CN105176437B - 背光源灯条胶 - Google Patents

背光源灯条胶 Download PDF

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CN105176437B
CN105176437B CN201510639245.3A CN201510639245A CN105176437B CN 105176437 B CN105176437 B CN 105176437B CN 201510639245 A CN201510639245 A CN 201510639245A CN 105176437 B CN105176437 B CN 105176437B
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lamp bar
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CN105176437A (zh
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张起
孟德宇
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BOE Technology Group Co Ltd
BOE Optical Science and Technology Co Ltd
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Priority to US15/327,863 priority patent/US10267982B2/en
Priority to PCT/CN2016/073619 priority patent/WO2017054388A1/zh
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Abstract

本发明提供了一种背光源灯条胶带，包括：透明粘合材料层(110)，用于粘贴灯条柔性电路板的表面；黑白柔性涂布层(120)，一侧为黑色，一侧为白色，黑白柔性涂布层(120)的白色面(120W)与透明粘合材料层(110)粘合；以及黑白粘合材料层(130)，一侧为黑色，一侧为白色，其黑色面(130B)与黑白柔性涂布层(120)的黑色面(120B)粘合。本发明还提供一种包括如上所述灯条胶带的背光模组以及包括所述背光模组的显示装置。根据本发明的背光源灯条胶带能够消除背光源入光侧亮带和热斑(Hot Spot)现象。

Description

背光源灯条胶
技术领域
本发明涉及灯条胶，更具体地，涉及一种用于消除背光源入光侧亮带和热斑(HotSpot)现象的灯条胶。
背景技术
目前，智能手机背光单元(BLU)尺寸的发展趋势为“窄”“薄”“亮”。智能手机背光源光条胶(Light bar)所用发光二极管(LED)为侧面发光，入光距离处于[1.5mm，3.0mm]的范围内。LED发光面高约0.5mm，宽约3.0mm，即，近似估计单颗LED光源为点光源(LED在导光板中垂直照射，光强度和光亮度相等)，根据点光源照度公式：
其中为光通量，ω为立体角，I为发光强度，R为光源至导光板(LGP)的距离。从上述公式可以得出：点光源照射到某一面积所产生的光照度与光源的发光强度成正比，与光源到受照面积的距离平方成反比。不可避免地产生背光源入光侧亮带和Hot Spot现象。
单纯通过导光板网点以及V-CUT改善，背光源入光侧的亮带改善效果不明显。单独使用黑色“回”字形灯条胶背光源平均辉度会降低10％左右，导致光学规格不能达到目前市场要求的典型值。另外，背光源入光侧按压会使背光源平均辉度再降低3～5％。
发明内容
本发明提供了一种灯条胶带，包括：透明粘合材料层，用于粘贴灯条柔性电路板的表面；黑白柔性涂布层，一侧为黑色，一侧为白色，所述黑白柔性涂布层的白色面与所述透明粘合材料层粘合；以及黑白粘合材料层，一侧为黑色，一侧为白色，其黑色面与所述黑白柔性涂布层的黑色面粘合。
根据本发明的实施例，所述黑白柔性涂布层由透明基材和分别涂布于所述透明基材两侧的黑色涂布颗粒和白色涂布颗粒构成，黑色涂布颗粒构成其黑色面，白色涂布颗粒构成其白色面。
根据本发明的实施例，所述白色涂布颗粒的半径大于所述黑色涂布颗粒的半径。优选地，所述白色涂布颗粒的半径为所述黑色涂布颗粒的半径的两倍。
根据本发明的实施例，所述透明基材可以由聚对苯二甲酸乙二醇酯(PET)制成，所述透明基材的厚度在0.014mm和0.024mm之间。
根据本发明的实施例，所述白色涂布颗粒的半径为0.002mm，所述黑色涂布颗粒的半径为0.001mm。
根据本发明的实施例，所述黑白柔性涂布层的厚度可以在0.015mm和0.025mm之间。
根据本发明的实施例，所述透明粘合材料层的厚度可以在0.02mm和0.04mm之间。
根据本发明的实施例，所述黑白粘合材料层的厚度可以在0.02mm和0.04mm之间。
根据本发明的实施例，所述黑白柔性涂布层可以比所述黑白粘合材料层宽1.0mm至3.0mm。
根据本发明的实施例，所述灯条胶带的宽度可以在2.0mm和6.0mm之间，所述灯条胶带的厚度可以在0.055mm和0.105mm之间。
根据本发明的实施例，所述白色涂布颗粒和所述黑色涂布颗粒由聚甲基丙烯酸甲酯和树脂的混合物制成。
根据本发明的实施例，所述黑白粘合材料层的白色面粘贴发光二极管(LED)，所述黑白柔性涂布层的黑色涂布颗粒面覆盖导光板喇叭口斜面部分。
根据本发明，灯条胶伸出的黑白柔性涂布层中，例如伸出1.0mm至3.0mm，黑色面和LGP喇叭口斜面可实现无缝接触，可做到降低背光源灯前非有效光亮度，最终起到消除背光源灯前亮带的作用。另一方面，灯条胶贴附在灯条柔性电路板后，LED发光面前为白胶面，保证了LED光源光效不变，最终保证了背光源整体光学辉度的稳定。
优化地，在黑白柔性涂布层中，白色涂布颗粒的半径大于黑色涂布颗粒的半径，优选白色涂布颗粒的半径为黑色涂布颗粒的半径的两倍，由此，根据斯涅耳定律最终增大了背光源入光侧出光角度，起到增大背光源入光侧雾化效果，可消除背光源入光侧的热斑(Hot Spot)现象。
本发明实施例还提供一种背光模组，包括：光源；与光源邻接的导光板，所述导光板具有喇叭口斜面部分；和如前所述的灯条胶带，所述灯条胶带的黑色粘合材料层的白色面粘贴所述光源，所述黑白柔性涂布层的部分黑色涂布颗粒面覆盖导光板的喇叭口斜面部分。
本发明实施例还提供一种显示装置，包括如上所述的背光模组。
附图说明
通过下面结合附图说明本发明的优选实施例，将使本发明的上述及其它目的、特征和优点更加清楚，其中：
图1A是示出了本发明实施例的灯条胶分层结构的示意图；
图1B是用于说明本发明实施例所采用的黑白柔性涂布层对入射光的散射作用的示意图；
图2是示出了本发明实施例的灯条胶的使用场景的示意图；以及
图3是示出了本发明实施例的灯条胶的正面投影的示意图。
在本发明的所有附图中，相同或相似的结构均以相同或相似的附图标记标识。另外，本发明的附图仅为示意目的，并非按比例绘制。
具体实施方式
下面参照附图对本发明的优选实施例进行详细说明，在描述过程中省略了对于本发明来说是不必要的细节和功能，以防止对本发明的理解造成混淆。以下，以本发明应用于发光二极管(LED)的场景为例，对本发明进行了详细描述。但本发明并不局限于此，本发明也可以应用于其他合适的背光光源，如激光二极管(LD)等。
图1A是示出了本发明实施例的灯条胶分层结构的示意图。如图1所示，根据本发明实施例的灯条胶包括：透明双面胶110(透明粘合材料层)，用于粘贴灯条柔性电路板(参考图2)的表面；黑白柔性涂布层120，一侧为黑色，一侧为白色，黑白柔性涂布层120的白色面与透明双面胶110粘合；以及黑白双面胶130(黑白粘合材料层)，一侧为黑色130B，一侧为白色130W，其黑色面130B与黑白柔性涂布层120的黑色面粘合。
在一实施例中，黑白柔性涂布层由透明基材120S和分别涂布于透明基材120S两侧的黑色涂布颗粒120B和白色涂布颗粒120W构成，黑色涂布颗粒120B构成黑白柔性涂布层的黑色面，白色涂布颗粒120W构成黑白柔性涂布层的白色面。应该指出的是，黑色涂布颗粒和白色涂布颗粒可以采用材料涂布领域中常用的材料制成，例如由聚甲基丙烯酸甲酯(PMMA)和树脂的混合物制成。
透明基材120S可以由厚度在0.014mm和0.024mm之间的聚对苯二甲酸乙二醇酯(PET)制成。
白色涂布颗粒120W的半径大于黑色涂布颗粒120B的半径。优选地，白色涂布颗粒120W的半径是黑色涂布颗粒120B的半径的两倍，例如，白色涂布颗粒的半径为0.002mm，黑色涂布颗粒的半径为0.001mm。参考用于说明本发明实施例所采用的黑白柔性涂布层120对入射光的散射作用的图1B，根据斯涅耳定律，即，光的折射定律nBsinθIN＝nWsinθOUT(其中，黑色涂布颗粒层的折射率nB大于白色涂布颗粒层的折射率nW，即nB＞nW)，入射光(例如，参考图2，来自LED 200发光面的光线)的入射角θIN小于出射光(折射光)的出射角θOUT，即，θIN＜θOUT，最终增大了背光源入光侧出光角度，起到增大背光源入光侧雾化效果，可消除背光源入光侧的热斑(Hot Spot)现象。
黑白柔性涂布层120的总厚度可以在0.015mm和0.025mm之间。
透明粘合材料层110的厚度可以在0.02mm和0.04mm之间。黑白粘合材料层130的厚度可以在0.02mm和0.04mm之间。
由此，灯条胶带的总厚度可以在0.055mm和0.105mm之间。
另外，黑白柔性涂布层120比透明双面胶110和黑白粘合材料层130宽1.0mm至3.0mm。灯条胶带的总宽度在2.0mm和6.0mm之间。
图2是示出了本发明实施例的灯条胶的使用场景的示意图。如图2所示，灯条胶的透明双面胶110粘贴于灯条柔性电路板10的表面，黑白双面胶130的白色面130W粘贴发光二极管(LED)200，黑白柔性涂布层120的黑色涂布颗粒面120B覆盖导光板(LGP)300的喇叭口斜面部分。灯条胶伸出1.0mm至3.0mm的黑白柔性涂布层120，黑色面120B和LGP300的喇叭口斜面可实现无缝接触，可做到降低背光源灯前非有效光亮度，最终起到消除背光源灯前亮带的作用。另一方面，灯条胶贴附在灯条柔性电路板10后，LED 200发光面前为白胶面130W，保证了LED 200光源光效不变，最终保证了背光源整体光学辉度的稳定。
图3是示出了本发明实施例的灯条胶的正面投影的示意图。LED颗粒200粘贴于黑白双面胶130的白色面130W；黑白柔性涂布层120的黑色涂布颗粒面120B比黑白粘合材料层130宽1.0mm至3.0mm，用于覆盖导光板(LGP)300的喇叭口斜面部分。
根据本发明，在黑白柔性涂布层中，白色涂布颗粒的半径为黑色涂布颗粒的半径的两倍，根据斯涅耳定律最终增大了背光源入光侧出光角度，起到增大背光源入光侧雾化效果，可消除背光源入光侧的热斑(Hot Spot)现象。此外，灯条胶伸出1.0mm至3.0mm的黑白柔性涂布层，黑色面和LGP喇叭口斜面可实现无缝接触，可做到降低背光源灯前非有效光亮度，最终起到消除背光源灯前亮带的作用。另一方面，灯条胶贴附在灯条柔性电路板后，LED发光面前为白胶面，保证了LED光源光效不变，最终保证了背光源整体光学辉度的稳定。
另外，本发明实施例还提供一种背光模组，包括：光源；与光源邻接的导光板，所述导光板具有喇叭口斜面部分，例如如图2所示；和如前所述的灯条胶带，所述灯条胶带的黑色粘合材料层的白色面粘贴所述光源，所述黑白柔性涂布层的部分黑色涂布颗粒面覆盖导光板的喇叭口斜面部分。
本发明实施例还提供一种显示装置，包括如上所述的背光模组。
至此已经结合优选实施例对本发明进行了描述。应该理解，本领域技术人员在不脱离本发明的精神和范围的情况下，可以进行各种其它的改变、替换和添加。因此，本发明的范围不局限于上述特定实施例，而应由所附权利要求所限定。

Claims (12)

1.一种灯条胶带，包括：
透明粘合材料层，用于粘贴灯条柔性电路板的表面；
黑白柔性涂布层，一侧为黑色，一侧为白色，其白色面与所述透明粘合材料层粘合；以及
黑白粘合材料层，一侧为黑色，一侧为白色，其黑色面与所述黑白柔性涂布层的黑色面粘合，
其中所述黑白柔性涂布层由透明基材和分别涂布于所述透明基材两侧的黑色涂布颗粒和白色涂布颗粒构成，黑色涂布颗粒构成其黑色面，白色涂布颗粒构成其白色面；
所述白色涂布颗粒的半径大于所述黑色涂布颗粒的半径；并且
所述白色涂布颗粒和所述黑色涂布颗粒由聚甲基丙烯酸甲酯和树脂的混合物制成。
2.根据权利要求1所述的灯条胶带，其中所述白色涂布颗粒的半径是所述黑色涂布颗粒的半径的两倍。
3.根据权利要求1或2所述的灯条胶带，其中所述透明基材由聚对苯二甲酸乙二醇酯制成，所述透明基材的厚度在0.014mm和0.024mm之间。
4.根据权利要求1或2所述的灯条胶带，其中所述白色涂布颗粒的半径为0.002mm，所述黑色涂布颗粒的半径为0.001mm。
5.根据权利要求1或2所述的灯条胶带，其中所述黑白柔性涂布层的厚度在0.015mm和0.025mm之间。
6.根据权利要求1或2所述的灯条胶带，其中所述透明粘合材料层的厚度在0.02mm和0.04mm之间。
7.根据权利要求1或2所述的灯条胶带，其中所述黑白粘合材料层的厚度在0.02mm和0.04mm之间。
8.根据权利要求1或2所述的灯条胶带，其中所述黑白柔性涂布层比所述黑白粘合材料层宽1.0mm至3.0mm。
9.根据权利要求1或2所述的灯条胶带，其中所述灯条胶带的宽度在2.0mm和6.0mm之间，所述灯条胶带的厚度在0.055mm和0.105mm之间。
10.根据权利要求1或2所述的灯条胶带，其中所述黑白粘合材料层的白色面粘贴发光二极管(LED)，所述黑白柔性涂布层的部分黑色涂布颗粒面覆盖导光板喇叭口斜面部分。
11.一种背光模组，包括：
光源；
与光源邻接的导光板，所述导光板具有喇叭口斜面部分；
如前述权利要求1-9中任一项所述的灯条胶带，所述灯条胶带的黑色粘合材料层的白色面粘贴所述光源，所述黑白柔性涂布层的部分黑色涂布颗粒面覆盖导光板的喇叭口斜面部分。
12.一种显示装置，包括如权利要求11所述的背光模组。
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