WO2018133182A1 - Luminance adjusting method for led display screen system - Google Patents

Luminance adjusting method for led display screen system Download PDF

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Publication number
WO2018133182A1
WO2018133182A1 PCT/CN2017/076091 CN2017076091W WO2018133182A1 WO 2018133182 A1 WO2018133182 A1 WO 2018133182A1 CN 2017076091 W CN2017076091 W CN 2017076091W WO 2018133182 A1 WO2018133182 A1 WO 2018133182A1
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Prior art keywords
brightness
led display
duty ratio
pwm
display screen
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PCT/CN2017/076091
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French (fr)
Chinese (zh)
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谢源
姚成忠
贾其忠
李敏
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深圳市金研微科技有限公司
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Publication of WO2018133182A1 publication Critical patent/WO2018133182A1/en

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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness

Definitions

  • the invention belongs to the field of optoelectronic technology, and particularly relates to a brightness adjustment method of an LED display system, which is suitable for brightness adjustment of an LED display screen of a handheld device and various terminal devices.
  • the present invention has been achieved by the following technical solutions.
  • the LED display system comprising an input signal terminal for adjusting brightness, a PWM controller and a PWM signal generator, and an LED power driver for generating a backlight current of the LED lamp;
  • the LED display system is used to adjust the brightness of the LED display, including the following steps:
  • step S1 further includes presetting the correspondence between the duty ratio of the PWM controller and the physical brightness of the LED display screen, specifically, the maximum value of the physical brightness of the display screen is corresponding to the duty ratio of 100%. , the minimum value of the physical brightness of the display screen is corresponding to the duty ratio of 0%.
  • the corresponding relationship between physical brightness and duty ratio is calculated by piecewise fitting.
  • the PWM controller is a 13-bit PWM controller; the input signal terminal includes a mechanical button module, and a software adjustment button module based on the I2C or UART communication interface implementation system.
  • the technical scheme of the invention is a micro-control adjustment technology of the brightness of the LED light, which can adjust the brightness of the display screen to a very low level, so that the LED display screen can clearly see the screen content in a dark environment without disturbing the human eye vision. At the same time, it has almost no irritating damage to the human eye; it is mainly used on equipment equipped with LED display screen, and the human eye can recognize the content on the LED display screen in an extremely dark and extremely bright environment.
  • FIG. 1 is a block diagram showing the structure of an LED display screen system in an embodiment of the present invention.
  • FIG. 2 is a flow chart of adjusting brightness of an LED display system in an embodiment of the present invention.
  • 3 is a linear relationship diagram of physical brightness and PWM duty value in an embodiment of the present invention.
  • FIG. 4 is a flow chart showing the software processing of the LED display screen system in the embodiment of the present invention.
  • the brightness adjustment method of this embodiment is based on an LED display screen of a display terminal.
  • the LED display system includes a PWM controller, a PWM generator, an LED power driver and a mechanical button as an input of the adjustment signal.
  • the mechanical button can also be replaced by a software adjustment button under the system via an I2C or UART communication interface.
  • the PWM controller adopts a PWM controller with up to 13 bits and has a programmable function.
  • the code of the software part will be burned into the ROM of the controller.
  • the PWM generator calculates the corresponding PWM signal group LED power driver through the PWM controller according to the law.
  • the power driver adjusts the backlight current of the LED lamp according to the PWM signal corresponding to the duty ratio, thereby increasing or decreasing the brightness, and the high BIT of the PWM greatly improves the precision of the duty ratio, achieving high-resolution brightness adjustment. range.
  • the point-to-space ratio is the ratio of the energization time in one pulse cycle of the PWM.
  • the brightness adjustment process mainly includes the following steps S1, S2, S3 and S4;
  • the output pulse wave of the PWM controller is a digital output, that is, its amplitude is only high level "1" and low level "0. "If you want to generate a pulse with a period of T, you can use the microcontroller programming instructions to control the output of its output "1", and maintain a period of Tp, and then output the bottom level of "0", also keep it for a while Tr completes a pulse wave of period T, and the PWM pulse wave is capable of adjusting the duty ratio.
  • the duty ratio refers to the ratio of the positive half cycle pulse width to the whole cycle, that is, the high level hold time is the ratio of the period Tp/T*100%, and T is the pulse period.
  • the ratio is a percentage, so when the period is constant, the adjustment is performed.
  • the duty cycle is the time to adjust the high level;
  • the pulse wave uses the timer interrupt to determine the period of the pulse wave, and is sent to the interrupt by mechanical button auto-increment and self-decrease, and passes the current duty cycle according to the current duty cycle.
  • the variable allocates the time occupied by the high and low levels to form different duty ratios.
  • the duty ratio is adjusted from 0% to 100%, which corresponds to the backlight of the LED power driver output. Pressurization, the duty ratio is 0%, the output backlight voltage is 0, and the duty ratio is 100%.
  • the corresponding backlight voltage is the maximum working voltage or current of the LED backlight circuit, which corresponds to the display screen being the darkest and The brightest degree;
  • the maximum value of the physical brightness of the display screen is corresponding to the duty ratio of 100%
  • the minimum value of the physical brightness of the display screen is corresponding to the duty ratio of 0%
  • the physical brightness and the duty ratio are calculated by the piecewise fitting method.
  • the correspondence between the physical brightness and the PWM duty value is generally considered to be a simple linear relationship, as shown in FIG.
  • the PWM duty ratio of the output is to be realized by setting the PWM period register and the PWM comparison register.
  • PWM duty cycle PWM compare register / PWM period register.
  • the comparison judgment of the adjustment signal is implemented by software in the PWM. Referring to FIG. 3, the software processing flow mainly includes the following steps:
  • step S201 Obtain an instruction for setting brightness of the input signal end, determine whether it is a short button for increasing brightness, if yes, go to step S202, otherwise go to step S211;
  • step S202 Obtain whether the duty ratio of the current output is less than 100%, if yes, proceed to step S203, otherwise, keep the duty ratio unchanged;
  • S203 Increase the duty ratio of the current output by 1% to increase the physical brightness of the LED display.
  • step S211 Obtain an instruction for setting brightness on the input signal end, and determine whether it is a long button for increasing brightness. If yes, go to step S212, otherwise go to step S221;
  • step S221. Obtain a command for setting brightness of the input signal end, and determine whether it is a short press to reduce the brightness. If yes, go to step S222, otherwise go to step S231;
  • the input button of the adjustment signal can be a mechanical button or a touch button.
  • the default output signal of the button is generally a high level.
  • a negative pulse adjustment signal is output to the PWM controller, according to the negative pulse low level.
  • the time can also be divided into short button and long button, and then the generated pulse signal is transmitted to the PWM controller.
  • the PWM controller judges and sets the duty ratio through software, and then controls the PWM generator to generate A PWM signal corresponding to the pulse width is supplied to the LED power driver.
  • the brightness of the backlight LED of the display screen is adjusted by the LED power driver; the LED power driver is used to generate the current required by the LED lamp, and the magnitude of the current directly affects the brightness of the LED lamp, and the circuit portion thereof is a general-purpose LED lamp backlight circuit. It is mainly composed of PWM input terminal, enable terminal, Boost switch output terminal, inductor, diode, LED power output terminal and feedback terminal of LED lamp.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)

Abstract

A luminance adjusting method for an LED display screen system. The LED display screen system comprises an input signal end for adjusting luminance, a PWM controller, a PWM signal generator, and an LED power source driver for generating backlight current of an LED lamp. The method adjusts the luminance of an LED display screen based on the LED display screen system, and comprises the following steps: S1, obtaining a correspondence between the duty ratio of the PWM controller and the physical luminance of the LED display screen; S2, obtaining an adjusting signal of the input signal end and the current duty ratio, and comparing, determining, and setting the duty ratio outputted by the PWM controller according to the adjusting signal; S3, generating a PWM signal of the corresponding physical luminance of the LED display screen by the PWM signal generator according to the duty ratio. High-precision luminance adjustment is achieved, the luminance of the LED display screen can be adjusted to be extremely low, and the human eyes can recognize content on the LED display screen in extremely dark and extremely bright environments.

Description

一种LED显示屏***的亮度调节方法Brightness adjustment method of LED display system 技术领域Technical field
本发明属于光电技术领域，具体是涉及一种LED显示屏***的亮度调节方法，适用于对手持式设备和各种终端设备的LED显示屏的亮度调节。The invention belongs to the field of optoelectronic technology, and particularly relates to a brightness adjustment method of an LED display system, which is suitable for brightness adjustment of an LED display screen of a handheld device and various terminal devices.
背景技术Background technique
当前对于手持式设备和各种终端设备，如手机，平板电脑，笔记本电脑等，在夜晚黑暗环境下，其屏幕亮度即使调到最低也非常刺眼，这种黑暗环境下的高对比度的屏幕光线对人眼会造成极大的刺激和伤害，同时会影响到周边人员。然而，由于在技术上的繁杂难度，和极高的开发成本，目前并未有相对应的技术措施来解决该问题Currently, for handheld devices and various terminal devices, such as mobile phones, tablets, laptops, etc., in the dark environment at night, the brightness of the screen is very glaring even if it is adjusted to a minimum, and the high contrast screen light in this dark environment The human eye can cause great irritation and damage, and it will affect the surrounding people. However, due to the technical difficulties and high development costs, there is no corresponding technical measure to solve this problem.
目前市场上，尤其在移动设备上，在亮度调节上只有几阶到十几阶(阶：从最暗到最亮需要调节的次数，如通过按键)，且无法实现更低亮度的调节。其实这种能够将屏幕亮度调到极限低的需求非常之多，但因其技术复杂性导致没有好的实现方案。比如有的手机阅读器推出夜晚模式，只是通过调整阅读器本身的背景颜色来降低对人眼的刺激，只有在此阅读环境下看起来比较柔和，但离开阅读器依旧变得刺眼，并没有从根本上解决问题。Currently, on the market, especially on mobile devices, there are only a few to ten steps in brightness adjustment (order: the number of adjustments from the darkest to the brightest, such as by pressing a button), and the adjustment of lower brightness cannot be achieved. In fact, there is a great need to adjust the brightness of the screen to a low limit, but there is no good implementation due to its technical complexity. For example, some mobile phone readers introduce night mode, but by adjusting the background color of the reader itself to reduce the stimulation of the human eye, only in this reading environment looks softer, but leaving the reader is still glaring, and there is no Solve the problem fundamentally.
对一般的黑暗环境尚且有诸多需求，在特定的环境如太空的夜晚、地下无光环境、封闭的无光环境等，这种需求就更加突出，在比较黑暗的环境里如果亮度达到15nits以上，人眼近距离观看更是无法承受这种光线的刺激。There are still many needs for the general dark environment. In certain environments, such as the night of space, the underground dull environment, and the closed dull environment, this demand is more prominent. In the darker environment, if the brightness reaches 15 nits or more, The human eye can't bear the stimulation of this light when watching it at close range.
在此需求背景下，我们率先进入该领域的研究与开发，指在实现极低亮 度的显示技术，该技术可以大规模应用到从消费类的手机、平板电脑、笔记本电脑、台式机等到行业应用的电子飞行终端、车载电脑、深井作业终端等等各类含有显示屏幕的产品，解决目前行业内的空白难题，并实现极高的产业价值。In the context of this demand, we are the first to enter the field of research and development, referring to the realization of extremely low brightness Degree of display technology, the technology can be applied to a wide range of products from consumer mobile phones, tablets, laptops, desktops, etc. to industrial applications such as electronic flight terminals, on-board computers, deep well operation terminals, and other products that contain display screens. Solve the current blank problems in the industry and achieve extremely high industrial value.
发明内容Summary of the invention
基于现在技术的问题，我们提出了一种LED显示屏***的亮度调节方法，实现高精度亮度调节，可以将LED显示屏亮度调到极低，在极暗和极亮的环境下人眼可以识别LED显示屏上的内容。Based on the problems of the current technology, we propose a brightness adjustment method for the LED display system, which realizes high-precision brightness adjustment, which can adjust the brightness of the LED display to a very low level, and can be recognized by the human eye in an extremely dark and extremely bright environment. The content on the LED display.
本发明是通过以下的技术方案来实现的。The present invention has been achieved by the following technical solutions.
提供一种LED显示屏***的亮度调节方法，LED显示屏***包括有调节亮度的输入信号端，PWM控制器和PWM信号发生器，以及用以产生LED灯的背光电流的LED电源驱动器；该方法基于LED显示屏***实现对LED显示屏亮度进行调节，包括如下步骤：Providing a brightness adjustment method for an LED display system, the LED display system comprising an input signal terminal for adjusting brightness, a PWM controller and a PWM signal generator, and an LED power driver for generating a backlight current of the LED lamp; The LED display system is used to adjust the brightness of the LED display, including the following steps:
S1、获取PWM控制器的占空比与LED显示屏物理亮度的对应关系；S1, obtaining a correspondence between a duty ratio of the PWM controller and a physical brightness of the LED display;
S2、获取输入信号端的调节信号和当前的占空比，根据调节信号比较判断并设置PWM控制器输出的占空比；S2, obtaining an adjustment signal of the input signal end and a current duty ratio, and judging and setting a duty ratio of the PWM controller output according to the adjustment signal;
S3、根据占空比由PWM信号发生器生成对应的LED显示屏物理亮度的PWM信号；S3, generating a PWM signal corresponding to the physical brightness of the LED display screen by the PWM signal generator according to the duty ratio;
S4、根据PWM信号由LED电源驱动器调节显示屏背光LED灯的亮度。S4. Adjusting the brightness of the backlight LED of the display screen by the LED power driver according to the PWM signal.
进一步的，所述S1步骤还包括预先进行设置PWM控制器的占空比与LED显示屏物理亮度的对应关系，具体而言是，将显示屏的物理亮度的最大值对应为占空比100％，将显示屏的物理亮度的最小值对应为占空比0％，采 用分段拟合方式计算出物理亮度与占空比的对应关系。Further, the step S1 further includes presetting the correspondence between the duty ratio of the PWM controller and the physical brightness of the LED display screen, specifically, the maximum value of the physical brightness of the display screen is corresponding to the duty ratio of 100%. , the minimum value of the physical brightness of the display screen is corresponding to the duty ratio of 0%. The corresponding relationship between physical brightness and duty ratio is calculated by piecewise fitting.
进一步的，所述S2步骤中设置PWM控制器输出的占空比是通过PWM周期寄存器和PWM比较寄存器实现，具体是PWM占空比＝PWM比较寄存器值/PWM周期寄存器值，其中PWM周期寄存器值为固定值，设置PWM比较寄存器值以达到设置PWM控制器输出的占空比；Further, setting the duty ratio of the PWM controller output in the step S2 is implemented by using a PWM period register and a PWM comparison register, specifically, a PWM duty ratio=PWM comparison register value/PWM period register value, wherein the PWM period register value is For a fixed value, set the PWM compare register value to set the duty cycle of the PWM controller output;
进一步的，所述的PWM控制器为分辨率13bit的PWM控制器；所述输入信号端包括机械按键模块，以及基于I2C或UART通讯接口实现***下的软件调节按键模块Further, the PWM controller is a 13-bit PWM controller; the input signal terminal includes a mechanical button module, and a software adjustment button module based on the I2C or UART communication interface implementation system.
本发明的技术方案是LED灯光亮度的微控调节技术，可以将显示屏亮度亮度调节到极低，使LED显示屏在黑暗环境中，依然可以清晰看到屏幕内容，不会干扰到人眼视觉，同时对人眼几乎没有刺激伤害；主要用于配备LED显示屏的设备上，在极暗和极亮的环境下人眼可以识别LED显示屏上的内容。The technical scheme of the invention is a micro-control adjustment technology of the brightness of the LED light, which can adjust the brightness of the display screen to a very low level, so that the LED display screen can clearly see the screen content in a dark environment without disturbing the human eye vision. At the same time, it has almost no irritating damage to the human eye; it is mainly used on equipment equipped with LED display screen, and the human eye can recognize the content on the LED display screen in an extremely dark and extremely bright environment.
附图说明DRAWINGS
图1是本发明实施例中的LED显示屏***的结构框图。1 is a block diagram showing the structure of an LED display screen system in an embodiment of the present invention.
图2是本发明实施例中的LED显示屏***调节亮度的流程图。2 is a flow chart of adjusting brightness of an LED display system in an embodiment of the present invention.
图3是本发明实施例中的物理亮度与PWM占空比值线性关系图。3 is a linear relationship diagram of physical brightness and PWM duty value in an embodiment of the present invention.
图4是本发明实施例中的LED显示屏***的软件处理流程图。4 is a flow chart showing the software processing of the LED display screen system in the embodiment of the present invention.
具体实施方式detailed description
以下结合附图与具体实施方式对本发明的技术方案做进一步详细说明，以使本领域的技术人员能清楚完整的理解本发明的技术内容。The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can clearly understand the technical contents of the present invention.
参照图1所示，本实施例的亮度调节方法是基于显示终端的LED显示屏 ***，LED显示屏***包括有PWM控制器、PWM发生器，LED电源驱动器以及作为调节信号的输入端的机械按键，机械按键也可通过I2C或者UART通讯接口实现***下的软件调节按钮进行替代。Referring to FIG. 1, the brightness adjustment method of this embodiment is based on an LED display screen of a display terminal. The system, the LED display system includes a PWM controller, a PWM generator, an LED power driver and a mechanical button as an input of the adjustment signal. The mechanical button can also be replaced by a software adjustment button under the system via an I2C or UART communication interface.
PWM控制器采用高达13bit的PWM控制器，具有可编程功能，将软件部分的代码将烧录到控制器的ROM里，PWM发生器通过PWM控制器依法算出对应的PWM信号组LED电源驱动器，LED电源驱动器根据组出对应占空比的PWM信号来调节LED灯的背光电流，从而实现亮度的增加或减小，并PWM的高BIT使占空比的精度大大提高，实现高分辨率的亮度调节范围。点空比是指PWM的一个脉冲循环周期内通电时间所占的比例。The PWM controller adopts a PWM controller with up to 13 bits and has a programmable function. The code of the software part will be burned into the ROM of the controller. The PWM generator calculates the corresponding PWM signal group LED power driver through the PWM controller according to the law. The power driver adjusts the backlight current of the LED lamp according to the PWM signal corresponding to the duty ratio, thereby increasing or decreasing the brightness, and the high BIT of the PWM greatly improves the precision of the duty ratio, achieving high-resolution brightness adjustment. range. The point-to-space ratio is the ratio of the energization time in one pulse cycle of the PWM.
参照图2所示，亮度调节过程主要包括如下步骤S1、S2、S3和S4；Referring to FIG. 2, the brightness adjustment process mainly includes the following steps S1, S2, S3 and S4;
S1、获取PWM控制器的占空比与LED显示屏物理亮度的对应关系；S1, obtaining a correspondence between a duty ratio of the PWM controller and a physical brightness of the LED display;
首先要预先进行设置PWM控制器的占空比与LED显示屏物理亮度的对应关系，PWM控制器的输出脉冲波为数字输出，就是其幅值只有高电平“1”和低电平“0”之分，若要生成周期为T的脉冲，就可以利用单片机编程指令控制其输出端输出“1”，并且保持一段时间Tp，然后再输出底电平“0”，同样使其保持一段时间Tr完成一个周期T的脉冲波，而PWM脉冲波是能够调节占空比。占空比是指正半周脉宽占整个周期的比例，即高电平保持时间于周期的比值Tp/T*100％，T为脉冲周期，该比值为百分数，因此在周期一定的情况下，调节占空比就是调节高电平保持的时间；Firstly, the correspondence between the duty ratio of the PWM controller and the physical brightness of the LED display should be set in advance. The output pulse wave of the PWM controller is a digital output, that is, its amplitude is only high level "1" and low level "0. "If you want to generate a pulse with a period of T, you can use the microcontroller programming instructions to control the output of its output "1", and maintain a period of Tp, and then output the bottom level of "0", also keep it for a while Tr completes a pulse wave of period T, and the PWM pulse wave is capable of adjusting the duty ratio. The duty ratio refers to the ratio of the positive half cycle pulse width to the whole cycle, that is, the high level hold time is the ratio of the period Tp/T*100%, and T is the pulse period. The ratio is a percentage, so when the period is constant, the adjustment is performed. The duty cycle is the time to adjust the high level;
开始前设定一个初始PWM占空比，脉冲波是利用单片机定时中断去确定脉冲波的周期，并且通过机械按键自增和自减某个变量送至中断中，根据当前的占空比通过此变量去分配高低电平各自占用的时间，以形成不同的占空比，占空比调节范围在0％-100％，将其对应于LED电源驱动器输出的背光电 压，占空比为0％对应输出的背光电压为0，占空比为100％对应输出的背光电压即是LED灯背光电路最大的工作电压或者电流，分别对应的就是显示屏就是最暗和最亮的程度；Before starting, set an initial PWM duty cycle. The pulse wave uses the timer interrupt to determine the period of the pulse wave, and is sent to the interrupt by mechanical button auto-increment and self-decrease, and passes the current duty cycle according to the current duty cycle. The variable allocates the time occupied by the high and low levels to form different duty ratios. The duty ratio is adjusted from 0% to 100%, which corresponds to the backlight of the LED power driver output. Pressurization, the duty ratio is 0%, the output backlight voltage is 0, and the duty ratio is 100%. The corresponding backlight voltage is the maximum working voltage or current of the LED backlight circuit, which corresponds to the display screen being the darkest and The brightest degree;
具体是将显示屏的物理亮度的最大值对应为占空比100％，将显示屏的物理亮度的最小值对应为占空比0％，采用分段拟合方式计算出物理亮度与占空比的对应关系，一般认为物理亮度与PWM占空比值为简单的线性关系，参照图3中所示。Specifically, the maximum value of the physical brightness of the display screen is corresponding to the duty ratio of 100%, and the minimum value of the physical brightness of the display screen is corresponding to the duty ratio of 0%, and the physical brightness and the duty ratio are calculated by the piecewise fitting method. The correspondence between the physical brightness and the PWM duty value is generally considered to be a simple linear relationship, as shown in FIG.
S2、获取输入信号端的调节信号和当前的占空比，根据调节信号比较判断并设置PWM控制器输出的占空比；输出的PWM占空比，是要通过设置PWM周期寄存器和PWM比较寄存器实现，PWM占空比＝PWM比较寄存器/PWM周期寄存器。对于调节信号的比较判定是通过PWM内的软件实现，参照图3所示，软件处理流程主要包括步骤如下：S2, obtaining the adjustment signal of the input signal end and the current duty ratio, and judging and setting the duty ratio of the PWM controller output according to the adjustment signal; the PWM duty ratio of the output is to be realized by setting the PWM period register and the PWM comparison register. , PWM duty cycle = PWM compare register / PWM period register. The comparison judgment of the adjustment signal is implemented by software in the PWM. Referring to FIG. 3, the software processing flow mainly includes the following steps:
S201、获取输入信号端的设置亮度的指令，判断是否为增加亮度的短按键，是则进入S202步骤，否则进入S211步骤；S201: Obtain an instruction for setting brightness of the input signal end, determine whether it is a short button for increasing brightness, if yes, go to step S202, otherwise go to step S211;
S202、获取当前输出的占空比是否小于100％，是则进入S203步骤，否则保持占空比不变；S202. Obtain whether the duty ratio of the current output is less than 100%, if yes, proceed to step S203, otherwise, keep the duty ratio unchanged;
S203、将当前输出的占空比增加1％，达到增加LED显示屏物理亮度。S203: Increase the duty ratio of the current output by 1% to increase the physical brightness of the LED display.
S211、获取输入信号端的设置亮度的指令，判断是否为增加亮度的长按键，是则进入S212步骤，否则进入S221步骤；；S211. Obtain an instruction for setting brightness on the input signal end, and determine whether it is a long button for increasing brightness. If yes, go to step S212, otherwise go to step S221;
S212、获取当前输出的占空比是否小于95％，是则进入S213步骤，否则保持占空比不变；S212. Obtaining whether the duty ratio of the current output is less than 95%, if yes, proceeding to step S213, otherwise maintaining the duty ratio unchanged;
S213、将当前输出的占空比增加5％，达到增加LED显示屏物理亮度。S213, increasing the duty ratio of the current output by 5% to increase the physical brightness of the LED display.
S221、获取输入信号端的设置亮度的指令，判断是否为降低亮度的短按 键，是则进入S222步骤，否则进入S231步骤；；S221. Obtain a command for setting brightness of the input signal end, and determine whether it is a short press to reduce the brightness. If yes, go to step S222, otherwise go to step S231;
S222、获取当前输出的占空比是否大于0％，是则进入S223步骤，否则保持占空比不变；S222. Obtaining whether the duty ratio of the current output is greater than 0%, if yes, proceeding to step S223, otherwise maintaining the duty ratio unchanged;
S223、将当前输出的占空比降低1％，达到降低LED显示屏物理亮度。S223, reducing the duty ratio of the current output by 1% to reduce the physical brightness of the LED display.
S231、获取输入信号端的设置亮度的指令，判断是否为降低亮度的长按键，是则进入S232步骤；S231. Obtain an instruction for setting brightness of the input signal end, determine whether it is a long button for reducing brightness, and if yes, proceed to step S232;
S232、获取当前输出的占空比是否大于5％，是则进入S233步骤，否则进入S234步骤，否则将当前输出的占空比设置为0％；S232: Obtaining whether the duty ratio of the current output is greater than 5%, if yes, proceeding to step S233, otherwise, proceeding to step S234, otherwise setting the duty ratio of the current output to 0%;
S233、将当前输出的占空比降低5％，达到降低LED显示屏物理亮度。S233, reducing the duty ratio of the current output by 5% to reduce the physical brightness of the LED display.
S3、根据占空比由PWM信号发生器生成对应的LED显示屏物理亮度的PWM信号；S3, generating a PWM signal corresponding to the physical brightness of the LED display screen by the PWM signal generator according to the duty ratio;
调节信号的输入端按键可以是机械按键也可以是触控按键，按键的默认输出信号一般为高电平，每触发一次按键便输出一个负脉冲调节信号给PWM控制器，根据负脉冲低电平的时间还可以分为短按键和长按键两种，然后产生的脉冲信号传送给PWM控制器，PWM控制器在接收一个脉冲信号后便通过软件判断及设置占空比，再控制PWM发生器产生一个对应脉宽的PWM信号给LED电源驱动器。The input button of the adjustment signal can be a mechanical button or a touch button. The default output signal of the button is generally a high level. Each time a button is triggered, a negative pulse adjustment signal is output to the PWM controller, according to the negative pulse low level. The time can also be divided into short button and long button, and then the generated pulse signal is transmitted to the PWM controller. After receiving a pulse signal, the PWM controller judges and sets the duty ratio through software, and then controls the PWM generator to generate A PWM signal corresponding to the pulse width is supplied to the LED power driver.
S4、根据PWM信号由LED电源驱动器调节显示屏背光LED灯的亮度；LED电源驱动器用于产生LED灯需要的电流，电流的大小直接影响LED灯的亮度，其电路部分为通用的LED灯背光电路，主要由PWM输入端，使能端，Boost switch输出端，电感，二极管，LED电源输出端以及LED灯的反馈端等组成。S4, according to the PWM signal, the brightness of the backlight LED of the display screen is adjusted by the LED power driver; the LED power driver is used to generate the current required by the LED lamp, and the magnitude of the current directly affects the brightness of the LED lamp, and the circuit portion thereof is a general-purpose LED lamp backlight circuit. It is mainly composed of PWM input terminal, enable terminal, Boost switch output terminal, inductor, diode, LED power output terminal and feedback terminal of LED lamp.
以上，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局限 于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求书的保护范围为准。 The above is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited. It is to be understood that those skilled in the art are susceptible to variations and substitutions within the scope of the present invention. Therefore, the scope of the invention should be determined by the scope of the claims.

Claims (8)

  1. 一种LED显示屏***的亮度调节方法，其特征在于，LED显示屏***包括有调节亮度的输入信号端，PWM控制器和PWM信号发生器，以及用以产生LED灯的背光电流的LED电源驱动器；该方法基于LED显示屏***实现对LED显示屏亮度进行调节，包括如下步骤：A method for adjusting brightness of an LED display system, characterized in that the LED display system comprises an input signal terminal for adjusting brightness, a PWM controller and a PWM signal generator, and an LED power driver for generating backlight current of the LED lamp. The method is based on the LED display system to adjust the brightness of the LED display, including the following steps:
    S1、获取PWM控制器的占空比与LED显示屏物理亮度的对应关系；S1, obtaining a correspondence between a duty ratio of the PWM controller and a physical brightness of the LED display;
    S2、获取输入信号端的调节信号和当前的占空比，根据调节信号比较判断并设置PWM控制器输出的占空比；S2, obtaining an adjustment signal of the input signal end and a current duty ratio, and judging and setting a duty ratio of the PWM controller output according to the adjustment signal;
    S3、根据占空比由PWM信号发生器生成对应的LED显示屏物理亮度的PWM信号；S3, generating a PWM signal corresponding to the physical brightness of the LED display screen by the PWM signal generator according to the duty ratio;
    S4、根据PWM信号由LED电源驱动器调节显示屏背光LED灯的亮度。S4. Adjusting the brightness of the backlight LED of the display screen by the LED power driver according to the PWM signal.
  2. 根据权利要求1所述的LED显示屏***的亮度调节方法，其特征在于，所述S1步骤还包括预先进行设置PWM控制器的占空比与LED显示屏物理亮度的对应关系，具体而言是，将显示屏的物理亮度的最大值对应为占空比100％，将显示屏的物理亮度的最小值对应为占空比0％，采用分段拟合方式计算出物理亮度与占空比的对应关系。The brightness adjustment method of the LED display screen system according to claim 1, wherein the step S1 further comprises setting a correspondence between a duty ratio of the PWM controller and a physical brightness of the LED display screen in advance, specifically The maximum value of the physical brightness of the display screen is corresponding to the duty ratio of 100%, and the minimum value of the physical brightness of the display screen is corresponding to the duty ratio of 0%, and the physical brightness and the duty ratio are calculated by the piecewise fitting method. Correspondence relationship.
  3. 根据权利要求或1或2所述的LED显示屏***的亮度调节方法，其特征在于，所述S2步骤中设置PWM控制器输出的占空比是通过PWM周期寄存器和PWM比较寄存器实现，具体是PWM占空比＝PWM比较寄存器值/PWM周期寄存器值，其中PWM周期寄存器值为固定值，设置PWM比较寄存器值以达到设置PWM控制器输出的占空比。The brightness adjustment method of the LED display system according to claim 1 or 2, wherein the duty ratio of the PWM controller output in the step S2 is implemented by a PWM period register and a PWM comparison register, specifically PWM duty cycle = PWM compare register value / PWM period register value, where the PWM period register value is a fixed value, set the PWM compare register value to achieve the duty cycle of setting the PWM controller output.
  4. 根据权利要求或1或2所述的LED显示屏***的亮度调节方法，其特征在于，所述S2步骤中具体包括以下步骤；The brightness adjustment method of the LED display screen system according to claim 1 or 2, wherein the step S2 specifically comprises the following steps;
    S201、获取输入信号端的设置亮度的指令，判断是否为增加亮度的短按 键，是则进入S202步骤；S201. Obtain an instruction for setting brightness of the input signal end, and determine whether it is a short press for increasing brightness. Key, then go to step S202;
    S202、获取当前输出的占空比是否小于100％，是则进入S203步骤；S202. Obtain whether the duty ratio of the current output is less than 100%, and then proceed to step S203.
    S203、将当前输出的占空比增加1％，达到增加LED显示屏物理亮度。S203: Increase the duty ratio of the current output by 1% to increase the physical brightness of the LED display.
  5. 根据权利要求或1或2所述的LED显示屏***的亮度调节方法，其特征在于，所述S2步骤中具体包括以下步骤；The brightness adjustment method of the LED display screen system according to claim 1 or 2, wherein the step S2 specifically comprises the following steps;
    S211、获取输入信号端的设置亮度的指令，判断是否为增加亮度的长按键，是则进入S212步骤；S211: Obtain an instruction for setting brightness of the input signal end, determine whether it is a long button for increasing brightness, and if yes, proceed to step S212;
    S212、获取当前输出的占空比是否小于95％，是则进入S213步骤；S212. Obtain a duty ratio of the current output that is less than 95%. If yes, go to step S213.
    S213、将当前输出的占空比增加5％，达到增加LED显示屏物理亮度。S213, increasing the duty ratio of the current output by 5% to increase the physical brightness of the LED display.
  6. 根据权利要求或1或2所述的LED显示屏***的亮度调节方法，其特征在于，所述S2步骤中具体包括以下步骤；The brightness adjustment method of the LED display screen system according to claim 1 or 2, wherein the step S2 specifically comprises the following steps;
    S221、获取输入信号端的设置亮度的指令，判断是否为降低亮度的短按键，是则进入S222步骤；S221: Obtain a command for setting brightness of the input signal end, determine whether it is a short button for reducing brightness, and if yes, proceed to step S222;
    S222、获取当前输出的占空比是否大于0％，是则进入S223步骤；S222. Obtain whether the duty ratio of the current output is greater than 0%, and then proceed to step S223.
    S223、将当前输出的占空比降低1％，达到降低LED显示屏物理亮度。S223, reducing the duty ratio of the current output by 1% to reduce the physical brightness of the LED display.
  7. 根据权利要求或1或2所述的LED显示屏***的亮度调节方法，其特征在于，所述S2步骤中具体包括以下步骤；The brightness adjustment method of the LED display screen system according to claim 1 or 2, wherein the step S2 specifically comprises the following steps;
    S231、获取输入信号端的设置亮度的指令，判断是否为降低亮度的长按键，是则进入S232步骤；S231. Obtain an instruction for setting brightness of the input signal end, determine whether it is a long button for reducing brightness, and if yes, proceed to step S232;
    S232、获取当前输出的占空比是否大于5％，是则进入S233步骤，否则进入S234步骤；S232. Obtain whether the duty ratio of the current output is greater than 5%. If yes, go to step S233, otherwise go to step S234.
    S233、将当前输出的占空比降低5％，达到降低LED显示屏物理亮度。S233, reducing the duty ratio of the current output by 5% to reduce the physical brightness of the LED display.
    S234、将当前输出的占空设置为0％。 S234. Set the duty of the current output to 0%.
  8. 根据权利要求或1或2所述的LED显示屏***的亮度调节方法，其特征在于，所述的PWM控制器为分辨率13bit的PWM控制器；所述输入信号端包括机械按键模块，以及基于I2C或UART通讯接口实现***下的软件调节按键模块。 The brightness adjustment method of the LED display screen system according to claim 1 or 2, wherein the PWM controller is a 13-bit PWM controller; the input signal terminal includes a mechanical button module, and is based on The I2C or UART communication interface implements the software adjustment button module under the system.
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