WO2017020353A1 - 导光板、背光模组及显示装置 - Google Patents

导光板、背光模组及显示装置 Download PDF

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Publication number
WO2017020353A1
WO2017020353A1 PCT/CN2015/087783 CN2015087783W WO2017020353A1 WO 2017020353 A1 WO2017020353 A1 WO 2017020353A1 CN 2015087783 W CN2015087783 W CN 2015087783W WO 2017020353 A1 WO2017020353 A1 WO 2017020353A1
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Prior art keywords
light
guide plate
light guide
backlight module
film layer
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Ceased
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PCT/CN2015/087783
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English (en)
French (fr)
Inventor
常建宇
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/783,989 priority Critical patent/US20170153385A1/en
Publication of WO2017020353A1 publication Critical patent/WO2017020353A1/zh
Anticipated expiration legal-status Critical
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    • 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
    • G02B6/0081—Mechanical or electrical aspects of the light guide and light source in the lighting device peculiar to the adaptation to planar light guides, e.g. concerning packaging
    • G02B6/0086—Positioning aspects
    • G02B6/0088—Positioning aspects of the light guide or other optical sheets in the package
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0041—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided in the bulk of the light guide
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • 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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—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 for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention relates to the field of liquid crystal display technologies, and in particular, to a light guide plate, a backlight module, and a display device.
  • liquid crystal display devices have been widely used as display components of electronic devices in various electronic products, and the borders of these electronic devices are becoming narrower and narrower, and the brightness requirements are also higher and higher, and at the same time meeting the requirements of power saving;
  • the backlight module is an important component in the liquid crystal display device.
  • the backlight module includes a light guide plate, a plastic frame disposed around the light guide plate, a light source, a flexible circuit board optical film, and the like, and the light source flexible circuit board is fixed to the light guide plate by the light shielding tape and On the plastic frame.
  • the light emitted by the light source enters the light guide plate, and the light is uniformly emitted through the mesh point at the bottom of the light guide plate. Generally, part of the light is directly transmitted from the lower surface of the light guide plate.
  • an optical film is usually placed on the surface of the light guide plate to increase the brightness, but the film itself is also likely to cause some of the light emitted from the light guide plate to be absorbed by the optical film, and the portion of the light also has a chance to be from the lower surface of the light guide plate. Transmitted out, causing light loss.
  • the technical problem to be solved by the present invention is to provide a light guide plate that improves the utilization of a light source.
  • the invention also provides a backlight module and a display device.
  • the present invention provides a light guide plate, the light guide plate includes a light incident surface, a light exit surface, and a bottom surface opposite to the light exit surface, the light incident surface is connected to the bottom surface and the light exit surface, and the bottom surface is coated A reflective film layer is disposed, and the dot layer of the light guide plate is disposed on the light emitting surface.
  • the outer surface of the reflective film layer is provided with a reflective coating.
  • the reflective film layer is formed of a mixed foaming agent.
  • the reflective film layer is formed of a material having a refractive index lower than a refractive index of the light guide plate.
  • the mixed foaming agent is sodium hydrogencarbonate.
  • the material whose transmittance is lower than the refractive index of the light guide plate is magnesium fluoride.
  • the reflective coating material is silver or aluminum.
  • the present invention provides a backlight module including a plastic frame, a light source, and an optical film.
  • the backlight module further includes the light guide plate.
  • the light source is located on one side of the light incident surface, and the optical film
  • the sheet is laminated on the light emitting surface, and the plastic frame houses the light source, the optical film and the light guide plate.
  • the light source comprises an aluminum substrate and an LED lamp on the aluminum substrate, the aluminum substrate is fixed with the plastic frame, and the LED lamp is disposed opposite to the light incident surface.
  • the present invention provides a display device, which includes a backlight module and a liquid crystal panel.
  • the backlight module includes a plastic frame, a light source, an optical film, and a light guide plate.
  • the light guide plate includes a light incident surface and a light emitting surface.
  • a bottom surface opposite to the light-emitting surface, the light-incident surface is connected to the bottom surface and the light-emitting surface, the bottom surface is coated with a reflective film layer, and the light-emitting surface is provided with a dot layer of the light guide plate
  • the light source is located on one side of the light incident surface, and the optical film is laminated on the light emitting surface, and the plastic frame houses the light source, the optical film and the light guide plate;
  • the panel is disposed on the backlight module, and the liquid crystal panel and the plastic frame are fixed by double-sided tape.
  • the backlight module of the present invention comprises a light guide plate provided with a reflective film layer on the bottom surface, which can reduce the leakage of the side light input light source from the bottom surface of the light guide plate after entering the light guide plate, thereby providing utilization of the light source and saving the use of the reflective sheet. In turn, the back plate carrying the reflective sheet is saved, and the thickness of the backlight module is reduced.
  • FIG. 1 is a schematic cross-sectional view of a light guide plate in a preferred embodiment of the present invention.
  • FIG. 2 is a schematic cross-sectional view of a backlight module of the present invention.
  • Fig. 3 is a schematic cross-sectional view showing another embodiment of the light guiding plate of the present invention.
  • a preferred embodiment of the present invention provides a light guide plate 10 for use in a backlight module.
  • the light guide plate 10 includes a light incident surface 11 , a light exit surface 12 , and a bottom surface 13 opposite to the light exit surface 12 .
  • the light incident surface 11 connects the bottom surface 13 and the light exit surface 12 .
  • a reflective film layer 14 is disposed on the bottom surface 13 , and a dot layer (not labeled) of the light guide plate is disposed on the light emitting surface 12 .
  • the light guide plate 10 is a rectangular plate body.
  • the dot layer is disposed on the light-emitting surface 12 of the light guide plate 10, and cooperates with the reflective film layer 14 of the bottom surface 13 to perform light entering the light-incident surface of the light guide plate and light reflected from the reflective film layer 14
  • Uniformly scattering and emitting the light-emitting surface 12 the light of all the light sources in the light guide plate can be uniformly scattered as much as possible compared with the halftone layer provided at the bottom, so as to avoid affecting the light guide plate because the light returned by the reflective structure is not scattered. Uniformity of the light source.
  • the dot layer is formed by a laser dot pattern.
  • the reflective film layer 14 is formed on the bottom surface 13 by coating a mixed foaming agent.
  • the mixed blowing agent is sodium hydrogencarbonate.
  • the light guide plate 10 is at normal temperature, and the reflective film layer 14 reacts, and no bubbles are generated.
  • the reflective film layer 14 formed by the mixed foaming agent generates bubbles at a certain temperature, and the bubbles are arranged in the reflective film layer to form a reflection effect, and the light entering the light guide plate and incident on the bottom surface 13 is reversed to the light output.
  • the surface 12 emits the light guide plate 10 through the mesh layer to prevent light from being emitted from the bottom surface 13 and reduce the amount of light loss.
  • the outer surface of the reflective film layer 14 is provided with a reflective coating (not shown). It is used for recovering other light sources leaking out of the reflective film layer 14 in the light guide plate, thereby further improving the utilization rate of the light source.
  • a preferred embodiment of the present invention further provides a backlight module.
  • the backlight module includes the light guide plate 10 , the plastic frame 20 , the light source 30 , and the optical film 40 .
  • the plastic frame 20 houses the light source 30, the optical film 40, and the light guide plate 10.
  • the optical film 40 is laminated on the light-emitting surface 12 of the light guide plate 10 , and the light source 30 is located on one side of the light-incident surface 11 .
  • the reflective film layer 14 of the light guide plate 10 in FIG. 2 is in a state of being reacted after heating (the heat source is the light source 30).
  • the heat or the heat of the internal components such as the terminal circuit board of the module generates air bubbles internally, thereby generating total reflection, so that all the light at the bottom of the light guide plate 10 is reflected back to the light exit surface.
  • the plastic frame 20 is a rectangular frame structure disposed around the periphery of the light guide plate 10.
  • the edge of the optical film 40 is fixed by a double-sided tape 17 facing the light-incident surface 11 of the light guide plate 10 .
  • the light source 30 includes an aluminum substrate 31 lasing and an LED lamp 32 on the aluminum substrate 31.
  • the aluminum substrate 31 is fixed to the plastic frame 20, and the LED lamp 32 is disposed opposite to the light incident surface 11.
  • the reflective film layer 17 is formed of a material having a refractive index lower than that of the light guide plate 10.
  • the material whose rate of incidence is lower than the refractive index of the light guide plate may be magnesium fluoride.
  • the backlight module of the present invention comprises a light guide plate 10 having a reflective film layer on the bottom surface thereof, which can reduce the leakage of the side light source light source from the bottom surface of the light guide plate 10 after entering the light guide plate, thereby providing utilization of the light source and saving the use of the reflection sheet. Moreover, the back plate carrying the reflective sheet is saved, and the thickness of the backlight module is reduced.
  • the present invention also provides a display device (not shown), the display device includes the backlight module and a liquid crystal panel, the liquid crystal panel is disposed on the backlight module, and the liquid crystal panel and the glue
  • the frames are fixed by double-sided tape.
  • the display device can be a mobile phone, a palmtop computer, a display, or the like.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Planar Illumination Modules (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)

Abstract

一种导光板（10）、背光模组及显示装置，背光模组包括胶框（20）、灯源（30）、光学膜片（40）及导光板（10），所述导光板（10）包括入光面（11）、出光面（12）及与所述出光面（12）相对设置的底面（13），所述入光面（11）连接所述底面（13）与所述出光面（12），所述底面（13）上涂设有反射膜层（14），所述出光面（12）上设置所述导光板（10）的网点层，所述灯源（30）位于所述入光面（11）的一侧，所述光学膜片（40）层叠设于所述出光面（12）上，所述胶框（20）将所述灯源（30）、光学膜片（40）及导光板（10）收容。

Description

导光板、背光模组及显示装置
本发明要求2015年7月31日递交的发明名称为“导光板、背光模组及显示装置”的申请号201510465051.6的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及液晶显示技术领域，特别涉及一种导光板、背光模组及显示装置。
背景技术
目前，液晶显示装置作为电子设备的显示部件已经广泛的应用于各种电子产品中，这些电子设备的边框越来越窄，亮度要求也越来越高，同时还要满足省电的要求；而背光模组则是液晶显示装置中的一个重要部件。
所述背光模组包括导光板、设置于所述导光板周围的胶框、灯源、柔性电路板光学膜片等，所述灯源柔性电路板通过所述遮光胶带固定于所述导光板和胶框上。对于侧入式背光模组来说，灯源发出的光线进入导光板，通过导光板底部的网点实现光的均匀射出，一般来讲会有部分光从导光板下表面直接透射出去。另外，通常在导光板上表面会放置光学膜片，用来增加亮度，但膜片本身也容易导致部分从导光板出射光线会被光学膜片吸收，该部分光线亦有机会从导光板下表面透射出去，造成光损失。
发明内容
本发明所要解决的技术问题在于提供一种提高光源利用率的导光板。
本发明还提供一种背光模组及显示装置。
为了实现上述目的，本发明实施方式提供如下技术方案：
本发明提供一种导光板，所述导光板包括入光面、出光面及与所述出光面相对设置的底面，所述入光面连接所述底面与所述出光面，所述底面上涂设有反射膜层，所述出光面上设置所述导光板的网点层。
其中，所述反射膜层外表面设有反射涂层。
其中，所述反射膜层由混合发泡剂形成。
其中，所述反射膜层由折射率低于导光板折射率的材料形成。
其中，所述混合发泡剂为碳酸氢钠。
其中，所述射率低于导光板折射率的材料为氟化镁。
其中，所述反射涂层材料为银或铝。
本发明提供一种背光模组，包括胶框、灯源、光学膜片，所述背光模组还包括所述的导光板所述灯源位于所述入光面的一侧，所述光学膜片层叠设于所述出光面上，所述胶框将所述灯源、光学膜片及导光板收容。
其中，所述灯源包括铝基板与铝基板上的LED灯，所述铝基板与胶框固定，所述LED灯与所述入光面相对设置。
本发明提供一种显示装置，所述显示装置包括背光模组和液晶面板，所述背光模组包括胶框、灯源、光学膜片及导光板，所述导光板包括入光面、出光面及与所述出光面相对设置的底面，所述入光面连接所述底面与所述出光面，所述底面上涂设有反射膜层，所述出光面上设置所述导光板的网点层，所述灯源位于所述入光面的一侧，所述光学膜片层叠设于所述出光面上，所述胶框将所述灯源、光学膜片及导光板收容；所述液晶面板设于所述背光模组上，且所述液晶面板与所述胶框之间通过双面胶固定。
本发明的背光模组包括底面设有反射膜层的导光板，可以减小侧光入式光源进入导光板后从导光板底面漏出，提供了光源的利用率，同时节省了反射片的使用，进而节省承载反射片的背板，减小了背光模组的厚度。
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，还可以如这些附图获得其他的附图。
图1是本发明较佳实施方式中的导光板截面示意图。
图2本发明的背光模组的截面示意图。
图3是本发明的导光板的另一实施方式截面示意图。
具体实施方式
下面将结合本发明实施方式中的附图，对本发明实施方式中的技术方案进行清楚、完整地描述。
请参阅图1，本发明的较佳实施例提供了一种导光板10，用于背光模组中。所述导光板10包括入光面11、出光面12及与所述出光面12相对设置的底面13。所述入光面11连接所述底面13与所述出光面12。所述底面13上涂设有反射膜层14，所述出光面12上设置所述导光板的网点层(图未标)。
本实施例中，所述导光板10为长方形板体。所述网点层设于所述导光板10的出光面12上，与底面13的反射膜层14配合，可以将导光板内的入光面进入的光线以及反射膜层14反射回来的光线均进行均匀散射而射出出光面12，与设于底部的网点层相比，能尽最大范围的使导光板内所有的光源的光线均匀散射，避免因为由反射结构回来的光没有散射而影响导光板的光源均匀性。本实施例中所述网点层通过镭射网点方式形成。
本发明第一实施方式中，所述反射膜层14由混合发泡剂通过涂布的方式形成于所述底面13上。优选的，所述混合发泡剂为碳酸氢钠。此时的导光板10处于常温下，反射膜层14为发生反应，没有气泡产生。所述由混合发泡剂形成的反射膜层14在一定温度下产生气泡，所述气泡排列于所述反射膜层内形成反射效果，将进入导光板内射入底面13的光反设至出光面12通过网点层射出导光板10，避免光线从底面13射出，降低光源的损耗量。
优选的，所述反射膜层14外表面装设有反射涂层(图未示)。用于回收所述导光板内泄露于反射膜层14外的其他光源，更进一步的提高了光源的利用率。
请参阅图2，本发明的较佳实施例还提供了一种背光模组，所述背光模组包括所述导光板10、胶框20、灯源30及光学膜片40。所述胶框20将所述灯源30、光学膜片40及导光板10收容。所述光学膜片40层叠设于所述导光板10的出光面12，所述灯源30位于所述入光面11的一侧。需要说明的是，本图2中的导光板10的反射膜层14是加热后发生反应的状态(热源为灯源30 的热量或者使用本模组的终端电路板等内部元件的热量)，内部产生气泡，进而产生全反射，使导光板10底部的光线全部反射回所述出光面上。
本实施例中，所述胶框20为矩形框体结构，其围绕所述导光板10周缘设置。所述光学膜片40边缘通过双面胶17与胶框固，所述灯源30朝向所述导光板10的入光面11。所述灯源30包括铝基板31激射与铝基板31上的LED灯32，所述铝基板31与胶框20固定，所述LED灯32与所述入光面11相对设置。
参阅图3，本发明另一实施方式中，所述反射膜层17由折射率低于导光板10折射率的材料形成。其中所述射率低于导光板折射率的材料可以为氟化镁。
本发明的背光模组包括底面设有反射膜层的导光板10，可以减小侧光入式光源进入导光板后从导光板10底面漏出，提供了光源的利用率，节省了反射片的使用，进而节省承载反射片的背板，减小了背光模组的厚度。
本发明还提供一种显示装置(图未示)，所述显示装置包括所述背光模组和液晶面板，所述液晶面板设于所述背光模组上，且所述液晶面板与所述胶框之间通过双面胶固定。所述显示装置可以为手机机、掌上电脑、显示器等。
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 (16)

  1. 一种导光板，所述导光板包括入光面、出光面及与所述出光面相对设置的底面，所述入光面连接所述底面与所述出光面，其中，所述底面上涂设有反射膜层，所述出光面上设置所述导光板的网点层。
  2. 如权利要求1所述的导光板，其中，所述反射膜层外表面设有反射涂层。
  3. 如权利要求1所述的导光板，其中，所述反射膜层由混合发泡剂形成。
  4. 如权利要求1所述的导光板，其中，所述反射膜层由折射率低于导光板折射率的材料形成。
  5. 如权利要求3所述的导光板，其中，所述混合发泡剂为碳酸氢钠。
  6. 如权利要求4所述的导光板，其中，所述射率低于导光板折射率的材料为氟化镁。
  7. 如权利要求2所述的导光板，其中，所述反射涂层材料为银或铝。
  8. 一种背光模组，包括胶框、灯源、光学膜片，其中，所述背光模组还包括导光板所述灯源位于所述入光面的一侧，所述导光板包括入光面、出光面及与所述出光面相对设置的底面，所述入光面连接所述底面与所述出光面，所述底面上涂设有反射膜层，所述出光面上设置所述导光板的网点层所述光学膜片层叠设于所述出光面上，所述胶框将所述灯源、光学膜片及导光板收容。
  9. 如权利要求8所述的背光模组，其中，所述反射膜层外表面设有反射涂层。
  10. 如权利要求8所述的背光模组，其中，所述反射膜层由混合发泡剂形成。
  11. 如权利要求8所述的背光模组，其中，所述反射膜层由折射率低于导光板折射率的材料形成。
  12. 如权利要求10所述的背光模组，其中，所述混合发泡剂为碳酸氢钠。
  13. 如权利要求11所述的背光模组，其中，所述射率低于导光板折射率的材料为氟化镁。
  14. 如权利要求9所述的背光模组，其中，所述反射涂层材料为银或铝。
  15. 如权利要求8所述的背光模组，其中，所述灯源包括铝基板与铝基 板上的LED灯，所述铝基板与胶框固定，所述LED灯与所述入光面相对设置。
  16. 一种显示装置，所述显示装置包括背光模组和液晶面板，所述背光模组包括胶框、灯源、光学膜片及导光板，其中，所述导光板包括入光面、出光面及与所述出光面相对设置的底面，所述入光面连接所述底面与所述出光面，所述底面上涂设有反射膜层，所述出光面上设置所述导光板的网点层，所述灯源位于所述入光面的一侧，所述光学膜片层叠设于所述出光面上，所述胶框将所述灯源、光学膜片及导光板收容；所述液晶面板设于所述背光模组上，且所述液晶面板与所述胶框之间通过双面胶固定。
PCT/CN2015/087783 2015-07-31 2015-08-21 导光板、背光模组及显示装置 Ceased WO2017020353A1 (zh)

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