WO2014180103A1 - 反射膜、背光模组和显示装置 - Google Patents

反射膜、背光模组和显示装置 Download PDF

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Publication number
WO2014180103A1
WO2014180103A1 PCT/CN2013/086751 CN2013086751W WO2014180103A1 WO 2014180103 A1 WO2014180103 A1 WO 2014180103A1 CN 2013086751 W CN2013086751 W CN 2013086751W WO 2014180103 A1 WO2014180103 A1 WO 2014180103A1
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Prior art keywords
reflective film
low
reflective
led
reflectivity
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Ceased
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PCT/CN2013/086751
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English (en)
French (fr)
Inventor
康亚玲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BOE Technology Group Co Ltd
Hefei BOE Display Lighting Co Ltd
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BOE Technology Group Co Ltd
Hefei BOE Display Lighting Co Ltd
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Priority to US14/235,995 priority Critical patent/US9618679B2/en
Publication of WO2014180103A1 publication Critical patent/WO2014180103A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • Embodiments of the present invention relate to the field of display technologies, and in particular, to a reflective film, a backlight module, and a display device. Background technique
  • the current reflective film is applied in the field of display device backlight modules, mainly utilizing the high reflection of the reflective film to achieve efficient use of light.
  • the structure of the existing reflective film mainly includes three layers. As shown in FIG. 1 , from top to bottom, there are a reflective layer 101, a PET (Poly Ethylene Terephthalate) layer 102 and a back coating layer 103. Three stacked. When used in a backlight module, the reflective film can be attached to the reflective surface of the light guide plate of the backlight module. However, in a backlight module in the form of a side-entry light source, there is a certain spacing between adjacent LEDs on the light bar.
  • the reflected light on the reflecting surface directly in front of each LED is the strongest, and the reflected light on the reflecting surface corresponding to the area between two adjacent LEDs is weak, so that the reflecting surface appears.
  • the alternating light and dark appearance of the upper light side appears, which shows the hot spots common in the industry, thereby reducing the display quality of the display device.
  • Embodiments of the present invention provide a reflective film, a side of the surface of the reflective film is provided with a column of i ⁇ dots, and the low reflective dot area has a lower reflectivity than the reflective film of the LED light bar located at the side of the array of dots. The reflectivity of other areas of the surface to the incident light of the LED strip.
  • the row of low reflection dots is disposed in parallel with the LED strip.
  • the number of the low reflection dots is equal to the number of LEDs in the LED strip, and one low reflection dot is located directly in front of the corresponding LED.
  • the low reflection dot is a groove, or a protrusion, or a coating of low reflectivity material formed on the surface of the reflective film; the reflectivity of the low reflectivity material to the incident light of the LED strip is smaller than other areas of the surface of the reflective film The reflectivity of the incident light to the LED strip.
  • the shape of the meandering reflection dot is a circle, or a triangle, or a polygon.
  • Embodiments of the present invention also provide a backlight module including a light guide plate disposed on the light guide plate An LED strip on the light incident side, and a reflective film disposed on the reflective surface of the light guide plate, wherein the reflective film is the reflective film according to any one of the above.
  • Embodiments of the present invention further provide a display device comprising the backlight module described above.
  • FIG. 1 is a schematic structural view of a reflective film in the prior art
  • FIG. 2 is a schematic view showing the relative position of a reflective film and a backlight in the embodiment of the present invention.
  • 101 reflective layer
  • 102 PET layer
  • 103 back coating
  • 1 reflective film
  • 2 ⁇ shot dot
  • 3 LED strip.
  • the embodiment provides a reflective film, which is mainly used in a backlight module of a display device, and is disposed with reference to a position of a light source of the backlight module.
  • the reflective film 1 is provided with a row of low-reflection dots 2 on the side of the surface edge of the existing reflective film structure.
  • the area corresponding to the low-reflection dot 2 corresponds to the reflectance of the incident light of the LED strip 3 on the side of the low-reflection dot of the column.
  • the reflectance of the incident light of the LED strip 3 is smaller than that of other areas of the surface of the reflective film 1.
  • the LED light bar 3 emits light onto the reflective film 1 on the front side thereof.
  • the reflectance of the light can be reduced, and the brightness ratio of the area can be avoided.
  • the brightness of other areas is large, which reduces or eliminates the phenomenon of alternating light and dark on the light side of the LED light bar.
  • the row of low-reflection dots 2 are disposed in parallel with the LED strips 3, so that the low-reflection dots 2 have a uniform reducing effect on the incident light reflectance of the LED strips on the light-in side.
  • the number of the low reflection dots 2 may be equal to the number of LEDs in the LED strip 3, each low reflection net Point 2 is located directly in front of its corresponding LED. Because on the light-in side of the LED light bar, among the light emitted by each LED, the brightness of the light directly in front of the LED is the largest, and the spot 2 is placed directly in front of the LED, which can effectively reduce the incident light reflection on the light-in side of the LED light bar. Rate, avoid the appearance of alternating light and dark.
  • the number of low-reflection dots 2 is smaller than the number of LEDs in the LED strip 3, and each low-reflection dot 2 is located directly in front of the corresponding LED, the phenomenon of alternating light and dark on the light-in side of the light source can be partially alleviated or eliminated.
  • the low-reflection dot 2 may be a groove, or a protrusion, a groove or a protrusion formed on the surface of the reflective film 1 to enable diffused reflection of the light-emitting side region of the LED light bar on the surface of the reflective film 1 to avoid The specular reflection phenomenon reduces the light reflectance of the corresponding region of the low reflection dot 2 .
  • the grooves or projections may be formed by stamping at a corresponding position on the surface of the reflective film 1 by a mold.
  • the low reflection dot 2 can also be a low reflectivity material coating.
  • Low-reflection dot-dot low-reflectivity material coating setting the reflectivity of the incident light of the LED strip 3 by selecting the low-reflectance material is smaller than the reflectance of the incident light of the other area of the reflective film on the LED strip 3, and reducing the spot 2 The light reflectance of the corresponding area.
  • Low reflectivity material coatings can be achieved by printing. Low reflectivity material coatings can be selected from low levels of barium sulfate.
  • the ⁇ spot 2 can also be implemented in other ways, as long as the area corresponding to the low-reflection dot 2 is opposite to the low-reflection dot 2 of the incident light of the LED strip 3 located at the side of the low-reflection dot of the column.
  • the shape may be a circle, or a triangle, or a polygon, and these shapes may be optical dot shapes that are commonly used to change the direction of light transmission and change the reflectance of light.
  • At least one column of second mesh dots parallel to a row of low reflection dots 2 may be further disposed on a side of the row of low reflection dots 2 opposite to the LED strip 3, the second low reflection
  • the reflectivity of the dot area to the incident light of the LED strip 3 may have a different shape on the spot 2 of the surface of the reflective film.
  • an embodiment of the present invention further provides a backlight module including a light guide plate, an LED light bar disposed on the light incident side of the light guide plate, and a reflective film disposed on the reflective surface of the light guide plate.
  • a backlight module including a light guide plate, an LED light bar disposed on the light incident side of the light guide plate, and a reflective film disposed on the reflective surface of the light guide plate.
  • an embodiment of the present invention further provides a display device, which includes The backlight module described above is included.
  • the display device may be: a product or a component having a display function such as a liquid crystal television, a notebook computer, a tablet computer, a mobile phone, a digital photo frame, an electronic paper, or the like.
  • the embodiment of the present invention makes the reflectance of the low-reflection dot area lower than that of other areas of the surface of the reflective film by providing a spot on the surface of the reflective film.
  • the LED light bar enters the light side area, and the LED facing position becomes a low reflection area, which reduces the reflectance of the LED light bar to the light side, thereby reducing or eliminating the phenomenon that the light source enters the light side alternately, thereby further improving the display quality of the display device. .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种反射膜、具有反射膜的背光模组以及具有背光模组的显示装置，反射膜（1）表面边缘一侧设置有一列低反射网点（2），低反射网点（2）区域对位于该列低反射网点（2）侧部的LED灯条入射光线的反射率小于反射膜（1）表面其它区域对LED灯条入射光线的反射率。显示装置具有背光模组，该背光模组具有反射膜（1）。反射膜（1）实现了LED灯条入射光侧区域中，LED正对位置变为低反射区，降低LED灯条入光侧的反射率，来减轻或消除光源入光侧明暗交替的现象，进一步提高显示装置的显示质量。

Description

反射膜、 背光模组和显示装置 技术领域
本发明的实施例涉及显示技术领域， 特别是涉及一种反射膜、 背光模组 和显示装置。 背景技术
目前的反射膜在显示装置背光模组领域应用， 主要是利用反射膜的高反 射来实现光线的有效利用。 现有反射膜的结构主要包括三层， 可参照图 1所 示， 由上至下依次是反射层 101、 PET ( Poly Ethylene Terephthalate , 聚对苯 二甲酸类塑料）层 102和背面涂层 103, 三层叠置。 在用于背光模组时， 将 反射膜贴附在背光模组的导光板反射面上即可。 但是， 在侧入式光源形式的 背光模组中， 灯条上相邻 LED之间具有一定间距。根据光学原理， 在光源入 光侧， 每个 LED正前方所对应的反射面上反射光线最强， 两个相邻 LED之 间的区域所对应的反射面上反射光线较弱， 从而出现反射面上入光侧明暗交 替规律出现， 即显示行业常见的热点现象， 从而降低显示装置的显示质量。 发明内容
本发明的实施例提供一种反射膜， 所述反射膜表面边缘一侧设置有一列 i^ 网点，低反射网点区域对位于该列 射网点侧部的 LED灯条入射光 线的反射率小于反射膜表面其它区域对所述 LED灯条入射光线的反射率。
其中， 所述一列低反射网点与所述 LED灯条平行设置。
其中， 所述低反射网点的数量与所述 LED灯条中 LED的数量相等， 一 个低反射网点位于与其对应的 LED的正前方。
其中， 所述低反射网点为形成在反射膜表面上的凹槽、 或凸起、 或低反 射率材料涂层；该低反射率材料对 LED灯条入射光线的反射率小于反射膜表 面其它区域对 LED灯条入射光线的反射率。
其中， 所述氐反射网点的形状为圓形、 或三角形、 或多边形。
本发明的实施例还提供了一种背光模组， 其包括导光板， 设置在导光板 入光侧的 LED灯条， 以及设置在导光板底反射面上的反射膜，所述反射膜为 上述任一项所述的反射膜。
本发明的实施例进一步提供了一种显示装置， 其包括上述所述的背光模 组。 附图说明
图 1是现有技术中反射膜的结构示意图；
图 2是本发明实施例中反射膜与背光源相对位置示意图。
其中， 101 : 反射层； 102: PET层； 103: 背面涂层； 1 : 反射膜； 2: ^^射网点； 3: LED灯条。 具体实施方式
为使本发明实施例的目的、 技术方案和优点更加清楚， 下面将结合本发 明实施例的附图，对本发明实施例的技术方案进行清楚、 完整地描述。显然， 所描述的实施例是本发明的一部分实施例， 而不是全部的实施例。 基于所描 述的本发明的实施例， 本领域普通技术人员在无需创造性劳动的前提下所获 得的所有其他实施例， 都属于本发明保护的范围。 下面结合附图和实施例， 对本发明的具体实施方式作进一步详细描述。 以下实施例用于说明本发明， 但不用来限制本发明的范围。
本实施例提供了一种反射膜， 该反射膜主要应用于显示装置的背光模组 中， 参照背光模组的光源位置来设置。 具体可参照图 1所示， 反射膜 1在现 有反射膜结构的表面边缘一侧设置一列低反射网点 2。 低反射网点 2所对应 区域对该列低反射网点侧部的 LED灯条 3入射光线的反射率小于反射膜 1 表面其它区域对所述 LED灯条 3入射光线的反射率。 LED灯条 3向其前方 的反射膜 1上发射光线， 在 LED灯条入光侧， 通过在 LED正对区域设置低 反射网点 2, 能够降低此处光线的反射率， 避免该处区域亮度比其他区域亮 度大， 降低或消除 LED灯条入光侧明暗交替的现象。
具体地，所述一列低反射网点 2与所述 LED灯条 3平行设置，从而低反 射网点 2对 LED灯条入光侧入射光线反射率具有均匀的降低作用。所述低反 射网点 2的数量可以与所述 LED灯条 3中 LED的数量相等， 每个低反射网 点 2位于与其对应的 LED的正前方。 因为在 LED灯条入光侧，每个 LED发 出的光线中， LED正前方的光线亮度最大， 将^^射网点 2设置在 LED正 前方， 能够有效地降低 LED灯条入光侧入射光线反射率，避免明暗交替现象 的出现。 如果低反射网点 2的数量小于 LED灯条 3中 LED的数量， 每个低 反射网点 2位于与其对应的 LED的正前方，则可以局部的减轻或消除光源入 光侧明暗交替的现象。
所述低反射网点 2可以为形成在反射膜 1表面上的凹槽、 或凸起， 凹槽 或凸起的设置， 能够实现反射膜 1表面上 LED灯条入光侧区域的漫反射，避 免镜面反射现象， 从而降低低反射网点 2对应区域的光线反射率。 凹槽或凸 起可以采用模具在反射膜 1表面上对应位置进行沖压形成。
所述低反射网点 2也可以是低反射率材料涂层。 低反射网点低反射率材 料涂层的设置，通过选择低反射率材料对 LED灯条 3入射光线的反射率小于 反射膜表面其它区域对 LED灯条 3入射光线的反射率， 降低^ 射网点 2 对应区域的光线反射率。 低反射率材料涂层可以通过印刷方式实现。 低反射 率材料涂层可选用低含量硫酸钡的材料。
同样地， ^^射网点 2也可以采用其他方式来实现， 只要能够满足低反 射网点 2所对应区域对位于该列低反射网点侧部的 LED灯条 3入射光线的反 所述低反射网点 2的形状具体可以为圓形、 或三角形、 或多边形， 这些 形状可以为改变光线传输方向、 改变光线反射率常用的光学网点形状。
根据需要，可以在所述一列低反射网点 2的与所述 LED灯条 3相反的一 侧， 进一步设置与一列低反射网点 2平行的至少一列第二 ^^射网点， 所述 第二低反射网点区域对所述 LED灯条 3入射光线的反射率'〗、于反射膜表面的 射网点 2可以具有不同的形状。
基于上述反射膜， 本发明的实施例还提供了一种背光模组， 其包括导光 板，设置在导光板入光侧的 LED灯条， 以及设置在导光板底反射面上的反射 膜。反射膜和 LED灯条的设置方式、相对位置可参照图 1所示， 具体细节参 见上述关于反射膜的结构描述中， 在此不进一步赘述。
基于上述背光模组， 本发明的实施例进一步提供了一种显示装置， 其包 括上述所述的背光模组。 所述显示装置可以为： 液晶电视、 笔记本电脑、 平 板电脑、 手机、 数码相框、 电子纸等任何具有显示功能的产品或部件。
由以上实施例可以看出， 本发明实施例通过在反射膜表面设置 射网 点， 使低反射网点区域的反射率低于反射膜表面其它区域的反射率， 使得
LED灯条入光侧区域中， LED正对位置变为低反射区， 降低 LED灯条入光 侧的反射率， 来减轻或消除光源入光侧明暗交替的现象， 进一步提高显示装 置的显示质量。
以上所述仅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， 在不脱离本发明技术原理的前提下， 还可以做出若干改进 和替换， 这些改进和替换也应视为本发明的保护范围。

Claims

权利要求书
1、一种反射膜， 其中， 所述反射膜表面边缘一侧设置有一列第一低反射 网点，所述第一 射网点区域对该列第一低反射网点侧部的 LED灯条入射 光线的反射率小于反射膜表面其它区域对所述 LED灯条入射光线的反射率。
2、如权利要求 1所述的反射膜， 其中， 所述一列第一 ^J 射网点与所述 LED灯条平行设置。
3、如权利要求 1或 2所述的反射膜， 其中， 所述第一^ 射网点的数量 与所述 LED灯条中 LED的数量相等， 每个第一低反射网点位于与其对应的 LED的正前方。
4、如权利要求 1或 2所述的反射膜， 其中， 所述第一^ 射网点的数量 、于所述 LED灯条中 LED的数量，每个第一低反射网点位于与其对应的 LED 的正前方。
5、如权利要求 1至 4中任一项所述的反射膜， 其中， 所述第一低反射网 点为形成在反射膜表面上的凹槽、 或凸起、 或低反射率材料涂层； 该低反射 率材料对 LED 灯条入射光线的反射率小于反射膜表面的所述其它区域对 LED灯条入射光线的反射率。
6、如权利要求 1至 5中任一项所述的反射膜， 其中， 所述第一低反射网 点的形状为圓形、 或三角形、 或多边形。
7、如权利要求 1至 6中任一项所述的反射膜，其中在所述一列第一^^ 射网点的与所述 LED灯条相反的一侧，设置与所述一列第一^^射网点平行 的至少一列第二低反射网点，所述第二 射网点区域对所述 LED灯条入射 光线的反射率小于反射膜表面的所述其它区域对所述 LED灯条入射光线的 反射率。
8、如权利要求 7所述的反射膜，其中所述第二^^射网点与所述第一低 反射网点具有不同的形状。
9、 一种背光模组， 其包括导光板、 设置在导光板入光侧的 LED灯条、 以及设置在导光板底反射面上的反射膜， 所述反射膜为权利要求 1-8中任一 项所述的反射膜。
10、 一种显示装置， 其包括权利要求 9中所述的背光模组。
PCT/CN2013/086751 2013-05-09 2013-11-08 反射膜、背光模组和显示装置 Ceased WO2014180103A1 (zh)

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