WO2015014052A1 - 复合导光板及其制造方法、背光模组、显示装置 - Google Patents

复合导光板及其制造方法、背光模组、显示装置 Download PDF

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Publication number
WO2015014052A1
WO2015014052A1 PCT/CN2013/088104 CN2013088104W WO2015014052A1 WO 2015014052 A1 WO2015014052 A1 WO 2015014052A1 CN 2013088104 W CN2013088104 W CN 2013088104W WO 2015014052 A1 WO2015014052 A1 WO 2015014052A1
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WO
WIPO (PCT)
Prior art keywords
light guide
guide plate
layer
backlight module
composite light
Prior art date
Application number
PCT/CN2013/088104
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English (en)
French (fr)
Inventor
姜太声
权宁万
Original Assignee
北京京东方光电科技有限公司
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Publication of WO2015014052A1 publication Critical patent/WO2015014052A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00663—Production of light guides
    • 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
    • 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
    • G02B6/0051—Diffusing 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
    • G02B6/005—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
    • G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
    • 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
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/12—Materials and properties photoconductor

Definitions

  • the invention relates to a composite light guide plate and a manufacturing method thereof, a backlight module provided with the composite light guide plate, and a display device provided with the backlight module. Background technique
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • the backlight module is an important component in the TFT-LCD and is used to provide a uniform surface light source for the TFT-LCD.
  • Current backlight modules generally include a reflector, a light guide plate, a diffuser plate, a lower prism plate, and an upper prism plate disposed in order from bottom to top, and a light source is disposed on a side of the light guide plate.
  • the inventors have found that at least the following problems exist in the prior art: In the assembly process of the existing backlight module, it is necessary to assemble a reflector, a light guide plate, a diffusion plate, a lower prism plate, an upper prism plate, and the like. The assembly process is complicated and the assembly efficiency is low. In addition, as TFT-LCDs are gradually becoming thinner, the light guide plates in the backlight modules of TFT-LCDs are becoming thinner and thinner. In the reliability test of the backlight module, and during the use of the product, the thin light guide plate having a small thickness is easily deformed by heat, causing a gap between the light guide plate and the diffusion plate, which causes light leakage and affects the quality of the product. Summary of the invention
  • the embodiment of the invention provides a composite light guide plate and a manufacturing method thereof, a backlight module provided with the composite light guide plate, and a display device provided with the backlight module, which solves the assembly efficiency of the existing backlight module Low, and existing thin light guide plates are susceptible to thermal deformation, which affects the technical quality of the product.
  • the invention provides a composite light guide plate, comprising a light guiding layer, and a diffusion layer formed above the light guiding layer;
  • the lower surface of the light guiding layer is a reflective surface.
  • the reflective surface has a plurality of convex or concave reflective structures.
  • the reflective structure has a semicircular, semi-elliptical or polygonal cross section.
  • the invention also provides a backlight module comprising a light source, and the composite light guide plate, wherein the light source is disposed on a side of the light guiding layer of the composite light guide plate.
  • a reflective plate is further disposed under the composite light guide plate, and at least one prism plate is disposed on the composite light guide plate.
  • the light source is a light emitting diode.
  • the invention also provides a display device comprising the above backlight module.
  • the present invention also provides a method of manufacturing a composite light guide plate, the manufacturing method using the injection mold to manufacture the composite light guide plate, the injection mold comprising a fixed mold, a movable mold, a first syringe and a second syringe, the manufacturing method Includes:
  • the first layer and the second layer are respectively a light guiding layer and a diffusion layer, or the first layer and the second layer are respectively a diffusion layer and a light guiding layer.
  • the surface of the movable mold or the fixed mold has a concave-convex structure, and a light-reflecting layer is formed on the lower surface of the light guiding layer while forming a light guiding layer.
  • the above technical solution provided by the present invention has the following advantages: the light guiding layer in the composite light guiding plate can diffusely reflect the light emitted by the light source located on the side of the light guiding layer to form a surface light source; the composite light guiding plate The diffusion layer in the middle can diffuse the light reflected by the light guiding layer to form a more uniform surface light source. Therefore, in the assembly process of the backlight module, after assembling the composite light guide plate provided by the present invention, the diffusion plate is not required to be installed, thereby eliminating the process of installing the diffusion plate and improving the assembly efficiency of the backlight module.
  • the composite light guide plate provided by the present invention is composed of a light guiding layer and a diffusion layer, so that the thickness thereof is larger than that of the existing thin light guide plate.
  • the composite light guide plate provided by the present invention has a large thickness, it is not easily deformed by heat. Thereby improving the quality of the product.
  • FIG. 1 is a schematic view of a composite light guide plate according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of a backlight module according to Embodiment 2 of the present invention.
  • FIG. 3 is a schematic view showing an injection mold in a method of manufacturing a composite light guide plate according to Embodiment 4 of the present invention.
  • Fig. 4 is a schematic view showing an injection mold in a method of manufacturing a composite light guide plate according to Embodiment 5 of the present invention. detailed description
  • a composite light guide plate includes a light guiding layer 11 and a diffusion layer 12 formed on the light guiding layer 11, and a lower surface of the light guiding layer 11 is a reflective surface.
  • the light guiding layer 11 in the composite light guide plate can diffusely reflect the light emitted from the light source located on the side of the light guiding layer 11 to form a surface light source; the diffusion layer 12 in the composite light guiding plate can diffuse the light emitted by the light guiding layer 11 .
  • a more uniform surface source is formed. Therefore, in the assembly process of the backlight module, after the composite light guide plate provided by the embodiment of the present invention is assembled, the diffusion plate is not required to be installed, thereby eliminating the process of installing the diffusion plate and improving the assembly efficiency of the backlight module. .
  • the composite light guide plate provided by the embodiment of the invention is composed of the light guiding layer 11 and the diffusion layer 12, so the thickness thereof is larger than that of the existing thin light guide plate.
  • the thickness of the composite light guide plate provided by the embodiment of the present invention is large, it will not It is easily deformed by heat, which improves the quality of the product.
  • a reflective structure (not shown) having a plurality of protrusions or depressions on the reflective surface is used for diffuse reflection of light emitted from the light source.
  • the cross section of the retroreflective structure is preferably semi-circular, semi-elliptical, or triangular, square, or the like.
  • an embodiment of the present invention provides a backlight module including a light source 2, and the composite light guide plate 1 provided in Embodiment 1 above.
  • the light source 2 is preferably a light emitting diode (LED) which is disposed on the side of the light guiding layer 11 of the composite light guiding plate 1.
  • LED light emitting diode
  • a reflector 3 is disposed under the composite light guide plate 1, and at least one prism plate is disposed above the composite light guide plate 1.
  • the prism plate functions to concentrate the emitted light as much as possible in the display direction to increase the display brightness.
  • the lower prism plate 4 and the upper prism plate 5 are disposed above the composite light guide plate 1. In other embodiments, only one layer of prism plates may be disposed above the composite light guide plate.
  • the light guiding layer 11 in the composite light guiding plate 1 can diffusely reflect the light emitted by the light source 2, and the incident light is conducted in the light guiding layer 11 to form a surface light source; the diffusion layer 12 in the composite light guiding plate 1 can be opposite to the light guiding layer 11 The reflected light diffuses to form a more uniform surface source. Therefore, in the assembly process of the backlight module provided in this embodiment, after the composite light guide plate 1 is assembled, the diffusion plate is not required to be installed, thereby eliminating the process of installing the diffusion plate and improving the assembly efficiency of the backlight module. .
  • the composite light guide plate 1 in the backlight module is composed of the light guiding layer 11 and the diffusion layer 12, so that the thickness thereof is larger than that of the existing thin light guide plate. In the reliability test of the backlight module, and during the use of the product, since the thickness of the composite light guide plate 1 is large, it is not easily deformed by heat, thereby improving the quality of the product.
  • the embodiment of the invention provides a display device, which comprises the backlight module provided by the above embodiments.
  • the display device may be any product or component having a display function such as a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet, or the like.
  • the embodiment of the invention provides a method for manufacturing the composite light guide plate in the first embodiment.
  • the manufacturing method manufactures a composite light guide plate using an injection mold.
  • the injection mold includes a fixed mold 61, a movable mold 62, a first syringe 631, and a second syringe 632.
  • the manufacturing method of the composite light guide plate comprises:
  • the movable mold 62 is fixed on the base 60 of the injection mold, and the movable mold 62 is moved to the right by the base 60, so that the movable mold 62 and the groove below the fixed mold 61 are closed to form the first empty space. Cavity.
  • a first layer is formed in the first cavity by the first syringe 631.
  • the first syringe 631 can be used to inject liquid material into the first cavity to form a first layer in the first cavity.
  • the light guide layer may be formed first, or the diffusion layer may be formed first.
  • the light guide layer is formed first (that is, the first layer is a light guide layer) as an example.
  • the surface of the movable mold 62 has a concavo-convex structure such that a light guiding layer is formed, and a plurality of convex or concave reflecting structures are formed on the lower surface of the light guiding layer.
  • the movable mold 62 is rotated by 180°.
  • the movable mold 62 can be rotated by the base 60 to rotate with the base 60.
  • the movable mold 62 can also rotate independently, and the base 60 can be kept. Do not move.
  • the movable mold 62 After the movable mold 62 is rotated by 180°, the movable mold 62 and the light guiding layer are moved to the right by the base 60 (ie, the mold is closed), and the light guiding layer and the groove above the fixed mold 61 are clamped to form a second cavity. .
  • a second layer is formed in the second cavity by the second syringe 632.
  • a resin material having a light diffusing property is injected into the second cavity by the second syringe 632, and a second layer, that is, a diffusion layer is formed in the second cavity.
  • the composite light guide plate provided in Embodiment 1 of the present invention can be formed.
  • This embodiment provides another manufacturing method of the composite light guide plate.
  • This embodiment is basically the same as the embodiment 4, and the difference is that: as shown in FIG. 4, in the embodiment, the fixed mode 610 itself forms a large space.
  • the cavity, the movable mold 620 is a slidable push plate.
  • the fixed mold 610 can be divided into a first cavity and a second cavity.
  • the movable mold 620 is moved to the left end, and the second layer is formed in the second cavity by the second syringe 632, thereby forming the first embodiment of the present invention.
  • a composite light guide plate is provided.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Health & Medical Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

一种复合导光板（1）包括导光层（11）,形成在导光层（11）上的扩散层（12）,导光层（11）的下表面为反光面。一种背光模组包括光源（2），以及上述的复合导光板（1），光源（2）设置在复合导光板（1）的导光层（11）的侧面。一种包括上述背光模组的显示装置。一种复合导光板（1）的制造方法，利用注射模具制造所述复合导光板。解决了现有的背光模组的组装效率低，及现有的薄型导光板容易受热变形，影像产品质量的技术问题。可应用于液晶电视、液晶显示器、数码相框、手机、平板电脑等显示装置。

Description

复合导光板及其制造方法、 背光模组、 显示装置 技术领域
本发明涉及一种复合导光板及其制造方法、 设有该复合导光板的背光模 组、 以及设有该背光模组的显示装置。 背景技术
随着显示技术的不断发展， 薄膜晶体管液晶显示器（Thin Film Transistor Liquid Crystal Display, TFT-LCD )具有体积小、 功耗低、 无辐射等优点， 在 平板显示领域中占据了主导地位。 背光模组是 TFT-LCD 中的重要部件， 用 于为 TFT-LCD提供均匀的面光源。 目前的背光模组通常包括由下至上依次 设置的反光板、 导光板、 扩散板、 下棱镜板和上棱镜板， 并且在导光板的侧 面设置有光源。
本发明人在实现本发明的过程中发现， 现有技术至少存在以下问题： 现 有的背光模组的组装过程中， 需要组装反光板、 导光板、 扩散板、 下棱镜板 和上棱镜板等部件，组装过程比较复杂，组装效率较低。此外，随着 TFT-LCD 逐渐向轻薄化的方向发展， TFT-LCD 的背光模组中的导光板也变得越来越 薄。 在背光模组的可靠性测试中， 以及产品的使用过程中， 厚度很小的薄型 导光板很容易受热变形， 使导光板与扩散板之间出现空隙， 而导致漏光， 影 响了产品的质量。 发明内容
本发明实施例提供了一种复合导光板及其制造方法， 设有该复合导光板 的背光模组， 以及设有该背光模组的显示装置， 解决了现有的背光模组的组 装效率较低， 以及现有的薄型导光板容易受热变形， 影响产品质量的技术问 题。
为达到上述目的， 本发明的实施例采用如下技术方案：
本发明提供一种复合导光板， 包括导光层， 以及形成在所述导光层上方 的扩散层； 所述导光层的下表面为反光面。
进一步， 所述反光面上具有若干凸起或凹陷的反光结构。
优选的， 所述反光结构的横截面为半圓形、 半橢圓形或多边形。
本发明还提供一种背光模组， 包括光源， 以及上述的复合导光板， 所述 光源设置在所述复合导光板的导光层的侧面。
进一步， 所述复合导光板的下方还设置有反射板， 所述复合导光板的上 方还设置有至少一层棱镜板。
优选的， 所述光源为发光二极管。
本发明还提供一种显示装置， 包括上述的背光模组。
本发明还提供一种复合导光板的制造方法， 所述制造方法利用注射模具 制造所述复合导光板， 所述注射模具包括定模、 动模、 第一注射器和第二注 射器， 所述制造方法包括：
移动所述动模， 在所述动模与所述定模之间形成第一空腔；
利用所述第一注射器在所述第一空腔中形成第一层；
移动所述动模， 在所述动模上的所述第一层与所述定模之间形成第二空 腔；
利用所述第二注射器在所述第二空腔中形成第二层；
其中， 所述第一层和所述第二层分别为导光层和扩散层， 或， 所述第一 层和所述第二层分别为扩散层和导光层。
进一步， 所述动模或所述定模的表面具有凹凸结构， 使形成导光层的同 时， 在所述导光层的下表面形成若干凸起或凹陷的反光结构。
与现有技术相比， 本发明所提供的上述技术方案具有如下优点： 复合导 光板中的导光层能够对位于导光层侧面的光源发出的光进行漫反射， 形成面 光源； 复合导光板中的扩散层能够对导光层反射出的光进行扩散， 形成更为 均匀的面光源。 因此， 在背光模组的组装过程中， 组装了本发明提供的复合 导光板之后， 就不需要再安装扩散板， 从而省去了安装扩散板的工序， 提高 了背光模组的组装效率。
此外， 本发明提供的复合导光板由导光层和扩散层组成， 所以其厚度大 于现有的薄型导光板。在背光模组的可靠性测试中，以及产品的使用过程中， 由于本发明提供的复合导光板的厚度较大，所以不会轻易因受热而发生变形， 从而提高了产品的质量。 附图说明
为了更清楚地说明本发明实施例的技术方案， 下面将对实施例的附图作 筒单地介绍，显而易见地，下面描述中的附图仅仅涉及本发明的一些实施例， 而非对本发明的限制。
图 1为本发明的实施例 1所提供的复合导光板的示意图；
图 2为本发明的实施例 2所提供的背光模组的示意图；
图 3为本发明的实施例 4所提供的复合导光板的制造方法中注射模具的 示意图；
图 4为本发明的实施例 5所提供的复合导光板的制造方法中注射模具的 示意图。 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。
实施例 1:
如图 1所示，本发明实施例所提供的复合导光板， 包括导光层 11和形成 在导光层 11上的扩散层 12, 导光层 11的下表面为反光面。
复合导光板中的导光层 11能够对位于导光层 11侧面的光源发出的光进 行漫反射， 形成面光源； 复合导光板中的扩散层 12能够对导光层 11射出的 光进行扩散， 形成更为均匀的面光源。 因此， 在背光模组的组装过程中， 组 装了本发明实施例提供的复合导光板之后， 就不需要再安装扩散板， 从而省 去了安装扩散板的工序， 提高了背光模组的组装效率。
此外， 本发明实施例提供的复合导光板由导光层 11和扩散层 12组成， 所以其厚度大于现有的薄型导光板。 在背光模组的可靠性测试中， 以及产品 的使用过程中， 由于本发明实施例提供的复合导光板的厚度较大， 所以不会 轻易因受热而发生变形， 从而提高了产品的质量。
进一步，反光面上具有若干凸起或凹陷的反光结构（图中未示出）， 用于 对光源发出的光进行漫反射。 反光结构的横截面优选为半圓形、 半橢圓形， 或者三角形、 方形等多边形。
实施例 2:
如图 2所示， 本发明实施例提供一种背光模组， 包括光源 2, 以及上述 实施例 1所提供的复合导光板 1。 光源 2优选为发光二极管 （Light Emitting Diode, 筒称 LED ) , 设置在复合导光板 1的导光层 11的侧面。
进一步， 复合导光板 1的下方还设置有反射板 3, 复合导光板 1的上方 还设置有至少一层棱镜板。 棱镜板的作用在于， 使出射光尽可能集中在显示 方向上， 以增大显示亮度。 本实施例中， 复合导光板 1的上方设置有下棱镜 板 4和上棱镜板 5。 在其他实施方式中， 在复合导光板上方也可以只设置一 层棱镜板。
复合导光板 1中的导光层 11能够对光源 2发出的光进行漫反射,入射光 从而在导光层 11中传导形成面光源； 复合导光板 1中的扩散层 12能够对导 光层 11反射出的光进行扩散， 形成更为均匀的面光源。 因此， 在本实施例提 供的背光模组的组装过程中， 组装了复合导光板 1之后， 就不需要再安装扩 散板， 从而省去了安装扩散板的工序， 提高了背光模组的组装效率。
此外， 背光模组中的复合导光板 1由导光层 11和扩散层 12组成， 所以 其厚度大于现有的薄型导光板。 在背光模组的可靠性测试中， 以及产品的使 用过程中， 由于复合导光板 1的厚度较大，所以不会轻易因受热而发生变形， 从而提高了产品的质量。
实施例 3:
本发明实施例提供一种显示装置， 包括上述实施例所提供的背光模组。 该显示装置可以是液晶电视、 液晶显示器、 数码相框、 手机、 平板电脑等任 何具有显示功能的产品或部件。
由于本发明实施例提供的显示装置与上述本发明实施例所提供的背光模 组及复合导光板具有相同的技术特征， 所以也能产生相同的技术效果， 解决 相同的技术问题。 本发明实施例提供了上述实施例 1中的复合导光板的制造方法。 该制造 方法利用注射模具制造复合导光板， 如图 3所示， 该注射模具包括定模 61、 动模 62、 第一注射器 631和第二注射器 632。
该复合导光板的制造方法包括：
S1 : 移动动模 62, 在动模 62与定模 61之间形成第一空腔。
如图 3所示，动模 62固定在注射模具的基台 60上， 由基台 60带动动模 62向右移动， 使动模 62与定模 61下方的凹槽合模， 形成第一空腔。
S2: 利用第一注射器 631在第一空腔中形成第一层。
形成第一空腔之后， 就可以利用第一注射器 631向第一空腔中注射液态 材料， 在第一空腔中形成第一层。 在复合导光板的制造过程中， 可以先形成 导光层， 也可以先形成扩散层， 本实施例以先形成导光层（即第一层为导光 层）为例进行说明。
进一步， 动模 62的表面具有凹凸结构，使形成导光层的同时， 在导光层 的下表面形成若干凸起或凹陷的反光结构。
S3: 移动动模 62, 在动模 62上的第一层与定模 61之间形成第二空腔。 导光层形成之后， 由基台 60带动动模 62向左移动（开模）， 导光层也和 动模 62—起移动。
然后动模 62旋转 180° , 根据注射模具的具体构造， 动模 62可以在基 台 60的带动下， 与基台 60—起旋转； 或者， 动模 62也可以独立旋转， 而基 台 60保持不动。
动模 62旋转 180° 之后，再由基台 60带动动模 62和导光层向右移动（即 合模）， 使导光层与定模 61上方的凹槽合模， 形成第二空腔。
S4: 利用第二注射器 632在第二空腔中形成第二层。
形成第二空腔之后， 利用第二注射器 632向第二空腔中注射具有光扩散 特性的树脂材料， 在第二空腔中形成第二层， 即扩散层。
经上述步骤 S1至 S4之后， 即可形成本发明实施例 1所提供的复合导光 板。
在其他实施方式中， 也可以现在第一空腔中形成扩散层， 再在第二空腔 中形成导光层， 那么定模上方的凹槽表面应当具有凹凸结构， 使在第二空腔 中导光层的同时， 在导光层的下表面形成若干凸起或凹陷的反光结构。 实施例 5:
本实施例提供复合导光板的另一种制造方法， 本实施例与实施例 4基本 相同， 其不同点在于： 如图 4所示， 本实施例中， 定模 610自身形成一个较 大的空腔， 动模 620为一个可滑动的推板。 动模 620移动至右端时， 可将定 模 610分隔成第一空腔和第二空腔。 利用第一注射器 631在第一空腔内形成 第一层之后， 动模 620移动至左端， 就可以利用第二注射器 632在第二空腔 中形成第二层， 即可形成本发明实施例 1所提供的复合导光板。
以上所述， 仅为本发明的具体实施方式， 但本发明的保护范围并不局限 于此， 任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保 护范围应以权利要求的保护范围为准。

Claims

权利要求书
1、 一种复合导光板， 包括导光层， 以及形成在所述导光层上的扩散层； 所述导光层的下表面为反光面。
2、根据权利要求 1所述的复合导光板， 其中： 所述反光面上具有若干凸 起或凹陷的反光结构。
3、根据权利要求 2所述的复合导光板， 其中： 所述反光结构的横截面为 半圓形、 半橢圓形或多边形。
4、 一种背光模组， 包括： 光源， 以及权利要求 1至 3任一项所述的复合 导光板， 所述光源设置在所述复合导光板的导光层的侧面。
5、根据权利要求 4所述的背光模组， 其中： 所述复合导光板的下方设置 有反射板， 所述复合导光板的上方设置有至少一层棱镜板。
6、 根据权利要求 4所述的背光模组， 其中： 所述光源为发光二极管。
7、 一种显示装置， 包括权利要求 4至 6任一项所述的背光模组。
8、一种复合导光板的制造方法， 利用注射模具制造所述复合导光板， 所 述注射模具包括定模、动模、 第一注射器和第二注射器， 所述制造方法包括： 移动所述动模， 在所述动模与所述定模之间形成第一空腔；
利用所述第一注射器在所述第一空腔中形成第一层；
移动所述动模， 在所述动模上的所述第一层与所述定模之间形成第二空 腔；
利用所述第二注射器在所述第二空腔中形成第二层；
其中， 所述第一层和所述第二层分别为导光层和扩散层， 或， 所述第一 层和所述第二层分别为扩散层和导光层。
9、根据权利要求 8所述的制造方法， 其中： 所述动模或所述定模的表面 具有凹凸结构， 使形成导光层的同时， 在所述导光层的下表面形成若干凸起 或凹陷的反光结构。
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