WO2010147355A3 - Reflective plate for backlight unit, backlight unit comprising the same and liquid crystal display - Google Patents

Reflective plate for backlight unit, backlight unit comprising the same and liquid crystal display Download PDF

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Publication number
WO2010147355A3
WO2010147355A3 PCT/KR2010/003826 KR2010003826W WO2010147355A3 WO 2010147355 A3 WO2010147355 A3 WO 2010147355A3 KR 2010003826 W KR2010003826 W KR 2010003826W WO 2010147355 A3 WO2010147355 A3 WO 2010147355A3
Authority
WO
WIPO (PCT)
Prior art keywords
backlight unit
liquid crystal
cholesteric liquid
reflective
specific area
Prior art date
Application number
PCT/KR2010/003826
Other languages
French (fr)
Korean (ko)
Other versions
WO2010147355A2 (en
Inventor
조기호
심용식
장혜진
Original Assignee
주식회사 엘엠에스
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
Publication date
Application filed by 주식회사 엘엠에스 filed Critical 주식회사 엘엠에스
Publication of WO2010147355A2 publication Critical patent/WO2010147355A2/en
Publication of WO2010147355A3 publication Critical patent/WO2010147355A3/en

Links

Classifications

    • 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
    • G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
    • G02B5/3041—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid comprising multiple thin layers, e.g. multilayer stacks
    • 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
    • G02B6/0056—Means 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • 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
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector
    • G02F2201/343—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector cholesteric liquid crystal reflector

Abstract

The present invention relates to a reflective plate for a backlight unit. The reflective plate for a backlight unit is arranged in the backlight unit to reflect incident light, and comprises: a reflective layer for reflecting incident random polarized light; a first cholesteric liquid crystal layer formed at one side of the reflective layer to reflect first polarized light in a specific area and transmit second polarized light in the specific area therethrough; and a second cholesteric liquid crystal layer arranged to reflect the second polarized light in the specific area, transmitted through the first cholesteric liquid crystal layer, wherein the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer have reflective wavelength bands for reflecting light in a specific area having a low reflectivity, from among an arbitrary reflection area to be reflected by the reflective layer. Consequently, the present invention improves reflectivity of the specific area having a low reflectivity, from among the visible light area for reflecting incident light through a reflective plate, thereby compensating a color difference.
PCT/KR2010/003826 2009-06-17 2010-06-15 Reflective plate for backlight unit, backlight unit comprising the same and liquid crystal display WO2010147355A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020090053807A KR100940790B1 (en) 2009-06-17 2009-06-17 Reflective plate, backlight unit and liquid crystal display including the same
KR10-2009-0053807 2009-06-17

Publications (2)

Publication Number Publication Date
WO2010147355A2 WO2010147355A2 (en) 2010-12-23
WO2010147355A3 true WO2010147355A3 (en) 2011-04-14

Family

ID=42083082

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2010/003826 WO2010147355A2 (en) 2009-06-17 2010-06-15 Reflective plate for backlight unit, backlight unit comprising the same and liquid crystal display

Country Status (2)

Country Link
KR (1) KR100940790B1 (en)
WO (1) WO2010147355A2 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102066081B1 (en) * 2013-01-14 2020-01-14 엘지디스플레이 주식회사 Back light unit and liquid crystal display device using the same
CN105068177A (en) * 2015-09-18 2015-11-18 京东方科技集团股份有限公司 Optical assembly and display device

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003294948A (en) * 2002-04-08 2003-10-15 Nitto Denko Corp Band filter and surface light source device using the same
JP2004029695A (en) * 2002-04-30 2004-01-29 Casio Comput Co Ltd Display apparatus
JP2005292423A (en) * 2004-03-31 2005-10-20 Dainippon Printing Co Ltd Polarized light selecting reflection sheet, projection screen provided with the same, and projection system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100682356B1 (en) * 2000-06-14 2007-02-15 엘지.필립스 엘시디 주식회사 Transparent and Reflective Type Liquid Crystal Display Apparatus
JP4008358B2 (en) * 2003-01-10 2007-11-14 日東電工株式会社 Method for producing broadband cholesteric liquid crystal film
KR100722212B1 (en) * 2004-12-09 2007-05-29 옵티맥스 테크놀러지 코포레이션 Cholesteric liquid crystal light control film

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003294948A (en) * 2002-04-08 2003-10-15 Nitto Denko Corp Band filter and surface light source device using the same
JP2004029695A (en) * 2002-04-30 2004-01-29 Casio Comput Co Ltd Display apparatus
JP2005292423A (en) * 2004-03-31 2005-10-20 Dainippon Printing Co Ltd Polarized light selecting reflection sheet, projection screen provided with the same, and projection system

Also Published As

Publication number Publication date
WO2010147355A2 (en) 2010-12-23
KR100940790B1 (en) 2010-02-10

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