EP3314164A1 - Dispositif d'éclairage indirect et procédé de fabrication d'un dispositif d'éclairage indirect - Google Patents

Dispositif d'éclairage indirect et procédé de fabrication d'un dispositif d'éclairage indirect

Info

Publication number
EP3314164A1
EP3314164A1 EP16731175.2A EP16731175A EP3314164A1 EP 3314164 A1 EP3314164 A1 EP 3314164A1 EP 16731175 A EP16731175 A EP 16731175A EP 3314164 A1 EP3314164 A1 EP 3314164A1
Authority
EP
European Patent Office
Prior art keywords
light guide
cylindrical
holographic
light
optical element
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Withdrawn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
EP16731175.2A
Other languages
German (de)
English (en)
Inventor
Rainer Hagen
Günther WALZE
Thomas Fäcke
Friedrich-Karl Bruder
Dennis Hönel
Thomas RÖLLE
Horst Berneth
Marc-Stephan Weiser
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.)
Covestro Deutschland AG
Original Assignee
Covestro Deutschland AG
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 Covestro Deutschland AG filed Critical Covestro Deutschland AG
Publication of EP3314164A1 publication Critical patent/EP3314164A1/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Withdrawn legal-status Critical Current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
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0028—Light guide, e.g. taper
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
    • G02B27/0938—Using specific optical elements
    • G02B27/095—Refractive optical elements
    • G02B27/0955—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical 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
    • 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
    • G02B6/0005—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 of the fibre type
    • G02B6/0006—Coupling light into the fibre
    • 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
    • G02B6/0005—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 of the fibre type
    • G02B6/001—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 of the fibre type the light being emitted along at least a portion of the lateral surface of the fibre

Definitions

  • the invention relates to an indirect lighting arrangement comprising at least one cylindrical light guide, wherein at least one end of the cylindrical light guide is adapted to couple light from a first light source in the cylindrical light guide and the lateral surface of the cylindrical light guide is arranged a coupling portion for optically coupling the cylindrical light guide with an arrangeable having plate-shaped light guide.
  • the invention relates to a method for producing an indirect lighting arrangement, a
  • BLU Backlight Unit
  • Alternative applications are general lighting systems and in particular lighting systems for motor vehicles.
  • the basic requirements for the radiation characteristic of the BLU are given, for example, in the case of liquid crystal display screens (LC displays) by the general quality criteria for the types of products available today and in particular by the technology of the imaging LC panels used. They can be described as follows: The light is to be emitted as a well-cou- pled, spectrally defined light beam, which maintains its properties over the entire area of the BLU constant, so that a uniform illumination of the entire LC panel is achieved from a main direction.
  • LC displays liquid crystal display screens
  • the main direction of illumination in conventional 2D vision LCDs is the vertical tilt of the LC panel surface and, in the case of special directional BLUs designed for autostereoscopic 3D vision, horizontal tilting in one direction.
  • LEDs light emitting diodes
  • LEDs are superior to fluorescent tubes, such as cold cathode fluorescent lamps, because of their compactness, good energy efficiency, low cost, wide choice of emission spectra, and the ability to group individual spot emitters into modules.
  • BLUs but also in other applications, a distinction is basically made between two different types of lighting arrangements, namely the direct lighting arrangement and the indirect lighting arrangement. These two different types differ significantly in their structure and functioning. In the following, only the more common indirect lighting arrangement is described, which can be designed to be particularly flat and thus fulfills today's requirement for a particularly small overall depth better than the direct lighting arrangement.
  • the most common BLU concept is based on indirect backlighting
  • Edge lighting The light of the LEDs is coupled over the length of the edge of a uniform or possibly segmented light guide plate, propagate via total reflection in the light guide and are by means of light extraction elements on the rear and / or on the front surface of the light guide and / or in its inner volume attached, directed in the direction of the LC panel.
  • a continuous luminous exit surface is realized.
  • a reflective screen or white light scatterers can be used to feed back leaked light back into the active light directing area.
  • Such edge-lit BLUs can be realized with a small space depth if necessary, which brings a design advantage and possibly also a functional advantage for the LCD with it.
  • Elements are angle corrected and homogenized, e.g. by Brightness Enhancement Films (BEF), which are attached as a foil or plate between the light guide and the panel.
  • BEF Brightness Enhancement Films
  • any kind of manufacturing tolerance affects the LED modules, in particular in their positioning relative to the coupling surface of the planar optical waveguide (in particular in interaction with the downstream light directing elements) the more critical the larger the area of the BLU is. This leads to undefined changes in the light path.
  • variations in the light field incident on the LC panel lead to variations in image contrast and / or to poor ones
  • a first light source can be coupled into the cylindrical light guide.
  • a collimator light-diffractive optical element, in the simplest case a converging lens
  • the light of the first light source can first be collected before it is coupled into the light guide rod at one of its ends.
  • This elongated light guide can have different cross sections.
  • the cross-section may be circular, square or a geometric shape with additional straight cut surface.
  • the cylindrical light guide has suitable outlet openings or coupling sections and / or coupling-out structures in order to decouple the light from the cylindrical light guide.
  • Decoupling structures are in particular particulate scattering centers, prismatic or lenticular grid structures. These cause that an elongated luminous surface on the lateral surface of the cylindrical light guide, so a coupling portion, can arise with a defined intensity distribution.
  • Such lighting arrangements can be incorporated, for example, in edge-lit BLUs by being arranged between a first light source and an arrangeable planar or planar light guide (waveguide).
  • the Light or light wave emerging from the elongate light guide can be coupled into the planar light guide via one of its edges. Examples of the prior art are disclosed in US 5,835,661 A and US 7,549,783 A.
  • the rod-shaped optical fibers known from the prior art have disadvantages.
  • these cylindrical optical fibers have scattering outcoupling elements.
  • the light emerges at angles which are not subject to total reflection in the planar light guide after being coupled into the planar light guide.
  • the luminosity of the BLU decreases.
  • the broad scattering cone has the problem known from conventional edge-type BLUs that the intensity of the light in the planar light guide decreases with increasing propagation path. This in turn hinders or even prevents the
  • the invention is based on the object of providing a lighting arrangement for indirect illumination, which allows a defined, targeted and homogeneous extraction of light from a cylindrical light guide in a simple manner.
  • the object is achieved according to a first aspect of the invention in a lighting arrangement for indirect lighting according to claim 1.
  • the illumination arrangement comprises at least one cylindrical light guide. At least one end of the cylindrical light guide is set up to couple light from a first light source into the cylindrical light guide.
  • the lateral surface of the cylindrical optical waveguide has a coupling section configured for optically coupling the cylindrical optical waveguide to an arrangeable plate-shaped optical waveguide.
  • At least the coupling portion has at least one holographic-optical element configured to emit light from the cylindrical light guide into the disposable plate-shaped light guide.
  • a holographic-optical element is understood to be an optical element which comprises a volume hologram (hereinafter referred to in short as a "hologram")
  • a volume hologram according to the present invention is a light-diffractive optical element based on a translucent film
  • the volume hologram when illuminated with light, deflects it into a new spatial direction, the light field produced being able to assume a wide variety of forms, as in the case of the previous one Holographic manufacturing process were established.
  • the cylindrical light guide has a coupling-out element in the form of a holographic-optical element, light can be coupled out of the cylindrical light guide in a defined, targeted and homogeneous manner.
  • the light guide according to the invention is designed to Light in particular with a vorgebaren angle range to couple into a plate-shaped light guide.
  • the indirect illumination arrangement comprises a substantially cylindrical light guide.
  • the elongate light guide has two substantially mutually parallel and oppositely disposed ends and a lateral surface. At least one of the ends or end surfaces of the cylindrical light guide is adapted to couple light or at least one light beam from a first light source into the cylindrical light guide.
  • the first light source may include, for example, at least one light emitting diode or a laser.
  • the light or the light beam from the first light source is in particular coupled into the cylindrical light guide in such a way that it propagates in the light guide according to the law of total internal reflection (TIR).
  • TIR total internal reflection
  • an optical beam-shaping element can be provided between the first light source and the cylindrical light guide. The beam-shaping element can be set up to convert the particular collimated light beam of the first light source into a divergent light beam with a suitable expansion and suitable beam profile, so that the divergent light beam propagates in the cylindrical light guide according to the law of total internal reflection (TIR).
  • a part of the lateral surface of the cylindrical light guide is formed as a coupling portion.
  • a coupling section according to the invention represents, in particular, a region of the lateral surface of the cylindrical optical waveguide in which light or at least one light beam is emitted or coupled out of the cylindrical optical waveguide.
  • the decoupled light can be coupled into a further, in particular flat, light guide.
  • the shape and dimension of the coupling section correspond in particular to the (desired) coupling-in surface of the further optical waveguide.
  • the coupling portion may be formed as an elongated surface.
  • the holographic-optical element has a lattice structure, such that light with a predetermined angular range emits from the cylindrical light guide, in particular in the arrangeable plate-shaped Fiber optic can be coupled.
  • the angle range relates in particular to an angle between the coupled-out light beam and the surface normal of the coupling surface of the plate-shaped light guide. In other words, the light leaves the cylindrical light guide with a predetermined angular range.
  • the illumination arrangement according to the invention provides a high-precision light expansion system in the form of a cylindrical light guide with a holographic-optical element.
  • the light expansion system is suitable for very flat and yet large BLUs.
  • Such lighting arrangements are easy to manufacture, mechanically robust and to different types of planar light guide or
  • the illumination arrangement according to the invention can be manufactured inexpensively, in particular using only a few compact light sources, and can generate a light beam that is very well collimated and thus usable for low-loss waveguiding, and that overall has low light losses.
  • Various novel compact, energy-efficient and powerful light sources such as LEDs and lasers, in particular diode lasers, can be used in a simple manner as the first light source for the illumination arrangement according to the invention.
  • the adaptation to different illumination geometries, in particular to different coupling-out angles, can be provided.
  • the holographic-optical element may have a lattice structure such that the light incident on the holographic-optical element is detected from the cylindrical light guide.
  • the detected light can then be deflected by the grating structure of the holographic-optical element such that the light leaves the cylindrical light guide in a spatial direction with an intensity angle distribution that substantially corresponds to the total reflection in the arrangeable plate-shaped light guide.
  • the main direction of the diffraction is in particular perpendicular to the main axis of the cylindrical light guide.
  • the shape and dimension of the coupling portion of the cylindrical light guide can be arbitrary.
  • the coupling portion may be a substantially parallel to the main axis of the be cylindrical light guide extending strip-shaped coupling surface.
  • the strip-shaped coupling section may have a holographic-optical element in the form of a strip-shaped film.
  • the maximum length of the strip-shaped coupling section can correspond in particular to an edge length of the plate-shaped optical waveguide.
  • the maximum width of the light guide preferably corresponds to the thickness of the plate-shaped light guide. It is understood that the dimensions of the strip-shaped coupling portion may also be smaller.
  • the holographic-optical element is formed from a self-adhesive material.
  • the self-adhesive holographic-optical element may be adhered to the coupling portion.
  • the bonding can take place exclusively by using the self-adhesive properties of the holographic-optical element.
  • the bonding can be performed while applying pressure.
  • a secure contacting of the self-adhesive holographic-optical element can also be achieved during operation.
  • the holographic-optical element directly without an additional layer the light can be deflected with very low losses.
  • the holographic-optical element may comprise at least one (additional) adhesion-promoting layer at least on one of its two lateral surfaces as an alternative or in addition to its self-adhesive property.
  • the holographic optical element may be attached to the coupling portion by means of the primer layer.
  • the holographic-optical element can be enclosed on both sides with an adhesion-promoting layer.
  • the holographic-optical element may further comprise on at least one side surface at least one thermoplastic film layer of a material selected from the group comprising polymethyl methacrylate (PMMA), cellulose triacetate (TAC), amorphous polyamides (PA), polycarbonate (PC), cycloolefin copolymers (COC). , Polyethylene (PE), polyethylene terephthalate (PET), polypropylene (PP) and polyvinyl alcohol (PVA).
  • PMMA polymethyl methacrylate
  • TAC cellulose triacetate
  • PA amorphous polyamides
  • PC polycarbonate
  • COC cycloolefin copolymers
  • PE Polyethylene
  • PET polyethylene terephthalate
  • PP polypropylene
  • PVA polyvinyl alcohol
  • the photopolymer may preferably be enclosed on both sides by a peelable substrate and a thin adhesion promoter layer. After bonding the photopolymer with the cylindrical light guide, the substrate can be removed from the photopolymer nondestructive and residue-free. Only the photopolymer and the primer layer remain in this case on the light guide.
  • the cylindrical light guide can have an arbitrary cross section.
  • the cylindrical light guide may have a rectangular, in particular square, or elliptical cross section.
  • the cylindrical light guide may have a circular cross-section. With a circular cross-section can achieve a particularly homogeneous light distribution in the cylindrical light guide.
  • the diameter of the cross section may be between 1 mm and 10 mm, preferably between 2 mm and 5 mm.
  • the strip-shaped film can be at least less than 20 °, preferably at least less than 10 °, particularly preferably at least less than 5 °, and most preferably 1 to 3 °, of the 360 ° circumferential surface of the lateral surface of the cylindrical light guide taking.
  • a particularly thin illumination arrangement can be provided.
  • the lighting arrangement may include the plate-shaped light guide.
  • the holographic-optical element may be optically coupled to at least one narrow side of the plate-shaped light guide, such that the light is coupled into the narrow side of the plate-shaped light guide. In particular, all decoupled light is coupled into the planar light guide.
  • the holographic-optical element can be optically coupled to at least one broad side of the plate-shaped light guide, such that the light is coupled into the broad side of the plate-shaped light guide. In particular, all decoupled light is coupled into the planar light guide. It is understood that two or more cylindrical light guides can be provided, which can be attached in a corresponding manner to the other narrow sides and / or broad sides of the plate-shaped light guide.
  • the optical coupling between the cylindrical light guide or the holographic optical element and the plate-shaped light guide can be made (almost) directly.
  • the holographic-optical element can be connected to one side directly or by means of an adhesion-promoting layer (and optionally further thermoplastic layer of the holographic-optical element) with the cylindrical light guide and / or the plate-shaped light guide.
  • a transparent coupling substrate may be arranged between the holographic-optical element and the plate-shaped light guide. Common materials are glass or plastic for the optically transparent substrate.
  • a coupling substrate improves the mechanical properties of the lighting assembly.
  • the cylindrical light guide can be formed from a material selected from the group glass, polymethyl methacrylate, polydimethylsiloxane, polycarbonate or polystyrene.
  • the plate-shaped light guide can also be formed from a material selected from the group glass, polymethyl methacrylate, polydimethylsiloxane, polycarbonate or polystyrene.
  • An optical fiber may also be formed from other amorphous thermoplastics or mixtures of such materials.
  • Corresponding optical waveguide materials are characterized in that a homogeneous, non-scattering, and transparent transparent to the wavelengths of the light source can be formed from them. The light can propagate in a corresponding optical waveguide material in different beam paths, also called wave modes (short form: modes).
  • At least one of the two ends or end faces of the cylindrical light guide is configured to couple or introduce light from a first light source into the cylindrical light guide.
  • the further end of the cylindrical light guide may be formed reflecting.
  • the other end may be mirrored.
  • One (unwanted) Light emission can be avoided and therefore a good light efficiency of the lighting arrangement can be provided.
  • the invention proposes to set up the further end of the cylindrical light guide such that light from a second light source can be coupled into the cylindrical light guide. The available output light power can be increased.
  • the holographic-optical element may be formed from a material selected from the group of silver halide emulsions, dichromated gelatin or photopolymers.
  • the photopolymers can be formed at least from photoinitiator systems and polymerizable writing monomers.
  • the photopolymers may comprise plasticizers and / or thermoplastic binders and / or crosslinked matrix polymers.
  • the photopolymers are formed from a photoinitiator system, one or more random monomers, plasticizers and crosslinked matrix polymers.
  • the illumination arrangement may preferably have at least one first light source.
  • This light source may be a laser module or a light-emitting diode module, in particular a high-power light-emitting diode module.
  • the laser module can, for example, be an RGB
  • the RGB laser module can emit three colors of monochromatic light (e.g., red, green, and blue).
  • a high-performance light-emitting diode module for example, a white high-performance light-emitting diode (English: Power LED) can be used with primary optics.
  • the primary optic includes e.g. a potting compound for the LED chip with its substrate and its terminals, and a downstream optical element, such as a converging lens or a parabolic reflector.
  • the primary optics cause the collimation of the white light emitted from the chip over a wide solid angle.
  • a beam shaping module may be arranged, in particular for converting a collimated light beam into a divergent light beam such that the light entering the cylindrical light guide is subject to total reflection in the cylindrical light guide.
  • the cylindrical light guide and / or the plate-shaped light guide can be produced by casting, injection molding and / or mechanical machining.
  • An appropriate one Optical fiber can be easily manufactured.
  • the entire lighting arrangement is to be produced in a simple and cost-effective manner if (in addition) a strip-shaped holographic-optical film is glued on a manufactured optical waveguide in the manner previously described.
  • a further aspect of the invention is a method for producing an illumination arrangement for indirect illumination according to claim 13.
  • the illumination arrangement produced by the method is in particular a lighting arrangement described above.
  • the method comprises providing a cylindrical optical waveguide, wherein at least one end of the cylindrical optical waveguide is adapted to couple light from a first light source into the cylindrical optical waveguide, and wherein the lateral surface of the cylindrical optical waveguide has a coupling section configured for optically coupling the cylindrical waveguide with an arrangeable plate-shaped waveguide Having optical fiber.
  • the method further comprises that at least one holographic-optical element arranged to emit at the coupling section
  • Light from the cylindrical light guide is mounted in the arrangeable plate-shaped light guide.
  • a lighting arrangement By attaching, in particular gluing, a holographic-optical element to the light guide, a lighting arrangement can be produced in a simple manner in which light is coupled out of the cylindrical light guide in a defined, targeted and homogeneous manner.
  • Yet another aspect of the invention is a screen, in particular a flat screen, comprising at least one lighting arrangement described above.
  • the illumination arrangement according to the invention can be at least as part of a backlight unit of a screen.
  • the screen may be an LCD screen.
  • a lighting system in particular a motor vehicle lamp comprising at least one lighting arrangement described above.
  • the lighting system can be a surface lighting system, for example, for the interior of a building or motor vehicle or for the ambient lighting of a motor vehicle or for the outer functional lights of a motor vehicle.
  • the lighting arrangement can be used in a motor vehicle headlight, for example, for a so-called daytime running light.
  • Figure 1 is a schematic representation of a first embodiment of a
  • Figure 2 is a schematic representation of another embodiment of a
  • Figure 3 is a schematic representation of an embodiment of a
  • FIGS. 4a-c are schematic representations of embodiments of
  • Figure 5 is a schematic representation of another embodiment of a
  • Figure 6 is a schematic representation of another embodiment of a
  • Figure 7 is a schematic representation of another embodiment of a
  • Figure 8 is a schematic representation of another embodiment of a
  • Figure 9 is a schematic representation of an embodiment of a
  • Figure 10 is a schematic representation of an embodiment of a
  • FIG. 11 is a schematic representation of an embodiment of a
  • Figure 12 is a schematic representation of an embodiment of a
  • Figure 13 is a schematic representation of an embodiment of a
  • Lighting arrangement according to the invention with exemplary exemplary light beam path
  • FIG. 1 shows a first exemplary embodiment of a lighting arrangement 2 according to the present invention.
  • the lighting arrangement 2 comprises a cylindrical light guide 4.
  • the present cylindrical light guide 4 has two ends 12.1, 12.2 or end faces 12.1, 12.2 and a lateral surface 10.
  • the cylindrical light guide 4 also has a circular cross-section. It is understood that according to other variants of the invention, the cylindrical light guide may also have a different shape and, for example, may have a rectangular or elliptical cross-section.
  • the cylindrical light guide 4 has a coupling section 6.
  • the coupling section 6 is formed in the present embodiment by a holographic optical element 8.
  • a holographic-optical film 8 may be adhered to the lateral surface 10 of the cylindrical optical waveguide 4.
  • the holographic-optical element 8 is adapted to decouple light, which has been coupled in via one of the end surfaces 12.1, 12.2 and propagates in the direction of the main axis 14 of the light guide 4, from the cylindrical light guide 4 in a defined manner, as will be described in detail below.
  • the illustrated illumination arrangement 2 can be used in particular as a compact beam expander and area radiator with a defined emission characteristic in a backlight unit for flat screens.
  • FIG. 2 shows a further embodiment of an inventive device
  • Lighting arrangement 2.1 comprises initially The above-described cylindrical optical fiber rod 4 having a coupling portion 6 formed by a holographic-optical element 8.
  • the coupling portion 6 is formed strip-shaped and parallel to the main axis 14 from one to the other end 12.1, 12.2 of the cylindrical optical fiber 4.
  • Light is formed in a planar waveguide (not shown in FIG. 2) or planar waveguide.
  • the illumination arrangement 2.1 in the present case comprises a first light source 1, a beam-shaping module 5 and a substrate 7.
  • the first light source 1 may be a laser module 1.
  • an RGB laser module may be provided which emits three colors of monochromatic light, such as red, green and blue.
  • the first light source 1 has a white one
  • the optics may e.g. a potting compound for the LED chip with its substrate and its terminals, and downstream optical element, such as a converging lens or a parabolic reflector include.
  • the optics effects the collimation of the white light emitted from the chip over a wide solid angle.
  • FIG. 3 shows a possible embodiment of the light source 1 based on power LED.
  • a power LED (white) 205 emits white light, which is collimated by a plano-convex lens 206 and a field stop 207. Between the first light source 1 and the first end 12.1 of the cylindrical lens 206 and a field stop 207.
  • Optical fiber 4 is located in the illumination arrangement 2.1 an optical beam shaping module 5.
  • the beam shaping module 5 is adapted to transform the collimated light beam of the first light source, as shown in Figure 3, into a divergent beam with a suitable expansion and suitable beam profile.
  • the beam-shaping module 5 is set up in such a way that the generated light beam or the generated light propagates in the cylindrical light guide 4 via the first end 12. 1 into the cylindrical light guide 4 according to the law of total internal reflection (TIR).
  • TIR total internal reflection
  • Beam shaping module 5 may be formed by a biconvex lens 201.
  • the exact one Embodiment of this coupling lens 201, in particular with respect to diameter, focal length and distance to the edge 12.1 of the light guide 4 is determined by the embodiment of the light guide 4, in particular its Kanten vomgeometrie and the refractive index (refraction and reflection at the edge of the light guide 4 are not sake of simplification shown separately). The interpretation is preferably carried out in
  • Extension of the beam diameter in front of the coupling lens and at least one mode filter 204 include.
  • the mode filter 204 built in between two lenses controls the intensity of the light incident on the coupling lens and fixes the beam profile.
  • Amplitude and phase spatial light filters (SLM) can be provided which take on this optical function.
  • SLM spatial light filters
  • the mode filter 204 is a filter ring, so that it can produce in conjunction with the lenses of the beam shaping module 203, a spherical wave with annular beam profile.
  • the cylindrical light guide 4 of the illumination arrangement 2.1 according to the invention may preferably be formed from glass, polymethylmethacrylate (PMMA), polydimethylsiloxane (PDMS), polycarbonate (PC), polystyrene (PS), or other amorphous thermoplastics or mixtures of such substances, which have the following requirements meet for fiber optic materials.
  • the cylindrical light guide 4 is in particular a homogeneous, non-scattering and transparent to the wavelengths of the first light source 1 solid.
  • the light can propagate in the cylindrical light guide 4 in different beam paths, also called wave modes (short form: modes). (Almost) all modes except the axial mode where the light travels along the central axis 14 of the cylindrical optical fiber 4 are characterized by total internal reflection at the interface to the surrounding medium (here air).
  • the cylindrical light guide 4 moreover preferably has low scattering losses and absorption losses.
  • the cylindrical light guide 4 has smooth, non-scattering surfaces.
  • the cylindrical light guide 4 is in particular formed such that the light power loss when passing through the entire length of the light guide 4 is less than 10% or 0.46 dB, more preferably less than 5% or 0.22 dB.
  • the optical waveguide material of the cylindrical optical waveguide 4 can preferably be at high
  • plastics can be mass polymerized.
  • the optical waveguide material of the cylindrical optical waveguide 4 is selected in particular such that it has a constant density and good optical isotropy.
  • Refractive index in the material volume in all three spatial dimensions of the optical fiber rod 4 varies in particular by not more than 0.02, preferably not more than 0.01, and more preferably not more than 0.005.
  • the cylindrical light guide 4 corresponds to a light guide rod, with a length greater than or equal to the edge length of an attachable (not shown in Figure 2) light guide plate.
  • the illustrated light guide 4 has a circular cross-section.
  • the diameter is in particular 1 to 10 mm, preferably 1 to 5 mm.
  • the light guide rod 4 is mirrored in one embodiment on the other end face 12.2, which is not used for the light coupling. A light emission in the sense of a good light efficiency of the lighting arrangement 2.1 can be avoided.
  • the cylindrical light guide 4 may have, in addition to a first light source, a second light source at the second end 12.2. Light can propagate from two opposite directions through the fiber optic rod 4. These Embodiment is preferred for BLU applications, which have particularly high demands on the available output light power.
  • the holographic-optical element 8 is formed of a recording material for volume holograms. Into the recording material, certain light-diffracting transmission-type grating structures have been introduced by holographic exposure. The grating structures are chosen so that a defined coupling or emission of light can take place from the cylindrical light guide. Preferred materials are holographic silver halide emulsions, dichromated gelatins or photopolymers. Photopolymers may preferably be formed from at least photoinitiator systems and polymerizable random monomers. Special photopolymers may additionally contain plasticizers, thermoplastic binders and / or crosslinked matrix polymers. Preference is given to photopolymers containing crosslinked matrix polymers. It is particularly preferred if the photopolymers from a
  • Photoinitiator system one or more writing monomers, plasticizers and crosslinked matrix polymers are formed.
  • the holographic-optical element 8 is coupled to the cylindrical light guide 4.
  • the attachment of the holographic-optical element 8 results in a coupling section 6, in particular in the form of a thin contact line on the surface or lateral surface 10 of the cylindrical optical waveguide 4.
  • the strip-shaped coupling section 6 extends in particular parallel to the main axis of the cylindrical optical waveguide 4. In other words the coupling portion 6 in the propagation direction of the light in the cylindrical optical fiber 4.
  • the holographic-optical element 8 acts in particular diffractive in transmission through its volume grating within the holographically active surface.
  • the active area is part of the flat holographic recording material.
  • the active area may occupy part or the whole area of the holographic recording material.
  • the active surface comprises at least the contact surface to the cylindrical light guide
  • the active surface is flat or curved in one direction. The latter is the case when the holographic-optical element 8 rests on the cylindrical light guide 4 with at least the active part of its surface.
  • the holographic-optical element 8 is designed such that incident light is detected in an angle-selective manner. The detected light is then from the holographic-optical Element 8 or the implemented grating structures deflected so that it leaves the cylindrical light guide 4 in a spatial direction with a narrow intensity-angle distribution, which is subject to the total reflection in the surface-coupling light guide plate.
  • the main direction of the diffraction is perpendicular to the main axis of the cylindrical light guide 4. A homogeneous light curtain occurs over the entire length of the
  • Coupling section 6 away from the cylindrical light guide 4 from.
  • the light curtain generated by the illumination arrangement 2.1 according to the invention is particularly well collimated. Propagation losses in a optically coupled light guide plate are so low that the light pipe is possible over long distances.
  • the efficiency of the holographic-optical element 8 along the propagation direction of the light in the cylindrical light guide 4 may be adapted to the local intensity of all propagating modes.
  • the correspondingly generated light curtain has an (almost) constant along the coupling surface or line 6
  • Evanescent waves appear behind the surface where waves are totally reflected.
  • the amplitude of the wave drops steeply with a 1 / e function behind the surface.
  • Penetration depth of the wave in the holographic medium, which adjoins said surface depends on several parameters, such as the wavelength of the light, the reflection angle and the refractive index of the medium. It is, for example, between 1 and 3 ⁇ . This small penetration depth is sufficient for the shaft to interact with the holographic-optical element 8, so that the condition for diffraction at the holographic grating in the holographic-optical element 8 is provided.
  • the holographic-optical element 8 may be (additionally) connected to a (coupling) substrate 7, as shown by way of example in FIG.
  • Preferred structures are an optically transparent substrate 7 made of glass or plastic and a photopolymer.
  • the substrate 7 gives the photopolymer the necessary mechanical stability.
  • the holographic-optical element 8 such that the photopolymer of a thermoplastic film and a thin adhesion promoter layer is preferably bordered on both sides.
  • the adhesion promoter layer can be formed from an optically clear adhesive film. In this case, it is preferable that the photopolymer having the adhesion promoter side is attached to the cylindrical optical fiber 4.
  • thermoplastic film layers of the holographic-optical element 8 may be formed of transparent plastics. Preference is given to using largely birefringence-free materials, such as amorphous thermoplastics. Particularly suitable are polymethyl methacrylate (PMMA), cellulose triacetate (TAC), amorphous thermoplastics.
  • PMMA polymethyl methacrylate
  • TAC cellulose triacetate
  • PA Polyamides
  • PC polycarbonate
  • COC cycloolefin copolymers
  • the holographic-optical element 8 may be performed as a transfer film.
  • the photopolymer may be enclosed on both sides by a peelable substrate and a thin adhesion promoter layer. After bonding the
  • the substrate can be removed from the photopolymer non-destructive and residue-free. As a result, only the photopolymer comprising the holographic-optical element 8 and the primer layer remains on the cylindrical optical fiber 4.
  • the contact surface between the holographic-optical element 8 and the cylindrical light guide 4 may be limited to a (thin) line occupying only a portion of the lateral surface of the optical fiber 4.
  • the coupling portion may occupy less than 20 °, preferably less than 10 °, more preferably less than 5 °, and most preferably 1-3 °.
  • FIGS. 5 to 8 show further exemplary embodiments of lighting arrangements 2.2 to 2.5 according to the invention.
  • the illumination arrangements 2.2 to 2.5 shown have in common that all illumination arrangements 2.2 to 2.5 have a plate-shaped light guide 16 optically coupled to at least one cylindrical light guide 4.
  • the plate-shaped light guide 16 has four narrow sides 18, 20.
  • the plate-shaped light guide 16 has two broad sides 22, 24.
  • the planar light guide 16 has a rectangular bottom side 24 and a rectangular top side 22.
  • the illumination arrangement 2.2 has, in addition to the planar light guide 16, the components 1 to 8 already described.
  • the light coupled out of the cylindrical light guide 4 by means of the holographic-optical element 8 is coupled into the planar light guide 16 at one of the two shorter narrow sides.
  • a first embodiment a
  • the light curtain enters the light guide plate 16 through the edge 18 in accordance with the illumination arrangement 2.2.
  • the length of the cylindrical light guide 4 is presently chosen so that the coupling portion 6 extends with the holographic-optical element 8 over the entire length of the edge 18 of the planar light guide 16.
  • the lighting arrangement 2.3 shown in FIG. 6 differs from the lighting arrangement 2.2 described above, in particular in that two cylindrical lighting arrangements
  • Light guide 4 are provided.
  • light can be coupled into the planar light guide 16 on two opposite narrow sides 18.
  • the coupling of the light can also take place via at least one of the longer narrow sides 20 and / or by using an additional substrate.
  • the coupling of light from two, three or four cylindrical light guides 4 according to the invention can take place via arbitrarily selected edges 18, 20.
  • FIGS. 7 and 8 show exemplary embodiments in which the light from one or two cylindrical optical waveguides / n 4 is coupled into the planar light guide 16 on a broad side 24.
  • the light is coupled in an edge region of the broad side 24.
  • the cylindrical light guide 4 runs parallel to the narrow side 18.
  • the light curtain preferably enters the plate-shaped light guide 16 via the rear surface 24.
  • the front surface 22 is defined in particular as the surface over which the light exit from the plate-shaped light guide 16 in the direction of a (not shown) LC panel.
  • FIG. 8 shows a further exemplary embodiment with two cylindrical light guides 4 according to the invention.
  • the two cylindrical light guides 4 are arranged on the opposite edge regions of the broad side 24. In particular, both light guides 4 run parallel to one another and parallel to the respective narrow sides 18.
  • the coupling of light from two or more cylindrical light guides 4 according to the invention can take place via arbitrarily selected positions. Positions further in the center of the plate are also possible. Furthermore, the embodiments in FIGS. 7 and 8 differ from those of FIGS.
  • the coupling of the light can also take place over at least one width side parallel to one of the longer narrow sides 20 and / or without the use of an additional substrate 7.
  • Light guide 4 is coupled, preferably comprises elements for coupling the light.
  • the planar light guide 16 may include printed patterns of white paint, roughened surfaces, embossed refractive structures, and / or holographic-optical coupling-out elements.
  • the ideal type, number or density of these structures can be chosen freely within wide ranges, so that the light distribution is adapted to the specification of the BLU, for example.
  • the aim of BLUs for 2D displays is, in particular, a fairly homogeneous illumination of the panel. In some autostereoscopic SD display technologies, the goal may be homogeneous radiation with a preferred direction.
  • the illumination arrangements according to the invention produce a very precisely defined spatial intensity distribution and propagation directions, and thus high steel quality from the coupling surface, which make it possible to construct very flat-structured light guide plates and mode waveguides in various, in particular large-area embodiments, which have a low-loss waveguide, so that mechanically robust BLUs with high light efficiency and low technical complexity, are feasible.
  • FIGS. 9 to 13 show various exemplary embodiments of illumination arrangements with light beam profiles drawn in.
  • Preferred design forms of the hologram in particular its trigonometric functions and spectral widths, which determine both the light extraction from the optical waveguide 4 according to the invention and the light coupling into the planar light waveguide 16, are described below.
  • the hologram is designed as a transmission hologram, so that it reconstructs light that propagates in the xz plane in the light guide rod under total reflection, ie deflects diffractively at the gratings.
  • the reconstruction angle 9 from FIG. 9 should also be called the azimuth angle 6 R or Theta R.
  • Theta R is defined as the angle of incidence of the light under which the
  • the preferred angular range of Theta R is between the critical angle for total reflection and 85 °, more preferably between the critical angle for total reflection and 80 °.
  • the hologram shows a narrower to further spectral acceptance.
  • a sufficient spectral width of the hologram is desirable, which ideally includes the emission spectrum of the light source.
  • the preferred selected layer thickness of the hologram in the case of LED illumination is 0.5 to 30 nm with a preferred refractive index modulation of 0.025 to 0.060.
  • the layer thickness is particularly preferably from 1 to 17 nm, very particularly preferably from 1 to 6 nm.
  • the refractive index modulation over the holographic exposure time and / or exposure intensity is adjusted such that overmodulation of the gratings is avoided, so that a high, ideally close to 100%, diffraction efficiency is achieved.
  • the diffraction efficiency is determined over the length of the active hologram surface, i. over the length of the coupling surface, set in the form of a gradient, with the aim of improving the homogeneity of the signal beam along the coupling surface (x-direction).
  • RGB red-green-blue
  • the grids are preferably multiplexed in a holographic film, especially in a photopolymer film, i. written over each other.
  • the production of multiplexed holograms takes place, for example, over simultaneous, individual time-sequential or over individual temporally overlapping exposures.
  • a plurality of holograms are superimposed in individual films.
  • the exposure of the individual holograms is typically carried out in individual exposure steps with different recording films. These individual films are e.g. produced by cold or hot lamination or bonding of films in multiple layers.
  • a plurality of holographic grids for the decoupling of the light.
  • One or a set of holograms diffracts the light from a preferred light source assigned to it. In total, the number of holograms doubled by the second light source.
  • Holograms in a film are freely combinable so that a desired compromise between ease of production and hologram efficiencies can be found.
  • the hologram is designed as a transmission hologram, so that light that is in the xz
  • the reconstruction angle ⁇ R (azimuth angle Theta R), defined as the angle of incidence of the light under which the diffraction efficiency of the hologram reaches its maximum, overlaps with the angular distribution (also with respect to the azimuth angle) of the rays reaching the hologram's contact surface.
  • the allowed angular range of 6 R is defined as follows: ⁇ 3, ⁇ ⁇ 5 ⁇ 9 ⁇ where e 3 crit is the critical angle in the light guide 4.
  • the preferred angular range of 6 R is between 6 3 crit + 5 ° and 85 °, and more preferably between 6 3 crit + 10 ° and 80 °.
  • the signal beam 17 indicates the direction of the light deflected by diffraction at the grating. Its direction vector lies in the yz plane, see FIGS. 10 to 13.
  • the term "out-of-plane" holograms is used because the said diffraction direction lies outside the plane of the reconstruction beam 13 (xz plane according to FIG. 9).
  • the deflection angle 21 occupied by the yz-plane signal beam is hereinafter referred to as 6 S (azimuth angle Theta S) and the critical angle of light propagation under total reflection in the light guide 16 as 6 crit .
  • 6 S azimuth angle Theta S
  • 6 crit the critical angle of light propagation under total reflection in the light guide 16
  • the permissible angular range of 6 S in the case of the rear-side coupling through the substrate, see FIG. 10, is defined as follows:
  • the condition changes as follows:
  • the preferred angular range of ⁇ 5 is 5 ° each, and more preferably 10 ° away from the limits defined herein.
  • the hologram fans out the signal beam in the yz plane, so that an angular distribution in the context of the o.g. allowed or preferred angular range is present.
  • the signal beam does not lie in the yz plane, but deviates from it by a given angle.
  • the hologram fans out the signal beam in the xy plane.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Diffracting Gratings Or Hologram Optical Elements (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un dispositif d'éclairage indirect (2, 2.1, 2.2, 2.3, 2.4, 2.5) qui comprend au moins un guide de lumière cylindrique (4). Au moins une extrémité (12.1, 12.2) du guide de lumière cylindrique (4) est adaptée pour injecter de la lumière, provenant d'une première source de lumière (1), dans le guide de lumière cylindrique (4) et la surface d'enveloppe (10) du guide de lumière cylindrique (4) comprend une section de couplage (6) adaptée pour coupler optiquement le guide de lumière cylindrique (4) à un guide de lumière (16) en forme de plaque pouvant être disposé. Au moins la section de couplage (6) comprend au moins un élément optique holographique (8) adapté pour émettre de la lumière, provenant du guide de lumière cylindrique (4), dans le guide de lumière (16) en forme de plaque pouvant être disposé.
EP16731175.2A 2015-06-26 2016-06-23 Dispositif d'éclairage indirect et procédé de fabrication d'un dispositif d'éclairage indirect Withdrawn EP3314164A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP15174074 2015-06-26
PCT/EP2016/064564 WO2016207294A1 (fr) 2015-06-26 2016-06-23 Dispositif d'éclairage indirect et procédé de fabrication d'un dispositif d'éclairage indirect

Publications (1)

Publication Number Publication Date
EP3314164A1 true EP3314164A1 (fr) 2018-05-02

Family

ID=53502483

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16731175.2A Withdrawn EP3314164A1 (fr) 2015-06-26 2016-06-23 Dispositif d'éclairage indirect et procédé de fabrication d'un dispositif d'éclairage indirect

Country Status (6)

Country Link
US (1) US10444420B2 (fr)
EP (1) EP3314164A1 (fr)
JP (1) JP2018527694A (fr)
KR (1) KR20180020163A (fr)
CN (1) CN107810364A (fr)
WO (1) WO2016207294A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ2018131A3 (cs) * 2018-03-15 2019-09-25 Varroc Lighting Systems, s.r.o. Světlovodný systém, zejména pro osvětlení pozemních dopravních prostředků
US11884202B2 (en) 2019-01-18 2024-01-30 Kyocera Sld Laser, Inc. Laser-based fiber-coupled white light system
US20210278584A1 (en) * 2019-01-18 2021-09-09 Kyocera Sld Laser, Inc. Edge coupled fiber light
DE102020101813A1 (de) * 2019-01-29 2020-07-30 Schott Ag Linienleuchte
DE102020109338B3 (de) 2020-04-03 2021-05-27 Webasto SE Fahrzeugscheibe mit Lichtquelle und Lichtleiterschicht
DE102022115618A1 (de) * 2022-06-23 2023-12-28 Bayerische Motoren Werke Aktiengesellschaft Beleuchtungsanordnung, Fahrzeugleuchte und Fahrzeug

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5506929A (en) 1994-10-19 1996-04-09 Clio Technologies, Inc. Light expanding system for producing a linear or planar light beam from a point-like light source
JPH11295713A (ja) * 1998-04-16 1999-10-29 Hitachi Ltd 液晶表示装置
JP2001035230A (ja) * 1999-07-26 2001-02-09 Minebea Co Ltd 面状照明装置
US7263268B2 (en) * 2001-07-23 2007-08-28 Ben-Zion Inditsky Ultra thin radiation management and distribution systems with hybrid optical waveguide
US7255469B2 (en) * 2004-06-30 2007-08-14 3M Innovative Properties Company Phosphor based illumination system having a light guide and an interference reflector
US7549783B2 (en) 2005-04-18 2009-06-23 Energy Focus, Inc. Efficient luminaire with directional side-light extraction
JP4468235B2 (ja) * 2005-05-13 2010-05-26 株式会社クラレ 面光源素子およびそれを用いた表示装置
EP1922580B1 (fr) * 2005-09-07 2009-11-04 BAE Systems PLC Affichage par projection avec un guide d'onde transversal rectangulaire en forme de tige et un guide d'onde en forme de plaque, chacun ayant un réseau de diffraction
FR2891891B1 (fr) * 2005-10-11 2013-08-30 Valeo Vision Dispositif d'eclairage ou de signalisation a guide optique pour vehicule automobile
US7872705B2 (en) 2007-07-29 2011-01-18 Cree, Inc. LED backlight system for LCD displays
WO2009127849A1 (fr) * 2008-04-14 2009-10-22 Bae Systems Plc Améliorations de guides d’ondes ou relatives à des guides d’ondes
TW201007288A (en) * 2008-08-11 2010-02-16 Advanced Optoelectronic Tech Edge lighting back light unit
JP2010103034A (ja) * 2008-10-27 2010-05-06 Ushio Inc 線状光源装置
JP6251741B2 (ja) * 2012-08-13 2017-12-20 コベストロ、ドイチュラント、アクチエンゲゼルシャフトＣｏｖｅｓｔｒｏ Ｄｅｕｔｓｃｈｌａｎｄ Ａｇ 液晶ディスプレイ用照明装置

Also Published As

Publication number Publication date
JP2018527694A (ja) 2018-09-20
US20180188437A1 (en) 2018-07-05
CN107810364A (zh) 2018-03-16
US10444420B2 (en) 2019-10-15
WO2016207294A1 (fr) 2016-12-29
KR20180020163A (ko) 2018-02-27

Similar Documents

Publication Publication Date Title
EP3314164A1 (fr) Dispositif d'éclairage indirect et procédé de fabrication d'un dispositif d'éclairage indirect
EP2883091B1 (fr) Dispositif d'éclairage pour un affichage à cristaux liquides
DE102012100209B4 (de) Beleuchtungsvorrichtung für ein Display oder für ein stereoskopisches 3D-Display oder für ein holographisches 3D-Display und Display mit einer Beleuchtungsvorrichtung
DE102017123669A1 (de) Leuchtvorrichtung
DE102011089575B3 (de) Beleuchtungseinrichtung für ein Kraftfahrzeug mit einem gestuften Lichtleiter
DE102006056150A1 (de) Vorrichtung zur Abstrahlung elektromagnetischer Strahlung und Anzeigevorrichtung
EP2587125A2 (fr) Module de projection de phare pour un véhicule automobile
DE102009011908A1 (de) Head-up-Display und Fahrzeug
EP1141623B1 (fr) Source lumineuse a couplage lateral oblique de lumiere
DE102012224079A1 (de) Lichtleiter mit einer bandförmigen Lichtaustrittsfläche
EP1110031B1 (fr) Lampe dotee d'un guide de lumiere
DE102012005826A1 (de) Optikelement für eine Fahrzeugleuchte
DE102009017424B4 (de) Vorsatzoptik für eine Lichtquelle und Beleuchtungseinrichtung für ein Kraftfahrzeug mit einer solchen Vorsatzoptik
WO2020038790A1 (fr) Dispositif de guidage de lumière et dispositif d'éclairage pourvu d'un dispositif de guidage de lumière
DE102013007856A1 (de) Lichtleitkörper und Leuchtvorrichtung mit dem Lichtleitkörper
DE102013103539B4 (de) Holografische Folie und Verfahren zur Herstellung derselben sowie Beleuchtungseinrichung und Hinterleuchtungseinrichtung
WO2006027304A1 (fr) Dispositif d'eclairage destine au retroeclairage uniforme d'ecrans plats, comportant un conducteur optique pourvu d'elements de surface diffractifs
DE102009028984B4 (de) Beleuchtungseinheit für ein Direktsichtdisplay
DE102019206025A1 (de) Holografisches Anzeigeelement, Vorrichtung zur Anzeige holografischer Darstellungen, Verfahren zur Herstellung eines holografisch optischen Elements sowie Verwendung eines holografischen Anzeigeelements
DE102010051597A1 (de) Optisches Linsenelement, Lichtmodul für einen Kraftfahrzeugscheinwerfer mit einem solchen Linsenelement und Kraftfahrzeugscheinwerfer mit einem solchen Lichtmodul
WO2023285619A1 (fr) Dispositif d'éclairage holographique
DE102012100206A1 (de) Optische Vorrichtung zum Beleuchten einer Pixelmatrix oder eines steuerbaren räumlichen Lichtmodulators eines Displays
EP1085252B1 (fr) Luminaire à guide de lumière avec écran amélioré
EP1635201A1 (fr) Dispositif d'illumination ayant un guide optique à éléments de surface diffractifs pour l'éclairage uniforme d'un afficheur plan
WO2023160956A1 (fr) Guide d'ondes pour l'affichage d'une image et dispositif d'affichage holographique comportant ce guide d'ondes

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20180126

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

AX Request for extension of the european patent

Extension state: BA ME

DAV Request for validation of the european patent (deleted)
DAX Request for extension of the european patent (deleted)
17Q First examination report despatched

Effective date: 20200327

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20201007