WO2009019627A2 - Dispositif d'éclairage à lumière de surface à diodes électroluminescentes à émission latérale - Google Patents

Dispositif d'éclairage à lumière de surface à diodes électroluminescentes à émission latérale Download PDF

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Publication number
WO2009019627A2
WO2009019627A2 PCT/IB2008/053036 IB2008053036W WO2009019627A2 WO 2009019627 A2 WO2009019627 A2 WO 2009019627A2 IB 2008053036 W IB2008053036 W IB 2008053036W WO 2009019627 A2 WO2009019627 A2 WO 2009019627A2
Authority
WO
WIPO (PCT)
Prior art keywords
light
illumination system
waveguide
previous
coupling structures
Prior art date
Application number
PCT/IB2008/053036
Other languages
English (en)
Other versions
WO2009019627A3 (fr
Inventor
Lingli Wang
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 WO2009019627A2 publication Critical patent/WO2009019627A2/fr
Publication of WO2009019627A3 publication Critical patent/WO2009019627A3/fr

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
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • 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
    • G02B6/003—Lens or lenticular sheet or layer
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0038—Linear indentations or grooves, e.g. arc-shaped grooves or meandering grooves, extending over the full length or width of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs

Definitions

  • the invention relates to the field of surface light illumination using solid-state lighting devices and, in particular, to obtain a surface light illumination device with a homogeneous light distribution and a high system efficiency.
  • LEDs Light Emitting Diodes
  • LEDs are ideal light sources for surface light illumination applications due to their advantages in comparison to incandescent light (e.g. light bulbs), such as a longer life span, more light per watt, a smaller size, lower power consumption, better robustness, etc.
  • the first method uses indirect illumination, where light from LEDs are coupled into a waveguide and coupled out into the surroundings by an out-coupling structure.
  • the LEDs can in this case be either high or low power LEDs, and the out-coupling structures can for instance be micro structures, diffuser materials, or white paint.
  • the second method is based on direct illumination by surface-array LEDs together with an optical element for generating a homogenous light distribution.
  • the LEDs used in this method are often low power LEDs, and the optical element is often a diffuser or some other light scattering micro structure.
  • the drawback with this method is that it can only be used with low power LEDs. If high power LEDs are used the device would be to thick and bulky and not usable in lighting application, especially in consumer products.
  • an illumination system comprising, at least one light emitting device comprising, a waveguide, said waveguide comprise of a first surface, a second surface opposite of said first surface, and at least one light coupling sidewall structure between said first and second surfaces, at least one side emitting light source placed between planes defined by said first and second surfaces, such that emitted light from said at least one side emitting light source is coupled into said waveguide and coupled out from said second surface, and a plate assembly, wherein said at least one light emitting device is placed in said plate assembly.
  • This arrangement will provide a surface emitting light illumination system which have a high light flux, due to the side emitting LED(s), with a homogeneous light distribution. It will also offer design freedom.
  • the illumination system may comprise at least one light coupling sidewall structure forming an outer portion of said waveguide. This will direct the light coming from the side emitting LED(s) throughout the waveguide, to the surroundings.
  • the illumination system may comprise a waveguide which comprises out- coupling structures. The out-coupling structures will provide a homogeneous light distribution from the light emitting device.
  • the illumination system may comprise at least one light coupling sidewall structure made of a light reflective or a light diffusing material, or be coated with a light reflective or a light diffusing material, or be a flat polished surface utilizing the TIR effect.
  • the materials or coating will improve the reflectivity, or diffusion, of the emitted light impinging on the light coupling sidewall structure.
  • the illumination system may comprise at leas one of said at least one light coupling sidewall structure which is part of said out-coupling structures.
  • the illumination system may comprise a waveguide which comprises several light coupling structures. These structures will help in creating a homogeneous illumination.
  • the illumination system may comprise light coupling structures which are made of a light reflective or a light diffusing material, or is coated with a light reflective or a light diffusing material, or is a flat polished surface utilizing the TIR effect, or a semi- reflective material.
  • the materials or coating will improve the reflectivity, or diffusion, of the emitted light impinging on the light coupling structures.
  • the illumination system may comprise light coupling structures which is part of said out-coupling structures.
  • the illumination system may comprise a light source which is comprise at least one of the following: light emitting diode (LED), organic light emitting diode (OLED).
  • LED light emitting diode
  • OLED organic light emitting diode
  • the illumination system may comprise a light source which emits light in at least one of the wavelengths corresponding to infrared-, visible-, or ultraviolet light spectrum.
  • the illumination system may comprise at least one light emitting device comprises at least two light emitting devices distributed in said plate assembly in a geometrical shape. To improve the light flux several light emitting devices can be placed in the plate assembly in different shapes best suited for a given application.
  • the illumination system may comprise a geometrical shape which is at least one of the following: row, circle, or a matrix.
  • the geometrical shape can also comprise asymmetrical patterns, wave patterns, or other artistic and application specific shapes.
  • the illumination system may comprise a geometrical shape which is in a plane of said plate assembly.
  • the illumination system may comprise a curved plane. This means for instance that the shape can be in three-dimensions, such as in a sphere, wave shape, or any other shape covering a three-dimensional surface.
  • Figure 1 shows a cross-section view of a common side emitting light emitting diode structure.
  • Figure 2 shows a cross-section view of a light emitting device.
  • Figure 3 shows a cross-section view of a light emitting device with out- coupling structures.
  • Figure 4 shows a cross-section view of a light emitting device in optical simulation.
  • Figure 5a shows a top view of a round light emitting device in optical simulation.
  • Figure 5b shows a top view of a square light emitting device in optical simulation.
  • Figure 6 shows a cross-section view of a surface light illumination light emitting device.
  • Figure 7a shows a top view of a surface light illumination system with round light emitting devices in a plate assembly.
  • Figure 7b shows a top view of a surface light illumination system with square light emitting devices in a plate assembly.
  • Figure 8 shows a cross-section view of a light emitting device with light coupling structures and out-coupling structures.
  • Figure 1 shows a cross-section side view of a common side emitting LED structure 100.
  • the side emitting LED structure is comprised of a LED-die 102, which in operation is able to emitted light of a specific colour depending on the composition of the semi-conducting material used, a hourglass shaped lens 104 made from glass or any other heat tolerant and optical clear material, a sub-mount 103, and an outer package 101, consisting of a heat sink or a printed board, with or without a added thermal heat sink, which the sub-mount 103 is mounted on.
  • the side emitting LED When the side emitting LED is in operation, it will typically emit most of its light 106 out through the sides (hence the name side emitting) of the lens 104, however depending on the construction of the lens 104, some light may also be emitted out of at the top 105 of the lens 104. To prevent any light to be transmitted out of the top 105 of the lens, a reflective element or coating can be applied onto the top of the lens 105. The shape of the lens 104 may also be changed to get other radiation patterns.
  • the emitted light from the side emitting LED structure 100 can either be in the infrared, visible or near-ultraviolet spectrum.
  • FIG. 2 shows a cross-section side view of an embodiment of the present invention.
  • one or more high power side emitting LED structures 203 are used together with waveguides 207, comprised of a first 209 and a second 210 surface placed opposite of each other, to form a light module 201.
  • the light emitted from the high powered side emitting LED, or LEDs, placed in the centre of the light module 201 is effectively coupled into the waveguides 207 by its construction.
  • the light is then coupled out, into the surroundings, by reflective side walls 208 in the waveguides 203.
  • the sidewalls 208 of the waveguides 207 can be made of, or coated with, a reflective material, such as metal.
  • the surfaces of the sidewalls 208 can also be made roughened to act as an diffuser, or be made as a flat polished surface to utilize the Total Internal Reflection (TIR) effect.
  • the first 209 and second 210 surfaces can be made either by a non-transparent material (e.g. reflective material such as metal) or by a semi- or transparent material.
  • the part 205 over the side emitting LED 203 can be made of or coated with a diffuse or reflective material to better couple the light into the waveguides. However, part 205 can also be made of an transparent material to allow the transmission of light coming from the side emitting LED 203 underneath.
  • the light module 201 arrangement allows for a compact design with high brightness which is ideal for making a high efficiency surface light illumination system with a homogeneous light distribution.
  • LED devices such as the Batwings LED or the Lambertian LED, which have slightly different light radiation patterns, can be used instead of the side emitting LED as a light source in the light module 201.
  • FIG. 3 shows a cross-section side view of an another embodiment of the present invention.
  • one or more high power side emitting LED structures 303 are used together with waveguides 307, having a first 312 and a second 311 surface, with out-coupling structures 309.
  • the light emitted from the high powered side emitting LED, or LEDs, placed in the centre of the light module 301 is effectively coupled into the waveguides 307 by its construction.
  • the light is then coupled out, into the surroundings, by the reflective sidewalls 308, in the waveguides 307, and the out-coupling structures 309.
  • the sidewalls 308 of the waveguides 307 can be made of, or coated with, a reflective material, such as metal.
  • the surfaces of the sidewalls 308 can also be made roughened to act as an diffuser, or be made as a flat polished surface to utilize the Total Internal Reflection (TIR) effect.
  • TIR Total Internal Reflection
  • the first 311 and second 312 surfaces can be made either by a non-transparent material (e.g. reflective material such as metal) or by a semi- or transparent material.
  • the out-coupling structures 309, together with a transparent or semi- transparent second surface 312, are designed to create a homogeneous light distribution 313 over the entire output surface of the light module 301.
  • the part 310 over the side emitting LED 203 can either be made transparent, allowing the transmission of light coming from the side emitting LED 203 underneath, or semi-transparent to contribute to both couple light into the waveguides and out to the surroundings.
  • This light module 301 arrangement allows for an equally compact design as the embodiment presented in figure 2, but with a larger and more efficient light emitting surface.
  • the light module 301 design is perfect to use to create a high efficient surface light illumination system with a homogeneous light distribution.
  • LED devices such as the Batwings LED or the Lambertian LED, which have slightly different light radiation patterns, can be used instead of the side emitting LED as a light source in the light module 301.
  • Figure 4 shows an optical simulation of the light module presented in figure 3.
  • the light module 40 lean be made with different lengths and thicknesses, and the overall shape can be changed (e.g. circular, elliptic, rectangular, etc.) to conform to different applications. This allows for a great design freedom which is important, especially if the light module is going to be used in consumer product.
  • Figure 5 shows a top view of two light modules with different shapes.
  • the light module 501 in figure 5a shows a top view optical simulation of the round light module in figure 4, while the light module 503 in figure 5b shows a top view optical simulation of a similar but square-shaped light module.
  • Figure 6 shows another embodiment of the present invention.
  • the figure shows a cross-section side view of how a surface light illumination device 601 is constructed out of three light modules 605, as described in conjunction with figure 2 or 3, placed in a light fixture or plate assembly 603.
  • the plate assembly 603 can be made from a variety of materials such as plastic, metal or any other suitable material required for a specific application.
  • Air vents 607 can be placed in the vicinity of the light modules 605 to re-direct light beam using TIR principle and to vent surplus heat, cooling the light modules 605.
  • Figure 7 shows top views of two surface light illumination device 701, 702.
  • Figure 7a shows a surface light illumination device 701 where sixteen round light modules 705 are placed in square pattern in a light fixture or plate assembly 703
  • figure 7b shows a surface light illumination device 702 where sixteen square light modules 706 are placed in square pattern in a plate assembly 706.
  • the light modules can be placed in different patterns, with different spacing between them, to get a desired light distributions for different applications.
  • the shape of the plate assembly can also be shaped differently to depending on the application.
  • Figure 8 shows a cross-section side view of an another embodiment of the present invention.
  • one or more high power side emitting LED structures 803 are used together with waveguides 807, having a first 810 and a second 809 surface, light coupling structures 811, and out-coupling structures 812.
  • the light emitted from the high powered side emitting LED, or LEDs, placed in the centre of the light module 801 is effectively coupled into the waveguides 807 by its construction.
  • the light is then coupled out, into the surroundings, by the reflective sidewalls 808, in the waveguides 807, the light coupling structures 811, and the out-coupling structures 812.
  • the sidewalls 808 of the waveguides 807 can be made of, or coated with, a reflective material, such as metal.
  • the surfaces of the sidewalls 808 can also be made roughened to act as an diffuser, or be made as a flat polished surface to utilize the Total Internal Reflection (TIR) effect.
  • TIR Total Internal Reflection
  • the first 809 and second 810 surfaces can be made either by a non-transparent material (e.g. reflective material such as metal) or by a semi- or transparent material.
  • the light coupling structures 811 and the out-coupling structures 812, together with a transparent or semi-transparent second surface 810, are designed to create a homogeneous light distribution 813 over the entire output surface of the light module 801.
  • the part 805 over the side emitting LED 803 can either be made transparent, allowing the transmission of light coming from the side emitting LED 803 underneath, or semi-transparent to contribute to both couple light into the waveguides and out to the surroundings.
  • This light module 801 arrangement allows for a compact design of a high efficient surface light illumination system with a homogeneous light distribution.
  • the surface light illumination devices presented in the embodiments of the present invention presented in figure 6 and 7, have many advantages compared to commonly used surface light illumination devices.
  • the advantages resulting from the invention are that the surface light illumination device enables the use of high power side emitting LEDs for surface light illumination with the benefit of getting a thin device, it makes it possible to tailor a desired and homogeneous light distribution, it offers a high efficiency system/device with reduced heat problems, and great design freedom.

Abstract

L'invention concerne un système d'éclairage comprenant au moins un dispositif d'émission de lumière comprenant un guide d'onde, le guide d'onde comprenant une première surface, une seconde surface opposée à ladite première surface, et au moins une structure de paroi latérale de couplage de lumière entre lesdites première et seconde surfaces. Le système comprend aussi au moins une source de lumière à émission latérale, placée entre des plans définis par les première et seconde surfaces, de sorte que la lumière émise par l'au moins une source de lumière à émission latérale est couplée dans ledit guide d'onde et couplée vers l'extérieur à partir de la seconde surface, et un assemblage de plaques, l'au moins un dispositif émettant de la lumière étant placé dans l'assemblage de plaques.
PCT/IB2008/053036 2007-08-03 2008-07-29 Dispositif d'éclairage à lumière de surface à diodes électroluminescentes à émission latérale WO2009019627A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07113748.3 2007-08-03
EP07113748 2007-08-03

Publications (2)

Publication Number Publication Date
WO2009019627A2 true WO2009019627A2 (fr) 2009-02-12
WO2009019627A3 WO2009019627A3 (fr) 2009-04-02

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Country Link
TW (1) TW200923270A (fr)
WO (1) WO2009019627A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8864346B2 (en) * 2012-12-10 2014-10-21 GE Lighting Solutions, LLC Lens-reflector combination for batwing light distribution

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060002146A1 (en) * 2004-07-01 2006-01-05 Nec Lcd Technologies, Ltd. Backlight unit and liquid crystal display device using the same
US20070058393A1 (en) * 2005-09-09 2007-03-15 Samsung Electronics Co., Ltd. Backlight unit and display device having the same
WO2007064002A1 (fr) * 2005-11-30 2007-06-07 Showa Denko K.K. Element guide de lumiere, dispositif source de lumiere plan dote de cet element guide de lumiere et appareil d’affichage utilisant ce dispositif source de lumiere plan
WO2007075549A1 (fr) * 2005-12-21 2007-07-05 3M Innovative Properties Company Élément de confinement de lumière de diode led
US20070159849A1 (en) * 2006-01-06 2007-07-12 Asagicreate Co., Ltd. Surface light source and electrically illuminated signboard

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060002146A1 (en) * 2004-07-01 2006-01-05 Nec Lcd Technologies, Ltd. Backlight unit and liquid crystal display device using the same
US20070058393A1 (en) * 2005-09-09 2007-03-15 Samsung Electronics Co., Ltd. Backlight unit and display device having the same
WO2007064002A1 (fr) * 2005-11-30 2007-06-07 Showa Denko K.K. Element guide de lumiere, dispositif source de lumiere plan dote de cet element guide de lumiere et appareil d’affichage utilisant ce dispositif source de lumiere plan
WO2007075549A1 (fr) * 2005-12-21 2007-07-05 3M Innovative Properties Company Élément de confinement de lumière de diode led
US20070159849A1 (en) * 2006-01-06 2007-07-12 Asagicreate Co., Ltd. Surface light source and electrically illuminated signboard

Also Published As

Publication number Publication date
WO2009019627A3 (fr) 2009-04-02
TW200923270A (en) 2009-06-01

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