EP1567892A2 - Dispositif d'eclairage - Google Patents

Dispositif d'eclairage

Info

Publication number
EP1567892A2
EP1567892A2 EP03785516A EP03785516A EP1567892A2 EP 1567892 A2 EP1567892 A2 EP 1567892A2 EP 03785516 A EP03785516 A EP 03785516A EP 03785516 A EP03785516 A EP 03785516A EP 1567892 A2 EP1567892 A2 EP 1567892A2
Authority
EP
European Patent Office
Prior art keywords
light
light guide
lighting arrangement
display
coupling
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.)
Withdrawn
Application number
EP03785516A
Other languages
German (de)
English (en)
Inventor
Jürgen WIDMANN
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.)
Aumovio Germany GmbH
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1567892A2 publication Critical patent/EP1567892A2/fr
Withdrawn legal-status Critical Current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
    • G02B6/0018—Redirecting means 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
    • 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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • 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
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels

Definitions

  • the invention relates to a lighting arrangement for a display with at least one light-emitting element.
  • LED light-emitting diodes
  • LCD liquid crystal displays
  • the lighting arrangement comprises a housing 1 with an integrated transparent diffusing screen 9.
  • light-emitting diodes 3 are distributed in a matrix below the diffusing screen 9 and the display 2 on a circuit board (not shown here).
  • the size of the circuit board depends on the necessary distribution according to the area of the display 2 to be backlit and corresponds approximately to the size of the area of the display 2.
  • the disadvantage of such a lighting arrangement is the high circuit complexity and the use of a large number of discrete components. This is associated with high manufacturing costs and a large assembly area on the conductor track and thus assembly on both sides of the circuit board.
  • the present invention is based on the object of proposing a lighting arrangement which has a simpler and less expensive structure.
  • the object is achieved by a lighting arrangement with the features of claim 1. Further refinements of the invention result from the subclaims.
  • a light guide is provided in the lighting arrangement, which has a coupling-in and coupling-out area, the coupling-out area being a multiple of the coupling-in area and the light guide deflecting the light between the coupling-in and coupling-out area.
  • the circuit board on which the light-emitting elements are arranged is advantageously arranged parallel to the display.
  • the light guide takes on the function of guiding the light, the light being emitted via the decoupling surface facing the display.
  • the coupling and decoupling surfaces are preferably arranged parallel to one another.
  • the coupling surface of the light guide is roughened on the surface in order to achieve homogeneous illumination of the lighting surface.
  • the light-emitting elements are advantageously arranged on a printed circuit board only on a surface corresponding to the size of the coupling surface of the light guide, the printed circuit board being mounted parallel to the display.
  • Hig optical power LEDs which are significantly brighter than conventional LEDs, are preferably used as light-emitting elements.
  • the light guide is wedge-shaped below the display and has an angled design to the side of the display, which is provided with an inclined outside. If the light from the LEDs strikes this oblique outside, it is deflected into the wedge-shaped part of the light guide, so that the light emerges at the decoupling surface.
  • These environmental cable enables targeted lighting of the entire area. Due to the use of high-optical power LEDs, the area can be illuminated with the required luminosity.
  • the lighting arrangement has a housing which is made in one piece from plastic with the light guide, in particular in the two-component injection molding process, results in a particular cost advantage in the production.
  • the use of high-optical power LEDs and the reduction in the number of LEDs required enable a reduction in the board area required and thus a reduction in component costs.
  • Figure 1 is a plan view of a lighting arrangement according to the prior art
  • Figure 2 shows an embodiment as a sectional view of a lighting arrangement according to the invention.
  • Figure 2 shows a lighting arrangement according to the invention in a cross-sectional view.
  • the arrangement comprises a plastic housing 1 with a light guide 4, in which light from light-emitting elements, preferably high-optical power LEDs, is fed.
  • An LED 3 is mounted on a circuit board 6, which has a circuit arrangement for supplying the light-emitting diode 3.
  • the light guide 4 consists of a transparent material, for example polycarbonate or polymethyl methacrylate.
  • the light guide 4 is arranged below a display 2 and has an input and output pelflache, with the coupling-out area being a multiple of the coupling-in area.
  • the coupling surface of the light guide is arranged parallel to the coupling surface of the light guide. However, it is not arranged directly below the display 2, but is located in a side area of the
  • the light guide 4 is designed such that the light fed into the coupling surface of the light guide hits an inclined outer wall 5 of the light guide 4 and is deflected into a wedge-shaped configuration of the light guide 4 angled by 90 ° and exits at the decoupling point, whereby the wedge-shaped design of the light guide 4 tapers on the opposite side of the light guide 4 from the inclined outer wall 5.
  • the deflection angle can be arbitrary, so that, depending on the technical requirements, the light does not have to be fed in parallel to the illumination surface of the display 2.
  • the light in such a light guide 4 can be fed in by the light-emitting element in such a way that it emerges again at a specific point on the light guide, since that
  • Light is reflected several times within the light guide on the outside. On the basis of the geometric shape of the light guide, it can thus be determined at which point a light that is fed in at a certain angle emerges again at the decoupling point.
  • the light guidance due to the shape of the light guide can thus be optimal, so that a maximum of light for the lighting can be achieved with a minimal coupling area.
  • the plastic housing is made in one piece with the light guide and preferably as a two-component injection molding.
  • the display 2 is delimited on the side facing the viewer by a front panel 8.
  • these lighting arrangements V Before Using find in a motor vehicle.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un dispositif d'éclairage destiné à un affichage (2) comprenant au moins un élément luminescent (3). Un guide d'onde optique (4) se trouve à l'arrière de l'affichage (2) et présente une surface d'entrée de lumière et une surface de sortie de lumière qui sont parallèles entre elles, la surface de sortie de lumière ayant une aire qui est un multiple de l'aire de la surface d'entrée de lumière, et le guide d'onde optique (4) déviant la lumière entre la surface d'entrée de lumière et la surface de sortie de lumière.
EP03785516A 2002-12-02 2003-11-14 Dispositif d'eclairage Withdrawn EP1567892A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10256179 2002-12-02
DE2002156179 DE10256179A1 (de) 2002-12-02 2002-12-02 Beleuchtungsanordnung
PCT/DE2003/003785 WO2004051318A2 (fr) 2002-12-02 2003-11-14 Dispositif d'eclairage

Publications (1)

Publication Number Publication Date
EP1567892A2 true EP1567892A2 (fr) 2005-08-31

Family

ID=32318891

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03785516A Withdrawn EP1567892A2 (fr) 2002-12-02 2003-11-14 Dispositif d'eclairage

Country Status (3)

Country Link
EP (1) EP1567892A2 (fr)
DE (1) DE10256179A1 (fr)
WO (1) WO2004051318A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10315773A1 (de) * 2003-04-07 2004-11-11 BSH Bosch und Siemens Hausgeräte GmbH Anzeigeeinheit für ein Haushaltsgerät
DE102005042523A1 (de) * 2005-05-31 2006-12-07 Osram Opto Semiconductors Gmbh Beleuchtungseinrichtung

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2324364A (en) * 1997-04-19 1998-10-21 Ford Motor Co Light input device for a light pipe illuminator
KR100450542B1 (ko) * 1998-10-29 2004-10-01 가부시키가이샤 히타치세이사쿠쇼 조명 장치 및 이를 이용한 액정 표시 장치
DE19860695B4 (de) * 1998-12-29 2011-04-28 Siemens Ag Lichtquellenelement mit schräggestellter Lichtaustrittsfläche
DE19957611A1 (de) * 1999-11-30 2001-06-07 Osram Opto Semiconductors Gmbh Beleuchtungsanordnung
WO2002006891A1 (fr) * 2000-07-17 2002-01-24 Siemens Aktiengesellschaft Afficheur
JP4501295B2 (ja) * 2001-03-14 2010-07-14 パナソニック株式会社 面発光装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004051318A3 *

Also Published As

Publication number Publication date
WO2004051318A2 (fr) 2004-06-17
DE10256179A1 (de) 2004-06-17
WO2004051318A3 (fr) 2004-09-23

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