CN101557670B - Lcd背光的数字控制系统 - Google Patents

Lcd背光的数字控制系统 Download PDF

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CN101557670B
CN101557670B CN2009102035860A CN200910203586A CN101557670B CN 101557670 B CN101557670 B CN 101557670B CN 2009102035860 A CN2009102035860 A CN 2009102035860A CN 200910203586 A CN200910203586 A CN 200910203586A CN 101557670 B CN101557670 B CN 101557670B
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豪尔赫·桑切斯奥莱亚
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CEYX TECHNOLOGIES Inc
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    • H—ELECTRICITY
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    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
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    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
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    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
    • H05B41/2821—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage
    • H05B41/2822—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices by means of a single-switch converter or a parallel push-pull converter in the final stage using specially adapted components in the load circuit, e.g. feed-back transformers, piezoelectric transformers; using specially adapted load circuit configurations
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    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
    • H05B41/14—Circuit arrangements
    • H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
    • H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
    • H05B41/282—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices
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    • H05B41/36—Controlling
    • H05B41/38—Controlling the intensity of light
    • H05B41/39—Controlling the intensity of light continuously
    • H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
    • H05B41/3921—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations
    • H05B41/3925—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor with possibility of light intensity variations by frequency variation
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Abstract

本发明提供一种在LCD显示器中背光系统的数字控制的装置和方法。根据本发明，一种嵌入到微控制器单元的固件中的背光控制系统的操作方法包含以下步骤：设定倒相器为额定值；应用额定电压一次到一个灯上；及为校准的目的自动地对电流电压和发出的光进行测量并进行记录。

Description

LCD背光的数字控制系统
本申请是原案申请号为200480009186.1的发明专利申请(国际申请号：PCT/US2004/003400，申请日：2004年2月6日，发明名称：LCD背光的数字控制系统)的分案申请。
技术领域
本发明涉及在液晶显示器(LCD)中用于控制用来提供背光的荧光灯的一种控制系统、一组电路和方法。所述灯的控制是由可实现数字控制系统的微控制器单元(MCU)进行的。数字控制系统可以使多个灯在相同的倒相电路外驱动，同时还能使每一个灯保持独立的光强度和减低亮度。数字控制系统具有适应性，可补偿诸如老化、工作温度和灯的变化产生的影响。结果是均衡了LCD显示器的灯亮度。改进的性能对那些需要多个灯并且所有的灯必须产生均匀的亮度的显示器，诸如电视机或者高解析度的计算机显示器，十分有益。
背景技术
典型的倒相器和灯电路100如图1中所示。其中，倒相器被包含在一个印刷电路组件(PCA)中。该PCA包含由一个金属氧化物半导体场效应晶体管(Mosfet)开关101、一个线圈102、一个推挽式驱动电路103、一个调谐电容器104、一个变压器105以及一个压载电容器106组成的模拟电路。在该倒相器中的模拟电路的功能是将一个直流(DC)电压输入114在输出时转换为交流(AC)电压115。该倒相器被连接到一个由荧光灯109、电位计110、电阻器111以及整流二极管112组成的灯电路。所述灯可以是一个冷阴极荧光灯(CCFL)。所述电位计110的接线端被连接到一个反馈电路108。该电路感应穿过电位计110和电阻器111产生的半波整流电压，并发送该电压到一个倒相控制器107。该控制器107内含一个模拟电路，它把由反馈电路108感应到的信号与内部参数相比较，作为结果产生一个脉宽调制信号(PWM)，然后该脉宽调制信号使Mosfet101以恰当的方式开和关，从而产生驱动灯109所需的AC 115。该控制器还具有另外一个模拟电路，当第一次给该系统加电时，它允许PWM建立一个相对较大的AC电压115。该在加电时产生的较大电压是产生初始电压(击穿电压)所需的，当需要使荧光开始发光时，初始电压需要用来电离灯中的气体。一旦灯亮起来，施加给灯的电压就可以被降低。为了解决在制造过程中成分的变化，电位计110用于调整灯的亮度。一个单独的减低亮度电压113被连接到倒相控制器107中的内部比较器。该减低亮度电压113被加到来自于灯电流反馈电路108的信号上，从而导致PWM的变化和灯109亮度的变化。
倒相控制器107的使用导致了倒相器和灯电路的模拟控制。模拟控制的一些缺点包括：
1、需要手动调整电位计110来补偿成分变化。
2、不补偿灯109的老化，因为对于等量的电流，老化的灯将产生较低的光强度。
3、控制系统不能适应温度的变化。
图2中是考虑到背光组件的当前系统中的局限性的一个样例。该图表示一种大型LCD屏幕系统200的背光组件。大屏幕可以是LCD技术。大屏幕需要大量的CCFL。目前实现发光组件的方法基本上是倍增图1中的整个组件100。作为该大屏幕系统200一个可以理解的形式，各个倒相器和灯电路都需要单独的手动调整和多个倒相器电路。为了能独立的调整各个灯中的电流，需要多个倒相器。调整灯中的电流改变光的强度。在许多应用中，需要使整个显示板亮度均匀以获得高画质。特别是因为使用了大量的变压器，为装置增加了负担。该大屏幕显示系统200没有使来自灯的光均衡的方法，因为各个倒相器都是彼此独立的。该整体的解决方案是昂贵的、笨重的，需要大量的手工劳动并且灯光强度是不均匀的。同时，随着灯的老化，没有方法补偿光强度的降低。
发明内容
本发明公开了一种用于显示系统的装置，该装置包括：电流控制电路(309-312)，其被配置为控制流经灯(313-316)的电流；以及倒相器(321)，其被配置为产生次级电压，所述倒相器包括与所述电流控制电路(309-312)相连的微控制器单元(301)，所述微控制器单元(301)包括：模拟多路复用器(305)；模数转换器(304)；以及脉宽调制器(302)，其中所述电流控制电路(309-312)利用一个脉宽调制信号按指定的工作循环接通和切断。
本发明还公开了一种校准灯亮度的方法，该方法包含以下步骤：为一个灯设置倒相器为额定电压；以所述额定电压一次打开一个灯；以及当每一个灯被打开时，用光感器测量照明度并用光亮度计测量实际的亮度值。
本发明包含一种LCD背光组件的数字控制系统中使用的操作方法和装置。所述装置包括：一个带有脉宽调制器(PWM)，模数转换器以及其他支持电路的微控制器单元(MCU)。所述装置包括一个电流控制电路。所述过程包括在MCU中的嵌入数字控制软件。本发明提供了由数字控制系统带来的大量的优点。灯亮度的设置是自动的，并且由于他们被植入固件，这些设置对于成分的变化和温度不敏感。所述控制系统可以补偿灯的老化和温度的变化。
本发明的另外一个优势是倒相器和灯系统能够被制造得高效率地运行，因为操作可以自动地适应变化的需求，其转化为施加给灯所需要的不同的电压。
本发明还具有的另外一个优势是降低背光系统的成本及功耗。
附图说明
参照附图，详细的本发明和其优选实施例将可以得到进一步的理解。
图1是一个典型的倒相器和灯电路(100)。
图2所示为大型LCD屏幕系统的背光组件(200)。
图3所示为本发明的装置的一个实施例(300)。
图4所示为在数字控制系统中使用的方法的一个实施例(400)。
图5所示为制造测试和灯光强度校准(500)。
具体实施方式
装置
数字控制系统的一个实施例显示在图3中。该系统被显示为驱动4个荧光灯，但是，其概念可以被扩展到更多个灯。倒相控制器101已经被一个MCU 301所代替。该MCU包括数个脉宽调制器302，一个处理器303，一个A/D转换器304，一个模拟多路复用器305，一个温度传感器306，一个用于与主机或者LCD控制器通讯的I/O 307，ROM和RAM308。该MCU 301是一个包含一个模拟多路复用器305和一个A/D转换器304的复合信号集成电路。
另外，该装置包含电流控制电路309-312，用于控制流经灯313-316的AC电流。这些电路包含一组无源元件和有源元件。这些电路在MCU301的控制下以将改变整个灯电路阻抗的方式被切换。整个灯电路阻抗的改变将导致灯电流的变化。电流控制电路309-312的第二种工作方式是利用一个PWM信号按指定的工作循环连续地接通和切断电路。PWM302以比AC信号321的频率低得多的频率进行转换。典型地，AC 321会在50KHz的范围内。各个灯的PWM将以大约100赫兹到几千赫兹的频率范围内转换。为PWM设定较低的重复频率，目的是避免灯的可见闪烁。
PWM的工作循环将由电路的阻抗特性来确定。另外，电阻器317-320被用于感应通过各个灯的电流。321的次级电压的大小通过MCU 301中的嵌入代码来确定。电压感应电阻器322，323提供控制系统使用的必要的反馈，从而设定次级电压。该装置能够执行传统模拟控制器的所有功能。另外，该装置可以提供多个传感器输入和多个数字和模拟输出。这些模拟和数字输入和输出保证了通过该装置数字控制系统能够驱动背光系统。
方法
该操作方法的一个实施例表示在图4中。该控制过程400以一个加电条件开始401。在下一步中，系统检测标记条件。如果包含在固件中的标记被设定，它表明要执行制造测试。I/O 307能够设置该标记。如果制造测试被执行，则固件进而执行灯测试和灯亮度的校准。另外，几个额外的参数被输入到码中，用来确定背光系统的特定的特性。如果标记被重置或者如果制造测试被完成，则系统进而确定初始条件404。初始条件通过温度的初始测量和对应于当前温度和灯的种类的击穿电压的计算来确定。用于控制特定背光系统的校准值取自于非易失性存储器。
灯打开和操作程序411包含下列步骤：
a)作为初始化405的部分，倒相器时钟与LCD控制器时钟同步。
b)电流控制电路309-312被设定为额定值。
c)应用额定击穿电压使倒相器开始运作。
d)反馈被获得406。
e)检测灯408，校验是否所有的灯都已打开。
f)如果所有的灯仍没有打开，在执行过电压检测的407步，倒相器输出被增加。
g)一旦灯被打开，在409步，伺服控制被激活。灯电流，电压和光亮度被维持在按照伺服算法和反馈信号所确定的值。
h)在410步，灯参数被监视，以提供连续的反馈和恰当的动作。
i)伺服控制不断的活动。
校准的图解显示在图5中。该过程如下：
a)为一个灯设置倒相器为额定值。
b)一次打开一个灯。
c)为校准的目的自动地对电流电压和发出的光进行测量并且进行记录。
上述的装置和方法的其它实施例可以被应用于由其它种类的发光设备，诸如LEDs、EEFL光和等离子显示系统，组成的其它发光系统。

Claims (7)

1.一种用于显示系统的装置，该装置包括：
电流控制电路(309-312)，其被配置为控制流经灯(313-316)的电流；以及
倒相器(321)，其被配置为产生次级电压，所述倒相器包括与所述电流控制电路(309-312)相连的微控制器单元(301)，所述微控制器单元(301)包括：
模拟多路复用器(305)；
模数转换器(304)；以及
脉宽调制器(302)，其中所述电流控制电路(309-312)利用一个脉宽调制信号按指定的工作循环接通和切断。
2.根据权利要求1所述的装置，该装置还包括被配置为提供反馈以设定次级电压(321)的电压感应电阻器(322，323)。
3.根据权利要求1所述的装置，其中所述电流控制电路(309-312)在微控制器单元(301)的控制下以将改变整个灯电路阻抗的方式被切换，以改变灯电流。
4.一种显示系统中校准灯亮度的方法，该方法包含以下步骤：
为一个灯设置倒相器为额定电压；
以所述额定电压一次打开一个灯；以及
当每一个灯被打开时，用光感器测量照明度并用光亮度计测量实际的亮度值。
5.根据权利要求4所述的方法，其中所述灯是冷阴极荧光灯CCFL。
6.根据权利要求4所述的方法，其中所述灯是外置电极荧光灯EEFL。
7.根据权利要求4所述的方法，其中所述灯是发光二极管LED。
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WO2004072733A2 (en) 2004-08-26
MXPA05008423A (es) 2006-03-17
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EP1590716A2 (en) 2005-11-02
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US20060049959A1 (en) 2006-03-09

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