US3798482A - Gas-discharge display panels - Google Patents

Gas-discharge display panels Download PDF

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Publication number
US3798482A
US3798482A US00239963A US3798482DA US3798482A US 3798482 A US3798482 A US 3798482A US 00239963 A US00239963 A US 00239963A US 3798482D A US3798482D A US 3798482DA US 3798482 A US3798482 A US 3798482A
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United States
Prior art keywords
matrix
films
gas
display panel
powder material
Prior art date
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Expired - Lifetime
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US00239963A
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English (en)
Inventor
J Reboul
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.)
Thales SA
Original Assignee
Thomson CSF SA
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Filing date
Publication date
Application filed by Thomson CSF SA filed Critical Thomson CSF SA
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Publication of US3798482A publication Critical patent/US3798482A/en
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    • 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
    • H01J17/492—Display panels, e.g. with crossed electrodes, e.g. making use of direct current with crossed electrodes

Definitions

  • ABSTRACT In gas-discharge display panels consisting of a matrix (1) clamped between two films of insulating material (3) separating it from two networks of electrodes (5), the invention provides for the interposition between said matrix and said insulating material films, of a refractory metal oxide or silicon powder material (10) mixed with a binder, in order to avoid the matrix and the twofilms of insulating material to stick to one another during the high-temperature operations to which the panel is submitted during its manufacture said powder material is preferably a refractory metal oxide.
  • the present invention relates to an improvement in gas-discharge display panels.
  • These panels comprise a matrix in'the form of a perforated plate, with, disposed at either side of it and in its immediate neighbourhood, two networks of linear electrically conductive electrodes crossing each other in pairs over said holes.
  • These networks are generally formed on two thick slabs applied against the matrix with those of their faces carrying the network facing said matrix, said networks being coated with two films of insulating material. Arrangements are made to maintain a gas fillingbetween the, two slabs inside a circumference surrounding the matrix. 1 It should be added, too, that under 'the'effect of the volt'age'applied between two of the electrodes belonging one to the first network and the other to the second, the gas contained in the hole located at the point of their intersection is ionised andthus this point displayed.
  • the invention provides for the addition of an element to those normally encountered in the prior art structures.
  • This element consists of a film of insulating material arranged between the matrix and the insulating films or plates which cover the network of conductive electrodes. This of powder material between one another, prevents the sticking observed in the prior art designs and makes it possible for the component parts of the panel to execute displacements in relation to one another during the heating operations to which it is submitted.
  • a gasdischarge display panel comprising a matrix in the form of a perforated plate and, at'either side thereof, two networks of linear electrically conductive electrodes, an electrode of one of the networks and an electrode at the other intersecting one another opposite one of said holes, the conductors of each of said networks being separated from the matrix by a film of insulating material in contact with the matrix, characterized in that said matrix is covered on each of its faces in contact with said films, with a supplementary insulating film constituted by a mixture of powder material and a binder.
  • the powder material is a refractory material, that is to say one having a high melting point, in all cases much higher than that of the pieces of which the panel is made.
  • FIG, 1 illustrates the bottom half of a gas-discharge display panel.
  • the top half not shown, is identical to the bottom half with the exception that it contains the pumping and filling pipe.
  • the matrix 1 with the holes 2 the network of linear electrodes 5 deposited on the slab 4 and covered by the insulating plate 3, and, surrounding the matrix, the bond zone 6 between the slab 4 and the second slab identical toit but not shown in the figure, this zone delimiting around the matrix the compartment which is filled with gas, can be seen.
  • FIG. 2 the same elementsas those shown in the preceding figure can be seen, plus the insulating film 10 in accordance with the invention which is constituted by a powder material mixed with a binder.
  • the powder material in question can be chosen from a wide variety of materials ranging from silica powder to metal oxides of refractory metals, that is to say ones having a high melting point.
  • the binder which is present in a small proportion in the mixture can be one of the conventional bonds used in electron tubes work, for example a metal-alkaline silicate such as potassium silicate.
  • the matrix is prepared in accordance with the prior art, for example in the form of a glass plate five-tenths mm in thickness, pierced by a right-angled network of holes five-tenths mm in diameter.
  • a liquid suspension containing 50 percent by weight of chrome oxide whose grain size ranges between and 20 microns, a few percent of potassium silicate and the remainder water, in order to produce a film having a thickness of between 20 and 50 microns.
  • the matrix After drying in contact with the atmosphere, the matrix is mounted in the panel in the manner described in the prior art.
  • the potassium silicate effects a bond between the particles of chrome oxide whose proportion by weight in the film 10, at the end of the preparation of the matrix, is in the order of 90 percent.
  • this intermediate film means that during the high-temperature operations referred to hereinbefore, the adhesion observed in the prior art panels, between matrix and insulating plates, is avoided, the more so in fact the greater the interval between the melting point of the powder material and the maximum temperature applied to the tube during the course of its manufacture.
  • the action of the binder is sufficiently weak to allow the grains which make up the film in accordance with the invention a certain degree of latitude to displace in relation to one in the form of a perforate plate having a plurality of holes therein and, at either side thereof, two networks of linear electrically conductive electrodes, an electrode of one of the networks and an electrode at the other network intersecting one another opposite one of said holes, the conductors of each of said networks being separated from the matrix by afilm of insulating material in contact with the matrix, wherein said matrix is covered substantially only on each of its faces in contact with said films with a supplementary insulating film comprising a mixture of a powdered material selected from the group consisting of silica and at least one refractory metal oxide; said powdered material having a high melting point, and a binder therefor such that, when the display panel is subjected to heat, the powdered material of the insulating film provides for relative movement between the matrix and the insulating material, upon heating and subsequent cooling.
  • a display panel as claimed in claim 1 wherein the proportions by weight of said powder material and said binder in said supplementary insulating film, are respectively and 5 percent.

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  • Gas-Filled Discharge Tubes (AREA)
  • Glass Compositions (AREA)
US00239963A 1971-04-23 1972-03-31 Gas-discharge display panels Expired - Lifetime US3798482A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7114579A FR2134895A5 (https=) 1971-04-23 1971-04-23

Publications (1)

Publication Number Publication Date
US3798482A true US3798482A (en) 1974-03-19

Family

ID=9075846

Family Applications (1)

Application Number Title Priority Date Filing Date
US00239963A Expired - Lifetime US3798482A (en) 1971-04-23 1972-03-31 Gas-discharge display panels

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Country Link
US (1) US3798482A (https=)
DE (1) DE2219738A1 (https=)
FR (1) FR2134895A5 (https=)
GB (1) GB1353271A (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448727A4 (en) * 1989-10-18 1992-12-09 Noritake Co., Limited Plasma display panel and method of manufacturing the same

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3634719A (en) * 1970-09-08 1972-01-11 Owens Illinois Inc Gas discharge display/memory panel having lead oxide coated dielectric plates with decreased aging time
US3716742A (en) * 1970-03-03 1973-02-13 Fujitsu Ltd Display device utilization gas discharge

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3716742A (en) * 1970-03-03 1973-02-13 Fujitsu Ltd Display device utilization gas discharge
US3634719A (en) * 1970-09-08 1972-01-11 Owens Illinois Inc Gas discharge display/memory panel having lead oxide coated dielectric plates with decreased aging time

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0448727A4 (en) * 1989-10-18 1992-12-09 Noritake Co., Limited Plasma display panel and method of manufacturing the same
US5264758A (en) * 1989-10-18 1993-11-23 Noritake Co., Limited Plasma display panel and method of producing the same

Also Published As

Publication number Publication date
DE2219738A1 (de) 1972-11-09
GB1353271A (en) 1974-05-15
FR2134895A5 (https=) 1972-12-08

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