WO2012059855A1 - Feuille électroluminescente - Google Patents

Feuille électroluminescente Download PDF

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Publication number
WO2012059855A1
WO2012059855A1 PCT/IB2011/054827 IB2011054827W WO2012059855A1 WO 2012059855 A1 WO2012059855 A1 WO 2012059855A1 IB 2011054827 W IB2011054827 W IB 2011054827W WO 2012059855 A1 WO2012059855 A1 WO 2012059855A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
sheet
sticker
guiding material
coupling structures
Prior art date
Application number
PCT/IB2011/054827
Other languages
English (en)
Inventor
Maarten Marinus Johannes Wilhelmus Van Herpen
Oscar Hendrikus Willemsen
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2012059855A1 publication Critical patent/WO2012059855A1/fr

Links

Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/18—Edge-illuminated signs
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0409—Arrangements for homogeneous illumination of the display surface, e.g. using a layer having a non-uniform transparency
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0058—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide
    • G02B6/0061—Means for improving the coupling-out of light from the light guide varying in density, size, shape or depth along the light guide to provide homogeneous light output intensity
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0066—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • the present invention relates to a light emitting sheet, for example using LED light sources.
  • LEDs light emitting diodes
  • LEDs are made by connecting the n-type semiconductor region and the p-type semiconductor region of an LED chip to respective terminal pins for drawing electric current.
  • the LED chip is embedded in a package, for example of a resin.
  • the package may be arranged so that light from the LED chip is emitted in one or more designated directions.
  • LEDs have a small form factor, which enables thin and versatile designs to be formed.
  • One example is a light emitting sheet which can be placed over, or integrated with a surface.
  • a light emitting sheet is for example provided with an embedded LED or an array of embedded LEDs. The LEDs emit light at their locations within the sheet.
  • the small form factor of the LEDs translates to very high brightness, for example exceeding 10 6 cd/m 2 .
  • a problem with light emitting sheets with integrated arrays of LEDs is that the sheet has local high intensity regions at the LEDs.
  • the individual LEDs can create glare as well as unwanted shadowing effects.
  • it is desired to obtain a more uniform light output intensity across the area of the sheet for example spreading the LED light output over a larger area of for example 1 to 10cm .
  • Secondary optics such as light diffusing layers or scattering surfaces can be used for this purpose.
  • a light emitting sheet uses a light cavity to spread light and thereby generate a more uniform output.
  • Light cavities are for example used in backlight units for LCDs, where the uniformity of the output is of particular importance.
  • a cavity can be in the form of a foil, which is illuminated by edge-mounted LEDs.
  • a PMMA Poly(methyl methacrylate) - a transparent thermoplastic
  • Light is captured within the waveguide by total internal reflection, and light out-coupling structures are used to generate the uniform illumination at the light output surface. These light out-coupling structures provide a change in refractive index or a change in the angle of the light, such as to interrupt the total internal reflection.
  • the out-coupling areas are arranged with reference to the LED positions - for example closer together further away from the LEDs, because the intensity is lower, so that more light output areas are needed for a uniform intensity over the area of the light output surface.
  • Figure 1 shows a PMMA waveguide light emitting sheet, and shows edge coupled LEDs 10 (for example red, green and blue), the waveguide 12 and the irregular pattern of light out-coupling structures 14.
  • the pattern is calculated precisely to ensure a good uniformity.
  • the waveguide is for example 1mm thick.
  • Figure 2 shows the structure of Figure 1 in cross section.
  • the light out-coupling structures can take various forms, such as scattering paint dots, micro-grooves, micro-prisms, microlenses, domains with surface roughness, phosphor dots.
  • transmissive emissive window which is transparent and therefore can form part of (or be provided over) a window, but is also emissive and can therefore be used for lighting.
  • the light skin is thus used as a glazing material (generally over a substrate such as glass).
  • the invention is directed to the problem of making a low-cost general lighting system in the form of a sheet, with a cut-to-measure architecture.
  • a light guide can provide a low-cost way to distribute the light from LEDs, but the challenge then becomes how to make the light guide cut-to-measure.
  • a lighting system comprising: a light guide comprising a sheet of light guiding material;
  • an array of light out-coupling structures for mounting at a surface of the sheet of light guiding material; and at least one LED module for mounting at an edge of the sheet of light guiding material for directing light into the sheet,
  • array of light out-coupling structures comprise a sticker for application to the sheet.
  • the sheet of light guiding material can be a generic sheet with no special design for the light out-coupling structures.
  • the sheet of light guiding material can comprise PMMA, polycarbonate or glass, for example.
  • the light out-coupling structures can be arranged in a more dense pattern near the centre of the sticker than near the edge of the sticker. For an edge-lit system, this increases the illumination area at greater distance from light source, and aims to ensure that the light coupled out from the surface has a substantially uniform light intensity distribution.
  • the light out-coupling structures can be arranged in a pattern which is mirror symmetric about at least one axis passing through the centre of the sticker. With the sticker central axis aligned with the central axis of the sheet, if there is edge lighting from opposite edges, this provides a uniform light output.
  • the sticker Before the lighting system is assembled, the sticker can be larger than the sheet of light guiding material and has at least one axis of mirror symmetry (of the light out- coupling structures) passing through its centre, and the sticker is for cutting in a way that maintains the centre. In other words, when cutting the sticker down to size, the central axis of symmetry of the light out-coupling structures is maintained in the centre. This means the applied sticker is symmetric with respect to the sheet.
  • the sticker comprises a first sticker part and a second sticker part which together are larger than the sheet of light guiding material, and the sticker parts are for cutting in a way that maintains one edge intact.
  • the intact edges of the two sticker parts can then be abutted to form the central sticker axis. This gives an easier cutting operation.
  • the sticker When assembled, the sticker is mounted at the surface of the sheet of light guiding material and the LED module is mounted at an edge of the sheet of light guiding material for directing light into the sheet.
  • the invention also provides a method of configuring a lighting system, comprising:
  • Figure 1 shows a know light emitting sheet in perspective view
  • Figure 2 shows the light emitting sheet of Figure 1 in cross section
  • Figure 3 shows an example of lighting system of the invention
  • Figure 4 shows a first sticker design
  • Figure 5 shows a second sticker design
  • the invention provides a lighting system having a light guide comprising a sheet of light guiding material and an array of light out-coupling structures formed at a surface of the sheet of light guiding material.
  • the sheet is edge-lit.
  • the array of light out- coupling structures are formed as a sticker, and can be cut down to size before application to the sheet of light guiding material.
  • Figure 3 shows a first example of lighting system of the invention
  • the lighting system 30 comprises a transmissive emissive window 30 comprising LEDs 32 placed at the edge of the glazing 31 such that LED light 33 is coupled into the glass window 31.
  • the light is trapped within the glazing 31 by total internal reflection.
  • a sticker layer 35 comprises a pattern of out-coupling structures 34.
  • the pattern of out-coupling structures 34 is chosen in such a way that the LED light 33 is coupled out of the window in such a way that a uniform light emission is obtained.
  • the sticker 35 comprises an adhesive layer (for example acrylic) in combination with a rubber / plastic layer (vinyl, silicone rubber, PP, PE, or another plastic).
  • Stickers are known in the art, also window stickers are known in the art.
  • the material of conventional transparent window stickers can be used.
  • the light out-coupling structures can take the same form as in known light guides, such as scattering paint dots, micro-grooves, micro-prisms, microlenses, domains with surface roughness, phosphor dots.
  • the sticker is preferably a single self-adhesive layer (i.e. with adhesive pre- applied), but it may instead comprise a backing layer having the out-coupling structures, and a separate transparent adhesive layer.
  • the adhesive layer can then be applied as a solid layer, or as a viscous liquid. If a separate adhesive layer is used, it may be sprayed or brushed to the light guide sheet before applying the backing layer.
  • the glazing is illuminated from two opposite edges.
  • This means the pattern of light out-coupling structures has an axis of symmetry between those edges. As shown, the light out-coupling structures have greater density near the centre.
  • the desired pattern of light out-coupling structures can be formed in a variety of ways.
  • Figure 4 shows one example of a single sticker 35 which is larger than the sheet 31 to which it is to be fitted.
  • the sticker has a line 40 of mirror symmetry of the structures 34 which passes through the centre.
  • the line of symmetry is kept at the centre, so that it remains aligned with a line of symmetry of the sheet 31, as shown in Figure 4.
  • the sticker before the lighting system is assembled, can comprise a first sticker part 35a and a second sticker part 35b which together are larger than the sheet 31 of light guiding material.
  • the sticker parts are for cutting in a way that maintains one edge 42 intact.
  • the intact edges of the two sticker parts can then be abutted to form the central sticker axis.
  • the edge that is maintained intact is on the other side of the sticker, i.e. on the outer side instead of on the centre of the sheet 31.
  • the sticker parts still join in the centre, with the cut edges abutting each other. This can be used to give a lower density of light out-coupling sites (since the high density central area has then been cut off), but it means that the cut edges will be in the visible part of the sheet.
  • the two-piece sticker gives an easier cutting operation for maintaining the desired symmetry.
  • the individual sticker parts do not provide the required symmetry (although they are symmetrical in the up-down direction).
  • the out-coupling pattern to be provided on the sheet 31 has a symmetry pattern and this is formed only when the two sticker parts are abutted together.
  • the abutting edges 42 of the two sticker parts are at the symmetry axis of the desired out-coupling pattern.
  • the sheet of light guiding material can comprise highly transmissive glass, such as quartz, or plastics such as PMMA.
  • illumination is on two opposite edges of the sheet. This means the pattern is non-regular between those edges and has a line of mirror symmetry between the edges. Illumination may be from all four edges, in which case the pattern will have two lines of mirror symmetry, and be irregular in both directions. Alternatively, illumination may be on one side only, in which case there will be no symmetry in the pattern perpendicular to that one side.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L'invention concerne un système d'éclairage comprenant un guide de lumière constitué d'une feuille de matériau de guidage de lumière et un réseau de structures de couplage de sortie de lumière destiné à être monté sur une surface de la feuille de matériau de guidage de lumière. Au moins un module DEL est destiné à être monté sur un bord de la feuille de matériau de guidage de lumière pour diriger la lumière dans la feuille. Le réseau de structures de couplage de sortie de lumière comprend un autocollant destiné à être appliqué sur la feuille.
PCT/IB2011/054827 2010-11-03 2011-10-31 Feuille électroluminescente WO2012059855A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10189752 2010-11-03
EP10189752.8 2010-11-03

Publications (1)

Publication Number Publication Date
WO2012059855A1 true WO2012059855A1 (fr) 2012-05-10

Family

ID=44999829

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2011/054827 WO2012059855A1 (fr) 2010-11-03 2011-10-31 Feuille électroluminescente

Country Status (2)

Country Link
TW (1) TW201233949A (fr)
WO (1) WO2012059855A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150285445A1 (en) * 2014-04-07 2015-10-08 Crayola Llc Window Glow Device
WO2019104035A1 (fr) * 2017-11-21 2019-05-31 Corning Incorporated Appareils de rétroéclairage pour dispositifs d'affichage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6536909B1 (en) * 1998-08-26 2003-03-25 Editions Publicite Excelsior Display backlights
US20070223252A1 (en) * 2006-03-24 2007-09-27 Junwon Lee Illumination apparatus and film
WO2010017087A1 (fr) * 2008-08-08 2010-02-11 3M Innovative Properties Company Conduit de lumière ayant une couche viscoélastique pour gérer la lumière

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6536909B1 (en) * 1998-08-26 2003-03-25 Editions Publicite Excelsior Display backlights
US20070223252A1 (en) * 2006-03-24 2007-09-27 Junwon Lee Illumination apparatus and film
WO2010017087A1 (fr) * 2008-08-08 2010-02-11 3M Innovative Properties Company Conduit de lumière ayant une couche viscoélastique pour gérer la lumière

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150285445A1 (en) * 2014-04-07 2015-10-08 Crayola Llc Window Glow Device
WO2019104035A1 (fr) * 2017-11-21 2019-05-31 Corning Incorporated Appareils de rétroéclairage pour dispositifs d'affichage

Also Published As

Publication number Publication date
TW201233949A (en) 2012-08-16

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