EP1960830A1 - Beleuchtungseinrichtung - Google Patents

Beleuchtungseinrichtung

Info

Publication number
EP1960830A1
EP1960830A1 EP06828696A EP06828696A EP1960830A1 EP 1960830 A1 EP1960830 A1 EP 1960830A1 EP 06828696 A EP06828696 A EP 06828696A EP 06828696 A EP06828696 A EP 06828696A EP 1960830 A1 EP1960830 A1 EP 1960830A1
Authority
EP
European Patent Office
Prior art keywords
light
lighting device
light module
emitting diode
light sources
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
EP06828696A
Other languages
German (de)
English (en)
French (fr)
Inventor
Simon BLÜMEL
Hubert Ott
Ludwig Plötz
Mario Wanninger
Günter KIRCHBERGER
Peter Wolff
Markus Zeiler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Ams Osram International GmbH
Original Assignee
Osram Opto Semiconductors GmbH
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 Osram Opto Semiconductors GmbH filed Critical Osram Opto Semiconductors GmbH
Publication of EP1960830A1 publication Critical patent/EP1960830A1/de
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
    • G02B19/0009—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only
    • G02B19/0014—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having refractive surfaces only at least one surface having optical power
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
    • G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
    • G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
    • G02B19/0061—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED
    • G02B19/0066—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a LED in the form of an LED array
    • 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
    • G02F1/133613—Direct backlight characterized by the sequence of light sources
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements

Definitions

  • a lighting device is specified.
  • a display device is provided with such a lighting device.
  • Lighting device the illumination device comprises at least one light module.
  • the light module comprises a printed circuit board and a plurality of groups of light sources which are applied to the printed circuit board.
  • the printed circuit board forms a connection carrier for the light sources.
  • the printed circuit board may, for example, comprise an electrically insulating basic body, on which conductor tracks are formed, which consist of an electrically conductive material.
  • the light sources of the light module are electrically contacted via the conductor tracks of the printed circuit board.
  • Each group of light sources of the light module comprises at least one light source, preferably at least two light sources, particularly preferably at least three light sources.
  • the light module comprises at least two groups of light sources, which are of similar design. These groups then comprise the same number of similar light sources.
  • the light sources of the same trained Groups are arranged in the same way to each other. That is, the light sources of two identically formed groups are arranged, for example, according to the same pattern.
  • Lighting device the at least one light module of the illumination device is mechanically attached to a support of the illumination device.
  • a plurality of similarly designed light modules is mounted on the carrier.
  • the light modules of the illumination device are arranged line by line on the carrier of the illumination device. Row by row means that each light module forms at least one line of the illumination device. In the line of the illumination device groups of light sources of the associated light module are arranged side by side in the horizontal direction. In the vertical direction, the light module is then followed by another light module, which forms another line of the illumination device.
  • Lighting device the lighting device on a plurality of light modules, each light module comprises a plurality of groups of light sources, which are applied to a circuit board of the light module, and the light modules are arranged line by line on a support of the illumination device.
  • At least one of the light modules of the illumination device is strip-shaped educated. Preferably, all light modules of the illumination device are then formed strip-shaped.
  • strip-shaped means that the length of the light module is greater than the width of the light module.
  • Strip-shaped may further mean that a plurality of groups of light sources in a main extension direction of the light module is arranged side by side on the circuit board of the light module.
  • the illumination device comprises at least a first light module and at least one second light module.
  • the first and the second light module are formed differently.
  • at least one group of light sources of the first light module is different to a corresponding group of light sources of the second light module.
  • corresponding groups of light sources are meant groups which are arranged at the same location in the light module.
  • the first and the second light module differ by different groups of light sources at the right and left outermost edges of the modules. These groups of light sources differ, for example, from the different arrangement of the light sources of the groups relative to each other.
  • the second light module emerges by a rotation of the first light module.
  • the second light module is generated from the first light module by a 180 degree rotation about an axis perpendicular to the main extension plane of the first light module. This means that the first and the second light module differ only by the orientation with which they are applied to the support of the lighting device.
  • the groups of light sources of the illumination device are arranged at the grid points of a regular grid.
  • the groups of light sources are centered to the grid points of the regular grid.
  • the geometric center of gravity of a group of light sources coincide with a grid point of the regular grid. This is then preferably the case for all groups of light sources of the illumination device.
  • the regular grid has one of the following grid structures: hexagonal, rhombic, rectangular, square, diamond-shaped.
  • each group of light sources comprises at least one light-emitting diode.
  • each group of light sources comprises at least two light-emitting diodes which are suitable for emitting light of different colors. That is, the group includes, for example, a first light emitting diode capable of emitting blue light, a second light emitting diode capable of emitting red light, and a third light emitting diode capable of emitting green light.
  • each of the groups is suitable for emitting white mixed light. That is, the light of the LEDs of each group of light sources mixes with white light.
  • At least one light source of the light module comprises a light-emitting diode.
  • the light-emitting diode preferably comprises a carrier and / or a housing, at least one light-emitting diode chip and an optical element which is arranged downstream of the light-emitting diode chip in its emission direction.
  • “Subordinate" means that a large part of the electromagnetic radiation emitted by the light-emitting diode chip passes through the optical element of the light-emitting diode and is optically manipulated by the optical element.
  • Lighting device comprises at least one light emitting diode of the illumination device for generating a light emitting diode chip and an optical element having an optical axis, wherein the optical element has a radiation exit surface and the
  • Radiation exit surface has a concave curved portion and a concave curved portion at a distance from the optical axis at least partially surrounding convexly curved portions, wherein the optical axis passes through the concave curved portion.
  • Such a shaping of the radiation exit surface of the optical element facilitates the change of the emission characteristic of the light-emitting diode, so that the radiation output coupled out of the light-emitting diode at an angle greater than zero is increased with respect to the emission characteristic of the light-emitting diode without an optical element.
  • the convexly curved subarea contributes to this, which increases the radiation component coupled out of the light emitting diode at large angles to the optical axis.
  • the LED with such an optical element is therefore for homogeneous illumination of a comparatively large, in particular flat surface particularly well suited in surface areas offset laterally to the optical axis.
  • the optical axis of the optical element extends through the light-emitting diode chip of the light-emitting diode.
  • the LED chip can be arranged centered in particular with respect to the optical axis. That is, for example, the optical axis passes through the geometric center of a radiation exit surface of the LED chip.
  • the optical axis of the optical element is then perpendicular to the radiation exit surface of the LED chip.
  • Such an arrangement of the light-emitting diode chip relative to the optical element facilitates homogeneous beam shaping of the electromagnetic radiation generated by the light-emitting diode chip by means of the optical element.
  • the optical element is designed rotationally symmetrical to the optical axis. As a result, an azimuthal to the optical axis homogeneous and uniform emission characteristics of the illumination device is achieved with advantage.
  • the light-emitting diode chip is formed at least one light source as Dünnfilmleuchtdiodenchip.
  • all light-emitting diode chips of the illumination device are designed as thin-film light-emitting diode chips. That is, the LED chips comprise an epitaxially grown layer sequence in which a growth substrate is either thinned or completely removed. The epitaxially grown layers of the layer sequence are then with their original growth substrate applied remote surface on a support or directly on the circuit board of the light module.
  • Thin-film optoelectronic semiconductor chips are described, for example, in the publications WO 02/13281 or EP 0905797, the disclosure content of which with regard to the thin-film construction of optoelectronic semiconductor chips is hereby expressly incorporated by reference.
  • the groups of light sources of the illumination device are preferably arranged such that the illumination device is suitable for illuminating a surface which is at a distance from the illumination device in the emission direction of the light sources with homogeneous white light.
  • the light sources of the illumination device are arranged on the edge of the illumination device in such a way that a periodic sequence of the light sources of different color results when the light sources arranged at the edge are passed over. This means, for example, that the following light-emitting diodes follow when passing over the edge-mounted light sources: red LED, green LED, blue LED, red LED, green LED, blue LED, red LED, and so on.
  • the edge of the surface to be illuminated is uniformly illuminated with each color, so that at the edge of a homogeneous mixture of light - preferably homogeneous white mixed light - results.
  • the display device comprises an imaging unit.
  • the imaging unit is For example, as an LCD panel (LCD - Liquid Crystal Display) running.
  • the imaging unit has a surface that is backlit by a lighting device as described in at least one of the embodiments.
  • the imaging unit is preferably backlit directly from the illumination device. That is, the imaging unit is arranged downstream of the illumination device in a radiation direction of the light sources of the illumination device. Subordinate means that at least a majority of the electromagnetic radiation emitted by the light sources impinges on the imaging unit.
  • the imaging unit is arranged parallel to the carrier of the illumination device.
  • FIG. 1 shows a schematic plan view of a first exemplary embodiment of a lighting device described here.
  • FIG. 2 shows a schematic plan view of a second exemplary embodiment of a lighting device described here.
  • FIG. 3 shows a schematic plan view of a third exemplary embodiment of a lighting device described here.
  • FIG. 4 shows a schematic plan view of a fourth exemplary embodiment of a lighting device described here.
  • FIG. 5 shows a schematic sectional view of a light-emitting diode 3 a as used in a light module 1 of the illumination device.
  • FIG. 6 shows a schematic perspective illustration of a section of a light module 1, as can be used in one of the exemplary embodiments of the illumination device described above.
  • FIG. 7 shows a schematic plan view of a fifth exemplary embodiment of a lighting device described here.
  • FIG. 8 shows a schematic plan view of a sixth exemplary embodiment of a lighting device described here.
  • FIG. 1 shows a schematic plan view of a first exemplary embodiment of a lighting device described here.
  • the illumination device comprises a plurality of light modules Ia, Ib.
  • Each light module Ia, Ib comprises a plurality of groups 2a, 2b, 20a, 20b of light sources.
  • the light sources are described in connection with FIG Embodiment formed by a respective blue light emitting diode 3 a, a red light emitting diode 3 c and a green light emitting diode 3 b per group.
  • the light modules Ia, Ib are strip-shaped.
  • the groups of light sources of each light module Ia and Ib are aligned along a straight line extending in the horizontal direction.
  • the light modules Ia, Ib of the illumination device are arranged line by line on a support 6 of the illumination device and mechanically fastened there.
  • the illumination device comprises first light modules Ia and second light modules Ib.
  • the first light modules Ia differ from the second light modules Ib by the groups 20a, 20b of light sources at the left and right edges of the illumination device.
  • the light module Ib emerges from the light module Ia by a 180 degree rotation about the axis A, which is perpendicular to a printed circuit board 4 of the light module. This means that the light modules Ia, Ib differ from each other only by their orientation on the support 6. In this way it is possible to produce the illumination device from otherwise identical light modules. This allows a particularly cost-effective mass production of the light modules.
  • first light modules Ia and second light modules Ib results in a lighting device in which red, green and blue light-emitting diodes are arranged alternately at the edge.
  • the light of the red, green and blue light-emitting diodes mixes with white light. Due to the alternating arrangement on the edge - see also the dashed line 21 - homogeneous white mixed light is also generated in the edge region.
  • the light-emitting diodes 3 a, 3 b, 3 c of the light modules 1 a, 1 b are applied to circuit boards 4.
  • the printed circuit boards 4 are, for example, printed circuit boards, flexible printed circuit boards or metal core boards.
  • FIG. 2 shows a schematic plan view of a second exemplary embodiment of a lighting device described here.
  • the light emitting diodes 3 a, 3 b, 3 c are partially arranged in groups 2, in which the light emitting diodes 3 a, 3 b, 3 c are arranged linearly, that is to say along a straight line.
  • the series arrangement of the light-emitting diodes 3a, 3b, 3c is possible in particular for mono- to tricolor groups 2 of light sources, since otherwise the color mixture is impaired.
  • FIG. 3 shows a top view of a third exemplary embodiment of one described here
  • the light-emitting diodes 3a, 3b, 3c of the groups 20a, 20b are linearly arranged in the edge region of the illumination device, but at certain angles relative to the groups 2 in the center of the illumination device - for example rotated by +/- 45 °.
  • FIG. 4 shows a plan view of a fourth exemplary embodiment of a lighting device described here.
  • the light modules Ia, Ib of the illumination device according to the fourth embodiment include red LEDs 3c and blue-green light-emitting diodes 3d.
  • the radiated light is partially converted by means of a luminescence conversion material.
  • the light-emitting diodes 3d comprise, for example, a light-emitting diode chip 300 which is suitable for generating light in the UV and / or blue spectral range.
  • the LED chip is a
  • the light-emitting diode 3d is suitable for emitting blue-green mixed light.
  • the groups 2 are arranged at the grid points GP of a rectangular grid G.
  • the geometric center of gravity GS of the group 2 - indicated in FIG. 4 by an X - is arranged on a grid point GP of the grid G.
  • FIG. 5 shows a schematic sectional view of a light-emitting diode 3 a as used in a light module 1 of the illumination device.
  • the light-emitting diode 3 a comprises a light-emitting diode chip 300. Furthermore, the light-emitting diode 3 a comprises an optical element 200.
  • a radiation exit surface 210 of the optical element 200 has a concavely curved partial region 50.
  • the optical axis 60 of the optical element 200 extends through the concavely curved subregion 50.
  • the optical element 200 has a convexly curved subregion 70 which surrounds the concavely curved subregion 50 at a distance from the optical axis 60.
  • the convexly curved portion 70 may be configured in accordance with a convex lens.
  • the concave Curved portion 50 may be implemented according to a concave lens.
  • Electromagnetic radiation generated in an active zone 303 of the light-emitting diode chip 300 enters the optical element 200 via a preferably flat radiation entrance surface 80.
  • the radiation generated by the light-emitting diode chip 300 in particular visible radiation-ie light-is illustrated in FIG. 5 by the lines marked with arrows which symbolize individual light beams.
  • the optical element 200 is designed for homogeneous illumination of a surface 90, such as a diffuser film or the imaging unit of a display device such as an LCD panel.
  • the optical axis 60 of the optical element 200 preferably extends through the surface 90.
  • the surface 90 preferably runs perpendicular or substantially perpendicular to the optical axis 60.
  • the optical axis 60 passes through the light-emitting diode chip 300.
  • the light-emitting diode chip 300 is preferably centered relative to the optical axis 60. In this case, the optical axis 60 is perpendicular to the active zone 303 of the light-emitting diode chip 300.
  • the light-emitting diode chip 300 is preferably a thin-film light-emitting diode chip as described above having a carrier 301 and a preferably epitaxially produced semiconductor body 302 comprising the active zone 303.
  • the growth substrate for the semiconductor body 302 is removed.
  • the carrier 301 is thus different from the growth substrate and does not have to meet the high requirements for a growth substrate, but can, with regard to further for the light-emitting diode chip 300 advantageous properties such as a high thermal conductivity are comparatively freely chosen.
  • FIG. 6 shows a schematic perspective illustration of a section of a light module 1, as can be used in one of the exemplary embodiments of the illumination device described above.
  • a group 2 of light-emitting diodes 3a, 3b and 3c is shown by way of example in greater detail.
  • Group 2 comprises two green light-emitting diodes 3b, a red light-emitting diode 3c and a blue light-emitting diode 3a.
  • the light emitting diodes 3a, 3b, 3c comprise an optical element 200, as described in connection with FIG.
  • the optical element 200 has a concave curved portion 50, which is completely circulated by a convexly curved portion 70.
  • the optical element 200 is formed rotationally symmetrical to the optical axis 60.
  • the optical element 200 is suitable for shaping the emission characteristic of the light-emitting diode such that the light-emitting diode illuminates a surface 90 which is at a distance from it in a particularly homogeneous manner. Due to the effect of the optical element 200, the generation of particularly homogeneous white mixed light is further favored.
  • the LEDs 3a, 3b, 3c are electrically contacted by means of two contact points 10, 11 with the printed circuit board 4.
  • the LEDs 3a, 3b, 3c of group 2 are arranged on grid points Sl of a regular grid S.
  • the grid points S1 preferably coincide with the piercing points of the optical axis 60 through the radiation exit surface 210 of the optical element 200 of each light emitting diode. Due to the rotational symmetry of the LEDs 3a, 3b, 3c, the grid points S coincide further with the geometric centers of the optical elements 200.
  • the distance between individual light emitting diodes 3a, 3b, 3c of a group 2 is preferably between 10 and 20 mm.
  • the distance between two adjacent groups 2 of light emitting diodes 3a, 3b, 3c is preferably between 30 and 100 mm.
  • FIG. 7 shows a schematic plan view of a fifth exemplary embodiment of a lighting device described here.
  • the light modules 1 a, 1 b are also arranged side by side in the lateral direction.
  • the light modules Ia, Ib - as in the embodiment described in connection with Figure 3 line by line on the support 6 of the lighting device and mechanically fixed there.
  • FIG. 8 shows a schematic plan view of a sixth exemplary embodiment of a lighting device described here.
  • the light-emitting diodes 3 a, 3 b, 3 c in this exemplary embodiment are each arranged in the manner of a cross.
  • the groups of light emitting diodes 3a, 3b and 3c are thus arranged as shown, for example, in the schematic perspective view of FIG. In this case, each group 2 of LEDs comprises two green LEDs 3b, a red LED 3c and a blue LED 3a.
  • the groups of light-emitting diodes 20a, 20b in the edge region of the light modules 1a, 1b are in the center relative to the groups 2 the light modules Ia, Ib rotated by certain angles. For example, they are rotated by + 45 °. It is also possible (not shown in Figure 8) that the light module Ib out of the light module Ia by a 180 degree rotation about an axis, which is perpendicular to a printed circuit board 4 of the light module.
EP06828696A 2005-12-16 2006-12-15 Beleuchtungseinrichtung Ceased EP1960830A1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102005060382 2005-12-16
DE102006033893.6A DE102006033893B4 (de) 2005-12-16 2006-07-21 Beleuchtungseinrichtung
PCT/DE2006/002266 WO2007076818A1 (de) 2005-12-16 2006-12-15 Beleuchtungseinrichtung

Publications (1)

Publication Number Publication Date
EP1960830A1 true EP1960830A1 (de) 2008-08-27

Family

ID=37964347

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06828696A Ceased EP1960830A1 (de) 2005-12-16 2006-12-15 Beleuchtungseinrichtung

Country Status (8)

Country Link
US (1) US7918574B2 (zh)
EP (1) EP1960830A1 (zh)
JP (1) JP5021671B2 (zh)
KR (1) KR101290136B1 (zh)
CN (1) CN101375202B (zh)
DE (1) DE102006033893B4 (zh)
TW (1) TWI309398B (zh)
WO (1) WO2007076818A1 (zh)

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KR20080080150A (ko) 2008-09-02
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TWI309398B (en) 2009-05-01
US7918574B2 (en) 2011-04-05
CN101375202A (zh) 2009-02-25
JP2009519568A (ja) 2009-05-14
KR101290136B1 (ko) 2013-07-26
CN101375202B (zh) 2012-09-05
TW200731176A (en) 2007-08-16
US20090213575A1 (en) 2009-08-27
DE102006033893A1 (de) 2007-06-28

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