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WO2018133182A1 - Procédé de réglage de luminance pour système d'écran d'affichage à del - Google Patents

Procédé de réglage de luminance pour système d'écran d'affichage à del 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
Authority
WO
WIPO (PCT)
Prior art keywords
brightness
led display
duty ratio
pwm
display screen
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2017/076091
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English (en)
Chinese (zh)
Inventor
谢源
姚成忠
贾其忠
李敏
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GOLDENTREK TECHNOLOGY Co Ltd
Original Assignee
GOLDENTREK TECHNOLOGY Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GOLDENTREK TECHNOLOGY Co Ltd filed Critical GOLDENTREK TECHNOLOGY Co Ltd
Publication of WO2018133182A1 publication Critical patent/WO2018133182A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

L'invention concerne un procédé de réglage de luminance pour un système d'écran d'affichage à DEL. Le système d'écran d'affichage à DEL comprend une extrémité de signal d'entrée pour régler la luminance, un contrôleur de modulation de largeur d'impulsions (MLI), un générateur de signal MLI, et un pilote de source d'alimentation électrique à DEL pour générer un courant de rétroéclairage d'une source lumineuse à DEL. Le procédé règle la luminance d'un écran d'affichage à DEL sur la base du système d'écran d'affichage à DEL, et comprend les étapes suivantes consistant à: S1, obtenir une correspondance entre le rapport cyclique du contrôleur MLI et la luminance physique de l'écran d'affichage à DEL; S2, obtenir un signal de réglage de l'extrémité de signal d'entrée et du rapport cyclique courant, et comparer, déterminer et ajuster le rapport cyclique délivré par le contrôleur MLI en fonction du signal de réglage; S3, générer un signal MLI de la luminance physique correspondante de l'écran d'affichage à DEL par le générateur de signal MLI selon le rapport cyclique. On obtient ainsi un réglage de luminance de haute précision, la luminance de l'écran d'affichage à DEL peut être réglée de façon à être extrêmement faible, et les yeux humains peuvent reconnaître un contenu sur l'écran d'affichage à DEL dans des environnements extrêmement sombres et extrêmement brillants.
PCT/CN2017/076091 2017-01-18 2017-03-09 Procédé de réglage de luminance pour système d'écran d'affichage à del Ceased WO2018133182A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201710033425.6A CN106782298A (zh) 2017-01-18 2017-01-18 一种led显示屏系统的亮度调节方法
CN201710033425.6 2017-01-18

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WO2018133182A1 true WO2018133182A1 (fr) 2018-07-26

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Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10565928B2 (en) * 2018-04-04 2020-02-18 Sct Ltd. Method and apparatus for compensating image data for LED display
CN110895916A (zh) * 2018-09-20 2020-03-20 研祥智能科技股份有限公司 自适应设置lvds接口输出分辨率的系统
CN110992901B (zh) * 2019-12-24 2022-04-12 太原航空仪表有限公司 一种背光亮度控制算法
TWI745038B (zh) * 2020-08-20 2021-11-01 瑞鼎科技股份有限公司 非等差的脈寬調變調光方法
CN112669764B (zh) * 2020-12-25 2021-09-14 深圳市金研微科技有限公司 一种显示器亮度均匀型调节方法
CN112667188A (zh) * 2020-12-28 2021-04-16 长沙湘计海盾科技有限公司 一种显示器亮度控制方法，装置，系统，电子终端及可读存储介质
CN113936612A (zh) * 2021-11-01 2022-01-14 中航华东光电有限公司 基于标定的亮度值设置液晶屏背光亮度的装置和方法
CN114220386B (zh) * 2021-11-25 2023-07-25 武汉海微科技有限公司 符合人眼视觉特征的MiniLed显示屏亮度调节方法
CN114464144B (zh) * 2022-01-28 2023-06-20 昆山龙腾光电股份有限公司 一种亮度调节显示方法、亮度调节显示系统及液晶显示装置
CN115482793A (zh) * 2022-10-08 2022-12-16 广东夏野日用电器有限公司 通过主动亮度调节促进视焦调节的显示装置和电子设备
CN115484703B (zh) * 2022-10-31 2024-07-02 歌尔股份有限公司 遥控器背光控制方法、装置、遥控器及介质

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CN101770751A (zh) * 2008-12-30 2010-07-07 京东方科技集团股份有限公司 液晶显示器背光模组亮度调节系统及方法
CN102088500A (zh) * 2009-12-02 2011-06-08 希姆通信息技术（上海）有限公司 一种根据手机屏幕内容动态控制背光的方法
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CN101188099A (zh) * 2007-11-19 2008-05-28 南京Lg新港显示有限公司 Lcd显示器脉宽调制调光方式
CN101770751A (zh) * 2008-12-30 2010-07-07 京东方科技集团股份有限公司 液晶显示器背光模组亮度调节系统及方法
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