WO2016058332A1 - 背光模组及显示装置 - Google Patents

背光模组及显示装置 Download PDF

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Publication number
WO2016058332A1
WO2016058332A1 PCT/CN2015/074667 CN2015074667W WO2016058332A1 WO 2016058332 A1 WO2016058332 A1 WO 2016058332A1 CN 2015074667 W CN2015074667 W CN 2015074667W WO 2016058332 A1 WO2016058332 A1 WO 2016058332A1
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WIPO (PCT)
Prior art keywords
light
backlight module
guide plate
optical lens
emitting diode
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PCT/CN2015/074667
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English (en)
French (fr)
Inventor
朱琳
李文波
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京东方科技集团股份有限公司
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Priority to US14/768,584 priority Critical patent/US20160252667A1/en
Publication of WO2016058332A1 publication Critical patent/WO2016058332A1/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
    • G02B6/003—Lens or lenticular 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

Definitions

  • Embodiments of the present invention relate to a backlight module and a display device.
  • a liquid crystal display is a passive light emitting device that requires a backlight unit (BLU) to provide a light source to the liquid crystal display to display an image.
  • BLU backlight unit
  • the backlight technologies mainly used in liquid crystal displays include: Cold Cathode Fluorescent Lamps (CCFLs) and Light Emitting Diodes (LEDs). Since the LED backlight has many advantages such as high brightness, high color purity, long life, good reliability, and no mercury pollution, the proportion of the backlight source is gradually increased.
  • the embodiment of the invention provides a backlight module and a display device, which can solve the problem that the backlight module has high heat energy due to low light extraction efficiency of the backlight module.
  • At least one embodiment of the present invention provides a backlight module including a light guide plate, a light emitting diode located on a light incident side of the light guide plate, and an optical lens disposed between the light emitting side of the light emitting diode and the light incident side of the light guide plate; The optical lens is serrated near the first surface of the light emitting diode.
  • the optical lens and the light guide plate are of a unitary structure.
  • the optical lens is attached to the light incident side surface of the light guide plate away from the second surface of the light emitting diode.
  • the second surface is in the form of a flat plate.
  • the optical lens is disposed on a surface of the light emitting diode and encapsulates the light emitting diode.
  • the sawtooth cross-sectional shape of the first surface includes at least one of a triangle, a rectangle, and a trapezoid.
  • the sawtooth cross-sectional shape of the first surface is an isosceles triangle; for example, the apex angle range of the isosceles triangle includes Includes 70° to 100°.
  • the material constituting the optical lens includes at least one of polymethyl methacrylate, polyvinyl chloride, polyethylene, polycarbonate, and polypropylene.
  • At least one embodiment of the present invention provides a display device including any of the backlight modules described above.
  • 1a is a schematic structural view of a display device
  • FIG. 1b is a partial schematic structural view of a backlight module
  • FIG. 2a is a schematic partial structural diagram of a backlight module according to an embodiment of the present invention.
  • 2b is a schematic diagram of light path propagation of a backlight module according to an embodiment of the present invention.
  • 3a-3c are schematic diagrams showing the arrangement of various optical lenses according to an embodiment of the present invention.
  • FIGS. 4a-4c are schematic structural views of various optical lenses according to an embodiment of the present invention.
  • FIG. 5 is a schematic diagram of light path propagation of another backlight module according to an embodiment of the present invention.
  • 10-color film substrate 11-array substrate; 12-liquid crystal layer; 13-light guide plate; 131-mesh; 14-light source; 141-light-emitting diode; 15-reflector; 20-optical lens; a surface; a second surface of the B-optical lens; C-one side of a sawtooth on the first surface; D-the other surface of the sawtooth adjacent to the sawtooth on the first surface; e-luminous a beam of light emitted by the diode; the angle of illumination of the alpha-light emitting diode; the apex angle of the sawtooth section of the ⁇ -isometric triangle.
  • LED backlights can be classified into direct type and side entry type.
  • a side-entry structure is shown in FIG. 1a.
  • the display panel includes a color filter substrate 10 and an array substrate 11 disposed opposite each other, and a liquid crystal layer 12 is disposed between the color filter substrate 10 and the array substrate 11.
  • the backlight module of the display panel includes a light guide plate 13 provided with a mesh point 131, a light source 14 on the side of the light guide plate 13, and a reflection plate 15 on the back surface of the light guide plate 13.
  • the light guide plate 13 After the light emitted from the light source 14 is incident on the light guide plate 13, the light is reflected by the reflection plate 15 and scattered by the dot 131, and then the light is transmitted to the light-emitting side of the display panel to realize the purpose of providing a light source to the liquid crystal display to display an image.
  • the number of the light emitting diodes 141 is generally increased. However, this will cause the backlight module to generate excessive thermal energy. When the above thermal energy cannot be effectively released, it will adversely affect the internal structure of the display, such as a liquid crystal layer, a resin material or a metal material. Thereby reducing the quality of the product.
  • At least one embodiment of the present invention provides a backlight module, as shown in FIG. 2a, which may include a light guide plate 13 and a light emitting diode 141 located on the light incident side of the light guide plate 13. As shown in FIG. 2a, the backlight module may further include an optical lens 20 disposed between the light emitting side of the light emitting diode 141 and the light incident side of the light guide plate 13.
  • the optical lens 20 is in a zigzag shape near the first surface A of the light emitting diode 141.
  • the light propagation process of the optical lens 20 is as shown in the enlarged view of FIG. 2 ( FIG. 2 b ). It can be seen that a light beam e emitted from the light emitting diode 141 is irradiated to one side of a sawtooth of the first surface A of the optical lens 20 . After C, reflection occurs at the surface C, and the reflected light is irradiated onto the adjacent serrations of the serrations, and after being refracted, is reflected at the other side D of the adjacent serrations, and the reflected light is incident on the light guide plate.
  • the serrated first surface can increase the contact surface with the light emitted from the LED. The contact surface can change the propagation path of the light, so that the light that cannot be incident into the light guide plate is finally incident into the light guide plate after being reflected and refracted multiple times. Thereby increasing the utilization of light emitted by the LED.
  • At least one embodiment of the present invention provides a backlight module including a light guide plate, and A light emitting diode located on the light incident side of the light guide plate.
  • the light emitted by the light-emitting diode is transmitted and scattered by the light guide plate, enters the display panel, and is emitted from the light-emitting side of the display panel.
  • the backlight module further includes: an optical lens disposed between the light emitting side of the light emitting diode and the light incident side of the light guide plate; and the first surface of the optical lens adjacent to the light emitting diode is in a zigzag shape.
  • the serrated first surface is capable of increasing its contact area with the light emitted by the LED such that light incident on and reflected from one side of the sawtooth can enter the adjacent serration and is refracted by another of the adjacent serrations The side is reflected into the light guide plate. Therefore, the embodiment of the present invention can reduce the loss of the reflected light, and can cause more light to enter the light guide plate, thereby improving the light extraction rate of the backlight module.
  • the utilization ratio of each of the light-emitting diodes is improved, the number of light-emitting diodes required for the backlight module can be reduced without affecting the display effect, thereby reducing power consumption. This also avoids the adverse effects of excessive thermal energy generated by the backlight module on the display panel. In turn, the quality of the product can be improved.
  • optical lens 20 The manner in which the above-described optical lens 20 is disposed will be exemplified below.
  • the optical lens 20 and the above-described light guide plate 13 may be provided in a unitary structure. In this way, in the process of fabricating the light guide plate 13, the fabrication of the optical lens 20 can be completed, thereby improving production efficiency.
  • the light guide plate 13 may be made of glass or a transparent resin material.
  • the optical lens 20 prepared by a separate manufacturing process may be attached to the light incident side surface of the light guide plate 13 away from the second surface B of the light emitting diode 141.
  • the second surface B of the optical lens 20 described above is provided in a flat shape.
  • the optical lens 20 and the light guide plate 13 can be fabricated by a separate preparation process. In this way, the optical lens 20 can be integrated on the light guide plate 13. Therefore, the difficulty in fabricating the light guide plate 13 is not increased. And because a separate manufacturing process is adopted for the optical lens 20, it is advantageous to improve the precision of the product.
  • the optical lens 20 can also be disposed on the surface of the LED 141, and the LED 141 is packaged.
  • the LED 141 is disposed in the optical lens.
  • the light emitted by the light emitting diode 141 can be completely irradiated onto the first surface A of the optical lens 20.
  • the propagation path of the light emitted by the light-emitting diode 141 can be changed to produce the effect of collecting light. More light can be incident into the light guide plate 13. Thereby improving the utilization of light.
  • the zigzag cross-sectional shape of the first surface A is not limited.
  • the zigzag cross-sectional shape may be a regular figure or an irregular figure. In order to simplify the manufacturing process, it is designed as a regular pattern, which may be, for example, a triangle as shown in FIG. 4a, or a rectangle as shown in FIG. 4b, or may also be at least one of trapezoids as shown in FIG. 4c.
  • the present invention does not limit the distance between the crest and the tooth bottom of the serration in the above-mentioned sawtooth first surface A.
  • the distance between the above-mentioned tooth tip and the tooth bottom can be increased, so that the area of the sawtooth inclined surface can be increased to receive more light and the propagation path thereof can be performed. change.
  • the shape of the serrations in the serrated first surface A may be unified into one shape or different shapes.
  • the present invention does not limit the size of each serration. That is, the size of each saw tooth may be equal or unequal.
  • the sawtooth cross-sectional shape of the first surface A may be an isosceles triangle; and the apex angle ⁇ of the isosceles triangle
  • the angular range may include 70° to 100°.
  • each of the serrations of the optical lens 20 can be an isosceles triangular prism.
  • Such an optical lens 20 facilitates processing and precision control due to the uniform sawtooth structure.
  • the first surface A having the above-described sawtooth structure can gather all the light rays within the light-emitting angle ⁇ to the maximum extent, and finally illuminate the light guide plate. Thereby, the light extraction rate of the backlight module is greatly improved, and the power consumption is reduced.
  • the material constituting the optical lens 20 may include some materials having high light transmittance, such as polymethyl methacrylate PMMA, polyvinyl chloride PVC, polyethylene PE. At least one of polycarbonate PC and polypropylene PP.
  • At least one embodiment of the present invention provides a display device including any of the backlight modules described above, which has the same structure and advantageous effects as the backlight module of the foregoing embodiment.
  • the structure and beneficial effects of the backlight module have been described in the foregoing embodiments, and are not described herein again.
  • the display device may specifically include liquid crystal
  • the display device may be any product or component having a display function such as a liquid crystal display, a liquid crystal television, a digital photo frame, a mobile phone or a tablet computer.

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  • 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

背光模组及显示装置，该背光模组包括导光板（13）、位于导光板（13）入光侧的发光二极管（141）、以及设置于上述发光二极管（141）出光侧与导光板（13）入光侧之间的光学透镜（20）；所述光学透镜（20）靠近发光二极管（141）的第一表面为锯齿状。该背光模组能够增加出光效率而降低发热。

Description

背光模组及显示装置 技术领域
本发明的实施例涉及一种背光模组及显示装置。
背景技术
液晶显示器(Liquid Crystal Display，LCD)是一种被动发光器件，需要背光模组(Backlight Unite，BLU)给液晶显示器提供光源以使其显示图像。目前，液晶显示器主要采用的背光源技术包括：冷阴极管(Cold Cathode Fluorescent Lamp，CCFL)和发光二极管(Light Emitting Diodes，LED)。由于LED背光源具有亮度高、色纯度高、寿命长、可靠性好、无汞污染等多种优点，在背光源的使用中占有的比重逐渐增大。
发明内容
本发明的实施例提供一种背光模组及显示装置，能够解决由于背光模组出光效率低，而导致背光模组热能较高的问题。
本发明至少一实施例提供一种背光模组，包括导光板、位于导光板入光侧的发光二极管、以及设置于所述发光二极管出光侧与所述导光板入光侧之间的光学透镜；所述光学透镜靠近所述发光二极管的第一表面为锯齿状。
例如，所述光学透镜与所述导光板为一体结构。
例如，将所述光学透镜远离所述发光二极管的第二表面贴附于所述导光板的入光侧表面。
例如，所述第二表面为平板状。
例如，所述光学透镜设置于所述发光二极管的表面，并将所述发光二极管进行封装。
例如，所述第一表面的锯齿截面形状包括三角形、矩形、梯形中的至少一种。
例如，在所述发光二极管的发光角度为120°的情况下，所述第一表面的锯齿截面形状均为等腰三角形；例如，所述等腰三角形的顶角角度范围包 括70°～100°。
例如，构成所述光学透镜的材料包括聚甲基丙烯酸甲酯、聚氯乙烯、聚乙烯、聚碳酸酯以及聚丙烯中至少一种。
本发明至少一实施例提供一种显示装置，包括如上所述的任意一种背光模组。
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简单地介绍，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1a为一种显示装置的结构示意图；
图1b为一种背光模组的局部结构示意图；
图2a为本发明实施例提供的一种背光模组的局部结构示意图；
图2b为本发明实施例提供的一种背光模组的光线路径传播示意图；
图3a-图3c为本发明实施例提供的多种光学透镜的设置方式示意图；
图4a-图4c为本发明实施例提供的多种光学透镜的结构示意图；
图5为本发明实施例提供的另一种背光模组的光线路径传播示意图。
附图说明：
10-彩膜基板；11-阵列基板；12-液晶层；13-导光板；131-网点；14-光源；141-发光二极管；15-反射板；20-光学透镜；A-光学透镜的第一表面；B-光学透镜的第二表面；C-所述第一表面上一锯齿的一侧面；D-所述第一表面上与所述锯齿相邻的锯齿的另一表面；e-发光二极管发出的一束光线；α-发光二极管的发光角度；β-等腰三角形锯齿截面的顶角。
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。
在液晶显示器中，LED背光源可以分为直下式和侧入式。一种侧入式的结构如图1a所示，显示面板包括相互对盒设置的彩膜基板10和阵列基板11，在彩膜基板10和阵列基板11之间设置有液晶层12。在显示面板的背光模组包括设置有网点131的导光板13，位于导光板13侧面的光源14，以及位于导光板13背面的反射板15。光源14发出的光线入射至导光板13后，经过反射板15的反射以及网点131的散射后，向显示面板的出光侧传播光线，以实现向液晶显示器提供光源使其显示图像的目的。
然而上述背光模组结构中，在光源14上的单颗发光二极管141的出射光照射至导光板13的过程中，会出现光线的损耗。例如，如图1b所示，当光线照射至导光板13的入光侧表面时，该表面会将一部分入射光线(图中虚线所示光线)进行反射，使得该部分光线无法入射至导光板内部，导致光线损耗，降低了背光模组的出光效率，从而影响了显示器的显示效果。
为了解决上述问题，一般会增加发光二极管141的个数。然而这样一来，将导致背光模组产生过多的热能。当上述热能无法得到有效的释放时，将对显示器的内部结构，例如液晶层、树脂材料或金属材料构成的薄膜层产生不利的影响。从而降低了产品质量。
本发明至少一实施例提供一种背光模组，如图2a所示，可以包括导光板13，以及位于导光板13入光侧的发光二极管141。如图2a所示，该背光模组还可以包括：设置于发光二极管141出光侧与导光板13入光侧之间的光学透镜20。
例如，光学透镜20靠近发光二极管141的第一表面A为锯齿状。
具体的，光学透镜20的光线传播过程如O处放大图(图2b)所示，可以看出，发光二极管141发出的一束光线e照射至光学透镜20第一表面A的一锯齿的一侧面C后，在表面C处发生反射，反射光线会照射至于上述锯齿相邻的锯齿上，并经过折射后在与该相邻锯齿的另一侧面D处发生反射，反射后的光线入射至导光板内。因此，锯齿状的第一表面能够增大与发光二极管出射光线的接触面。上述接触面能够改变光线的传播路径，使得原本不能够入射至导光板中的光线在经过多次反射、折射后最终入射至导光板内。从而提高了发光二极管发出光线的利用率。
本发明至少一实施例提供一种背光模组，该背光模组包括导光板，以及 位于导光板入光侧的发光二极管。发光二极管发出的光线经导光板的传导、散射后，进入显示面板，并从显示面板的出光侧发出。该背光模组还包括：设置于上述发光二极管出光侧与导光板入光侧之间的光学透镜；所述光学透镜靠近发光二极管的第一表面为锯齿状。锯齿状的第一表面能够增加其与发光二极管发出光线的接触面积，使得在锯齿的一侧面入射并反射的光线能够进入与其相邻的锯齿中，并经过折射后被该相邻锯齿的另一侧面反射至导光板中。因而，本发明的实施例可以降低上述反射光线的损耗，能够使得更多的光线入射至导光板，从而提高了背光模组的出光率。
并且，由于每一颗发光二极管光线的利用率得到了提升，因此可以在不影响显示效果的前提下，可减小背光模组所需要的发光二极管的数量，从而能够降低功耗。这也避免了背光模组产生的过多热能对显示面板造成的不利影响。进而可以提高产品质量。
以下对上述光学透镜20的设置方式进行举例说明。
如图3a所示，可以将光学透镜20与上述导光板13设置为一体结构。这样一来，在制作导光板13的过程中，就可以完成光学透镜20的制作，从而提高了生产效率。导光板13可以采用玻璃或者透明树脂材料制成。
如图3b所示，可以将通过单独的制作工艺制备而成的光学透镜20，其远离发光二极管141的第二表面B贴附于导光板13的入光侧表面。
在此基础上，为了提高光学透镜20与导光板13的贴合度。例如将上述光学透镜20的第二表面B设置为平板状。
上述方案中，光学透镜20与导光板13可以通过单独的制备工艺制作而成。这样一来，能够在导光板13上对光学透镜20进行整合。因此不会增加导光板13的制作难度。并且由于对光学透镜20采用单独的制作工艺，有利于提高产品的精度。
如图3c所示，还可以将光学透镜20设置于发光二极管141的表面，并将该发光二极管141进行封装，该发光二极管141设置于光学透镜之中。这样一来，可以使得发光二极管141发出的光线完全照射至光学透镜20的第一表面A上。在锯齿状的第一表面A的作用下，可以改变发光二极管141发出光线的传播路径，产生聚光的效果。使得更多的光线能够入射至导光板13中。从而提高了光线的利用率。
当然，上述仅仅是对光学透镜20设置方式的举例说明，其它方式在此不再一一举例，但都因当属于本发明的保护范围。
需要说明的是，第一、本发明对上述第一表面A的锯齿截面形状不做限定。该锯齿截面形状可以是规则的图形，也可以是不规则图形。为了简化制作工艺，设计为规则图形，例如可以为如图4a所示的三角形，或如图4b所示的矩形，又或者还可以为如图4c所示的梯形中的至少一种。
第二、本发明对上述锯齿状第一表面A中的锯齿的齿顶和齿底之间的距离不做限定。例如，为了对更多的光线的传播路径进行改变，可以将增加上述齿顶与齿底之间的距离，从而能够增加锯齿倾斜面的面积，以接受更多的光线，并对其传播路径进行改变。
第三、锯齿状第一表面A中的锯齿的形状可以统一为一种形状也可以为不同的形状。
第四、在锯齿状第一表面A中的锯齿的形状统一为一种形状的情况下，本发明对每个锯齿的大小不做限定。即每个锯齿的大小可以均相等，也可以不相等。
例如，如图5所示，在上述发光二极管141的发光角度α为120度的情况下，上述第一表面A的锯齿截面形状均可以为等腰三角形；且该等腰三角形的顶角β的角度范围可以包括70°～100°。这样一来，光学透镜20的每一个锯齿可以为等腰三角柱。这样的光学透镜20由于锯齿结构统一，因此利于加工和精度控制。并且，当采用常规距离设置发光二极管141和导光板13的位置时，具有上述锯齿结构的第一表面A能够最大限度的对发光角度α内的所有光线进行聚拢，最终将其照射导光板中。从而大大提高了背光模组的出光率，降低了功耗。
第五、当采用树脂材料制作上述光学透镜20时，构成该光学透镜20的材料可以包括一些透光性较高的材料，例如：聚甲基丙烯酸甲酯PMMA、聚氯乙烯PVC、聚乙烯PE、聚碳酸酯PC以及聚丙烯PP中的至少一种。
本发明至少一实施例提供一种显示装置，包括如上所述的任意一种背光模组，具有与前述实施例中的背光模组相同的结构和有益效果。由于前述实施例已经对背光模组的结构及有益效果进行了描述，在此不再赘述。
需要说明的是，在本发明至少一实施例中，显示装置具体可以包括液晶 显示装置，例如该显示装置可以为液晶显示器、液晶电视、数码相框、手机或平板电脑等任何具有显示功能的产品或者部件。
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。
本申请要求于2014年10月13日递交的中国专利申请第201410539438.7号的优先权，在此全文引用上述中国专利申请公开的内容以作为本申请的一部分。

Claims (9)

  1. 一种背光模组，包括：导光板、位于导光板入光侧的发光二极管、以及设置于所述发光二极管出光侧与所述导光板入光侧之间的光学透镜；
    其中，所述光学透镜靠近所述发光二极管的第一表面为锯齿状。
  2. 根据权利要求1所述的背光模组，其中，所述光学透镜与所述导光板为一体结构。
  3. 根据权利要求1所述的背光模组，其中，将所述光学透镜远离所述发光二极管的第二表面贴附于所述导光板的入光侧表面。
  4. 根据权利要求3所述的背光模组，其中，所述第二表面为平板状。
  5. 根据权利要求1所述的背光模组，其中，所述光学透镜设置于所述发光二极管的表面，并将所述发光二极管进行封装。
  6. 根据权利要求1-5任一项所述的背光模组，其中，所述第一表面的锯齿截面形状包括三角形、矩形、梯形中的至少一种。
  7. 根据权利要求6所述的背光模组，其中，在所述发光二极管的发光角度为120°的情况下，所述第一表面的锯齿截面形状均为等腰三角形；且所述等腰三角形的顶角角度范围包括70°～100°。
  8. 根据权利要求3或5所述的背光模组，其中，构成所述光学透镜的材料包括：聚甲基丙烯酸甲酯、聚氯乙烯、聚乙烯、聚碳酸酯或聚丙烯中至少一种。
  9. 一种显示装置，包括如权利要求1-8任一项所述的背光模组。
PCT/CN2015/074667 2014-10-13 2015-03-20 背光模组及显示装置 WO2016058332A1 (zh)

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