WO2017173700A1 - 背光模组及液晶显示装置 - Google Patents

背光模组及液晶显示装置 Download PDF

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Publication number
WO2017173700A1
WO2017173700A1 PCT/CN2016/081506 CN2016081506W WO2017173700A1 WO 2017173700 A1 WO2017173700 A1 WO 2017173700A1 CN 2016081506 W CN2016081506 W CN 2016081506W WO 2017173700 A1 WO2017173700 A1 WO 2017173700A1
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Prior art keywords
light
quantum dot
guide plate
disposed
light guide
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PCT/CN2016/081506
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English (en)
French (fr)
Inventor
白柏
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深圳市华星光电技术有限公司
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Priority to US15/112,143 priority Critical patent/US20180107064A1/en
Publication of WO2017173700A1 publication Critical patent/WO2017173700A1/zh

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    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133603Direct backlight with LEDs
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/0056Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing elements
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0013Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023Means 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
    • G02B6/0025Diffusing sheet or layer; Prismatic sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/13362Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133621Illuminating devices providing coloured light
    • GPHYSICS
    • G02OPTICS
    • G02BOPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011Light 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
    • G02B6/0033Means for improving the coupling-out of light from the light guide
    • G02B6/005Means 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
    • G02B6/0055Reflecting element, sheet or layer
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133528Polarisers
    • G02F1/133548Wire-grid polarisers
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133602Direct backlight
    • G02F1/133606Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607Direct 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
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133614Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • GPHYSICS
    • G02OPTICS
    • G02FOPTICAL 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
    • G02F1/00Devices 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
    • G02F1/01Devices 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 
    • G02F1/13Devices 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
    • G02F1/133Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333Constructional arrangements; Manufacturing methods
    • G02F1/1335Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336Illuminating devices
    • G02F1/133615Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the red light quantum dot and the green light quantum dot are dispersed in the same quantum dot film, and the quantum dot film is disposed between the blue LED and the light incident surface of the light guide plate or on the light emitting surface of the light guide plate.
  • the light guide plate 21 includes a light incident surface 211 and a light emitting surface 212 and a reflecting surface 213 which are respectively connected to the light incident surface 211 and disposed opposite to each other.
  • the light-emitting surface 212 is the light guide plate 21
  • the upper surface, the reflecting surface 213 is the light guide plate 21
  • the lower surface, the light incident surface 211 is a side surface connecting the upper surface and the lower surface. It should be understood that the light guide plate 21 may further include two light incident surfaces 211, that is, the other light incident surface is a side surface opposite to the light incident surface 211 shown in FIG.
  • the liquid crystal panel 10 further includes a built-in metal wire grid polarizing film 14 , that is, the metal wire grid polarizing film 14 is disposed between the array substrate of the liquid crystal panel 10 and the color filter substrate, and the metal wire grid polarizing film 14 is disposed on the guide.
  • Light board 21 The light-emitting surface 212 and the liquid crystal layer 13 are disposed adjacent to the side of the liquid crystal layer 13 facing the light guide plate 21, as shown in FIG. 1, that is, the metal wire grid polarizing film 14 is disposed on the second substrate shown in FIG. The upper surface of 12.
  • the metal wire grid of the metal wire grid polarizing film 14 can be directly formed on the glass substrate of the second substrate 12 of the liquid crystal panel 10, that is, the metal wire grid polarizing film 14 and the second substrate 12 share a glass substrate.
  • the white light formed by the light source 22 is incident on the light guide plate 21 through the light incident surface 211 at a predetermined angle, wherein the predetermined angle is greater than zero and less than 90 degrees, and the light guide plate 21 converts the light source 22 into a surface light source.
  • the light component P1 perpendicular to the metal wire grid is effectively utilized, and the light component S parallel to the metal wire grid is reflected into the quarter wave plate 24, and the quarter wave plate 24
  • the reflected light (light component S) is converted into circularly polarized light, and after being reflected by the reflection sheet 25, the direction of the circularly polarized light is reversed (for example, the left-handed circularly polarized light becomes a right-handed circularly-polarized light, or the right-handed circularly polarized light becomes a left-handed circular Polarized light), the reversed circularly polarized light P2 is again converted into polarized light perpendicular to the metal wire grid after passing through the quarter wave plate 24, so that the light reflected by the metal wire grid polarizing film 14 can be effectively utilized, thereby improving Light utilization.
  • the embodiment of the present invention replaces the lower polarizer with a metal wire grid polarizing film, and adds a quarter wave plate to the reflection sheet.
  • the light emitted by the light source enters the metal wire grid polarizing film and is perpendicular to the metal line.
  • the light component of the grid is effectively utilized, and the light component parallel to the metal grid is reflected into the quarter-wave plate, and the quarter-wave plate converts the reflected light into circularly polarized light, which is reflected by the reflective sheet and rounded.

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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)
  • Polarising Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

一种背光模组及液晶显示装置,利用金属线栅偏光膜(14)代替下偏光片,并在反射片(25)上增加一层四分之一波片(24),光源(22)发出的光进入金属线栅偏光膜(14)后,垂直于金属线栅的光分量(P1)被有效利用,平行于金属线栅的光分量(S)被反射进入四分之一波片(24),四分之一波片(24)将反射的光分量(S)转变为圆偏振光,并经过反射片(25)反射后,圆偏振光方向逆转,逆转后的圆偏振光(P2)再次经过四分之一波片(24)后转变为垂直于金属线栅的偏振光,从而使得被金属线栅偏光膜(14)反射的光也能够被有效利用,提高光的利用率。

Description

背光模组及液晶显示装置
【技术领域】
本发明实施例涉及液晶显示(Liquid crystal display, LCD)技术领域,具体涉及一种其背光模组及具有该背光模组的液晶显示装置。
【背景技术】
液晶显示装置包括显示面板和背光模组,其中,背光模组是为液晶显示装置提供光源的组件,通常设置与液晶面板的下方,以提供均匀发散和一定亮度的光至液晶面板,从而根据液晶面板上的像素电极的不同电压来形成不同亮度、不同色彩和不同灰度的彩色画面。根据光源和导光板的位置关系,背光模组分为侧入式和直下式两种类型,其中侧入式背光模组因其具有厚度薄等优点更是被广泛应用。
在侧入式背光模组中,光源发出的光由侧面进入导光板,导光板将光转换成均匀分布的面光源后出射,并通过下偏光片后变为线偏振光到达液晶面板。但是,现有背光模组的下偏光片只能使线偏振光通过,即由导光板出射的光有部分无法通过该下偏光片,而这部分无法通过下偏光片的光则被浪费掉,导致光利用率低。
【发明内容】
鉴于此,本发明提供一种液晶显示装置及其背光模组,以解决光在传播过程中损失较大而导致的光利用率低的问题。
本发明实施例提供的一种背光模组,包括:导光板,包括至少一个入光面以及分别与至少一个入光面连接且相对设置的出光面和反射面;光源,邻近于入光面设置,光源包括蓝光LED和红光量子点、绿光量子点,蓝光LED发出的光、红光量子点发出的光及绿光量子点发出的光混合形成白光;扩散片,邻近于导光板的出光面设置;金属栅线偏光膜,设置于导光板的出光面一侧,扩散片设置于导光板和金属栅线偏光膜之间;四分之一波片,邻近于导光板的反射面设置,其中四分之一波片的快轴与金属栅线偏光膜的金属栅线的方向的夹角为45°;反射片,设置于四分之一波片背向导光板的一侧。
其中,红光量子点和绿光量子点分散于第一量子点膜和第二量子点膜中,第一量子点膜和第二量子点膜设置于蓝光LED和导光板的入光面之间或者设置于导光板的出光面上。
其中,红光量子点和绿光量子点分散于同一量子点膜中,量子点膜设置于蓝光LED和导光板的入光面之间或者设置于导光板的出光面上。
本发明实施例提供的一种背光模组,包括:导光板,包括至少一个入光面以及分别与至少一个入光面连接且相对设置的出光面和反射面;光源,邻近于入光面设置;金属栅线偏光膜,设置于导光板的出光面一侧;四分之一波片,邻近于导光板的反射面设置,其中四分之一波片的快轴与金属栅线偏光膜的金属栅线的方向的夹角为45°;反射片,设置于四分之一波片背向导光板的一侧。
其中,光源包括蓝光LED和红光量子点、绿光量子点,蓝光LED发出的光、红光量子点发出的光及绿光量子点发出的光混合形成白光。
其中,红光量子点和绿光量子点分散于第一量子点膜和第二量子点膜中,第一量子点膜和第二量子点膜设置于蓝光LED和导光板的入光面之间或者设置于导光板的出光面上。
其中,红光量子点和绿光量子点分散于同一量子点膜中,量子点膜设置于蓝光LED和导光板的入光面之间或者设置于导光板的出光面上。
其中,背光模组还包括扩散片,扩散片设置于导光板和金属线栅偏光膜之间。
本发明实施例提供的一种液晶显示装置,包括液晶面板以及为液晶面板提供光的背光模组,所述背光模组包括:导光板,包括至少一个入光面以及分别与至少一个入光面连接且相对设置的出光面和反射面;光源,邻近于入光面设置;金属栅线偏光膜,设置于导光板的出光面一侧;四分之一波片,邻近于导光板的反射面设置,其中四分之一波片的快轴与金属栅线偏光膜的金属栅线的方向的夹角为45°;反射片,设置于四分之一波片背向导光板的一侧。
其中,液晶面板包括第一基板和第二基板以及夹设于第一基板和第二基板之间的液晶层,金属线栅偏光膜设置于第一基板和第二基板之间,且于所述液晶层朝向导光板的一侧设置。
其中,液晶面板包括第一基板和第二基板以及夹设于第一基板和第二基板之间的液晶层,第二基板邻近于导光板的出光面设置,金属线栅偏光膜设置于第一基板和导光板的出光面之间。
其中,液晶面板还包括设置于第一基板背向液晶层一侧的偏光片,偏光片的透光轴的方向与金属线栅偏光膜的金属线栅的方向相垂直。
其中,背光模组还包括扩散片,扩散片设置于导光板和金属线栅偏光膜之间。
本发明实施例的背光模组及液晶显示装置,利用金属线栅偏光膜代替下偏光片,并在反射片上增加一层四分之一波片,光源发出的光进入金属线栅偏光膜后,垂直于金属线栅的光分量被有效利用,平行于金属线栅的光分量被反射进入四分之一波片,四分之一波片将反射的光转变为圆偏振光,并经过反射片反射后,圆偏振光方向逆转,逆转后的圆偏振光再次经过四分之一波片后转变为垂直于金属线栅的偏振光,从而使得被金属线栅偏光膜反射的光也能够被有效利用,提高光的利用率。
【附图说明】
图1是本发明的液晶显示装置一实施例的结构剖视图;
图2是本发明的金属线栅偏光膜一实施例的结构示意图。
【具体实施方式】
下面将结合本发明实施例中的附图,对本发明所提供的各个示例性的实施例的技术方案进行清楚、完整地描述。
图1是本发明的液晶显示装置一实施例的结构剖视图。请参阅图1所示,本实施例的液晶显示装置包括液晶面板10以及为液晶面板10提供背光的背光模组20,该背光模组20包括导光板21、光源22、金属栅线偏光膜23、四分之一波片24以及反射片25。
导光板21包括一个入光面211以及分别与入光面211连接且相对设置的出光面212和反射面213。其中,出光面212为导光板21 的上表面,反射面213为导光板21 的下表面,入光面211为连接上表面和下表面的侧表面。应该理解到,导光板21还可以包括两个入光面211,即另一个入光面是与图1所示的入光面211相对的侧表面。
邻近于入光面211设置一光源22,优选地,本实施例的光源22包括蓝光LED 221和至少一个量子点膜222,该至少一个量子点膜222分散有红光量子点和绿光量子点,红光量子点和绿光量子点可以分散于同一张量子点膜222中,也可分布于两张量子点膜222中,即红光量子点分散于第一量子点膜中且绿光量子点分散于第二量子点膜中。
以图1所示的一张量子点膜222为例,蓝光LED 221发出的蓝光经过量子点膜222和导光板21,量子点膜222中分散的红光量子点和绿光量子点吸收一部分蓝光后,红光量子点发出红光、绿光量子点发出绿光,剩余部分的蓝光和红光量子点发出红光以及绿光量子点发出绿光混合形成白光。其中,量子点膜222中分散的红光量子点是具有完全分立的电子能级,绿光量子点也是具有完全分立的电子能级,红光、绿光量子点受到光照射时,其价带和导带上的电子来回跃迁从而发射光。
基于此,在本实施例的光源22的结构设计中,蓝光LED 221和量子点膜222是两个独立的部分,且红光量子点发出红光为非常纯正的红单色光、绿光量子点发出绿光为非常纯正的绿单色光,因此可实现很高的色域,并且量子点膜222发出的红光、绿光也不会受到蓝光LED 221工作过程中产生的热量的影响,可避免容易发生色变的问题。
在本实施例中,量子点膜222只要设置于蓝光LED 221的光路上即可形成白光,具体地,量子点膜222(包括第一量子点膜和第二量子点膜)可以设置于蓝光LED 221和导光板21的入光面211之间,或者设置于导光板11的出光面212或反射面213上。
液晶面板10包括相对间隔的第一基板11和第二基板12,其中第一基板11和第二基板12中的一个为彩膜基板(Color Filter Substrate, 简称CF基板, 又称彩色滤光片基板),第一基板11和第二基板12中的另一个为阵列基板(Thin Film Transistor Substrate, 简称TFT基板, 又称薄膜晶体管基板或Array基板)以及填充于两基板之间的液晶层13,该液晶层13位于阵列基板和彩膜基板叠加形成的液晶盒内。
在上述基础上,液晶面板10还包括内置的金属线栅偏光膜14,即金属线栅偏光膜14设置于液晶面板10的阵列基板和彩膜基板之间,金属线栅偏光膜14设置于导光板21 的出光面212和液晶层13之间,具体邻近于液晶层13朝向导光板21的一侧设置,反映在图1所示,即金属线栅偏光膜14设置于图1所示的第二基板12的上表面。其中,金属线栅偏光膜14的金属线栅可直接形成于液晶面板10的第二基板12的玻璃基板上,即金属线栅偏光膜14和第二基板12共用玻璃基板。
请参阅图2所示的金属线栅偏光膜一实施例的结构示意图,垂直于金属线栅L的方向的光可以透过金属线栅偏光膜,而平行于金属线栅L的方向的光被反射。举例而言,Ia为入射光,而Ib和Ic为Ia的垂直分量和平行分量,所以Ib会透过金属线栅称为偏振光Tb,而入射光Ic只能被反射成为反射光Rc。
四分之一波片24邻近导光板21的反射面213。四分之一波片24是具有一定厚度的双折射单晶拨片,具有慢轴和快轴,慢轴所在的方向与光轴所在的方向垂直,快轴所在的方向与光轴所在的方向平行,所述光轴所在的方向是光不会产生双折射的传播方向。其中,四分之一波片24的快轴与金属栅线偏光膜14的金属栅线的方向的夹角为45°。
反射片25设置于四分之一波片24背向导光板21的一侧,用以反射自反射面213射出的光进入导光板21,从而减少光的损失。
结合图1所示,光源22形成的白光以预定角度经入光面211入射到导光板21,其中预定角度大于零且小于90°,导光板21将光源22转换为面光源。光进入金属线栅偏光膜14后,垂直于金属线栅的光分量P1被有效利用,平行于金属线栅的光分量S被反射进入四分之一波片24,四分之一波片24将反射的光(光分量S)转变为圆偏振光,并经过反射片25反射后,圆偏振光方向逆转(例如左旋圆偏振光变右旋圆偏振光,或右旋圆偏振光变左旋圆偏振光),逆转后的圆偏振光P2再次经过四分之一波片24后转变为垂直于金属线栅的偏振光,使得被金属线栅偏光膜14反射的光也能够被有效利用,提高光的利用率。
本发明实施例的液晶显示装置还可包括扩散片,扩散片设置于导光板21和金属线栅偏光膜14之间。具体地,该扩散片可贴附于液晶面板10的第二基板12的外表面,用于将从导光板21出射的光进一步散射,使得光更加均匀地射向液晶面板10。
在本发明实施例的结构设计中,鉴于利用金属线栅偏光膜14代替现有技术的下偏光片,所述液晶面板10还包括设置于第一基板11背向液晶层13一侧的偏光片15,即设置于液晶面板10的显示侧的上偏光片15,该上偏光片15的透光轴的方向与金属线栅偏光膜14的金属线栅的方向相垂直。应该理解到,本发明实施例的液晶显示装置还可以包括其他膜片结构,并不限于图1所示。
综上所述,本发明实施例利用金属线栅偏光膜代替下偏光片,并在反射片上增加一层四分之一波片,光源发出的光进入金属线栅偏光膜后,垂直于金属线栅的光分量被有效利用,平行于金属线栅的光分量被反射进入四分之一波片,四分之一波片将反射的光转变为圆偏振光,并经过反射片反射后,圆偏振光方向逆转,逆转后的圆偏振光再次经过四分之一波片后转变为垂直于金属线栅的偏振光,从而使得被金属线栅偏光膜反射的光也能够被有效利用,提高光的利用率。
应理解,以上所述仅为本发明的实施例,并非因此限制本发明的专利范围,凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换,例如各实施例之间技术特征的相互结合,或直接或间接运用在其他相关的技术领域,均同理包括在本发明的专利保护范围内。

Claims (13)

  1. 一种背光模组,其中,所述背光模组包括:
    导光板,包括至少一个入光面以及分别与所述至少一个入光面连接且相对设置的出光面和反射面;
    光源,邻近于所述入光面设置,所述光源包括蓝光LED和红光量子点、绿光量子点,所述蓝光LED发出的光、所述红光量子点发出的光以及绿光量子点发出的光混合形成白光;
    扩散片,邻近于所述导光板的出光面设置;
    金属栅线偏光膜,设置于所述导光板的出光面一侧,且所述扩散片设置于所述导光板和所述金属线栅偏光膜之间;
    四分之一波片,邻近于所述导光板的反射面设置,其中所述四分之一波片的快轴与所述金属栅线偏光膜的金属栅线的方向的夹角为45°;
    反射片,设置于所述四分之一波片背向所述导光板的一侧。
  2. 根据权利要求1所述的背光模组,其中,所述红光量子点和所述绿光量子点分散于第一量子点膜和第二量子点膜中,所述第一量子点膜和所述第二量子点膜设置于所述蓝光LED和所述导光板的入光面之间或者设置于所述导光板的出光面上。
  3. 根据权利要求1所述的背光模组,其中,所述红光量子点和所述绿光量子点分散于同一量子点膜中,所述量子点膜设置于所述蓝光LED和所述导光板的入光面之间或者设置于所述导光板的出光面上。
  4. 一种背光模组,其中,所述背光模组包括:
    导光板,包括至少一个入光面以及分别与所述至少一个入光面连接且相对设置的出光面和反射面;
    光源,邻近于所述入光面设置;
    金属栅线偏光膜,设置于所述导光板的出光面一侧;
    四分之一波片,邻近于所述导光板的反射面设置,其中所述四分之一波片的快轴与所述金属栅线偏光膜的金属栅线的方向的夹角为45°;
    反射片,设置于所述四分之一波片背向所述导光板的一侧。
  5. 根据权利要求4所述的背光模组,其中,所述光源包括蓝光LED和红光量子点、绿光量子点,所述蓝光LED发出的光、所述红光量子点发出的光以及绿光量子点发出的光混合形成白光。
  6. 根据权利要求5所述的背光模组,其中,所述红光量子点和所述绿光量子点分散于第一量子点膜和第二量子点膜中,所述第一量子点膜和所述第二量子点膜设置于所述蓝光LED和所述导光板的入光面之间或者设置于所述导光板的出光面上。
  7. 根据权利要求5所述的背光模组,其中,所述红光量子点和所述绿光量子点分散于同一量子点膜中,所述量子点膜设置于所述蓝光LED和所述导光板的入光面之间或者设置于所述导光板的出光面上。
  8. 根据权利要求4所述的背光模组,其中,所述背光模组还包括设置于所述导光板和所述金属线栅偏光膜之间的扩散片。
  9. 一种液晶显示装置,其中,所述液晶显示装置包括液晶面板以及为所述液晶面板提供光的背光模组,所述背光模组包括:
    导光板,包括至少一个入光面以及分别与所述至少一个入光面连接且相对设置的出光面和反射面;
    光源,邻近于所述入光面设置;
    金属栅线偏光膜,设置于所述导光板的出光面一侧;
    四分之一波片,邻近于所述导光板的反射面设置,其中所述四分之一波片的快轴与所述金属栅线偏光膜的金属栅线的方向的夹角为45°;
    反射片,设置于所述四分之一波片背向所述导光板的一侧。
  10. 根据权利要求9所述的液晶显示装置,其中,所述液晶面板包括第一基板和第二基板以及夹设于所述第一基板和所述第二基板之间的液晶层,所述金属线栅偏光膜设置于所述第一基板和所述第二基板之间,且邻近于所述液晶层朝向所述导光板的一侧设置。
  11. 根据权利要求9所述的液晶显示装置,其中,所述液晶面板包括第一基板和第二基板以及夹设于所述第一基板和所述第二基板之间的液晶层,所述第二基板邻近于所述导光板的出光面设置,所述金属线栅偏光膜设置于所述第一基板和所述导光板的出光面之间。
  12. 根据权利要求9所述的液晶显示装置,其中,所述液晶面板还包括设置于所述第一基板背向所述液晶层一侧的偏光片,所述偏光片的透光轴的方向与所述金属线栅偏光膜的金属线栅的方向相垂直。
  13. 根据权利要求9所述的液晶显示装置,其中,所述背光模组还包括设置于所述导光板和所述金属线栅偏光膜之间的扩散片。
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