WO2018045677A1 - 导光板、背光模组以及显示器 - Google Patents

导光板、背光模组以及显示器 Download PDF

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Publication number
WO2018045677A1
WO2018045677A1 PCT/CN2016/112520 CN2016112520W WO2018045677A1 WO 2018045677 A1 WO2018045677 A1 WO 2018045677A1 CN 2016112520 W CN2016112520 W CN 2016112520W WO 2018045677 A1 WO2018045677 A1 WO 2018045677A1
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WIPO (PCT)
Prior art keywords
light
guide plate
light guide
emitting surface
backlight module
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2016/112520
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English (en)
French (fr)
Inventor
邓天应
潘俊
陈细俊
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Shenzhen TCL New Technology Co Ltd
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Shenzhen TCL New Technology Co Ltd
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Publication date
Application filed by Shenzhen TCL New Technology Co Ltd filed Critical Shenzhen TCL New Technology Co Ltd
Publication of WO2018045677A1 publication Critical patent/WO2018045677A1/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
    • 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
    • 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
    • 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 electrical appliances, and in particular, to a light guide plate, a backlight module, and a display.
  • LED displays have advantages in thickness, picture quality, longevity, energy saving and environmental protection, and gradually replace the traditional CCFL backlight display. As the market competition becomes more and more fierce, LED display thinning products are the main competitive technology points.
  • the backlight module is a key component in the display.
  • the backlight module includes a light source portion, a light guide plate (LGP), a reflective cover and a reflective sheet, and the design of the light guide plate directly affects the size and performance of the display.
  • LGP light guide plate
  • the design of the light guide plate directly affects the size and performance of the display.
  • major manufacturers have been committed to the improvement and innovation of light guides.
  • the light guide plate is designed to be as thin as possible, how to make full use of the light effect is a major technical bottleneck.
  • the following types of light guide plates mainly appear: 1) mirror microstructure + laser formed single convex shape pattern (see Fig. 1a); 2) mirror microstructure + heat Pressing a single concave shape pattern (see Fig. 1b); 3) mirror plane + hot pressed single convex shape pattern (see Fig. 1c); 4) mirror plane + hot pressed single concave shape pattern (see Fig. 1d).
  • These light guide plates have many defects: 1) the light effect utilization is not optimized; and 2) the concave shape pattern design tends to cause the reflective surface to adsorb the reflective sheet and cause the problem of image quality darkness. Therefore, it is required to provide a new light guide plate capable of making full use of light efficiency.
  • a main object of the present invention is to provide a light guide plate which aims to solve the problem that the light effect cannot be fully utilized.
  • a light guide plate provided by the present invention includes a light emitting surface and a reflecting surface disposed opposite to each other and a side surface surrounding the light emitting surface and the reflecting surface, wherein the reflecting surface is provided with a reflector,
  • the reflector includes a protrusion protruding from the reflecting surface and an annular groove disposed around the protrusion and recessed from the reflection surface toward the inside of the light guide plate.
  • the protrusion has a spherical crown shape, and the annular concave shape
  • the concave surface of the groove is provided with a plurality of scattering dots protruding from the concave surface.
  • the scattering mesh point is an annular rib disposed on the concave surface and distributed around the convex block.
  • the height of the annular rib is 10 um to 50 um, and the spacing between adjacent annular ribs is 30 um to 100 um.
  • the annular groove is a circular groove
  • the inner diameter d of the circular groove is 30 um to 100 um
  • the outer diameter D of the circular groove is 50 um to 200 um
  • the protrusion The diameter of the bottom surface is equal to the inner diameter of the annular groove.
  • the concave surface of the annular groove is a curved surface.
  • the reflective surface is provided with a plurality of the reflectors, and the plurality of the reflectors are distributed in an array.
  • one side of the light guide plate is a light incident side, and the further away from the light incident side, the larger the spacing between adjacent reflectors.
  • a plurality of convex bodies protruding from the light-emitting surface are uniformly disposed on the light-emitting surface, and the top of the convex body is an edge or a spherical crown.
  • the spacing between adjacent convex bodies is 50 um to 200 um.
  • the present invention also provides a backlight module including a light source and the above-described light guide plate.
  • the present invention also provides a display comprising a display screen and the backlight module described above.
  • the reflecting surface is provided with a reflector
  • the reflector includes a protrusion protruding from the reflecting surface and an annular groove provided around the protrusion
  • the concave surface of the annular groove is provided with a convex surface from the concave surface. Scattering dots.
  • the light entering the light guide plate encounters the above-mentioned reflector, it repeatedly performs multiple reflections, refractions, and total reflections, and then passes through the multiple repetitions of the reflection sheet disposed on the side of the reflection surface, thereby illuminating the light.
  • the surface is shot to make full use of the light energy to achieve optimal effects and enhance market competitiveness.
  • the cooperation of the annular groove and the convex block can prevent the reflective surface from adsorbing the reflective sheet, and the selection of the reflective sheet is not limited, and the problem of image quality darkness is also avoided.
  • 1a to 1d are cross-sectional views of a prior art light guide plate
  • Figure 2 is a cross-sectional view of the light guide plate of the present invention.
  • Figure 3 is a schematic view showing light propagation in the light guide plate of the present invention.
  • FIG. 4 is a perspective view of a light guide plate of the present invention.
  • first, second, and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.
  • features defining “first” or “second” may include at least one of the features, either explicitly or implicitly.
  • the meaning of "a plurality” is at least two, such as two, three, etc., unless specifically defined otherwise.
  • the terms "connected”, “fixed” and the like should be understood broadly, unless otherwise clearly defined and limited.
  • “fixed” may be a fixed connection, or may be a detachable connection, or may be integrated; It may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship of two elements unless explicitly defined otherwise.
  • the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.
  • the present invention proposes a light guide plate which aims to solve the problem that the light effect cannot be fully utilized.
  • the light guide plate 1 includes a light-emitting surface 3 and a reflective surface 2 disposed opposite to each other, and a side surface (not labeled) surrounding the light-emitting surface 3 and the reflective surface 2, wherein A reflecting body (not shown) is disposed on the reflecting surface 2, and the reflecting body includes a protrusion 22 protruding from the reflecting surface 2 and an annular groove 21 disposed around the protrusion 22 and recessed from the reflecting surface 2 toward the inside of the light guiding plate 1, As shown in FIG. 2, the bump 22 protrudes from the reflecting surface 2 by a certain height h.
  • the light emitted from the light source 5 enters the light guide plate, and when the reflector is encountered, multiple repeated reflections, refractions, and total reflections are performed, and then the reflection sheet 6 (reflection sheet) is passed.
  • 6 is disposed on the side of the reflecting surface 2 for repeated use, thereby emitting light from the light emitting surface, so that the light energy is fully utilized to achieve an optimized effect and enhance market competitiveness.
  • the cooperation of the annular groove 21 and the bump 22 can prevent the reflective surface 2 from adsorbing the reflection sheet 6, and the selection of the reflection sheet 6 is not limited, and the problem of image quality shadow is also avoided.
  • the thickness of the light guide plate is 2 mm or less
  • the reflector is formed on the light guide plate 1 by hot pressing, and is used in comparison with the single convex/concave shape formed by laser forming on the thinned light guide plate.
  • the reflector is formed by a hot pressing method, and a light guide plate having excellent optical stability can be obtained, and the light guide plate forming the above reflector by hot pressing has a high output.
  • the bump 22 has a spherical crown shape, and the spherical crown refers to a curved surface left after the spherical surface is cut by a plane.
  • the plane is called a clipping plane, and the circular plane intercepted by the plane of the sphere is The bottom surface of the spherical cap, and the maximum distance from the intercepted spherical surface to the bottom surface is high, and the height of the spherical cap (ie, the convex block 22) is marked h in FIG. Referring to FIG.
  • the light is refracted in the bump 22 so as to be able to cooperate with the reflection sheet 6 and the annular groove 21 to change the propagation direction of the light multiple times, thereby improving the utilization effect of the light energy.
  • the bumps 22 can also have other shapes, such as a column shape, a cone shape, and the like.
  • the height h of the bump 22 may be equal to or smaller than the radius of the spherical surface where the spherical cap is located, and the height h of the bump 22 is 3 um to 10 um.
  • the height h of the bump 22 may be determined according to actual needs, and is convex in the above embodiment.
  • the height h of the block 22 is preferably 5 um to 8 um.
  • the concave surface of the annular groove 21 may be a curved or concave cross section having a "concave" shape or the like.
  • the concave surface of the annular groove 21 is a curved surface
  • the cross section of the reflective body is shown in FIG. It can be seen from FIG. 2 that the cross-sectional contour of the reflector is a wavy line, and the cross-sectional contour of the annular groove 21 is an upwardly fluctuating curve in FIG. 2, and the cross-sectional contour of the projection 22 is in FIG. A curve that fluctuates downward.
  • the concave surface of the annular groove 21 is provided with a plurality of scattering mesh points (not labeled) protruding from the concave surface, and the scattering mesh points are rings disposed on the concave surface of the annular groove 21 and distributed around the convex blocks
  • the ribs, the cross sections of the plurality of annular ribs are collectively formed in a zigzag shape (the sawtooth structure on the annular groove 21 in FIG.
  • the scattering mesh point ie, the annular rib
  • the distance between adjacent scatter dots is 10um ⁇ 100um
  • the distance between 30um ⁇ 100um is 30um ⁇ 100um.
  • the annular groove 21 is preferably a circular groove having an inner diameter d of 30 um to 100 um and an outer diameter D of 50 um to 200 um.
  • the inner diameter d of the annular groove and the diameter of the bottom surface of the spherical crown 22 are preferably equal, that is, the spherical crown-shaped bump 22 and
  • the annular grooves are connected to realize a rounded transition of the spherical crown 22 and the circular groove, and in other embodiments, the inner diameter d of the circular groove may be larger than the spherical crown 22
  • the diameter of the bottom surface, the spherical crown 22 and the circular groove may not be in contact with each other, and the relatively thinner light guide plate 1 selects the reflector 22 and the circular groove to meet the reflector better, convex
  • the connection of the block 22 to the annular groove is advantageous for enhancing the shielding effect of
  • the inner diameter d and the outer diameter D of the annular groove can be determined according to actual conditions.
  • the inner diameter d of the annular groove is preferably 50 um to 80 um, and the outer diameter D is preferably 80 um.
  • the outer diameter D must be greater than the inner diameter d.
  • the reflective surface 2 is provided with a plurality of reflectors.
  • the reflectors may be distributed in a variety of forms, for example, a random distribution or an array distribution.
  • the random distribution may be distributed such that the sizes of the reflectors are the same but the pitches of the adjacent reflectors are different, or the reflectors have different sizes but the adjacent reflectors have the same pitch.
  • the distribution may be such that the sizes of the reflectors are different and the pitches of adjacent reflectors are also different.
  • the array distribution may be a rectangular array distribution, a circular array distribution, or an interlaced distribution of reflectors in adjacent rows and columns.
  • the distribution form of the reflector can be determined according to actual conditions, and in the above embodiment, the plurality of reflectors are preferably distributed in an array.
  • one side of the light guide plate 1 is the light incident side 4, and the farther away from the light side 4, the larger the spacing between adjacent reflectors is, the more the reflectors near the light source 5 are distributed relative to each other in consideration of the propagation characteristics of the light. It is dense, so that the utilization of light energy can be fully enhanced.
  • the pitch P1 between adjacent annular grooves 21 is ⁇ P2 ⁇ P3 ⁇ ... ⁇ Pn.
  • the spacing between adjacent reflectors can be determined according to the actual situation.
  • the light-incident side 4 of the light guide plate 1 is opposite to the light-emitting side, and in the preferred embodiment, the two adjacent annular grooves 21 of the light-emitting side are The distance between the outer rings is greater than 15 um, that is, the spacing between adjacent annular grooves 21 on the light exiting side is greater than 65 um to 215 um.
  • the light-emitting surface 3 is uniformly provided with a plurality of convex bodies 31 protruding from the light-emitting surface, and the top of the convex body is an angular or spherical crown (the spherical surface is intercepted by a plane)
  • the part is called the spherical crown, the spherical crown is the geometrical shape of the spherical crown and the cut circular bottom surface), wherein the light-emitting surface 3 and the convex body are connected to the root of the convex body, and the top of the convex body It refers to the portion of the convex body that is away from the light-emitting surface 3, and the top and the root are opposite ends of the convex body.
  • the convex body 31 may be a pyramid shape which is erected on the light-emitting surface 3, or may be a prism which is horizontally disposed on the light-emitting surface 3 (preferably a triangular prism, and the horizontal direction means that the edge of the prism is arranged in parallel with the light-emitting surface 3). Therefore, the light is reflected and refracted repeatedly by the micro-convex body 31 provided on the light-emitting surface 3 and the small-pitch reflector on the reflecting surface, thereby achieving the optimization effect of the light effect utilization.
  • the convex body 31 or the spherical body may be randomly distributed on the light-emitting surface 3 or may be arranged in an array on the light-emitting surface 3, and the pitch Pc between the adjacent convex bodies 31 is 50 ⁇ m. ⁇ 200um, the height H of the convex body 31 is 3um ⁇ 10um, and the height H and the pitch Pc of the convex body 31 can be determined according to actual needs. In the above embodiment, the height H of the convex body 31 is preferably 5um ⁇ 8um. And the pitch Pc is preferably 100 um to 160 um.
  • a thin light guide plate with high light efficiency, uniform light guiding, high output, no pollution, and good optical stability can be obtained.
  • the light shielding plate has a good concealing function (that is, the effect of eliminating the shadow is good), and solves the problem of high defect rate of the ordinary light guiding plate.
  • the present invention further provides a backlight module, wherein the backlight module includes a light source 5, a reflective sheet 6, and the above-mentioned light guide plate.
  • the light emitted from the light source 5 enters the light guide plate, and when it encounters the reflector on the light guide plate, it repeatedly performs repeated reflection, refraction, and total reflection, and then passes through the reflection sheet 6 (the reflection sheet 6 is disposed on the reflection surface 2)
  • the use of multiple repetitions of the side thereby emitting light from the light exit surface, so that the light energy is fully utilized to achieve an optimized effect.
  • the cooperation of the annular groove 21 and the bump 22 can prevent the reflective surface 2 from adsorbing the reflection sheet 6, and the selection of the reflection sheet 6 is not limited, and the problem of image quality shadow is also avoided.
  • the present invention also provides a display, wherein the display comprises a display screen and the above-mentioned backlight module and the like.
  • the use of the thinned light guide plate makes the backlight module correspondingly thinner, thereby affecting the shape and size of the display, making the display thinner and more popular among users.

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

Abstract

一种导光板（1），包括相互背对设置的出光面（3）和反射面（2）以及环绕出光面（3）与反射面（2）的侧面，反射面（2）上设置有反射体，反射体包括从反射面（2）凸出的凸块（22）以及环绕凸块（22）设置且从反射面（2）向导光板的内部凹陷的环形凹槽（21），凸块（22）呈球冠形，环形凹槽（21）的凹面上设置有从凹面凸出的多个散射网点。

Description

导光板、背光模组以及显示器
技术领域
本发明涉及电器领域，尤其涉及一种导光板、背光模组以及显示器。
背景技术
随着经济的发展，人们生活水平提高，各种电器产品（例如，电视机、电脑等）已经融入了我们的生活，而电器产品上的显示器是影响电器产品的尺寸、性能以及用户体验的关键因素，显示器从而成为用户挑选电器产品时关注的焦点。其中，LED显示器在厚度、画面质量、寿命以及节能环保上具有优势，逐渐取代了传统的CCFL背光显示器，随着市场竞争越来越激烈，LED显示器薄化产品是主要的竞争技术点。
其中，背光模组是显示器中的关键部件，背光模组包括光源部、导光板（LGP）、反射罩和反射片等，而导光板的设计将直接影响显示器的尺寸和性能。为了争夺市场份额，各大生产厂家一直致力于导光板的改进和创新。然而，导光板在尽可能的超薄化设计之后，怎样将光效充分利用是一个主要的技术瓶颈。
目前，为了解决薄型化导光板光效利用的问题，主要出现以下几种导光板：1）镜面微结构+镭射成型单凸形状pattern（图案）（参见图1a）；2）镜面微结构+热压单凹形状pattern（参见图1b）；3）镜面平面+热压单凸形状pattern（参见图1c）；4）镜面平面+热压单凹形状pattern（参见图1d）。而这些导光板存在有很多缺陷：1）光效利用未达到最佳化；以及，2）凹形状pattern设计容易使反射面吸附反射片而导致出现画质暗影的问题。因此，需要提供一种能够将光效充分利用的新的导光板。
发明内容
本发明的主要目的是提供一种导光板，旨在解决不能充分利用光效的问题。
为实现上述目的，本发明提出的导光板包括相互背对设置的出光面和反射面以及环绕所述出光面与所述反射面的侧面，其中，所述反射面上设置有反射体，所述反射体包括从所述反射面凸出的凸块以及环绕所述凸块设置且从所述反射面向所述导光板的内部凹陷的环形凹槽所述凸块呈球冠形，所述环形凹槽的凹面上设置有从所述凹面凸出的多个散射网点。
优选地，所述散射网点为设置于所述凹面上且环绕所述凸块分布的环形凸棱。
优选地，所述环形凸棱的高度为10um~50um，相邻所述环形凸棱之间的间距为30um~100um。
优选地，所述环形凹槽为圆环形凹槽，所述圆环形凹槽的内径d为30um~100um，所述圆环形凹槽的外径D为50um~200um，所述凸块的底面直径与所述圆环形凹槽的内径相等。
优选地，所述环形凹槽的凹面为曲面。
优选地，所述反射面上设置有多个所述反射体，多个所述反射体呈阵列分布。
优选地，所述导光板的一个侧面为入光侧，离所述入光侧越远，相邻的所述反射体之间的间距越大。
优选地，所述出光面上均匀设置有从所述出光面上凸出的多个凸状体，所述凸状体的顶部为棱角或者球冠。
优选地，相邻的所述凸状体之间的间距为50um~200um。
另外，本发明还提供一种背光模组，其包括光源和上述的导光板。
进一步地，本发明还提供一种显示器，其包括显示屏和上述的背光模组。
本发明技术方案中，反射面上设置有反射体，反射体包括从反射面凸出的凸块以及环绕凸块设置的环形凹槽，并且环形凹槽的凹面上设置有从凹面凸出的多个散射网点。进入到导光板的光线在遇到上述反射体时，会进行多次重复的反射、折射和全反射，再通过设置于反射面一侧的反射片的多次重复的利用，从而将光由出光面射出，使光能量得到充分利用，以达到最佳化的效果，提升市场竞争力。并且，环形凹槽与凸块的配合能够防止反射面吸附反射片，反射片的选型不受限制，也避免了出现画质暗影的问题。
附图说明
为了更清楚地说明本发明实施方式或现有技术中的技术方案，下面将对实施方式或现有技术描述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，还可以根据这些附图示出的结构获得其他的附图。
图1a至图1d为现有技术的导光板的剖视图；
图2为本发明的导光板的剖视图；
图3为在本发明的导光板中光线传播的示意图；
图4为本发明的导光板的立体图。
附图标号说明：
标号 名称 标号 名称
1 导光板 2 反射面
3 出光面 4 入光侧
5 光源 6 反射片
22 凸块 21 环形凹槽
31 凸状体
本发明目的的实现、功能特点及优点将结合实施方式，参照附图做进一步说明。
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，显然，所描述的实施方式仅仅是本发明的一部分实施方式，而不是全部的实施方式。基于本发明中的实施方式，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施方式，都属于本发明保护的范围。
需要说明，本发明实施方式中所有方向性指示（诸如上、下、左、右、前、后……）仅用于解释在某一特定姿态（如附图所示）下各部件之间的相对位置关系、运动情况等，如果该特定姿态发生改变时，则该方向性指示也相应地随之改变。
另外，在本发明中如涉及“第一”、“第二”等的描述仅用于描述目的，而不能理解为指示或暗示其相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括至少一个该特征。在本发明的描述中，“多个”的含义是至少两个，例如两个，三个等，除非另有明确具体的限定。
在本发明中，除非另有明确的规定和限定，术语“连接”、“固定”等应做广义理解，例如，“固定”可以是固定连接，也可以是可拆卸连接，或成一体；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系，除非另有明确的限定。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
另外，本发明各个实施方式之间的技术方案可以相互结合，但是必须是以本领域普通技术人员能够实现为基础，当技术方案的结合出现相互矛盾或无法实现时应当认为这种技术方案的结合不存在，也不在本发明要求的保护范围之内。
本发明提出一种导光板，旨在解决不能充分利用光效的问题。
请参照图2和图4，在本发明一种实施方式中，导光板1包括相互背对设置的出光面3和反射面2以及环绕出光面3与反射面2的侧面（未标示），其中，反射面2上设置有反射体（未标示），反射体包括从反射面2凸出的凸块22以及环绕凸块22设置且从反射面2向导光板1的内部凹陷的环形凹槽21，如图2所示，凸块22从反射面2上凸出一定高度h。
本发明技术方案中，如图3所示，从光源5射出的光线进入导光板在遇到上述反射体时，会进行多次重复的反射、折射和全反射，再通过反射片6（反射片6设置于反射面2一侧）的多次重复利用，从而将光由出光面射出，使光能量得到充分利用，以达到最佳化的效果，提升市场竞争力。并且，环形凹槽21与凸块22的配合能够防止反射面2吸附反射片6，反射片6的选型不受限制，也避免了出现画质暗影的问题。
其中，在上述实施方式中，导光板的厚度在2mm以下，而反射体通过热压方式形成于导光板1上，与在薄型化导光板上通过镭射成型单凸/凹形状体相比，采用热压方式形成反射体，能够获得光学稳定性好的导光板，且通过热压方式形成上述反射体的导光板具有较高的产出。
在优选的实施方式中，凸块22呈球冠形，球冠是指一个球面被平面所截后剩下的曲面，该平面称为截取平面，球体上被截取平面所截取的圆形平面是球冠的底面，而截取的球面上到底面的最大距离为高，在图2中球冠（即凸块22）的高标记为h。参见图3，光线在凸块22内发生折射，从而能够与反射片6、环形凹槽21配合而多次改变光线的传播方向，而提升对光能量的利用效果。当然，凸块22还可以为其他的形状，例如，柱状、锥状等。其中，凸块22的高度h可以等于或小于球冠所在的球面的半径，凸块22的高度h为3um~10um，凸块22的高度h可以根据实际需要确定，在上述的实施方式中凸块22的高度h优选为5um~8um。
另外，环形凹槽21的凹面可以为曲面或者凹面的横截面呈“凹”字型等，在优选的实施方式中，环形凹槽21的凹面为曲面，图2中表示了反射体的横截面，从图2中可以看出反射体的横截面轮廓线呈波浪线，而环形凹槽21的横截面轮廓线是图2中向上波动的曲线，凸块22的横截面轮廓线是图2中向下波动的曲线。为了进一步增加光线的折射效果，环形凹槽21的凹面上设置有从凹面凸出的多个散射网点（未标示），散射网点为设置于环形凹槽21的凹面上且环绕凸块分布的环形凸棱，多条环形凸棱的横截面共同形成为锯齿状（图2中环形凹槽21上的锯齿结构），散射网点（即环形凸棱）从环形凹槽21的凹面上凸出的高度为10um~50um，相邻散射网点（即环形凸棱）之间的间距为30um~100um。参见图3，散射网点向外凸出，光线在散射网点上发生折射，从而能够与反射片6、凸块22配合而多次改变光线的传播方向，而提升对光能量的利用效果，以突破薄化型导光板的技术瓶颈。
在上述的实施方式中，环形凹槽21优选为圆环形凹槽，圆环形凹槽的内径d为30um~100um，外径D为50um~200um。其中，圆环形凹槽的内径d与球冠形的凸块22的底面直径（球冠的底面直径是指球冠的底面的直径）优选为相等，即，球冠形的凸块22与圆环形凹槽相接而实现球冠形的凸块22与圆环形凹槽圆滑过渡，而在其他的实施方式中，圆环形凹槽的内径d可以大于球冠形的凸块22的底面直径，球冠形的凸块22与圆环形凹槽可以不相接，而厚度相对较薄的导光板1选择凸块22与圆环形凹槽相接的反射体较好，凸块22与圆环形凹槽相接有利于提升反射体的遮蔽效果，进而提升导光板1的导光效果。其中，圆环形凹槽的内径d与外径D均可以根据实际情况进行确定，而在上述的实施方式中圆环形凹槽的内径d优选为50um~80um，外径D优选为80um~150um，当然在一个圆环形凹槽中，外径D必然会大于内径d。
进一步地，反射面2上设置有多个反射体，在具体的实施方式中，反射体的分布形式可以有很多种，例如，随机分布或者阵列分布等。具体地，随机分布还可以是以反射体的尺寸相同但相邻的反射体的间距不同的方式进行分布，或者是以反射体的尺寸不同但相邻的反射体的间距相同的方式进行分布，亦或者是以反射体的尺寸不同同时相邻的反射体的间距也不同的方式进行分布。其中，阵列分布可以是矩形阵列分布、环形阵列分布或者相邻行列内反射体交错分布等。反射体的分布形式可以根据实际情况进行确定，而在上述的实施方式中多个反射体优选呈阵列分布。
另外，导光板1的一个侧面为入光侧4，考虑到光线的传播特性，离入光侧4越远，相邻的反射体之间的间距越大，靠近光源5的反射体分布得相对密集，从而能够充分地提升对光能量的利用效果。如图2所示，相邻环形凹槽21之间的间距P1＜P2＜P3＜...＜Pn。其中，相邻的反射体之间的间距均可以根据实际情况进行确定，导光板1上入光侧4与出光侧相对，而在优选的实施方式中出光侧的两相邻环形凹槽21的外环相隔距离大于15um即可，即在出光侧相邻环形凹槽21之间的间距大于65um~215um。
进一步地，在优选的实施方式中，出光面3上均匀设置有从所述出光面上凸出的多个凸状体31，凸状体的顶部为棱角或者球冠（球面被平面所截得的一部分叫做球冠，球冠体就是球冠和截得的圆形底面组成的几何图形），其中，出光面3与凸状体相接处为凸状体的根部，而凸状体的顶部是指凸状体上远离出光面3的部分，顶部与根部为凸状体的相对两端。凸状体31可为直立设置于出光面3上的棱锥形状，也可为横置于出光面3上的棱柱（优选为三棱柱，横置是指棱柱的棱与出光面3平行设置），从而让光线通过出光面3带有的微型的凸状体31和反射面上的小间距的反射体进行多次重复的反射和折射，从而达到光效利用的最佳化效果。其中，在其他实施方式中，凸状体31或者球冠体可在出光面3上随机分布，也可以在出光面3上呈阵列分布，相邻的凸状体31之间的间距Pc为50um~200um，凸状体31的高度H为3um~10um，凸状体31的高度H以及间距Pc可以根据实际需要确定，在上述的实施方式中凸状体31的高度H优选为5um~8um，且间距Pc优选为100um~160um。
通过本发明的技术方案，可以得到高光效、导光均匀、高产出、无污染、光学稳定性佳的薄型化导光板。而且，这种导光板的遮瑕功能佳（即消除暗影的效果好），解决普通导光板的不良率高的问题。通过使导光板产品的形态更加薄型化，同时解决薄型化导光板的光学利用效果不佳的问题，从而能够大幅度提升生产厂家的市场竞争力。
另外，本发明还提供一种背光模组，其中，背光模组包括光源5、反射片6以及上述的导光板等。从光源5射出的光线进入导光板内，在遇到导光板上的反射体时，会进行多次重复的反射、折射和全反射，再通过反射片6（反射片6设置于反射面2一侧）的多次重复的利用，从而将光由出光面射出，使光能量得到充分利用，以达到最佳化的效果。并且，环形凹槽21与凸块22的配合能够防止反射面2吸附反射片6，反射片6的选型不受限制，也避免了出现画质暗影的问题。通过使导光板产品的形态更加薄型化，同时解决薄型化导光板的光学利用效果不佳的问题，从而能够大幅度提升生产厂家的市场竞争力。
进一步地，本发明还提供一种显示器，其中，显示器包括显示屏以及上述的背光模组等。薄型化导光板的使用使背光模组也相应地更加薄型化，进而影响显示器的形态和尺寸，使得显示器也更加薄型化，而更受广大用户的喜爱。
以上所述仅为本发明的优选实施方式，并非因此限制本发明的专利范围，凡是在本发明的发明构思下，利用本发明说明书及附图内容所作的等效结构变换，或直接/间接运用在其他相关的技术领域均包括在本发明的专利保护范围内。

Claims (20)

  1. 一种导光板，所述导光板包括相互背对设置的出光面和反射面以及环绕所述出光面与所述反射面的侧面，其特征在于，所述反射面上设置有反射体，所述反射体包括从所述反射面凸出的凸块以及环绕所述凸块设置且从所述反射面向所述导光板的内部凹陷的环形凹槽，所述凸块呈球冠形，所述环形凹槽的凹面上设置有从所述凹面凸出的多个散射网点。
  2. 如权利要求1所述的导光板，其特征在于，所述散射网点为设置于所述凹面上且环绕所述凸块分布的环形凸棱。
  3. 如权利要求2所述的导光板，其特征在于，所述环形凸棱的高度为10um~50um，相邻所述环形凸棱之间的间距为30um~100um。
  4. 如权利要求1所述的导光板，其特征在于，所述环形凹槽为圆环形凹槽，所述圆环形凹槽的内径d为30um~100um，所述圆环形凹槽的外径D为50um~200um，所述凸块的底面直径与所述圆环形凹槽的内径d相等。
  5. 如权利要求1所述的导光板，其特征在于，所述环形凹槽的凹面为曲面，所述反射面上设置有多个所述反射体，多个所述反射体呈阵列分布。
  6. 如权利要求5所述的导光板，其特征在于，所述导光板的一个侧面为入光侧，离所述入光侧越远，相邻的所述反射体之间的间距越大。
  7. 如权利要求1所述的导光板，其特征在于，所述出光面上均匀设置有从所述出光面上凸出的多个凸状体，所述凸状体的顶部为棱角或者球冠。
  8. 如权利要求2所述的导光板，其特征在于，所述出光面上均匀设置有从所述出光面上凸出的多个凸状体，所述凸状体的顶部为棱角或者球冠。
  9. 如权利要求3所述的导光板，其特征在于，所述出光面上均匀设置有从所述出光面上凸出的多个凸状体，所述凸状体的顶部为棱角或者球冠。
  10. 如权利要求4所述的导光板，其特征在于，所述出光面上均匀设置有从所述出光面上凸出的多个凸状体，所述凸状体的顶部为棱角或者球冠。
  11. 如权利要求5所述的导光板，其特征在于，所述出光面上均匀设置有从所述出光面上凸出的多个凸状体，所述凸状体的顶部为棱角或者球冠。
  12. 如权利要求6所述的导光板，其特征在于，所述出光面上均匀设置有从所述出光面上凸出的多个凸状体，所述凸状体的顶部为棱角或者球冠。
  13. 如权利要求6所述的导光板，其特征在于，相邻的所述凸状体之间的间距为50um~200um。
  14. 一种背光模组，其特征在于，所述背光模组包括光源和权利要求1所述的导光板。
  15. 一种背光模组，其特征在于，所述背光模组包括光源和权利要求3所述的导光板。
  16. 一种背光模组，其特征在于，所述背光模组包括光源和权利要求4所述的导光板。
  17. 一种背光模组，其特征在于，所述背光模组包括光源和权利要求6所述的导光板。
  18. 一种背光模组，其特征在于，所述背光模组包括光源和权利要求7所述的导光板。
  19. 一种背光模组，其特征在于，所述背光模组包括光源和权利要求13所述的导光板。
  20. 一种显示器，其特征在于，所述显示器包括显示屏和权利要求14所述的背光模组。
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CN109358389B (zh) * 2018-10-30 2024-03-22 东莞市谷麦光学科技有限公司 一种手机导光组件
CN115621071A (zh) * 2022-09-09 2023-01-17 苏州昌利橡塑科技有限公司 应用于发光键盘的背光模块

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