EP0173217A1 - Moyen pour conserver la pression à l'intérieur des enceintes à décharge, particulièrement pour des panneaux d'affichage plats à plasma avec post-accélération d'électrons - Google Patents

Moyen pour conserver la pression à l'intérieur des enceintes à décharge, particulièrement pour des panneaux d'affichage plats à plasma avec post-accélération d'électrons Download PDF

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Publication number
EP0173217A1
EP0173217A1 EP85110381A EP85110381A EP0173217A1 EP 0173217 A1 EP0173217 A1 EP 0173217A1 EP 85110381 A EP85110381 A EP 85110381A EP 85110381 A EP85110381 A EP 85110381A EP 0173217 A1 EP0173217 A1 EP 0173217A1
Authority
EP
European Patent Office
Prior art keywords
glass
gas discharge
acceleration
glass container
helium
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.)
Withdrawn
Application number
EP85110381A
Other languages
German (de)
English (en)
Inventor
Manfred Dr. Phys. Kobale
Peter Ing. Mammach
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Publication of EP0173217A1 publication Critical patent/EP0173217A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/38—Cold-cathode tubes
    • H01J17/48—Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H01J17/49—Display panels, e.g. with crossed electrodes, e.g. making use of direct current
    • H01J17/498—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with a gas discharge space and a post acceleration space for electrons
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00—Gas-filled discharge tubes with solid cathode
    • H01J17/02—Details
    • H01J17/22—Means for obtaining or maintaining the desired pressure within the tube

Definitions

  • the invention relates to a device for keeping the pressure constant according to the preamble of claim 1.
  • the invention has for its object to provide a device for a gas discharge vessel in which the gas pressure is kept constant.
  • the pressure in a glass container, in which a He plasma preferably burns, positive ions being accelerated towards the cathode of the gas discharge vessel in the post-acceleration space, is kept constant.
  • the gas reservoir placed in the glass container has a gas permeability which is controllable with the temperature and thus preferably variable for helium, so that a subsequent supply of helium is guaranteed depending on the operating state.
  • Helium is used as the filling gas for the operation of a plasma display with post-acceleration.
  • the optimal filling pressure is 2.5 mbar.
  • the gas volume in a cell with a 12 "diagonal is about 1 dm 3.
  • a glass with low helium diffusion is used for the cell envelope (e.g. a soda-lime glass with approx. 15% alkalis).
  • the helium diffusion through such a glass envelope is so small that needs to be reckoned mbar in ten years only with a pressure drop ⁇ 0, the first Glass containing bloxide is used as the glass solder. which also has a low diffusion rate for helium.
  • the helium consumption increases significantly if the burning voltage is increased or if, as in the plasma screen, electron post-acceleration voltages of a few kilovolts occur and He ions are also accelerated in the direction of the control disk and implanted there.
  • electron post-acceleration voltages of a few kilovolts occur and He ions are also accelerated in the direction of the control disk and implanted there.
  • up to 1 mbar helium / 1000 hours of operating time of the screen are consumed.
  • a gas pressure of less than 2 mbar and more than 3 mbar is not permitted for the screen cell to operate properly. If the pressure is too low, the image contrast is reduced, if the pressure is too high, the dielectric strength decreases.
  • This helium permeability would easily suffice in a tube container (5 cm 3 content 1 mm wall thickness) filled with 1 bar helium to compensate for the implantation loss of helium in the lighted cell.
  • the pressure rise within this time may only be about 0.5 mbar. If quartz glass was used, the pressure would increase by about 5 mbar in one year.
  • the plasma screen cell shown in the figure essentially consists of a screen 5 which is provided with a control disk 6.
  • the plasma screen cell is closed off by a glass cap, in which the cathode 3, which is opposite the control disk 6 and is provided with the power supply 7, is arranged.
  • the glass container 1 is placed under this cathode 3.
  • the glass container 1 (glass ampoule) is preferably provided with a helix serving as a heater 2 made of thick-film conductor paste and is stimulated by the passage of current through the current supply 8.
  • the cathode holder 4 made of insulating material suitably consists of aluminum oxide ceramic.
  • the He implantation in the cathode 3 decreases somewhat with increasing time after long-term test measurements, it is sufficient to make the volume of the glass container 1 just so large that approximately two gas fillings (2 ⁇ 1 dm 3 , 2.5 mbar) can be supplied later .
  • This amount corresponds to a He dispenser volume of 14 x 4 x 100 mm3 with a glass thickness of 1 mm and a bar filling pressure.
  • the He permeation rate is controlled via the He pressure of the plasma screen cell.
  • the He pressure in turn, can be measured using the change in operating voltage.

Landscapes

  • Gas-Filled Discharge Tubes (AREA)
EP85110381A 1984-08-31 1985-08-19 Moyen pour conserver la pression à l'intérieur des enceintes à décharge, particulièrement pour des panneaux d'affichage plats à plasma avec post-accélération d'électrons Withdrawn EP0173217A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3432106 1984-08-31
DE3432106 1984-08-31

Publications (1)

Publication Number Publication Date
EP0173217A1 true EP0173217A1 (fr) 1986-03-05

Family

ID=6244403

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85110381A Withdrawn EP0173217A1 (fr) 1984-08-31 1985-08-19 Moyen pour conserver la pression à l'intérieur des enceintes à décharge, particulièrement pour des panneaux d'affichage plats à plasma avec post-accélération d'électrons

Country Status (3)

Country Link
US (1) US4663564A (fr)
EP (1) EP0173217A1 (fr)
JP (1) JPS6161343A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755710A (en) * 1985-06-05 1988-07-05 U.S. Philips Corporation High-pressure sodium discharge lamp having reduced lamp voltage increase

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4721875A (en) * 1986-02-10 1988-01-26 Autotrol Corporation Radiation-emitting devices
US4835444A (en) * 1986-02-10 1989-05-30 Photo Redux Corp. Radiation-emitting devices
US4879489A (en) * 1986-02-10 1989-11-07 Photo Redux Corp. Radiation-emitting devices
US4853581A (en) * 1986-02-10 1989-08-01 Photo Redux Corp. Radiation-emitting devices
US5883467A (en) * 1997-09-09 1999-03-16 Motorola, Inc. Field emission device having means for in situ feeding of hydrogen
EP1059655A3 (fr) * 1999-05-03 2002-08-21 Technical Visions, Inc. Dispositif pour maintenir la pression d'hélium dans les canaux d'un panneau d'affichage palc
KR100529325B1 (ko) * 2003-06-20 2005-11-17 삼성전자주식회사 플라즈마 디스플레이 패널

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH449785A (de) * 1964-11-20 1968-01-15 Philips Nv Wasserstoffdonator
US3641385A (en) * 1969-06-30 1972-02-08 Nippon Electric Co Gas-filled discharge tube with gas-refilling means
US4317061A (en) * 1979-12-17 1982-02-23 United Technologies Corporation Pressure compensating device for a plasma display panel

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1971939A (en) * 1929-02-20 1934-08-28 Gen Electric Gaseous electric discharge device
DE2412869C3 (de) * 1974-03-18 1980-10-30 Siemens Ag, 1000 Berlin Und 8000 Muenchen Anzeigevorrichtung mit einem Gasentladungsraum als Elektronenquelle, mit einem Elektronennachbeschleunigungsraum und mit einem Leuchtschirm und Verfahren zum Betrieb dieser Anzeigevorrichtung
US4520290A (en) * 1982-10-29 1985-05-28 Cherry Electrical Products Corporation Gas discharge display with built-in heater

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH449785A (de) * 1964-11-20 1968-01-15 Philips Nv Wasserstoffdonator
US3641385A (en) * 1969-06-30 1972-02-08 Nippon Electric Co Gas-filled discharge tube with gas-refilling means
US4317061A (en) * 1979-12-17 1982-02-23 United Technologies Corporation Pressure compensating device for a plasma display panel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4755710A (en) * 1985-06-05 1988-07-05 U.S. Philips Corporation High-pressure sodium discharge lamp having reduced lamp voltage increase

Also Published As

Publication number Publication date
JPS6161343A (ja) 1986-03-29
US4663564A (en) 1987-05-05

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Inventor name: KOBALE, MANFRED, DR. PHYS.

Inventor name: MAMMACH, PETER, ING.