WO2007036877A3 - Back light unit - Google Patents

Back light unit Download PDF

Info

Publication number
WO2007036877A3
WO2007036877A3 PCT/IB2006/053493 IB2006053493W WO2007036877A3 WO 2007036877 A3 WO2007036877 A3 WO 2007036877A3 IB 2006053493 W IB2006053493 W IB 2006053493W WO 2007036877 A3 WO2007036877 A3 WO 2007036877A3
Authority
WO
WIPO (PCT)
Prior art keywords
guide plate
light guide
unit
back light
light
Prior art date
Application number
PCT/IB2006/053493
Other languages
French (fr)
Other versions
WO2007036877A2 (en
Inventor
Hugo J Cornelissen
Jaap Bruinink
Original Assignee
Koninkl Philips Electronics Nv
Hugo J Cornelissen
Jaap Bruinink
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 Koninkl Philips Electronics Nv, Hugo J Cornelissen, Jaap Bruinink filed Critical Koninkl Philips Electronics Nv
Publication of WO2007036877A2 publication Critical patent/WO2007036877A2/en
Publication of WO2007036877A3 publication Critical patent/WO2007036877A3/en

Links

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
    • G02B6/0035—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
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—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

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)

Abstract

A back light unit (110) for a liquid crystal display is provided. The unit comprises a light guide plate (102), a reflecting surface (101) arranged parallel and adjacent to the back surface of the light guide plate. Further, the light guide plate (102) comprises an interfacing surface (104) between a first material and a second material, which interfacing surface comprises microstructures (105) which are arranged such that light is outcoupled from said light guide plate (102) towards said reflecting surface (101). By using a backlight unit of the invention, the need for diffusers between the backlight unit and the liquid crystal cell of an LCD is reduced.
PCT/IB2006/053493 2005-09-30 2006-09-26 Back light unit WO2007036877A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP05109067.8 2005-09-30
EP05109067 2005-09-30

Publications (2)

Publication Number Publication Date
WO2007036877A2 WO2007036877A2 (en) 2007-04-05
WO2007036877A3 true WO2007036877A3 (en) 2007-08-02

Family

ID=37900155

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/053493 WO2007036877A2 (en) 2005-09-30 2006-09-26 Back light unit

Country Status (2)

Country Link
TW (1) TW200717135A (en)
WO (1) WO2007036877A2 (en)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8735791B2 (en) 2010-07-13 2014-05-27 Svv Technology Innovations, Inc. Light harvesting system employing microstructures for efficient light trapping
EP2979310B1 (en) 2013-03-29 2019-07-03 Signify Holding B.V. Light emitting device comprising wavelength converter
CN105074944A (en) 2013-03-29 2015-11-18 皇家飞利浦有限公司 Light emitting device comprising wavelength converter
PL3011608T3 (en) 2013-06-20 2017-09-29 Philips Lighting Holding B.V. Light emitting device
CN105393046B (en) 2013-07-19 2019-04-23 飞利浦照明控股有限公司 Luminaire and method for being dimmed to luminaire
EP3060955B1 (en) 2013-10-25 2023-06-28 Signify Holding B.V. Light emitting device
CN106133567A (en) 2014-05-14 2016-11-16 飞利浦照明控股有限公司 Luminaire

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0778484A2 (en) * 1995-12-05 1997-06-11 Canon Kabushiki Kaisha Illumination device and liquid crystal apparatus including same
JP2000305081A (en) * 1999-04-20 2000-11-02 Nitto Denko Corp Liquid crystal display device and light transmission plate
DE19963915A1 (en) * 1999-12-31 2001-08-09 Bosch Gmbh Robert Back lighting apparatus for backlighting a liquid crystal cell
EP1215526A1 (en) * 2000-07-11 2002-06-19 Mitsubishi Chemical Corporation Surface light source device
US20030058383A1 (en) * 2001-09-26 2003-03-27 Jagt Hendrik Johannes Boudewijn Micro-structured illumination system for providing polarized light
US20030095401A1 (en) * 2001-11-20 2003-05-22 Palm, Inc. Non-visible light display illumination system and method
WO2003056384A1 (en) * 2001-12-27 2003-07-10 Samsung Electronics Co., Ltd. Liquid crystal display apparatus
EP1564581A1 (en) * 2004-02-16 2005-08-17 Citizen Electronics Co., Ltd. Planar light source

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0778484A2 (en) * 1995-12-05 1997-06-11 Canon Kabushiki Kaisha Illumination device and liquid crystal apparatus including same
JP2000305081A (en) * 1999-04-20 2000-11-02 Nitto Denko Corp Liquid crystal display device and light transmission plate
US7012660B1 (en) * 1999-04-20 2006-03-14 Nitto Denko Corporation Liquid-crystal display device and light pipe
DE19963915A1 (en) * 1999-12-31 2001-08-09 Bosch Gmbh Robert Back lighting apparatus for backlighting a liquid crystal cell
EP1215526A1 (en) * 2000-07-11 2002-06-19 Mitsubishi Chemical Corporation Surface light source device
US20030058383A1 (en) * 2001-09-26 2003-03-27 Jagt Hendrik Johannes Boudewijn Micro-structured illumination system for providing polarized light
US20030095401A1 (en) * 2001-11-20 2003-05-22 Palm, Inc. Non-visible light display illumination system and method
WO2003056384A1 (en) * 2001-12-27 2003-07-10 Samsung Electronics Co., Ltd. Liquid crystal display apparatus
EP1564581A1 (en) * 2004-02-16 2005-08-17 Citizen Electronics Co., Ltd. Planar light source

Also Published As

Publication number Publication date
WO2007036877A2 (en) 2007-04-05
TW200717135A (en) 2007-05-01

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