WO2011009364A1 - Procédé et dispositif de commande du rétroéclairage d'un dispositif d'affichage à cristaux liquides - Google Patents

Procédé et dispositif de commande du rétroéclairage d'un dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2011009364A1
WO2011009364A1 PCT/CN2010/074464 CN2010074464W WO2011009364A1 WO 2011009364 A1 WO2011009364 A1 WO 2011009364A1 CN 2010074464 W CN2010074464 W CN 2010074464W WO 2011009364 A1 WO2011009364 A1 WO 2011009364A1
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WO
WIPO (PCT)
Prior art keywords
voltage
backlight
voltage signal
display
unit
Prior art date
Application number
PCT/CN2010/074464
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English (en)
Chinese (zh)
Inventor
周翔
张钰旻
童晓斌
Original Assignee
湖南三一智能控制设备有限公司
三一重工股份有限公司
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 湖南三一智能控制设备有限公司, 三一重工股份有限公司 filed Critical 湖南三一智能控制设备有限公司
Publication of WO2011009364A1 publication Critical patent/WO2011009364A1/fr

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Classifications

    • 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

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a backlight control method and apparatus for a liquid crystal display.
  • Industrial production automation equipment is usually equipped with displays that serve as human-machine interfaces for displaying device status and operational controls. These displays are embedded computer products.
  • the liquid crystal display is widely used as a human-machine interface because of its small size, light weight, and clearer display.
  • liquid crystal displays are different from other displays.
  • the liquid crystal molecules themselves have no luminescent properties and require a backlight module to provide the desired light source for the display panel.
  • LCD Monitor
  • the light source required for (LCD) is to drive a high-voltage cold cathode fluorescent lamp (CCFL) to project light onto the backlight to achieve image display.
  • CCFL cold cathode fluorescent lamp
  • the heat of the display is mainly emitted by the backlight. Therefore, the temperature of the display can be lowered by controlling the backlight to protect the display.
  • a method for controlling the temperature of a display provided by the prior art, wherein the temperature of the display is detected by a temperature detecting unit, and the temperature signal of the cold cathode lamp is determined by the central processor comparing the temperature signal with a preset reference temperature.
  • the temperature of the display is below or maintained at a predetermined reference temperature.
  • a disadvantage of the prior art is that it requires control by a processor, the control process is too complicated, and the cost is high.
  • Embodiments of the present invention provide a backlight control method and apparatus for a liquid crystal display, which can achieve adaptive adjustment of backlight brightness and reduce the temperature of the display.
  • Embodiments of the present invention provide a backlight control method for a liquid crystal display, including:
  • the temperature of the environment in which the display is located is obtained and converted into a voltage signal U. ;
  • the voltage signal U is used by a voltage difference ratio operation circuit. Converting to obtain a voltage signal; inputting the converted voltage signal to a backlight driving circuit, and controlling the backlight brightness of the display by using the voltage signal.
  • Embodiments of the present invention provide a backlight control apparatus for a liquid crystal display, including:
  • a temperature sensor for obtaining the temperature of the environment in which the display is located and converting the temperature into a voltage signal
  • the voltage conversion unit uses the voltage difference ratio operation circuit to the voltage signal U. Performing a conversion to output the converted voltage signal to the backlight driving circuit;
  • a backlight driving control unit controls the backlight brightness of the display by using the converted voltage signal.
  • the backlight control device further comprises:
  • An input unit configured to input backlight control information
  • a processing unit configured to receive backlight control information from the input unit, and output a control voltage and a control command to the voltage adjustment unit, and configured to instruct the switching unit to perform switching;
  • the voltage adjustment unit adjusts the control voltage from the processing unit according to the control command, and inputs the adjusted voltage to the backlight driving control unit;
  • the backlight drive control unit controls the backlight brightness of the display by using the control voltage output by the voltage adjustment unit.
  • the temperature sensor is used to detect the ambient temperature to obtain the voltage value, and then the backlight control voltage of the LCD is adjusted to realize the adaptive adjustment of the backlight brightness to reduce the temperature of the display and adapt the display. Changes in ambient temperature.
  • the technical solution provided by the embodiment of the present invention achieves adjustment of backlight brightness by manually inputting control information.
  • the technical solution provided by the embodiment of the invention is easy to implement and low in cost. The user can choose to adjust the backlight automatically and manually, so that the display can adjust its brightness based on the environmental conditions, improve the display of the display, and reduce the heat of the display, thus extending the life of the whole machine.
  • FIG. 1 is a flowchart of a backlight control method of a display provided in an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a voltage conversion principle in an embodiment of the present invention.
  • FIG. 3 is a structural diagram of a backlight control device of a display according to an embodiment of the present invention. detailed description
  • the invention provides a technical solution capable of adjusting the backlight of the display based on the ambient temperature, in particular, the voltage value obtained by detecting the ambient temperature by the temperature sensor is adjusted, and then the backlight control voltage of the LCD is adjusted to realize the brightness of the backlight.
  • the adjustment at the same time through the adjustment of the backlight to reduce the temperature of the whole machine, so that the whole machine works in a suitable environment.
  • adjust the backlight brightness by manually inputting control information.
  • the user can choose to automatically adjust and manually adjust the backlight, so that the display adjusts its brightness based on the environmental conditions, improves the display effect of the display, and also reduces the heat generation of the display, thereby achieving the purpose of extending the life of the whole machine.
  • a backlight control method for a liquid crystal display includes: S01, obtaining a temperature of an environment in which the display is located, and converting the temperature into a voltage signal u. .
  • a temperature detector such as a temperature sensor is provided in the vicinity of the display.
  • the temperature detector detects the temperature of the environment in which the display is located and outputs a voltage signal u based on the temperature. .
  • a temperature U is detected by detecting a temperature of the display using a temperature detecting module.
  • the voltage value is converted to a voltage U by a voltage conversion (specifically, a voltage difference ratio operation circuit can be used).
  • the conversion is performed to obtain a control voltage for controlling the brightness of the LCD backlight.
  • the voltage U will be.
  • the voltage difference ratio operation circuit outputs an LCD control voltage.
  • the voltage signal is output after being amplified by the operational amplifier.
  • R2 is the resistance connected between the negative and output terminals of the operational amplifier.
  • the reference voltage V is assumed.
  • U 1 (R2/R1) (5- U 0 )
  • the resistors R2 and R1 can be configured so that the output voltage value is in an appropriate range
  • the LCD control voltage detects the output voltage U with temperature.
  • the converted voltage signal is input to the backlight driving circuit. Since the LCD control voltage detects the output voltage U with temperature. Increase and decrease, with U. The decrease is increased, that is, when the temperature rises, the brightness of the LCD backlight is lowered, and when the temperature is restored, the brightness of the display is increased, and the brightness of the backlight is adapted to the environment. This allows control of the brightness of the LCD backlight.
  • the LCD backlight drive control unit is a voltage inverter unit that varies with the input control voltage signal (0 ⁇ 5V), and the inverter outputs different LCD backlight drive voltages to control the brightness of the LCD backlight tube.
  • an embodiment of the present invention further provides a backlight control device 300 for a display, comprising: a temperature sensor 31 for obtaining a temperature of an environment in which the display is located and converting the temperature into a voltage signal U. ;
  • the voltage conversion unit 32 uses the voltage difference ratio operation circuit to the voltage signal U. Performing conversion, outputting the converted voltage signal to the backlight driving unit 33;
  • the backlight driving control unit 33 controls the backlight brightness of the display by using the converted voltage signal.
  • the voltage conversion unit 32 includes:
  • R1 is the resistance between the output of the connected temperature sensor and the negative terminal of the operational amplifier
  • R2 is the resistance connected between the negative terminal of the operational amplifier and the output of the operational amplifier
  • the backlight control device 300 further includes:
  • the input unit 34 is configured to input backlight control information
  • the processing unit 35 is configured to receive backlight control information from the input unit 34, and output control voltage and control commands to the voltage adjustment unit 36, and is used to instruct the switching unit 37 to perform switching; the voltage adjustment unit 36, according to the control command Controlling voltage adjustment from the processing unit 35, the adjusted voltage is input to the backlight drive control unit 33;
  • the backlight drive control unit 33 controls the backlight luminance of the display by the control voltage output from the voltage adjustment unit 36.
  • the backlight driving control unit 33 is a voltage inverting unit capable of generating a high voltage to point Bright CCFL lamp for LCD display.
  • the input interface of the backlight driving control unit 33 mainly has voltage, ground and brightness adjustment voltage input, etc., and the brightness adjustment voltage input can be changed to adjust the brightness of the display backlight.
  • the backlight control device 300 further includes:
  • the switching unit 37 is connected to the voltage converting unit 32, the voltage adjusting unit 36, and the backlight driving control unit 33, respectively, for switching according to the instruction of the processing unit 35, and outputting the voltage converting unit 32.
  • One of the voltage signal and the control voltage output from the voltage adjustment unit 36 is input to the backlight drive control unit 33.
  • the input unit 34 employs a key input module, a processing unit 35 processor module, and the voltage adjustment unit 36 employs a digital potentiometer.
  • the button input module divides and lowers two buttons.
  • One button input represents a level of brightness increase or decrease, and controls the output voltage value of the digital potentiometer to control the LCD backlight drive unit to adjust the backlight brightness of the LCD.
  • the manually adjusted control value can be accessed in the accessor.
  • the temperature sensor is used to detect the ambient temperature to obtain the voltage value of the output, and then the backlight control voltage of the LCD is adjusted to achieve adaptive adjustment of the backlight brightness to reduce the temperature of the display device. , adapt the display device to changes in ambient temperature. Or adjust the backlight brightness by manually inputting control information.
  • the invention has the advantages of simple operation and low cost, so that the user can select automatic adjustment and manual adjustment of the backlight, so that the display can adjust the brightness of the display based on the environmental condition, improve the display effect of the display, and also reduce the heat generation of the display, thereby extending the whole machine. The purpose of life.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

L'invention porte sur un procédé et un dispositif pour commander un rétroéclairage d'un dispositif d'affichage à cristaux liquides, le procédé comportant les étapes suivantes : l'obtention de la température ambiante du dispositif d'affichage et la conversion de la température en un signal de tension U0 (S01), la transformation du signal de tension U0 en un signal de tension U1 à l'aide d'un circuit à fonctionnement proportionnel pour différenciation de tension (S02), et l'entrée du signal de tension U1 dans un circuit d'attaque de rétroéclairage pour commander la luminosité de rétroéclairage du dispositif d'affichage (S03).
PCT/CN2010/074464 2009-07-23 2010-06-25 Procédé et dispositif de commande du rétroéclairage d'un dispositif d'affichage à cristaux liquides WO2011009364A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN 200910151489 CN101609657B (zh) 2009-07-23 2009-07-23 一种液晶显示器的背光控制方法及装置
CN200910151489.1 2009-07-23

Publications (1)

Publication Number Publication Date
WO2011009364A1 true WO2011009364A1 (fr) 2011-01-27

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PCT/CN2010/074464 WO2011009364A1 (fr) 2009-07-23 2010-06-25 Procédé et dispositif de commande du rétroéclairage d'un dispositif d'affichage à cristaux liquides

Country Status (2)

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CN (1) CN101609657B (fr)
WO (1) WO2011009364A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101609657B (zh) * 2009-07-23 2011-12-28 三一重工股份有限公司 一种液晶显示器的背光控制方法及装置
TWI575505B (zh) * 2012-03-29 2017-03-21 天鈺科技股份有限公司 具有顯示屏的電子裝置及調節顯示單元亮度的方法
CN103414832B (zh) * 2013-08-30 2017-03-29 努比亚技术有限公司 调节终端屏幕亮度的方法及装置
CN105741716A (zh) * 2014-12-12 2016-07-06 环旭电子股份有限公司 显示装置及其背光强度调整方法
CN105280147A (zh) * 2015-10-15 2016-01-27 珠海格力电器股份有限公司 显示器的控制方法及控制系统
CN106855792A (zh) * 2015-12-09 2017-06-16 小米科技有限责任公司 一种具有显示功能的终端
CN105609057B (zh) * 2015-12-30 2019-03-15 中航华东光电有限公司 防止lcd液晶屏高温液化的方法
CN111016798B (zh) * 2019-12-18 2023-05-12 宁波华翔视讯电子有限公司 一种流媒体后视镜温度控制方法
CN111524488B (zh) * 2020-04-13 2021-05-11 广东天波信息技术股份有限公司 一种防止显示屏过热的自适应调节方法及装置
CN112181017A (zh) * 2020-09-17 2021-01-05 武汉海微科技有限公司 基于车载显示屏的温度保护算法

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CN1516103A (zh) * 2003-01-04 2004-07-28 三星电子株式会社 显示装置和方法
CN1763592A (zh) * 2004-10-22 2006-04-26 南京Lg同创彩色显示系统有限责任公司 自动调节亮度的液晶显示器
JP2006351319A (ja) * 2005-06-15 2006-12-28 Fujitsu Ten Ltd 輝度制御方法及び輝度制御装置及び表示装置
CN101013229A (zh) * 2006-02-02 2007-08-08 三星电子株式会社 具有多个发光元件的背光单元及其控制方法
CN200962169Y (zh) * 2006-06-19 2007-10-17 深圳市新超亮特种显示设备有限公司 一种宽温高亮液晶显示器
US20080049005A1 (en) * 2006-07-12 2008-02-28 Mitsutaka Okita Liquid crystal display device
CN101609657A (zh) * 2009-07-23 2009-12-23 三一重工股份有限公司 一种液晶显示器的背光控制方法及装置

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1516103A (zh) * 2003-01-04 2004-07-28 三星电子株式会社 显示装置和方法
CN1763592A (zh) * 2004-10-22 2006-04-26 南京Lg同创彩色显示系统有限责任公司 自动调节亮度的液晶显示器
JP2006351319A (ja) * 2005-06-15 2006-12-28 Fujitsu Ten Ltd 輝度制御方法及び輝度制御装置及び表示装置
CN101013229A (zh) * 2006-02-02 2007-08-08 三星电子株式会社 具有多个发光元件的背光单元及其控制方法
CN200962169Y (zh) * 2006-06-19 2007-10-17 深圳市新超亮特种显示设备有限公司 一种宽温高亮液晶显示器
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CN101609657A (zh) * 2009-07-23 2009-12-23 三一重工股份有限公司 一种液晶显示器的背光控制方法及装置

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CN101609657A (zh) 2009-12-23
CN101609657B (zh) 2011-12-28

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