WO2011009364A1 - Method and device for controlling backlight of liquid crystal display - Google Patents

Method and device for controlling backlight of liquid crystal display 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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Prior art keywords
voltage
backlight
voltage signal
display
unit
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PCT/CN2010/074464
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French (fr)
Chinese (zh)
Inventor
周翔
张钰旻
童晓斌
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湖南三一智能控制设备有限公司
三一重工股份有限公司
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Publication of WO2011009364A1 publication Critical patent/WO2011009364A1/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
    • G09G3/34—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.

Abstract

A method and a device for controlling a backlight of a liquid crystal display are provided, wherein the method comprises the following steps: obtaining the ambient temperature of the display and converting the temperature into a voltage signal U0 (S01), transforming the voltage signal U0 into a voltage signal U1 by utilizing a voltage differencing proportion operating circuit (S02), inputting the voltage signal U1 into a backlight drive circuit for controlling backlight brightness of the display (S03).

Description

一种液晶显示器的背光控制方法及装置  Backlight control method and device for liquid crystal display
本申请要求于 2009 年 7 月 23 日提交中国专利局、 申请号为 200910151489.1、 发明名称为 "一种液晶显示器的背光控制方法及装置" 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。  The present application claims priority to Chinese Patent Application No. 200910151489.1, entitled "Backlight Control Method and Apparatus for Liquid Crystal Display", filed on July 23, 2009, the entire contents of which are incorporated herein by reference. In this application.
技术领域 Technical field
本发明涉及显示器技术领域， 具体涉及液晶显示器的背光控制方法及装 置。  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.
背景技术 Background technique
工业生产自动化设备通常安装有显示器，这些显示器作为人机界面用于显 示设备状态及操作控制， 这些显示器是一种嵌入式计算机产品。 液晶显示器以 它体积小， 重量轻， 显示画面更清晰的优点， 被广泛地用做人机界面。  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.
液晶显示器的显示技术不同于其他显示器。其中的液态晶体分子本身并无 发光特性， 需要靠一个背光板模块来提供显示器面板所需光源。 液晶显示器 The display technology of liquid crystal displays is 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
( LCD )所需的光源是利用驱动高压冷阴极荧光灯管 （CCFL ) , 使得光投射至 背光板， 达到显示图像的目的。 当外界环境变化时， 使用者往往会因为背光亮 度不够看不清画面显示内容。 因此， 有必要提供一个背光亮度调节单元， 以适 应不同环境的使用要求。 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. When the external environment changes, the user often does not see the screen display content because the backlight brightness is insufficient. Therefore, it is necessary to provide a backlight brightness adjustment unit to suit the requirements of different environments.
由于工程机械的使用环境温度较高， 而显示器内部具有发热器件，很容易 因为过热影响显示器的使用寿命。显示器的热量主要是背光灯散发出来，因此， 可以通过控制背光来降低显示器温度， 达到保护显示器的目的。  Due to the high ambient temperature of the construction machinery and the presence of heat-generating components inside the display, it is easy to affect the life of the display due to overheating. 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.
现有技术中提供的一种显示器温度的控制方法，通过温度侦测单元检测显 示器温度， 由中央处理器将该温度信号与预设基准温度相比， 决定冷阴极灯管 的驱动电力大小，使得显示器的温度低于或保持在预定的基准温度。现有技术 的缺点是需要采用处理器进行控制， 控制过程过于复杂， 而且成本较高。  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.
发明内容 Summary of the invention
本发明实施例提供一种液晶显示器的背光控制方法及装置，可实现背光亮 度的自适应调节， 降低显示器的温度。  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.
本发明实施例提供一种液晶显示器的背光控制方法， 包括：  Embodiments of the present invention provide a backlight control method for a liquid crystal display, including:
获取显示器所处环境的温度并将该温度转换为电压信号 U。； 利用电压求差比例运算电路对所述电压信号 U。进行转换得到电压信号 ； 将转换后的电压信号 输入到背光驱动电路， 利用所述电压信号 控制 显示器的背光亮度。 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.
本发明实施例提供一种液晶显示器的背光控制装置， 包括：  Embodiments of the present invention provide a backlight control apparatus for a liquid crystal display, including:
温度传感器，用于获取显示器所处环境的温度并将该温度转换为电压信号 a temperature sensor for obtaining the temperature of the environment in which the display is located and converting the temperature into a voltage signal
U。； U. ;
电压转换单元， 利用电压求差比例运算电路对所述电压信号 U。进行转换， 输出转换后的电压信号 至背光驱动电路；  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;
背光驱动控制单元， 利用所述转换后的电压信号 控制显示器的背光亮 度。  A backlight driving control unit controls the backlight brightness of the display by using the converted voltage signal.
更适宜地， 该背光控制装置还包括：  Preferably, the backlight control device further comprises:
输入单元， 用于输入背光控制信息；  An input unit, configured to input backlight control information;
处理单元， 用于接收来自所述输入单元的背光控制信息， 并输出控制电压 及控制命令给电压调整单元， 并用于指示切换单元进行切换；  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;
电压调整单元， 根据所述控制命令对来自所述处理单元的控制电压调整， 将调整后的电压输入到背光驱动控制单元；  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;
背光驱动控制单元利用所述电压调整单元输出的控制电压控制显示器的 背光亮度。  The backlight drive control unit controls the backlight brightness of the display by using the control voltage output by the voltage adjustment unit.
上述本发明实施例提供的技术方案中，利用温度传感器检测环境温度得到 电压值再经转换后对 LCD的背光控制电压进行调节，实现背光亮度的自适应调 节， 以降低显示器的温度， 使显示器适应环境温度的变化。 或本发明实施例提 供的技术方案通过人工输入控制信息实现背光亮度的调节。本发明实施例提供 的技术方案筒单易行， 成本低。 用户可选择自动调节和手动调节背光， 以使得 显示器能够基于环境状况调节自身亮度，提高显示器的显示效果， 同时也降低 了显示器的发热度， 从而实现延长整机寿命的目的。  In the technical solution provided by the embodiment of the present invention, 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. Or 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.
附图说明 DRAWINGS
图 1是本发明实施例中提供的显示器的背光控制方法流程图；  1 is a flowchart of a backlight control method of a display provided in an embodiment of the present invention;
图 2是本发明实施例中的电压转换原理示意图；  2 is a schematic diagram of a voltage conversion principle in an embodiment of the present invention;
图 3本发明实施例提供的一种显示器的背光控制装置架构图。 具体实施方式 FIG. 3 is a structural diagram of a backlight control device of a display according to an embodiment of the present invention. detailed description
本发明提供了一种能够基于环境温度对显示器的背光进行调节的技术方 案，具体是利用温度传感器检测环境温度得到的电压值再经转换后对 LCD的背 光控制电压进行调节， 实现背光亮度的自适应调节， 同时通过背光的调节实现 降低整机温度，使整机工作在合适的环境下。或通过手动输入控制信息实现背 光亮度的调节。这样用户可选择自动调节和手动调节背光， 以使得显示器基于 环境状况调节自身亮度，提高显示器的显示效果， 同时也降低了显示器的发热 度， 从而实现延长整机寿命的目的。  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. Adapt to 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. Or adjust the backlight brightness by manually inputting control information. In this way, 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.
参照图 1 , 本发明实施例提供的一种液晶显示器的背光控制方法， 包括： S01 , 获取显示器所处环境的温度并将该温度转换为电压信号 u。。  Referring to FIG. 1, a backlight control method for a liquid crystal display according to an embodiment of the present invention includes: S01, obtaining a temperature of an environment in which the display is located, and converting the temperature into a voltage signal u. .
具体地， 在显示器附近设置温度检测器， 如温度传感器。  Specifically, a temperature detector such as a temperature sensor is provided in the vicinity of the display.
该温度检测器检测所述显示器所处环境的温度并基于该温度输出电压信 号 u。。  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. .
S02 , 利用电压求差比例运算电路对所述电压信号 U。进行转换得到电压信 号 。  S02, using the voltage difference ratio operation circuit to the voltage signal U. The conversion is performed to obtain a voltage signal.
参照图 2 , 利用温度检测模块检测显示器的环境温度输出一个电压 U。， 该 电压值通过电压转换（具体可采用电压求差比例运算电路）对电压 U。进行转 换得到一控制电压， 用于控制 LCD背光亮度。 具体将电压 U。输入到电压求差 比例运算电路， 电压求差比例运算电路输出一个 LCD控制电压 。  Referring to FIG. 2, 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. Specifically, the voltage U will be. Input to the voltage difference proportional operation circuit, the voltage difference ratio operation circuit outputs an LCD control voltage.
将电压信号 U。通过电阻 R1接入到运算放大器的负极，基准电压 V。接入到 运算放大器的正极。  Will voltage signal U. Connected to the negative terminal of the operational amplifier through resistor R1, the reference voltage V. Connect to the positive terminal of the op amp.
经所述运算放大器放大后输出电压信号 。  The voltage signal is output after being amplified by the operational amplifier.
Ui = (R2/R1) ( V。 - Uo)  Ui = (R2/R1) (V. - Uo)
其中， R2为连接在运算放大器的负极与输出端之间的电阻。  Where R2 is the resistance connected between the negative and output terminals of the operational amplifier.
假定基准电压 V。为 5V， U1 = (R2/R1) (5- U0) , 可对电阻 R2、 R1进行配置 使输出的电压值在合适的范围， LCD控制电压 随温度检测输出电压 U。的增大 而减小， 随 U。的减小而增大， 即当温度升高时， 降低 LCD背光的亮度， 温度 恢复时提高显示器的亮度， 使其背光亮度适应环境变化。 The reference voltage V is assumed. For 5V, 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, and 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 environmental change.
S03 , 将转换后的电压信号 输入到背光驱动电路， 利用所述电压信号 控制显示器的背光亮度。 S03, inputting the converted voltage signal to the backlight driving circuit, using the voltage signal Controls the backlight brightness of the display.
将转换后的电压信号 输入到背光驱动电路。 由于 LCD控制电压 随温 度检测输出电压 U。的增大而减小， 随 U。的减小而增大， 即当温度升高时， 降 低 LCD背光的亮度， 温度恢复时提高显示器的亮度，使其背光亮度适应环境变 化。 这样可实现对 LCD背光亮度的控制。  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.
LCD 背光驱动控制单元为一电压逆变单元， 随输入的控制电压信号 （0 ~ 5V )变化，而逆变输出不同的 LCD背光驱动电压以控制 LCD的背光灯管的亮度。  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.
参照图 3 , 本发明实施例还提供一种显示器的背光控制装置 300 , 包括： 温度传感器 31 , 用于获取显示器所处环境的温度并将该温度转换为电压 信号 U。；  Referring to FIG. 3, 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. ;
电压转换单元 32 , 利用电压求差比例运算电路对所述电压信号 U。进行转 换， 输出转换后的电压信号 给背光驱动单元 33;  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;
背光驱动控制单元 33 , 利用所述转换后的电压信号 控制显示器的背光 亮度。  The backlight driving control unit 33 controls the backlight brightness of the display by using the converted voltage signal.
其中， 电压转换单元 32包括：  The voltage conversion unit 32 includes:
运算放大器， 用于将基准电压 V。与所述电压信号 U。的差进行放大得到输 出电压信号 u1: An operational amplifier that is used to turn the reference voltage V. And the voltage signal U. The difference is amplified to obtain the output voltage signal u 1:
Ui = (R2/R1) ( V。 - Uo)  Ui = (R2/R1) (V. - Uo)
其中 R1为连接温度传感器输出端与运算放大器的负极之间的电阻， R2为 连接在运算放大器的负极与运算放大器的输出端之间的电阻。  Where R1 is the resistance between the output of the connected temperature sensor and the negative terminal of the operational amplifier, and R2 is the resistance connected between the negative terminal of the operational amplifier and the output of the operational amplifier.
背光控制装置 300 , 还包括：  The backlight control device 300 further includes:
输入单元 34 , 用于输入背光控制信息；  The input unit 34 is configured to input backlight control information;
处理单元 35 , 用于接收来自所述输入单元 34的背光控制信息， 并输出控 制电压及控制命令给电压调整单元 36 , 并用于指示切换单元 37进行切换； 电压调整单元 36 , 根据所述控制命令对来自所述处理单元 35的控制电压 调整， 将调整后的电压输入到背光驱动控制单元 33;  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;
背光驱动控制单元 33利用所述电压调整单元 36输出的控制电压控制显示 器的背光亮度。  The backlight drive control unit 33 controls the backlight luminance of the display by the control voltage output from the voltage adjustment unit 36.
具体地， 背光驱动控制单元 33为一电压逆变单元， 能产生一高电压以点 亮液晶显示器的 CCFL灯管。 背光驱动控制单元 33的输入端接口主要有电压、 地和亮度调节电压输入等，可利用改变亮度调节电压输入以调节显示器背光的 亮度。 Specifically, 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.
背光控制装置 300 , 还包括：  The backlight control device 300 further includes:
切换单元 37 , 分别与所述电压转换单元 32、所述电压调整单元 36以及背 光驱动控制单元 33相连接， 用于根据所述处理单元 35的指示进行切换， 将所 述电压转换单元 32输出的电压信号 与所述电压调整单元 36输出的控制电 压中之一输入到所述背光驱动控制单元 33。  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.
具体地， 输入单元 34采用按键输入模块、 处理单元 35处理器模块， 电压 调整单元 36采用数字电位器。  Specifically, 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.
按键输入模块， 分升高和降低两个按键， 一次按键输入代表亮度升高或降 低一个等级， 控制数字电位器的输出电压值， 以控制 LCD背光驱动单元， 从而 调节 LCD的背光亮度。 同时， 手动调节的控制值能存取在存取器中， 下次开机 时， 若为手动调节模式， 则以先前存储的亮度值来点亮显示器的背光。  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. At the same time, the manually adjusted control value can be accessed in the accessor. When the power is turned on next time, if it is in the manual adjustment mode, the backlight of the display is illuminated with the previously stored brightness value.
上述本发明实施例提供的技术方案中，利用温度传感器检测环境温度得到 其输出的电压值再经转换后对 LCD的背光控制电压进行调节， 实现背光亮度的 自适应调节， 以降低显示设备的温度， 使显示设备适应环境温度的变化。 或通 过人工输入控制信息实现背光亮度的调节。本发明筒单易行， 成本低这样用户 可选择自动调节和手动调节背光，以使得显示器可基于环境状况调节显示器亮 度， 提高显示器的显示效果， 同时也降低了显示器的发热度， 从而延长整机寿 命的目的。  In the technical solution provided by the embodiment of the present invention, 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.
以上所述仅为本发明的优选实施例而已， 并非用于限定本发明的保护范 围。 凡在本发明的精神和原则之内所作的任何修改、 等同替换、 改进等， 均包 含在本发明的保护范围内。  The above description is only a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

权 利 要 求 Rights request
1、 一种液晶显示器的背光控制方法， 其特征在于， 包括： A backlight control method for a liquid crystal display, comprising:
获取显示器所处环境的温度并将该温度转换为电压信号 U。；  Obtain the temperature of the environment in which the display is located and convert the temperature into a voltage signal U. ;
利用电压求差比例运算电路对所述电压信号 U。进行转换得到电压信号 ； 将转换后的电压信号 输入到背光驱动电路， 利用所述电压信号 控制 显示器的背光亮度。  The voltage signal U is applied to the voltage difference ratio operation circuit. The conversion is performed to obtain a voltage signal; the converted voltage signal is input to a backlight driving circuit, and the backlight signal brightness of the display is controlled by the voltage signal.
2、 如权利要求 1所述的背光控制方法， 其特征在于， 所述获取显示器所 处环境的温度并将该温度转换为电压信号， 具体包括：  2. The backlight control method according to claim 1, wherein the obtaining the temperature of the environment in which the display is located and converting the temperature into a voltage signal comprises:
在所述显示器附近设置温度传感器；  Providing a temperature sensor near the display;
所述温度传感器感应所述显示器所处环境的温度并基于所述温度输出电 压信号 u。。  The temperature sensor senses the temperature of the environment in which the display is located and outputs a voltage signal u based on the temperature. .
3、 如权利要求 1所述的背光控制方法， 其特征在于， 利用电压求差比例 运算电路对所述电压信号进行转换， 具体包括：  3. The backlight control method according to claim 1, wherein the converting the voltage signal by using a voltage difference ratio operation circuit comprises:
将电压信号 U。通过电阻 R1接入到运算放大器的负极，基准电压 V。接入到 运算放大器的正极；  Will voltage signal U. Connected to the negative terminal of the operational amplifier through resistor R1, the reference voltage V. Connected to the positive terminal of the operational amplifier;
经所述运算放大器放大后输出电压信号 U1 ; Outputting a voltage signal U 1 after being amplified by the operational amplifier ;
Ui = (R2/R1) ( V。 - Uo)  Ui = (R2/R1) (V. - Uo)
其中， R2为连接在运算放大器的负极与运算放大器的输出端之间的电阻。 Where R2 is the resistance connected between the negative terminal of the operational amplifier and the output terminal of the operational amplifier.
4、 一种液晶显示器的背光控制装置， 其特征在于， 包括： 4. A backlight control device for a liquid crystal display, comprising:
温度传感器，用于获取显示器所处环境的温度并将所述温度转换为电压信 号 U。；  A temperature sensor is used to obtain the temperature of the environment in which the display is located and convert the temperature into a voltage signal U. ;
电压转换单元， 利用电压求差比例运算电路对所述电压信号 U。进行转换， 输出转换后的电压信号 至背光驱动控制单元；  The voltage conversion unit uses the voltage difference ratio operation circuit to the voltage signal U. Performing conversion, outputting the converted voltage signal to the backlight driving control unit;
背光驱动控制单元， 利用所述转换后的电压信号 控制所述显示器的背 光亮度。  A backlight driving control unit controls the backlight brightness of the display by using the converted voltage signal.
5、 如权利要求 4所述的背光控制装置， 其特征在于， 所述电压转换单元 包括：  The backlight control device according to claim 4, wherein the voltage conversion unit comprises:
运算放大器， 用于将基准电压 V。与所述电压信号 U。的差进行放大得到输 出电压信号 ， Ui = (R2/R1) ( V。 - Uo) An operational amplifier that is used to turn the reference voltage V. And the voltage signal U. The difference is amplified to obtain an output voltage signal, Ui = (R2/R1) (V. - Uo)
其中， Rl 为连接温度传感器输出端与运算放大器的负极之间的电阻， R2 为连接在运算放大器的负极与运算放大器的输出端之间的电阻。  Where R1 is the resistance between the output of the connected temperature sensor and the negative terminal of the operational amplifier, and R2 is the resistance connected between the negative terminal of the operational amplifier and the output of the operational amplifier.
6、 如权利要求 4所述的背光控制装置， 其特征在于， 还包括：  The backlight control device of claim 4, further comprising:
输入单元， 用于输入背光控制信息；  An input unit, configured to input backlight control information;
处理单元， 用于接收来自所述输入单元的背光控制信息， 并输出控制电压 及控制命令给电压调整单元， 并用于指示切换单元进行切换；  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;
电压调整单元， 根据所述控制命令对来自所述处理单元的控制电压调整， 将调整后的电压输入到背光驱动控制单元；  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;
背光驱动控制单元，利用所述电压调整单元输出的控制电压控制所述显示 器的背光亮度。  A backlight driving control unit controls a backlight brightness of the display by using a control voltage output by the voltage adjusting unit.
7、 如权利要求 4所述的背光控制装置， 其特征在于， 还包括：  The backlight control device of claim 4, further comprising:
切换单元， 分别与所述电压转换单元、所述电压调整单元以及背光驱动控 制单元相连接， 用于根据所述处理单元的指示进行切换， 将所述电压转换单元 输出的电压信号 与所述电压调整单元输出的控制电压中之一输入到所述背 光驱动控制单元。  a switching unit, respectively connected to the voltage conversion unit, the voltage adjustment unit, and the backlight driving control unit, configured to perform switching according to an instruction of the processing unit, and output a voltage signal and the voltage of the voltage conversion unit One of the control voltages output by the adjustment unit is input to the backlight drive control unit.
PCT/CN2010/074464 2009-07-23 2010-06-25 Method and device for controlling backlight of liquid crystal display WO2011009364A1 (en)

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