CN110221478A - 一种背光模组及其制备方法、显示装置 - Google Patents

一种背光模组及其制备方法、显示装置 Download PDF

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CN110221478A
CN110221478A CN201910555557.4A CN201910555557A CN110221478A CN 110221478 A CN110221478 A CN 110221478A CN 201910555557 A CN201910555557 A CN 201910555557A CN 110221478 A CN110221478 A CN 110221478A
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backlight module
shell
circuit board
layer
guide plate
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田栋
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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 CN201910555557.4A priority Critical patent/CN110221478A/zh
Priority to US16/625,733 priority patent/US11256119B2/en
Priority to PCT/CN2019/101743 priority patent/WO2020258474A1/zh
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    • G02B6/0086—Positioning aspects
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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    • H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
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Abstract

本发明公开了一种背光模组及其制备方法、显示装置，所述背光模组包括外壳，所述外壳设有一通孔；柔性电路板，设于所述通孔内，其尺寸与所述通孔尺寸相适配。本发明的有益效果在于本发明的背光模组及其制备方法、显示装置将铁壳与柔性电路板进行了结合，采用一体化注塑成形技术将柔性电路板直接嵌入铁壳中，此项改进直接避免了铁壳为了容置柔性电路板厚度采取的凹槽设计，一方面减小了背光整体厚度，另一方面使背光反面变得平整，更利于后续组装。

Description

一种背光模组及其制备方法、显示装置
技术领域
本发明涉及背光领域，特别涉及一种背光模组及其制备方法、显示装置。
背景技术
全面屏已成为手机显示的主流发展方向。全面屏显示追求超窄边框，随着窄边框显示屏的普及，要求背光的边框进一步减窄。
背光模组为液晶显示器的重要组件之一，由于液晶本身不发光，背光模组的功能就是供应充足的亮度与分布均匀的光源，使液晶显示器能正常显示影像。目前，液晶显示器的显示技术已经趋于成熟，尤其在背光模组的设计方面也有了很大的发展。背光模组除了应用在液晶显示器、液晶电视机等液晶显示装置之外，还可以为数码相框、电子纸、手机等显示装置提供光源。
现阶段，为了实现背光下端窄边框，通常运用L/B反组技术，如图1所示，铁壳下端设置有一个容置凹槽，用来放置反向组装的柔性电路板，LED灯位于柔性电路板上，高度与导光板一致，反射片位于导光板下方，同样用胶带固定在铁壳凹槽上。在柔性电路板设计中，为了使LED灯的高度与导光板对齐，铁壳需设计成台阶状，凹槽用来容置柔性电路板的厚度。L/B反组设计有效减小了背光下端边框，但铁壳台阶状的设计带来两个问题，一是增加了背光厚度，且背光反面有突起，挤占了整机组装的空间，二是背光反面不平整会对其与玻璃的组装产生影响，需要特殊的平台治具来应对。
发明内容
解决上述问题的技术方案是：本发明提供了一种背光模组，包括外壳，所述外壳设有一通孔；柔性电路板，设于所述通孔内，其尺寸与所述通孔尺寸相适配。
进一步的，所述外壳包括一水平壳体和与所述水平壳体垂直的竖直壳体，其中，所述通孔设于所述水平壳体靠近所述竖直壳体一侧。
进一步的，所述背光模组还包括光源，设于所述电路板上；导光板，具有入光侧和出光侧，所述入光侧位于所述导光板的侧面，所述出光侧垂直于所述入光侧，所述导光板设于所述外壳内，所述出光侧远离所述外壳；所述光源位于所述导光板的入光侧且与所述导光板同高；反射片，设于所述导光板与所述外壳之间；扩散片，设于所述导光板的出光侧；光学膜片，设于所述扩散片远离所述导光板一侧。
进一步的，所述电路板包括基底，设于所述通孔远离所述光源一侧；导电层，设于所述基底上；保护层，设于所述导电层远离所述基底一侧，其中，所述基板与所述导电层之间设于第一导电胶层，所述导电层与所述保护层之间设有第二导电胶层。
进一步的，所述基板和所述保护层的材料均为聚酰亚胺。
进一步的，所述导电层的材料为铜。
进一步的，所述外壳为金属材质。
本发明还提供了一种背光模组的制备方法，包括冲压形成外壳，在冲压成型前预留一通孔；在所述通孔处形成柔性电路板，其中所述电路板与所述通孔尺寸相适配。
进一步的，所述电路板的制备步骤包括与所述外壳一体化注塑形成基底；在所述基底上涂布一层第一导电胶；在所述第一导电胶上镀上一层金属层，并在所述金属层上刻蚀电路结构形成导电层；在所述导电层上涂布一层第二导电胶；在所述第二导电胶上覆盖一层保护层。
本发明还提供了一种显示装置，包括所述背光模组。
本发明的优点是：本发明的背光模组及其制备方法、显示装置将铁壳与柔性电路板进行了结合，采用一体化注塑成形技术将柔性电路板直接嵌入铁壳中，此项改进直接避免了铁壳为了容置柔性电路板厚度采取的凹槽设计，一方面减小了背光整体厚度，另一方面使背光反面变得平整，更利于后续组装。
附图说明
下面结合附图和实施例对本发明作进一步解释。
图1是背景技术中的背光模组示意图。
图2是实施例中的背光模组示意图。
图3是实施例中的柔性电路板示意图。
图4是实施例中的显示装置示意图。
图中
1显示装置； 10背光模组；
100外壳； 200柔性电路板；
300光源； 400导光板；
500反射片； 600扩散片；
700光学膜片； 110水平壳体；
120竖直壳体； 401出光侧；
402入光侧； 101通孔；
210基底； 220导电层；
230保护层； 201第一导电胶；
具体实施方式
以下实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「顶」、「底」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
实施例
如图2所示，本实施例中，本发明的背光模组10包括外壳100、柔性电路板200、光源300、导光板400、反射片500、扩散片600和光学膜片700。
如图4所示，所述背光模组10用于给显示装置1提供均匀、柔和的光源，用以使所述显示装置1显示画面，所述显示装置1可以为：手机、平板电脑等具有显示功能的产品或部件，包括所述背光模组10。
所述外壳100为金属外壳，一般为铁壳，其具有较强的耐压耐磨能力，且成本较低，本实施例中，所述外壳100包括一水平壳体110和垂直于所述水平壳体110的竖直壳体120。
本实施例中，所述背光模组10采用侧光式，所述光源300设于所述水平壳体110靠近所述竖直壳体120一侧，其一般为LED发光二极管，将电能转换为光能用以提供所述背光模组10所需的光能。
如图3所示，所述柔性电路板200设于所述光源300与所述水平壳体110之间，用以提供所述光源300所需的电能，具体的，所述柔性电路板200包括基底210、导电层220和保护层230。
所述基底210的材料为聚酰亚胺材料，用以承接所述导电层220，所述导电层220为电镀铜板，其上刻有若干电路走线，所述保护层230设于所述导电层220上，其所用材料为聚酰亚胺材料，用以保护所述导电层220，防止其被水氧腐蚀，同时所述聚酰亚胺材料为绝缘材料，有效防止所述导电层220出现短路现象。
所述导光板400设于所述水平壳体110上，其具有出光侧401和入光侧402，其中，所述入光侧402在所述导光板400的侧面且正对所述光源300，所述出光侧401垂直于所述入光侧402且背对所述水平壳体110，为了保证所述光源300发出的光线能够最大程度的通过所述导光板400发散出去，通常所述光源300远离所述水平壳体110的一侧与所述导光板400的出光侧401需要保持同一高度，但由于所述光源300与所述水平壳体110之间还设有所述柔性电路板200，为了保证所述导光板的高度，现有技术中，通常采用将所述水平壳体110设计为台阶状，但这种方法是所述外壳100的加工变得复杂，增加了制作成本，同时会增加后续组装的难度。
本实施例中，采用在所述水平壳体110靠近所述竖直壳体120的一侧开设有通孔101，所述通孔101的尺寸与所述柔性电路板200的尺寸相适配，方便所述柔性电路板200可以完全嵌入所述通孔101中，减小了所述背光模组10的厚度，且由于所述柔性电路板200嵌入所述通孔中，所述导光板400可以直接设于所述水平壳体110上，无需采用台阶状水平壳体以确保所述导光板400的所述出光侧401的高度。
所述反射片500设于所述导光板400与所述水平壳体110之间，用以将所述光源300通过所述入光侧402射进的偏向所述水平壳体110方向的光线反射至所述出光侧401一侧，提高所述背光模组10的发光效率，增加所述显示装置的画面质量。
所述扩散片600设于所述导光板400出光侧401一侧，所述扩散片600用以提高经由所述出光侧401射出的光线的扩散效果，使其分布更加均匀，柔和，同时也可以提高光线的透过率。
所述光学膜片700设于所述扩散片600远离所述导光板400一侧，所述光学膜片700的形状包括棱镜、扩散膜等，用以提高所述背光模组10的光学性能。
为了更好的解释本发明，本实施例还提供了一种背光模组10的制备方法，包括
冲压形成外壳100，在冲压成型前预留一通孔101；在所述通孔101处形成柔性电路板200，其中所述柔性电路板200与所述通孔101的尺寸相适配。
具体的，所述柔性电路板的制备方法如下：
在所述通孔处101注塑形成一基底210；
在所述基底210上涂布一层第一导电胶201；
在所述第一导电胶201上镀上一层金属层，并通过刻蚀的方式在所述金属层上刻蚀电路结构形成导电层220；
在所述导电层220上涂布一层第二导电胶202；
在所述第二导电层上覆盖一层保护层230。本实施例中，通过将所述柔性电路板200的成型工艺分解开，通过将所述柔性电路板200的基底210与所述外壳100形成一体避免所述柔性电路板200与所述外壳100的组装偏差，有利于提高所述背光模组10的组装精度。
以上仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内所作的任何修改、等同替换和改进等，均应包含在本发明的保护范围之内。

Claims (10)

1.一种背光模组，其特征在于，包括
外壳，所述外壳设有一通孔；
柔性电路板，设于所述通孔内，其尺寸与所述通孔尺寸相适配。
2.根据权利要求1所述的背光模组，其特征在于，
所述外壳包括一水平壳体和与所述水平壳体垂直的竖直壳体，其中，所述通孔设于所述水平壳体靠近所述竖直壳体一侧。
3.根据权利要求2所述的背光模组，其特征在于，还包括
光源，设于所述电路板上；
导光板，具有入光侧和出光侧，所述入光侧位于所述导光板的侧面，所述出光侧垂直于所述入光侧，所述导光板设于所述外壳内，所述出光侧远离所述外壳；所述光源位于所述导光板的入光侧且与所述导光板同高；
反射片，设于所述导光板与所述外壳之间；
扩散片，设于所述导光板的出光侧；
光学膜片，设于所述扩散片远离所述导光板一侧。
4.根据权利要求3所述的背光模组，其特征在于，
所述电路板包括
基底，设于所述通孔远离所述光源一侧；
导电层，设于所述基底上；
保护层，设于所述导电层远离所述基底一侧，其中，所述基板与所述导电层之间设于第一导电胶层，所述导电层与所述保护层之间设有第二导电胶层。
5.根据权利要求4所述的背光模组，其特征在于，
所述基板和所述保护层的材料均为聚酰亚胺。
6.根据权利要求4所述的背光模组，其特征在于，
所述导电层的材料为铜。
7.根据权利要求1所述的背光模组，其特征在于，
所述外壳为金属材质。
8.一种背光模组的制备方法，其特征在于，包括
冲压形成外壳，在冲压成型前预留一通孔；
在所述通孔处形成柔性电路板，其中所述电路板与所述通孔尺寸相适配。
9.根据权利要求8所述的背光模组的制备方法，其特征在于，
所述电路板的制备步骤包括
与所述外壳一体化注塑形成基底；
在所述基底上涂布一层第一导电胶；
在所述第一导电胶上镀上一层金属层，并在所述金属层上刻蚀电路结构形成导电层；
在所述导电层上涂布一层第二导电胶；
在所述第二导电胶上覆盖一层保护层。
10.一种显示装置，其特征在于，包括如权利要求1-7中任意一项所述的背光模组。
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