WO2012032436A1 - Système d'éclairement segmenté - Google Patents

Système d'éclairement segmenté Download PDF

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Publication number
WO2012032436A1
WO2012032436A1 PCT/IB2011/053788 IB2011053788W WO2012032436A1 WO 2012032436 A1 WO2012032436 A1 WO 2012032436A1 IB 2011053788 W IB2011053788 W IB 2011053788W WO 2012032436 A1 WO2012032436 A1 WO 2012032436A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
illumination system
light sources
area
display
Prior art date
Application number
PCT/IB2011/053788
Other languages
English (en)
Inventor
Lieve Lea Andrea Lanoye
Filip Marcel Denise Bruyneel
Wim Housen
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 WO2012032436A1 publication Critical patent/WO2012032436A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S4/00—Lighting devices or systems using a string or strip of light sources
    • F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
    • F21S4/28—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports rigid, e.g. LED bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V5/00—Refractors for light sources
    • 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
    • F21Y2103/00—Elongate light sources, e.g. fluorescent tubes
    • F21Y2103/10—Elongate light sources, e.g. fluorescent tubes comprising a linear array of point-like light-generating elements
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/57—Control of contrast or brightness
    • H04N5/58—Control of contrast or brightness in dependence upon ambient light

Definitions

  • the present invention pertains to the field of illumination systems.
  • the present invention pertains to an illumination system with the capability of producing illuminated segments from a single collection of light sources.
  • Illumination systems for producing separate illuminated segments such as for enhanced viewing experience when watching video shown on a display device, for example a TV, by using different combinations of light sources (11) and refractive elements for projecting light onto a surface to create illuminated segments, are known in the art.
  • a particularly interesting application of illuminated segments is to project light as ambient light on a wall using ambient light sources (11) surrounding the display device and/or projecting the ambient light towards a viewer.
  • a display device having ambient lighting functionality is a flat TV, which may hang on a surface, such as a wall, or placed in front of the surface.
  • the display device may be provided with ambient light sources (11), such as Light Emitting Diodes, located adjacent to a display area or screen being capable of displaying diffuse light correlated to the images or video content presented on the display area.
  • the ambient light sources (11) may emit ambient light towards a surface behind the display device and/or towards a viewer in front of the display device.
  • Fig. 1 shows an illumination system according to prior art, wherein two different light sources (11) A are mounted on a circuit board C, which in turn is mounted on a support S.
  • the light from the light sources (11) is refracted by a refractive unit R to illuminate a region behind the refractive unit R.
  • the mutual position of the light sources (11) A may be varied, or the light sources (11) A may be of different kinds.
  • Fig. 1A show an example of prior art with different light sources (11) Al, A2, mounted on the same circuit board C.
  • Fig. IB show an example of a prior art where the light sources (11) A are positioned on two different circuit boards CI, C2.
  • a problem with the solutions according to prior art is that they are bulky, since two different light sources (11) Al, A2, or two different circuit boards CI, C2 needs to be covered by the refractive unit R. Furthermore, the system is complex and which increase production costs and the likelihood of system failure.
  • the present invention preferably seeks to mitigate, alleviate or eliminate one or more of the above-identified deficiencies in the art and disadvantages singly or in any combination and solves at least the above mentioned problems by providing an illumination system according to the appended patent claims.
  • An object of the invention is to provide a compact illumination system.
  • an illumination system for segmented illumination of a region comprises at least a first light source and a second light source arranged side-by-side in a single array.
  • the system also comprises a semi-transparent refractive sheet, positioned between the light sources and the region.
  • the semi-transparent refractive sheet is composed of at least a first area and second area, wherein each area, depending on the incident light angle from each of the light sources, is configured to refract a first part of the light emitted from each of the light sources into at least one illuminated segment towards the region.
  • Each area is also configured to reflect a second part of the light emitted from each of the light sources in a direction away from the region.
  • the first area When a first part of incident light from a light source (11a, 1 lb) is refracted by the first area, the first area is configured to reflect incident light from a neighboring light source, and when a first part of incident light from a light source is refracted by the second area, the second area is configured to reflect incident light from a neighboring light source.
  • a display device having ambient light capability is provided, wherein the ambient light capability is provided by an illumination system according to an aspect.
  • An advantage of the illumination system is that only one array of light sources is needed, which saves space. Another advantage of the illumination system is that the number of components needed is decreased, which is cost effective.
  • Another advantage with the illumination system is that no collimator parts are needed, which saves space.
  • FIGs. 1A and IB are an illustration of an illumination system according to prior art, included for comparative reasons;
  • Fig. 2 is an illustration an illumination system according to an embodiment
  • Fig. 3 is an illustration of a refractive principle according to an embodiment
  • FIGS. 4 and 5 are illustrations of an illumination system according to embodiments
  • Figs. 6A and 6B are a schematic overview of the refraction of light according to an embodiment
  • Fig. 7 is an illustration an illumination system according to an embodiment
  • Fig. 8 is an illustration of a refractive sheet according to an embodiment
  • Fig. 9 is an illustration of a display device according to an embodiment.
  • An idea of the present invention is to use a semi-transparent refractive sheet 12, which is only semi-transparent to the light from a light source 11. Thus, part of the light is refracted in the desired direction and part of the light is reflected so that it substantially does not penetrate the refractive sheet 12.
  • an illumination system 10 for segmented illumination of a region 100 such as a wall
  • the system 10 comprises a light source 11 and a semi-transparent refractive sheet 12.
  • the refractive sheet 12 is located between the light source 11 and the region 100 and is refracting one part of the light from the light source 11 into at least one illuminated segment, i.e. a halo, onto the region 100, and is reflecting another part of the light from the light source 11 so that this part of the light does not penetrate the refractive sheet 12.
  • Fig. 3 The principle is illustrated in Fig. 3, where part of the light emitted from the light source 11 is reflected against the refractive sheet 12 and part of the light is refracted in a desired direction.
  • An advantage with this is that no separate collimation is needed to gather the light from the light source 11 into an illuminated segment.
  • the light sources 11 are substantially point-like and arranged side-by- side in a single array covered by the refractive sheet 12.
  • the refractive sheet 12 is refracting the light from all the light sources in the same way, thus creating one illuminated segment on the region 100.
  • the light sources 11 are substantially point-like and arranged side-by- side in a single array covered by the refractive sheet 12.
  • the refractive sheet 12 comprises two different areas 121, 122 with different optical properties.
  • Each area 121, 122, depending on the incident light angle from each of the light sources 11, is configured to refract a first part of the light emitted from each of the light sources 11 into at least one illuminated segment towards the region 100, while
  • the first area 121 when a first part of incident light from a light source 11a, 1 lb is refracted by the first area 121, is configured to reflect incident light from a neighboring light source 11a, 1 lb.
  • the second area 122 when a first part of incident light from a light source 1 la, 1 lb is refracted by the second area 122, is configured to reflect incident light from a neighboring light source 1 la, 1 lb.
  • the first area 121 is refracting one part of the light from a first set of the light sources 1 la in one direction into a first illuminated segment on the region 100. A substantial part of the rest of the light from the first set of the light sources 1 la is reflected, thus never penetrating the refractive sheet 12.
  • the second refractive area 122 is refracting one part of the light from a second set of the light sources 1 lb in one direction into a second illuminated segment on the region 100. A substantial part of the rest of the light from the first set of the light sources 1 lb is reflected, thus never penetrating the refractive sheet 12.
  • the refractive sheet 12 may be common to said light sources 1 la, 1 lb. However, in an embodiment (not shown), separate refractive sheets 12 are provided for the light sources 11a and 1 lb, respectively.
  • FIG. 6A A schematic overview of the refraction of light is seen in Fig. 6.
  • Fig. 6B the first illuminated segment 61 on the region 100 and the second illuminated segment 62 on the region 100 are also shown.
  • the first and second illuminated segments 61, 62 are essentially separated in a dimension perpendicular to the extension of the single array.
  • the two illuminated segments 61, 62 are perceived as two separate halos of light.
  • the first set of the light sources 1 la is of one color and the second set of light sources 1 lb is of another color.
  • the first and second illuminated segments 61 and 62 may be of different colors.
  • the first and second set of the light sources 11a, 1 lb are of the same color.
  • the two illuminated segments 61, 62 may be calibrated so as to be perceived either as two separate halos of light, or as the same halo.
  • the color of the first and second set of the light sources 11a, 1 lb is independently variable so that the two illuminated segments 61, 62 are perceived as one halo of light when the light sources 1 la, 1 lb have the same color, and as two separate halos of light when the light sources 11a, 1 lb have different colors.
  • the refractive sheet has three different refractive areas, thus causing the light from the light sources to be divided into three or more illuminated segments.
  • the three or more illuminated segments may be of same or different colors, and perceived as one or many halo(s), which will be appreciated by a person skilled in the art.
  • the system 10 comprises a control unit 70, configured to individually control the light sources to form at least a first and a second group of light sources 11a, 1 lb.
  • Each group of light sources 11a, 1 lb may consist of a single light source, such as a LED, but may also comprise several light sources, connected to the control unit so as to form a group of light sources.
  • the illuminated segments 61, 62 are illuminated by different groups of light sources 11a, 1 lb.
  • the number of light sources may depend on the available voltage in the system (e.g. 24V, 12V).
  • the light sources may also be configured so that one illuminated segment 61, 62 may be illuminated by more than one group of light sources.
  • the light sources 11a, l ib may be any kind of light source.
  • the light sources 11 comprise Light Emitting Diodes (LEDs).
  • the LEDs are of the same type.
  • the LEDs are mounted on a printed circuit board (PCB). In an embodiment, the LEDs are mounted on the same PCB.
  • PCB printed circuit board
  • the LEDs may be both top emitting LEDs and side emitting LEDs, which will be appreciated by a person skilled in the art.
  • an illumination system wherein the distance between the light sources 1 la, 1 lb and the refractive sheet 12 is variable. This allows adjustment of the region of illumination.
  • the refractive sheet comprises a foil.
  • the foil may be laminated onto a carrier 80.
  • the first area 121 is laminated onto one of two opposite sides of the carrier 80 and second area 122 is laminated onto the other of the two opposite sides of the carrier 80.
  • the first and second area 121, 122 are laminate don the same side of the carrier 80.
  • a display device 90 having ambient light capability is provided, wherein the ambient light capability is provided by an
  • the display device may be any kind of display device, such as selected from the group consisting of computer monitor display, cathode ray tube (CRT) display, liquid crystal display (LCD), light emitting diode (LED) display, organic light emitting diode (OLED) display, plasma discharge display, or a display using a functionally equivalent display technology.
  • CTR cathode ray tube
  • LCD liquid crystal display
  • LED light emitting diode
  • OLED organic light emitting diode
  • plasma discharge display or a display using a functionally equivalent display technology.
  • the illumination system is not limited merely to display devices, but may be utilized in any illumination system, for any device, for which segmented illumination is desired.
  • the illumination system according to some embodiments could be utilized in e.g. a hifi system, on a receiver, a telephone, in conjunction with a noticeboard, wall etc.
  • the invention may be implemented in any suitable form including hardware, software, firmware or any combination of these.
  • the elements and components of an embodiment of the invention may be physically, functionally and logically implemented in any suitable way. Indeed, the functionality may be implemented in a single unit, in a plurality of units or as part of other functional units. As such, the invention may be implemented in a single unit, or may be physically and functionally distributed between different units and processors.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)

Abstract

L'invention concerne un système d'éclairement (10) capable de produire des segments éclairés à partir d'un ensemble unique de sources lumineuses. Le système d'éclairement comprend au moins une première source lumineuse (11a) et une seconde source lumineuse (11b) agencées côte à côte pour former un groupement unique, et une feuille réfractante semi-transparente (12) positionnée entre les sources lumineuses (11) et la région (100). Un dispositif d'affichage présentant également une capacité d'émission de lumière ambiante est également prévu, la capacité d'émission de lumière ambiante étant assurée par le système d'éclairement (10).
PCT/IB2011/053788 2010-09-08 2011-08-30 Système d'éclairement segmenté WO2012032436A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP10175709.4 2010-09-08
EP10175709 2010-09-08

Publications (1)

Publication Number Publication Date
WO2012032436A1 true WO2012032436A1 (fr) 2012-03-15

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PCT/IB2011/053788 WO2012032436A1 (fr) 2010-09-08 2011-08-30 Système d'éclairement segmenté

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WO (1) WO2012032436A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11168869B2 (en) 2014-11-24 2021-11-09 Signify Holding B.V. Lighting device and lighting system

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4853593A (en) * 1986-09-30 1989-08-01 Siemens Aktiengesellschaft Light emitting diode (LED) display
WO2001007828A1 (fr) * 1999-07-21 2001-02-01 Teledyne Lighting And Display Products, Inc. Appareil d'eclairage
WO2003026358A1 (fr) * 2001-09-17 2003-03-27 Color Kinetics Incorporated Produits a diodes electroluminescentes
WO2007138294A1 (fr) * 2006-05-26 2007-12-06 Design Led Products Limited Dispositif de guidage de lumière composite
US20090161341A1 (en) * 2007-12-19 2009-06-25 Noam Meir Planar White Illumination Apparatus

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4853593A (en) * 1986-09-30 1989-08-01 Siemens Aktiengesellschaft Light emitting diode (LED) display
WO2001007828A1 (fr) * 1999-07-21 2001-02-01 Teledyne Lighting And Display Products, Inc. Appareil d'eclairage
WO2003026358A1 (fr) * 2001-09-17 2003-03-27 Color Kinetics Incorporated Produits a diodes electroluminescentes
WO2007138294A1 (fr) * 2006-05-26 2007-12-06 Design Led Products Limited Dispositif de guidage de lumière composite
US20090161341A1 (en) * 2007-12-19 2009-06-25 Noam Meir Planar White Illumination Apparatus

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11168869B2 (en) 2014-11-24 2021-11-09 Signify Holding B.V. Lighting device and lighting system

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