CN105572968A - 一种背光模组、液晶显示装置及其背光调节方法 - Google Patents

一种背光模组、液晶显示装置及其背光调节方法 Download PDF

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CN105572968A
CN105572968A CN201510969996.1A CN201510969996A CN105572968A CN 105572968 A CN105572968 A CN 105572968A CN 201510969996 A CN201510969996 A CN 201510969996A CN 105572968 A CN105572968 A CN 105572968A
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led
liquid crystal
adjustable resistance
backlight module
colour temperature
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郭星灵
熊彬
李曼
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to CN201510969996.1A priority Critical patent/CN105572968A/zh
Priority to US14/909,109 priority patent/US10146088B2/en
Priority to PCT/CN2016/070917 priority patent/WO2017107269A1/zh
Publication of CN105572968A publication Critical patent/CN105572968A/zh
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    • 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
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Abstract

本发明提供了一种背光模组、液晶显示装置及其背光调节方法；所述背光模组包括导光板和设于所述导光板的入光侧的LED灯条，所述LED灯条包括驱动芯片、若干至少两种不同色温的交错排列的LED灯，相同色温的所述LED灯依次串联构成一支路，并且每一支路串联一有个可调电阻，若干个LED灯构成的支路并联后均与所述驱动芯片相连构成驱动电路，所述背光模组还包括控制模块，所述控制模块与所述驱动电路连接。所述液晶显示装置的背光调节方法包括：确定所述液晶显示装置待显示的色温及白点色坐标；所述控制模块根据所述待显示的色温及白点色坐标，调节所述每一支路的所述可调电阻改变该支路通过所述LED灯的电流值。

Description

一种背光模组、液晶显示装置及其背光调节方法
技术领域
本发明涉及液晶显示领域，尤其涉及一种背光模组、液晶显示装置及其背光调节方法。
背景技术
采用RGBW像素排列的液晶面板架构，RGB在CF基板是由相应色阻充当，而白色W则是由透明的填平材料OC充当。液晶面板显示的红绿蓝这三种颜色的效果分别由RGB三种色阻和背光来决定，液晶面板显示的白色的效果就分两种条件决定，一种是红绿蓝色阻+背光，一种是OC+背光。液晶面板的NTSC(色域)和液晶面板的色温及白点色坐标是产品设计中重要的考量因素。然而红绿蓝色阻+背光的色温及白点却不等于OC+背光的色温及白点，导致设计生产出来的液晶面板的色温与一开始设计的色温相差很大，造成色温及白点色坐标漂移的情况。使设计出来的液晶面板色彩表现不达标，色温差异大。
发明内容
本发明实施例提供一种背光模组及液晶显示装置，实现使液晶面板的色温和白点色坐标精确可调的目的。
本发明还提供一种及背光调节方法。
为了实现上述目的，本发明实施方式提供如下技术方案：
本发明提供一种背光模组，所述背光模组包括导光板和设于所述导光板的入光侧的LED灯条，所述LED灯条包括驱动芯片、若干至少两种不同色温的间隔排列的LED灯，相同色温的所述LED灯依次串联构成一支路，并且每一支路串联一个可调电阻，若干个LED灯构成的支路并联后均与所述驱动芯片相连构成驱动电路，所述背光模组还包括控制模块，所述控制模块与所述驱动电路连接。
其中，所述LED灯具有两种色温，所述LED灯包括第一LED灯和第二LED灯，所述第一LED灯和所述第二LED灯交错排列，所述第一LED灯的色温高于所述第二LED灯的色温；所述可调电阻包括第一可调电阻和第二可调电阻，所述第一可调电阻与若干所述第一LED灯串联构成第一支路，所述第二可调电阻与若干所述第二LED灯串联构成第二支路。
其中，所述第一LED灯与所述第二LED灯涂覆相同厚度不同浓度或者相同浓度不同厚度的荧光粉。
其中，所述背光模组还包括棱镜片、扩散板和反射片，所述棱镜片、扩散片、导光板和反射片依次层叠设置，并且所述棱镜片、扩散片位于导光板出光方向。
本发明还提供一种液晶显示装置，所述液晶显示装置包括背光模组和液晶面板，所述液晶面板与所述背光模组层叠设置；
所述背光模组包括导光板和设于所述导光板的入光侧的LED灯条，所述LED灯条包括驱动芯片、若干至少两种不同色温的交错排列的LED灯，相同色温的所述LED灯依次串联构成一支路，并且每一支路串联一有个可调电阻，若干个LED灯构成的支路并联后均与所述驱动芯片相连构成驱动电路，所述背光模组还包括控制模块，所述控制模块与所述驱动电路连接。
其中，所述LED灯具有两种色温，所述LED灯包括第一LED灯和第二LED灯，所述第一LED灯的色温高于所述第二LED灯的色温；所述可调电阻包括第一可调电阻和第二可调电阻，所述第一可调电阻与若干所述第一LED灯串联构成第一支路，所述第二可调电阻与若干所述第二LED灯串联构成第二支路。
本发明还提供一种液晶显示装置的背光调节方法，所述液晶显示装置的背光调节方法包括：
确定所述液晶显示装置待显示的色温及白点色坐标；
所述控制模块根据所述待显示的色温及白点色坐标，调节所述每一支路的所述可调电阻改变该支路通过所述LED灯的电流值。
其中，调低所述第一可调电阻的阻值，并调高所述第二可调电阻的阻值来提高所述液晶显示装置的色温以及降低白点色坐标的漂移。
其中，调高所述第一可调电阻的阻值，并调低所述第二可调电阻的阻值来降低所述液晶显示装置的色温以及降低白点色坐标的漂移。
本发明的一种背光模组、液晶显示装置及其背光调节方法，通过交叉布置不同色温的LED光源，并在LED光源电路中串联可变电阻并设定电阻限流的方式，控制不同色温LED搭配比例，实现液晶面板的色温和白点色坐标精确可调。
附图说明
为了更清楚地说明本发明的技术方案，下面将对实施方式中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施方式，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是本发明实施例提供的背光模组的纵向截面示意图；
图2是图1所述的背光模组的横向截面示意图；
图3是图1所述的背光模组的LED灯条的驱动电路原理图；
图4是本发明实施例提供的液晶显示装置的背光调节方法得流程示意图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请一并参阅图1和图2，本发明实施方式提供一种背光模组100，所述背光模组100包括棱镜片10、扩散片20、导光板30、反射片40和一条LED灯条60。所述棱镜片10、扩散片20、导光板30和反射片40依次层叠设置。并且所述棱镜片10、扩散片20位于所述导光板30的出光方向。所述LED灯条60正对所述导光板30的侧向。
请一并参阅图2和图3，进一步的，所述LED灯条60包括一基板69和至少两种不同色温的LED灯61、驱动芯片62和若干可调电阻。所述LED灯61的个数为8至12个。所述不同色温的LED灯61在所述基板69上间隔排列。相同色温的所述LED灯61依次串联构成一支路，每一支路串联一个所述可调电阻，所述每一支路并联后与所述驱动芯片62相连构成驱动电路。所述背光模组还包括控制模块(图未示)，所述控制模块与所述驱动电路连接。所述控制模块可控制所述驱动电路中所述可调电阻的阻值变化。
在本实施例中，所述LED灯61分为两种色温，所述LED灯61包括第一LED灯611和第二LED灯612。所述第一LED灯611的色温高于所述第二LED灯612的色温。所述第一LED灯611和第二LED灯612的色温的不同可通过涂覆浓度相同但厚度不同的荧光粉或者浓度不同但厚度相同的荧光粉来实现。具体地，当所述第一LED灯611和第二LED灯612具有浓度相同但厚度不同的荧光粉时，所述第一LED灯611的荧光粉厚度小于所述第二LED灯612的荧光粉厚度；当所述第一LED灯611和第二LED灯612具有浓度不同但厚度相同的荧光粉时，所述第一LED灯611的荧光粉浓度小于所述第二LED灯612的荧光粉浓度。
请再次参见图2，进一步的，所述第一LED灯611和第二LED灯612在所述基板上交错排列。在本实施例中，所述第一LED灯611的个数为四个，所述第二LED灯612的个数为四个。四个所述第一LED灯611串联构成第一支路66，四个所述第二LED灯612串联构成第二支路67。
进一步的，所述可调电阻包括第一可调电阻631和第二可调电阻632。所述第一可调电阻631与四个所述第一LED灯611串联在所述第一支路66。所述第二可调电阻632与四个所述第二LED灯612串联在所述第二支路67。所述第一支路66与所述第二支路67并联后与所述驱动芯片62相连构成驱动电路70。所述驱动电路70可以调节所述背光模组100的色温。
本发明还提供一种液晶显示装置，所述液晶显示装置包括所述背光模组100和液晶面板，所述背光模组100与所述液晶面板层叠设置，。所述液晶显示装置的色温和白点色坐标可以通过所述背光模组100的驱动电路调节。
请参阅图4，本发明还提供了一种以上所述的液晶显示装置的背光调节方法，以实现液晶显示装置的色温和白点色坐标可调。所述液晶显示装置的背光调节方法包括：
步骤S1，确定所述液晶显示装置待显示的色温及白点色坐标；
步骤S2，所述控制模块根据所述待显示的色温及白点色坐标，调节所述每一支路的所述可调电阻改变该支路通过所述LED灯61的电流值。
当待显示的所述液晶显示装置的色温偏低并且白点色坐标漂移较大时，调低所述第一可调电阻631的阻值，从而提高通过所述第一LED灯611的电流值；同时调高所述第二可调电阻632的阻值，从而降低通过所述第二LED灯612的电流值。进而使所述液晶显示装置的整体色温偏向所述第一LED灯611的色温，即高色温，来提高所述液晶显示装置的色温以及降低白点色坐标的漂移。
当待显示的所述液晶显示装置的色温偏高并且白点色坐标漂移较大时，调高所述第一可调电阻631的阻值，从而降低通过所述第一LED灯611的电流值；同时调低所述第二可调电阻632的阻值，从而提高通过所述第二LED灯612的电流值。进而使所述液晶显示装置的整体色温偏向所述第二LED灯612的色温，即低色温，来降低所述液晶显示装置的色温以及降低白点色坐标的漂移。
在驱动电路里面串联所述可调电阻，可以通过电阻精确微调限流的方式，控制所述LED灯61的驱动电流，从而精确调节所述LED灯61的亮度，使所述液晶显示装置的色温以及白点色坐标可实现精确调节。
以上所述是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也视为本发明的保护范围。

Claims (9)

1.一种背光模组，其特征在于，所述背光模组包括导光板和设于所述导光板的入光侧的LED灯条，所述LED灯条包括驱动芯片、若干至少两种不同色温的间隔排列的LED灯，相同色温的所述LED灯依次串联构成一支路，并且每一支路串联一个可调电阻，若干个LED灯构成的支路并联后均与所述驱动芯片相连构成驱动电路，所述背光模组还包括控制模块，所述控制模块与所述驱动电路连接。
2.如权利要求1所述的背光模组，其特征在于，所述LED灯具有两种色温，所述LED灯包括第一LED灯和第二LED灯，所述第一LED灯和所述第二LED灯交错排列，所述第一LED灯的色温高于所述第二LED灯的色温；所述可调电阻包括第一可调电阻和第二可调电阻，所述第一可调电阻与若干所述第一LED灯串联构成第一支路，所述第二可调电阻与若干所述第二LED灯串联构成第二支路。
3.如权利要求2所述的背光模组，其特征在于，所述第一LED灯与所述第二LED灯涂覆相同厚度不同浓度或者相同浓度不同厚度的荧光粉。
4.如权利要求1所述的背光模组，其特征在于，所述背光模组还包括棱镜片、扩散板和反射片，所述棱镜片、扩散片、导光板和反射片依次层叠设置，并且所述棱镜片、扩散片位于导光板出光方向。
5.一种液晶显示装置，其特征在于，所述液晶显示装置包括背光模组和液晶面板，所述液晶面板与所述背光模组层叠设置；
所述背光模组包括导光板和设于所述导光板的入光侧的LED灯条，所述LED灯条包括驱动芯片、若干至少两种不同色温的交错排列的LED灯，相同色温的所述LED灯依次串联构成一支路，并且每一支路串联一有个可调电阻，若干个LED灯构成的支路并联后均与所述驱动芯片相连构成驱动电路，所述背光模组还包括控制模块，所述控制模块与所述驱动电路连接。
6.如权利要求5所述的液晶显示装置，其特征在于，所述LED灯具有两种色温，所述LED灯包括第一LED灯和第二LED灯，所述第一LED灯的色温高于所述第二LED灯的色温；所述可调电阻包括第一可调电阻和第二可调电阻，所述第一可调电阻与若干所述第一LED灯串联构成第一支路，所述第二可调电阻与若干所述第二LED灯串联构成第二支路。
7.一种液晶显示装置的背光调节方法，其特征在于，所述液晶显示装置的背光调节方法包括：
确定所述液晶显示装置待显示的色温及白点色坐标；
所述控制模块根据所述待显示的色温及白点色坐标，调节所述每一支路的所述可调电阻改变该支路通过所述LED灯的电流值。
8.如权利要求7所述液晶显示装置的背光调节方法，其特征在于，调低所述第一可调电阻的阻值，并调高所述第二可调电阻的阻值来提高所述液晶显示装置的色温以及降低白点色坐标的漂移。
9.如权利要求7所述液晶显示装置的背光调节方法，其特征在于，调高所述第一可调电阻的阻值，并调低所述第二可调电阻的阻值来降低所述液晶显示装置的色温以及降低白点色坐标的漂移。
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