CN102930835A - 背光调光电路及背光调光方法 - Google Patents

背光调光电路及背光调光方法 Download PDF

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CN102930835A
CN102930835A CN2012104651695A CN201210465169A CN102930835A CN 102930835 A CN102930835 A CN 102930835A CN 2012104651695 A CN2012104651695 A CN 2012104651695A CN 201210465169 A CN201210465169 A CN 201210465169A CN 102930835 A CN102930835 A CN 102930835A
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杨翔
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TCL China Star Optoelectronics Technology Co Ltd
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Abstract

本发明涉及一种背光调光电路及背光调光方法。该背光调光电路包括:锁相环调光模块,其侦测3D同步信号的上升沿以产生多路与该3D同步信号同相位的3D模式的调光信号;相位延迟模块,其根据延迟设定值对该多路的3D模式的调光信号按路分时输出;外部调光模块,其接收外部调光信号以产生2D模式的调光信号;触发器,其接收该2D模式的调光信号以及该按路分时输出的多路的3D模式的调光信号并且根据2D/3D转换信号来决定输出该2D模式的调光信号或该按路分时输出的多路的3D模式的调光信号。本发明还提供了背光调光方法。本发明可以减少传输信号,从而减少信号传输途中被干扰的风险;可以采用集成设计,不需要过多的信息处理,成本降低。

Description

背光调光电路及背光调光方法
技术领域
本发明涉及液晶显示技术,尤其涉及一种背光调光电路及背光调光方法。
背景技术
随著LED电视快速发展,其即将进入另一个阶段——3D液晶电视。3D液晶电视中,有一种快门式(SHUTTER GLASS)3D显示技术是目前最普遍使用的技术,其利用背光分区闪烁,分开显示左右眼的信号,再搭配同步闪烁的眼镜,即可使左右眼看到不同的影像。快门式3D显示技术利用影像处理技术,使人眼感受如同立体影像一般的视觉效果,主要包括:使左、右眼图像帧(frame)信号交替输出至液晶面板,驱动液晶面板上分别形成左、右眼图像,配合扫描式背光模组(scanning BLU)的照射加上快门眼镜的时序控制,使左、右眼信号分别刺激左、右眼,从而使人感受3D图像。
在SHUTTER GLASS 3D显示技术中,通常需要时序控制器(TCON)将来自机芯板的2D、3D调光信息(同步时间,调光占空比(DUTY),2D/3D之间的转换指令)转换成串行外设接口(SPI)信号到微控制单元(MCU),MCU解码成LED驱动(DRIVER)可用的信号到LED驱动芯片(DRIVERIC),LED DRIVER IC再转换成对应的调光DUTY和电流给到LED。
现有背光调光技术的缺陷在于,方案复杂,在信号传输和处理过程中易受到杂讯干扰,且方案成本较高,因此亟需改进。
发明内容
因此,本发明的目的在于提供一种背光调光电路,减少传输信号,从而减少信号传输途中被干扰的风险。
本发明的另一目的在于提供一种背光调光方法,减少传输信号,从而减少信号传输途中被干扰的风险。
为实现上述目的,本发明提供一种背光调光电路,其包括:
锁相环调光模块,该锁相环调光模块侦测3D同步信号的上升沿以产生多路与该3D同步信号同相位的3D模式的调光信号,该锁相环调光模块还根据模拟调光电平决定3D模式下的占空比;
相位延迟模块,其接收来自该锁相环调光模块的多路的3D模式的调光信号,并根据延迟设定值对该多路的3D模式的调光信号按路分时输出;
外部调光模块,其接收外部调光信号以产生2D模式的调光信号;
触发器,其接收该2D模式的调光信号以及该按路分时输出的多路的3D模式的调光信号并且根据2D/3D转换信号来决定输出该2D模式的调光信号或该按路分时输出的多路的3D模式的调光信号。
其中,该锁相环调光模块为模拟锁相环或数字锁相环。
其中,该模拟锁相环包括相位参考提取电路、压控振荡器、相位比较器、控制电路,该模拟锁相环提取3D同步信号作为相位的参考信号,该压控振荡器具有三角波发生电路并与模拟调光电平比较产生一方波信号。
其中,该相位延迟模块包括可调的计数器,当该计数器计数到达设定的值时,开通对应路的传输通道。
其中,该相位延迟模块连接电容,该延迟设定值由该电容的值设定。
其中,该外部调光模块为运算放大器。
其中,该2D/3D转换信号为高低电平信号。
其中,该锁相环调光模块集成于LED驱动芯片中。
本发明还提供了一种背光调光方法,包括:
步骤1、使用锁相环调光模块侦测3D同步信号的上升沿以产生多路与该3D同步信号同相位的3D模式的调光信号,该锁相环调光模块还根据模拟调光电平决定3D模式下的占空比;
步骤2、使用相位延迟模块接收来自该锁相环调光模块的多路的3D模式的调光信号,并根据延迟设定值对该多路的3D模式的调光信号按路分时输出;
步骤3、使用外部调光模块接收外部调光信号以产生2D模式的调光信号;
步骤4、使用触发器接收该2D模式的调光信号以及该按路分时输出的多路的3D模式的调光信号并且根据2D/3D转换信号来决定输出该2D模式的调光信号或该按路分时输出的多路的3D模式的调光信号。
其中,该锁相环调光模块集成于LED驱动芯片中。
本发明的背光调光电路及背光调光方法可以减少传输信号,从而减少信号传输途中被干扰的风险;可以采用集成设计,不需要过多的信息处理,成本降低。
附图说明
下面结合附图,通过对本发明的具体实施方式详细描述,将使本发明的技术方案及其他有益效果显而易见。
附图中,
图1为本发明背光调光电路一较佳实施例的模块结构图;
图2为本发明背光调光方法一较佳实施例的流程图。
具体实施方式
参见图1,其为本发明背光调光电路一较佳实施例的模块结构图。该背光调光电路主要包括:
锁相环调光(PLL DIMMING)模块11,锁相环调光模块11侦测3D同步信号的上升沿以产生多路与该3D同步信号同相位的3D模式的调光(DIMMING)信号,锁相环调光模块11还根据模拟调光电平(DC DUTY)决定3D模式下的占空比;
相位延迟模块12,其接收来自锁相环调光模块11的多路的3D模式的调光信号,并根据延迟设定值(DEALY SET)对该多路的3D模式的调光信号按路分时输出;通过可调整的相位延迟模块12,将调光信号分时输出,实现3D扫描(SANNING)功能;
外部调光(EXT DIMMING)模块13,其接收外部调光(PDIM)信号以产生2D模式的调光信号,该外部调光信号可以接收自机芯板;外部调光模块13可以为内置于LED驱动芯片中的运算放大器,跟随PDIM信号即可;
触发器14,其接收该2D模式的调光信号以及该按路分时输出的多路的3D模式的调光信号并且根据2D/3D转换信号来决定输出该2D模式的调光信号或该按路分时输出的多路的3D模式的调光信号。输出的2D或3D模式的调光信号用于驱动液晶显示装置的LED背光。该2D/3D转换信号可以为高低电平信号,触发器14根据2D/3D转换信号来决定传输哪一路调光,例如,可以设置高电平为3D状态,低电平为2D状态。
2D/3D转换信号可以通过搭接的选择电路传输,从而可以在2D模式下屏蔽3D同步信号,3D同步信号一般为由机芯板提供的垂直同步(VSYNC)信号,使用来自机芯板的PDIM信号调光;在3D模式下下屏蔽PDIM信号,选择VSYNC信号。
锁相环调光模块11可以为模拟锁相环或数字锁相环。该模拟锁相环主要由相位参考提取电路、压控振荡器、相位比较器、控制电路等组成,该模拟锁相环提取3D同步信号作为相位的参考信号,该压控振荡器具有三角波发生电路并与模拟调光电平比较产生一方波信号。锁相环调光模块11可以集成于LED驱动芯片中,减少传输信号,从而减少信号传输途中被干扰的风险;集成设计,不需要过多的信息处理,成本降低。相位延迟模块12、外部调光模块13或触发器14也可以集成于LED驱动芯片中。
该相位延迟(PHASE DEALY)模块12里面可以是可调的一计数器,当该计数器计数到达设定的值时,开通对应路的传输通道(CH),多个传输通道(CH)以此类推。从而将调光信号分时输出,实现3D扫描(SANNING)功能。相位延迟模块12可以连接电容,该延迟设定值由该电容的值设定,也就是根据电容的值设定延迟(DELAY)的时间。
参见图2,其为本发明背光调光方法一较佳实施例的流程图。该背光调光方法主要包括:
步骤1、使用锁相环调光模块侦测3D同步信号的上升沿以产生多路与该3D同步信号同相位的3D模式的调光信号,该锁相环调光模块还根据模拟调光电平决定3D模式下的占空比;
步骤2、使用相位延迟模块接收来自该锁相环调光模块的多路的3D模式的调光信号,并根据延迟设定值对该多路的3D模式的调光信号按路分时输出;
步骤3、使用外部调光模块接收外部调光信号以产生2D模式的调光信号;
步骤4、使用触发器接收该2D模式的调光信号以及该按路分时输出的多路的3D模式的调光信号并且根据2D/3D转换信号来决定输出该2D模式的调光信号或该按路分时输出的多路的3D模式的调光信号。其中,该锁相环调光模块可以集成于LED驱动芯片中。
本发明的背光调光方法将锁相环(PLL)集成到LED驱动芯片中,通过锁相环模块侦测3D同步信号,根据3D同步信号产生同相位的调光信号,然后通过可调整的相位延迟模块将调光信号分时输出,从而实现3D扫描功能。另外可以通过搭接选择电路,在2D模式下屏蔽3D同步信号,使用机芯板的PDIM信号调光,在3D模式下屏蔽PDIM信号,选择3D同步信号。
综上所述,本发明的背光调光电路及背光调光方法可以减少传输信号,从而减少信号传输途中被干扰的风险;可以采用集成设计,不需要过多的信息处理,成本降低。
以上所述,对于本领域的普通技术人员来说,可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形,而所有这些改变和变形都应属于本发明后附的权利要求的保护范围。

Claims (10)

1.一种背光调光电路,其特征在于,包括:
锁相环调光模块,该锁相环调光模块侦测3D同步信号的上升沿以产生多路与该3D同步信号同相位的3D模式的调光信号,该锁相环调光模块还根据模拟调光电平决定3D模式下的占空比;
相位延迟模块,其接收来自该锁相环调光模块的多路的3D模式的调光信号,并根据延迟设定值对该多路的3D模式的调光信号按路分时输出;
外部调光模块,其接收外部调光信号以产生2D模式的调光信号;
触发器,其接收该2D模式的调光信号以及该按路分时输出的多路的3D模式的调光信号并且根据2D/3D转换信号来决定输出该2D模式的调光信号或该按路分时输出的多路的3D模式的调光信号。
2.如权利要求1所述的背光调光电路,其特征在于,该锁相环调光模块为模拟锁相环或数字锁相环。
3.如权利要求2所述的背光调光电路,其特征在于,该模拟锁相环包括相位参考提取电路、压控振荡器、相位比较器、控制电路,该模拟锁相环提取3D同步信号作为相位的参考信号,该压控振荡器具有三角波发生电路并与模拟调光电平比较产生一方波信号。
4.如权利要求1所述的背光调光电路,其特征在于,该相位延迟模块包括可调的计数器,当该计数器计数到达设定的值时,开通对应路的传输通道。
5.如权利要求1所述的背光调光电路,其特征在于,该相位延迟模块连接电容,该延迟设定值由该电容的值设定。
6.如权利要求1所述的背光调光电路,其特征在于,该外部调光模块为运算放大器。
7.如权利要求1所述的背光调光电路,其特征在于,该2D/3D转换信号为高低电平信号。
8.如权利要求1所述的背光调光电路,其特征在于,该锁相环调光模块集成于LED驱动芯片中。
9.一种背光调光方法,其特征在于,包括:
步骤1、使用锁相环调光模块侦测3D同步信号的上升沿以产生多路与该3D同步信号同相位的3D模式的调光信号,该锁相环调光模块还根据模拟调光电平决定3D模式下的占空比;
步骤2、使用相位延迟模块接收来自该锁相环调光模块的多路的3D模式的调光信号,并根据延迟设定值对该多路的3D模式的调光信号按路分时输出;
步骤3、使用外部调光模块接收外部调光信号以产生2D模式的调光信号;
步骤4、使用触发器接收该2D模式的调光信号以及该按路分时输出的多路的3D模式的调光信号并且根据2D/3D转换信号来决定输出该2D模式的调光信号或该按路分时输出的多路的3D模式的调光信号。
10.如权利要求9所述的背光调光方法,其特征在于,该锁相环调光模块集成于LED驱动芯片中。
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