CN101725915B - 背光模组 - Google Patents
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Abstract
本发明提供一种背光模组,包括光源、导光板与增光膜,所述导光板具有入射面及一个出射面,所述入射面与光源相对,所述背光模组还包括转动驱动装置,所述增光膜为环形柔性薄膜,其具有相对的第一增亮部与第二增亮部,所述第一增亮部与第二增亮部分别位于所述导光板两侧,其中,第一增亮部位于所述导光板的出射面的一侧或所述导光板的与所述出射面相对的面的一侧,所述转动驱动装置与环形增光膜相连接,转动驱动装置可带动增光膜绕所述导光板转动从而可使第一增亮部或第二增亮部与所述出射面相对。从而,该背光模组可根据使用者的需要调节其亮度与视角范围。
Description
技术领域
本发明涉及一种光源装置,尤其涉及一种应用于液晶显示器的背光模组。
背景技术
目前,发光二极管(Light emitting Diode,LED)因具体积小,效率高,寿命长等优点而逐渐取代现有冷阴极荧光灯(Cold Cathode Fluorecent Lamp,CCFL)作为背光模组的发光单元,以节省电能,从而减少能源的浪费。具体可参阅Michael S.Shur等人在文献Proceedings of the IEEE,Vol.93,No.10(2005年10月)中发表的“Solid-State Lighting:Toward Superior Illumination”一文。
如图6所示,一种现有的背光模组410,包括光源411、导光板412、反射板413、扩散板414、增光膜415以及框架416。光源411、导光板412、反射板413、扩散板414与增光膜415均固设于框架416内。光源411位于导光板412两侧的入射面4121。导光板412还具有底面4122与出射面4123。反射板413位于与底面4122相对的一侧,反射板413用于将导光板412的底面4122漏出的光反射回导光板412,以提高光源的利用率。增光膜415位于与出射面4123相对的一侧,用于聚拢光线以提高背光模组410垂指方向的辉度值。扩散板414用于使出射的光线更加均匀,其中一块扩散板414设置于导光板412与增光膜415之间,另一块扩散板414位于增光膜415的另一侧。然而,由于现有的增光膜415为了聚拢光线,增加显示亮度,光线仅能以固定亮度在一个狭窄的区域内出射(通常为90度)。当该背光模组410作为背光照明应用于液晶显示装置时,该显示装置同样由于光线出射角度狭窄,使得两侧的观察者不能看清液晶显示器显示的画面,其视角较为狭窄,无法满足宽视角的使用需求。
因此,有必要提供一种视角范围可调、亮度可改变的背光模组。
发明内容
下面将以具体实施例说明一种视角范围可调、亮度可改变的背光模组。
一种背光模组,包括光源、导光板与增光膜,所述导光板具有入射面及一个出射面,所述入射面与光源相对,所述背光模组还包括转动驱动装置,所述增光膜为环形柔性薄膜,其具有相对的第一增亮部与第二增亮部,所述第一增亮部与第二增亮部分别位于所述导光板两侧,其中,第一增亮部位于所述导光板的出射面的一侧或所述导光板的与所述出射面相对的面的一侧,所述转动驱动装置与环形增光膜相连接,转动驱动装置可带动增光膜绕所述导光板转动从而可使第一增亮部或第二增亮部与所述出射面相对。
一种增光膜,包括第一增亮部、第二增亮部以及连接于第一增亮部与第二增亮部两端的两连接部,第一增亮部与第二增亮部相对,用以改变从第一增亮部或第二增亮部出射的光的亮度,两连接部连接第一增亮部与第二增亮部以形成环形增光膜使环形增光膜具有一内部空间,第一增亮部与第二增亮部在两连接部间的宽度距离相等,第一增亮部与第二增亮部在两连接部间的宽度距离大于连接部在第一增亮部与第二增亮部间的宽度距离。
一种利用上所述的增光膜制作的背光模组,包括位于环形增光膜内部空间的导光板、光源以及转动驱动装置,导光板具有入射面和一出射面,入射面与光源相对,出射面与增光膜的第一增亮部或第二增亮部相对,转动驱动装置用于与环形增光膜相连接以带动环形增光膜绕导光板转动。
相对于现有技术,本技术方案的背光模组利用四个轮子带动增光膜转动以使第一增亮部或第二增亮部与所述出射面相对,使得背光模组的的辉度值即亮度可改变,并使其视角范围改变,从而可根据使用者的需要调节不同的亮度与视角范围。本技术方案的增光膜包括可改变从第一增亮部或第二增亮部出射的光的亮度,从而使得该增光膜的应用更方便,适用范围更广。
附图说明
图1是本技术方案第一实施例提供的背光模组的第一状态示意图。
图2是本技术方案第一实施例提供的背光模组的第二状态示意图。
图3是图2的光学模组沿III-III方向的剖视图。
图4是本技术方案第二实施例提供的背光模组的示意图。
图5是本技术方案第三实施例提供的背光模组的示意图。
图6是现有技术的背光模组的示意图。
具体实施方式
下面将结合附图与多个实施例对本技术方案的背光模组作进一步详细说明。
请一并参阅图1至图3,本技术方案第一实施例提供的背光模组100,包括框架10、光源20、导光板30、反射板40、扩散板50、增光膜60、转动驱动装置70。本实施例中,扩散板50包括第一扩散板51和第二扩散板52,转动驱动装置70包括轮子71和马达72,转动驱动装置70可带动增光膜60转动。
框架10包括相连的内框架12与外框架14。反射板40、导光板30、第一扩散板51依次固定于内框架12。光源20与导光板30相对设置,其可固定于内框架12,也可固定于外框架14,本实施例中,光源20固定于内框架12。第二扩散板52和马达72固定于外框架14。至少一个轮子71可转动的安装于内框架12且其一端与马达72相连以驱动其转动。另外还可直接将至少一个轮子71安装于马达72的输出轴上。增光膜60由轮子71支撑,可随轮子71同步转动。
导光板30具有与光源20相对的入射面31、一个底面32以及一个与该底面32相对的出射面33。该入射面31连接该底面32及该出射面33。光源20向背光模组100提供光。优选地,该光源20可为发光二极管。导光板30可将光源20的线光源转化为面光源再出射。光源20发出的光线经入射面31进入到导光板30,部分光线直接经由出射面33出射,另一部分光线则会经由底面32漏出。
反射板40位于与导光板30的底面32相对的一侧。反射板40用于将经由底面32漏出而照射到反射板40的光线反射回导光板30,再经由导光板30的出射面33出射。反射板40为全反射反射板,可有效提高光线利用效率。
扩散板50位于与导光板30的出射面33相对的一侧。其中,第一扩散板51位与导光板30与增光膜60之间。第一扩散板51用于将经由导光板30的出射面33出射的光线转换成均匀分布的光。第二扩散板52位于增光膜60外侧,其较第一扩散板51远离导光板30。第二扩散板52用于经由增光膜60出射的光线转换成均匀分布的光,使得最终出射的光更加均匀。
增光膜60为透明性非常好的聚对苯二甲酸乙二酯,其表面具有丙烯酸树脂,经精密成型一层均一的图案的光学薄膜,其可具有较好之柔性与拉伸强度。增光膜60具有相对的第一增亮部61与第二增亮部62。所述光源20、导光板30、反射板40以及靠近导光板30的第一块扩散板50均位于第一增亮部61与第二增亮部62之间。另一块扩散板50位于增光膜60的外侧。
第一增亮部61与第二增亮部62的两端均具有连接部63,从而,增光膜60近似为一首尾相接的链条状结构,即,增光膜60为一封闭环形结构。导光板30、第一扩散板51和反射板40位于增光膜60的封闭环形内,第一扩散板51位于导光板30的出射面33相对的一侧,反射板40位于导光板30的底面32相对的一侧。两连接部63连接第一增亮部61与第二增亮部62以形成环形增光膜60使环形增光膜60具有一内部空间。第一增亮部61与第二增亮部62在两连接部63间的宽度距离相等,第一增亮部61与第二增亮部62在两连接部63间的宽度距离大于连接部63在第一增亮部61与第二增亮部62间的宽度距离。第一增亮部61与第二增亮部62的宽度略大于导光板30沿两个光源20连线方向的宽度。连接部63在第一增亮部61与第二增亮部62间的宽度距离略大于导光板30的厚度,且连接部63的宽度远小于第一增亮部61和第二增亮部62的宽度。
第一增亮部61的集光度大于第二增亮部62的集光度,即第一增亮部61的增亮效果比第二增亮部62的增亮效果好。同时,由于第一增亮部61的集光度较大,其聚光程度较大,即将光线聚集到一个较小的范围内,从而第一增亮部61所形成的视角范围小于第二增亮部62形成的视角范围。
具体地,如图1所示,第一增亮部61可具有微棱镜结构,当其位于与出射面33相对一侧时,其可有效聚拢光线,使得最终出射的光线辉度值提升,亮度增加。同时,由于第一增亮部61的微棱镜结构可将光线聚拢起来,使得光的出射角度范围变窄,其视角范围较为狭窄。
如图2所示,第二增亮部62为平面结构,当其位于与出射面33相对一侧时,其聚拢光线效果较差,最终出射的光线辉度值也较低,亮度较低。但由于第二增亮部62的光线聚拢程度不高,因而其光线的出射角度范围较宽,其视角范围也相对较宽。
轮子71位于第一增亮部61、第二增亮部62部与连接部63连接处且与增光膜60压紧接触。轮子71用于带动增光膜60转动以使第一增亮部61和第二增亮部62交替位于与导光板30出射面相对的一侧。从而可使第一增亮部61或第二增亮部62与所述出射面33相对。轮子71为圆柱体形,其数量至少为两个。其中,至少一个轮子71为驱动轮,其由马达72驱动。当轮子71的数量为两个时,其分别与增光膜60两侧的连接部63压紧接触即可带动增光膜60转动。本实施例中,轮子71的数量为四个,且四个轮子71均为驱动轮,其同步转动时可增大驱动力,以带动环形增光膜60同步转动。
请参阅图3,马达72与轮子71连接配合,用于驱动轮子71转动。马达72的数量至少为一个,以驱动至少一个轮子71转动。优选地,马达72的数量为四个,以同步驱动四个轮子71同向转动。马达72同步驱动轮子71时,由于轮子71与增光膜60在四个转角处压紧接触,轮子71可利用自身与增光膜60间的摩擦力带动增光膜60同步转动。从而,转动驱动装置70带动增光膜60转动时,第一增亮部61与第二增亮部62可交替位于导光板30的出射面相对的一侧,实现增亮效果与视角范围的改变。
本实施例的背光模组100可实现显示装置的亮度与视角范围的改变,以满足了使用者不同情况下的使用需求。
请参阅图4,本技术方案第二实施例提供的背光模组200与第一实施例提供的背光模组100大致相同,其不同之处在于:增光膜260的第二增亮部262也具有微棱镜结构,其微棱镜结构的顶角大于第一增亮部261的微棱镜结构的顶角。第二增亮部262的聚光能力小于第一增亮部261的聚光能力。即,第二增亮部262的集光度小于第一增亮部261的集光度,但其视角范围比第一增亮部261的视角范围大。
请参阅图5,本技术方案第三实施例提供的背光模组300与第一实施例提供的背光模组100大致相同,其不同之处在于:背光模组300包括多个光源320,导光板330具有相对的入射面332与出射面333。多个光源320设置于与导光板330的入射面332相对的一侧。
当然,上述导光板的形状既可为方形,也可为楔形,其并不影响本技术方案的实施。另外,所述第一增亮部与第二增亮部也可为其它具有增亮效果的结构,仅需第一增亮部与第二增亮部的集光度与视角范围不同即可。
相对于现有技术,本技术方案的背光模组利用四个轮子带动增光膜转动以使第一增亮部或第二增亮部与所述出射面相对,使得背光模组的的辉度值即亮度可改变,并使其视角范围改变,从而可根据使用者的需要调节不同的亮度与视角范围。
可以理解的是,对于本领域的普通技术人员来说,可以根据本技术方案的技术构思做出其它各种相应的改变与变形,而所有这些改变与变形都应属于本技术方案权利要求的保护范围。
Claims (10)
1.一种背光模组,包括光源、导光板与增光膜,所述导光板具有入射面及一个出射面,所述入射面与光源相对,其特征在于,所述背光模组还包括转动驱动装置,所述增光膜为环形柔性薄膜,其具有相对的第一增亮部与第二增亮部,所述第一增亮部与第二增亮部分别位于所述导光板两侧,其中,第一增亮部位于所述导光板的出射面的一侧或所述导光板的与所述出射面相对的面的一侧,所述转动驱动装置与环形增光膜相连接,转动驱动装置可带动增光膜绕所述导光板转动从而可使第一增亮部或第二增亮部与所述出射面相对。
2.如权利要求1所述的背光模组,其特征在于,所述转动驱动装置包括至少两个轮子和马达,所述轮子与所述环形增光膜压紧接触,所述至少一个轮子与马达相连,从而马达可驱动该与马达相连的轮子转动以带动增光膜转动。
3.如权利要求2所述的背光模组,其特征在于,所述背光模组还包括框架,框架包括相连的内框架和外框架,光源与导光板依次固定于内框架,马达固定于外框架。
4.如权利要求1所述的背光模组,其特征在于,所述第一增亮部的集光度大于第二增亮部的集光度,第一增亮部的视角范围小于第二增亮部的视角范围。
5.如权利要求4所述的背光模组,其特征在于,所述第一增亮部与第二增亮部均具有微棱镜结构,第一增亮部的微棱镜结构的集光度大于第二增亮部的微棱镜结构的集光度。
6.如权利要求1所述的背光模组,其特征在于,所述第一增亮部具有微棱镜结构,第二增亮部为平面结构。
7.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第一扩散板和第二扩散板,第一扩散板位于导光板与增光膜之间且位于导光板出射面相对的一侧,第二扩散板位于增光膜外侧。
8.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反射板,导光板具有与出射面相对的底面,反射板位于导光板与增光膜之间且位于导光板的底面相对的一侧,反射板为全反射反射板。
9.一种增光膜,包括第一增亮部、第二增亮部以及连接于第一增亮部与第二增亮部两端的两连接部,第一增亮部与第二增亮部相对,用以改变从第一增亮部或第二增亮部出射的光的亮度,两连接部连接第一增亮部与第二增亮部以形成环形增光膜使环形增光膜具有一内部空间,第一增亮部与第二增亮部在两连接部间的宽度距离相等,第一增亮部与第二增亮部在两连接部间的宽度距离大于连接部在第一增亮部与第二增亮部间的宽度距离。
10.一种利用如权利要求9所述的增光膜制作的背光模组,包括位于环形增光膜内部空间的导光板、光源以及转动驱动装置,导光板具有入射面和一出射面,入射面与光源相对,出射面与增光膜的第一增亮部或第二增亮部相对,转动驱动装置用于与环形增光膜相连接以带动环形增光膜绕导光板转动。
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CN102705784B (zh) * | 2012-06-06 | 2015-11-25 | 深圳市华星光电技术有限公司 | 一种光学组件定位结构、液晶显示装置及其制作方法 |
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