WO2001084046A1 - Illumination system and display device - Google Patents
Illumination system and display device Download PDFInfo
- Publication number
- WO2001084046A1 WO2001084046A1 PCT/EP2001/004369 EP0104369W WO0184046A1 WO 2001084046 A1 WO2001084046 A1 WO 2001084046A1 EP 0104369 W EP0104369 W EP 0104369W WO 0184046 A1 WO0184046 A1 WO 0184046A1
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- WO
- WIPO (PCT)
- Prior art keywords
- light
- illumination system
- panel
- emitting
- sub
- Prior art date
Links
- 238000005286 illumination Methods 0.000 title claims description 86
- 230000004907 flux Effects 0.000 claims abstract description 10
- 230000008878 coupling Effects 0.000 claims description 28
- 238000010168 coupling process Methods 0.000 claims description 28
- 238000005859 coupling reaction Methods 0.000 claims description 28
- 230000003287 optical effect Effects 0.000 claims description 10
- 230000007480 spreading Effects 0.000 claims description 2
- 238000009826 distribution Methods 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 239000003086 colorant Substances 0.000 description 3
- 230000002349 favourable effect Effects 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 239000004926 polymethyl methacrylate Substances 0.000 description 2
- 229920005439 Perspex® Polymers 0.000 description 1
- 241001223864 Sphyraena barracuda Species 0.000 description 1
- -1 acryl Chemical group 0.000 description 1
- 230000021615 conjugation Effects 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 230000008713 feedback mechanism Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004417 polycarbonate Substances 0.000 description 1
- 229920000515 polycarbonate Polymers 0.000 description 1
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- 238000005488 sandblasting Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000009827 uniform distribution Methods 0.000 description 1
Classifications
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- 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
-
- 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
- G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
-
- 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
- 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
- G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
- G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface of the light guide
-
- 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
- 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
- G02B6/0075—Arrangements of multiple light guides
- G02B6/0076—Stacked arrangements of multiple light guides of the same or different cross-sectional area
-
- 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
- G02F1/133621—Illuminating devices providing coloured light
Definitions
- the invention relates to an illumination system for illuminating a display device, which illumination system is provided with a light-emitting panel comprising
- the invention also relates to a display device comprising said illumination system.
- Such illumination systems are known per se and are alternatively referred to as edge-lighting systems. They are used, inter alia, as backlighting of (image) display devices, for example for television receivers and monitors.
- Such illumination systems can particularly suitably be used as a backlight for non-emissive displays, such as liquid crystal display devices, also referred to as LCD panels, which are used in (portable) computers or (cordless) telephones.
- Said display devices generally include a substrate provided with a regular pattern of pixels, which are each driven by at least one electrode.
- the display device uses a control circuit.
- the light originating from the backlight is modulated by means of a switch or a modulator, while applying various types of liquid crystal effects.
- the display may be based on electrophoretic or electromechanical effects.
- a tubular low-pressure mercury-vapor discharge lamp for example one or more compact fluorescent lamps
- the light source is used as the light source, the light which, in operation, is emitted by the light source being coupled into the light-emitting panel which serves as an optical waveguide.
- This optical waveguide generally forms a comparatively thin and flat panel which is made, for example, of a synthetic resin or glass, light being transported through the optical waveguide under the influence of (total) internal reflection.
- Such an illumination system may also be provided with an alternative light source in the form of a plurality of optoelectronic elements, also referred to as electro-optic elements, such as electroluminescent elements, for example light-emitting diodes (LEDs).
- These light sources are generally provided in the proximity of or contiguous to a light- transmitting edge area of the light-emitting panel, so that, in operation, light originating from the light source is incident on the light-transmitting edge area and spreads in the panel.
- EP-A 446 324 discloses an illumination system which causes an LCD panel to be illuminated at different types of ambient light.
- For the light source use is made of incandescent lamps which couple light into a light-emitting panel, also referred to as light pipe.
- a light-emitting panel also referred to as light pipe.
- multiple reflections of light bring about a light distribution to illuminate the LCD panel.
- An illumination system of the above-mentioned type has the disadvantage that the light distribution in the light-emitting panel, particularly in the proximity of the light source, is insufficiently uniform. As a result, the illumination uniformity of the display device is insufficient.
- the invention more particularly aims at providing an illumination system of the type mentioned in the opening paragraph, wherein the uniformity of the light distribution of the illumination system and hence the uniformity with which the display device is illuminated are improved.
- the illumination system comprises at least two light-emitting panels, which panels are arranged at least substantially parallel to each other, and - sub-surfaces of the rear walls of each of the light-emitting panels are provided with means for coupling light out of the panel,
- the use of a plurality of light-emitting panels in the illumination system in accordance with the invention has the advantage that the sub-surfaces of each of the rear walls of the light-emitting panels co-operate with each other so as to uniformly illuminate the display device.
- Both the choice of the sub-surfaces and the distribution of the means for coupling out light over the sub-surfaces are such that the light emitted, in operation, by each of the sub-surfaces uniformly illuminates the (imaginary) projection area.
- the projection area corresponds to the display device surface to be illuminated, a uniformly illuminated projection area leads to a uniform illumination of the (image) display device.
- the uniformity of the distribution of the light emitted by the illumination system is improved.
- a more uniform illumination of the (image) display device is obtained.
- a further advantage of the application of multiple light panels resides in that the light output and the light distribution of each of the panels can be influenced individually.
- the light panels are preferably arranged one behind another.
- the arrangement of the sub-surfaces with respect to the light source influences the way in which light issues from the light-emitting panel.
- a preferred embodiment of the illumination system in accordance with the invention is characterized in that the sub-surfaces are situated at a distance from the light-transmitting edge areas. Particularly in the proximity of the light source, the light distribution of the known light-emitting panel is insufficiently uniform. If, in accordance with the invention, the sub-surfaces, which couple light out of the panel, are chosen so as to be not adjacent or near the light source associated with the relevant light-emitting panel, then the influence of the light source on the light coupled out by the panel is reduced.
- each of the sub-surfaces comprises a single surface covering approximately half the rear wall of the light-emitting panel, the means for coupling out light being provided such that the degree to which light is coupled out is substantially constant over the subsurface.
- the illumination system comprises two light- emitting panels, each of the light-emitting panels being responsible for approximately half the light emitted by the illumination system.
- the means for coupling out light are uniformly distributed over said sub-surfaces in such a manner that the light emitted by the sub-surfaces very uniformly illuminates the corresponding part of the imaginary projection area.
- a uniformly illuminated display device is obtained by arranging the sub-surfaces preferably on a part of the rear wall which is situated at a (maximum) distance from the light-transmitting edge-area.
- the light-transmitting edge areas are alternately situated at opposite sides of the panels.
- the sub-surface of one light-emitting panel illuminates one half of the display device, for example the lower half, while the sub- surface of the other light-emitting panel illuminates the other half of the display device, for example the upper half.
- the display screen of the display device is suitable for spatial sequential operation.
- a ridge is formed in one of the sub-surfaces or in both sub-surfaces, thereby effectively precluding the mixing of light between the two halves of the display device.
- the illumination system comprises three light- emitting panels, each of which couples out approximately one third of the light.
- a preferred, alternative embodiment of the illumination system in accordance with the invention is characterized in that the sub-surfaces extend over a substantial part of the rear wall of the light-emitting panels, the means for coupling out light being arranged such that the degree to which light is coupled out changes as a function of the distance to the light- transmitting edge area.
- the means for coupling out light are uniformly distributed over the subsurfaces, particularly the interfaces in the projection area between light originating from the various sub-surfaces are sensitive to misalignment of the light-emitting panels.
- the inventors have recognized that if the means for coupling out light are not uniformly distributed over the sub-surfaces, the degree to which light is coupled out changing as a function of the distance to the light-transmitting edge area, the light distribution over the imaginary projection area as a result of coupling out light by the light-emitting panels becomes less sensitive to obliqueness of the light-emitting panels or to a sub-optimal alignment of the light-emitting panels.
- the means are distributed over the entire rear wall of each of the light-emitting panels, the degree to which light is coupled out being comparatively small in the proximity of the light-transmitting edge areas, and comparatively large in the proximity of the opposite edge area.
- each one of the light-emitting panels contributes to the illumination of at least substantially the entire surface of the projection area, but the contribution to the illumination of the light-emitting panel in the proximity of the light-transmitting edge areas is so small that effects of the light source on the light coupled out by the panel are negligibly small.
- the degree to which each of the light-emitting panels contributes to the illumination of an imaginary point of the projection area depends substantially upon the position of said imaginary point in the projection area.
- the means for coupling out light are arranged such that the degree to which light is coupled out changes linearly as a function of the distance to the light-transmitting edge area.
- the means are arranged such that the coupling out of light changes as a square of a sine or a cosine.
- one of the light-emitting panels does not extend over the whole length of the projection area. This is suitable, in particular, if there is a lack of space on one of the two sides of the illumination system. This is the case, for example, if the connection wires for electrodes at edges of the LCD display device are diverted round the illumination system. The connection wires are customarily situated at two successive sides of the LCD display device. As a result, there is ample room for the light source of the illumination system at two of the sides of the display device, while there is comparatively less space at the other, opposite sides. By shortening one of the light-emitting panels, more space is created at the latter side of the display device.
- the light source comprises at least one light-emitting diode having a luminous flux of at least 5 lm.
- LEDs having such a high output are also referred to as LED power packages.
- the use of these high-efficiency, high-output LEDs has the specific advantage that, at a desired, comparatively high light output, the number of LEDs may be comparatively small. This has a positive effect on the compactness and efficiency of the illumination system to be manufactured. Further advantages of the use of LEDs are a comparatively very long service life, comparatively low energy costs and comparatively low maintenance costs of an illumination system comprising LEDs.
- a preferred embodiment of the illumination system in accordance with the invention is characterized in that a sensor for measuring the optical properties of the light emitted, in operation, by the light source is situated at the edge area of the light-emitting panels that is situated opposite the light-transmitting edge surface. If different types of LEDs are combined and/or LEDs of different colors are employed, colors can be mixed in a desirable manner, for example, to make white light of the desired color temperature. In addition, color changes can be brought about irrespective of the condition of the display device.
- the sensor can alternatively be provided on a different (edge) area of the light-emitting panel.
- the illumination system comprises control electronics for changing the luminous flux of the light source.
- Suitable control electronics enable the desired illumination effects to be obtained and the uniformity of the coupled-out light to be improved.
- a suitable combination of LEDs enables white light to be obtained, and a desired color temperature can be adjusted by means of control electronics.
- the light source comprises at least two light-emitting diodes having different light-emission wavelengths.
- Such diodes emit light in a predetermined wavelength range.
- the LEDs comprise preferably the combinations of red, green and blue LEDs which are known per se, or combinations of red, green, blue and amber LEDs.
- Fig. 1 A is a cross-sectional view of a display device comprising an embodiment of the illumination system in accordance with the invention
- Fig. IB is a perspective view of a detail of the illumination system shown in
- Fig. 2 is a cross-sectional view of an alternative embodiment of a display device comprising an alternative embodiment of the illumination system in accordance with the invention
- Fig. 3 A is a cross-sectional view of a detail of an alternative embodiment of the illumination system in accordance with the invention
- Fig. 3B is a cross-sectional view of a detail of a further, alternative embodiment of the illumination system in accordance with the invention
- Fig. 4A is a cross-sectional view of an alternative embodiment of the illumination system in accordance with the invention.
- Fig. 4B is a cross-sectional view of a further alternative embodiment of the illumination system in accordance with the invention.
- Fig. 1A is a cross-sectional view of an embodiment of an illumination system in accordance with the invention.
- the illumination system comprises a light-emitting panel 1 ; 11 of a light-transmitting material.
- the panel 1; 11 is made from, for example, a synthetic resin, acryl, polycarbonate, PMMA, such as Perspex, or glass.
- PMMA such as Perspex
- the panel 1 ; 11 has a front wall 2; 12 and a rear wall 3; 13 opposite said front wall. Between the front wall 2; 12 and the rear wall 3; 13 there are edge areas 4, 14; 5, 15.
- edge areas 4, 14; 5, 15 In the example shown in Fig.
- the edge area referenced 4; 14 is light-transmitting, and at least one light source 6; 16 is associated therewith. In operation, light originating from the light source 6; 16 is incident on the light-transmitting edge area 4; 14 and diffuses in the panel 1 ; 11.
- the illumination system comprises at least two light-emitting panels 1, 11, said panels 1, 11 being arranged one behind the other and at least substantially parallel to each other (also see Fig. IB).
- Sub-surfaces 8, 18 of the rear wall 3, 13 of each one of the light-emitting panels 1, 11 are provided with means for coupling light out of the panel 1, 11.
- These means comprise (patterns of) deformities and, for example, screen-printed dots, wedges and/or ridges.
- the means are provided, for example, by means of etching, scribing or sandblasting in the rear wall of the panel 1 , 11.
- the deformities are provided in the front wall 2, 12 of the panel 1, 11.
- the means couple light out of the panel 1, 11 by reflection, scattering and/or refraction.
- Said sub-surfaces 8, 18 of the light-emitting panels 1, 11 project, in operation, light on regions 9, 19 of an imaginary projection area 40 parallel to the light-emitting panels 1, 11.
- the projections of the light originating from the panels 1, 11 are diagrammatically indicated in Fig. 1 A by means of broken lines, the regions 9, 19 on the imaginary projection area 40 are indicated by means of brackets referenced 9 and 19, respectively.
- the projected areas 9, 19 demonstrate a small overlap in the projection area 40.
- the light source 6, 16 comprises a plurality of light-emitting diodes (LEDs) (see Fig.
- LEDs may contact panels made of a synthetic resin. LEDs hardly emit heat in the direction of the light-emitting panel 1 ; 11 and do not emit detrimental (UV) radiation.
- Fig. 1 A an optional diffuser 51 and a reflecting diffuser 52 are shown, which bring about further mixing of the light originating from the light-emitting panels 1; 11.
- Fig. 1 A further very diagrammatically shows a LCD panel, referenced 55.
- the assembly of the panels 1, 11, the light source 6, 16, the diffuser 51, the LCD panel 55 and a housing 50 forms a display device for displaying, for example, (video) images.
- each light-emitting panel 1, 11 is provided with a sensor 10, 20 for measuring the optical properties of the light which, in operation, is emitted by the light source 6, 16.
- This sensor 10, 20 is coupled to control electronics (not shown in Fig. 1 A) for suitably adapting and/or changing the luminous flux of the light source 6, 16.
- control electronics not shown in Fig. 1 A
- a feedback mechanism can be formed which is used to influence the quality and the quantity of the light coupled out of the panel 1, 11.
- Fig. IB is a very diagrammatic, perspective view of a detail of the illumination system shown in Fig. 1 A.
- Light originating from a plurality of LEDs 6, 6', 6", ...; 16, 16', 16", ... is coupled into the panel 1, 11 via the light-transmitting edge area 4, 14.
- the light is coupled out via sub-surfaces 8, 18 of the rear walls 3, 13 which are provided, for this purpose, with means for coupling light out of the panel 1, 11.
- LEDs of three different colors are used, namely red LEDs 6; 16, green LEDs 6'; 16' and blue LEDs 6"; 16".
- amber LEDs are used which have a comparatively high light output.
- the LEDs used preferably have a luminous flux of at least 5 lm. LEDs having such a high output are alternatively referred to as LED power packages. Examples of power LEDs are "Barracuda"-type LEDs ( Lumileds).
- the luminous flux per LED is 15 lm for red LEDs, 13 lm for green LEDs, 5 lm for blue LEDs and 20 lm for amber LEDs.
- "Prometheus"-type power LEDs Lumileds are used, having a luminous flux per LED of 35 lm for red LEDs, 20 lm for green LEDs, 8 lm for blue LEDs and 40 lm for amber LEDs.
- the LEDs are mounted on a (metal-core) printed circuit board.
- a (metal-core) printed circuit board PCB
- the heat generated by the LEDs can be readily dissipated by thermal conduction via the PCB.
- the (metal-core) printed circuit board is in contact with the housing of the display device via a heat-conducting connection.
- the means provided in the rear wall 3; 13 of the light-emitting panel 1; 11 serve as a secondary light source.
- a specific optical system may be associated with this second light source, which optical system may be provided, for example, on the front wall 2; 12 (not shown in Figs. 1A and IB).
- the optical system may be used, for example, to form a wide light beam.
- Fig. 2 shows, in cross-section, an alternative embodiment of a display device comprising an alternative embodiment of the illumination system in accordance with the invention.
- the illumination system comprises a light-emitting panel 101; 111; 121 of a light-transmitting material.
- the panel 101; 111; 121 has a front wall 102; 112; 122 and a rear wall 103; 113; 123 opposite said front wall.
- Edge areas 104, 105; 114, 115; 124, 125 are situated between the front wall 102; 112; 122 and the rear wall 103; 113; 123.
- the edge area bearing reference numeral 104; 114; 124 is light-transmitting, and at least one light source 106; 116; 126 is associated therewith.
- the embodiment of the illumination system in accordance with the invention as shown in Fig. 2 comprises three parallel light-emitting panels 101, 111, 121.
- Sub-surfaces 108, 118, 128 of the rear walls 103, 113, 123 of each one of the light-emitting panels 101, 111, 121 are provided with means for coupling light out of the panel 101, 111, 121.
- said sub-surfaces 108, 118, 128 project light on areas 109, 119, 129 of an imaginary projection surface 140 parallel to the light-emitting panels 101, 111, 121.
- the projections of the light originating from the panels 101, 111, 121 are diagrammatically shown in Fig. 2 by means of broken lines, the regions 109, 119, 129 on the imaginary projection surface 140 are indicated by means of brackets provided with the respective reference numerals 109, 119 and 129.
- the projected regions 109, 119, 129 demonstrate a small overlap in the projection surface 140.
- the light source 106; 116; 126 comprises a plurality of light- emitting diodes (LEDs).
- the LEDs are provided on the lower side of the panel 101, on the upper side of the panel 111 and again on the lower side of the panel 121.
- the light-transmitting edge areas 105, 115, 125 are situated alternately on opposite sides of the panels 101, 111, 121.
- Fig. 2 shows an optional diffuser 151 and a reflecting diffuser 152, which bring about further mixing of the light originating from the light-emitting panels 101; 111; 121.
- Fig. 2 also shows, very diagrammatically, a LCD panel referenced 155.
- the assembly of the panels 101, 111, 121, the light source 106, 116, 126, the diffuser 151, the LCD panel 155 and a housing 150 forms a display device for displaying, for example, (video) images.
- each light-emitting panel 101, 111, 121 is provided with a sensor
- Fig. 3 A is a diagrammatic, cross-sectional view of a detail of an alternative embodiment of the illumination system in accordance with the invention. With respect to Fig. 2, corresponding parts in Fig. 3 A have a reference numeral which is 100 higher.
- the illumination system comprises two parallel-arranged light-emitting panels 201, 211 having a front wall 202, 212 and a rear wall 203, 213.
- the edge areas bearing reference numeral 204, 214 are light-transmitting and associated with at least one light source 206, 216.
- the sub-surfaces 208, 218 comprise the entire rear wall 203, 213 of the light-emitting panels 201, 211.
- the drawing also diagrammatically shows that the means for coupling out light are arranged such that the degree to which light is coupled out changes linearly as a function of the distance to the light-transmitting edge surface 204, 214. In the proximity of the light source 206, 216, the amount of light coupled out is small, while in the proximity of the edge area 205, 215 situated opposite the light-transmitting edge area 204, 214, the amount of light coupled out is maximal. The light distribution over the
- (imaginary) projection surface (not shown in Fig. 3A) is caused everywhere by light which is coupled out of each one of the light-emitting panels, the contribution per light-emitting panel to the illumination of an (imaginary) point on the projection surface changing (substantially) from place to place.
- the light distribution over the projection surface due to the coupling out of light by the light-emitting panels is less sensitive to misalignment of said light-emitting panels.
- Fig. 3B is a diagrammatic, cross-sectional view of a detail of a further, alternative embodiment of the illumination system in accordance with the invention. With respect to Fig. 3 A, corresponding parts in Fig. 3B have reference numerals which are 100 higher.
- the illumination system comprises two parallel-arranged light-emitting panels 301 , 311 having a front wall 302, 312 and a rear wall 303, 313.
- the edge areas referenced 304, 314 are light-transmitting and associated with at least one light source 306, 316.
- the sub-surfaces 308, 318 comprise the entire rear wall 303, 313 of the light-emitting panels 301, 311.
- the drawing further very diagrammatically shows that the means for coupling out light are provided such that the coupling out of light as a function of the distance to the light-transmitting edge area 304, 314 changes for one of the light-emitting panels in accordance with the square of a sine, while the coupling out of light of the other light-emitting panel changes in accordance with the square of a cosine. Since the sum of the squares of the sine and the cosine is constant, a very uniform light distribution over the projection surface (not shown in Fig.
- the amount of light coupled out in the proximity of the light source 306, 316 is small, while the amount of light coupled out of the light-emitting panel in the proximity of the edge surface 305, 315 situated opposite the light-transmitting edge surface 304, 314 is maximal.
- the light distribution over the projection surface as a result of the coupling out of light by the light-emitting panels is less sensitive to misalignment of said light-emitting panels.
- Fig. 4 A is a diagrammatic, cross-sectional view of an alternative embodiment of the illumination system in accordance with the invention.
- the illumination system comprises two parallel-arranged light-emitting panels 401; 411, each having a front wall 402; 412 and a rear wall 403; 413 opposite said front wall.
- the edge surface referenced 404 is.light-transmitting and at least one light source 406 is associated therewith.
- the light source 406; 416 comprises a plurality of light-emitting diodes (LEDs).
- the illumination system is provided with a reflecting diffuser 442.
- Sub-surfaces 408, 418 of the rear walls 403, 413 of each one of the light- emitting panels 401, 411 are provided with means for coupling light out of the panel 401, 411.
- said sub-surfaces 408, 418 project light on regions 409, 419 of an imaginary projection surface 440 parallel to the light-emitting panels 401, 411.
- the projections of the light originating from the panels 401, 411 are diagrammatically shown in Fig. 4 A by means of broken lines, the regions 409, 419 on the imaginary projection area 440 are indicated by means of brackets provided with the respective reference numerals 409 and 419.
- Fig. 4 A The projections of the light originating from the panels 401, 411 are diagrammatically shown in Fig. 4 A by means of broken lines, the regions 409, 419 on the imaginary projection area 440 are indicated by means of brackets provided with the respective reference numerals 409 and 419.
- Fig. 4A is a diagrammatic, cross-sectional view of an alternative embodiment of the illumination system in accordance with the invention. With respect to Fig. 4A, corresponding parts in Fig. 4B have reference numerals which are 100 higher.
- the illumination system comprises two parallel-arranged light-emitting panels 501; 511, each having a front wall 502; 512 and a rear wall 503; 513 opposite said front wall.
- the edge area bearing reference numeral 504 is not light-transmitting but, preferably, provided with a reflecting coating.
- a part of the rear wall 503 of the panel is light-transmitting and at least one light source 506 is associated therewith, which light source is arranged, in this example, at right angles to the longitudinal axis of the light-emitting panel 501.
- the light source 506; 516 comprises, in this example, a plurality of light-emitting diodes (LEDs).
- the illumination system is provided with a reflecting diffuser 542.
- Sub-surfaces 508, 518 of the rear walls 503, 513 of each one of the light- emitting panels 501, 511 are provided with means for coupling light out of the panel 501, 511. In operation, said sub-surfaces 508, 518 project light on regions 509, 519 of an imaginary projection surface 540 parallel to the light-emitting panels 501, 511.
- the light-emitting panel referenced 501 is shorter than the light-emitting panel referenced 511.
- the part used for mixing the light originating from the light-emitting panel has become shorter, however, in the illumination system space has been obtained enabling, for example, connection wires for electrodes at edges of the LCD display device to be passed through said space and provided.
- the light source 506 is arranged at right angles to the longitudinal axis of the light-emitting panel 501, which leads to a further saving of space.
- the light source 516 is arranged at right angles to the longitudinal axis of the light-emitting panel 511.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
MXPA02000166A MXPA02000166A (en) | 2000-05-04 | 2001-04-17 | Illumination system and display device. |
EP01943255A EP1281023A1 (en) | 2000-05-04 | 2001-04-17 | Illumination system and display device |
KR1020027000092A KR20020041403A (en) | 2000-05-04 | 2001-04-17 | Illumination system and display device |
JP2001581028A JP2003532273A (en) | 2000-05-04 | 2001-04-17 | Lighting system and display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP00201604 | 2000-05-04 | ||
EP00201604.6 | 2000-05-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2001084046A1 true WO2001084046A1 (en) | 2001-11-08 |
Family
ID=8171443
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2001/004369 WO2001084046A1 (en) | 2000-05-04 | 2001-04-17 | Illumination system and display device |
Country Status (8)
Country | Link |
---|---|
US (1) | US6648486B2 (en) |
EP (1) | EP1281023A1 (en) |
JP (1) | JP2003532273A (en) |
KR (1) | KR20020041403A (en) |
CN (1) | CN1383480A (en) |
MX (1) | MXPA02000166A (en) |
TW (1) | TW514709B (en) |
WO (1) | WO2001084046A1 (en) |
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Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2002097324A1 (en) * | 2001-06-01 | 2002-12-05 | Lumileds Lighting U.S., Llc | Compact illumination system and display device |
JP2004303564A (en) * | 2003-03-31 | 2004-10-28 | Fujitsu Display Technologies Corp | Lighting system, and display device equipped with it |
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EP1555477A1 (en) * | 2004-01-15 | 2005-07-20 | Zumtobel Staff GmbH | Luminaire comprising light sources of different colours and a planar light guide for emitting mixed light |
US7656398B2 (en) | 2004-07-28 | 2010-02-02 | Mitsubishi Denki Kabushiki Kaisha | Surface light source device and liquid crystal display device |
EP1643278A1 (en) * | 2004-09-29 | 2006-04-05 | Minebea Co., Ltd. | Spread illuminating apparatus having two light conductive plates |
US7413334B2 (en) | 2005-05-17 | 2008-08-19 | Nec Lcd Technologies, Ltd. | Backlight and liquid crystal display device |
WO2008046394A2 (en) * | 2006-10-16 | 2008-04-24 | Osram Gesellschaft mit beschränkter Haftung | Lighting device |
WO2008046394A3 (en) * | 2006-10-16 | 2008-06-19 | Osram Gmbh | Lighting device |
EP1916549A1 (en) * | 2006-10-26 | 2008-04-30 | Minebea Co., Ltd. | Spread illuminating apparatus of multiple panel type |
US7588364B2 (en) | 2006-10-26 | 2009-09-15 | Minebea Co., Ltd. | Spread illuminating apparatus of multiple panel type |
US8011818B2 (en) | 2006-11-13 | 2011-09-06 | Cree, Inc. | Lighting device including plural optical structures having at least two different refraction indices, and lighting methods |
WO2008063989A1 (en) * | 2006-11-13 | 2008-05-29 | Cree Led Lighting Solutions, Inc. | Lighting device, illuminated enclosure and lighting methods |
US7806579B2 (en) | 2007-03-30 | 2010-10-05 | Honeywell International Inc. | Luminaire having a two-way waveguide |
US8142062B2 (en) | 2007-03-30 | 2012-03-27 | Honeywell International Inc. | Luminaire having a two-way waveguide |
WO2008141316A1 (en) * | 2007-05-16 | 2008-11-20 | Honeywell International Inc. | Luminaire having a two-way waveguide |
EP2390715A3 (en) * | 2007-07-29 | 2012-12-19 | Cree, Inc. | Led backlight system for lcd displays |
EP2390716A3 (en) * | 2007-07-29 | 2012-12-19 | Cree, Inc. | LED backlight system for LCD displays |
WO2009093131A1 (en) * | 2008-01-23 | 2009-07-30 | Kraslex, Ltd. | Illuminated signage and advertising display device |
EP2341376A1 (en) * | 2009-12-16 | 2011-07-06 | Samsung Electronics Co., Ltd. | Backlight unit and display apparatus having the same |
US8593393B2 (en) | 2009-12-16 | 2013-11-26 | Samsung Electronics Co., Ltd. | Backlight unit and display apparatus having the same |
DE102013000336A1 (en) * | 2013-01-11 | 2014-07-17 | Werma Holding Gmbh + Co. Kg | "Operating state warning light device" |
US9619978B2 (en) | 2013-01-11 | 2017-04-11 | Werma Holding Gmbh + Co. Kg | Operating status warning lamp apparatus |
EP4088060A4 (en) * | 2020-01-10 | 2024-01-31 | Hubbell Inc | Luminaire having edge-lit light panel with sub-surface optical features |
Also Published As
Publication number | Publication date |
---|---|
JP2003532273A (en) | 2003-10-28 |
TW514709B (en) | 2002-12-21 |
CN1383480A (en) | 2002-12-04 |
US20010038532A1 (en) | 2001-11-08 |
EP1281023A1 (en) | 2003-02-05 |
US6648486B2 (en) | 2003-11-18 |
MXPA02000166A (en) | 2004-08-12 |
KR20020041403A (en) | 2002-06-01 |
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