WO2014015547A1 - 背光模块及显示装置 - Google Patents

背光模块及显示装置 Download PDF

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Publication number
WO2014015547A1
WO2014015547A1 PCT/CN2012/080347 CN2012080347W WO2014015547A1 WO 2014015547 A1 WO2014015547 A1 WO 2014015547A1 CN 2012080347 W CN2012080347 W CN 2012080347W WO 2014015547 A1 WO2014015547 A1 WO 2014015547A1
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WO
WIPO (PCT)
Prior art keywords
recesses
light
backlight module
recess
guide sheet
Prior art date
Application number
PCT/CN2012/080347
Other languages
English (en)
French (fr)
Inventor
顾毓波
贾沛
杨流洋
Original Assignee
深圳市华星光电技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US13/636,700 priority Critical patent/US9128227B2/en
Publication of WO2014015547A1 publication Critical patent/WO2014015547A1/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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02B6/0015—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
    • G02B6/002—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 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—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 by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • 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
    • 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
    • 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

  • the present invention relates to a liquid crystal display technology, and in particular to a backlight module and a display device therefor.
  • Liquid crystal display (Liquid Crystal Display, LCD) has been widely used in a variety of electronic products, most of the liquid crystal display is a backlight type liquid crystal display, which is composed of a liquid crystal display panel and a backlight module (backlight Module).
  • the backlight module can be divided into a side-light type and a direct-light type according to the incident position of the light source (Direct-light) Type) Two to provide a backlight to the LCD panel.
  • Direct-light Direct-light
  • a direct-lit backlight module as an example, which can use multiple lamps or light bars (light Bars are used as a light source to provide a backlight to the liquid crystal display panel.
  • the back frame of the backlight module needs to reserve space for installing the light source, which is disadvantageous for the narrow frame (Slim Bezel) design.
  • the direct-lit light-incident backlight module since a large number of light sources are required to form the surface light source, cost and energy consumption are increased.
  • the invention provides a backlight module and a display device to solve the problem of forming a surface light source of the backlight module.
  • a main object of the present invention is to provide a backlight module, including:
  • the light guide sheet includes a plurality of first recesses and second recesses, the first recesses are formed on a bottom surface of the light guide sheet, and the light source is a capacitor
  • the first recess is disposed in the first recess, and the second recess is formed on the light-emitting surface of the light guide sheet.
  • Another object of the present invention is to provide a backlight module, including:
  • the light guide sheet includes a plurality of first recesses and second recesses, the first recesses are formed on a bottom surface of the light guide sheet, and the light source is a capacitor
  • the first recess is disposed in the light-emitting surface of the light guide sheet, and a first angle is formed between the slope of the first recess and the bottom surface, the first The angle is from 90 degrees to 165 degrees, the second concave portion has a second angle between the inclined surface and the light emitting surface, and the second angle is 110 degrees to 175 degrees.
  • Another object of the present invention is to provide a display device including:
  • the backlight module includes:
  • the light guide sheet includes a plurality of first recesses and second recesses, the first recesses are formed on a bottom surface of the light guide sheet, and the light source is a capacitor
  • the first recess is disposed in the first recess, and the second recess is formed on the light-emitting surface of the light guide sheet.
  • the first recess and/or the second recess have a circular arc or a trapezoidal cross-sectional shape.
  • one of the second recesses is located above each of the first recesses, and the width of the second recesses is the same or larger than the width of each of the first recesses.
  • a plurality of the second recesses are located above each of the first recesses, and a width of the second recesses is smaller than a width of each of the first recesses, The arrangement area of the two recesses is larger than the opening size of each of the first recesses.
  • the second recesses have a space therebetween.
  • the light-emitting surface of the light guide sheet is provided with a plurality of protruding structures, and the protruding structures are formed at intervals between the second recesses.
  • the slope of the first recess has a first angle with the bottom surface, and the first angle is 90 degrees to 165 degrees.
  • the slope of the second recess has a second angle with the light exiting surface, and the second angle is 110 degrees to 175 degrees.
  • the light guide sheet may further include a fluorescent layer formed on an inner surface of each of the first recesses.
  • the backlight module and the display device of the present invention can uniformly light the light source through the light guide sheet to form a uniform planar light source. Moreover, the first concave portion and the second concave portion of the light guide sheet can sufficiently diffuse the light of the light source laterally to form a more uniform surface light source, thereby reducing the number of light sources, thereby reducing the cost and energy consumption of the backlight module.
  • FIG. 1 is a partial cross-sectional view showing a backlight module and a display panel of a first embodiment of the present invention
  • FIGS. 2 and 3 are schematic views showing a light guide sheet according to an embodiment of the present invention.
  • FIG. 4 is a partial cross-sectional view showing a light guide sheet according to another embodiment of the present invention.
  • Figure 5 shows a partial cross-sectional view of a light guide sheet in accordance with yet another embodiment of the present invention.
  • the word “comprising” is to be understood to include the component, but does not exclude any other component.
  • “on” means located above or below the target component, and does not mean that it must be on the top based on the direction of gravity.
  • FIG. 1 shows a partial cross-sectional view of a backlight module and a display panel according to an embodiment of the invention.
  • the backlight module 100 of the present embodiment can be disposed relative to a display panel 101.
  • the display panel 101 can be a liquid crystal display panel to form a display device such as a liquid crystal display device.
  • the backlight module 100 can include a back plate 110 , a plurality of light sources 120 , a substrate 130 , a reflective layer 140 , and a light guide sheet 150 .
  • the back plate 110 of the present embodiment is made of an opaque material, such as a plasticized material, a metal material, or a combination thereof, for carrying the light source 120 , the substrate 130 , and the light guide sheet 150 .
  • the light source 120 is disposed on the substrate 130 for providing light to the display panel 101.
  • the light source 120 can be a point source (point Light source), such as Light-Emitting Diode (LED), Organic Light Emitting Diode, OLED) or Electro-Luminescence (EL) components.
  • the light source 120 can be a plurality of light emitting diode chips arranged on the substrate 130 and having a predetermined interval between each two adjacent light sources 120.
  • the substrate 130 is a rectangular plate body.
  • the substrate 130 can be a circuit board, such as a printed substrate (Printed Circuit board, PCB) or flexible printed substrate (Flexible Printed Circuits (FPC) are disposed on the backplane 110 and electrically connected to the light source 120 for controlling the illumination of the light source 120.
  • PCB printed substrate
  • FPC Flexible Printed Circuits
  • the reflective layer 140 of the present embodiment may be disposed on a surface of the substrate 130 and formed between the light sources 120 .
  • the reflective layer 140 can be a reflective plate, a reflective sheet or a reflective coating for reflecting light.
  • the reflective layer 140 is made of a high reflectivity material such as silver, aluminum, gold, chromium, copper, indium, antimony, nickel, platinum, rhodium, iridium, tin, antimony, tungsten, manganese, any combination thereof. Alloy or white reflective paint resistant to yellowing and heat.
  • the light guide sheet 150 of the present embodiment can be formed by injection molding (Injection). Molding), stamping, cutting, precision casting, casting, machining, die casting or forging.
  • the material of the light guiding sheet 150 is, for example, glass, photocurable resin, polymethyl methacrylate (PMMA) or polycarbonate (PC).
  • the light guide sheet 150 includes a light emitting surface 151, a bottom surface 152, a plurality of first concave portions 153, and a plurality of second concave portions 154.
  • the light-emitting surface 151 is formed on one side of the light guide sheet 150 and faces the liquid crystal display panel 101 for allowing the light of the light source 120 to be emitted to the liquid crystal display panel 101.
  • the bottom surface 152 is formed on the other side of the light guide sheet 150 and faces the substrate 130.
  • the first recess 153 of the light guide sheet 150 is formed on the bottom surface 152 for receiving and encapsulating the light source 120.
  • the opening area of each of the first recesses 153 is at least greater than the width of each of the light sources 120 such that the light source 120 is received in the first recess 153 of the light guide sheet 150.
  • the second recess 154 is formed on the light exit surface 151 for further diffusing the light of the light source 120.
  • the shape or size of the recesses of the first recess 153 and the second recess 154 can also be adjusted to form an optimal and uniform surface light source, depending on the actual needs of the user.
  • the inclined surface of the first concave portion 153 or the curved surface of the curved surface and the bottom surface 152 may have a first angle ⁇ 1 , and the first angle ⁇ 1 may be 90 degrees. ⁇ 165 degrees, for example, 110 degrees to 155 degrees, the slope of the second concave portion 154 or a curved surface thereof and the light exit surface 151 may have a second angle ⁇ 2, and the second angle ⁇ 2 may be 110 degrees to 175 degrees, for example, 120 degrees. ⁇ 170 degrees.
  • FIG. 2 and FIG. 3 are schematic diagrams showing a light guide sheet according to an embodiment of the invention.
  • the first recess 153 and/or the second recess 154 may have a circular arc shape (as shown in FIGS. 1 and 3) or a trapezoidal cross-sectional shape (as shown in FIG. 2), and may serve as a concave lens (concave). Lens) for diffusing light from the light source 120.
  • the depth of the first recess 153 may be greater than the depth of the second recess 154 such that light emitted by the light source 120 may be sufficiently emitted through the first recess 153 to ensure a light diffusing effect.
  • each two adjacent first recesses 153 there is a spacing between each two adjacent first recesses 153, and the second recesses 154 may or may not have a spacing therebetween.
  • at least one (or more) The second recess 154 is located above each of the first recesses 153 for allowing light from the first recess 153 to pass through the second recess 154.
  • a second recess 154 is located above each first recess 153, and the width (or diameter) of each second recess 154 may be the same or greater than each first The width (or diameter) of the recess 153.
  • FIG. 1 As shown in FIG.
  • a plurality of second recesses 154 are located above each of the first recesses 153, and a width (or diameter) of each of the second recesses 154 may be smaller than each of the first recesses.
  • the width (or diameter) of the 153, and the arrangement area of the second recesses 154 may be larger than the opening size of each of the first recesses 153.
  • the light of the light source 120 when the light source 120 emits light, the light of the light source 120 can be diffused and homogenized by the first concave portion 153 of the light guide sheet 150 to achieve the effect of light mixing.
  • the light When light is emitted through the second recess 154 on the light exit surface 151, the light can be further diffused, thereby providing a more uniform surface light source to the liquid crystal display panel 101.
  • the first concave portion 153 and the second concave portion 154 of the light guide sheet 150 the light of the light source 120 can be sufficiently diffused laterally, thereby increasing the spacing between the light sources 120, that is, reducing the number of the light sources 120 to reduce the backlight.
  • the cost and energy consumption of module 100 The cost and energy consumption of module 100.
  • the light guide sheet 150 further includes a fluorescent layer 155 formed on an inner surface of each of the first recesses 153 and excited by the light of the light source 120 to emit visible light. Therefore, by the fluorescent layer 155, the luminous efficiency of the light source 120 can be improved or the light color of the light source 120 can be changed.
  • the substrate 130 on which the light source 120 is arranged may be first disposed on the back plate 110, and then the light guide sheet 150 may be disposed on the substrate 130. At this time, the light source 120 is correspondingly received and packaged in the first recess 153 of the light guide sheet 150. Next, the display panel 101 is disposed on the light guide sheet 150 to complete the display device.
  • the light of the light source 120 of the backlight module 100 can be homogenized to form a uniform planar light source. Since the light of the light source 120 is mixed by the concave lens of the light guide sheet 150 in advance, the light mixing space required for the light can be shortened, and the thickness of the backlight module 100 can be reduced. Furthermore, the first concave portion 153 and the second concave portion 154 of the light guide sheet 150 can sufficiently diffuse the light of the light source 120 laterally to form a more uniform surface light source, thereby reducing the number of light sources to reduce the backlight module 100. Cost and energy consumption.
  • the light-emitting surface 151 of the light guide sheet 150 may be provided with a plurality of protruding structures 156 to further correct the direction of the light to increase the light collecting effect and improve the front luminance.
  • the protruding structures 156 may be, for example, prismatic or semi-circular protruding structures or the like.
  • the light-emitting surface 151 may have a matte finish or a scattering point design to homogenize the light of the light source 120 and reduce the phenomenon of light unevenness (Mura).
  • the protruding structures 156 can be formed at intervals between the second recesses 154 to improve the brightness between the second recesses 154, that is, the brightness of the gap between the light sources 120 can be improved, and the backlight uniformity of the backlight module can be further improved.
  • the backlight module and the display device of the present invention can homogenize the light of the light source through the light guide sheet to form a uniform planar light source. Furthermore, the first concave portion and the second concave portion of the light guide sheet can sufficiently diffuse the light of the light source laterally to form a more uniform surface light source, thereby reducing the number of light sources, thereby reducing the cost and energy consumption of the backlight module.

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

Abstract

一种背光模块及显示装置，其中显示装置包括该背光模块（100）和显示面板（101）。背光模块（100）包括基板（130）；多个光源（120），设置于基板（130）上；以及导光片（150），设置于基板（130）上，其中导光片（150）包括多个第一凹部（153）及第二凹部（154）。光源（120）容置于第一凹部（153）内，且第二凹部（154）形成于出光面（151）上。该背光模块及显示装置可形成均匀的面光源。

Description

背光模块及显示装置 技术领域
本发明涉及一种液晶显示技术，特别是涉及一种背光模块及其应用的显示装置。
 背景技术
液晶显示器(Liquid Crystal Display，LCD)已被广泛应用于各种电子产品中，液晶显示器大部分为背光型液晶显示器，其是由液晶显示面板及背光模块(backlight module)所组成。背光模块可依照光源入射位置的不同分成侧向式入光(Side-light type)与直下式入光(Direct-light type)两种，以便提供背光源至液晶显示面板。以直下式的背光模块为例，其可使用多个灯管或灯条(light bars)来作为光源，以提供一背光给液晶显示面板。
然而，在侧向式入光背光模块中，由于光源是设置于导光板的侧边，因此，背光模块的背框需预留空间来安装光源，而不利于窄边框(Slim Bezel)设计。又，在直下式入光背光模块中，由于需较多的光源来形成面光源，因而增加成本及能源耗费。
故，有必要提供一种背光模块及显示装置，以解决现有技术所存在的问题。
 技术问题
本发明提供一种背光模块及显示装置，以解决背光模块的面光源的形成问题。
 技术解决方案
本发明的主要目的在于提供一种背光模块，其包括：
基板；
多个光源，设置于所述基板上；以及
导光片，设置于所述基板上，其中所述导光片包括多个第一凹部及第二凹部，所述第一凹部是形成于所述导光片的底面上，所述光源是容置于所述第一凹部内，所述第二凹部是形成于所述导光片的出光面上。
本发明的另一目的在于提供一种背光模块，其包括：
基板；
多个光源，设置于所述基板上；以及
导光片，设置于所述基板上，其中所述导光片包括多个第一凹部及第二凹部，所述第一凹部是形成于所述导光片的底面上，所述光源是容置于所述第一凹部内，所述第二凹部是形成于所述导光片的出光面上，所述第一凹部的斜面与所述底面之间具有一第一角度，所述第一角度为90度~165度，所述第二凹部的斜面与所述出光面之间具有一第二角度，所述第二角度为110度~175度。
本发明的另一目的在于提供一种显示装置，其包括：
显示面板；以及
背光模块，包括：
基板；
多个光源，设置于所述基板上；以及
导光片，设置于所述基板上，其中所述导光片包括多个第一凹部及第二凹部，所述第一凹部是形成于所述导光片的底面上，所述光源是容置于所述第一凹部内，所述第二凹部是形成于所述导光片的出光面上。
在本发明的一实施例中，所述第一凹部及/或所述第二凹部具有圆弧形或梯形剖面形状。
在本发明的一实施例中，一个所述第二凹部是对位于每一所述第一凹部的上方，所述第二凹部的宽度相同或大于每一所述第一凹部的宽度。
在本发明的一实施例中，多个所述第二凹部是对位于每一所述第一凹部的上方，所述第二凹部的宽度小于每一所述第一凹部的宽度，所述第二凹部的排列面积大于每一所述第一凹部的开口尺寸。
在本发明的一实施例中，所述第二凹部之间具有间隔。
在本发明的一实施例中，所述导光片的出光面设有多个突出结构，所述突出结构是形成于所述第二凹部之间的间隔处。
在本发明的一实施例中，所述第一凹部的斜面与所述底面之间具有一第一角度，所述第一角度为90度~165度。
在本发明的一实施例中，所述第二凹部的斜面与所述出光面之间具有一第二角度，所述第二角度为110度~175度。
在本发明的一实施例中，所述导光片更可包括荧光层，所述荧光层是形成于每一所述第一凹部的内表面。
 有益效果
本发明的背光模块及显示装置可通过导光片来均匀光源的光线，以形成一均匀的平面光源。又，通过导光片的第一凹部及第二凹部，可充分地横向扩散光源的光线，以形成更均匀的面光源，进而可减少光源的数量，以降低背光模块的成本及能量耗费。
 附图说明
图1显示本发明的第一实施例的背光模块与显示面板的部分剖面示意图；
图2及图3显示依照本发明的一实施例的导光片的示意图；
图4显示依照本发明的另一实施例的导光片的部分剖面示意图；以及
图5显示依照本发明的又一实施例的导光片的部分剖面示意图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。
附图和说明被认为在本质上是示出性的，而不是限制性的。在图中，结构相似的单元是以相同标号表示。另外，为了理解和便于描述，附图中示出的每个组件的尺寸和厚度是任意示出的，但是本发明不限于此。
在附图中，为了清晰起见，夸大了层、膜、面板、区域等的厚度。在附图中，为了理解和便于描述，夸大了一些层和区域的厚度。将理解的是，当例如层、膜、区域或基底的组件被称作“在”另一组件“上”时，所述组件可以直接在所述另一组件上，或者也可以存在中间组件。
另外，在说明书中，除非明确地描述为相反的，否则词语“包括”将被理解为意指包括所述组件，但是不排除任何其它组件。此外，在说明书中，“在......上”意指位于目标组件上方或者下方，而不意指必须位于基于重力方向的顶部上。
请参照图1，其显示依照本发明的一实施例的背光模块与显示面板的部分剖面示意图。本实施例的背光模块100可相对于一显示面板101来设置，所述显示面板101可为液晶显示面板，而形成一显示装置，如液晶显示装置等。背光模块100可包括背板110、多个光源120、基板130、反射层140及导光片150。
如图1所示，本实施例的背板110是由不透光材质所制成，例如：塑化材料、金属材料或上述材料的组合，用以承载光源120、基板130及导光片150。光源120是设置在基板130上，用来为显示面板101提供光线。在本实施例中，光源120可为点光源(point light source)，例如发光二极管(Light-Emitting Diode，LED)、有机发光二极管(Organic Light Emitting Diode，OLED)或电激发光(Electro-Luminescence，EL)组件。在本实施例中，光源120可为多个发光二极管芯片，其排列于基板130上，且每二相邻光源120之间具有一预设间隔。
如图1所示，基板130为矩形板体。在本实施例中，基板130可为电路板，例如印刷基板(Printed circuit board，PCB)或柔性印刷基板(Flexible Printed Circuits，FPC)，其设置在背板110上，并电性连接于光源120，用于控制光源120的发光。
如图1所示，本实施例的反射层140可设置于基板130的表面上，并形成于这些光源120之间。反射层140可为反射板、反射片或反射涂层，用来反射光线。此反射层140是由高反射率材料所制成，例如银、铝、金、铬、铜、铟、铱、镍、铂、铼、铑、锡、钽、钨、锰、其上述任意组合的合金或耐黄化且耐热的白色反射漆料等。
如图1所示，本实施例的导光片150可利用射出成型(Injection Molding)、冲压、裁切、精密铸造、铸造、机械加工、压铸或锻造方式来一体成型。导光片150的材料例如为玻璃、光硬化型树脂、聚甲基丙烯酸甲酯(PMMA)或聚碳酸酯(PC)。导光片150包括出光面151、底面152、多个第一凹部153及多个第二凹部154。出光面151是形成于导光片150的一侧，并面对液晶显示面板101，用以允许光源120的光线被发出至液晶显示面板101。底面152是形成于导光片150的另一侧，并面对于基板130。导光片150的第一凹部153是形成于底面152上，用以容置及封装光源120。每一第一凹部153的开口面积是至少大于每一光源120的宽度，以使光源120容置于导光片150的第一凹部153内。第二凹部154是形成于出光面151上，用于进一步扩散光源120的光线。依据使用者的实际需求，第一凹部153及第二凹部154的凹部形状或尺寸亦可被调整，以形成最佳的且均匀的面光源。
如图1所示，此外，为确保导光片150的光线扩散效果，第一凹部153的斜面或其曲面切线与底面152之间可具有一第一角度θ1，第一角度θ1可为90度~165度，例如110度~155度，第二凹部154的斜面或其曲面切线与出光面151之间可具有一第二角度θ2，第二角度θ2可为110度~175度，例如120度~170度。
请参照图1至图3，图2及图3显示依照本发明的一实施例的导光片的示意图。第一凹部153及/或第二凹部154可具有圆弧形(如图1及图3所示)或梯形剖面形状(如图2所示)，且可作为凹透镜(concave lens)，用以扩散光源120的光线。第一凹部153的深度可大于第二凹部154的深度，使得光源120所发出的光线可充分地通过第一凹部153来发出，确保光线扩散效果。对应于光源120的配置，每二相邻第一凹部153之间具有一间距，第二凹部154之间可选择性具有或未具有间隔。其中，至少一个(或多个) 第二凹部154是对位于每一第一凹部153的上方，用于允许由第一凹部153来的光线可对应通过第二凹部154。在一实施例中，如图1所示，一个第二凹部154是对位于每一第一凹部153的上方，且每一第二凹部154的宽度(或直径)可相同或大于每一第一凹部153的宽度(或直径)。在另一实施例中，如图3所示，多个第二凹部154是对位于每一第一凹部153的上方，每一第二凹部154的宽度(或直径)可小于每一第一凹部153的宽度(或直径)，且这些第二凹部154的排列面积可大于每一第一凹部153的开口尺寸。
如图1所示，当光源120发出光线时，通过导光片150的第一凹部153，光源120的光线可被扩散且均匀化，而达到混光的效果。当光线穿过出光面151上的第二凹部154来发出时，光线可进一步被扩散，因而可提供一更均匀的面光源至液晶显示面板101。通过导光片150的第一凹部153及第二凹部154，光源120的光线可充分地被横向扩散，因而可增加光源120之间的间距，亦即可减少光源120的设置数量，以降低背光模块100的成本及能量耗费。
请参照图4，其显示依照本发明的另一实施例的导光片的部分剖面示意图。在另一实施例中，导光片150更可包括荧光层155，荧光层155是形成于每一第一凹部153的内表面，并可被光源120的光线所激发，而发出可见光。因此，通过荧光层155，可改善光源120的发光效率或改变光源120的光色。
当组装本实施例的显示装置时，排列有光源120的基板130可先设置于背板110上，接着，可设置导光片150于基板130上。此时，光源120是对应地容设及封装于导光片150的第一凹部153内。接着，设置显示面板101于导光片150上，以完成显示装置。
因此，通过本实施例的导光片150，可均匀化背光模块100的光源120的光线，以形成一均匀的平面光源。由于光源120的光线是预先利用导光片150的凹透镜来进行混光，因而可缩短光线所需的混光空间，而可减少背光模块100的厚度。再者，通过导光片150的第一凹部153及第二凹部154，可充分地横向扩散光源120的光线，以形成更均匀的面光源，进而可减少光源的数量，以降低背光模块100的成本及能量耗费。
请参照图5，其显示依照本发明的又一实施例的导光片的部分剖面示意图。在又一实施例中，导光片150的出光面151可设有多个突出结构156，以便进一步修正光线的方向，来增加聚光效果，并提高正面辉度。其中此些突出结构156可例如为：棱形或半圆形的突出结构等。再者，出光面151更可具有雾面处理或散射点设计，以便均匀化光源120的光线，减少出光不均(Mura)的现象。又，这些突出结构156可形成于第二凹部154之间的间隔处，以提高第二凹部154之间的亮度，亦即可提高光源120之间隙隔的亮度，进一步改善背光模块的背光均匀性。
由上述可知，本发明的背光模块及显示装置可通过导光片来均匀化光源的光线，以形成一均匀的平面光源。再者，通过导光片的第一凹部及第二凹部，可充分地横向扩散光源的光线，以形成更均匀的面光源，进而可减少光源的数量，以降低背光模块的成本及能量耗费。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
序列表自由内容

Claims (17)

1. .一种背光模块，包括：
基板；
多个光源，设置于所述基板上；以及
导光片，设置于所述基板上，其中所述导光片包括多个第一凹部及第二凹部，所述第一凹部是形成于所述导光片的底面上，所述光源是容置于所述第一凹部内，所述第二凹部是形成于所述导光片的出光面上，所述第一凹部的斜面与所述底面之间具有一第一角度，所述第一角度为90度~165度，所述第二凹部的斜面与所述出光面之间具有一第二角度，所述第二角度为110度~175度。
2.根据权利要求1所述的背光模块，其中所述第一凹部及/或所述第二凹部具有圆弧形或梯形剖面形状。
根据权利要求1所述的背光模块，其中一个所述第二凹部是对位于每一所述第一凹部的上方，所述第二凹部的宽度相同或大于每一所述第一凹部的宽度。
根据权利要求1所述的背光模块，其中多个所述第二凹部是对位于每一所述第一凹部的上方，所述第二凹部的宽度小于每一所述第一凹部的宽度。
根据权利要求1所述的背光模块，其中所述第二凹部之间具有间隔。
根据权利要求5所述的背光模块，其中所述导光片的出光面设有多个突出结构，所述突出结构是形成于所述第二凹部之间的间隔处。
根据权利要求1所述的背光模块，其中所述导光片更可包括荧光层，所述荧光层是形成于每一所述第一凹部的内表面。
一种背光模块，包括：
基板；
多个光源，设置于所述基板上；以及
导光片，设置于所述基板上，其中所述导光片包括多个第一凹部及第二凹部，所述第一凹部是形成于所述导光片的底面上，所述光源是容置于所述第一凹部内，所述第二凹部是形成于所述导光片的出光面上。
根据权利要求8所述的背光模块，其中所述第一凹部及/或所述第二凹部具有圆弧形或梯形剖面形状。
根据权利要求8所述的背光模块，其中一个所述第二凹部是对位于每一所述第一凹部的上方，所述第二凹部的宽度相同或大于每一所述第一凹部的宽度。
根据权利要求8所述的背光模块，其中多个所述第二凹部是对位于每一所述第一凹部的上方，所述第二凹部的宽度小于每一所述第一凹部的宽度，所述第二凹部的排列面积大于每一所述第一凹部的开口尺寸。
根据权利要求8所述的背光模块，其中所述第二凹部之间具有间隔。
根据权利要求12所述的背光模块，其中所述导光片的出光面设有多个突出结构，所述突出结构是形成于所述第二凹部之间的间隔处。
根据权利要求8所述的背光模块，其中所述第一凹部的斜面与所述底面之间具有一第一角度，所述第一角度为90度~165度。
根据权利要求8所述的背光模块，其中所述第二凹部的斜面与所述出光面之间具有一第二角度，所述第二角度为110度~175度。
根据权利要求8所述的背光模块，其中所述导光片更可包括荧光层，所述荧光层是形成于每一所述第一凹部的内表面。
一种显示装置，包括：
显示面板；以及
背光模块，包括：
基板；
多个光源，设置于所述基板上；以及
导光片，设置于所述基板上，其中所述导光片包括多个第一凹部及第二凹部，所述第一凹部是形成于所述导光片的底面上，所述光源是容置于所述第一凹部内，所述第二凹部是形成于所述导光片的出光面上。
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