WO2017177488A1 - 双面液晶显示装置及其背光模组 - Google Patents

双面液晶显示装置及其背光模组 Download PDF

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Publication number
WO2017177488A1
WO2017177488A1 PCT/CN2016/081507 CN2016081507W WO2017177488A1 WO 2017177488 A1 WO2017177488 A1 WO 2017177488A1 CN 2016081507 W CN2016081507 W CN 2016081507W WO 2017177488 A1 WO2017177488 A1 WO 2017177488A1
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WIPO (PCT)
Prior art keywords
light
liquid crystal
quantum dot
metal wire
wire grid
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2016/081507
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English (en)
French (fr)
Inventor
李明辉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
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Filing date
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US15/107,449 priority Critical patent/US10203439B2/en
Publication of WO2017177488A1 publication Critical patent/WO2017177488A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133536—Reflective polarizers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
    • G02B5/3058—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state comprising electrically conductive elements, e.g. wire grids, conductive particles
    • 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
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • 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
    • G02F1/133528—Polarisers
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    • 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
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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
    • G02F1/133621—Illuminating devices providing coloured light
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • 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
    • G02F1/133342—Constructional arrangements; Manufacturing methods for double-sided displays
    • 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
    • G02F1/133528—Polarisers
    • G02F1/133548—Wire-grid polarisers
    • 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
    • G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
    • G02F1/133567—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the back side
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • 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
    • 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
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    • 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
    • G02F2201/00—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00
    • G02F2201/30—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 grating

Definitions

  • Embodiments of the present invention relate to liquid crystal display (Liquid crystal display,
  • the invention relates to the field of LCD technology, in particular to a double-sided liquid crystal display device and a backlight module thereof.
  • the two liquid crystal panels disposed opposite each other share a set of backlight modules.
  • the backlight module is divided into a side-in type and a direct-down type. Type, in which the side-in type backlight module is widely used because of its thin thickness.
  • the light provided by the backlight passes through the light guide plate to form a surface light and passes through the polarizer to become a polarized light required for the liquid crystal panel.
  • the polarizers are respectively attached to the upper and lower sides of the liquid crystal panel, which not only increases the adhesion caused by the attachment. Cost, and the polarizer is made of PVA (Polyvinyl Alcohol, polyvinyl alcohol) layer, TAC (Tri-cellulose Acetate) layer and PET (Polyethylene) Terephthalate, The composition of the polyethylene terephthalate film and the like is complicated, and the light utilization efficiency of the polarizer is unreliable.
  • the amount of light of the light-reflecting surface and the light-emitting surface of the light guide plate is different, so that the display brightness of the liquid crystal panel on the light-emitting surface side is higher, and the display brightness of the liquid crystal panel on the light-reflecting surface side is darker, that is, the same backlight.
  • the display brightness of the two liquid crystal panels is different, and the light utilization efficiency is poor.
  • the present invention provides a double-sided liquid crystal display device and a backlight module thereof for improving light utilization efficiency, improving display brightness of two liquid crystal panels, and uniformizing display brightness of both.
  • a double-sided liquid crystal display device includes: a light guide plate, comprising: at least one light incident surface; and a first light emitting surface and a second light emitting surface respectively connected to the at least one light incident surface; Adjacent to the light entrance surface, the light source comprises a blue LED and a red quantum dot, a green quantum dot, a light emitted by the blue LED, a light emitted by the red quantum dot, and a light emitted by the green quantum dot to form a white light; the first liquid crystal panel is adjacent to The first light-emitting surface is disposed, the first metal wire grid polarizing film of the first liquid crystal panel is adjacent to the first light-emitting surface; the second liquid crystal panel is disposed adjacent to the second light-emitting surface, and the second metal wire grid polarizing film of the second liquid crystal panel is adjacent to a second light-emitting surface; a first diffusion sheet disposed between the light guide plate and the first metal wire grid polarizing film,
  • the red light quantum dot and the green light quantum dot are dispersed in the first quantum dot film and the second quantum dot film, and the first quantum dot film and the second quantum dot film are disposed between the blue LED and the light incident surface of the light guide plate or are disposed The first light emitting surface and the second light emitting surface of the light guide plate.
  • 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 first light emitting surface and the second light emitting surface of the light guide plate.
  • the first liquid crystal panel and the second liquid crystal panel each include a first substrate and a second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate, the first metal wire grid polarizing film and the second metal wire grid At least one of the polarizing films is disposed between the first substrate and the second substrate and disposed adjacent to a side of the liquid crystal layer facing the light guide plate.
  • a double-sided liquid crystal display device includes: a light guide plate, comprising: at least one light incident surface; and a first light emitting surface and a second light emitting surface respectively connected to the at least one light incident surface; Provided adjacent to the light incident surface; the first liquid crystal panel is disposed adjacent to the first light emitting surface, the first metal wire grid polarizing film of the first liquid crystal panel is adjacent to the first light emitting surface; and the second liquid crystal panel is disposed adjacent to the second light emitting surface a second metal wire grid polarizing film of the second liquid crystal panel is adjacent to the second light emitting surface; wherein a direction of the metal wire grid of the first metal wire grid polarizing film is perpendicular to a direction of the metal wire grid of the second metal wire grid polarizing film .
  • the light source comprises a blue LED and a red quantum dot, a green quantum dot, a light emitted by the blue LED, a light emitted by the red quantum dot, and a light emitted by the green quantum dot to form a white light.
  • the red light quantum dot and the green light quantum dot are dispersed in the first quantum dot film and the second quantum dot film, and the first quantum dot film and the second quantum dot film are disposed between the blue LED and the light incident surface of the light guide plate or are disposed The first light emitting surface and the second light emitting surface of the light guide plate.
  • 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 first light emitting surface and the second light emitting surface of the light guide plate.
  • the first liquid crystal panel and the second liquid crystal panel each include a first substrate and a second substrate, and a liquid crystal layer interposed between the first substrate and the second substrate, the first metal wire grid polarizing film and the second metal wire grid At least one of the polarizing films is disposed between the first substrate and the second substrate and disposed adjacent to a side of the liquid crystal layer facing the light guide plate.
  • the double-sided liquid crystal display device further includes a first diffusion sheet disposed between the light guide plate and the first metal wire grid polarizing film, and a second diffusion sheet disposed on the light guide plate and the second metal Between the wire grid polarizing films.
  • An embodiment of the present invention provides a backlight module for a double-sided liquid crystal display device, including: a light guide plate, including at least one light incident surface, and a first light emitting surface and a second oppositely connected to the at least one light incident surface a light emitting surface disposed adjacent to the light incident surface; a first metal wire grid polarizing film disposed adjacent to the first light emitting surface; and a second metal wire grid polarizing film disposed adjacent to the second light emitting surface.
  • the light source comprises a blue LED and a red quantum dot, a green quantum dot, a light emitted by the blue LED, a light emitted by the red quantum dot, and a light emitted by the green quantum dot to form a white light.
  • the red light quantum dot and the green light quantum dot are dispersed in one or two quantum dot films, and the quantum dot film is disposed between the blue LED and the light incident surface of the light guide plate or disposed on the first light emitting surface and the second light output of the light guide plate On the surface.
  • the backlight module further includes a first diffusion sheet disposed between the light guide plate and the first metal wire grid polarizing film, and a second diffusion sheet disposed on the light guide plate and the second metal wire grid Between polarizing films.
  • the two metal wire grid polarizing films disposed vertically in the direction of the metal wire grid can use the reflected light of one liquid crystal panel to provide incident light to the other liquid crystal panel.
  • the incident light and the reflected light of the two liquid crystal panels of the double-sided display device compensate each other, so that the light emitted by the light source can be fully utilized, the light utilization efficiency is greatly improved, and the display brightness of the two liquid crystal panels is improved while the display of the two liquid crystal panels is improved. Brightness is uniform.
  • FIG. 1 is a cross-sectional view showing the structure of an embodiment of a double-sided liquid crystal display device of the present invention
  • Fig. 2 is a schematic view showing the structure of an embodiment of a metal wire grid polarizing film of the present invention.
  • Fig. 1 is a cross-sectional view showing the structure of an embodiment of a double-sided liquid crystal display device of the present invention.
  • the double-sided liquid crystal display device of the embodiment includes a light guide plate 10 , a light source 20 , a first liquid crystal panel 30 , and a second liquid crystal panel 40 .
  • the light guide plate 10 includes a light incident surface 11 and a first light exit surface 12 and a second light exit surface 13 which are respectively connected to the light incident surface 11 and disposed opposite to each other.
  • the first light-emitting surface 12 is the light guide plate 10
  • the upper surface, the second light-emitting surface 13 is the light guide plate 10
  • the lower surface, the light incident surface 11 is a side surface connecting the upper surface and the lower surface.
  • the light guide plate 10 may further include two light incident surfaces 11, that is, the other light incident surface is a side surface opposite to the light incident surface 11 shown in FIG.
  • a light source 20 is disposed adjacent to the light incident surface 11.
  • the light source 20 of the present embodiment includes a blue LED. 21 and at least one quantum dot film 22, wherein the at least one quantum dot film 22 is dispersed with red light quantum dots and green light quantum dots, wherein the red light quantum dots and the green light quantum dots may be dispersed in the same quantum dot film 22, or may be distributed in two In the quantum dot film 22, the red light quantum dots are dispersed in the first quantum dot film and the green light quantum dots are dispersed in the second quantum dot film.
  • a blue LED The blue light emitted by 21 passes through the quantum dot film 22 and the light guide plate 10.
  • the red light quantum dots and the green light quantum dots dispersed in the quantum dot film 22 absorb a part of blue light, and then the red light quantum dots emit red light, and the green light quantum dots emit green light, and the rest
  • the blue and red light quantum dots emit red light and the green light quantum dots emit green light to form white light.
  • the red light quantum dots dispersed in the quantum dot film 22 have completely discrete electronic energy levels
  • the green light quantum dots also have completely discrete electronic energy levels
  • the valence bands and conduction bands of the red and green light quantum dots when illuminated by light The electrons on the upper and lower transitions to emit light.
  • the blue LED 21 and the quantum dot film 22 are two independent parts, and the red light quantum dot emits red light as a very pure red monochromatic light, and the green light quantum dot emits green light as a very pure green monochromatic light, so that a very high The color gamut, and the red and green light emitted by the quantum dot film 22 is not affected by the blue LED. 21
  • the effect of heat generated during the work process can avoid the problem of easy color change.
  • the quantum dot film 22 is only required to be disposed on the blue LED.
  • White light can be formed on the optical path of 21, in particular, the quantum dot film 22 (including the first quantum dot film and the second quantum dot film) can be disposed on the blue LED 21 is disposed between the light incident surface 11 of the light guide plate 10 or on the first light emitting surface 12 and the second light emitting surface 13 of the light guide plate 11.
  • the first liquid crystal panel 30 is disposed adjacent to the first light emitting surface 12 of the light guide plate 10
  • the second liquid crystal panel 40 is adjacent to the light guide plate 10 .
  • the second light exit surface 13 is set.
  • the first liquid crystal panel 30 and the second liquid crystal panel 40 may have the same structure.
  • the first liquid crystal panel 30 is exemplified, and includes a first substrate 31 and a second substrate 32 which are relatively spaced, wherein the first substrate 31 and the second substrate 32 are included.
  • a color film substrate Color Filter Substrate, referred to as a CF substrate, also referred to as a color filter substrate
  • the other of the first substrate 31 and the second substrate 32 is an array substrate (Thin Film) Transistor Substrate, referred to as TFT substrate, Also referred to as a thin film transistor substrate or an Array substrate
  • TFT substrate Thin Film Transistor Substrate
  • the liquid crystal layer 33 includes liquid crystal molecules and is located in a liquid crystal cell formed by stacking the array substrate and the color filter substrate.
  • the first liquid crystal panel 30 of the present embodiment further includes a first metal wire grid polarizing film 34, that is, the first metal wire grid polarizing film 34 is disposed on the array substrate and the color film of the first liquid crystal panel 30. Between the substrates, the first metal wire grid polarizing film 34 is disposed on the light guide plate 10 The first light-emitting surface 12 and the liquid crystal layer 33 are disposed adjacent to the side of the liquid crystal layer 33 facing the light guide plate 10, as shown in FIG. 1, that is, the first metal wire grid polarizing film 34 is disposed as shown in FIG. The upper surface of the second substrate 32.
  • the second liquid crystal panel 40 includes a second metal wire grid polarizing film 44, and the second metal wire grid polarizing film 44 is disposed between the first substrate 41 and the second substrate 42 of the second liquid crystal panel 40.
  • the metal wire grid polarizing film 44 is disposed on the light guide plate 10
  • the second light-emitting surface 13 and the liquid crystal layer 43 are disposed adjacent to the side of the liquid crystal layer 43 facing the light guide plate 10, as shown in FIG. 1, that is, the second metal wire grid polarizing film 44 is disposed as shown in FIG.
  • the inner surface of the second substrate 42 is disposed as shown in FIG.
  • the metal wire grid of the first metal wire grid polarizing film 34 can be directly formed on the glass substrate of the second substrate 32 of the first liquid crystal panel 30, that is, the first metal wire grid polarizing film 34 and the first liquid crystal panel 30 share the glass. Substrate.
  • the metal wire grid of the second metal wire grid polarizing film 44 can be directly formed on the glass substrate of the second substrate 42 of the second liquid crystal panel 40, that is, the second metal wire grid polarizing film 44 and the second liquid crystal panel 40 are shared. glass substrate.
  • the direction of the metal wire grid of the first metal wire grid polarizing film 34 is perpendicular to the direction of the metal wire grid of the second metal wire grid polarizing film 44.
  • light perpendicular to the direction of the metal wire grid L can be transmitted through the metal wire grid polarizing film, and light parallel to the direction of the metal wire grid L is reflection.
  • Ia is incident light
  • Ib and Ic are vertical and parallel components of Ia, so Ib is transmitted through the metal wire grid as polarized light Tb, and incident light Ic can only be reflected as reflected light Rc.
  • the white light formed by the light source 20 is incident on the light guide plate 10 through the light incident surface 11 , and the light guide plate 10 converts the light source 20 into a surface light source, and the light emitted from the first light exit surface 12 enters the first liquid crystal panel 30 .
  • the incident light I1 the light emitted from the second light-emitting surface 13 is the incident light I2 entering the second liquid crystal panel 40.
  • the incident light I1 enters the first metal wire grid polarizing film 34
  • the light perpendicular to the direction of the metal wire grid becomes the polarized light T1 and passes through the first liquid crystal panel 30, and is parallel to the metal wire grid.
  • the light in the direction is reflected as the reflected light R1.
  • the reflected light R1 passes through the light guide plate 10 of the second liquid crystal panel 40 to re-form the surface light, and then the light perpendicular to the direction of the metal wire grid of the second metal wire grid polarizing film 44 becomes polarized light and transmits through the second liquid crystal panel 40.
  • the light parallel to the direction of the metal wire grid of the second metal wire grid polarizing film 44 is reflected and passes through the light guide plate 10 again to become incident light of the first liquid crystal panel 30.
  • the incident light I2 enters the second metal wire grid polarizing film 44
  • the light perpendicular to the direction of the metal wire grid becomes the polarized light T2 and passes through the second liquid crystal panel 40, and is parallel to Light in the direction of the wire grid is reflected as reflected light R2.
  • the reflected light R2 passes through the light guide plate 10 of the first liquid crystal panel 30, the surface light is newly formed, and then the light perpendicular to the metal wire grid direction of the first metal wire grid polarizing film 34 becomes polarized light and transmits through the first liquid crystal panel 30.
  • the light in the direction of the metal wire grid parallel to the first metal wire grid polarizing film 34 is reflected, and passes through the light guide plate 10 again to become the incident light of the second liquid crystal panel 40.
  • the white light emitted from the light source 20 can be fully utilized by the double-sided display device, and the incident light and the reflected light of the two liquid crystal panels 30 and 40 of the double-sided display device compensate each other, so that the light emitted from the light source 20 can be fully utilized.
  • the light utilization efficiency is greatly improved, and the display brightness of the two liquid crystal panels 30 and 40 is increased while the display brightness of both is uniform.
  • the double-sided liquid crystal display device of the embodiment of the present invention may further include a first diffusion sheet disposed between the light guide plate 10 and the first metal wire grid polarizing film 34, and a second diffusion sheet disposed on the second diffusion sheet Between the light guide plate 10 and the second metal wire grid polarizing film 44.
  • the first diffusion sheet may be attached to an outer surface of the second substrate 32 of the first liquid crystal panel 30 for further scattering light emitted from the light guide plate 10, so that the light is more uniformly directed to the first liquid crystal panel.
  • the second diffusion sheet may be attached to the outer surface of the second substrate 42 of the second liquid crystal panel 40 for further scattering the light emitted from the light guide plate 10 so that the light is more uniformly directed toward the second liquid crystal panel 40.
  • the backlight module shared by the first liquid crystal panel 30 and the second liquid crystal panel 40 includes a light guide plate 10 and a light source 20, and preferably further includes a first diffusion sheet and a second diffusion sheet.
  • the present invention further provides a backlight module of an embodiment.
  • the backlight module of the present embodiment includes not only the light guide plate 10 and the light source 20, but also preferably a first diffusion sheet and a second diffusion sheet, and includes a first metal.
  • a wire grid polarizing film 34 and a second metal wire grid polarizing film 44 wherein the first metal wire grid polarizing film 34 is disposed adjacent to the first light emitting surface 12 of the light guiding plate 10, and the second metal wire grid polarizing film 44 is adjacent to the light guiding plate 10.
  • the second light exit surface 13 is set. That is, in the present invention, the first metal wire grid polarizing film 34 and the second metal wire grid polarizing film 44 shown in FIG. 1 can be disposed on both sides of the light guide plate 10 by external attachment.
  • the two metal wire grid polarizing films disposed vertically in the direction of the metal wire grid are used to reflect the light of one liquid crystal panel as the incident light of the other liquid crystal panel, and the incident light of the two liquid crystal panels. Compensating with the reflected light, greatly improving the light utilization efficiency, improving the display brightness of the two liquid crystal panels, and simultaneously making the display brightness of the two liquid crystals uniform; in addition, the metal wire grid polarizing film has a built-in polarizing plate attached to the outside of the substrate. It can reduce process and cost and ensure polarized features; white light backlight can be formed by blue LED and red and green quantum dots, which can improve the color gamut and brightness of the double-sided display device.

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Abstract

一种双面液晶显示装置及其背光模组，利用金属线栅的方向垂直设置的两个金属线栅偏光膜(34,44)将一侧液晶面板的反射光作为另一侧液晶面板的入射光，两个液晶面板的入射光和反射光相互补偿，大大地提高了光利用率，提高两液晶面板的显示亮度的同时使得两者的显示亮度均一化；另外，金属线栅偏光膜内置取代贴附在基板外侧的偏光板，能够减少制程和成本并确保偏光特征；通过蓝色LED(21)和红、绿量子点形成白光背光源，可以提高双面显示装置的色域和亮度。

Description

双面液晶显示装置及其背光模组
【技术领域】
本发明实施例涉及液晶显示（Liquid crystal display, LCD）技术领域，具体涉及一种双面液晶显示装置及其背光模组。
【背景技术】
当前为了满足双方面对面确认屏幕显示的需求，双面液晶显示装置应用于银行、超市等交易场所已成为一种趋势。在双面液晶显示装置的结构设计中，两个背对设置的液晶面板共用一组背光模组，根据背光源和导光板的位置关系，该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。
背光源提供的光经过导光板后形成面光并经过偏光片后成为液晶面板所需的偏振光，其中偏光片分别贴附于液晶面板的上下两侧，这不仅增加了贴附所带来的成本，而且偏光片由PVA(Polyvinyl alcohol, 聚乙烯醇)层、TAC(Tri-cellulose Acetate, 三醋酸纤维素)层以及PET(Polyethylene terephthalate, 聚对苯二甲酸乙二醇酯)膜等组成，结构复杂，导致偏光片的光利用率不可靠。另外，导光板的反光面和出光面的光量不同，使得位于出光面一侧的液晶面板的显示亮度较高，而位于反光面一侧的液晶面板的显示亮度较暗，即同一背光源对应的两个液晶面板的显示亮度不同，光利用效率较差。
【发明内容】
鉴于此，本发明提供一种双面液晶显示装置及其背光模组，以提高光利用率，提高两液晶面板的显示亮度并使两者的显示亮度均一化。
本发明实施例提供的一种双面液晶显示装置，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第一出光面和第二出光面；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；第一液晶面板，邻近于第一出光面设置，第一液晶面板的第一金属线栅偏光膜邻近第一出光面；第二液晶面板，邻近于第二出光面设置，第二液晶面板的第二金属线栅偏光膜邻近第二出光面；第一扩散片和第二扩散片，第一扩散片设置于导光板和第一金属线栅偏光膜之间，第二扩散片设置于导光板和第二金属线栅偏光膜之间；其中，第一金属线栅偏光膜的金属线栅的方向与第二金属线栅偏光膜的金属线栅的方向相垂直。
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第一出光面和第二出光面上。
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第一出光面和第二出光面上。
其中，第一液晶面板和第二液晶面板均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，第一金属线栅偏光膜和第二金属线栅偏光膜的至少一个设置于第一基板和第二基板之间，且邻近于液晶层朝向导光板的一侧设置。
本发明实施例提供的一种双面液晶显示装置，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第一出光面和第二出光面；光源，邻近于入光面设置；第一液晶面板，邻近于第一出光面设置，第一液晶面板的第一金属线栅偏光膜邻近第一出光面；第二液晶面板，邻近于第二出光面设置，第二液晶面板的第二金属线栅偏光膜邻近第二出光面；其中，第一金属线栅偏光膜的金属线栅的方向与第二金属线栅偏光膜的金属线栅的方向相垂直。
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第一出光面和第二出光面上。
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第一出光面和第二出光面上。
其中，第一液晶面板和第二液晶面板均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，第一金属线栅偏光膜和第二金属线栅偏光膜的至少一个设置于第一基板和第二基板之间，且邻近于液晶层朝向导光板的一侧设置。
其中，双面液晶显示装置还包括第一扩散片和第二扩散片，第一扩散片设置于导光板和第一金属线栅偏光膜之间，第二扩散片设置于导光板和第二金属线栅偏光膜之间。
本发明实施例提供一种用于双面液晶显示装置的背光模组，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第一出光面和第二出光面；光源，邻近于入光面设置；第一金属线栅偏光膜，邻近于第一出光面设置；第二金属线栅偏光膜，邻近于第二出光面设置。
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一个或两个量子点膜中，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第一出光面和第二出光面上。
其中，背光模组还包括第一扩散片和第二扩散片，第一扩散片设置于导光板和第一金属线栅偏光膜之间，第二扩散片设置于导光板和第二金属线栅偏光膜之间。
本发明实施例的双面液晶显示装置及其背光模组，金属线栅的方向垂直设置的两个金属线栅偏光膜能够利用一侧液晶面板的反射光为另一侧液晶面板提供入射光，双面显示装置的两个液晶面板的入射光和反射光相互补偿，使得光源发出的光能够被充分利用，大大地提高了光利用率，提高两液晶面板的显示亮度的同时使得两者的显示亮度均一化。
【附图说明】
图1是本发明的双面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是本发明的双面液晶显示装置一实施例的结构剖视图。请参阅图1所示，本实施例的双面液晶显示装置包括导光板10、光源20、第一液晶面板30以及第二液晶面板40。
导光板10包括一个入光面11以及分别与入光面11连接且相对设置的第一出光面12和第二出光面13。其中，第一出光面12为导光板10 的上表面，第二出光面13为导光板10 的下表面，入光面11为连接上表面和下表面的侧表面。应该理解到，导光板10还可以包括两个入光面11，即另一个入光面是与图1所示的入光面11相对的侧表面。
邻近于入光面11设置一光源20，优选地，本实施例的光源20包括蓝光LED 21和至少一个量子点膜22，该至少一个量子点膜22分散有红光量子点和绿光量子点，其中红光量子点和绿光量子点可以分散于同一张量子点膜22中，也可以分布于两张量子点膜22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22为例，蓝光LED 21发出的蓝光经过量子点膜22和导光板10，量子点膜22中分散的红光量子点和绿光量子点吸收一部分蓝光，然后该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22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20的结构设计中，蓝光LED 21和量子点膜22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，因此可以实现很高的色域，并且量子点膜22发出的红光、绿光也不会受到蓝光LED 21工作过程中产生的热量的影响，可以避免容易发生色变的问题。
在本实施例中，量子点膜22只要设置于蓝光LED 21的光路上即可形成白光，具体地，量子点膜22（包括第一量子点膜和第二量子点膜）可以设置于蓝光LED 21和导光板10的入光面11之间，或者设置于导光板11的第一出光面12和第二出光面13上。
第一液晶面板30邻近于导光板10 的第一出光面12设置，第二液晶面板40邻近于导光板10 的第二出光面13设置。第一液晶面板30和第二液晶面板40的结构可以相同，以第一液晶面板30为例，其包括相对间隔的第一基板31和第二基板32，其中第一基板31和第二基板32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31和第二基板32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33，该液晶层33包括液晶分子并位于阵列基板和彩膜基板叠加形成的液晶盒内。
在上述结构基础上，本实施例的第一液晶面板30还包括内置的第一金属线栅偏光膜34，即第一金属线栅偏光膜34设置于第一液晶面板30的阵列基板和彩膜基板之间，第一金属线栅偏光膜34设置于导光板10 的第一出光面12和液晶层33之间，具体邻近于液晶层33朝向导光板10的一侧设置，反映在图1所示，即第一金属线栅偏光膜34设置于图1所示的第二基板32的上表面。同理，第二液晶面板40包括内置的第二金属线栅偏光膜44，第二金属线栅偏光膜44设置于第二液晶面板40的第一基板41和第二基板42之间，第二金属线栅偏光膜44设置于导光板10 的第二出光面13和液晶层43之间，具体邻近于液晶层43朝向导光板10的一侧设置，反映在图1所示，即第二金属线栅偏光膜44设置于图1所示的第二基板42的内表面。
其中，第一金属线栅偏光膜34的金属线栅可直接形成于第一液晶面板30的第二基板32的玻璃基板上，即第一金属线栅偏光膜34和第一液晶面板30共用玻璃基板。同理，第二金属线栅偏光膜44的金属线栅可直接形成于第二液晶面板40的第二基板42的玻璃基板上，即第二金属线栅偏光膜44和第二液晶面板40共用玻璃基板。
在本发明实施例中，第一金属线栅偏光膜34的金属线栅的方向与第二金属线栅偏光膜44的金属线栅的方向相垂直。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。
进一步结合图1所示，光源20形成的白光经入光面11入射到导光板10，导光板10将光源20转换为面光源，从第一出光面12出射的光为进入第一液晶面板30的入射光I1，从第二出光面13出射的光为进入第二液晶面板40的入射光I2。
在第一液晶面板30中，入射光I1进入第一金属线栅偏光膜34时，垂直于金属线栅的方向的光成为偏振光T1并透过第一液晶面板30，而平行于金属线栅方向的光被反射成为反射光R1。反射光R1经过第二液晶面板40的导光板10后重新形成面性光，之后垂直于第二金属线栅偏光膜44的金属线栅的方向的光成为偏振光并透过第二液晶面板40，而平行于第二金属线栅偏光膜44的金属线栅的方向的光被反射，并再次经过导光板10后成为第一液晶面板30的入射光。
同理，在第二液晶面板40中，入射光I2进入第二金属线栅偏光膜44时，垂直于金属线栅的方向的光成为偏振光T2并透过第二液晶面板40，而平行于金属线栅方向的光被反射成为反射光R2。反射光R2经过第一液晶面板30的导光板10后重新形成面性光，之后垂直于第一金属线栅偏光膜34的金属线栅方向的光成为偏振光并透过第一液晶面板30，而平行于第一金属线栅偏光膜34的金属线栅方向的光被反射，并再次经过导光板10后成为第二液晶面板40的入射光。
如此循环反复，光源20发出的白光能够被双面显示装置充分利用，双面显示装置的两个液晶面板30、40的入射光和反射光相互补偿，使得光源20发出的光能够被充分利用，大大地提高了光利用率，提高两液晶面板30、40的显示亮度的同时使得两者的显示亮度均一化。
本发明实施例的双面液晶显示装置还可包括第一扩散片和第二扩散片，第一扩散片设置于导光板10和第一金属线栅偏光膜34之间，第二扩散片设置于导光板10和第二金属线栅偏光膜44之间。具体地，该第一扩散片可贴附于第一液晶面板30的第二基板32的外表面，用于将从导光板10出射的光进一步散射，使得光更加均匀地射向第一液晶面板30；第二扩散片可以贴附于第二液晶面板40的第二基板42的外表面，用于将从导光板10出射的光进一步散射，使得光更加均匀地射向第二液晶面板40。
在图1所示实施例中，第一液晶面板30和第二液晶面板40共用的背光模组包括导光板10和光源20，优选地还包括第一扩散片和第二扩散片。本发明还提供一种实施例的背光模组，本实施例的背光模组不仅包括上述导光板10和光源20，当然优选地还包括第一扩散片和第二扩散片，而且包括第一金属线栅偏光膜34和第二金属线栅偏光膜44，其中第一金属线栅偏光膜34邻近于导光板10的第一出光面12设置、第二金属线栅偏光膜44邻近于导光板10的第二出光面13设置。也就是说，本发明还可以将图1所示的第一金属线栅偏光膜34和第二金属线栅偏光膜44采用外贴附方式设置于导光板10的两侧。
综上所述，本发明实施例利用金属线栅的方向垂直设置的两个金属线栅偏光膜将一侧液晶面板的反射光作为另一侧液晶面板的入射光，两个液晶面板的入射光和反射光相互补偿，大大地提高了光利用率，提高两液晶面板的显示亮度的同时使得两者的显示亮度均一化；另外，金属线栅偏光膜内置取代贴附在基板外侧的偏光板，能够减少制程和成本并确保偏光特征；通过蓝色LED和红、绿量子点形成白光背光源，可以提高双面显示装置的色域和亮度。
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 (14)

  1. 一种双面液晶显示装置，其中，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第一出光面和第二出光面；
    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；
    第一液晶面板，邻近于所述第一出光面设置，所述第一液晶面板的第一金属线栅偏光膜邻近所述第一出光面；
    第二液晶面板，邻近于所述第二出光面设置，所述第二液晶面板的第二金属线栅偏光膜邻近所述第二出光面；
    第一扩散片和第二扩散片，所述第一扩散片设置于所述导光板和所述第一金属线栅偏光膜之间，所述第二扩散片设置于所述导光板和所述第二金属线栅偏光膜之间；
    其中，所述第一金属线栅偏光膜的金属线栅的方向与所述第二金属线栅偏光膜的金属线栅的方向相垂直。
  2. 根据权利要求1所述的双面液晶显示装置，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第一出光面和第二出光面上。
  3. 根据权利要求1所述的双面液晶显示装置，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第一出光面和第二出光面上。
  4. 根据权利要求1所述的双面液晶显示装置，其中，所述第一液晶面板和所述第二液晶面板均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，所述第一金属线栅偏光膜和所述第二金属线栅偏光膜的至少一个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。
  5. 一种双面液晶显示装置，其中，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第一出光面和第二出光面；
    光源，邻近于所述入光面设置；
    第一液晶面板，邻近于所述第一出光面设置，所述第一液晶面板的第一金属线栅偏光膜邻近所述第一出光面；
    第二液晶面板，邻近于所述第二出光面设置，所述第二液晶面板的第二金属线栅偏光膜邻近所述第二出光面；
    其中，所述第一金属线栅偏光膜的金属线栅的方向与所述第二金属线栅偏光膜的金属线栅的方向相垂直。
  6. 根据权利要求5所述的双面液晶显示装置，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。
  7. 根据权利要求6所述的双面液晶显示装置，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第一出光面和第二出光面上。
  8. 根据权利要求6所述的双面液晶显示装置，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第一出光面和第二出光面上。
  9. 根据权利要求5所述的双面液晶显示装置，其中，所述第一液晶面板和所述第二液晶面板均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，所述第一金属线栅偏光膜和所述第二金属线栅偏光膜的至少一个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。
  10. 根据权利要求5所述的双面液晶显示装置，其中，所述双面液晶显示装置还包括第一扩散片和第二扩散片，所述第一扩散片设置于所述导光板和所述第一金属线栅偏光膜之间，所述第二扩散片设置于所述导光板和所述第二金属线栅偏光膜之间。
  11. 一种用于双面液晶显示装置的背光模组，其中，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第一出光面和第二出光面；
    光源，邻近于所述入光面设置；
    第一金属线栅偏光膜，邻近于所述第一出光面设置；
    第二金属线栅偏光膜，邻近于所述第二出光面设置。
  12. 根据权利要求11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。
  13. 根据权利要求12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一个或两个量子点膜中，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第一出光面和第二出光面上。
  14. 根据权利要求11所述的背光模组，其中，所述背光模组还包括第一扩散片和第二扩散片，所述第一扩散片设置于所述导光板和所述第一金属线栅偏光膜之间，所述第二扩散片设置于所述导光板和所述第二金属线栅偏光膜之间。
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