EP1074038B1 - Tube fluorescent plat pour decharges inhibees dielectriquement comportant des elements d'ecartement - Google Patents

Tube fluorescent plat pour decharges inhibees dielectriquement comportant des elements d'ecartement Download PDF

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Publication number
EP1074038B1
EP1074038B1 EP99945734A EP99945734A EP1074038B1 EP 1074038 B1 EP1074038 B1 EP 1074038B1 EP 99945734 A EP99945734 A EP 99945734A EP 99945734 A EP99945734 A EP 99945734A EP 1074038 B1 EP1074038 B1 EP 1074038B1
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EP
European Patent Office
Prior art keywords
spacer
reflector lamp
lamp according
flat reflector
flat
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
EP99945734A
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German (de)
English (en)
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EP1074038B8 (fr
EP1074038A2 (fr
Inventor
Frank Vollkommer
Lothar Hitzschke
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.)
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Publication date
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Publication of EP1074038A2 publication Critical patent/EP1074038A2/fr
Publication of EP1074038B1 publication Critical patent/EP1074038B1/fr
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Publication of EP1074038B8 publication Critical patent/EP1074038B8/fr
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Classifications

    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/313—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being gas discharge devices
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F13/00—Illuminated signs; Luminous advertising
    • G09F13/04—Signs, boards or panels, illuminated from behind the insignia
    • G09F13/0418—Constructional details
    • G09F13/0472—Traffic signs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/305—Flat vessels or containers
    • 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

Definitions

  • the present invention relates to a flat radiator lamp for dielectrically impeded discharges, which can be used in particular for the backlighting of display devices, especially liquid crystal displays.
  • the discharge vessel filled with a gas filling consists essentially of a base plate and a ceiling plate, which are connected by a frame.
  • the distance between the two plates is significantly smaller than their width and length.
  • the frame need not necessarily be formed as a separate component, but is defined in this invention in that it completes the filled by the gas filling discharge volume in the plane of the plates and between them to the outside.
  • the frame also be formed by a curved outer edge of one of the two plates, so that the frame forms the edge of a tub, so to speak, whose flat central part is the bottom plate or ceiling plate.
  • the prior art are also called the EP 0 521 553 A2 , which shows a flat gas discharge lamp with vacuum filling, which is protected from implosion by the stability of sufficiently thick walls of the floor and ceiling plate.
  • Spacers in the mold each define almost the entire width of the flat radiator continuous ribs between the plates, which define an overall meandering discharge channel for a conventional Hg discharge through alternating recesses to a frame of the discharge vessel, are shown in " Flat Lamp Technology for LCD's "by R. Hicks and W. Halstead, SPIE, Vol. 2219, Cockpit Displays (1994 ).
  • the exact cross-section and length dimensions of the discharge channel defined by these spacers are essential for the so-called wall-stabilized Hg discharge.
  • an electrode assembly in which the anodes and cathodes are strip-like and parallel to each other alternately, ie offset from each other on the bottom plate.
  • This invention is based on the technical problem of improving a flat radiator lamp of the type described above with regard to stability and light emission properties.
  • the solution according to the invention of this problem as a generic concept is therefore based on a flashlamp for dielectrically impeded discharges with a filled with a gas filling discharge vessel, a substantially flat bottom plate, a substantially flat and at least partially transparent ceiling plate, a Plate connecting frame and at least one the two plates against each other supporting spacers, and having at least partially strip-like and in a projection on a plane substantially parallel offset anodes and cathodes, wherein between the anodes and the gas filling, a dielectric layer is arranged, and with Electrode structures for local determination of partial discharges.
  • Parallel offset means that there is an adjacent, substantially parallel cathode strip piece substantially to each anode strip piece and vice versa.
  • the invention solves this technical problem by in that the electrode structures define the partial discharges in alternating rows on both sides of a cathode strip, the spacer being completely separated from the frame by a gap and at least with its contact surfaces with the plates in the projection between the electrode strips and between the locations of predetermined partial discharges and between them Locating two is arranged on the same side adjacent partial discharges.
  • the invention is based on the conventional concept of spacers, which are connected as ribs on at least one side to the frame of the discharge vessel. Rather, according to the invention it has been recognized that a sufficient stabilizing effect of the spacers is possible even if the spacers are connected only to the plates, but not directly to the frame. Namely, the substantial loads occur perpendicular to the planes of the plates, so that a stretched shape of the spacers and anchoring of the spacers on the frame is not necessary.
  • Another advantage of the invention here is the good gas flow dynamics within the discharge vessel during pumping during the manufacturing process.
  • a lamp according to the invention instead of the conventional and not shown vacuum furnace process also Pumpstengelaten be used in which the discharge vessel via the exhaust tube with a vacuum pump at the same time (in large lamps possibly locally progressive) pumped out and then on the exhaust tube is filled.
  • the main disadvantage of the vacuum furnace solution consists in particular in the considerable expense of large-format lamps, which are certainly of technical interest, especially in connection with larger display device and can be made relatively easily with the technology used here of flat-beam lamps with dielectrically impeded discharge.
  • the spacers according to the invention have the advantage that can be found by the task of continuous rib geometry with connection to the frame "local solutions" for spacers, which can be tuned with the geometric design of the electrode structure.
  • the electrode geometry can be designed depending on the geometric extent of the desired spacers with little or virtually no consideration for the local positions of the spacer or. Contrary to expectations, it has also been found that an arrangement of spacers in strong field-afflicted positions between the electrodes is not a problem. In particular, the entire level of the discharge vessel (in the projection) evenly with partial discharges filling and highly symmetrical Electrode geometries find use. The spacers can also be largely freely positioned according to mechanical criteria, without having to greatly adapt the electrode structure.
  • the term "frame” is defined functionally in the context of this invention, so does the term "spacer".
  • the discharge vessel of a flat radiator lamp according to the invention can also be constructed from essentially two main components, namely a base plate, in which the frame and spacers are already integrally formed, and a ceiling plate. This can be achieved by deep drawing or pressing, sand blasting and other methods.
  • the present invention now adds electrode structures that determine the local distribution of the partial discharges beyond the determination by the geometry of the electrode strips.
  • Such structures are disclosed inter alia in the already cited DE 196 36 965.7 to which reference is made in this regard.
  • Candidates include protrusions on the cathodes, layer thickness variations of the dielectric, width variations of the electrodes, etc.
  • the stabilizing effect of the spacers can be optimized by dividing the lateral dimensions of the discharge vessel into substantially equal sections. This means concretely that when using a spacer this is arranged approximately in the middle of the surface of the flat radiator, two spacers which share the corresponding larger the length of the flat radiator in thirds, etc. and analogous to two-dimensional spacer assemblies.
  • the intermediate spaces formed between the spacers should have a certain size according to the invention, in particular the spaces between the frame. It is preferred that the spaces are more than the simple, better more than twice the distance of the top and the bottom plate from each other.
  • spacers can be limited in all directions with more or less "point-shaped" contact surfaces on the ceiling plate by limiting this contact surface.
  • this is not essential according to the invention, but it can also "linear" contact surfaces z. B. by cylindrical or prismatic spacers which are then formed sufficiently narrow in at least one direction.
  • a quantitative characterization of this restriction of the contact surface usefully refers to the bridged by the spacer distance of the discharge vessel, ie z. B. on the plate spacing of a flat radiator fluorescent lamp.
  • the described small extent of the contact surface should be less than 30%, preferably less than 20% or 10% of this distance.
  • Another essential embodiment of the invention relates to the stability of the discharge vessel with the spacers in the case of thermal cycles, as they occur practically inevitable in lamp operation.
  • the thermal expansion coefficient of the spacers should be in the range of ⁇ 30% of the coefficient of expansion of the main components of the discharge vessel.
  • the main constituents of the discharge vessel are those components whose thermal expansion, due to their geometric dimensions and their function in the discharge vessel, is essential for the thermal expansion of the overall discharge vessel.
  • a flat radiator z. B the two plates as well as the two connecting frames. Mismatches in this area, depending on the extent of the thermal stresses during operation, to internal stresses and displacements of the vessel components and the spacers with each other and thus to instabilities and to dissolve connections up to the breakage of the lamp.
  • spacers soft glasses As favorable materials for the spacers soft glasses have been found. Such soft glasses can also be used in material processing further processed form, for. B. as held together by a binding material flour or glass solder. Finally, various ceramic materials come into question, in particular Al 2 O 3 ceramic. For the question of the choice of material and the expansion coefficients reference is made to the already cited parallel application "fluorescent lamp with spacers and locally thinned phosphor layer thickness".
  • a further possibility for reducing the optical disturbances by an image of the spacer consists in a sheathing thereof through a phosphor layer.
  • the spacer on the other side of the transparent wall appears no more or less pronounced as shading, except for the immediate area of the system between the spacer and the wall.
  • the effective contact surface to be evaluated in the sense of the above statements for minimizing the contact surface is that of the spacer without the phosphor layer (or only with regions of the phosphor layer which are not sufficiently excited).
  • a further possibility for brightening the surroundings of the spacer consists according to the invention in a reflective coating of a region of the spacer facing the transparent wall.
  • the coupling of the light diffusely distributed within the discharge vessel into the area of the phosphor layer diluted according to the invention is reinforced on the wall.
  • the invention provides a significant improvement to the effect that the corresponding stabilization of the discharge vessel can be achieved without significant restrictions on the arrangement of the electrodes and the uniformity of the light emission.
  • Another aspect is the implosion of flat lamp lamps with vacuum gas filling. Since, according to the invention, a stable discharge vessel can now also be produced with respect to the risk of implosion without being excessively restricted elsewhere in the design of the lamp (see above), underpressure gas fillings are to be regarded as a preferred case of the invention. They avoid the need for buffer gas additives for producing an internal pressure adapted to the external atmospheric pressure in the discharge vessel. This avoids possible technical disadvantages of the buffer gas additives and creates an adequate technical alternative.
  • a final essential aspect of the invention is the surprising high voltage capability of the electrode structures despite the proximity of the spacers.
  • High voltage capability with respect to the amplitudes of, for example, a pulsed electrical supply may be of interest in terms of increasing the yield of the lamp. This applies in particular to the application for the backlighting of liquid crystal displays, which absorb a large part of the light outputs of the lamp.
  • the invention is preferably directed to flat lamp lamps with a design for supply voltage amplitudes of at least 600 V, particularly preferably 800 V or 1000 V or 1200 V respectively.
  • FIG. 1 illustrates a typical example of a spacer according to the invention in a sectional and cross-sectional view.
  • a precision glass ball 3 made of soft glass with a diameter of 5 mm lies between a base plate 1 and a ceiling plate 2 of a flat radiator lamp.
  • dielectric materials e.g. As ceramics or other glasses in question, and materials that go back to glass flour or ceramic flour and also contain a binder or the like, for. B. glass solder.
  • a binder or the like for. B. glass solder.
  • an important aspect in addition to the dielectric properties are the coefficients of thermal expansion already discussed elsewhere.
  • the glass ball 3 is coated with a phosphor layer 4, which is also on the bottom plate 1 and on the ceiling plate 2.
  • the glass ball 3 is soldered via a glass solder in the area 5 on the bottom plate 1 in order to fix it during assembly. On the ceiling plate 2, it is only on. Around this contact surface 6 around the phosphor layer 4 of the ceiling plate 2 is wiped in a certain range 7.
  • a thin frosted glass layer 8 is formed on which a prism sheet 9 rests (Brightess enhancement film of the manufacturer 3M).
  • FIG. 2 now illustrates three different illustrated with the letters A, B and C variants of the arrangement of such a spacer 3 in a typical electrode configuration of a flat radiator lamp, to which reference is made to the application "gas discharge lamp with dielectrically impeded electrodes”.
  • the illustrated electrodes correspond in the FIG. 2 a projection on a disk plane.
  • the FIG. 2 So first, it does not determine whether the anodes 11 and the cathodes 12 are deposited on or in the same plate or on or in different plates.
  • the former case is preferable from the perspective of simplifying the manufacturing process and, for example, in Figure 6a of the already cited DE 195 26 211.5 shown.
  • the second case has certain advantages, to which reference is made to FIG. 9b of the already cited application "Gas discharge lamp with dielectrically impeded electrodes". Will the FIG. 2 the present application is not considered as a top view but as a projection representation, it applies to both cases.
  • FIG. 2 in the right and in the left half of the illustration two so far different electrode configurations shown as the distance of the nose-like projections 13 to the cathode 12 (see. DE 196 36 965.7 ) is quadrupled.
  • the delta-shaped partial discharges are designated by 14.
  • A denotes a possibility in which the glass sphere 3 lies in the projection on a plate plane between the individual anodes of a twin anode arrangement 11.
  • this area is by no means really field-free. Rather, the discharges between the respective individual anodes associated cathode 12 and these individual anodes are never really symmetrical.
  • this position A is also a possible position and the glass ball 3 is in the direction indicated by the arrows vertical direction of FIG. 2 essentially positionable as desired.
  • the second option shown B as in the context of this invention preferred variant in which the glass ball 3 is in a sense in the back of a nose-like projection 13 between a cathode 12 and a single anode of the twin anode 11.
  • FIG. 3 shows for illustrative purposes a largely the right half of FIG FIG. 2 corresponding case in which the variant B is used for the arrangement of the spacer 3.
  • no partial discharges 14 are drawn, but a complete arrangement of a larger number of 49 glass balls 3, which form a pattern over substantially the entire area of a discharge vessel, not shown, in a substantially uniform distribution.
  • the distances of the outer glass ball 3 to the edges of the discharge vessel substantially correspond to the distances between the balls, so that a total of approximately a subdivision of the width and the length of the rectangular discharge vessel results in uniform subunits.
  • FIG. 4 A comparatively different embodiment is in FIG. 4 outlined.
  • the distances between the spacers 3 are further set in a locally comparable electrode structure.
  • an electrode structure for a flat radiator signal lamp which is part of a traffic light.
  • the weight of the flat lamp is of less importance than in the previous one.
  • the electrode structure is characterized by a round enveloping overall shape.
  • the frame 15 of the discharge vessel runs in a circle between the bus-like electrode mergers right and left in FIG. 4 and the immediate discharge region recognizable by the nose-like projections 13.
  • the area within this frame is subdivided by the illustrated arrangement of the spacers 3 again in substantially equal distances.

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

Claims (13)

  1. Lampe de radiateur de surface pour des décharges (14) rendues incomplètes par voie diélectrique comprenant une enceinte de décharge qui est remplie d'une atmosphère gazeuse et qui a une plaque (11) de fond sensiblement plane, une plaque (2) de plafond sensiblement plane et au moins en partie transparente, un cadre (15) reliant les plaques et au moins une entretoise (3) soutenant mutuellement les deux plaques (1, 2) et comprenant des anodes (11) et des cathodes (12) au moins en partie en forme de bande et disposées, dans une projection sur un plan de plaque, en étant sensiblement décalées parallèlement les unes par rapport aux autres, une couche diélectrique étant disposée entre les anodes et l'atmosphère gazeuse, et comprenant des structures (13) d'électrodes pour immobiliser spatialement des sous-décharges (14), caractérisée en ce que les structures (11, 12) d'électrodes immobilisent les sous-décharges (14) en des rangées alternées des deux côtés d'une bande de cathodes, l'entretoise (3) est séparée complètement du cadre (15) par un espace intermédiaire et est disposée au moins par ses surfaces de contact avec les plaques (1, 2), dans la projection, entre les bandes (11, 12) d'électrodes et entre les emplacements des sous-décharges immobilisées et ainsi entre les emplacements de deux sous-décharges voisines du même côté.
  2. Lampe de radiateur de surface suivant la revendication 1, dans laquelle l'entretoise (3) est, vue dans la direction de la bande, à peu près au niveau d'une sous-décharge du côté opposé de cette bande.
  3. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle la ou les entretoises (3) partagent les dimensions latérales de l'enceinte de décharge sensiblement en parties égales.
  4. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle l'espace intermédiaire est plus grand que la distance entre les plaques (1, 2).
  5. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle la surface de contact entre l'entretoise (3) et la plaque (2) de plafond est, au moins dans une direction de la surface, plus petite que 30 % de la distance entre les plaques (1, 2).
  6. Lampe de radiateur de surface suivant la revendication 5, dans laquelle la surface de contact entre l'entretoise (3) et la plaque (1, 2) de plafond est, dans toutes les directions de la surface, plus petite que 30 % de la distance entre les plaques.
  7. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle l'entretoise (3) a un coefficient de dilatation thermique qui correspond, avec une tolérance de plus ou moins 30 %, à celui des constituants (1, 2, 15) principaux de l'enceinte de décharge.
  8. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle l'entretoise (3) est essentiellement en verre tendre, en un matériau contenant essentiellement du verre tendre ou en un matériau céramique.
  9. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle l'entretoise (3) est appliquée sans matière de liaison sur la plaque (2) de plafond.
  10. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle l'entretoise (3) a un revêtement (4) extérieur de substance luminescente.
  11. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle l'entretoise a, dans une partie tournée vers la plaque de plafond, un revêtement réfléchissant.
  12. Lampe de radiateur de surface suivant l'une des revendications précédentes, dans laquelle l'atmosphère gazeuse est en dépression.
  13. Lampe de radiateur de surface suivant l'une des revendications précédentes conçue pour des amplitudes de tension d'alimentation d'au moins 600 V.
EP99945734A 1998-04-20 1999-04-09 Tube fluorescent plat pour decharges inhibees dielectriquement comportant des elements d'ecartement Expired - Lifetime EP1074038B8 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19817480A DE19817480B4 (de) 1998-03-20 1998-04-20 Flachstrahlerlampe für dielektrisch behinderte Entladungen mit Abstandshaltern
DE19817480 1998-04-20
PCT/DE1999/001092 WO1999054916A2 (fr) 1998-04-20 1999-04-09 Tube fluorescent plat pour decharges inhibees dielectriquement comportant des elements d'ecartement

Publications (3)

Publication Number Publication Date
EP1074038A2 EP1074038A2 (fr) 2001-02-07
EP1074038B1 true EP1074038B1 (fr) 2009-04-01
EP1074038B8 EP1074038B8 (fr) 2009-06-17

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Application Number Title Priority Date Filing Date
EP99945734A Expired - Lifetime EP1074038B8 (fr) 1998-04-20 1999-04-09 Tube fluorescent plat pour decharges inhibees dielectriquement comportant des elements d'ecartement

Country Status (9)

Country Link
US (1) US6531822B1 (fr)
EP (1) EP1074038B8 (fr)
JP (1) JP2002512425A (fr)
KR (1) KR100417432B1 (fr)
CA (1) CA2329085C (fr)
DE (2) DE19817480B4 (fr)
HU (1) HUP0103677A3 (fr)
TW (1) TW439091B (fr)
WO (1) WO1999054916A2 (fr)

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TW412771B (en) * 1997-03-21 2000-11-21 Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh Gas discharge lamp with dielectrically impeded electrodes

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Publication number Publication date
US6531822B1 (en) 2003-03-11
KR100417432B1 (ko) 2004-02-05
HUP0103677A2 (hu) 2002-02-28
KR20010042877A (ko) 2001-05-25
DE19817480B4 (de) 2004-03-25
CA2329085A1 (fr) 1999-10-28
DE19817480A1 (de) 1999-09-23
CA2329085C (fr) 2008-01-08
EP1074038B8 (fr) 2009-06-17
WO1999054916A2 (fr) 1999-10-28
DE59914995D1 (de) 2009-05-14
WO1999054916A3 (fr) 1999-12-02
TW439091B (en) 2001-06-07
EP1074038A2 (fr) 2001-02-07
JP2002512425A (ja) 2002-04-23
HUP0103677A3 (en) 2002-04-29

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