WO2008139386A1 - Dispositif d'éclairage à effet de moiré - Google Patents

Dispositif d'éclairage à effet de moiré Download PDF

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Publication number
WO2008139386A1
WO2008139386A1 PCT/IB2008/051812 IB2008051812W WO2008139386A1 WO 2008139386 A1 WO2008139386 A1 WO 2008139386A1 IB 2008051812 W IB2008051812 W IB 2008051812W WO 2008139386 A1 WO2008139386 A1 WO 2008139386A1
Authority
WO
WIPO (PCT)
Prior art keywords
periodicity
grid
moire
array
emitting elements
Prior art date
Application number
PCT/IB2008/051812
Other languages
English (en)
Inventor
Marcellinus P. C. M. Krijn
Siebe T. De Zwart
Martin G. H. Hiddink
Michel C. J. M. Vissenberg
Ariadne D. Tenner
Joseph L. A. M. Sormani
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 WO2008139386A1 publication Critical patent/WO2008139386A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S10/00—Lighting devices or systems producing a varying lighting effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F1/00—Designs or pictures characterised by special or unusual light effects
    • B44F1/06—Designs or pictures characterised by special or unusual light effects produced by transmitted light, e.g. transparencies, imitations of glass paintings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44F—SPECIAL DESIGNS OR PICTURES
    • B44F1/00—Designs or pictures characterised by special or unusual light effects
    • B44F1/08—Designs or pictures characterised by special or unusual light effects characterised by colour effects
    • B44F1/10—Changing, amusing, or secret pictures
    • 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
    • G02B27/60—Systems using moiré fringes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

Definitions

  • the invention relates to a Moire effect lumination device comprising a housing with an optically transparent window, the housing comprising a light source, and a grid with a periodicity ⁇ g arranged in optical relationship with the transparent window.
  • the invention also relates to a method for creating a Moire effect.
  • Moire effect lumination devices and Moire effect creation methods are used in particular for decorative purposes.
  • Moire effect lumination device of the kind set forth is known from US4300068 by Baird et al. That document discloses an incandescent lamp bulb envelope for creating a Moire effect that has a plurality of transparent and nontransparent regions on its surface. When viewed from a point external to the envelope, the individual nontransparent regions on the surface of the envelope which is nearest to the point appear as superimposed upon and intersecting with nontransparent regions on the surface furthest from the point.
  • the nontransparent regions may be either light diffusive (i.e. translucent) or light nontransmissive (i.e. opaque) in nature.
  • the light source comprises an array of light emitting elements with a periodicity ⁇ ls .
  • the interference of the array of light emitting elements and the grid results in a visible Moire effect.
  • the invention provides a much simpler construction for a Moire effect lumination device by eliminating the need of a second grid to create the Moire effect.
  • the Moire effect lumination device according to the invention advantageously can be designed as a non-look-trough decorative appliance.
  • the light emitting elements are chosen to emit light with at least two spectra.
  • the light emitting elements are arranged in at least a first array emitting light with a first spectrum and having a periodicity ⁇ 1Sjl and at least a second array emitting light with a second spectrum and having a periodicity ⁇ ls , 2 .
  • the Moire effect will be constituted by Moire patterns of the individual spectral colors.
  • periodicities ⁇ ls or ⁇ g depend on the location an the array of light emitting elements and the grid, respectively.
  • this embodiment enhances the decorative effect.
  • the grid is provided with optical lenses having a periodicity X 1 .
  • Applying the optical lenses has the advantage that the array of light emitting elements is demagnified forming an array of virtual light emitting elements.
  • the Moire effect can be created with a smaller number of light emitting elements.
  • the light emitting elements are LEDs.
  • the low spatial extension of LEDs allows advantageously for a small periodicity of the array of light emitting elements.
  • the grid is provided with color filters.
  • the color filters comprise at least a first set of color filters having a first optical filtering characteristic and a periodicity X ⁇ 1 and at least a second set of color filters having a second optical filtering characteristic and a periodicity X ⁇ 2 .
  • the color filters comprise liquid crystal cells.
  • the liquid crystal cells are arranged to be controllable enabling a dynamic Moire effect.
  • the viewer observes a dynamic Moire pattern - even without repositioning himself- in accordance with the electrical control of the liquid crystal cells.
  • the invention provides a method for creating a Moire pattern as defined in claim 10.
  • the method comprises the steps of providing a light source, providing a grid with a periodicity ⁇ g arranged in optical relationship to the light source, and wherein the light source comprises an array of light emitting elements with a periodicity ⁇ ls .
  • the method has the advantage that only a single grid is needed to create a Moire pattern, since the function of the traditionally essential second grid is provided by the array of light emitting elements.
  • Fig. 1 shows a top view of an embodiment according to the invention
  • Fig. 2 graphically depicts the periodicity and wave -vector of a grid (front view)
  • Fig. 3 shows a top view of an embodiment according to the invention comprising multiple arrays of different colored light emitting elements
  • Fig. 4 shows a top view of an embodiment according to the invention comprising an array of lenses
  • Fig. 5 shows a top view of an embodiment according to the invention with a grid comprising optical filters
  • Fig. 6 shows a top view of an embodiment according to the invention with a grid comprising multiple arrays of optical filters with different filtering characteristics
  • Fig. 1 shows a top view of a Moire effect luminance device 1 according to the invention, comprising a housing 10 with an optically transparent window 11, the housing comprising a light source 30, and a grid 20 with a periodicity ⁇ g arranged in optical relationship with the transparent window 11.
  • the light source 30 comprises an array of light emitting elements 31 with a periodicity ⁇ ls .
  • the interference of the light source 30 and the grid 20 patterns create the Moire effect of this embodiment.
  • the grid 20 may be created in a wide variety of ways. For instance, it may be constructed as a separate entity inside the housing 10.
  • the grid 20 is applied on or adjacent to the transparent window 11 or by abrading the (inside or outside) surface of the window. Alternatively, it may be created by applying an opaque or diffusive coating onto the surface of the window 11.
  • a Moire pattern is an interference pattern created, for example, when two periodic grids 20 are overlaid having a slightly different grid period or when two grids 20 with equal periodicity are overlaid at an angle with respect to each other.
  • a periodic grid 20 is characterized by a wave vector k , located in the plane of the grid and directed perpendicular to the grid pattern (Fig. 2). The relation between the length of the wave-vector and the associated grid period, ⁇ g , is given by
  • the Moire pattern characterized by a wave vector k M , resulting from overlaying two grids 20 follows simply from the relation k — k — k ?
  • the first wave-vector relates to the array of light emitting elements 31, while the second relates to the grid 20.
  • Equation 2 implies that two identical non tilted grids 20 will not produce a Moire pattern.
  • Figs. 1 and 2 show the light source 30 and the grid 20 to have a periodicity in only 1 dimension (i.e. have a single wave-vector £ .) It is noted however that they may have a periodicity in 2 dimensions. In fact, the periodicity may vary as a function of location on the grid 20 or light source 30.
  • the light emitting elements 31 may all emit the same spectrum or may consist of different sets, with each set emitting light with a different spectrum. Therefore, in an embodiment according to the invention as shown in Fig. 3, the light source 30 comprises at least two arrays 41,42 of light emitting elements 31, each array emitting light with a different spectrum. Hence the array of light emitting elements 31 can be subdivided into at least a first array 41 emitting light with a first spectrum and having a periodicity ⁇ 1Sjl and in at least a second array 42 emitting light with a second spectrum and having a periodicity ⁇ 1Sj2 .
  • the array of light emitting elements 31 may comprise a third array 43 emitting light with a third spectrum and having a periodicity ⁇ lsj3 , and so on.
  • the individual periodicities ⁇ is,i, ⁇ 1Sj2 , ⁇ lsj 3, etc may be equal or may differ, depending on the Moire effect to be designed.
  • the resulting Moire effect comprises the overlapping Moire effects in the individual spectral colors, thus contributing to the decorative effect.
  • the light emitting elements 31 comprise light emitting diodes (LEDs), although it is understood that in principle any light source technology can be used - such as (filtered) incandescent bulbs, (compact) fluorescent tubes, organic LEDs, etc.
  • the LEDs may or may not be comprise a color converting medium, such as a phosphor.
  • the phosphor coated (pc-)LEDs emit a wide spectrum (including white light), while the non-pcLEDs emit a narrow band spectrum, selectable throughout the visible spectrum.
  • the Moire effect luminance device 1 may comprise, in addition to the grid 20, an array of optical lenses 50 demagnifying the real array(s) 41,42 of light emitting elements 31 with periodicities ⁇ 1Sjl , ⁇ 1Sj2 into virtual array(s) 46,47 with periodicities ⁇ ' 1Sil , ⁇ ' ls , 2 .
  • the grid 20 is provided with optical lenses 50 having a periodicity ⁇ ls so as to create a lenticular (i.e. a ID array of cylinder lenses) or lenslet array (i.e. a 2D array of round or polygonal lenses).
  • the grid 20 and the optical lenses 50 may be integrated into one entity, with for instance the grid being grinded or coated on the lenticular or lenslet array.
  • the geometrical patterns of the array(s) 41,42 of light emitting elements 31 and the array of optical lenses 50 are chosen such that the virtual images of the light emitting elements 31 of the same spectral color coincide (Fig. 4).
  • the interference between the light originating form the virtual array(s) 46,47 and the grid 20 creates the Moire effect.
  • the embodiment has the advantage that a Moire effect luminance device 1 can be created with a smaller number of light emitting elements 31.
  • the window 11, grid 20, and lens array 50 preferably are incorporated in a single entity, resulting in the virtual array(s) 46, 47 being located outside the housing 10 of the Moire effect luminance device 1. This enhances the decorative effect and stimulates the imagination of the viewer.
  • the grid 20 is provided with color filters 60 (Fig. 5).
  • the filters are applied as a coating or layer on the transparent window 11.
  • the color filters 60 transmit a predetermined part of the spectrum emitted by the light emitting elements 31 , while absorbing the complementary part.
  • the color filters 60 may transmit a predetermined part of the spectrum, while reflecting the complementary part.
  • Such filters are often referred to as dichroic filters or dichroic mirrors.
  • the reflected light can be recycled inside the housing 10 to allow it to pass a different color filter 60.
  • the filter characteristic can selectably be chosen throughout the visible spectrum so that the filter 60 transmits predominantly red, amber, green, blue, etc.
  • the, layer may comprise sections that transmit light in accordance with the filter characteristic and opaque sections blocking light.
  • the grid is provided with color filters 60 having different filtering characteristics (Fig. 6).
  • the grid is provided with at least a first set of color filters 61 having a first optical filtering characteristic and a periodicity ⁇ cf ,i and at least a second set of color filters 62 having a second optical filtering characteristic and a periodicity ⁇ c f,2.
  • the periodicity of the pattern of color filters 60 may depend on the location within the layer. The periodicity may also differ for the different colors.
  • the color filters 60 comprise liquid crystal cells.
  • the electrically controllable liquid crystal cells (according to well known control techniques in the art) enabling a dynamic Moire effect. Normally a viewer has to reposition relative to the Moire effect luminance device 1 in order to see a change in the Moire pattern.
  • the viewer observes a dynamic Moire pattern - even without repositioning himself- in accordance with the electrical control of the liquid crystal cells.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Liquid Crystal (AREA)

Abstract

Dispositif d'éclairage à effet de moiré (1) comprenant un boîtier (10) à fenêtre transparente (11), et une grille (20) dont la périodicité λg est en relation optique avec la fenêtre transparente (11). Le boîtier comprend une source lumineuse (30). Le dispositif d'éclairage à effet de moiré (1) se caractérise en ce que la source lumineuse (30) comprend un ensemble d'éléments électro-luminescents (31) avec une périodicité λls, ce qui est particulièrement avantageux du fait que l'effet de moiré peut être obtenu par un effet d'interférence entre la grille et l'ensemble d'éléments électro-luminescents. La grille est équipée de préférence d'un ensemble lenticulaire ou d'un jeu de lentilles avec des filtres colorés. Ces filtres colorés (60) comprennent de préférence des cellules à cristaux liquides commandées électriquement permettant un effet de moiré dynamique.
PCT/IB2008/051812 2007-05-14 2008-05-08 Dispositif d'éclairage à effet de moiré WO2008139386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07108109.5 2007-05-14
EP07108109 2007-05-14

Publications (1)

Publication Number Publication Date
WO2008139386A1 true WO2008139386A1 (fr) 2008-11-20

Family

ID=39712704

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2008/051812 WO2008139386A1 (fr) 2007-05-14 2008-05-08 Dispositif d'éclairage à effet de moiré

Country Status (2)

Country Link
TW (1) TW200914760A (fr)
WO (1) WO2008139386A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009013088U1 (de) 2009-09-29 2011-02-24 Zumtobel Lighting Gmbh Beleuchtungsanordnung mit Lichtbeeinflussungselement

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905439A2 (fr) * 1997-09-24 1999-03-31 SWARCO FUTURIT Verkehrssignalsysteme Ges.m.b.H. Indicateur optique de signaux à sources lumineuses multiples
US20010035924A1 (en) * 2000-04-26 2001-11-01 Ichiro Fujieda Liquid crystal display device having a front light unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0905439A2 (fr) * 1997-09-24 1999-03-31 SWARCO FUTURIT Verkehrssignalsysteme Ges.m.b.H. Indicateur optique de signaux à sources lumineuses multiples
US20010035924A1 (en) * 2000-04-26 2001-11-01 Ichiro Fujieda Liquid crystal display device having a front light unit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202009013088U1 (de) 2009-09-29 2011-02-24 Zumtobel Lighting Gmbh Beleuchtungsanordnung mit Lichtbeeinflussungselement
WO2011039272A1 (fr) 2009-09-29 2011-04-07 Zumtobel Lighting Gmbh Dispositif d'éclairage comprenant un élément d'action sur la lumière

Also Published As

Publication number Publication date
TW200914760A (en) 2009-04-01

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