CN1662949A - 用于电子显示器的基于led的白光背照 - Google Patents

用于电子显示器的基于led的白光背照 Download PDF

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CN1662949A
CN1662949A CN038140233A CN03814023A CN1662949A CN 1662949 A CN1662949 A CN 1662949A CN 038140233 A CN038140233 A CN 038140233A CN 03814023 A CN03814023 A CN 03814023A CN 1662949 A CN1662949 A CN 1662949A
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led
white light
photodiode
light
optical waveguide
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S·马图
F·J·舒尔曼斯
C·昌
J·盖恩斯
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Koninklijke Philips NV
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/3406Control of illumination source
    • G09G3/3413Details of control of colour illumination sources
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20Controlling the colour of the light
    • H05B45/22Controlling the colour of the light using optical feedback
    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/20Controlling the colour of the light
    • H05B45/28Controlling the colour of the light using temperature feedback
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/04Maintaining the quality of display appearance
    • G09G2320/043Preventing or counteracting the effects of ageing
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0606Manual adjustment
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/0633Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0626Adjustment of display parameters for control of overall brightness
    • G09G2320/064Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/06Adjustment of display parameters
    • G09G2320/0666Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00Aspects of the architecture of display systems
    • G09G2360/14Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen

Abstract

用来背照一个具有LED的电子显示器的设备和方法,通过一个微处理器利用反馈控制来控制发光度、发射功率和颜色电平,从而保持白光在一个充分稳定的电平上,该电平可以由一个操作者来选择。

Description

用于电子显示器的基于LED的白光背照
技术领域
本发明总体上涉及一种用于液晶显示器(LCD)或其它电子显示器的背照系统,特别地,涉及控制一个红-绿-蓝(RGB)发光二极管(LED)背光的颜色与流明电平,以及控制这种背照的传感器。
背景技术
利用RGB LED产生的白光来背照对于本领域内的技术人员来说是已知的。然而,LED的特性随温度、电流、使用年限而变化。这些特性在不同批次的LED中也不同。因此,需要一种反馈控制来保持这样一个背照系统的颜色和流明电平在设定的限制之内。为了使该反馈控制满意地工作,传感器必须正确地放置以提供必要的光学反馈。
发明内容
本发明提供了用于背照一个具有LED的电子显示器的设备和方法,通过一个微处理器利用反馈控制来控制发光度、发射功率、三色电平,从而维持白光背照在充分稳定的电平上,该电平可以由操作者来选择。
在本发明的一个实施例中,利用白光来背照一个电子显示器的设备包括:多个发光二极管(LED),每一个LED有效地发射一种单色光;至少一个光源,该光源由位于用来产生白光的一个组合中的至少三个LED组成;一个有效地利用白光照亮该显示器的光波导;和通过控制至少一个光源来有效地维持白光在一个充分稳定的颜色和发光度电平上的电路。本发明的这个实施例利用一种方法用白光来背照电子显示器,该方法包含步骤:驱动多个LED,每个LED发射一种单色光;结合从至少三个LED发射出的光来形成白光;利用白光照亮显示器;利用反馈电路控制白光的颜色和亮度。
在本发明的另一个实施例中,提供了利用白光来背照一个电子显示器的设备,该设备包括:用于驱动多个LED的装置,每个LED发射一种单色光;用于结合从至少三个LED发射出的光来形成白光的装置;利用白光来照亮显示器的装置;用于通过反馈电路控制白光的颜色和亮度的装置;用于控制的所述装置受制于一个操作者的命令。本发明致力于一个或多个这样的问题。
附图说明
在附图中,全文中类似的参考数字代表相应的元件或部分,其中:
图1示出了本发明的一个设备,该设备利用由一个微处理器控制的RGB LED来背照一个LCD或其它电子显示器;
图2示出了在一个光波导中光敏器件的放置;并且
图3示出了当只使用一个单侧光源时在一个光波导中光敏器件的放置。
具体实施方式
参见图1,示出了一个用于控制白光的装置,用于充分地统一一个LCD 100或类似的显示器的背照,利用一个电源供给110,该电源供给110从一个交流电源115获得电能。电源供给110进一步包含多个LED驱动器120、130、140,各个驱动器分别用作红、绿、和蓝驱动器。每个LED驱动器120、130、140被连接到多个同样颜色的LED,这些LED以合适的串联和并联组合方式连接,该组合包含多个光源150、160中的每一个。
光源150、160各被埋置在散热片190、200内,用来避免LED的过热并最大化颜色的一致性。光源150、160依次安装在光波导170的边缘上。颜色的一致性通过在每个光源150、160上形成一个单位的白色电池来保持,其中光源150、160为合适的LED组合形式,如R-G-B、R-G-B-G、G-R-B等等,用来最大化颜色的一致性。光学结构把来自光源150、160的LED的光耦合到光波导170上。
LED驱动器120、130、140提供在电源110中被合适地转换的电流给光源150、160中的LED。一个微处理器180,被编程具有用来控制光波导170中的颜色和光度电平的必要功能,提供控制来自LED驱动器120、130、140的电流的信号。多个光敏器件210通过一个电路230发送反馈来允许微处理器180改变被送往LED驱动器120、130、140的信号。这些信号可以采用幅度调制、PWM信号或其它的适合的值的形式。一个控制器240供给微处理器180信号,该信号用来确定一个由光波导170背照的LCD或其它电子显示器(未示出)的颜色和亮度电平。
反馈控制用来保持光波导170中的颜色和亮度。没有这些控制的话,光源150、160中的各个LED的特性上的差异将造成光波导170中的颜色和亮度在不可接受的范围内变化。所需的反馈控制取决于通过传感进行的合适的采样。
在本发明的第一实施例中,光源150、160的温度在散热片190、200内被感知。微处理器180被编程来补偿光波导170中颜色和光度上的与温度有关的差异,该差异是由光源150、160中LED的特性的差异所引起的。该补偿通过调节由LED驱动器120、130、140发送给LED的电流来实现。第一实施例没有用来克服各LED的老化效应的机制。
在本发明的第二实施例中,光电二极管210通过无过滤的光电二极管、具有Y过滤器的光电二极管、或其它合适的装置,来测量光波导170中流明电平和发射功率电平中的至少一个。微处理器180被编程来补偿光波导170中颜色和亮度的差异,该差异是由光源150、160中LED的特性的差异所引起的,该补偿通过调节来自LED驱动器120、130、140的电流到想要的流明电平和/或发射功率。第二实施例不能克服因为温度上的差异引起的颜色上的差异。
在第三实施例中,在散热片190、200内的温度和光波导170中流明电平或发射功率电平中的至少一个都被感知,如第一和第二实施例中所描述的,并被供应给微处理器180。通过编程微处理器180来调节来自LED驱动器120、130、140的电流,以响应两组反馈激励,本发明的这个实施例补偿光源150、160中LED的老化和温度的差异。
在第四实施例中,光电二极管210被配置了合适的过滤器以感知光波导170中的白光的三色的数值。这些三色数值(或其它颜色的测量值),被反馈给已合适地编程的微处理器180,调节LED驱动器120、130、140的电流为光波导170中的光匹配三色数值,使之与参考值相匹配。
在第五实施例中,散热片190、200内的温度被测量以把温度补偿加到根据第四实施例被调节的三色值上。
在以上所有的实施例中,来自光波导170的白光的颜色和流明电平能够由一个操作者人工设置或由控制电路自动设置。
为确保颜色的一致性,传感器必须被正确地安置用来为一致的颜色控制提供必要的反馈成份。再次参见图1,散热片190、200中的每一个有三个温度传感器250。散热片190、200中的温度传感器250的放置取决于后者的温度曲线图。反馈控制基于温度传感器250的输出的加权平均。
本发明需要一对光电二极管210的最小化,但是它们的放置可以变化。再次参见图1,第一实施例放置每一对光电二极管210在光波导170的两侧的每一侧的中间位置。
参见图2,第二实施例把光电二极管210放置在光波导170的内面,在它的主体部分与下面的反射体之间。光波导170中的光由至少一组光电二极管210传感,并且来自该组的所有光电二极管的光的均值由微处理器180使用。图2示出了三组光敏器件260、270和280。它们被基本排成一行地放置在一个平面的光波导170的中间,光敏器件270在该行的中间位置,并且光敏器件260、280各被放置在距离边界约四分之一的地方。
参见图3,在该实施例中只有一个单一光源可以照亮光波导170,即光源150被埋置于散热片190中用于光波导170的单侧照明,并且没有如图1所示的光源160。当光源150是单独一个时,光敏器件260、270和280可以被放置在光波导170的与光源150相对的一侧。它们与光敏器件270放置在一行并在该行的中间,并且光敏器件260、280各被放置在距离边界约四分之一的地方。
光电二极管210与温度传感器250的许多其它的位置和数目在本发明中是可能的。
功能描述
参照附图已经描述了本发明的优选实施例,可以理解本发明并不局限于那些确定的实施例,并且各种变化与修正可以由本领域内的技术人员在其中实施,而不背离如附加的权利要求所定义的本发明的范围或精神。本发明的其它方面和特征可以从对附图、公开内容、以及附加的权利要求的研究中获得。

Claims (20)

1.一种用白光来背照一个电子显示器的设备,包含:
多个光发射二极管LED(120,130,140),每个所述的LED有效地用于发射一种单色光;
至少一个由至少三个所述LED组成的光源(150,160),该LED被排列成一种产生白光(210)的组合;
一个光波导(170),有效地用所述白光照明所述显示器;
电路(230),通过控制所述至少一个光源来有效地用于维持所述白光在一个充分稳定的颜色和流明电平;并且
所述的电路可以被自动或人工地控制(180)。
2.如权利要求1所述的设备,其中所述电路包括一个有效地用于控制流向所述LED的电流的微处理器(180)。
3.如权利要求2所述的设备,其中所述电路包括至少一组光电二极管(210),该光电二极管有效地用于测量所述光波导(120)的发光度并将它的值发送给所述微处理器(180)。
4.如权利要求2所述的设备,其中所述电路包括至少一组光电二极管(210),该光电二极管有效地用于测量所述光波导(170)中的发射功率电平并将它的值发送给所述微处理器(180)。
5.如权利要求2所述的设备,其中所述电路包括至少一组光电二极管(210),该光电二极管有效地用于测量所述光波导的所述白光的颜色值并将所述值发送给所述微处理器(180)。
6.如权利要求2所述的设备,其中所述多个LED被埋置在至少一个散热片(190,200)中,所述散热片被配备至少一个传感器,该传感器有效地用于测量所述LED的温度并发送所述温度至所述微处理器(180)。
7.如权利要求6所述的设备,其中有效地用于测量所述光波导(170)的发光度的所述传感器和至少一组光电二极管(210)同时发送输出至所述微处理器(180)。
8.如权利要求6所述的设备,其中有效地用于测量所述光波导(170)中的发射功率电平的所述传感器和至少一组光电二极管(210)同时发送输出至所述微处理器(180)。
9.如权利要求6所述的设备,其中有效地用于测量所述光波导(170)中的所述白光的三色值的所述传感器和至少一组光电二极管(210)同时发送输出至所述微处理器(180)。
10.如权利要求1所述的设备,其中所述至少一组光电二极管(210)包含三个二极管,这些二极管在一行中彼此相距一个有效距离,沿着所述光波导(170)的一端放置,与单一的至少一个光源相对,所述组的中间部分(270)被充分地放置在所述端的中心位置。
11.如权利要求1所述的设备,其中所述至少一组光电二极管(210)包含三个二极管(260,270,280),这些二极管在一个水平行中彼此相距一个有效距离,被充分地放置在所述光波导(170)的中间,所述组中的中间部分(270)被充分地放置在所述光波导的中心位置,并且所述至少一个光源为所述光波导的各自端点处的一对光源(260,280)。
12.一种用白光来背照一个电子显示器的方法,该方法包括步骤:
驱动多个LED(120,130,140),每个所述LED发射一种单色光;
结合从至少三个所述LED发射出的光来形成白光;
用所述白光来照亮(160,160)所述显示器;和
通过反馈电路来控制(180)所述白光的颜色和亮度。
13.如权利要求12所述的方法,其中所述控制步骤包含感知所述LED的温度(250)的步骤。
14.如权利要求12所述的方法,其中所述控制步骤包含通过至少一组光电二极管(210)感知所述白光的发射功率电平的步骤。
15.如权利要求12所述的方法,其中所述控制步骤包含通过至少一组光电二极管(210)感知所述白光的发光度的步骤。
16.如权利要求12所述的方法,其中所述控制步骤包含通过至少一组光电二极管感(210)知所述白光的颜色值的步骤。
17.如权利要求12所述的方法,其中所述控制步骤包含使感知的所述白光的三色值与感知的所述LED的温度(250)相结合的步骤。
18.如权利要求12所述的方法,其中所述控制步骤包含使感知的所述白光的发光度(210)与感知的所述LED的温度(250)相结合的步骤。
19.如权利要求12所述的方法,其中所述控制步骤包含使感知的所述白光的发射功率电平(210)与感知的所述LED的温度(250)相结合的步骤。
20.一种用白光来背照一个电子显示器的设备,包含:
用于驱动多个LED(120,130,140)的装置,每个所述LED发射一种单色光;
用于结合从至少三个所述LED发射出的光来形成白光(210)的装置;
用于用所述白光(150160)照亮所述显示器的装置;
用于通过反馈电路(230)控制所述白光的颜色和亮度的装置;和
用于控制的所述装置受制于一个操作者的命令(180)。
CN038140233A 2002-06-17 2003-06-05 用于电子显示器的基于led的白光背照 Pending CN1662949A (zh)

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US10/173,346 US6753661B2 (en) 2002-06-17 2002-06-17 LED-based white-light backlighting for electronic displays
US10/173,346 2002-06-17

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