WO2000038482A1 - Flache beleuchtungsvorrichtung und betriebsverfahren - Google Patents
Flache beleuchtungsvorrichtung und betriebsverfahren Download PDFInfo
- Publication number
- WO2000038482A1 WO2000038482A1 PCT/DE1999/003591 DE9903591W WO0038482A1 WO 2000038482 A1 WO2000038482 A1 WO 2000038482A1 DE 9903591 W DE9903591 W DE 9903591W WO 0038482 A1 WO0038482 A1 WO 0038482A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- light source
- guide plate
- lighting device
- light guide
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 10
- 230000004907 flux Effects 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 claims description 7
- 238000010168 coupling process Methods 0.000 claims description 7
- 238000005859 coupling reaction Methods 0.000 claims description 7
- 229910052724 xenon Inorganic materials 0.000 claims description 3
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 230000004888 barrier function Effects 0.000 claims 1
- 239000010410 layer Substances 0.000 description 11
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000004973 liquid crystal related substance Substances 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 1
- 229920005372 Plexiglas® Polymers 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000002346 layers by function Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229910000679 solder Inorganic materials 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/36—Controlling
- H05B41/38—Controlling the intensity of light
- H05B41/39—Controlling the intensity of light continuously
- H05B41/392—Controlling the intensity of light continuously using semiconductor devices, e.g. thyristor
-
- 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
- G02B6/0066—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 characterised by the light source being coupled to the light guide
- G02B6/007—Incandescent lamp or gas discharge lamp
- G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube
Definitions
- the invention relates to a flat lighting device according to the preamble of claim 1.
- the invention also relates to a method for operating this lighting device.
- the light of at least one light source is coupled into a light guide plate, for example through at least one narrow side (“edge”, “edge”) of the light guide plate (so-called “edge light technology”) Reflection, for example from suitable structures on the underside of the light guide plate, this light passes through the entire front side of the light guide plate and thus acts as a flat light source which is expanded in accordance with the dimensions of the light guide plate.
- LCD Liquid Crystal Display
- Liquid crystal displays are used in a variety of ways, for example in control rooms, cockpits of aircraft and increasingly also in motor vehicles, in entertainment electronics and as screens for personal computers (PCs).
- PCs personal computers
- a rod-shaped fluorescent lamp is arranged parallel to the corresponding next adjacent narrow side on two opposite narrow sides of the light guide plate.
- reflective structures are arranged on the back of the light guide plate and diffusely scattering on the front side of the light guide plate.
- a disadvantage of the prior art is that a The required sharp reduction in the luminance cannot be achieved only with the aid of a corresponding reduction in the electrical power coupled into the light sources, since either the color temperature of the light changes too much or the discharge becomes inhomogeneous or the operation of the light source becomes unstable or the light source even goes out suddenly.
- the invention further relates to a method for operating such a lighting device according to the method claim.
- a first light source is arranged adjacent to the light guide plate of the flat lighting device, and a second light source is arranged behind the first light source with respect to the light guide plate.
- the phrase "... arranged behind the first light source with respect to the light guide plate” does not mean that the light sources and the light guide plate should necessarily be arranged in a common plane. Rather, the lamps can also be offset from one another and with respect to the light guide plate the advantageous effect of the invention is only that at least some of the light emitted by the second light source passes through the first light source into the light guide plate, and there may also be an additional optical system known per se which correspondingly transmits the light through the individual components of the lighting device leads, required or at least helpful.
- the term “behind” - or, conversely, the counterpart “in front” - is to be referred to the path that the light rays of the second light source pass through the first light source into the li Put the circuit board back in.
- the first light source is now to be switched off and only the second light source is to be switched on or only to be switched on if necessary.
- the first light source acts as a scattering body and / or absorber and thus reduces the proportion of the actually coupled light flux and consequently the luminance of the light guide plate.
- all elongated electric lamps are suitable as light sources, in particular elongated fluorescent lamps, for example two rod-shaped fluorescent lamps which are oriented parallel to one another or also a single fluorescent lamp with two luminous parts which can be operated independently of one another, for example the two legs of a U-shaped fluorescent lamp with each leg being independent switchable electrodes.
- the separate switchability can be achieved particularly easily with dielectrically disabled electrodes, in particular electrodes arranged outside the discharge vessel of the fluorescent lamp.
- This type of lamp usually contains an inert gas, for example xenon, in its discharge vessel as the discharge medium.
- the dielectrically impeded discharge produces excimers, for example Xe 2 *, which generate electromagnetic radiation, in particular UV / VUV radiation, which may be transformed into visible light by means of phosphor (s).
- excimers for example Xe 2 *, which generate electromagnetic radiation, in particular UV / VUV radiation, which may be transformed into visible light by means of phosphor (s).
- the first light source is preferably provided with a first aperture, which in the simplest case, i.e. without the use of additional optical elements facing the light guide plate. With the aid of the aperture and possibly other optical elements, the light is emitted in a targeted manner in the direction of the light guide plate. Improved efficiency can thus be achieved in normal operation.
- the aperture can be realized either by partially omitting the fluorescent material or by at least applying a thinner layer than the rest of the wall of the lamp.
- the degree of lowering of the luminance by the scattering and / or absorption effect of the first light source can be determined by the width of one influence second aperture, which is arranged along the first light source and facing the second light source.
- the light from the second light source then preferably passes through this second aperture into the first light source and from there to the light guide plate.
- the second aperture thus acts as a slit-shaped diaphragm for the light that is coupled into the first light source from the second light source.
- the second aperture is narrower than the first aperture.
- this causes a strong spread, i.e. significant dimming, and on the other hand achieved a high efficiency of the first lamp in the undimmed state.
- the wall of the lamp can also have a layer for reflecting visible light, the aforementioned apertures being left out of this reflective layer or at least sufficiently thin in these areas.
- normal operation For operation with high luminance of the light guide plate, hereinafter referred to as “normal operation”, at least the first light source is switched on, optionally the second light source is also switched on.
- a certain dimming can already be achieved by coupling the power into the first light source is reduced in a manner known per se, this type of dimming, as already mentioned at the beginning certain limits are set and therefore should not be further problematized here.
- the first light source is switched off, while the second light source remains switched on or, if appropriate, is only switched on.
- the method according to the invention also provides the possibility of starting directly in dimming operation, i.e. starting from a state in which both lamps are switched off, switch on the second lamp immediately.
- the luminous flux of the second light source that is coupled into the light guide plate is weakened by the first, switched-off light source, or by scattering and / or absorption.
- the weakening or scattering effect of the first light source and thus the actually coupled light component and ultimately the luminance of the light guide plate can, as already explained further above, be influenced by the specific design of the first light source, in particular by means of the second aperture.
- the second light source is a conventional rod-shaped fluorescent lamp without an aperture.
- the first light source is preferably an aperture fluorescent lamp.
- Figure la is a flat lighting device
- FIG. 1b shows a sectional illustration of the flat lighting device from FIG. 1 a
- Figure 2 shows a variant of a flat lighting device.
- FIGS la, lb show a schematic plan view or sectional view along the line AA, a flat lighting device 1 according to the invention for the backlighting of liquid crystal displays (not shown), consisting of a light guide plate 2, a double-aperture fluorescent lamp 3, a second fluorescent lamp 4 and two electronic ballasts 5, 6 (hereinafter referred to as "EVG") for the operation of the two lamps 3, 4.
- EDG electronic ballasts 5, 6
- a first 7 of the four narrow sides of the light guide plate 2 is referred to below for the sake of simplicity as the "light entry edge”.
- the double-aperture fluorescent lamp 3 is arranged directly parallel to the light entry edge 7 of the light guide plate 2.
- the lamp 3 consists of a tubular discharge vessel 8, two electrodes 9, 10 and a functional layer system.
- the layer system consists of a reflection layer 11 made of Ti0 2 and a phosphor layer 12 made of a three-band phosphor.
- the three-band phosphor consists of a mixture of the blue component BaMgAhoO ⁇ Eu, the green component LaP0: Ce, Tb and the red component (Y, Gd) B0 3 : Eu.
- the dimensions of the respective widths B, b of the two apertures 13, 14 ensure, on the one hand, efficient use of the light generated by the double-aperture fluorescent lamp 3 for normal operation and, on the other hand, a significant attenuation of the light generated by the second fluorescent lamp 4.
- the first aperture 13 faces the light guide plate 2, and the second aperture 14 faces the second fluorescent lamp 4 arranged behind the double-aperture fluorescent lamp 3.
- the phosphor layer 12 is applied on the reflection layer 11 or in the area of the apertures 13, 14 directly on the inner wall of the discharge vessel 8.
- the outer diameter of the discharge vessel 8 made of glass is approximately 14 mm with a wall thickness of approximately 0.5 mm.
- the length of the tubular discharge vessel 8, which is sealed gas-tight at both ends with a dome (15 or not shown) formed from the vessel material, is approximately 27 cm.
- Xenon is located within the discharge vessel 8 with a filling pressure of approximately 17 kPa.
- the two Electrodes 9, 10 are designed as metal strips, which are arranged on the inner wall of the discharge vessel 8 parallel to the longitudinal axis of the tube and diametrically opposite one another.
- both electrodes 9, 10 are covered with a dielectric layer 16 made of glass solder.
- the lamp is provided with a base 17 at one end.
- the base 17 has two connecting pins 18a, 18b, which are connected to the two electrodes 9, 10.
- the fluorescent lamp 4 is - with respect to the light guide plate 2 - arranged behind the double-aperture fluorescent lamp 3. Identical features are provided with the same reference symbols.
- the two elongated electrodes 19, 20 are attached to the outer wall of the discharge vessel 8 here.
- the fluorescent lamp 4 has no reflection layer and no aperture.
- the two electronic ballasts are connected via leads 21a, 21b to the corresponding connection pins 18a, 18b of the two lamps 3, 4 and enable independent operation with active power pulses separated by pauses in accordance with WO-A-94/23442 already cited.
- a circuit arrangement suitable for this can be found, for example, in EP-A-0 781 078.
- the double-aperture fluorescent lamp 3 In dimming mode, the double-aperture fluorescent lamp 3 is switched off and the second fluorescent lamp 4 arranged behind it is switched on by means of the electronic ballast 6. switches. As a result, the double-aperture fluorescent lamp 3 acts as a diffuser for the light which is coupled into the light guide plate 2 by the fluorescent lamp 4. Consequently, the luminance on the front side 22 of the light guide plate 2 is significantly lower than in normal operation.
- FIG. 2 shows a variant of the flat lighting device from FIG. Identical features are provided with the same reference symbols.
- the double-aperture fluorescent lamp 3 and the fluorescent lamp 4 are realized here by the two legs 23 and 24 of a single U-shaped fluorescent lamp 25.
- two line-like electrodes 26a (26b not visible) and 27a (27b not visible) are arranged diametrically in pairs.
- the fluorescent lamp 25 has at its end a base 28 which is provided with four connecting pins 29a, b and 30a, b for the respective electrodes 26a, 26b and 27a, 27b.
- the first light source formed by means of the first leg 23 is fed by the first ballast 5
- the second light source formed by means of the second leg 24 is fed by the second ballast 6.
- the functioning of this variant corresponds to that described under FIGS. 1 a, b.
- the proposed teaching can also be applied to more than one “light entry edge” of the light guide plate without the advantageous effect of the invention being lost. Rather, light coupling over two, three or even four “light entry edges” can even achieve a finer graded dimming, however, with a corresponding additional outlay on lamps.
- the individual lamp can be curved, for example L-shaped or U-shaped, such that it runs along more than one, namely two or three “edges”. All of these variants are expressly claimed.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Discharge Lamp (AREA)
- Vessels And Coating Films For Discharge Lamps (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000590436A JP2002533885A (ja) | 1998-12-21 | 1999-11-11 | 平面形照明装置及び点灯方法 |
EP99960894A EP1072173A1 (de) | 1998-12-21 | 1999-11-11 | Flache beleuchtungsvorrichtung und betriebsverfahren |
US09/622,476 US6390637B1 (en) | 1998-12-21 | 1999-11-11 | Flat lighting device and method for operating |
CA002320760A CA2320760A1 (en) | 1998-12-21 | 1999-11-11 | Flat lighting device, and an operating method |
KR1020007009216A KR20010041166A (ko) | 1998-12-21 | 1999-11-11 | 평면 조명 장치 및 작동 방법 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19858810.0 | 1998-12-21 | ||
DE19858810A DE19858810A1 (de) | 1998-12-21 | 1998-12-21 | Flache Beleuchtungsvorrichtung und Betriebsverfahren |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000038482A1 true WO2000038482A1 (de) | 2000-06-29 |
Family
ID=7891799
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1999/003591 WO2000038482A1 (de) | 1998-12-21 | 1999-11-11 | Flache beleuchtungsvorrichtung und betriebsverfahren |
Country Status (8)
Country | Link |
---|---|
US (1) | US6390637B1 (de) |
EP (1) | EP1072173A1 (de) |
JP (1) | JP2002533885A (de) |
KR (1) | KR20010041166A (de) |
CA (1) | CA2320760A1 (de) |
DE (1) | DE19858810A1 (de) |
TW (1) | TW522207B (de) |
WO (1) | WO2000038482A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003036817A (ja) * | 2001-07-10 | 2003-02-07 | Patent Treuhand Ges Elektr Gluehlamp Mbh | 誘電体バリア放電ランプ |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI110636B (fi) * | 2001-06-29 | 2003-02-28 | Teknoware Oy | Järjestely valaisimen yhteydessä ja valaisin |
JP2009199734A (ja) * | 2008-02-19 | 2009-09-03 | Ushio Inc | 希ガス蛍光ランプ |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5311104A (en) * | 1990-12-03 | 1994-05-10 | Alliedsignal Inc. | Wide dimming range gas discharge lamp drive system |
WO1995012964A1 (en) * | 1993-11-03 | 1995-05-11 | Science Applications International Corporation | High efficiency uv backlighting system for rear illumination of electronic display devices |
US5420481A (en) * | 1993-09-27 | 1995-05-30 | Smiths Industries | Fluorescent lamp with wide range of luminous intensities |
US5537296A (en) * | 1993-11-05 | 1996-07-16 | Kimura; Yasuhiro | Backlight for liquid crystal display and liquid crystal display |
US5649754A (en) * | 1992-10-02 | 1997-07-22 | Photo Craft Co., Ltd. | Illuminating apparatus and a method of manufacturing an edge light conductor for use therein |
EP0798507A1 (de) * | 1992-07-13 | 1997-10-01 | Seiko Epson Corporation | Flächenhafte Beleuchtungsvorrichtung und Flüssigkristallanzeige |
EP0969311A1 (de) * | 1998-06-29 | 2000-01-05 | Minebea Co., Ltd. | Ausgedehnte Beleuchtungseinrichtung |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5816677A (en) * | 1905-03-01 | 1998-10-06 | Canon Kabushiki Kaisha | Backlight device for display apparatus |
GB8816952D0 (en) * | 1988-07-15 | 1988-08-17 | Emi Plc Thorn | Display device |
JP2692025B2 (ja) * | 1992-01-24 | 1997-12-17 | スタンレー電気株式会社 | 面状発光体装置 |
DE4311197A1 (de) | 1993-04-05 | 1994-10-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Verfahren zum Betreiben einer inkohärent strahlenden Lichtquelle |
DE19548003A1 (de) | 1995-12-21 | 1997-06-26 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Schaltungsanordnung zur Erzeugung von Impulsspannungsfolgen, insbesondere für den Betrieb von dielektrisch behinderten Entladungen |
DE19709268C1 (de) * | 1997-03-06 | 1998-08-20 | Bosch Gmbh Robert | Beleuchtungseinheit |
KR100432434B1 (ko) * | 1997-12-11 | 2005-01-13 | 이치코 고교가부시키가이샤 | 컬러표시장치 |
-
1998
- 1998-12-21 DE DE19858810A patent/DE19858810A1/de not_active Withdrawn
-
1999
- 1999-11-11 JP JP2000590436A patent/JP2002533885A/ja active Pending
- 1999-11-11 EP EP99960894A patent/EP1072173A1/de not_active Withdrawn
- 1999-11-11 US US09/622,476 patent/US6390637B1/en not_active Expired - Lifetime
- 1999-11-11 CA CA002320760A patent/CA2320760A1/en not_active Abandoned
- 1999-11-11 WO PCT/DE1999/003591 patent/WO2000038482A1/de not_active Application Discontinuation
- 1999-11-11 KR KR1020007009216A patent/KR20010041166A/ko not_active Application Discontinuation
- 1999-11-26 TW TW088120726A patent/TW522207B/zh not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5311104A (en) * | 1990-12-03 | 1994-05-10 | Alliedsignal Inc. | Wide dimming range gas discharge lamp drive system |
EP0798507A1 (de) * | 1992-07-13 | 1997-10-01 | Seiko Epson Corporation | Flächenhafte Beleuchtungsvorrichtung und Flüssigkristallanzeige |
US5649754A (en) * | 1992-10-02 | 1997-07-22 | Photo Craft Co., Ltd. | Illuminating apparatus and a method of manufacturing an edge light conductor for use therein |
US5420481A (en) * | 1993-09-27 | 1995-05-30 | Smiths Industries | Fluorescent lamp with wide range of luminous intensities |
WO1995012964A1 (en) * | 1993-11-03 | 1995-05-11 | Science Applications International Corporation | High efficiency uv backlighting system for rear illumination of electronic display devices |
US5537296A (en) * | 1993-11-05 | 1996-07-16 | Kimura; Yasuhiro | Backlight for liquid crystal display and liquid crystal display |
EP0969311A1 (de) * | 1998-06-29 | 2000-01-05 | Minebea Co., Ltd. | Ausgedehnte Beleuchtungseinrichtung |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003036817A (ja) * | 2001-07-10 | 2003-02-07 | Patent Treuhand Ges Elektr Gluehlamp Mbh | 誘電体バリア放電ランプ |
Also Published As
Publication number | Publication date |
---|---|
CA2320760A1 (en) | 2000-06-29 |
TW522207B (en) | 2003-03-01 |
JP2002533885A (ja) | 2002-10-08 |
KR20010041166A (ko) | 2001-05-15 |
DE19858810A1 (de) | 2000-06-29 |
EP1072173A1 (de) | 2001-01-31 |
US6390637B1 (en) | 2002-05-21 |
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