CN100542372C - 带自动亮度调节电路的逆变器控制器 - Google Patents
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Abstract
本发明给出了一种用于LCD屏显示器的带自动亮度调节电路的逆变器控制器。在一个示范性实施例中,该控制器包括一个接收表示LCD屏背景光信号的查找表,该查找表产生一个与期望屏幕亮度相对应的信号。该与期望屏幕亮度相对应的信号在常规型反馈逆变器电路中被用作一个门限信号,该常规型反馈逆变器电路给LCD屏上的灯管供电。在另一个示范性实施例中给出了一种主控制器,该主控制器包括一个光传感器控制器,该光传感器控制器查询一个从光传感器从而产生一个表示LCD屏背景光的信号。
Description
技术领域
本发明涉及一种液晶显示背光电源逆变器控制器,更具体的涉及一种包括自动亮度调节电路的逆变器控制器。本发明通常应用在例如便携式电脑和便携式电子器件上的LCD屏显示器,和/或单LCD屏显示器和/或电视机显示屏上。
背景技术
图1所示为一种带一个常规LCD屏显示器52的常规计算机系统10。其中的一个逆变器控制器150用来驱动一个或多个冷阴极荧光灯(CCFL)38a和/或38b,该控制器包括一个变压器152和一个逆变器控制器154,这些都是为本领域所熟知的。一个光传感器156用来产生一个显示屏52的背景光信号。该计算机系统还包括一种常规系统CPU158。在该常规系统中,光传感器和逆变器控制器是由系统CPU通过信号线和数据线101、102和103、104分别控制的。通常,这些信号线代表数据和/或时钟信号,并能控制相应的设备。光传感器是根据LCD屏背景光来有效的设置屏幕亮度。但是,图1所示的电路中需要系统CPU带宽和系统CPU与控制器150之间的独立布线。因此,在实现屏幕亮度控制的同时仍存在一种需求,即消除对系统CPU带宽和额外布线的需求。
发明内容
从而,在本发明的一个示范性实施例中给出了一种用于LCD屏显示器的主/从式亮度控制器,该控制器包括:一个产生一个表示LCD屏背景光信号的光传感器;一个控制所述光传感器从而产生所述表示所述LCD屏背景光的信号的,不需要与主机系统CPU之间通信的微控制器;一个接收表示所述LCD屏背景光的信号的查找表,所述查找表能根据表示所述LCD屏背景光的信号,从多个目标屏幕亮度等级信号中挑出一个选定等级信号;能够产生脉冲模式信号的低频PWM电路,所述脉冲模式信号具有基于所述目标屏幕亮度等级信号的脉宽,和一个接收多个目标屏幕亮度等级信号中的一个信号,从而控制输送给所述LCD屏的功率的,不需要与主机系统CPU之间通信的逆变器电路。
值得本领域的技术人员重视的是,虽然下面的详细描述是基于给出的较佳实施例,但是本发明并不仅仅局限于这些实施例。反而,本发明涉及范围广泛,其范围仅由相应权利要求限定。
本发明的其他特征和优点将在下面的详细描述过程中得到充分体现,详细描述中请参照附图及其相关数据、元件标号。
附图说明
图1所示为一个便携式电脑的逆变器控制器系统的系统框图;
图2所示为本发明的一个示范性逆变器控制器的框图,该逆变器控制器包括自动亮度调节电路;
图3所示为本发明的一个示范性主模式逆变器控制器的系统框图;
图4所示为本发明的一个示范性主/从式逆变器控制器的框图,该主/从式逆变器控制器包括自动亮度调节电路。
具体实施方式
图2所示为本发明的一个示范性逆变器控制器系统100的框图,该逆变器控制器系统包括自动亮度调节电路。通常,本发明的控制器100包括调节LCD屏亮度的板上电路,其与系统CPU之间不需要信号线。一个示范性实施例中控制器100包括一个光传感器12和一个产生一个表示可程式化亮度等级信号的查找表(LUT)26。更有优势的是,本发明包括能控制LCD屏幕亮度但不需要与计算机系统CPU之间通信的电路,这种通信在常规亮度调节模块中是必需的。
如上所述,光传感器12监视LCD屏工作环境的背景光,并输出一个表示当前背景光总量(或一定比例)的信号13。在该示范性实施例中给出了一个模数转换器(A/D)24,其根据输入信号13产生多个二进制信号25。如图所示四个二进制信号能产生16个亮度等级,本领域的技术人员都知道可以通过增加或减小A/D转换器的位元深度(bitdepth)来达到一个期望的分辨率。查找表(LUT)26接收表示背景光的二进制数并为LCD屏产生一个目标/期望亮度。例如,LUT包括多个代表二进制输入数值的列和相应的代表屏幕期望/目标亮度的列。目标屏幕亮度值的设定可以基于线性分割(也就是说由模数A/D转换器的位元深度(bit depth)确定的平均分割)、加权分割、对数分割等。本示范性实施例所示的LUT为四个数字输入和一个数字输出,尽管如此,该LUT可以依据实际应用适应任何数量的输入和/或输出。这种构造是为本领域的技术人员熟知的。当然,LUT的实现还有多种方式,上述描述只代表一个示范性实施例。
LUT26的输出信号为一个期望/目标屏幕亮度信号。可选择的是D/A转换器28可把LUT26的输出转换为一个模拟信号,尽管如果逆变器电路能接收预先设置的数字信号,则D/A转换器可以被省略。在任何情况下,目标屏幕亮度信号是用作逆变器的一个控制信号,例如闭环反馈系统中的调节屏幕中灯管的功率(亮度)的门限值。图2所示的示范性实施例中,功率调节(例如减光)是通过采用本领域技术人员熟知的常规脉冲模式减光技术(burst mode dimming techniques)来完成的。
在本实施例中,目标亮度信号是低频脉宽调制PWM信号发生器30的输入,该发生器产生一个脉冲模式信号来调节屏幕灯管的功率。利用脉冲模式技术给多灯管供电的方式已在转让给同一受让人的美国专利No.6,501,234中披露,并在此引作参考。本质上,目标亮度信号设置由低频脉宽调制PWM信号发生器30产生的脉冲模式信号的脉冲宽度。低频脉宽调制PWM信号发生器30还包括一个用户优先开关(user override switch)32,该开关不考虑目标亮度信号的值,而是把亮度设置为用户定义的值。
然后,逆变器电路34利用发生器30产生的脉冲模式信号,把一个直流DC信号转换为一个交流AC信号。变压器36把该交流AC信号升高到一个足够高的电压来点亮灯管38并使灯管38工作于稳定状态。逆变器电路包括一个全桥式(4个开关)、半桥式(2个开关)、Royer式、推挽式、Class-D式和其它形式的本领域技术人员熟知的逆变器电路。
图2所示的实施例中,逆变器基本上响应光传感器产生的信号,并且消除了控制器100与系统CPU之间布线的需要,因此,所述逆变器还适用于独立于主机系统CPU来控制输送给所述LCD屏的功率。图3的实施例中给出了一种主模式控制器电路,与图2不同的是,其包括一个作为控制光传感器的主控制器的逆变器控制器。
参考图3,根据本发明的另一个示范性实施例,一个便携式计算机系统10’带有一种主模式自动亮度控制器200。该控制器200包括一个逆变器控制器202、一个光传感器12和一个变压器36,该控制器能控制一个或多个CCFL灯管38a和/或38b。本实施例的逆变器控制器202包括一个直接查询光传感器12从而请求背景光环境相关信息的电路。因此,控制器202为主动设备,而光传感器12为从动设备。本实施例也消除了控制器200与系统CPU50之间的通信布线轨迹(例如,通信信道54和56)。因此,控制器202为主动设备,而光传感器12为由主动设备控制的从动设备。
图4所示为一个根据图3的主从式实施例的示范性控制器202。除给出了一个光传感器微控制器204,该控制器202与图2所示的控制器100相似。该微控制器能产生一个触发光传感器的控制信号206,例如,从而使光传感器检测LCD屏的背景光(例如,查询光传感器)。如上所述,背景光信号208依次经微控制器204处理,接着用在查找表LUT26和逆变器电路34中。微控制器204包括一个在预先设定或用产自定义的时间间隔查询光传感器的电路。
因此,本发明给出了一种用于LCD屏的主模式自动亮度控制器。本领域的技术人员将认识到对本发明的多种改进。例如,图2和图4所示的脉冲模式减光技术可以被相位位移技术和/或其它为本领域熟知的减光技术所代替;转让给同一受让人的美国专利No.6,396,722披露了一种上述相位位移技术,在此引作参考。在该实例中,查找表LUT产生的目标亮度信号可以用作为一个参考信号来适当调整逆变器开关的相位,从而产生期望的亮度等级。另外,在多灯管情况下本领域技术人员已经知道,查找表LUT能产生多个目标亮度信号,每一个信号用在每个灯管的逆变器上。查找表LUT可以采用有一个输入输出表的寄存器或EEPROM设备构建而成。当然,也可以用处理器来代替LUT,但是,这样会增加该设备的总成本。
上述这些或其它改进对本领域的技术人员来说都是显而易见的,所有的这些改进都认为是在本发明的精神范围之内,都受限于本发明的权利要求。
Claims (5)
1、一种用于LCD屏显示器的主/从式亮度控制器,其特征在于:所述亮度控制器包括:
一个产生一个表示所述LCD屏背景光的信号的光传感器;
一个控制所述光传感器从而产生所述表示所述LCD屏背景光的信号的,不需要与主机系统CPU之间通信的微控制器;
一个接收表示所述LCD屏背景光的信号的查找表,所述查找表能根据表示所述LCD屏背景光的信号,从多个目标屏幕亮度等级信号中挑出一个选定等级信号;
能够产生脉冲模式信号的低频PWM电路,所述脉冲模式信号具有基于所述目标屏幕亮度等级信号的脉宽,和
一个接收多个目标屏幕亮度等级信号中的一个信号,从而控制输送给所述LCD屏的功率的,不需要与主机系统CPU之间通信的逆变器电路。
2、根据权利要求1所述的用于LCD屏显示器的主/从式亮度控制器,进一步包括一个数模A/D转换器电路,所述数模A/D转换器电路接受所述表示所述LCD屏背景光的信号并产生一个期望位元深度的数字信号。
3、根据权利要求1所述的用于LCD屏显示器的主/从式亮度控制器,其特征在于:所述逆变器电路可从包括全桥式、半桥式、推挽式、Royer式和Class D式的逆变器电路组中选出。
4、根据权利要求1所述的用于LCD屏显示器的主/从式亮度控制器,所述LCD屏包括多个接收至少一个所述逆变器电路的功率的灯管。
5、根据权利要求1所述的用于LCD屏显示器的主/从式亮度控制器,其特征在于:所述查找表包括一个有输入值和相应输出值的寄存器,所述输入值由所述表示LCD屏背景光的信号表示,所述输出值由所述多个目标屏幕亮度等级信号表示。
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Application Number | Priority Date | Filing Date | Title |
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US10/360,412 US7095392B2 (en) | 2003-02-07 | 2003-02-07 | Inverter controller with automatic brightness adjustment circuitry |
US10/360,412 | 2003-02-07 |
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CN100542372C true CN100542372C (zh) | 2009-09-16 |
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- 2003-10-22 CN CNB2003101028699A patent/CN100542372C/zh not_active Expired - Fee Related
- 2003-10-22 CN CNU2003201039222U patent/CN2735494Y/zh not_active Expired - Lifetime
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2004
- 2004-02-06 JP JP2004031303A patent/JP2004273440A/ja active Pending
- 2004-02-06 TW TW093102784A patent/TWI318763B/zh not_active IP Right Cessation
- 2004-12-02 HK HK04109564.3A patent/HK1066683A1/xx not_active IP Right Cessation
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2006
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TWI318763B (en) | 2009-12-21 |
CN2735494Y (zh) | 2005-10-19 |
US20060279521A1 (en) | 2006-12-14 |
CN1520243A (zh) | 2004-08-11 |
TW200425039A (en) | 2004-11-16 |
HK1066683A1 (en) | 2005-03-24 |
JP2004273440A (ja) | 2004-09-30 |
US20040155853A1 (en) | 2004-08-12 |
US7095392B2 (en) | 2006-08-22 |
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