EP2054744A1 - Fibre optique et dispositif optique - Google Patents

Fibre optique et dispositif optique

Info

Publication number
EP2054744A1
EP2054744A1 EP07817559A EP07817559A EP2054744A1 EP 2054744 A1 EP2054744 A1 EP 2054744A1 EP 07817559 A EP07817559 A EP 07817559A EP 07817559 A EP07817559 A EP 07817559A EP 2054744 A1 EP2054744 A1 EP 2054744A1
Authority
EP
European Patent Office
Prior art keywords
light guide
radiation
entrance surface
main extension
optical device
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Withdrawn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
EP07817559A
Other languages
German (de)
English (en)
Inventor
Josef Hüttner
Julius Muschaweck
Georg Bogner
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.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of EP2054744A1 publication Critical patent/EP2054744A1/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Withdrawn legal-status Critical Current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
    • 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
    • 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

Definitions

  • the present invention relates to an optical waveguide and an optical device formed with an optical waveguide.
  • Such light guides are used, for example, for backlight arrangements, such as for display devices.
  • the light of a light source should be coupled as efficiently as possible in the light guide.
  • a propagation obliquely to the light guide plane is advantageous within the light guide.
  • the radiation coupled into the optical waveguide should be distributed as efficiently and uniformly as possible to the radiation decoupling surface.
  • Object of the present invention to provide an optical device with such a light guide.
  • an optical light guide has a main extension direction, at least one radiation entrance surface and a longitudinal extension to the main extension direction
  • Radiation exit surface provided, wherein at least one radiation entrance surface is transverse to the main extension direction, and the at least one
  • Radiation entrance surface has two convex portions which are interconnected by a crescent-shaped or concave-shaped notch.
  • the convexly curved subregions of the at least one radiation entrance surface in conjunction with the notch or concave shaped indentation cause the coupled radiation to be deflected directly or indirectly onto the radiation exit surface, in particular the propagation of radiation components along the main extension direction of the light guide and thus into Direction of the at least one radiation entrance surface opposite side surface is reduced.
  • the optical waveguide along the main direction of extension associated with a median plane ⁇ , which penetrates the at least one radiation entrance surface in the region of the notch.
  • the at least one radiation entrance surface and the light guide can be designed symmetrically to the center plane. This embodiment has the advantage that radiation above and below the center plane is similar in the
  • Optical fiber propagates, so that a homogeneous distribution of the radiation is achieved.
  • the light guide is one of the convex portions or the two convex portions are shaped like a cylinder.
  • the light guide is planar, in particular planar.
  • a planar design is to be understood as meaning a substantially planar design of the light guide, although a slight curvature or curvature is acceptable.
  • Such light guides are particularly suitable for the backlighting of flat or slightly curved display devices such as LCD displays or vehicle fittings. Especially in the latter case, a slight curvature or curvature may be appropriate.
  • a wedge-shaped embodiment essentially refers to a wedge-shaped thickness of the optical waveguide, the thickness of the optical waveguide decreasing along the main extension direction of the optical waveguide with increasing distance from the radiation entry surface.
  • Radiation decoupling achieved as homogeneous a luminance.
  • the radiation coupled into the optical waveguide is thus distributed as evenly as possible over the radiation decoupling surface.
  • the at least one radiation entrance surface of the light guide at least partially structuring.
  • This structuring is preferably carried out transversely to the course direction of the notch.
  • the structuring may include, for example, a plurality of grooves or elevations, which are arranged in the same direction and in particular transversely to the direction of the notch.
  • one of the radiation exit surface opposite interface of the light guide is reflective or / and provided with a reflector layer.
  • this interface can be designed, for example, totally reflective.
  • a coating of the interface with a reflector layer for example a metal layer or metal oxide layer, is advantageous. Such an interface advantageously deflects the impinging radiation in the direction of the radiation-decoupling surface.
  • At least one boundary surface of the light guide which bears against the radiation exit surface is reflective and / or provided with a reflector layer.
  • this interface can be designed, for example, totally reflective.
  • a coating of the interface with a reflector layer for example a metal layer or metal oxide layer, is advantageous. Such an interface advantageously directs the incident radiation in the direction of
  • Radiation decoupling surface around is both the radiation exit surface opposite interface of the light guide and in addition are at the Radiation exit surface adjacent interfaces of the light guide to which no radiation sources are arranged, formed reflective or / and provided with a reflector layer.
  • the light guide is integrally produced, preferably in one
  • the light guide may include polycarbonate.
  • the light guide has coupling-out structures at least in regions. For a homogeneous distribution of the radiation on the radiation decoupling surface takes the number of
  • Decoupling structures are preferably suitable three-dimensional decoupling structures, particularly preferably Kugelkappen- or pyramid forms.
  • the three-dimensional coupling-out structures it is possible for the three-dimensional coupling-out structures to be directed into the optical waveguide or to be directed out of the optical waveguide as protrusions.
  • the decoupling structures can be designed as a printed color grid, as color dots or as transverse grooves.
  • An optical device formed with an optical waveguide of the type mentioned above has at least one radiation source on the part of the at least one radiation entrance surface, so that the at least one Radiation inlet surface of the radiation source is arranged downstream in the emission direction.
  • optical device provides that seen in the main extension direction of the optical fiber, the distance of the radiation source from the optical fiber is smaller than a dimension of the optical fiber perpendicular to the main extension direction of the optical fiber.
  • the length of the radiation source is small compared to the length of the radiation entrance surface of the light guide.
  • a length of the radiation source is to be understood as the effective size of the radiation source, the effective size in this case being defined by the radiation source independently of a housing in which the radiation source can be arranged.
  • the intermediate space between the radiation source and the radiation entrance surface of the light guide contains only air.
  • the radiation source is an LED, in particular an LED component or an LED chip.
  • Such radiation sources are characterized by a comparatively low energy consumption and a correspondingly high efficiency, a simple control and in particular a compact design out. The latter is particularly advantageous for the formation of space-saving optical devices, such as those used for the backlighting of mobile phones or mobile computers.
  • the radiation source is an LED which emits mixed radiation having a color location in the white region of the CIE standard color chart.
  • the "color locus” defines the numerical values which describe the color of the emitted light of the component in the CIE standard color chart.
  • the optical device according to the invention in conjunction with a white LED as the radiation source, which radiation of different wavelength ranges, for example in the blue and yellow wavelengths, emits in a different directional distribution and thus color structures in the
  • FIG. 1 shows a schematic sectional view of a first exemplary embodiment of an optical device according to the invention with an optical waveguide according to the invention
  • FIG. 2 shows a schematic sectional view of a further exemplary embodiment of an optical device according to the invention with an optical waveguide according to the invention
  • FIG. 3 shows a graphic representation of the light intensity distribution directly behind the radiation entrance surface of an embodiment corresponding to FIG. 1, and FIG.
  • Figure 4 is a schematic perspective detail view of a third embodiment of an optical waveguide according to the invention.
  • the optical device shown in FIG. 1 comprises an optical waveguide 1 with a main extension direction and a radiation entry surface 2 which is transverse to the optical waveguide
  • Main extension direction runs. Furthermore, the light guide 1 has a radiation exit surface 3, which extends along the main extension direction.
  • the radiation entrance surface 2 is formed with, two convex, preferably cylindrical, partial regions 4a, 4b, which are connected to one another by means of a concavely curved notch 5.
  • Notching can also be chosen arbitrarily small, so that in the limiting case, a kink-like notch, which thus has a peak in the direction of the light guide body results.
  • the smallest possible radius of curvature or a tip that is as sharp as possible is preferred for the notch, since this effectively suppresses propagation of radiation along the main extension direction.
  • the light guide 1 is as shown in FIG.
  • the light guide may have a center plane 6, to which the light guide and in particular the convex portions 4a, 4b of the radiation entrance surface 2 are symmetrical.
  • a radiation source 7 preferably an LED
  • a radiation source 7 is provided at the radiation entrance surface.
  • a radiation source 7 preferably an LED
  • a plurality of LEDs which, for example, can be arranged line-like in the course direction of the notch.
  • Radiation entrance surfaces may be provided, in front of which one or more LEDs are arranged. Particularly preferred are two opposing radiation entrance surface are formed, on each of which one or more LEDs are arranged.
  • the beam path of the radiation generated by the radiation source is schematically based on a plurality of partial beams. 8 shown. These partial beams are refracted by the convexly shaped partial regions 4a, 4b of the radiation entrance surface in the direction of the radiation exit surface 3 or in the direction of the surface of the light guide opposite the radiation exit surface 3. As a result, a propagation along the main extension direction or the center plane 6 of the light guide is suppressed.
  • Radiation exit surface or the opposite interface hardly interacts and thus does not readily meet the radiation exit surface 3 and contributes to the backlighting. This is the more disadvantageous the more radiation is emitted in this direction from the radiation source.
  • the design of the entrance surface of the light guide allows a compact construction of the optical device, wherein in particular the distance between the radiation source and the light guide can be advantageously selected low.
  • the distance is to be understood as meaning the distance A seen in the vertical direction, that is to say the distance between the radiation source and a vertical plane adjoining the light guide.
  • this distance may be smaller than a vertical dimension, such as the thickness D, of the light guide.
  • FIG. 2 a shows a further exemplary embodiment of an optical device with an optical light guide.
  • the optical device shown in Figure 2 differs from the optical device of Figure 1 in that the light guide 1 is wedge-shaped.
  • a wedge-shaped design essentially refers to a wedge-shaped thickness of the optical waveguide, the thickness of the optical waveguide 1 decreasing along the main extension direction of the optical waveguide 1 with increasing distance from the radiation entrance surface 2.
  • Such a light guide achieves the most homogeneous luminance possible at the radiation output surface 3.
  • the radiation coupled into the optical waveguide 1 is thus distributed as evenly as possible over the radiation decoupling surface 3.
  • the light guide 1 is introduced, for example, on the light guide 1
  • the decoupling structures 13 may additionally or alternatively be arranged on the radiation decoupling surface 3.
  • decoupling structures 13 are preferably three-dimensional Auskoppel proprietor, more preferably Kugelkappen- or pyramid forms. In this case, it is possible for the three-dimensional coupling-out structures 13 to be directed into the light guide 1 or to be directed out of the light guide 1 as elevations.
  • the decoupling structures 13 can be designed as a printed color grid, as color dots or as transverse grooves. For the most homogeneous possible luminance at the radiation decoupling surface 3, the number of decoupling structures 13 along the main extension direction of the optical waveguide 1 increases with increasing distance from the radiation entry surface 2.
  • FIG. 3 shows the resulting light intensity distribution immediately behind the radiation entrance surface for an optical waveguide corresponding to FIG. 1, which was determined on the basis of a simulation calculation.
  • the simulation calculation was based on a light guide with a thickness D of about 2 mm and a light-emitting diode chip with an edge length of about 500 ⁇ m and approximately Lambertian radiation characteristics, which is arranged at a distance A of about 0.4 mm in front of the light guide.
  • Main extension direction of the light guide is relatively small and increases with increasing angle up to an angle of about 30 °.
  • the majority of the radiation is collimated in a radiation beam whose propagation angle encloses an angle of about 25 ° with the central plane.
  • the optical waveguide has an advantageously high coupling-in efficiency, namely a purely geometrical coupling-in efficiency of approximately 90% or a coupling-in efficiency of approximately 85% taking into account the reflection losses during the coupling.
  • a light guide with the shape shown can be produced by injection molding without any special technical effort.
  • a one-piece design of the light guide is advantageous.
  • materials are particularly suitable, which consist of plastic, preferably PMMA.
  • the light guide may include polycarbonate.
  • FIG. 4 shows a third embodiment of the optical waveguide is shown in a detailed view.
  • the shape of the radiation entrance surface, in particular the configuration of the convex portions 4a, 4b and the notches 5 connecting these portions corresponds largely to the light guide shown in FIG. 1 or 2.
  • the radiation entrance surface 2 in the region which is provided as entry region 9 for the radiation to be coupled into the light guide has a structuring 10 in the form of a corrugation, the individual corrugations 11 of the corrugation being transverse to the extension direction 12 of the two subregions 4a 4b connecting notch 5 are arranged.
  • the inlet-side radiation beam of the radiation source is widened in the direction of progression of the notch, and thus causes an advantageously homogeneous distribution of the injected radiation in the lateral direction.

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)
  • Planar Illumination Modules (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Led Device Packages (AREA)

Abstract

L'invention concerne une fibre (1) optique avec un sens de projection principal, au moins une surface (2) d'incidence du rayonnement et une surface (3) de sortie du rayonnement qui s'étend le long du sens de projection principal. Selon l'invention, au moins une surface (2) de sortie du rayonnement s'étend transversalement par rapport au sens (3) de projection principal et la ou les surfaces (2) d'incidence du rayonnement présentent deux zones (4a, 4b) partielles à courbure convexe qui sont reliées entre elles par une encoche (5) de type pli ou de forme concave. L'invention concerne également un dispositif optique réalisé avec une telle fibre optique ainsi qu'un dispositif d'affichage.
EP07817559A 2006-09-29 2007-09-21 Fibre optique et dispositif optique Withdrawn EP2054744A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006046235 2006-09-29
PCT/DE2007/001713 WO2008040306A1 (fr) 2006-09-29 2007-09-21 Fibre optique et dispositif optique

Publications (1)

Publication Number Publication Date
EP2054744A1 true EP2054744A1 (fr) 2009-05-06

Family

ID=38879773

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07817559A Withdrawn EP2054744A1 (fr) 2006-09-29 2007-09-21 Fibre optique et dispositif optique

Country Status (8)

Country Link
US (1) US8246232B2 (fr)
EP (1) EP2054744A1 (fr)
JP (1) JP2010505221A (fr)
KR (1) KR20090084830A (fr)
CN (1) CN101523253B (fr)
DE (1) DE112007002900A5 (fr)
TW (1) TWI366692B (fr)
WO (1) WO2008040306A1 (fr)

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TWI391021B (zh) 2008-12-22 2013-03-21 Young Optics Inc 發光二極體封裝體及投影裝置
US8622601B2 (en) * 2010-07-23 2014-01-07 Shenzhen China Star Optoelectronics Technology Co., Ltd. Backlight module and display apparatus
WO2013141020A1 (fr) * 2012-03-23 2013-09-26 コニカミノルタ株式会社 Plaque de guidage de lumière, dispositif d'éclairage et montant d'éclairage
CN104280812A (zh) * 2013-07-03 2015-01-14 苏州茂立光电科技有限公司 导光组件
DE102017130789A1 (de) * 2017-12-20 2019-06-27 Itz Innovations- Und Technologiezentrum Gmbh Flächiges oder stabförmiges Lichtleiterelement
DE102017130790A1 (de) * 2017-12-20 2019-06-27 Itz Innovations- Und Technologiezentrum Gmbh Flächiges oder stabförmiges Lichtleiterelement
DE102020104678A1 (de) 2020-02-21 2021-08-26 Marelli Automotive Lighting Reutlingen (Germany) GmbH Beleuchtungseinrichtung mit einem langgestreckten Lichtleiter und optimierter Lichteinkopplung

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Also Published As

Publication number Publication date
KR20090084830A (ko) 2009-08-05
US8246232B2 (en) 2012-08-21
WO2008040306A1 (fr) 2008-04-10
TWI366692B (en) 2012-06-21
US20100103696A1 (en) 2010-04-29
CN101523253A (zh) 2009-09-02
JP2010505221A (ja) 2010-02-18
TW200821646A (en) 2008-05-16
DE112007002900A5 (de) 2009-09-03
CN101523253B (zh) 2012-12-12

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