US3580654A - Method of making display devices - Google Patents

Method of making display devices Download PDF

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Publication number
US3580654A
US3580654A US764983A US3580654DA US3580654A US 3580654 A US3580654 A US 3580654A US 764983 A US764983 A US 764983A US 3580654D A US3580654D A US 3580654DA US 3580654 A US3580654 A US 3580654A
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US
United States
Prior art keywords
tubulation
vaporizable material
capsule
envelope
cells
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
US764983A
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English (en)
Inventor
George A Kupsky
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.)
Unisys Corp
Original Assignee
Burroughs Corp
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 Burroughs Corp filed Critical Burroughs Corp
Application granted granted Critical
Publication of US3580654A publication Critical patent/US3580654A/en
Assigned to BURROUGHS CORPORATION reassignment BURROUGHS CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). DELAWARE EFFECTIVE MAY 30, 1982. Assignors: BURROUGHS CORPORATION A CORP OF MI (MERGED INTO), BURROUGHS DELAWARE INCORPORATED A DE CORP. (CHANGED TO)
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
    • 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
    • H01J9/38—Exhausting, degassing, filling, or cleaning vessels
    • H01J9/395—Filling vessels
    • 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
    • H01J9/26—Sealing together parts of vessels
    • H01J9/261—Sealing together parts of vessels the vessel being for a flat panel display

Definitions

  • the material is freed from the capsule, and, with the entire assembly heated to a suitable temperature to cause the anitsputtering agent to enter the working area of the device, the tubulation is sealed off at an area close to the device itself and with the capsule within the portion of the tubulation which is removed.
  • the mercury is provided in a capsule which carries a heating wire and is permanently mounted within the tube with the heating wire connected to two tube pins.
  • the mcrcury is released from the capsule at a desired stage in the manufacturing process by means of heat generated by current flow through the heating wire.
  • the mercury is released, its vapor readily fills the tube envelope.
  • tube pins are provided for an anode, for each of ten cathodes, and for two decimal points, and, in addition, two extra tube pins are required for connection to the capsule heating wire.
  • space must be available inside the envelope for the mercury capsule.
  • a display device of the flat panel type which includes a large number of tiny cells formed in a unitary panel and utilizing cold cathodes and gaseous glow.
  • These devices use a gas of the type described above, and, in addition, require mercury to minimize cathode sputtering.
  • known procedures for introducing the gases and for introducing the mercury are not satisfactory. For example, pins are not available for providing heating current for a capsule, and space is not available in the device for a mercury capsule.
  • the invention comprises a method making a gas discharge display device including the steps of assembling the parts of the device, baking out the device, introducing an ionizable gas into the device aging the electrodes of the device, introducing an antisputtering agent which has relatively high molecular weight and vaporization temperature, treating the device to cause the anitsputtering agent to vaporize and enter all portions of the device, and then sealing the device.
  • FIG. I is a perspective view of a display device prepared according to the invention.
  • FIG. 2 is a sideview of the device of FIG. I and apparatus used in the manufacture thereof.
  • a display device embodying the invention shown in FIG. I, includes a central plate of insulating material such as glass or ceramic which is provided with rows and columns of apertures or cells 30.
  • Top and bottom glass cover plates 40 and 50 are secured to the center plate 20 with parallel row electrodes 60 between bottom'plate 50 and plate 20, and parallel column electrodes 70 between top plate 40 and center plate 20.
  • Each row electrode 60 is aligned with a row of cells 30, and each column electrode 70 is aligned with a column of cells 30, and a cell is located at each crossing of a row electrode and a column electrode.
  • the row electrodes 60 are cathodes, and the column electrodes are anodes.
  • Plates 20, 40, and 50 are preferably rectangular, and the-row and column conductors 60 and 70 extend beyond the edges of the plates so that electrical connection can be made to them.
  • the central plate 20 is about 1 mm. in thickness
  • the top and bottom plates are about I to 3 mm. in thickness
  • the cells are about 0.04 inch in diameter at a density of about twelve cells per linear inch.
  • the conductors 60 and 70 are about 0.05 inch wide and about 5 mils thick.
  • the various glass plates are provided with plate 40 carrying a glass tubulation in which is positioned a small glass capsule which contains a tiny droplet of mercury 92.
  • the capsule 90 is supported by a wire conductor 100 which is wrapped around it and has its ends extending through the wall of the capsule for subsequent connection outside the capsule to a source of power 106.
  • the various plates are sealed together along their edges by means of a glass frit or the like to provide a gastight seal.
  • the panel is pumped out and baked out by way of the tubulation 80, and it is filled with a gas suitable for sustaining cathode glow.
  • Gases such as argon and neon are suitable, with one satisfactory gas mixture comprising about 5 percent argon, percent neon, and a trace of krypton.
  • the gas pressure is in the range of about 40 to about 80 Torr at room temperature.
  • the tubulation 80 is sealed off below the mercury capsule as at 120.
  • the panel is then aged by cyclically firing each of the rows of cells in order, with about 50 to about ma. of current flowing per row of cells. This aging step is carried out for a few hours.
  • the mercury is released from its capsule 90 by means of heat applied to the capsule to cause it to crack and release the mercury.
  • the necessary heat is generated by current flow in conductor 100.
  • the mercury initially deposits on the wall of the tubulation above the capsule 90, and, according to the invention, in order to force the mercury into all of the cells 30 of the panel, the panel is baked in an oven at about 200 C. for several hours. With the panel held at this temperature, the portion of the tubulation containing the mercury capsule is removed, and the tubulation is sealed off at 130. The first aging step is then repeated.
  • the device 10 may be heated to about 200 C. before the mercury is released from its capsule, and then when the mercury is released, it travels into the cells 30 directly without first condensing in the tubulation.
  • the capsule 90 could be made of metal, and it could be heated by induction. It could also be of a material which can absorb infrared radiation, such radiation then being used for heating and breaking the capsule. Other modifications may also be made within the scope of the invention.
  • a method of manufacturing a display tube of the type including a plurality of relatively small gas-filled cells comprising the steps of mounting and enclosing electrodes within an envelope having an exhaust tubulation, the electrodes having portions associated with each of said cells,
  • step of placing a supply of vaporizable material in the tubulation involves placing a sealed capsule containing the vaporizable material together with an attached wire in said tubulation, and wherein the step of activating said vaporizable material involves passing a current through said attached wire to heat the enclosed vaporizable material and crack said capsule.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Manufacture Of Electron Tubes, Discharge Lamp Vessels, Lead-In Wires, And The Like (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
US764983A 1968-10-02 1968-10-02 Method of making display devices Expired - Lifetime US3580654A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US76498368A 1968-10-02 1968-10-02

Publications (1)

Publication Number Publication Date
US3580654A true US3580654A (en) 1971-05-25

Family

ID=25072333

Family Applications (1)

Application Number Title Priority Date Filing Date
US764983A Expired - Lifetime US3580654A (en) 1968-10-02 1968-10-02 Method of making display devices

Country Status (9)

Country Link
US (1) US3580654A (fr)
BE (1) BE739670A (fr)
BR (1) BR6912969D0 (fr)
CH (1) CH506178A (fr)
DE (1) DE1949112A1 (fr)
FR (1) FR2019657A1 (fr)
GB (1) GB1240068A (fr)
NL (1) NL6914476A (fr)
NO (1) NO127724B (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913999A (en) * 1972-08-11 1975-10-21 Thorn Electrical Ind Ltd Manufacturing electric devices having sealed envelopes
EP0004750A2 (fr) * 1978-03-31 1979-10-17 Thorn Emi Plc Méthode et dispositif pour l'introduction de matérial de dosage dans l'empoule d'une lampe à arc
US4317062A (en) * 1979-08-06 1982-02-23 Beckman Instruments, Inc. Valve means and mercury reservoir for gas discharge display
US5952775A (en) * 1994-06-09 1999-09-14 Canon Kabushiki Kaisha Image-forming apparatus having vent tubes
US20030141815A1 (en) * 2002-01-25 2003-07-31 Jae-Sang Chung Method for removing impurities of plasma display panel
US20080174227A1 (en) * 2002-10-17 2008-07-24 Canon Kabushiki Kaisha Gas Measuring Method Inside a Sealed Container

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1565579A (en) * 1921-07-28 1925-12-15 Westinghouse Lamp Co Method of introducing getter materials into incandescent lamps
US1826383A (en) * 1926-05-01 1931-10-06 Claude Neon Lights Inc Method and apparatus for introducing foreign substances into vacuum tube lights
US1841034A (en) * 1928-12-21 1932-01-12 Western Electric Co Electrooptical apparatus
US2449493A (en) * 1947-08-28 1948-09-14 Westinghouse Electric Corp Attaining high vacuum in photoelectric tubes
US2755159A (en) * 1953-05-19 1956-07-17 Sylvania Electric Prod Vapor filling process for discharge lamps
US2991387A (en) * 1958-09-22 1961-07-04 Burroughs Corp Indicator tube

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1565579A (en) * 1921-07-28 1925-12-15 Westinghouse Lamp Co Method of introducing getter materials into incandescent lamps
US1826383A (en) * 1926-05-01 1931-10-06 Claude Neon Lights Inc Method and apparatus for introducing foreign substances into vacuum tube lights
US1841034A (en) * 1928-12-21 1932-01-12 Western Electric Co Electrooptical apparatus
US2449493A (en) * 1947-08-28 1948-09-14 Westinghouse Electric Corp Attaining high vacuum in photoelectric tubes
US2755159A (en) * 1953-05-19 1956-07-17 Sylvania Electric Prod Vapor filling process for discharge lamps
US2991387A (en) * 1958-09-22 1961-07-04 Burroughs Corp Indicator tube

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3913999A (en) * 1972-08-11 1975-10-21 Thorn Electrical Ind Ltd Manufacturing electric devices having sealed envelopes
EP0004750A2 (fr) * 1978-03-31 1979-10-17 Thorn Emi Plc Méthode et dispositif pour l'introduction de matérial de dosage dans l'empoule d'une lampe à arc
EP0004750A3 (en) * 1978-03-31 1979-10-31 Thorn Emi Limited Heating of dosing capsule
US4317062A (en) * 1979-08-06 1982-02-23 Beckman Instruments, Inc. Valve means and mercury reservoir for gas discharge display
US5952775A (en) * 1994-06-09 1999-09-14 Canon Kabushiki Kaisha Image-forming apparatus having vent tubes
US6867537B2 (en) 1994-06-09 2005-03-15 Canon Kabushiki Kaisha Image-forming apparatus having vent tube and getter
US20030141815A1 (en) * 2002-01-25 2003-07-31 Jae-Sang Chung Method for removing impurities of plasma display panel
US20080174227A1 (en) * 2002-10-17 2008-07-24 Canon Kabushiki Kaisha Gas Measuring Method Inside a Sealed Container
US7679279B2 (en) * 2002-10-17 2010-03-16 Canon Kabushiki Kaisha Image display device having a sealed container with an exhaust pipe

Also Published As

Publication number Publication date
BE739670A (fr) 1970-03-16
CH506178A (de) 1971-04-15
BR6912969D0 (pt) 1973-01-02
FR2019657A1 (fr) 1970-07-03
NL6914476A (fr) 1970-04-06
NO127724B (fr) 1973-08-06
GB1240068A (en) 1971-07-21
DE1949112A1 (de) 1970-04-16

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Legal Events

Date Code Title Description
AS Assignment

Owner name: BURROUGHS CORPORATION

Free format text: MERGER;ASSIGNORS:BURROUGHS CORPORATION A CORP OF MI (MERGED INTO);BURROUGHS DELAWARE INCORPORATEDA DE CORP. (CHANGED TO);REEL/FRAME:004312/0324

Effective date: 19840530