EP1004137B1 - Lampe a decharge avec electrodes inhibees dielectriquement - Google Patents

Lampe a decharge avec electrodes inhibees dielectriquement Download PDF

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Publication number
EP1004137B1
EP1004137B1 EP99934474A EP99934474A EP1004137B1 EP 1004137 B1 EP1004137 B1 EP 1004137B1 EP 99934474 A EP99934474 A EP 99934474A EP 99934474 A EP99934474 A EP 99934474A EP 1004137 B1 EP1004137 B1 EP 1004137B1
Authority
EP
European Patent Office
Prior art keywords
layer
discharge
discharge lamp
glass
electrodes
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.)
Expired - Lifetime
Application number
EP99934474A
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German (de)
English (en)
Other versions
EP1004137A2 (fr
Inventor
Michael Seibold
Michael Ilmer
Angela Eberhardt
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Publication of EP1004137A2 publication Critical patent/EP1004137A2/fr
Application granted granted Critical
Publication of EP1004137B1 publication Critical patent/EP1004137B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/24—Manufacture or joining of vessels, leading-in conductors or bases
    • H01J9/245—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps
    • H01J9/247—Manufacture or joining of vessels, leading-in conductors or bases specially adapted for gas discharge tubes or lamps specially adapted for gas-discharge lamps

Definitions

  • the invention relates to a discharge lamp according to the preamble of claim 1.
  • discharge lamp includes sources of electromagnetic radiation based on gas discharges.
  • the spectrum of radiation can include both the visible range and the UV (ultraviolet) / VDV (vacuum ultraviolet) range and the IR (infrared) range.
  • UV ultraviolet
  • VDV vacuum ultraviolet
  • IR infrared
  • dielectrically impeded electrodes are typically realized in the form of thin metallic strips, of which at least one part is arranged on the inner wall of the discharge vessel. At least a part of these inner wall electrodes is completely covered with respect to the interior of the discharge vessel with a dielectric barrier layer.
  • a so-called single-sided dielectrically impeded discharge forms in the preferably unipolar mode.
  • At least one further functional layer is applied to the dielectric barrier layer, and generally also to other parts of the inner wall of the discharge vessel, e.g. a layer of a phosphor or phosphor mixture and / or one or more reflective layers for visible radiation (light) and / or UV radiation.
  • the reflection layer serves the purpose of deliberately bringing visible light to the outside, i. only in a certain preferred direction of the lamp.
  • the geometric shape of the discharge vessel is not particularly limited. Common are, for example, tubular or flat discharge vessels, the latter are u.a. suitable as so-called flat lamps for the backlighting of liquid crystal displays (LCD).
  • LCD liquid crystal displays
  • the starting materials for both the reflector and the phosphor layer or layers are initially present as a powder in a suitable particle size. These powders are then applied as a suspension, usually mixed with an organic binder, in a defined layer thickness to the inner wall of the lamp or to the previously applied other functional layers, for example electrodes and dielectric barrier layer.
  • the layer thickness of the reflector or phosphor layer is controlled by the viscosity of the suspension, adapted to the respective coating method. After drying and baking, the reflector and / or phosphor layer are present as a porous powder layer or layers.
  • the dielectric barrier layer usually consists of glass frits, preferably lead borosilicate glass (Pb-B-Si-0).
  • the discharge vessels each consist of a substantially planar base glass, a just such front glass and optionally a frame
  • the base glass is provided with a so-called solder edge, which also consists of a glass frit, preferably Pb-B-Si-0.
  • This solder edge has the task of vacuum-tightly connecting the components of the discharge vessel (base glass, frame, front glass) during the joining process.
  • a temperature treatment in which the solder edge defined "melted", d. H. a defined viscosity is achieved.
  • that layer which is arranged substantially directly below the phosphor or reflection layer of the discharge lamp consists of a glass solder whose viscosity profile is irreversible with respect to the temperature. This feature is explained in more detail below. For the sake of simplicity, this layer will hereinafter also be referred to as a “supporting” layer or "anti-ice sheet layer”.
  • Substantially immediately below the phosphor or reflection layer of the discharge lamp in this context means that between the "supporting" layer and the porous phosphor or reflection layer should be possible no further layer, possibly only a very thin.
  • the maximum permissible thickness of an additional layer depends on the condition that the porous phosphor or reflection layer arranged directly above it during heating of the lamp (heating, joining process, etc.) must not be torn open by excessive "movement" due to softening of the additional layer , Depending on the nature and composition of the thickness of an additional layer should not exceed 100 microns, better 50 microns, typically 10 microns, ideally 5 microns.
  • the "supporting" layer is preferably immediately below the phosphor or Reflection layer arranged, ie without any additional layer between "supporting" layer and phosphor or reflective layer.
  • This "supporting” layer (“anti-ice floe layer”) can be realized either by the barrier layer acting as a dielectric barrier for the discharge itself or by an intermediate layer arranged between the dielectric barrier layer on the one hand and the reflective and / or phosphor layer on the other hand.
  • This intermediate layer should cover at least the entire dielectric barrier layer, but can also be applied "over the entire surface". For the effect according to the invention, it has proved to be sufficient if the thickness of this "supporting" intermediate layer is of the order of magnitude of approximately 10 ⁇ m or more.
  • the application of the typically pasty system is carried out by standard methods such as spraying, dispensing, rolling, screen or stencil printing, etc.
  • the dielectric barrier layer can be applied to the individual electrodes in strips (for one-sided and two-sided dielectric hindrance) as well as - in the case of double-sided dielectrically impeded discharge - "over the entire surface" by means of a single coherent barrier layer which covers all inner wall electrodes.
  • the choice of the appropriate thickness of the barrier layer is determined substantially by discharge physical requirements and is typically of the order of 10 ⁇ m to several hundred ⁇ m, more preferably between 50 ⁇ m and 200 ⁇ m, typically between 80 ⁇ m and 180 ⁇ m.
  • the thickness of the barrier layer (s) for anodes or cathodes can also be chosen differently.
  • unipolar pulsed operation WO94 / 23442
  • the blocking layer for the anodes is thicker than that for the cathodes, but the layer thicknesses can also be the same.
  • the advantage of the first solution i. the dielectric barrier layer is simultaneously designed as a "supporting" layer ("anti-ice sheet layer”), essentially consists in that no additional manufacturing or printing step is required.
  • the solution with the additional intermediate layer offers an additional degree of freedom for the selective choice of material of the dielectric barrier layer, in particular with regard to the dielectric and electrical properties influencing the discharge.
  • the behavior of the glass solders usually used as the supporting glass layer for the porous layers will first be explained. Normally, as with Pb-B-Si-O glasses, the viscosity decreases with increasing temperature. This behavior is reproducible unless the temperature was so high that devitrification already takes place. Reproducible means that the temperature range in which the glass softens at a defined viscosity, even with repetitions, i. after each corresponding previous cooling, is almost constant.
  • the glass solders proposed according to the invention do not show this behavior. Rather, their viscosity curve is irreversible with respect to temperature. Although initially the viscosity decreases with increasing temperature. After that, however, an increase in viscosity takes place - even if the temperature continues to rise.
  • Sinterglaskeramik is characterized in that it begins to soften at a subsequent temperature treatment now only at higher temperatures, typically about 50-100 ° C and more higher temperatures.
  • crystallizing glass solder bismuth borosilicate glass (Bi-B-Si-0) has been found.
  • Further suitable crystallizing glass solders are, for example, zinc bismuth borosilicate glass (Zn-Bi-B-Si-O) and zinc borosilicate glass (Zn-B-Si-O).
  • FIGS. 1a, 1b and 1c show a schematic representation of a plan view, a side view and a partial section along the line AA of a flat fluorescent lamp which emits white light during operation. It is designed as a backlight for an LCD (Liquid Crystal Display).
  • LCD Liquid Crystal Display
  • the flat lamp 1 consists of a flat discharge vessel 2 with a rectangular base, four strip-like metallic cathodes 3,4 (-) and anodes (+), of which three are designed as elongated double anodes 5 and two as individual strip-like anodes 6.
  • the discharge vessel 2 in turn consists of a base plate 7, a front plate 8 and a frame 9. Base plate 7 and front plate 8 are respectively connected by means of glass solder 10 to the frame 9 gas-tight so that the interior 11 of the discharge vessel 2 is cuboidal.
  • the base plate 7 is larger than the front plate 8 such that the discharge vessel 2 has a circumferential freestanding edge.
  • the breakthrough in the front panel 8 is for illustrative purposes only and gives a view of a portion of the cathodes 3,4 and 5,6 anodes free.
  • the cathodes 3, 4 and anodes 5, 6 are arranged alternately and parallel on the inner wall of the base plate 7.
  • the anodes 6, 5 and cathodes 3, 4 are each extended at one end and guided on both sides on the base plate 7 from the interior 11 of the discharge vessel 2 to the outside.
  • the electrode strips 3, 4, 5, 6 go over into a respective cathode-side 13 or anode-side 14, bus-like external power supply.
  • the two outer power leads 13,14 serve as contacts for connection to an electrical supply source (not shown).
  • the electrodes 3-6 are completely covered with a sintered glass ceramic layer 61 made of Bi-B-Si-O (see FIG. Figure 1c ), whose thickness is about 250 microns. On the one hand, this layer counteracts the formation of "ice floes". On the other hand, the sintered glass ceramic layer 61 simultaneously acts as a dielectric barrier layer for all electrodes 3-6. This is therefore a bilateral dielectric hindrance.
  • a reflector layer 62 of TiO 2 is applied, the thickness of which is approximately 4 ⁇ m.
  • a phosphor mixture layer 63 is applied (the layers are in FIG.
  • FIG. 1a not shown for the sake of clarity; see. Figure 1c ) which converts the UV / VUV radiation produced by the discharge into visible white light. It is a three-band phosphor with the blue component BAM (BaMgAl 10 O 17 : Eu 2+ ), the green component LAP (LaPO 4 : [Tb 3+ , Ce 3+ ]) and the red component YOB ([Y, Gd] BO 3 : Eu 3+ ).
  • the thickness of the phosphor mixture layer 63 is approximately 30 ⁇ m.
  • the electrodes 3-6 including feedthroughs and external power supply lines 13, 14 are in each case formed as a contiguous cathode-side or anode-side, conductor track-like layer-like structure. These two layered structures as well as the other functional layers following thereafter - dielectric barrier layer 61, reflection layer 62 and phosphor layer 63 are applied directly to the base plate 7 or front plate 8 by screen printing technology.
  • the base plate 7 is fused to the frame 9 and this in turn to the front plate 8 in each case by means of glass solder 10 to the complete flat lamp 1.
  • the joining process takes place, for example, in a vacuum oven.
  • the interior 11 of the flat lamp 1 is filled with xenon at a filling pressure of 10 kPa.
  • the two anode strips 5a, 5b of each anode pair 5 are widened in the direction of the two edges 15, 16 of the flat lamp 1, which are oriented perpendicularly to the electrode strips 3-6, namely asymmetrically exclusively in the direction of the respective partner strip 5b or 5a.
  • the mutual largest distance between the two strips of each anode pair 5 is about 4 mm, the smallest distance is about 3 mm.
  • the two individual anode strips 6 are each arranged in the immediate vicinity of the two edges 17, 18 of the flat lamp 1 that are parallel to the electrode strips 3-6.
  • the cathode strips 3, 4 have nose-like, the adjacent anode 5, 6 facing semi-circular projections 19. They cause locally limited gains of the electric field and consequently that in accordance with the operation WO 94/23442 resulting delta-shaped single discharges (in FIG. 1a not shown) ignite exclusively at these points.
  • the distance between the extensions 19 and the respective immediately adjacent anode strip is approximately 6 mm.
  • the radius of the semicircular extensions 19 is about 2 mm.
  • FIG. 2 shows a partial sectional view of a variant of the flat lamp FIG. 1a along the line AA. Identical features are provided with the same reference numerals.
  • an additional 12 ⁇ m thick intermediate layer 64 of Bi-B-Si-O is arranged between the dielectric barrier layer 61 'and the reflective layer 62.
  • the dielectric barrier layer 61 'here consists of lead borosilicate glass. The function of the crystallizing layer, which prevents the formation of "ice floes", is therefore taken over here by the intermediate layer 64.
  • a further reflection layer made of Al 2 O 3 is arranged between the TiO 2 layer and the phosphor layer. In this way, the reflection effect is improved.
  • the thickness of the Al 2 O 3 layer is approximately 5 ⁇ m.
  • FIGS. 1c and 2 layers that are shown as highly schematically do not necessarily have to be extended over the entire surface of the base plate. It is only important that at least the relevant electrode is completely covered with the corresponding layers. In the case of one-sided dielectric hindrance, only the electrodes of one polarity, preferably the anodes, are covered with a "supporting" dielectric layer.
  • the individual layers do not necessarily have to be completely flat, as shown in the FIGS. 1c and 2 is shown simplistic. Rather, the individual layers, in particular the very thin layers, may in practice also be uneven. This is particularly evident when one or more layers are thinner than the electrodes and the layer (s) consequently still recognizably image the surface shape of the base plate with the electrodes.
  • a tubular aperture lamp is a tubular aperture lamp.
  • the phosphor is applied here by means of flocking to the inner wall or the functional layers previously arranged thereon.
  • the basic order and function of the individual functional layers, in particular the effect according to the invention of the "supporting" layer, which prevents "ice floe formation", correspond to those of FIG. 1 ,

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Claims (5)

  1. Lampe (1) à décharge, qui convient pour le fonctionnement au moyen d'une décharge rendue incomplète par voie diélectrique et qui comprend
    • une enceinte (2) de décharge, constituée au moins en partie d'un matériau non conducteur de l'électricité,
    • des électrodes (3 à 6) qui sont disposées sur la paroi (7) de l'enceinte (2) de décharge,
    • au moins une couche (10 ; 61 ; 61' ; 64) diélectrique qui recouvre au moins une partie des électrodes (3 à 6) et éventuellement en plus la paroi (7) de l'enceinte de décharge,
    • une couche de substance (63) luminescente et/ou réfléchissante (62), qui recouvre la au moins une couche (10 ; 61 ; 61' ; 64) diélectrique,
    caractérisée en ce que
    au moins la couche (10 ; 61 ; 61' ; 64) diélectrique disposée sensiblement juste en dessous de la couche (62) de substance luminescente ou réfléchissante est en brasure pour du verre, dont la courbe de viscosité par rapport à la température est irréversible.
  2. Lampe à décharge suivant la revendication 1, dans laquelle le point de ramollissement de la brasure (10 ; 61 ; 61' ; 64) pour du verre est, lors d'un réchauffement répété, supérieur de plus de 25°C au point de ramollissement de la brasure pour du verre lors du premier processus de fusion.
  3. Lampe à décharge suivant la revendication 1 ou 2, dans laquelle la brasure (10 ; 61 ; 61' ; 64) pour du verre est en une brasure pour du verre cristallisante (céramique en verre fritté).
  4. Lampe à décharge suivant la revendication 3, dans laquelle la céramique (10 ; 61 ; 61' ; 64) en verre fritté est en Bi-B-Si-O.
  5. Lampe à décharge suivant la revendication 1 ou 2, dans laquelle la brasure (10 ; 61 ; 61' ; 64) pour du verre est en une brasure pour du verre composite.
EP99934474A 1998-06-16 1999-05-11 Lampe a decharge avec electrodes inhibees dielectriquement Expired - Lifetime EP1004137B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19826808 1998-06-16
DE19826808A DE19826808C2 (de) 1998-06-16 1998-06-16 Entladungslampe mit dielektrisch behinderten Elektroden
PCT/DE1999/001421 WO1999066537A2 (fr) 1998-06-16 1999-05-11 Lampe a decharge avec electrodes inhibees dielectriquement

Publications (2)

Publication Number Publication Date
EP1004137A2 EP1004137A2 (fr) 2000-05-31
EP1004137B1 true EP1004137B1 (fr) 2008-04-09

Family

ID=7871051

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99934474A Expired - Lifetime EP1004137B1 (fr) 1998-06-16 1999-05-11 Lampe a decharge avec electrodes inhibees dielectriquement

Country Status (9)

Country Link
US (1) US6469435B1 (fr)
EP (1) EP1004137B1 (fr)
JP (1) JP3568898B2 (fr)
KR (1) KR100354724B1 (fr)
CA (1) CA2300124C (fr)
DE (2) DE19826808C2 (fr)
HU (1) HU224573B1 (fr)
TW (1) TW428208B (fr)
WO (1) WO1999066537A2 (fr)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19845228A1 (de) * 1998-10-01 2000-04-27 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Dimmbare Entladungslampe für dielektrisch behinderte Entladungen
DE10006750A1 (de) * 2000-02-15 2001-08-16 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Herstellungsverfahren für eine flache Gasentladungslampe
DE10057881A1 (de) * 2000-11-21 2002-05-23 Philips Corp Intellectual Pty Gasentladungslampe mit Leuchtstoffschicht
JP3471782B2 (ja) * 2001-02-13 2003-12-02 Ｎｅｃ液晶テクノロジー株式会社 平面型蛍光ランプユニット及びそれを用いた液晶表示装置
CN101925212A (zh) 2002-10-18 2010-12-22 伊菲雷知识产权公司 彩色电致发光显示器
DE202005002837U1 (de) * 2005-02-22 2005-05-04 Deckel Maho Pfronten Gmbh Werkzeugmaschine mit Schutzkabine und Beleuchtungssystem
US7435358B2 (en) * 2005-06-07 2008-10-14 Osram Sylvania Inc. UVC-emitting Sr(Al,Mg)12O19:Pr phosphor and lamp containing same
KR20070010844A (ko) * 2005-07-20 2007-01-24 삼성전자주식회사 면광원 장치 및 이를 구비한 표시 장치
US7449129B2 (en) * 2006-03-07 2008-11-11 Osram Sylvania Inc. Ce,Pr-coactivated strontium magnesium aluminate phosphor and lamp containing same
US7419621B2 (en) * 2006-03-07 2008-09-02 Osram Sylvania Inc. UV-emitting phosphor and lamp containing same
US7396491B2 (en) * 2006-04-06 2008-07-08 Osram Sylvania Inc. UV-emitting phosphor and lamp containing same
CN101507364A (zh) * 2007-03-26 2009-08-12 松下电器产业株式会社 电介质阻挡放电灯点亮装置
WO2011153388A2 (fr) 2010-06-04 2011-12-08 Access Business Group International Llc Lampe à décharge à barrière diélectrique couplée par induction

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1114556A (en) * 1965-11-26 1968-05-22 Corning Glass Works Ceramic article and method of making it
DE1925436B2 (de) * 1968-12-23 1971-01-21 Nippon Electric Glass Company, Ltd , Tokio Bei 425 bis 430 Grad C schmelzendes und kristallisierendes Lotglas zur Verbin dung von Stirnteilen mit Tnchterteilen von Farbfernsehrohrenkolben
CH676168A5 (fr) * 1988-10-10 1990-12-14 Asea Brown Boveri
US5214350A (en) * 1991-09-11 1993-05-25 Zenith Electronics Identification of image displays and their component parts
DE4311197A1 (de) * 1993-04-05 1994-10-06 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Verfahren zum Betreiben einer inkohärent strahlenden Lichtquelle
DE19636965B4 (de) * 1996-09-11 2004-07-01 Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH Elektrische Strahlungsquelle und Bestrahlungssystem mit dieser Strahlungsquelle

Also Published As

Publication number Publication date
KR100354724B1 (ko) 2002-09-30
DE19826808C2 (de) 2003-04-17
HUP0004305A2 (en) 2001-03-28
DE19826808A1 (de) 1999-12-23
JP2002518811A (ja) 2002-06-25
TW428208B (en) 2001-04-01
CA2300124A1 (fr) 1999-12-23
DE59914720D1 (de) 2008-05-21
CA2300124C (fr) 2008-05-06
WO1999066537A2 (fr) 1999-12-23
HUP0004305A3 (en) 2003-07-28
WO1999066537A3 (fr) 2000-01-27
HU224573B1 (hu) 2005-11-28
EP1004137A2 (fr) 2000-05-31
KR20010022965A (ko) 2001-03-26
US6469435B1 (en) 2002-10-22
JP3568898B2 (ja) 2004-09-22

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