WO2015027623A1 - 导光板及其制造方法、背光模组、显示装置 - Google Patents

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
WO2015027623A1
WO2015027623A1 PCT/CN2013/089472 CN2013089472W WO2015027623A1 WO 2015027623 A1 WO2015027623 A1 WO 2015027623A1 CN 2013089472 W CN2013089472 W CN 2013089472W WO 2015027623 A1 WO2015027623 A1 WO 2015027623A1
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WO
WIPO (PCT)
Prior art keywords
layer
light
light guide
guide plate
cavity
Prior art date
Application number
PCT/CN2013/089472
Other languages
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
京东方科技集团股份有限公司
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
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Application filed by 北京京东方光电科技有限公司, 京东方科技集团股份有限公司 filed Critical 北京京东方光电科技有限公司
Priority to US14/361,181 priority Critical patent/US20150138835A1/en
Publication of WO2015027623A1 publication Critical patent/WO2015027623A1/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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0018—Redirecting means on the surface of the light guide
    • 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
    • B29C45/1635—Making multilayered or multicoloured articles using displaceable mould parts, e.g. retractable partition between adjacent mould cavities
    • 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0018—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular optical properties, e.g. fluorescent or phosphorescent
    • B29K2995/003—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0075—Light guides, optical cables
    • 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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0016—Grooves, prisms, gratings, scattering particles or rough surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • 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

  • Embodiments of the present invention relate to the field of display technologies, and in particular, to a light guide plate and a method of manufacturing the same, a backlight module provided with the 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 liquid crystal display and is used to provide a uniform surface light source for the liquid crystal display.
  • the backlight module mainly includes a light guide plate and a light source disposed on a side of the light guide plate, and most of them use a Light Emitting Diode (LED) as a light source. Because the size of the LED cannot be made very thin, the commonly used LEDs are 0.6T and 0.4T (ie 0.6mm or 0.4mm). Therefore, the current light guide plate is usually made into a wedge shape, that is, the upper surface of the light guide plate. The step surface is formed, and the portion outside the display area is thicker, and the portion is close to the LED, and the larger thickness is used to match the size of the LED; and the portion corresponding to the display area is thinner to reduce the thickness of the backlight module.
  • LED Light Emitting Diode
  • the upper surface of the light guide plate is a stepped surface, and the upper upper step surface and the lower lower step surface are usually connected by a slope.
  • the inventors have found that in this configuration, after the light is incident from the light source into the light guide plate, it is easily ejected from the slope of the light guide plate, causing light loss. Light loss not only reduces the brightness of the backlight module, but also causes light leakage in the liquid crystal display, which affects the display. Summary of the invention
  • the embodiment of the invention provides a light guide plate and a manufacturing method thereof, a backlight module provided with the light guide plate, and a display device provided with the backlight module, which solves the problem that the conventional wedge-shaped light guide plate is easy to cause light loss.
  • the brightness of the backlight module is lowered, and the liquid crystal display is caused to leak light, which affects the technical problem of the display effect.
  • an embodiment of the present invention provides a light guide plate including a light guiding layer and a reflective layer;
  • the lower surface of the light guiding layer is a reflective surface
  • the upper surface of the light guiding layer is a step surface, and includes an upper step surface, a lower step surface, and a slope connected between the upper step surface and the lower step surface, wherein the lower step surface is a light emitting surface ;
  • the reflective layer covers the slope.
  • the reflective layer covers the slope and the upper step.
  • the material of the reflective layer is a resin having a reflective property.
  • Both the light guiding layer and the reflective layer are formed by an injection molding process.
  • the reflective surface has a plurality of convex or concave reflective structures.
  • the present invention also provides a backlight module including a light source, and the light guide plate, wherein the light source is disposed on a side adjacent to an upper step surface of the light guiding layer.
  • the light source is a light emitting diode.
  • a reflector is further disposed under the light guide plate, and a diffuser plate and at least one prism plate are further disposed above the light guide plate.
  • the invention also provides a display device comprising the above backlight module.
  • the present invention also provides a method of manufacturing the above light guide plate, wherein the light guide plate is manufactured by using an injection molding die, the injection molding die comprising a fixed mold, a movable mold, a first syringe and a second syringe, the manufacturing method comprising:
  • the first layer and the second layer are respectively a light guiding layer and a reflective layer, or the first layer and the second layer are respectively a reflective layer and a light guiding layer.
  • the fixed mold is provided with a first groove and a second groove
  • the moving the movable mold forming a first cavity between the movable mold and the stationary mold, comprising: moving the movable mold, a first groove on the movable mold and the fixed mold Forming a first cavity therebetween; moving the movable mold to form a second cavity between the first layer and the stationary mold, comprising: moving the movable mold, in the first layer and Forming a second space between the second grooves on the fixed mold Cavity.
  • the movable mold is a slidable push plate
  • the moving the movable mold forming a first cavity between the movable mold and the stationary mold, comprising: sliding the movable mold, and the moving mold separating the fixed mold into a first cavity
  • moving the movable mold to form a second cavity between the first layer and the stationary mold comprising: sliding the movable mold, in the first layer and the A second cavity is formed between the stationary molds.
  • the upper surface of the light guiding layer in the light guiding plate provided by the present invention is a step surface, and is composed of an upper step surface, a slope surface, and a lower step surface, that is, a guide
  • the light layer is wedge-shaped and is covered with a reflective layer on the slope of the light guiding layer.
  • the reflective layer can prevent the light from exiting the light guiding layer, and reflect the light back into the light guiding layer, and finally exit from the light emitting surface (lower surface), thereby effectively reducing light loss and improving
  • the brightness of the backlight module is also avoided, and the problem that the liquid crystal display generates light leakage and affects the display effect is also avoided.
  • FIG. 1 is a schematic view of a light guide plate according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic view showing an optical path in a light guide plate according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic view of a light guide plate according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic diagram of a backlight module according to Embodiment 3 of the present invention.
  • Fig. 5 is a schematic view showing an injection molding die in a method of manufacturing a light guide plate according to Embodiment 5 of the present invention. and a schematic view. detailed description
  • a light guide plate includes a light guiding layer 1 and a reflective layer 2.
  • the lower surface 11 of the light guiding layer 1 is a reflecting surface, and the reflecting surface usually has a plurality of convex or concave reflecting structures (not shown).
  • the upper surface of the light guiding layer 1 is a stepped surface, and includes an upper step surface 12, a lower step surface 14, and a slope 13 connected between the upper step surface 12 and the lower step surface 14.
  • the lower step surface 14 is a light exit surface corresponding to the display area; the upper step surface 12 and the slope surface 13 are located outside the display area, that is, the portion of the light guide layer 1 outside the display area is wedge-shaped.
  • the reflective layer 2 is covered on the inclined surface 13, and the reflective layer 2 is made of a resin having a reflective property.
  • the reflective layer may also be made of a metal material or the like having a good reflective property.
  • the resin is less expensive than the metal and can be made by an injection molding process together with the light guiding layer, so that the manufacturing process is also more compact.
  • the light guiding layer 1 in the light guiding plate according to the embodiment of the present invention has a wedge shape, and the upper surface of the light guiding layer 1 is a stepped surface, and is composed of an upper step surface 12, a slope surface 13 and a lower step surface 14, and the slope surface 13 is covered with reflection.
  • Layer 2 As shown in FIG. 2, when the light emitted by the light source 3 is incident on the inclined surface 13, or is reflected toward the inclined surface 13, the reflective layer 2 can prevent the light from exiting the light guiding layer 1 and reflect the light back to the light guiding layer 1. Inside, the inside of the light guiding layer 1 is reflected one or more times, and finally emitted from the light emitting surface (lower surface 14). Thus, the loss of light is effectively reduced, the luminance of the backlight module is improved, and the problem that light leakage from the slope 13 located outside the display area of the liquid crystal display affects the display effect is also avoided.
  • the reflective layer 2 on the inclined surface 13 can prevent light leakage, the length and slope of the inclined surface 13 can be increased, thereby increasing the height difference between the upper step surface 12 and the lower step surface 14, so that the lower step surface 14 (light emitting surface) The portion where it is located is thinner, that is, the thickness of the portion of the light guiding layer 1 located in the display region is reduced, and the thickness of the backlight module is further reduced.
  • both the light guiding layer and the reflective layer are formed by an injection molding process.
  • the injection molding process is simple and reliable, and the yield of the light guide plate is high by the injection molding process, and the thickness of the reflective layer can be made very small by the injection molding process, so that the thickness of the light guide plate is not affected.
  • Embodiment 2 covers the inclined surface 13 and the upper step surface 12.
  • the reflective layer 2 not only covers the oblique
  • the surface 13 also covers the upper step surface 12, and also prevents light from exiting the light guiding layer 1 from the upper step surface 12, further reducing light loss and improving the brightness of the backlight module.
  • a backlight module comprising a light source 3, and the light guide plate 10 provided in Embodiment 1 or Embodiment 2 above.
  • the light source 3 is a light emitting diode (LED) which is disposed at a side adjacent to the upper step 12 of the light guiding layer 1.
  • a reflector 4 is disposed under the light guide plate 10, and a diffusion plate and at least one prism plate (a diffusion plate and a prism plate are not shown) may be disposed above the light guide plate 10.
  • the light guiding layer 1 in the light guide plate 10 has a wedge shape, and the upper surface of the light guiding layer 1 is a stepped surface, and the upper step surface 12, the lower step surface 14 and the upper step surface are connected. It is composed of a slope 13 of the lower step surface, and is covered with a reflective layer 2 on the slope 13 of the light guiding layer 1.
  • the reflective layer 2 can prevent the light from exiting the light guiding layer 1 and reflect the light back into the light guiding layer 1 after being reflected one or more times inside the light guiding layer 1, and finally
  • the light-emitting surface (the lower surface 14) is emitted, thereby effectively reducing the loss of light. Therefore, the backlight module provided by the embodiment of the invention has higher brightness, and also avoids light from being outside the display area of the liquid crystal display.
  • the light leakage emitted from the inclined surface 13 and the upper step surface 12 affects the display effect.
  • the reflective layer 2 on the inclined surface 13 can prevent light leakage, the length and slope of the inclined surface 13 can be increased, thereby increasing the height difference between the upper step surface 12 and the lower step surface 14, so that the lower step surface 14 (light emitting surface)
  • the portion where it is located is thinner, that is, the thickness of the portion of the light guiding layer 1 located in the display region is reduced to further reduce the thickness of the backlight module provided by the embodiment of the present invention.
  • a display device comprising the backlight module provided by the above embodiment.
  • the display device may be any product or component having a display function such as a liquid crystal panel, a liquid crystal television, a liquid crystal display, a digital photo frame, a mobile phone, a tablet, or the like.
  • the display device provided by the embodiment of the present invention has the same technical features as the backlight module and the light guide plate provided by the embodiment of the present invention, the same technical effect can be produced and the same technical problem can be solved.
  • a method of manufacturing a light guide plate according to the first embodiment and the second embodiment wherein the light guide plate is manufactured by using an injection molding die, as shown in FIG. 5, the injection molding die A fixed mold 51, a movable mold 52, a first syringe 531, and a second syringe 532 are included.
  • the manufacturing method of the light guide plate comprises the following steps:
  • Step S1 Moving the moving mold, forming a first cavity between the moving mold and the fixed mold.
  • the movable mold 52 is fixed on the base 50 of the injection molding die, and the movable mold 52 is moved to the right by the base 50, so that the movable mold 52 and the first recess under the fixed mold 51 are closed to form a mold.
  • the first cavity As shown in FIG. 5, the movable mold 52 is fixed on the base 50 of the injection molding die, and the movable mold 52 is moved to the right by the base 50, so that the movable mold 52 and the first recess under the fixed mold 51 are closed to form a mold.
  • the first cavity is shown in FIG. 5, the movable mold 52 is fixed on the base 50 of the injection molding die, and the movable mold 52 is moved to the right by the base 50, so that the movable mold 52 and the first recess under the fixed mold 51 are closed to form a mold.
  • the first cavity As shown in FIG. 5, the movable mold 52 is fixed on the base 50 of the injection molding die, and the movable mold 52 is moved to the right by the base 50,
  • Step S2 forming a first layer in the first cavity using the first syringe.
  • the first syringe 531 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 reflective layer may be formed first.
  • the light guide layer is formed first (ie, the first layer is the light guide layer) as an example.
  • the surface of the movable mold 52 has a concavo-convex structure such that a light-reflecting layer is formed, and a plurality of convex or concave reflecting structures are formed on the lower surface of the light guiding layer.
  • Step S3 Moving the movable mold 52, forming a second cavity between the first layer and the fixed mold.
  • the movable mold 52 is moved to the left by the base 50, and the light guiding layer is also moved together with the movable mold 52.
  • the movable mold 52 is rotated by 180°.
  • the movable mold 52 can be rotated together with the base 50 by the base 50; alternatively, the movable mold 52 can also be rotated independently, and the base 50 can be rotated independently. stand still.
  • the movable mold 52 After the movable mold 52 is rotated by 180°, the movable mold 52 and the light guiding layer are moved to the right by the base 50, and the light guiding layer is clamped with the second recess above the fixed mold 51 to form a second cavity.
  • Step S4 A second layer is formed in the second cavity by the second syringe 532.
  • a resin material having a retroreflective property is injected into the second cavity by the second syringe 532, and a second layer, i.e., a reflective layer, is formed in the second cavity.
  • the light guide plate provided in Embodiment 1 or Embodiment 2 of the present invention can be formed.
  • the reflective layer may be formed in the first cavity and the light guiding layer may be formed in the second cavity.
  • the groove surface above the fixed mold should have a concave-convex structure, so that in the second cavity.
  • a plurality of convex or concave reflective structures are formed on the lower surface of the light guiding layer.
  • This embodiment provides another manufacturing method of the light guide plate in Embodiment 1 and Embodiment 2,
  • the embodiment is basically the same as the embodiment 5, and the difference is that, as shown in FIG. 6, in the embodiment, the fixed mold 510 itself forms a large cavity, and the movable mold 520 is a slidable push plate.
  • the fixed mold 510 can be divided into a first cavity and a second cavity.
  • the first syringe 531 is used to form the first layer in the first cavity
  • the movable mold 520 is slid to the left end, so that a second cavity can be formed between the first layer and the stationary mold 510, and then the second syringe 532 is used.
  • a second layer is formed in the two cavities to form the light guide plate provided in Embodiment 1 or Embodiment 2 of the present invention.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

一种导光板、用于制造该导光板的方法、设有该导光板的背光模组、以及设有该背光模组的显示装置。导光板包括导光层（1）和反射层（2）。导光层（1）的下表面（11）为反光面。导光层（1）的上表面为阶梯面，包括上阶面（12）、下阶面（14）、以及连接于上阶面（12）与下阶面（14）之间的斜面（13）。下阶面（14）为出光面。反射层（2）覆盖在斜面（13）上。

Description

导光板及其制造方法、 背光模组、 显示装置 技术领域
本发明的实施例涉及显示技术领域，特别涉及一种导光板及其制造方法、 设有该导光板的背光模组， 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。 背光模组是液晶显示器中的重要部件， 用 于为液晶显示器提供均匀的面光源。
目前， 手机、 平板电脑等设备上的液晶显示器已经越做越薄， 所以液晶 显示器中背光模组的厚度也在不断减小。 背光模组主要包括导光板， 以及设 置在导光板侧面的光源， 并且大多以发光二极管 （Light Emitting Diode, 筒 称 LED )作为光源。 因为 LED的尺寸不可能做得很薄， 常用的 LED为 0.6T 和 0.4T (即 0.6mm或 0.4mm ) 两种规格， 所以现在的导光板通常制成楔形， 也就是将导光板的上表面制成阶梯面， 位于显示区域之外的部分较厚， 这一 部分靠近 LED, 较大的厚度用以匹配 LED的尺寸； 而对应于显示区域的部 分较薄， 以减小背光模组的厚度。
在惯常技术中， 导光板的上表面为阶梯面， 较高的上阶面与较低的下阶 面之间通常以斜面连接。 发明人发现， 在这种构造中， 光从光源射入导光板 之后， 易于从导光板的斜面处射出， 造成光损失。 光损失不但会降低背光模 组的辉度， 而且还会使液晶显示器产生漏光， 影响显示效果。 发明内容
本发明的实施例提供了一种导光板及其制造方法， 设有该导光板的背光 模组， 以及设有该背光模组的显示装置， 解决了惯常的楔形导光板易于造成 光的损失， 使背光模组的辉度降低， 而且还会使液晶显示器产生漏光， 影响 显示效果的技术问题。 为达到上述目的， 本发明的实施例提供一种导光板， 包括导光层和反射 层；
所述导光层的下表面为反光面；
所述导光层的上表面为阶梯面， 包括上阶面、 下阶面， 以及连接于所述 上阶面与所述下阶面之间的斜面， 其中， 所述下阶面为出光面；
所述反射层覆盖在所述斜面上。
进一步， 所述反射层覆盖在所述斜面和所述上阶面上。
反射层的材料为具有反光特性的树脂。
所述导光层和所述反射层均通过注射成型工艺制成。
进一步， 所述反光面上具有若干凸起或凹陷的反光结构。
本发明还提供一种背光模组， 包括光源， 以及上述的导光板， 所述光源 设置在与所述导光层的上阶面相邻的侧面。
所述光源为发光二极管。
进一步， 所述导光板的下方还设置有反射板， 所述导光板的上方还设置 有扩散板和至少一层棱镜板。
本发明还提供一种显示装置， 包括上述的背光模组。
本发明还提供一种上述导光板的制造方法， 利用注射成型模具制造所述 导光板， 所述注射成型模具包括定模、 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反射层， 或， 所述第一 层和所述第二层分别为反射层和导光层。
在一种实施方式中， 所述定模上设置有第一凹槽和第二凹槽；
所述移动所述动模， 在所述动模与所述定模之间形成第一空腔， 包括： 移动所述动模,在所述动模与所述定模上的第一凹槽之间形成第一空腔； 所述移动所述动模，在所述第一层与所述定模之间形成第二空腔， 包括: 移动所述动模， 在所述第一层与所述定模上的第二凹槽之间形成第二空 腔。
在另一种实施方式中， 所述动模为可滑动的推板；
所述移动所述动模， 在所述动模与所述定模之间形成第一空腔， 包括： 滑动所述动模， 使所述动模将所述定模分隔成第一空腔和第二空腔； 所述移动所述动模，在所述第一层与所述定模之间形成第二空腔， 包括: 滑动所述动模， 在所述第一层与所述定模之间形成第二空腔。
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： 本发明 提供的导光板中导光层的上表面为台阶面， 由上阶面、 斜面、 下阶面组成， 即导光层呈楔形，并且在导光层的斜面上覆盖有反射层。 当有光射向斜面时， 反射层能够阻止这些光射出导光层， 并且将这些光反射回导光层内部， 最终 从出光面 （下阶面）射出， 从而有效减少了光的损失， 提高了背光模组的辉 度， 而且还避免了液晶显示器产生漏光而影响显示效果的问题。 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所提供的导光板的示意图；
图 2为本发明的实施例 1所提供的导光板中的光路示意图；
图 3为本发明的实施例 2所提供的导光板的示意图；
图 4为本发明的实施例 3所提供的背光模组的示意图；
图 5为本发明的实施例 5所提供的导光板的制造方法中注射成型模具的 示意图； 以及 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， 根据本发明的实施例的导光板包括导光层 1和反射层 2。 导光层 1的下表面 11为反光面，反光面上通常具有若干凸起或凹陷的反光结 构（图中未示出）。导光层 1的上表面为阶梯面， 包括上阶面 12、下阶面 14, 以及连接于上阶面 12与下阶面 14之间的斜面 13。 其中， 下阶面 14为出光 面， 对应于显示区域； 上阶面 12和斜面 13位于显示区域之外， 即导光层 1 位于显示区域之外的部分呈楔形。反射层 2覆盖在斜面 13上，反射层 2由具 有反光特性的树脂制成。 在其他实施方式中， 反射层也可以由反光特性较好 的金属材料等制成。 相对于金属， 树脂的成本更低， 并且可以与导光层一起 通过注射成型工艺制成， 因此制造过程也更为筒单。
根据本发明实施例的导光板中的导光层 1呈楔形， 导光层 1的上表面为 台阶面， 由上阶面 12、 斜面 13以及下阶面 14组成， 并且斜面 13上覆盖有 反射层 2。 如图 2所示， 当光源 3发出的光射向斜面 13, 或经反射之后射向 斜面 13时， 反射层 2能够阻止这些光射出导光层 1 , 并且将这些光反射回导 光层 1内部，在导光层 1内部经一次或多次反射，最终从出光面（下阶面 14 ) 射出。 这样， 有效减少了光的损失， 提高了背光模组的辉度， 同时还避免了 光从位于液晶显示器的显示区域之外的斜面 13射出的漏光影响显示效果的 问题。
此外， 由于斜面 13上的反射层 2能够防止漏光， 可以增大斜面 13的长 度和坡度， 从而增大上阶面 12与下阶面 14之间的高度差， 使下阶面 14 (出 光面）所在的部分更薄， 即减小了导光层 1位于显示区域的部分的厚度， 进 一步减小了背光模组的厚度。
在本实施例中， 导光层和反射层均通过注射成型工艺制成。 注射成型工 艺筒单、 可靠， 通过注射成型工艺制造导光板良品率高， 而且通过注射成型 工艺可以将反射层的厚度做得非常小， 所以不会影响导光板的厚度。
实施例 2:
如图 3所示， 实施例 2与实施例 1的差异在于： 如图 3所示， 本实施例 中， 反射层 2覆盖在斜面 13和上阶面 12上。 这样， 反射层 2不仅覆盖了斜 面 13, 还覆盖了上阶面 12, 还可以防止光从上阶面 12射出导光层 1 , 进一 步减少光的损失， 提高背光模组的辉度。
实施例 3:
根据本发明的另一个方面， 提供了一种背光模组， 包括光源 3, 以及上 述实施例 1 或实施例 2所提供的导光板 10。 光源 3 为发光二极管 （Light Emitting Diode, 筒称 LED ) , 设置在与导光层 1的上阶面 12相邻的侧面处。
进一步， 导光板 10的下方还设置有反射板 4, 导光板 10的上方还可设 置有扩散板和至少一层棱镜板（图中未示出扩散板和棱镜板） 。
在根据本发明实施例的背光模组中，导光板 10中的导光层 1呈楔形，导 光层 1的上表面为台阶面， 由上阶面 12、 下阶面 14以及连接上阶面和下阶 面的斜面 13组成， 并且在导光层 1的斜面 13上覆盖有反射层 2。 当有光射 向斜面 13时， 反射层 2能够阻止这些光射出导光层 1 , 并且将这些光反射回 导光层 1内部， 在导光层 1内部经一次或多次反射之后， 最终从出光面 （下 阶面 14 )射出， 从而有效减少了光的损失， 因此本发明实施例提供的背光模 组具有更高的辉度， 同时还避免了光从位于液晶显示器的显示区域之外的斜 面 13和上阶面 12射出的漏光影响显示效果的问题。
此外， 由于斜面 13上的反射层 2能够防止漏光， 可以增大斜面 13的长 度和坡度， 从而增大上阶面 12与下阶面 14之间的高度差， 使下阶面 14 (出 光面）所在的部分更薄， 即减小了导光层 1位于显示区域的部分的厚度， 以 进一步减小本发明实施例提供的背光模组的厚度。
实施例 4:
根据本发明的再一个方面， 提供了一种显示装置， 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面板、 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。
实施例 5:
根据本发明的又一方面， 提供一种上述实施例 1及实施例 2中的导光板 的制造方法， 利用注射成型模具制造导光板， 如图 5所示， 该注射成型模具 包括定模 51、 动模 52、 第一注射器 531和第二注射器 532。
该导光板的制造方法包括以下步骤：
步骤 S1: 移动动模， 在动模与定模之间形成第一空腔。
如图 5所示，动模 52固定在注射成型模具的基台 50上， 由基台 50带动 动模 52向右移动,使动模 52与定模 51下方的第一凹槽合模，形成第一空腔。
步骤 S2: 利用第一注射器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 531向第一空腔中注射液态 材料， 在第一空腔中形成第一层。 在导光板的制造过程中， 可以先形成导光 层， 也可以先形成反射层， 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 52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。
步骤 S3: 移动动模 52, 在第一层与定模之间形成第二空腔。
导光层形成之后， 由基台 50带动动模 52向左移动， 导光层也和动模 52 一起移动。
然后动模 52旋转 180° , 根据注射成型模具的实际构造， 动模 52可以 在基台 50的带动下， 与基台 50—起旋转； 或者， 动模 52也可以独立旋转， 而基台 50保持不动。
动模 52旋转 180° 之后， 再由基台 50带动动模 52和导光层向右移动， 使导光层与定模 51上方的第二凹槽合模， 形成第二空腔。
步骤 S4: 利用第二注射器 532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 532向第二空腔中注射具有反光特 性的树脂材料， 在第二空腔中形成第二层， 即反射层。
经上述步骤 S1至 S4之后， 即可形成本发明实施例 1或实施例 2所提供 的导光板。
在其他实施方式中， 也可以现在第一空腔中形成反射层， 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 中形成导光层的同时， 在导光层的下表面形成若干凸起或 陷的反光结构。
实施例 6:
本实施例提供了实施例 1及实施例 2中的导光板的另一种制造方法， 本 实施例与实施例 5基本相同， 其不同点在于： 如图 6所示， 本实施例中， 定 模 510 自身形成一个较大的空腔， 动模 520为一个可滑动的推板。 动模 520 滑动至右端时， 可将定模 510分隔成第一空腔和第二空腔。 利用第一注射器 531在第一空腔内形成第一层之后， 动模 520滑动至左端， 就可以在第一层 与定模 510之间形成第二空腔， 然后利用第二注射器 532在第二空腔中形成 第二层， 即可形成本发明实施例 1或实施例 2所提供的导光板。
以上所述仅是本发明的示范性实施方式， 而非用于限制本发明的保护范 围， 本发明的保护范围由所附的权利要求确定。

Claims

权利要求书
1. 一种导光板， 其包括导光层和反射层；
所述导光层的下表面为反光面；
所述导光层的上表面为阶梯面， 包括上阶面、 下阶面以及连接于所述上 阶面与所述下阶面之间的斜面；
其中， 所述下阶面为出光面； 所述反射层覆盖在所述斜面上。
2. 根据权利要求 1所述的导光板， 其中： 所述反射层覆盖在所述斜面和 所述上阶面上。
3. 根据权利要求 1或 2所述的导光板， 其中： 反射层的材料为具有反光 特性的树脂。
4. 根据权利要求 1至 3中任何一项所述的导光板， 其中： 所述导光层和 所述反射层均通过注射成型工艺制成。
5. 根据权利要求 1至 4中任何一项所述的导光板， 其中： 所述反光面上 具有若干凸起或凹陷的反光结构。
6.一种背光模组，其包括光源以及权利要求 1至 5任一项所述的导光板， 所述光源设置在与所述导光层的上阶面相邻的侧面。
7. 根据权利要求 6所述的背光模组， 其中， 所述光源为发光二极管。
8. 根据权利要求 6所述的背光模组， 其中： 所述导光板的下方还设置有 反射板， 所述导光板的上方还设置有扩散板和至少一层棱镜板。
9. 一种显示装置， 其中： 包括权利要求 6至 8任一项所述的背光模组。
10. 一种用于制造权利要求 1至 5中任何一项所述的导光板的方法， 其 中， 利用注射成型模具制造所述导光板， 所述注射成型模具包括定模、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反射层， 或， 所述第一 层和所述第二层分别为反射层和导光层。
11. 根据权利要求 10所述的制造方法， 其中： 所述定模上设置有第一凹 槽和第二 槽；
移动所述动模,在所述动模与所述定模上的第一凹槽之间形成第一空腔; 移动所述动模， 在所述第一层与所述定模上的第二凹槽之间形成第二空 腔。
12.根据权利要求 10所述的制造方法，其中：所述动模为可滑动的推板; 滑动所述动模， 使所述动模将所述定模分隔成第一空腔和第二空腔； 以 及
滑动所述动模， 在所述第一层与所述定模之间形成第二空腔。
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