine the corresponding value of the target backlight brightness according to the remote controller instruction.
  • the user enters the backlight brightness adjustment interface of the smart TV by operating the keys of the remote control.
  • the user operates the keys of the remote control again to send a remote control command to the smart TV, such as
  • the user presses the increase and decrease keys on the remote control to adjust the backlight brightness.
  • the number axis of the backlight brightness adjustment in the backlight brightness adjustment interface displays the corresponding value of the target backlight brightness.
  • S302b Determine the difference between the current backlight brightness value and the target backlight brightness value according to the difference between the PWM values corresponding to the current backlight brightness value and the target backlight brightness value and the preset number of backlight adjustments Steps for single backlight adjustment.
  • the PWM value represents the size of the duty cycle of the PWM signal.
  • the PWM signal is used to control the power supply voltage of the backlight module, that is, by adjusting the size of the PWM signal duty cycle, the size of the power supply voltage of the backlight module is controlled to change the brightness of the backlight. adjust.
  • P 1 represents the PWM value corresponding to the current backlight brightness corresponding value
  • P 2 represents the PWM value corresponding to the target backlight brightness corresponding value
  • represents the value between the current backlight brightness corresponding value and the target backlight brightness corresponding value PWM difference
  • N 0 means preset backlight adjustment times
  • y means single backlight adjustment step, corresponding to PWM digital quantization sampling point, Means round up.
  • the PWM value corresponding to the corresponding value of the current backlight brightness and the corresponding value of the target backlight brightness is determined according to the corresponding value of the target backlight brightness, and the two are subtracted to obtain the corresponding PWM difference between the corresponding value of the target backlight brightness and the corresponding value of the current backlight brightness.
  • the PWM difference is divided by the preset number of backlight adjustments, rounded to obtain a single backlight adjustment step that adjusts the current backlight brightness corresponding value to the target backlight brightness corresponding value, which is the current backlight brightness corresponding value and the target backlight brightness PWM value for single backlight adjustment between corresponding values.
  • the preset number of backlight adjustments is determined by the processing delay of the remote controller instructions (the delay is jointly determined by the relevant system operations such as the decoding time of the key signal on the remote controller, the time of function call, etc.) and adjusting the power supply voltage of the backlight module once The minimum delay supported is determined together.
  • the processing delay of the remote control command is 50 milliseconds, and the minimum delay supported by adjusting the power supply voltage of the backlight module is 3 milliseconds, then the processing delay of the remote control command can be 16 times (that is, rounded up after 50/3) )
  • Sub-backlight module power supply voltage adjustment that is, the maximum number of adjustments of the backlight module power supply voltage within the processing delay of the remote controller command is 16 times, considering the robustness, the preset backlight adjustment times can be set to 10 times .
  • S303b Adjust the power supply voltage of the backlight module according to the difference between the pulse width modulation PWM value corresponding to the current backlight brightness corresponding value and the target backlight brightness corresponding value, and the step size of single backlight adjustment.
  • the number of backlight adjustments is determined according to the difference between the pulse width modulation PWM value corresponding to the current backlight brightness corresponding value and the target backlight brightness corresponding value and the step size of single backlight adjustment according to formula (2) ;
  • P represents the difference between the current backlight brightness corresponding value and the target backlight brightness corresponding value respectively corresponding to the PWM value
  • y represents a single backlight adjustment step
  • N represents the backlight adjustment times
  • Means round up After determining the step size of the single backlight adjustment, according to the step size y of the single backlight adjustment, the single backlight adjustment is performed N times in a row, and N is less than or equal to the preset number of backlight adjustments.
  • the above formula for obtaining the number of times of backlight adjustment may use rounding up or down, or other rounding methods, which are not limited in this application.
  • the difference between the PWM value corresponding to the current backlight brightness corresponding value and the target backlight brightness corresponding value is 35
  • the preset number of backlight brightness adjustments is 10
  • it is determined according to step S302 that the current backlight brightness corresponds to The value is adjusted to the target backlight brightness corresponding to the value to perform a single backlight adjustment step of 4, then the backlight brightness adjustment main thread within a polling time (remote control response time) 10 steps of 4
  • the backlight brightness is adjusted so that the current backlight brightness gradually changes to the target backlight brightness, thereby reducing the flickering feeling during the backlight brightness change and improving the user experience.
  • the preset backlight adjustment times are 10, and the PWM difference is 5, then the rounding step to obtain a single backlight adjustment is 1, and the PWM difference is divided by the single backlight adjustment step to obtain a backlight adjustment number of 5 At this time, the backlight brightness adjustment main thread only needs to perform the backlight brightness adjustment with a step size of 1 for 5 consecutive times.
  • the backlight brightness adjustment main thread may determine the corresponding value of the target backlight brightness after the consecutive multiple remote control instructions are executed according to the buffered consecutive multiple remote control instructions.
  • the corresponding value of the current backlight brightness is 1, the polling time of the backlight brightness adjustment main thread to perform a backlight brightness detection is 200 milliseconds, the processing delay of the remote control command is 50 milliseconds, and the user long presses the add button on the remote control to execute
  • the backlight brightness corresponds to the value increasing operation, and the corresponding value of the backlight brightness displayed on the user interface increases from 1 to 5, which means that four remote controller commands are sent within 200 milliseconds.
  • the backlight brightness adjustment main thread first obtains the remote controller instruction corresponding to the backlight brightness value of 2, determines the target backlight brightness corresponding value to 2, and performs the corresponding backlight brightness adjustment; after the adjustment is completed, the backlight brightness adjustment main thread determines the remaining 3 remote controllers
  • the latest remote control instruction obtained in the instruction is the corresponding value of the target backlight brightness, that is, the corresponding value of the target backlight brightness is determined to be 5, and then the corresponding backlight brightness adjustment is performed.
  • the backlight brightness adjustment operation of the smart TV is usually performed by the corresponding function module in the operating system, specifically, it can be performed by the backlight brightness adjustment main thread.
  • the smart TV After receiving the remote control command, the smart TV will cache it in the command queue.
  • the main thread of backlight brightness adjustment can obtain the remote control command from the command queue according to the set period (such as every 200 milliseconds) and respond to the obtained remote control command .
  • the main thread for adjusting the backlight brightness obtains the remote controller instruction from the instruction queue, the corresponding value of the target backlight brightness is determined according to the remote controller instruction.
  • a temporary thread for backlight brightness adjustment is created, and the temporary thread is parallel to the main thread, and the temporary thread is mainly used to implement gradual adjustment of backlight brightness.
  • the backlight brightness adjustment main thread sends the determined current backlight brightness corresponding value and the target backlight brightness corresponding value to the temporary thread, or the backlight brightness adjustment main thread sends the determined current backlight brightness corresponding value and the target backlight brightness corresponding value respectively
  • the PWM value is sent to the temporary thread.
  • the temporary thread After the temporary thread receives the 2 PWM values, it first calls the related function to calculate the difference between the current PWM value and the target PWM; the temporary thread then calls the related function according to the preset number of backlight adjustments to calculate the step size of the single backlight adjustment ; Finally, the temporary thread sets the step size to the power supply voltage of the backlight module through the hardware drive function according to the calculated difference between the current PWM value and the target PWM value and the step size of the single backlight adjustment to achieve the backlight brightness adjust.
  • the temporary thread after the temporary thread completes the backlight brightness adjustment, the temporary thread is destroyed on its own, so that no additional resources are required, and the backlight brightness adjustment main thread does not need to block and wait to realize the parallel work of the two threads.
  • the minimum delay supported by adjusting the power supply voltage of a backlight module is 3 milliseconds, and the preset number of backlight adjustments is 10 as an example, and the process of temporarily adjusting the brightness of the backlight will be specifically described.
  • FIG. 4 it is a time distribution diagram of backlight brightness adjustment within the polling time of the main thread of backlight brightness adjustment in the embodiment of the present application.
  • temporary threads for backlight brightness adjustment are created at 15 milliseconds and 110 milliseconds, respectively, that is, the user adjusts the backlight brightness twice within 200 milliseconds.
  • a temporary thread for backlight brightness adjustment is created according to the received remote controller instruction; during the 15th to 25th milliseconds, the temporary thread receives the current backlight brightness corresponding value sent by the main thread for backlight brightness adjustment and the target backlight brightness correspondence The PWM value corresponding to the value or the corresponding value of the current backlight brightness and the corresponding value of the target backlight brightness, and determine the PWM difference between the corresponding value of the current backlight brightness and the corresponding value of the target backlight brightness and the step length of the single backlight adjustment; During ⁇ 46 milliseconds, the temporary thread sets the determined step size of the single backlight adjustment to the power supply voltage of the backlight module through the hardware driving function.
  • This operation is repeated 7 times (determined by the PWM difference and the step size of the single backlight adjustment ); The preset waiting time for the temporary thread during the 46th to 56th milliseconds. If a remote controller instruction is received within this time, the temporary thread performs backlight brightness adjustment; otherwise, the temporary thread destroys itself.
  • the time distribution of performing backlight brightness adjustment 10 times for the temporary thread during the 110-160 millisecond period is similar to the operation performed during the 15-56 millisecond period, and will not be repeated here.
  • the polling time of the backlight brightness adjustment main thread cannot be arbitrarily reduced or increased, the PWM difference between the current backlight brightness corresponding value and the target backlight brightness corresponding value may be large during the polling time, such as the backlight brightness adjustment main thread During the polling time, it is necessary to perform an operation from the backlight brightness corresponding value of 1 to the backlight brightness corresponding value of 4, which will cause a noticeable flicker during the backlight brightness adjustment process and affect the user experience.
  • an embodiment of the present application further provides a backlight brightness adjustment device, and the device may perform the flow of the method shown in FIG. 3.
  • FIG. 5 is a schematic structural diagram of a backlight brightness adjustment device provided by an embodiment of the present application.
  • the equipment department realizes the aforementioned process of adjusting the brightness of the backlight provided by the aforementioned benefits.
  • the device includes: a target backlight brightness determination unit 501, a backlight adjustment step size determination unit 502, and an adjustment unit 503.
  • Target backlight brightness determination unit 501 Obtain a remote controller instruction, and determine a value corresponding to the target backlight brightness according to the remote controller instruction.
  • the backlight adjustment step determination unit 502 used to determine the current backlight according to the difference between the pulse width modulation PWM value corresponding to the current backlight brightness corresponding value and the target backlight brightness corresponding value, respectively, and the preset backlight adjustment times The step of single backlight adjustment between the corresponding value of brightness and the corresponding value of the target backlight brightness, wherein the PWM value represents the duty ratio of the PWM signal, and the PWM signal is used to control the power supply voltage of the backlight module.
  • Adjustment unit 503 used to adjust the power supply of the backlight module according to the difference between the pulse width modulation PWM value corresponding to the current backlight brightness corresponding value and the target backlight brightness corresponding value and the step size of the single backlight adjustment Voltage.
  • an embodiment of the present application further provides a liquid crystal display device, which can implement the process performed in FIG. 5 in the foregoing embodiment.
  • FIG. 6 shows a schematic structural diagram of a liquid crystal display device 600 provided by an embodiment of the present application, that is, another schematic structural diagram of a backlight brightness adjustment device 500.
  • the liquid crystal display device 600 includes a processor 601 and a memory 602.
  • the processor 601 may also be a controller.
  • the processor 601 is configured to support the terminal to perform the functions involved in the foregoing process.
  • the memory 602 is used for coupling with the processor 601, which stores necessary program instructions and data of the terminal.
  • the processor 601 is connected to a memory 602, where the memory 602 is used to store instructions, and the processor 601 is used to execute the instructions stored in the memory 602, so as to complete the steps of the client device performing corresponding functions in the above method.
  • the backlight brightness adjustment device 500 and the liquid crystal display device 600 refer to the foregoing method or other embodiments for explanations and detailed descriptions and other steps. The description of the content is not repeated here.
  • processors in the embodiments of the present application may be a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (application-specific integrated circuit (ASIC), field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It can implement or execute various exemplary logical blocks, modules and circuits described in conjunction with the content of the present application.
  • the processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, DSP and microprocessor combinations, and so on.
  • the memory may be integrated in the processor, or may be provided separately from the processor.
  • embodiments of the present application also provide a computer-readable storage medium.
  • the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause the computer to execute the process executed in FIG. 3.
  • These computer program instructions may also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device, the instructions
  • the device implements the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operating steps are performed on the computer or other programmable device to produce computer-implemented processing, which is executed on the computer or other programmable device
  • the instructions provide steps for implementing the functions specified in one block or multiple blocks of the flowchart one flow or multiple flows and/or block diagrams.

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Abstract

一种背光亮度调节方法、装置及显示设备（101），该方法包括：液晶屏幕接收到遥控器的背光亮度调节指令（S301a）；液晶屏幕上显示背光亮度调节的数轴（S302a）；液晶屏幕上背光亮度的数轴指示从当前背光亮度对应的数值移动到目标背光亮度对应的数值（S303a）；在目标背光亮度对应的数值与当前背光亮度对应的数值的差值为1时，液晶屏幕的背光亮度以渐变方式变化（S304a）。

Description

一种背光亮度调节方法及液晶显示设备
本申请要求于2018年12月13日提交中国专利局、申请号为201811523769.6申请名称为“一种背光亮度调节方法、装置及显示设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电子技术领域，尤其涉及一种背光亮度调节方法及显示设备。
背景技术
背光作为一种照明的形式，常被用于屏幕亮度的提供模块。背光从侧边或是背后照射用以增加低光源环境中的照明度，广泛应用于电视设备、计算机设备等电子设备中。
用户在使用电视设备时，可根据需求对背光亮度进行调节，背光亮度调节过程中的亮度闪烁程度可直接影响用户的使用体验。背光亮度调节的基本原理为通过脉冲宽度调制(Pulse Width Modulation，PWM)信号调节背光模组供电电压，通过增大减小电压的方法实现背光的亮度调节。用户通过改变用户界面(User Interface，UI)的背光亮度对应数值进行背光调节，实际是对应到等比例的PWM值，背光亮度对应数值与PWM值的对应关系由电视设备的系统软件根据显示画质决定。
发明内容
本申请实施例提供一种背光亮度调节方法，包括：液晶屏幕接收 到遥控器的背光亮度调节指令；液晶屏幕上显示背光亮度调节的数轴；液晶屏幕上背光亮度的数轴指示从当前背光亮度对应的数值移动到目标背光亮度对应的数值；在目标背光亮度对应的数值和当前背光亮度对应的数值的差值为1时，液晶屏幕的背光亮度以渐变方式变化。
本申请的另一实施例提供一种液晶显示设备，包括：处理器、存储器；所述存储器，用于存储计算机指令；所述处理器，用于运行所述计算机指令以实现：液晶屏幕接收到遥控器的背光亮度调节指令；液晶屏幕上显示背光亮度调节的数轴；液晶屏幕上背光亮度的数轴指示从当前背光亮度对应的数值移动到目标背光亮度对应的数值；在目标背光亮度对应的数值和初始背光亮度对应的数值的差值为1时，液晶屏幕的背光亮度以渐变方式变化。
本申请的另一实施例提供一种计算机可读存储介质，所述存储介质存储有计算机指令，所述计算机指令被处理器执行时实现：液晶屏幕接收到遥控器的背光亮度调节指令；液晶屏幕上显示背光亮度调节的数轴；液晶屏幕上背光亮度的数轴指示从当前背光亮度对应的数值移动到目标背光亮度对应的数值；在目标背光亮度对应的数值和初当前背光亮度对应的数值的差值为1时，液晶屏幕的背光亮度以渐变方式变化。
附图说明
图1为本申请实施例适用的系统架构的结构示意图；
图2为本申请实施例中智能电视显示背光亮度调节界面的示意图；
图3A为本申请实施例提供的一种背光亮度调节方法的流程图；
图3B为本申请实施例提供的另一种背光亮度调节方法的流程图；
图4为本申请实施例中背光亮度调节主线程轮询时间内背光亮度调节的时间分布图；
图5为本申请实施例提供的一种背光亮度调节装置的结构示意图；
图6为本申请实施例提供的液晶显示设备的结构示意图。
具体实施方式
相关技术中，液晶屏幕进行背光亮度调节时，显示屏幕上出现背光亮度数轴用于指示背光亮度的对应数值，一般出厂前设定；在一种可能的实施方式中，背光亮度的对应数值为1～100，在另一种可能的实施方式中，背光亮度的对应数值为1～30。该背光亮度对应数值与PWM值的对应关系分两种，一种是背光亮度调节范围较大，例如背光亮度对应数值为1～100，对应的PWM值为0％～100％的电压占空比，此种情况完成一次最亮到最暗的背光亮度调节需要较长的时间，且相邻背光亮度对应数值之间的背光亮度明暗变化不明显，影响用户使用体验；另一种是背光亮度调节范围较小，例如背光亮度对应数值为1～30，对应的PWM值为0％～100％的电压占空比，此种情况相邻背光亮度对应数值之间的背光亮度明暗变化明显，且完成一次最亮到最暗的背光亮度调节需的时间较短，但会造成背光亮度的每次变化闪烁感较强，影响用户使用体验。
下面结合附图对本申请实施例进行详细描述。
参见图1，为本申请实施例适用的系统架构的结构示意图。
如图1所示，系统架构100中包括显示设备101以及遥控器102。遥控器102可以通过无线方式向显示设备101发送控制指令，显示设备101配置有背光模组，该显示设备101可以是电视机(比如智能电视)也可以是其它配置有背光模组的显示设备。
遥控器102是一种无线发射装置，用户通过操作遥控器102可以实现与显示设备101的人机交互。在一种可能的应用场景中，遥控器102通过数字编码技术，将用户的按键信息进行编码，通过红外线二极管发射光波，光波经显示设备101的红外线接收器将收到的红外信号转变成电信号，然后处理器进行解码，解调出相应的指令并执行该指令，以达到控制显示设备101完成所需操作的目的。
在本申请的实施方式中，以显示设备101为智能电视为例，系统架构100中还可以包括与智能电视连接的机顶盒(未在图中示出)。机顶盒也称数字视频变换盒，用于将压缩的数字信号转成电视内容，并在显示设备上显示出来。机顶盒可以内置于智能电视，也可外接于智能电视。遥控器发出的控制指令被机顶盒接收并解码，机顶盒将解码后的控制指令发送给智能电视。
上述遥控器也可包括其他移动用户设备。该移动用户设备可与显示设备建立无线通信连接，通过该无线通信连接向显示设备发送控制指令。所述移动用户设备可以是智能手机、平板电脑、个人数字助理(Personal Digital Assistant，PDA)、智能穿戴设备等类似设备。
显示设备101所搭载的操作系统可以是安卓(Android)系统、视窗(Windows)系统或设备提供商自建系统等。本申请对于显示设备101所搭载的操作系统的类型不作具体限制。
基于上述系统架构100，本申请的实施例中，用户可以通过遥控器102与显示设备101进行人机交互，对显示设备101界面中的背光亮度进行调节操作。
显示设备101配置有背光模组，背光模组为显示设备101提供背光照明，用户可以通过遥控器发送背光亮度调节指令以调节背光模组的背光亮度。以智能电视为例，参见图2，为本申请实施例中智能 电视显示背光亮度调节界面的示意图。用户通过遥控器进入背光亮度调节界面，如图所示，智能电视显示界面200显示有背光亮度调节界面201，在背光亮度调节界面201中显示有背光亮度调节的数轴202以及背光亮度对应数值203。背光亮度调节的数轴202上配置有圆形的调节钮，用于指示背光亮度对应数值，当用户按遥控器的“增加”或“减少”按键后，作为响应，背光亮度调节的数轴202上的调节钮向右或向左移动，并在背光亮度对应数值203处显示目标背光亮度对应数值(比如该数值可以是1到30之间的某个数值)。背光模组中的背光亮度调节主线程获取从遥控器102发送的背光亮度调节指令，确定该背光亮度调节指令的目标背光亮度对应数值以及目标背光亮度对应数值对应的PWM值，调节PWM改变背光模组供电电压从而实现显示设备101背光亮度明暗的调节。
显示设备101因信号源的不同，屏幕显示的画质不一样(比如超清画质，标清画质，流畅画质等)，故相同背光亮度对应数值对应的PWM值不同。以背光亮度对应数值为1～30，PWM值按照数字量均分量化为0～255为例，对于超清画质显示设备101的屏幕显示偏亮，背光亮度对应数值为15对应的PWM值为70；对于流畅画质显示设备101的屏幕显示偏暗，背光亮度对应数值为15对应的PWM值为190；背光模组在确定背光亮度对应数值为15对应的PWM值后，对背光亮度对应数值为1～15，15～30两个区间内对应的PWM值做线性均分计算，确定每个背光亮度对应数值对应的PWM值并存储。
由于在不同情况下，相同的背光亮度对应数值对应的PWM值可能不同，即相邻两个背光亮度对应数值所对应的PWM值之间的差值有可能较小也有可能较大，在相邻两个背光亮度对应数值所对应的PWM值之间的差值较大的情况下，执行一次背光亮度调节指令，存 在明显的背光亮度闪烁，影响用户体验。
为解决上述问题，本申请提供的实施例中，液晶屏幕接收到遥控器的背光亮度调节指令；液晶屏幕上显示背光亮度调节的数轴；液晶屏幕上背光亮度调节的数轴指示从当前背光亮度对应的数值移动到目标背光亮度对应的数值；在目标背光亮度对应的数值和当前背光亮度对应的数值的差值超过预设值时，液晶屏幕的背光亮度以渐变方式变化。进而可以降低背光亮度调节过程中明显的背光闪烁，提高用户使用体验。
图3A为本申请实施例提供的一种背光亮度调节方法的流程图，如图所示，该方法包括：
S301a：液晶屏幕接收到遥控器的背光亮度调节指令；
S302a：液晶屏幕上显示背光亮度调节的数轴；
S302a：液晶屏幕上背光亮度调节的数轴指示从当前背光亮度对应的数值移动到目标背光亮度对应的数值；
S302a：在目标背光亮度对应的数值和当前背光亮度对应的数值的差值为1时，液晶屏幕的背光亮度以渐变方式变化。
图3B为本申请实施例提供的另一种背光亮度调节方法的流程图。如图所示，该方法包括：
S301b：获取遥控器指令，根据遥控器指令确定目标背光亮度对应值。
以智能电视为例，在一种可能的场景中，用户通过操作遥控器的按键进入智能电视的背光亮度调节界面，针对该界面，用户再次操作遥控器的按键向智能电视发送遥控器指令，比如用户按遥控器上的增加键和减小键，用以调节背光亮度。作为响应，背光亮度调节界面中的背光亮度调节的数轴显示目标背光亮度对应数值。
S302b：根据当前背光亮度对应数值与目标背光亮度对应数值分别对应的PWM值之间的差值以及预设的背光调节次数，确定所述当前背光亮度对应数值与所述目标背光亮度对应数值之间单次背光调节的步长。
具体地，PWM值表示PWM信号的占空比大小，PWM信号用于控制背光模组的供电电压，即通过调节PWM信号占空比的大小控制背光模组供电电压的大小变化，实现背光明暗的调节。根据当前背光亮度对应数值与目标亮度对应数值分别对应的PWM值之间的差值以及预设的背光调节次数，按照公式(1)确定当前背光亮度对应数值与目标背光亮度对应数值之间的单次背光调节的步长。
Figure PCTCN2019111264-appb-000001
其中，P 1表示当前背光亮度对应数值对应的PWM值，P 2表示目标背光亮度对应数值对应的PWM值，|P 1-P 2|表示当前背光亮度对应数值与目标背光亮度对应数值之间的PWM差值，N 0表示预设的背光调节次数，y表示单次背光调节的步长，对应PWM数字量化采样点，
Figure PCTCN2019111264-appb-000002
表示向上取整。即根据目标背光亮度对应数值确定当前背光亮度对应数值与目标背光亮度对应数值分别对应的PWM值，两者相减得到目标背光亮度对应数值与当前背光亮度对应数值之间对应的PWM差值，将PWM差值除以预设的背光调节次数，取整得到将当前背光亮度对应数值调节到目标背光亮度对应数值的单次背光调节的步长，该步长为当前背光亮度对应数值与目标背光亮度对应数值之间单次背光调节的PWM值。
其中，预设的背光调节次数由遥控器指令的处理时延(该时延由遥控器上按键信号的解码耗时，函数调用耗时等相关系统操作共同 决定)以及调节一次背光模组供电电压所支持的最小时延共同确定。比如遥控器指令的处理时延为50毫秒，调节一次背光模组供电电压所支持的最小时延为3毫秒，那么遥控器指令的处理时延内可进行16次(即50/3后取整)次背光模组供电电压的调节，即遥控器指令的处理时延内背光模组供电电压的最大调节次数为16次，考虑到健壮性，可将该预设的背光调节次数设置为10次。
S303b：根据当前背光亮度对应数值与目标背光亮度对应数值分别对应的脉冲宽度调制PWM值之间的差值以及单次背光调节的步长调节背光模组供电电压。
在本申请的实施方式中，根据当前背光亮度对应数值与目标背光亮度对应数值分别对应的脉冲宽度调制PWM值之间的差值以及单次背光调节的步长按照公式(2)确定背光调节次数；
Figure PCTCN2019111264-appb-000003
其中，P表示当前背光亮度对应数值与目标背光亮度对应数值分别对应的PWM值之间的差值，y表示单次背光调节的步长，N表示背光调节次数，
Figure PCTCN2019111264-appb-000004
表示向上取整。确定出单次背光调节的步长后，按照该单次背光调节的步长y，连续执行N次的单次背光调节，N小于或等于预设的背光调节次数。
需要说明的是，在实际应用中，上述背光调节次数的求取公式中可以采用向上取整，也可以采用向下取整，还可以采用其它取整方式，本申请对此不作限定。
示例性地，当前背光亮度对应数值与目标背光亮度对应数值分别对应的PWM值之间的差值为35，预设的背光亮度调节次数为10，根据步骤S302确定出由所述当前背光亮度对应数值调至所述目标背 光亮度对应数值执行的单次背光调节的步长为4，,则在背光亮度调节主线程的一个轮询时间内(遥控器响应时间内)进行10次步长为4的背光亮度的调节，以使当前背光亮度渐变至目标背光亮度，从而降低了背光亮度变化过程中的闪烁感，提高了用户的使用体验。再比如，预设的背光调节次数为10，PWM差值为5，那么取整得到单次背光调节的步长为1，PWM差值除以单次背光调节的步长得到背光调节次数为5次，则在背光亮度调节主线程的一个轮询时间内只需连续进行5次步长为1的背光亮度的调节。
在一种可能的情况下，指令队列中可能缓存有连续多个遥控器指令。比如，若用户连续操作遥控器或长按遥控器的增加键或减小键，会在短时间内产生连续多个遥控器指令。针对这种情况，在本申请的实施方式中，在S301中，背光亮度调节主线程可以根据缓存的连续多个遥控器指令确定该连续多个遥控器指令被执行后的目标背光亮度对应数值。比如当前背光亮度对应数值为1，背光亮度调节主线程进行一次背光亮度检测的轮询时间为200毫秒，遥控器指令的处理时延为50毫秒，用户长按200毫秒遥控器上的增加键执行背光亮度对应数值增加操作，用户界面显示的背光亮度对应数值从1增加值5，即在200毫秒内发送了4个遥控器指令。背光亮度调节主线程首先获取背光亮度对应数值为2的遥控器指令，确定目标背光亮度对应数值为2，进行相应的背光亮度调节；调节完成后，背光亮度调节主线程确定剩余的3个遥控器指令中最新获取的遥控器指令为目标背光亮度对应数值，即确定目标背光亮度对应数值为5，再进行相应的背光亮度调节。
智能电视的背光亮度调节操作通常由操作系统中的相应功能模块来执行，具体地，可由背光亮度调节主线程来执行。智能电视接 收到遥控器指令后会将其缓存到指令队列，背光亮度调节主线程可按照设定周期(比如每200毫秒)从指令队列中获取遥控器指令并对获取到的遥控器指令进行响应。在S301中，背光亮度调节主线程从指令队列中获取到该遥控器指令后，根据该遥控器指令确定目标背光亮度对应数值。
在本申请的实施方式中，在S301之后，创建背光亮度调节的临时线程，该临时线程与主线程并行，该临时线程主要用于实现背光亮度的渐变调节。具体地，背光亮度调节主线程将确定的当前背光亮度对应数值以及目标背光亮度对应数值发送给临时线程，或者背光亮度调节主线程将确定的当前背光亮度对应数值以及目标背光亮度对应数值分别对应的PWM值发送给临时线程。临时线程接收到2个PWM值之后，首先调用相关函数，计算当前PWM值与目标PWM之间的差值；临时线程再根据预设的背光调节次数调用相关函数，计算单次背光调节的步长；最后，临时线程根据计算出的当前PWM值与目标PWM值之间的差值以及单次背光调节的步长，通过硬件驱动函数将步长设置到背光模组供电电压中，实现背光亮度的调节。
在本申请的实施方式中，在临时线程完成背光亮度调节之后，该临时线程自行销毁，这样无需占用额外资源，且不需要背光亮度调节主线程阻塞等待，实现了两个线程的并行工作。
下面以调节一次背光模组供电电压所支持的最小时延为3毫秒，预设的背光调节次数为10次为例，对临时线程调节背光亮度的过程进行具体地描述。
参见图4，为本申请实施例中背光亮度调节主线程轮询时间内背光亮度调节的时间分布图。如图所示，在背光亮度调节主线程轮询时间200毫秒内，分别在第15毫秒以及第110毫秒时创建背光亮度 调节的临时线程，即用户在200毫秒内调节背光亮度2次。具体地，在第15毫秒时根据接收到的遥控器指令创建背光亮度调节临时线程；在第15～25毫秒期间，临时线程接收背光亮度调节主线程发送的当前背光亮度对应数值以及目标背光亮度对应数值或者当前背光亮度对应数值以及目标背光亮度对应数值分别对应的PWM值，并确定当前背光亮度对应数值以及目标背光亮度对应数值之间的PWM差值以及单次背光调节的步长；在第25～46毫秒期间，临时线程通过硬件驱动函数将确定出的单次背光调节的步长设置到背光模组供电电压中，该操作重复7次(由PWM差值和单次背光调节的步长确定)；在第46～56毫秒期间为临时线程预设的等待时间，若在该时间内接收到遥控器指令，则临时线程执行背光亮度调节；否则，临时线程自行销毁。第110～160毫秒期间为临时线程执行10次背光亮度调节的时间分布，与第15～56毫秒期间所执行的操作类似，在此不再赘述。
由于背光亮度调节主线程的轮询时间不能随意减少或增加，故在轮询时间内可能导致当前背光亮度对应数值与目标背光亮度对应数值之间的PWM差值较大，比如背光亮度调节主线程在轮询时间内需要执行从背光亮度对应数值为1调节到背光亮度对应数值为4的操作，这样在背光亮度调节过程中会造成明显的闪烁感，影响用户的使用体验。创建与背光亮度调节主线程并行的临时线程，在主线程轮询时间内，该临时线程按照单次背光调节步长进行多次背光亮度调节，可实现背光亮度明暗的平滑变化，对系统资源进行了合理利用的同时，减少背光亮度调节过程中的闪烁感，提高用户使用体验。
基于相同的技术构思，本申请实施例还提供了一种背光亮度调节装置，该设备可执行如图3所示方法的流程。
图5为本申请实施例提供的一种背光亮度调节装置的结构示 意图。该设备科实现前述实惠了提供的背光亮度调节的流程。
如图所示，该装置包括：目标背光亮度确定单元501，背光调节步长确定单元502，以及调节单元503。
目标背光亮度确定单元501：获取遥控器指令，根据所述遥控器指令确定目标背光亮度对应数值。
背光调节步长确定单元502：用于根据当前背光亮度对应数值与所述目标背光亮度对应数值分别对应的脉冲宽度调制PWM值之间的差值以及预设的背光调节次数，确定所述当前背光亮度对应数值与所述目标背光亮度对应数值之间单次背光调节的步长，其中，PWM值表示PWM信号的占空比大小，PWM信号用于控制背光模组的供电电压。
调节单元503：用于根据所述当前背光亮度对应数值与所述目标背光亮度对应数值分别对应的脉冲宽度调制PWM值之间的差值以及所述单次背光调节的步长调节背光模组供电电压。
基于相同的技术构思，本申请实施例还提供一种液晶显示设备，该液晶显示设备可实现前述实施例中图5所执行的流程。
图6示出了本申请实施例提供的液晶显示设备600的结构示意图，即示出了背光亮度调节装置500的另一结构示意图。参阅图6所示，该液晶显示设备600包括处理器601、存储器602。其中，处理器601也可以为控制器。所述处理器601被配置为支持终端执行前述流程涉及的功能。存储器602用于与处理器601耦合，其保存终端必要的程序指令和数据。其中，处理器601、和存储器602相连，该存储器602用于存储指令，该处理器601用于执行该存储器602存储的指令，以完成上述方法中客户端设备执行相应功能的步骤。
本申请实施例中，背光亮度调节装置500和液晶显示设备600 所涉及的与本申请实施例提供的技术方案相关的概念，解释和详细说明及其它步骤请参见前述方法或其它实施例中关于这些内容的描述，此处不做赘述。
需要说明的是，本申请实施例上述涉及的处理器可以是中央处理器(central processing unit，CPU)，通用处理器，数字信号处理器(digital signal processor，DSP)，专用集成电路(application-specific integrated circuit，ASIC)，现场可编程门阵列(field programmable gate array，FPGA)或者其它可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请内容所描述的各种示例性的逻辑方框，模块和电路。处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，DSP和微处理器的组合等等。其中，所述存储器可以集成在所述处理器中，也可以与所述处理器分开设置。
基于相同的技术构思，本申请实施例还提供了一种计算机可读存储介质。计算机可读存储介质存储有计算机可执行指令，计算机可执行指令用于使计算机执行图3中所执行的流程。
本申请是参照根据本申请实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程 数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
尽管已描述了本申请的优选实施例，但本领域内的技术人员一旦得知了基本创造性概念，则可对这些实施例作出另外的变更和修改。所以，所附权利要求意欲解释为包括优选实施例以及落入本申请范围的所有变更和修改。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (12)

  1. 一种背光亮度调节方法，包括：
    液晶屏幕接收到遥控器的背光亮度调节指令；
    液晶屏幕上显示背光亮度调节的数轴；
    液晶屏幕上背光亮度调节的数轴指示从当前背光亮度对应的数值移动到目标背光亮度对应的数值；
    在目标背光亮度对应的数值和当前背光亮度对应的数值的差值为1时，液晶屏幕的背光亮度以渐变方式变化。
  2. 根据权利要求1所述的方法，其中所述液晶屏幕的背光亮度以渐变方式变化包括：
    确定目标背光亮度对应的PWM值与当前背光亮度对应的PWM值的差值；
    将所述差值除以预设的背光亮度调节次数，向上取整获得单次背光调节的步长；
    基于所述单次背光调节的步长实现液晶屏幕背光亮度的渐变变化。
  3. 根据权利要求2所述的方法，其特征在于，所述基于所述单次背光调节的步长实现液晶屏幕背光亮度的渐变变化包括：
    将所述差值除以单次背光调节的步长，取整获得所述液晶屏幕背光亮度调节的次数N；
    按照所述单次背光调节的步长，连续执行N次的单次背光亮度调节，以实现所述液晶屏幕背光亮度的渐变变化。
  4. 根据权利要求2或3所述的方法，其特征在于，所述PWM值表示PWM信号的占空比大小，PWM信号用于控制背光模组的供电电压，所述背光亮度调节的步长对应PWM数字量化采样点数；
  5. 根据权利要求4所述的方法，所述背光亮度调节次数小于或等于所述预设的背光亮度调节次数；
  6. 如权利要求2至4任一所述的方法，其特征在于，所述预设的背光亮度调节次数是根据所述遥控器指令的处理时延内背光模组供电电压的最大调节次数确定的。
  7. 如权利要求1至5中任一项所述的方法，其特征在于，所述目标背光亮度对应的数值由背光亮度调节主线程确定；
    所述背光亮度调节主线程确定目标背光亮度对应的数值之后，还包括：创建背光亮度调节的临时线程，所述临时线程与所述主线程并行，并执行：
    确定目标背光亮度对应的PWM值与当前背光亮度对应的PWM值的差值；
    将所述差值除以预设的背光亮度调节次数，向上取整获得单次背光调节的步长；
    基于所述单次背光调节的步长实现液晶屏幕背光亮度的渐变变化。
  8. 如权利要求6所述的方法，其特征在于，所述创建背光亮度调节的临时线程之后，还包括：
    所述背光亮度调节主线程将所述当前背光亮度对应的数值与所述目标背光亮度对应的数值值发送给所述临时线程；或者，
    所述背光亮度调节主线程将所述当前背光亮度对应的PWM值与所述目标背光亮度对应的PWM值发送给所述临时线程。
  9. 如权利要求6所述的方法，其特征在于，所述基于所述单次背光调节的步长实现液晶屏幕背光亮度的渐变变化之后，还包括：
    所述临时线程自行销毁。
  10. 如权利要求1至8中任一项所述的方法，其特征在于，还包括：
    若所述遥控器背光亮度调节指令中缓存有多个连续的遥控器指令，则根据指令队列顺序依次获取所述遥控器指令，确定目标背光亮度对应的数值。
  11. 一种液晶显示设备，其特征在于，包括：处理器、存储器；
    所述存储器，用于存储计算机指令；
    所述处理器，用于运行所述计算机指令以实现如权利要求1至9中任一项所述的方法。
  12. 一种计算机可读存储介质，其特征在于，所述存储介质存储有计算机指令，所述计算机指令被处理器执行时实现权利要求1至9中任一项所述的方法。
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