US3896324A - Gas-discharge display panel with matrix of orthogonal insulating layers - Google Patents

Gas-discharge display panel with matrix of orthogonal insulating layers Download PDF

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Publication number
US3896324A
US3896324A US211920A US21192071A US3896324A US 3896324 A US3896324 A US 3896324A US 211920 A US211920 A US 211920A US 21192071 A US21192071 A US 21192071A US 3896324 A US3896324 A US 3896324A
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Prior art keywords
slabs
electrodes
display panel
network
gas
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US211920A
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English (en)
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Jean Pierre Galves
Jean Philippe Reboul
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Thales SA
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Thomson CSF SA
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J11/00—Gas-filled discharge tubes with alternating current induction of the discharge, e.g. alternating current plasma display panels [AC-PDP]; Gas-filled discharge tubes without any main electrode inside the vessel; Gas-filled discharge tubes with at least one main electrode outside the vessel

Definitions

  • SHEET 3 1 GAS-DISCHARGE DISPLAY PANEL WITH MATRIX OF ORTI-IOGONAL INSULATING LAYERS
  • the present invention relates to gas-discharge display panels.
  • It relates more particularly to panels of the kind in which the display is obtained by using a matrix of insulating material containing gas filled holes.
  • Two transparent plates are provided which are attached to the matrix.
  • Two linear electrically conductive electrode networks are set out on the two transparent plates and crossing the holes. In a plan view of the assembly of the two networks and the matrix, the two networks cross one another at points located within the section of the holes.
  • two layers of insulating material are arranged between the matrix and the two conductor networks, these layers insulating each of the networks from the gas contained in the holes.
  • the matrix additionally acts as a spacer because the two transparent plates are applied on the matrix, the latter then spacing apart the two electrode networks carried by the plates.
  • the matrix must necessarily satisfy the following requirements:
  • the object of the present invention is to overcome these difficulties.
  • FIG. 1 is a transverse section of a gas-discharge display panel of the nearest prior art
  • FIG. 2 is a perspective view of an embodiment of one of the elements involved in the construction of a gasdischarge display panel in accordance with the invention
  • FIGS. 3 and 4 are perspective-cut-away assembly views of gas-discharge display panels in accordance with the invention, utilizing assemblies of the kind shown in FIG. 2;
  • FIGS. 5 and 6 are other examples of assemblies involved in the construction of a panel in accordance with the invention.
  • FIG. 5a is an enlarged detail of FIG. 5.
  • FIG. 1 illustrates a prior art structure for a gasdischarge display panel.
  • first rigid slab 1 upon which there is arranged a network of conductors 2, itself covered by an insulating layer 3 beyond which the ends of the conductors extend, as indicated at the extreme left of the Figure.
  • a second slab 4 carries a network of electrodes 5 which is covered by an insulating layer 6.
  • each of these networks is constituted by mutually parallel conductors, the conductors of the two networks being perpendicular to one another.
  • at least one of the two slabs must be made of a transparent material, glass for example, in order to provide the desired display.
  • the matrix 9 acts as a spacer between the two slabs 1 and 4.
  • the whole of the interior volume within the seal 8, that is to say the volumes 7 and 10, is filled with a gas whose pressure is selected as a function of its nature, of the other characteristics of the panel, and of the operating conditions.
  • FIG. 2 illustrates by way of example, part of one of the structures utilized in the design of a gas discharge display panel in accordance with the invention.
  • a slab 1 for example of thick transparent glass, and, arranged thereon, a network of mutually parallel conductors 2.
  • a network of mutually parallel conductors 2 On the network, in contact with the slab 1, there is deposited an insulating layer 3 of good transparency. Finally, on the insulating layer 3, there is deposited a network of mutually parallel insulating strips 15, perpendicular to the network of conductors 2.
  • the elements 1, 2, 3 are in all respects similar to those used in the construction of the prior art panels and are accordingly manufactured in accordance with one of the prior art techniques using one of the materials conventionally used in these techniques.
  • the thicknesses of the elements 1, 2, 3 are respectively some few mm, some few um and some few hundredths of a mm.
  • the network 15 of insulating strips characteristic of the invention there are made of an insulating material which will withstand the relatively high temperature of 450C, in order to be able without modification to undergo the stoving operations to which the panel is subjected during the course of its manufacture.
  • This material has excellent mechanical strength, in particular in the situation where, as we shall see later, it has to withstand a certain clamping force, and, finally, having a low vapor tension so that the gas discharge conditions are not substantially modified during the operation of the panel.
  • the material of which the bands or strips 15 are made will, depending upon the circumstances, be glass, enamel, silicon resin or an organic polymer such as one of the polyimides, and in this latter context the product Kapton produced by Dupont de Nemours could be mentioned, although this mention is in no way intended to be limitative of the scope of the invention.
  • These strips have a thickness of some few hundredths of a mm.
  • the material of the strips 15 should have the best possible anisotropy in order to prevent diffusion of the discharge in any direction in the plane of the strips 15, without inhibiting diffusion in the direction perpendicular to the strips.
  • the materials referred to hereinbefore generally present such anisotropy in a sufficient degree.
  • the two assemblies are then placed one atop the other with their networks of insulating strips 15 and 16 opposite each other in a manner indicated by the simplified cut-away views of FIGS. 3 and 4, and sealed together at 8.
  • the two assemblies are either in contact with one another through their networks of insulating strips 15 and 16 in this case the two networks play the part of a spacer between the two slabs l and 4, or are maintained at a certain distance from one another, in which case spacers 14 are provided in order to establish the desired interval between the slabs l and 4', in the latter case, the space left between the networks of strips 15 and I6 is very small, being at the most on the order of some few hundredths of a mm.
  • the two slabs l and 4 are made of a transparent material.
  • the insulating strips 15 are provided in a granular material in order to increase the anisotropy referred to hereinbefore.
  • the material of the strips 15 consists in this case of a granulate of one of the materials enumerated hereinbefore. In this case, in order to maintain the material in position during the manufacture of the panel.
  • insulating layer 3 is coated with a thin film of adhesive, not visible in the drawing of FIG. 5, for example a silicon adhesive, in order to ensure that the granulate adheres to the insulating layer 3.
  • the two networks of insulating strips 15 and 16 may be arranged on one and the same slab 1 in a rectangular pattern of the kind shown in the Figure by the application of an adhesive to the insulating component 3, in accordance with this pattern, prior to the deposition of the granulate.
  • the preparation of the panel obviously, in this case as in the preceding cases, involves the provision of a sealing bead and a pumping pip in one of the slabs which pip has been assumed to be located in the cut-away part of the Figures.
  • the rectangular granule arrangement 15, 16 by some other prior art technique, for example by first of all depositing the uniform layer l5, 16 of granular material upon the insulating layer 3 and applying a selective solvent to the layer l5, 16 through a mask of appropriate shape.
  • FlG. 5a is a sectional view, on an enlarged scale, taken on the line AA of FIG. 5.
  • the granular material is deposited upon one of the slabs alone, that is to say upon the insulating layer 3 in the example of the Figure, in a thinly scattered layer 17.
  • the second slab 4 simply carries the network of conductors 5 and the insulating layer 6.
  • the layer comprises at least some few grains of granular material between two successive conductors of the network of conductors 2.
  • these few grains are sufficient to prevent the diffusion of the discharge parallel to the plane of the conductors of the network 2 whilst, conversely, it is found that one or more grains, located on one of the said conductors, does not substantially affect diffusion in the direction perpendicular to the plane of said network.
  • the application of adhesive could usefully be provided, as in the foregoing cases, prior to the deposition of the granular material.
  • a gas discharge display panel comprising:
  • a network of conducting electrodes disposed on each of the inner surfaces of said slabs, the two networks being crossed in such a way that the application of suitable voltages between two electrodes respectively of each network produces a gaseous discharge in the intersection zones of these electrodes;
  • each of said second discontinuous layers being constituted by a network of raised insulating strips orthogonal to the network of electrodes of the corresponding slab so as to allow discharges to be produced in the intersection zones and to prevent the discharges from spreading beyond said zones, the presence of insulating material along the electrodes between their intersection zones preventing the electric field from extending into the gas along said electrodes, said second layers thus assuming the function of a matrix.
  • a display panel according to claim 1 further comprising a spacer being provided between said two slabs, so that said two second discontinuous layers of said two slabs are not in contact.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
US211920A 1970-12-30 1971-12-27 Gas-discharge display panel with matrix of orthogonal insulating layers Expired - Lifetime US3896324A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7047285A FR2187163A5 (de) 1970-12-30 1970-12-30

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US3896324A true US3896324A (en) 1975-07-22

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US (1) US3896324A (de)
DE (1) DE2165756A1 (de)
FR (1) FR2187163A5 (de)
GB (1) GB1372106A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5063327A (en) * 1988-07-06 1991-11-05 Coloray Display Corporation Field emission cathode based flat panel display having polyimide spacers
US6246171B1 (en) * 1997-03-21 2001-06-12 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Gas discharge lamp with dielectrically impeded electrodes

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7600420A (nl) * 1976-01-16 1977-07-19 Philips Nv Elektrische ontladingsinrichting.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631246A (en) * 1950-02-28 1953-03-10 Rca Corp Radiation detection
US3499167A (en) * 1967-11-24 1970-03-03 Owens Illinois Inc Gas discharge display memory device and method of operating
US3602754A (en) * 1969-04-28 1971-08-31 Owens Illinois Inc Capillary tube gas discharge display panels and devices
US3631287A (en) * 1969-09-09 1971-12-28 Owens Illinois Inc Gas discharge display/memory panel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631246A (en) * 1950-02-28 1953-03-10 Rca Corp Radiation detection
US3499167A (en) * 1967-11-24 1970-03-03 Owens Illinois Inc Gas discharge display memory device and method of operating
US3602754A (en) * 1969-04-28 1971-08-31 Owens Illinois Inc Capillary tube gas discharge display panels and devices
US3631287A (en) * 1969-09-09 1971-12-28 Owens Illinois Inc Gas discharge display/memory panel

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5063327A (en) * 1988-07-06 1991-11-05 Coloray Display Corporation Field emission cathode based flat panel display having polyimide spacers
US6246171B1 (en) * 1997-03-21 2001-06-12 Patent-Treuhand-Gesellschaft Fuer Elektrische Gluehlampen Mbh Gas discharge lamp with dielectrically impeded electrodes

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Publication number Publication date
GB1372106A (en) 1974-10-30
DE2165756A1 (de) 1972-07-27
FR2187163A5 (de) 1974-01-11

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