CA2042060A1 - Backlighting apparatus - Google Patents

Backlighting apparatus

Info

Publication number
CA2042060A1
CA2042060A1 CA2042060A CA2042060A CA2042060A1 CA 2042060 A1 CA2042060 A1 CA 2042060A1 CA 2042060 A CA2042060 A CA 2042060A CA 2042060 A CA2042060 A CA 2042060A CA 2042060 A1 CA2042060 A1 CA 2042060A1
Authority
CA
Canada
Prior art keywords
light
light pipe
reflect
lamps
pipe
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.)
Granted
Application number
CA2042060A
Other languages
French (fr)
Other versions
CA2042060C (en
Inventor
David L. Bond
Kevin D. Kaschke
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.)
Motorola Solutions Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2042060A1 publication Critical patent/CA2042060A1/en
Application granted granted Critical
Publication of CA2042060C publication Critical patent/CA2042060C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface 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
    • G02B6/0035—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
    • G02B6/0045—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 by shaping at least a portion of the light guide
    • G02B6/0046—Tapered light guide, e.g. wedge-shaped 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
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • G—PHYSICS
    • G02—OPTICS
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs
    • G09F2013/1804—Achieving homogeneous illumination
    • G09F2013/1831—Achieving homogeneous illumination using more than one light source

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)
  • Supplying Of Containers To The Packaging Station (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • External Artificial Organs (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

Improved backlighting apparatus evenly illuminates positive and negative LCDs under all ambient lighting conditions. In-candescent lamps (301-304) provide light for distribution by a light pipe (101). The bottom of the light pipe (101) is selectively painted white to reflect light to the top of the light pipe (101) while the unpainted areas reflect light internal to the light pipe (101).
controlling hot and dim spots. The corners of the light pipe (101) near the lamps (301-304) are dual angled to reflect the light into the center of the display. The burn-out of a lamp (301-304) will not substantially affect the even lighting capabilities of the appar-atus.
CA002042060A 1989-10-02 1990-08-22 Backlighting apparatus Expired - Fee Related CA2042060C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US07/415,741 US4975808A (en) 1989-10-02 1989-10-02 Backlighting apparatus
US415,741 1989-10-02
PCT/US1990/004718 WO1991005202A1 (en) 1989-10-02 1990-08-22 Backlighting apparatus

Publications (2)

Publication Number Publication Date
CA2042060A1 true CA2042060A1 (en) 1991-04-03
CA2042060C CA2042060C (en) 1994-11-01

Family

ID=23646995

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002042060A Expired - Fee Related CA2042060C (en) 1989-10-02 1990-08-22 Backlighting apparatus

Country Status (8)

Country Link
US (1) US4975808A (en)
EP (1) EP0446324B1 (en)
CN (1) CN1017289B (en)
AT (1) ATE145716T1 (en)
AU (1) AU625629B2 (en)
CA (1) CA2042060C (en)
DE (1) DE69029258T2 (en)
WO (1) WO1991005202A1 (en)

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DE19521254A1 (en) * 1994-06-24 1996-01-04 Minnesota Mining & Mfg Display system with brightness boosting film
US6712481B2 (en) 1995-06-27 2004-03-30 Solid State Opto Limited Light emitting panel assemblies
US5975711A (en) * 1995-06-27 1999-11-02 Lumitex, Inc. Integrated display panel assemblies
US7108414B2 (en) 1995-06-27 2006-09-19 Solid State Opto Limited Light emitting panel assemblies
US5613751A (en) 1995-06-27 1997-03-25 Lumitex, Inc. Light emitting panel assemblies
US5895115A (en) * 1996-01-16 1999-04-20 Lumitex, Inc. Light emitting panel assemblies for use in automotive applications and the like
US6072551A (en) * 1996-02-14 2000-06-06 Physical Optics Corporation Backlight apparatus for illuminating a display with controlled light output characteristics
US5838403A (en) * 1996-02-14 1998-11-17 Physical Optics Corporation Liquid crystal display system with internally reflecting waveguide for backlighting and non-Lambertian diffusing
JP3466817B2 (en) * 1996-05-02 2003-11-17 ローム株式会社 LED light emitting device and manufacturing method
JP3860249B2 (en) * 1996-05-02 2006-12-20 ローム株式会社 Surface emitting lighting device
US6166787A (en) * 1998-03-17 2000-12-26 Motorola, Inc. Optical display device having prismatic film for enhanced viewing
US6285425B1 (en) 1998-06-29 2001-09-04 Motorola, Inc. Ridged reflector for an optical display having a curved and a planar facet for each ridge
US6285426B1 (en) 1998-07-06 2001-09-04 Motorola, Inc. Ridged reflector having optically transmissive properties for an optical display device
US7364341B2 (en) * 1999-02-23 2008-04-29 Solid State Opto Limited Light redirecting films including non-interlockable optical elements
US6752505B2 (en) 1999-02-23 2004-06-22 Solid State Opto Limited Light redirecting films and film systems
US6827456B2 (en) 1999-02-23 2004-12-07 Solid State Opto Limited Transreflectors, transreflector systems and displays and methods of making transreflectors
TW514709B (en) 2000-05-04 2002-12-21 Koninkl Philips Electronics Nv Illumination system and display device
JP2002042529A (en) * 2000-07-24 2002-02-08 Sanyo Electric Co Ltd Surface lighting device
JP3670949B2 (en) * 2000-09-27 2005-07-13 三洋電機株式会社 Surface light source device
KR100701014B1 (en) * 2000-11-22 2007-03-29 삼성전자주식회사 A light guide plate, a liquid crystal display module and a liquid crystal display device having the same
CN1268972C (en) * 2001-04-10 2006-08-09 皇家菲利浦电子有限公司 Illumination device and display device
KR20030008790A (en) * 2001-07-20 2003-01-29 삼성전자 주식회사 Liquid crystal display device
US20030206256A1 (en) * 2002-05-06 2003-11-06 Drain Kieran F. Display device with backlight
US7048397B2 (en) * 2003-05-13 2006-05-23 Siemens Vdo Automotive Corporation Illumination of gauge indicator scale
US7510316B2 (en) * 2003-07-14 2009-03-31 Koninklijke Philips Electronics N.V. Ultra compact illumination system for display systems
KR100567249B1 (en) * 2003-09-06 2006-04-03 현대모비스 주식회사 Light guide plate for liquid crystal display back light and liquid crystal display module of car audio in use with the light guide plate
US7182492B1 (en) * 2003-12-22 2007-02-27 Robert Louis Walter License plate system having enhanced illumination
JP4489423B2 (en) * 2003-12-26 2010-06-23 シャープ株式会社 Backlight and liquid crystal display device
US20050157521A1 (en) * 2004-01-20 2005-07-21 Shih-Hsien Chen Backlight assembly for liquid crystal display
KR100590535B1 (en) * 2004-01-24 2006-06-15 삼성전자주식회사 Back light unit
US7199868B2 (en) * 2004-11-02 2007-04-03 Identix Incorporated High performance fingerprint imaging system
US8320645B2 (en) * 2004-11-02 2012-11-27 Identix Incorporated High performance multi-mode palmprint and fingerprint scanning device and system
WO2006052755A2 (en) 2004-11-04 2006-05-18 Solid State Opto Limited Long curved wedges in an optical film
KR100716989B1 (en) 2004-12-23 2007-05-10 삼성전자주식회사 Back light system and liquid crystal display apparatus employing it
US7866871B2 (en) 2006-01-13 2011-01-11 Avery Dennison Corporation Light enhancing structures with a plurality of arrays of elongate features
US7674028B2 (en) 2006-01-13 2010-03-09 Avery Dennison Corporation Light enhancing structures with multiple arrays of elongate features of varying characteristics
US7366393B2 (en) 2006-01-13 2008-04-29 Optical Research Associates Light enhancing structures with three or more arrays of elongate features
US7545569B2 (en) * 2006-01-13 2009-06-09 Avery Dennison Corporation Optical apparatus with flipped compound prism structures
TWI274196B (en) * 2006-01-27 2007-02-21 Au Optronics Corp Light guiding structure
US8462292B2 (en) 2008-07-31 2013-06-11 Rambus Delaware Llc Optically transmissive substrates and light emitting assemblies and methods of making same, and methods of displaying images using the optically transmissive substrates and light emitting assemblies
JP5450778B2 (en) * 2012-06-08 2014-03-26 シャープ株式会社 Edge light type surface light source device and illumination device

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Also Published As

Publication number Publication date
CA2042060C (en) 1994-11-01
US4975808A (en) 1990-12-04
AU6413690A (en) 1991-04-28
EP0446324A1 (en) 1991-09-18
DE69029258T2 (en) 1997-06-05
EP0446324A4 (en) 1993-06-30
CN1017289B (en) 1992-07-01
EP0446324B1 (en) 1996-11-27
CN1050785A (en) 1991-04-17
ATE145716T1 (en) 1996-12-15
DE69029258D1 (en) 1997-01-09
AU625629B2 (en) 1992-07-16
WO1991005202A1 (en) 1991-04-18

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Legal Events

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EEER Examination request
MKLA Lapsed