WO2013159402A1 - 导光板及具有该导光板的背光模组 - Google Patents

导光板及具有该导光板的背光模组 Download PDF

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Publication number
WO2013159402A1
WO2013159402A1 PCT/CN2012/075271 CN2012075271W WO2013159402A1 WO 2013159402 A1 WO2013159402 A1 WO 2013159402A1 CN 2012075271 W CN2012075271 W CN 2012075271W WO 2013159402 A1 WO2013159402 A1 WO 2013159402A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
coating
top surface
disposed
Prior art date
Application number
PCT/CN2012/075271
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English (en)
French (fr)
Inventor
胡哲彰
贺虎
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/518,386 priority Critical patent/US9010980B2/en
Publication of WO2013159402A1 publication Critical patent/WO2013159402A1/zh

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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

Definitions

  • the present invention relates to the field of liquid crystal display, and in particular to a light guide plate having a coating and a backlight module having the same. Background technique
  • Liquid crystal display has many advantages such as thin body, power saving, and no radiation, and has been widely used.
  • Most of the liquid crystal display devices on the market are backlight type liquid crystal display devices, which include a liquid crystal panel and a backlight module.
  • the working principle of the liquid crystal panel is to place liquid crystal molecules in two parallel glass substrates. There are many vertical and horizontal small wires between the two glass substrates, and the liquid crystal molecules are controlled to change direction by energization or not, and the light of the backlight module is refracted. Come out to produce the picture. Since the liquid crystal panel itself does not emit light, the light source provided by the backlight module needs to be used to display the image normally. Therefore, the backlight module becomes one of the key components of the liquid crystal display device.
  • the backlight module is divided into a side-in backlight module and a direct-lit backlight module according to different incident positions of the light source.
  • a light source such as a CCFL (Cold Cathode Fluorescent Lamp) or an LED (Light Emitting Diode) is disposed behind the liquid crystal panel to directly form a surface light source for the liquid crystal panel.
  • the side-lit backlight module has a backlight LED strip (Light bar) disposed on the edge of the back panel behind the liquid crystal panel, and the light emitted by the LED strip light enters the light from the side of the light guide plate (LGP, Light Guide Plate). The surface enters the light guide plate, is reflected and diffused, and is emitted from the light exit surface of the light guide plate, and is supplied to the liquid crystal panel through the optical film group to form a surface light source.
  • LGP Light Guide Plate
  • the narrow-frame backlight module has also become a trend in the future.
  • the width of the optical film set 200 pressed under the plastic frame 300 is narrow, but in order to ensure that the optical film set 200 does not
  • the backlight module is slid out, and the general optical film set 200 directly extends to the edge of the light guide plate 400.
  • the light incident side of the light guide plate 400 directly enters the optical film group 200 due to the light of the LED light bar 100, and is directly emitted after being reflected.
  • the existing common practice is to design a retaining wall 302 on the plastic frame 300.
  • the optical film set 200 is attracted to the light guide plate 400, which changes the total internal reflection of light in the light guide plate 400, resulting in light.
  • Directly entering the optical film set 200 from the light guide plate 400 (the direction of light propagation is indicated by an arrow) forms a bright line on the light incident side of the light guide plate 400, and is liable to cause light loss.
  • the experimental research shows that the reason why the optical film group and the light guide plate absorb light leakage is that the refractive index of the light guide plate is close to that of the optical film.
  • the refractive index of PMMA It is 1.49
  • the refractive index of PET is greater than 1.50. Therefore, when light is emitted from the light guide plate to the contact interface, the light is transmitted from the light-diffusing medium to the light-tight medium, and the light does not totally reflect, but enters the optical film, thereby causing light leakage.
  • the non-light-incident side surface of the light guide plate 400 in order to prevent light from being emitted from the side surface of the light guide plate 400, usually adheres to the side reflection sheet 500, and the function is to pass the light emitted from the side surface of the light guide plate 400 to the side.
  • the reflective sheet 500 is reflected back to the light guide plate to increase the utilization of light.
  • the interface between the side reflection sheet 400 and the light guide plate 400 is not a smooth interface, light is diffused and reflected at the interface, causing light leakage. Summary of the invention
  • Another object of the present invention is to provide a backlight module that prevents light leakage by using a coated light guide plate, thereby improving the illumination intensity and uniformity of the entire backlight module.
  • the present invention provides a light guide plate, comprising: a body and a coating disposed on the body, the body comprising a bottom surface, a top surface corresponding to the bottom surface, and a plurality of sides between the bottom surface and the top surface, The coating is disposed on at least one side of the top surface, and the coating has a refractive index greater than or equal to 1 and less than a refractive index of the light guide body.
  • the coating is provided on the edge of the side of the top surface.
  • the coating is formed by printing or spraying.
  • the material of the body is PMMA, MS, or PC, and the refractive index of the body is 1.49 ⁇ 1.57.
  • the invention also provides a backlight module, comprising: a back plate, a backlight disposed in the back plate, a reflective sheet disposed in the back plate, a light guide plate disposed on the reflective sheet, and an optical film set disposed on the light guide plate And a plastic frame disposed on the back plate, the light guide plate includes a body and a coating disposed on the body, the body includes a bottom surface, a top surface corresponding to the bottom surface, and a plurality of sides between the bottom surface and the top surface, The coating is disposed on at least one side of the top surface, the refractive index of the coating is greater than or equal to 1, and is smaller than the refractive index of the light guide body, and the backlight is disposed opposite to the side of the light guide plate in the back panel .
  • the range of the coating on the top surface of the light guide plate body is in the range of the adhesive frame above the light guide plate Inside.
  • the coating is provided on the edge of the side of the top surface or has a gap with the edge of the side of the top surface.
  • the coating is formed by printing or spraying.
  • the body is made of PMMA, MS, or PC, and has a refractive index of 1.49 to 1.57.
  • Advantageous Effects of Invention According to the light guide plate of the present invention, by providing a coating on the top surface, light incident from the light incident surface and propagating to the top surface of the light guide plate can be reflected back to the light guide plate, so that the light propagates in the light guide plate to prevent the light from being transmitted through the light guide plate.
  • the backlight module of the invention effectively improves the edge leakage of the backlight module by using a coated light guide plate on the top surface The phenomenon of improving the optical grade of the module and facilitating the narrow frame of the backlight module.
  • FIG. 1 is a schematic structural view of a conventional backlight module
  • FIG. 2 is a schematic structural view of the backlight module of FIG. 1 after being improved
  • FIG. 3 is a schematic diagram of light propagation of a backlight in FIG. 2;
  • FIG. 4 is a schematic diagram of propagation of light in FIG. 2 after being reflected by a side reflection sheet;
  • FIG. 5 is a schematic perspective structural view of an embodiment of a light guide plate according to the present invention.
  • FIG. 6 is a schematic perspective structural view of another embodiment of a light guide plate according to the present invention.
  • FIG. 7 is a schematic structural view of an embodiment of a backlight module of the present invention.
  • FIG. 8 is a schematic structural view of another embodiment of a backlight module of the present invention. detailed description
  • a light guide plate 10 includes: a body 12 and a coating 14 disposed on the body 12 .
  • the body 12 includes a bottom surface 122 , a top surface 124 corresponding to the bottom surface 122 , and a bottom surface 122 . a plurality of sides 126 between the top surface 124, the coating layer 14 is disposed on the At least one side of the top surface 124, the refractive index of the coating layer 14 is greater than or equal to 1 and less than the refractive index of the body 12, where n represents the refractive index of the coating, representing the refractive index of the air, and nLCP represents the body 12 of the light guide plate 10.
  • the coating 14 is made of a material having a refractive index lower than that of the body 12 and approximately equal to the refractive index of air.
  • the coating 14 can be formed on the top surface 124 of the body 12 of the light guide plate 10 by printing or spraying.
  • the body 12 of the light guide plate 10 is made of PMMA (polymethyl methacrylate), MS (styrene-methyl methacrylate) or PC (polycarbonate), and has a refractive index of 1.49 to 1.57.
  • the coating 14 has a certain gap with the edge of the side of the top surface 124, that is, the outer edge 144 of the coating 14 and the side 126 of the body 12 of the light guide plate 10 have a certain gap. gap.
  • the coating layer 14 is disposed on the side of the top surface 124 such that the coating layer 14 is disposed in a "mouth" shape on the top surface 124 of the body 12 of the light guide plate 10.
  • a light guide plate 10 is different from the above embodiment in that: the coating layer 14 is disposed on an edge of a side of the top surface 124.
  • the coating layer 14 is disposed on the side edges of the top surface 124 such that the coating layer 14 is disposed on the top surface 124 of the body 12 of the light guide plate 10 in a "mouth" shape, that is, the coating layer 14
  • the outer edge 144 is in the same vertical plane as the corresponding side 126 of the body 12 of the light guide plate 10.
  • the light guide plate 10 of the present invention when light enters from the side 126 (light incident surface) of the light guide plate 10 and propagates to the interface between the body 12 of the light guide plate 10 and the coating layer 14, since the refraction of the coating layer 14 is greater than or equal to 1, And less than the refractive index of the body 12, so at this interface, the light from the optically dense medium to the light-diffusing medium, total reflection occurs when the incident angle of the light is greater than the critical angle of total reflection.
  • a backlight module having the above-mentioned light guide plate according to an embodiment of the present invention includes: a back plate 2 , a backlight 4 disposed in the back plate 2 , and a reflective sheet disposed in the back plate 2 . 6.
  • the coating layer 14 includes a bottom surface 122, a top surface 124 corresponding to the bottom surface 122, and a plurality of side surfaces 126 between the bottom surface 122 and the top surface 124.
  • the coating layer 14 is disposed on the top surface 124.
  • the refractive index of the coating layer 14 is smaller than the refractive index of the body 12, and the refractive index of the coating layer 14 is approximately equal to the refractive index of the air.
  • the optical film set 8 is disposed on the coating layer 14.
  • the backlight 4 is disposed opposite to the side surface 126 of the light guide plate 10 in the back plate 2, and the surface of the coating 14 on the top surface 124 of the body 12 of the light guide plate 10 is above the pressure of the plastic frame 9 above the light guide plate 10. Included in the scope.
  • the coating 14 is made of a material having a refractive index lower than that of the body 12 and approximately equal to the refractive index of air.
  • the coating 14 can be formed on the top surface 124 of the body 12 of the light guide plate 10 by printing or spraying.
  • the body 12 of the light guide plate 10 is made of PMMA (polymethyl methacrylate), MS (styrene-methyl methacrylate) or PC (polycarbonate), and has a refractive index of 1.49 to 1.57.
  • the coating 14 has a gap with the edge of the side of the top surface 124, i.e., there is a gap between the outer edge 144 of the coating 14 and the edge of the side of the top surface 124.
  • the coating layer 14 is disposed on the side of the top surface 124 such that the coating layer 14 is disposed on the top surface 124 of the body 12 of the light guide plate 10 in a "mouth" shape.
  • the plastic frame 9 faces the back plate 2 - the side is provided with a retaining wall 92.
  • the lower end of the retaining wall 92 abuts against the top surface 124 of the body 12 of the light guide plate 10, and mainly abuts against the outer edge and the top of the coating 14
  • the end of the plastic frame 9 above the light guide plate 10 covers the coating 14 of the light guide plate 10, so that the inner edge 142 of the coating layer 14 is not exposed outside the coverage of the plastic frame 9. That is, referring to FIG. 7, the inner side edge 142 of the coating 14 is located to the left of the side edge 90 of the bezel 9 in the vertical direction.
  • the light emitted from the backlight 4 enters the light incident surface of the side surface 126 of the light guide plate 10, and the light propagating to the top surface 124 is reflected by the coating layer 14 and then enters the light guide plate 10 (light propagation)
  • the direction is as shown by the arrow), and the light is prevented from directly entering the optical film group 8 from the light guide plate 10, thereby causing light loss, thereby effectively improving the light leakage at the edge of the backlight module and improving the optical grade of the module.
  • a backlight module having the above-mentioned light guide plate 10 includes: a back plate 2 , a backlight 4 disposed in the back plate 2 , and a reflection disposed in the back plate
  • the coating body 14 includes a bottom surface 122, a top surface 124 corresponding to the bottom surface 122, and a plurality of side surfaces 126 between the bottom surface 122 and the top surface 124.
  • the coating layer 14 is disposed on the top surface.
  • the refractive index of the coating 14 is less than the refractive index of the body 12, and the refractive index of the coating 14 is approximately equal to the refractive index of the air, and the optical film set 8 is disposed on the coating.
  • the backlight 4 is disposed opposite to the side surface 126 of the light guide plate 10 in the back plate 2 , and the coating 14 is on the top surface 124 of the body 12 of the light guide plate 10 in the frame 9 and the pressure above the light guide plate 10 . Included in the scope.
  • the coating 14 is made of a material having a refractive index that is less than the refractive index of the body 12 and that is approximately equal to the refractive index of air.
  • the coating layer 14 can be formed on the top surface 124 of the body 12 of the light guide plate 10 by printing or spraying.
  • the body 12 of the light guide plate 10 is made of PMMA (polymethyl methacrylate), MS (styrene-methyl methacrylate) or PC (polycarbonate), and the refractive index thereof. It is 1.49 ⁇ 1.57.
  • the plastic frame 9 is not provided with a retaining wall, and the coating 14 is disposed on the edge of the side of the top surface 124, that is, the outer edge 144 of the coating 14 and the body 12 of the light guide plate 10.
  • the corresponding sides 126 are in the same vertical plane.
  • the coating layer 14 is disposed on the edge of the side of the top surface 124 such that it is disposed in a "mouth" shape on the top surface 124 of the body 12 of the light guide plate 10.
  • the inner edge 142 of the coating 14 is located within the coverage of the bezel 9, i.e., as shown in Fig. 8, the inner edge 142 of the coating 14 is located on the left side of the side edge 90 of the bezel 9, in the vertical direction. .
  • the backlight module further includes a side reflection sheet 5 attached to the side surface 126 of the light guide plate 10, and the light is reflected by the side reflection sheet 5, and then reflected back to the light guide plate 10 via the coating layer 14 ( The direction of light propagation is as indicated by the arrow) to prevent light leakage and further improve the light intensity and uniformity of the entire backlight module.
  • the light guide plate of the present invention can reflect the light incident from the light incident surface and propagate to the top surface of the light guide plate back to the light guide plate by providing a coating on the top surface, so that the light propagates in the light guide plate to prevent the light from being transmitted through the light guide plate.
  • Light leakage, thereby ensuring the light intensity and uniformity of the light guide plate, and the structure of the structure is simple, and the cost is low;
  • the backlight module of the present invention effectively improves the backlight through the use of a light guide plate with a coating on the top surface
  • the phenomenon of light leakage at the edge of the module enhances the optical grade of the module and facilitates the narrow frame of the backlight module.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

一种导光板（10）及具有导光板（10）的背光模组。导光板（10）包括：本体（12）及设于本体上的涂层（14），本体（12）包括底面（122）、与底面对应的顶面（124）及位于底面与顶面之间的数个侧面（126），涂层（14）设于顶面（124）的至少一侧边上，涂层（14）的折射率大于或等于1，且小于本体（12）的折射率。通过在顶面（124）设置涂层（14），可将由导光板（10）入光面射入并传播到导光板顶面的光线反射回导光板，使其在导光板中传播，防止漏光，进而保证导光板的光照强度及均匀度，且制作简单，成本低。

Description

导光板及具有该导光板的背光模组 技术领域
本发明涉及液晶显示领域， 尤其涉及一种具有涂层的导光板及具有该 导光板的背光模组。 背景技术
液晶显示装置（LCD, Liquid Crystal Display )具有机身薄、 省电、 无 辐射等众多优点， 得到了广泛的应用。 现有市场上的液晶显示装置大部分 为背光型液晶显示装置， 其包括液晶面板及背光模组 （ backlight module ) 。 液晶面板的工作原理是在两片平行的玻璃基板当中放置液晶分 子， 两片玻璃基板中间有许多垂直和水平的细小电线， 通过通电与否来控 制液晶分子改变方向， 将背光模组的光线折射出来产生画面。 由于液晶面 板本身不发光， 需要借由背光模组提供的光源来正常显示影像， 因此， 背 光模组成为液晶显示装置的关键组件之一。 背光模组依照光源入射位置的 不同分成侧入式背光模组与直下式背光模组两种。 直下式背光模组是将发 光光源例如 CCFL(Cold Cathode Fluorescent Lamp , 阴极萤光灯管）或 LED(Light Emitting Diode发光二极管)设置在液晶面板后方， 直接形成面 光源提供给液晶面板。 而侧入式背光模组是将背光源 LED 灯条（Light bar ) 设于液晶面板侧后方的背板边缘， LED 灯条发出的光线从导光板 ( LGP , Light Guide Plate ) 一侧的入光面进入导光板， 经反射和扩散后 从导光板出光面射出， 在经由光学膜片组， 以形成面光源提供给液晶面 板。
请参阅图 1 , 随着 LED灯条 100作为背光源的发展， 窄边框背光模组 也成为未来发展的趋势。 为了追逐窄边框的设计， 同时保证光学膜片组 200 ( films ) 的信赖性， 在胶框 300 下压附的光学膜片组 200 的宽度很 窄， 但为了保证光学膜片组 200不会从背光模组中滑出， 一般光学膜片组 200会直接伸到与导光板 400边缘。 这样导光板 400的入光侧会因为 LED 灯条 100的光线直接进入光学膜片组 200中， 经过反射后直接射出。
为了解决上述问题， 现有的通用做法为在胶框 300，上设计挡墙 302，
(如图 2所示） ， 以阻止光线直接射入光学膜片组 200中。
然而， 如图 3所示， 由于胶框 300，的压附作用， 光学膜片组 200会与 导光板 400吸附在一起， 改变了光线在导光板 400中的内全反射， 导致光 从导光板 400 中直接射入光学膜片组 200 中 （光线传播方向如箭头所 示） ， 在导光板 400入光侧形成亮线， 且易造成光的损耗。
经试研究表明， 光学膜片组与导光板吸附产生漏光的原因是， 导光板 的折射率与光学膜片接近， 以 PMMA材质的导光板与 PET材质的光学膜 片为例， PMMA的折射率为 1.49, 而 PET的折射率为大于 1.50。 因此当 光线从导光板射向该接触界面时， 光是从光疏介质传向光密介质， 光线不 会发生全反射， 而会进入光学膜片， 从而导致漏光。
另， 如图 4 所示， 为了防止光线从导光板 400 的侧面射出， 导光板 400 的非入光侧面通常会贴附侧反射片 500, 其作用是将从导光板 400侧 面射出的光线经侧反射片 500反射回导光板， 增加光线的利用率。 但由于 侧反射片 400与导光板 400贴附的界面并非光滑的界面， 光线在此界面会 发生漫反射， 造成漏光。 发明内容
本发明的目的在于提供一种导光板， 其顶面设有涂层， 可将传播到导 光板顶面的光线反射回导光板， 提高导光板的光照强度及均匀度。
本发明另一目的在于提供一种背光模组， 通过具有涂层的导光板的使 用， 防止漏光， 提高了整个背光模组的光照强度及均匀度。
为实现上述目的， 本发明提供一种导光板， 包括： 本体及设于本体上 的涂层， 所述本体包括底面、 与底面对应的顶面及位于底面与顶面之间的 数个侧面， 所述涂层设于该顶面的至少一侧边上， 该涂层的折射率大于或 等于 1 , 且小于导光板本体的折射率。
所述涂层与顶面侧边的边缘之间具有间隙。
所述涂层设于顶面侧边的边缘上。
所述涂层的形成方式为印刷或喷涂。
所述本体的材质为 PMMA、 MS、 或 PC , 本体的折射率为 1.49~1.57。
本发明还提供一种背光模组， 包括： 背板、 设于背板内背光源、 设于 背板内的反射片、 设于反射片上的导光板、 设于导光板上的光学膜片组及 设于背板上的胶框， 所述导光板包括本体及设于本体上的涂层， 所述本体 包括底面、 与底面对应的顶面及位于底面与顶面之间的数个侧面， 所述涂 层设于该顶面的至少一侧边上， 该涂层的折射率大于或等于 1 , 且小于导 光板本体的折射率， 背光源于背板内与导光板的侧面呈相对设置。
所述涂层于导光板本体顶面上的范围在胶框于导光板上方的压附范围 内。
所述涂层设于顶面侧边的边缘上， 或与顶面侧边的边缘之间具有间 隙。
所述涂层的形成方式为印刷或喷涂。
所述本体的材质为 PMMA、 MS、 或 PC, 其的折射率为 1.49~1.57。 本发明的有益效果： 本发明导光板， 通过在顶面设置涂层， 可将由入 光面射入并传播到导光板顶面的光线反射回导光板， 使得该光线在导光板 中传播， 防止漏光， 进而保证该导光板的光照强度及均勾度， 且制作筒 单， 成本低； 本发明背光模组， 通过顶面上设有涂层导光板的使用， 有效 的改善背光模组边缘漏光的现象， 提升模组的光学品级， 且有利于实现背 光模组的窄边框化。
为了能更进一步了解本发明的特征以及技术内容， 请参阅以下有关本 发明的详细说明与附图， 然而附图仅提供参考与说明用， 并非用来对本发 明加以限制。 附图说明
下面结合附图， 通过对本发明的具体实施方式详细描述， 将使本发明 的技术方案及其它有益效果显而易见。
附图中，
图 1为现有背光模组结构示意图；
图 2为图 1中背光模组改进后的结构示意图；
图 3为图 2中背光源光线传播示意图；
图 4为图 2中光线经由侧反射片反射后的传播示意图；
图 5为本发明导光板一实施例的立体结构示意图；
图 6为本发明导光板的另一实施例的立体结构示意图；
图 7为本发明背光模组一实施例的结构示意图；
图 8为本发明背光模组另一实施例的结构示意图。 具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果， 以下结合本发明 的优选实施例及其附图进行详细描述。
请参阅图 5, 本发明一实施例的导光板 10, 包括： 本体 12及设于本 体 12上的涂层 14, 所述本体 12 包括底面 122、 与底面 122对应的顶面 124及位于底面 122与顶面 124之间的数个侧面 126, 所述涂层 14设于该 顶面 124的至少一侧边， 所述涂层 14的折射率大于或等于 1 , 且小于本体 12 的折射率， 以 n代表涂层折射率， 代表空气折射率， nLCP代表导光板 10本体 12折射率， 空气折射率为 1 , 即 n > nair=l , n < nLGP。
所述涂层 14采用折射率小于本体 12的折射率， 且近似等于空气的折 射率的材料制成。 涂层 14可采用印刷或喷涂等方式形成于导光板 10本体 12顶面 124上。 所述导光板 10本体 12的材质为 PMMA (聚甲基丙烯酸 甲酯） 、 MS (苯乙烯 -甲基丙烯酸甲酯）或 PC (聚碳酸酯）等， 其折射率 为 1.49~1.57。
在本实施例中， 所述涂层 14 与顶面 124侧边的边缘之间具有一定间 隙， 即， 该涂层 14的外侧边缘 144与导光板 10的本体 12的侧边 126之 间具有一定间隙。 所述涂层 14设于顶面 124四周侧边上， 使得涂层 14呈 "口" 字形设置于导光板 10的本体 12的顶面 124上。
参阅图 6 , 本发明另一实施例的导光板 10 , 其与上述实施例不同的 是： 所述涂层 14设于顶面 124侧边的边缘上。 在本实施例中， 所述涂层 14设于顶面 124四周侧边边缘上， 使得涂层 14呈 "口" 字形设置于导光 板 10的本体 12的顶面 124上， 即涂层 14的外侧边缘 144与导光板 10的 本体 12的对应侧边 126在同一竖直平面内。 本发明的导光板 10, 当光线 自导光板 10侧面 126 (入光面）进入， 传播到导光板 10的本体 12与涂层 14的界面时， 由于该涂层 14的折射大于或等于 1 , 且小于本体 12的折射 率， 所以在此界面， 光线从光密介质到光疏介质， 当光线的入射角大于全 反射的临界角时会发生全反射。 以该涂层 14的折射率为 1.05为例， 导光 板 10的本体 12的材质为 PMMA, 其临界角为 44.8度， 而 PMMA与空气 的全反射临界角为 42.2度， 因此仅有 42.2度与 44.8度之间的空闲可以射 出， 相对比例较小， 因此可有效减少光漏， 保证导光板 10 的光照强度及 光照均勾度。 请参阅图 7 , 同时参阅图 5 , 本发明一实施例的具有上述导 光板的背光模组， 包括： 背板 2、 设于背板 2 内背光源 4、 设于背板 2 内 的反射片 6、 设于反射片 6上的导光板 10、 设于导光板 10上的光学膜片 组 8及设于背板 2上的胶框 9, 所述导光板 10包括本体 12及设于本体 12 上的涂层 14, 所述本体 12包括底面 122、 与底面 122对应的顶面 124及 位于底面 122与顶面 124之间的数个侧面 126, 所述涂层 14设于该顶面 124的至少一侧边上， 所述涂层 14的折射率小于本体 12的折射率， 且该 涂层 14 的折射率近似等于空气的折射率， 所述光学膜片组 8设于所述涂 层 14上， 背光源 4于背板 2内与导光板 10的侧面 126呈相对设置， 涂层 14于导光板 10本体 12顶面 124上的范围在胶框 9于导光板 10上方的压 附范围内。
所述涂层 14采用折射率小于本体 12的折射率， 且近似等于空气的折 射率的材料制成。 涂层 14可采用印刷或喷涂等方式形成于导光板 10本体 12顶面 124上。 所述导光板 10本体 12的材质为 PMMA (聚甲基丙烯酸 甲酯） 、 MS (苯乙烯 -甲基丙烯酸甲酯）或 PC (聚碳酸酯）等， 其折射率 为 1.49~1.57。
在本实施例中， 所述涂层 14 与顶面 124侧边的边缘之间具有一定间 隙， 即涂层 14的外侧边缘 144与顶面 124侧边的边缘之间具有间隙。 优 选地， 所述涂层 14设于顶面 124四周侧边上， 使得涂层 14呈 "口" 字形 设置于导光板 10的本体 12的顶面 124上。 所述胶框 9面对背板 2—侧上 设有挡墙 92, 组合时， 挡墙 92 下端抵靠在导光板 10 本体 12顶面 124 上， 主要抵靠在涂层 14外侧边缘与顶面 124边缘之间的间隙面上， 胶框 9 于导光板 10上方的该端则将导光板 10的涂层 14覆盖， 使得涂层 14内侧 边缘 142不外露于胶框 9覆盖的范围外， 即， 可参考图 7所示， 涂层 14 的内侧边缘 142在竖直方向上位于胶框 9的侧边缘 90的左边。 本发明的 背光模组中， 背光源 4发出的光线自导光板 10侧面 126 中的入光面进入 其中， 而传播到顶面 124 的光线经由涂层 14反射后再进入导光板 10 中 (光线传播方向如箭头所示） ， 避免了该部分光线从导光板 10 直接射入 光学膜片组 8 中， 造成光的损耗， 从而有效的改善背光模组边缘漏光的现 象， 提升模组的光学品级。 请参阅图 8, 同时参阅图 6, 本发明另一实施 例的具有上述导光板 10的背光模组， 包括： 背板 2、 设于背板 2内背光源 4、 设于背板 内的反射片 6、 设于反射片 6上的导光板 10、 设于导光板 10上的光学膜片组 8及设于背板 2上的胶框 9，， 所述导光板 10包括本体 12及设于本体 12上的涂层 14, 所述本体 12包括底面 122、 与底面 122对 应的顶面 124及位于底面 122与顶面 124之间的数个侧面 126 , 所述涂层 14设于该顶面 124的至少一侧边上， 所述涂层 14的折射率小于本体 12的 折射率， 且该涂层 14的折射率近似等于空气的折射率， 所述光学膜片组 8 设于所述涂层 14上， 背光源 4于背板 2内与导光板 10的侧面 126呈相对 设置， 涂层 14于导光板 10本体 12顶面 124上的范围在胶框 9，于导光板 10上方的压附范围内。
所述涂层 14采用折射率小于本体 12的折射率， 且近似等于空气的折 射率的材料制成。 涂层 14可采用印刷或喷涂等方式形成于导光板 10本体 12顶面 124上。 所述导光板 10本体 12的材质为 PMMA (聚甲基丙烯酸 甲酯） 、 MS (苯乙烯 -甲基丙烯酸甲酯）或 PC (聚碳酸酯）等， 其折射率 为 1.49~1.57。
在本实施例中， 所述胶框 9，上不设有挡墙， 所述涂层 14设于顶面 124 侧边的边缘上， 即涂层 14的外侧边缘 144与导光板 10的本体 12的对应 侧边 126在同一竖直平面内。 优选地， 涂层 14设于顶面 124四周侧边的 边缘上， 从而其呈 "口" 字形设置于导光板 10的本体 12的顶面 124上。 涂层 14 的内侧边缘 142位于胶框 9，覆盖的范围内， 即， 可参考图 8 所 示， 涂层 14 的内侧边缘 142在竖直方向上位于胶框 9，的侧边缘 90，的左 边。
在本实施例中， 所述背光模组还包括贴设于导光板 10侧面 126 的侧 反射片 5, 光线经由该侧反射片 5反射后， 再经由涂层 14反射回到导光板 10 中 （光线传播方向如箭头所示 ) , 防止漏光， 进一步提高整个背光模组 的光照强度及均匀度。
综上所述， 本发明的导光板， 通过在顶面设置涂层， 可将由入光面射 入并传播到导光板顶面的光线反射回导光板， 使得该光线在导光板中传 播， 防止漏光， 进而保证该导光板的光照强度及均勾度， 且其制作结构筒 单， 成本低； 本发明的背光模组， 通过顶面上设有涂层的导光板的使用， 有效的改善背光模组边缘漏光的现象， 提升模组的光学品级， 且有利于实 现背光模组的窄边框化。
以上所述， 对于本领域的普通技术人员来说， 可以根据本发明的技术 方案和技术构思作出其他各种相应的改变和变形， 而所有这些改变和变形 都应属于本发明权利要求的保护范围。

Claims

权 利 要 求
1、 一种导光板， 包括： 本体及设于本体上的涂层， 所述本体包括底 面、 与底面对应的顶面及位于底面与顶面之间的数个侧面， 所述涂层设于 该顶面的至少一侧边上， 该涂层的折射率大于或等于 1 , 且小于导光板本 体的折射率。
2、 如权利要求 1 所述的导光板， 其中， 所述涂层与顶面侧边的边缘 之间具有间隙。
3、 如权利要求 1 所述的导光板， 其中， 所述涂层设于顶面侧边的边 缘上。
4、 如权利要求 1 所述的导光板， 其中， 所述涂层的形成方式为印刷 或喷涂。
5、 如权利要求 1 所述的导光板， 其中， 所述本体的材质为 PMMA、 MS、 或 PC, 其折射率为 1.49~1.57。
6、 一种背光模组， 包括： 背板、 设于背板内背光源、 设于背板内的 反射片、 设于反射片上的导光板、 设于导光板上的光学膜片组及设于背板 上的胶框， 所述导光板包括本体及设于本体上的涂层， 所述本体包括底 面、 与底面对应的顶面及位于底面与顶面之间的数个侧面， 所述涂层设于 该顶面的至少一侧边上， 该涂层的折射率大于或等于 1 , 且小于导光板本 体的折射率， 背光源于背板内与导光板侧面呈相对设置。
7、 如权利要求 6 所述的背光模组， 其中， 所述涂层于导光板本体顶 面上的范围在胶框于导光板上方的压附范围内。
8、 如权利要求 6 所述的背光模组， 其中， 所述涂层设于顶面侧边的 边缘上， 或与顶面侧边的边缘之间具有间隙。
9、 如权利要求 6 所述的背光模组， 其中， 所述涂层的形成方式为印 刷或喷涂。
10、 如权利要求 6 所述的背光模组， 其中， 所述本体的材质为 PMMA、 MS、 或 PC, 其折射率为 1.49~1.57。
11、 一种背光模组， 包括： 背板、 设于背板内背光源、 设于背板内的 反射片、 设于反射片上的导光板、 设于导光板上的光学膜片组及设于背板 上的胶框， 所述导光板包括本体及设于本体上的涂层， 所述本体包括底 面、 与底面对应的顶面及位于底面与顶面之间的数个侧面， 所述涂层设于 该顶面的至少一侧边上， 该涂层的折射率大于或等于 1 , 且小于导光板本 体的折射率， 背光源于背板内与导光板侧面呈相对设置；
其中， 所述涂层于导光板本体顶面上的范围在胶框于导光板上方的压 附范围内；
其中， 所述涂层设于顶面侧边的边缘上， 或与顶面侧边的边缘之间具 有间隙；
其中， 所述涂层的形成方式为印刷或喷涂；
其中， 所述本体的材质为 PMMA、 MS、 或 PC , 其折射率为 1.49~1.57。
PCT/CN2012/075271 2012-04-28 2012-05-10 导光板及具有该导光板的背光模组 WO2013159402A1 (zh)

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