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Browse Prior Art Database

Self Aligned, Patterned Overcoat Material for High Resolution AC Plasma Displays

IP.com Disclosure Number: IPCOM000051405D
Original Publication Date: 1981-Jan-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 3 page(s) / 56K

Publishing Venue

IBM

Related People

Greeson, JC: AUTHOR [+2]

Abstract

One approach to high resolution in large-size plasma display devices is to confine each cell within "walls" such as perforated gas panel assemblies of the type shown in U.S. Patent 3,559,190. However, this introduces problems of priming individual cells within the display. While this can be overcome to some extent by "self-spaced" panels with dielectric ridges running orthogonal to the conductor arrays on both plates, it represents a complex fabrication and alignment process.

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Self Aligned, Patterned Overcoat Material for High Resolution AC Plasma Displays

One approach to high resolution in large-size plasma display devices is to confine each cell within "walls" such as perforated gas panel assemblies of the type shown in U.S. Patent 3,559,190. However, this introduces problems of priming individual cells within the display. While this can be overcome to some extent by "self-spaced" panels with dielectric ridges running orthogonal to the conductor arrays on both plates, it represents a complex fabrication and alignment process.

An improved method for confining the discharge spread along the conductors without the need for dielectric ridges or walls and with a self-alignment characteristic employs a dielectric overcoat having non-homogeneous surface properties. A conventional magnesium-oxide (MgO) overcoat is deposited over the dielectric and a thin layer of a low sputtering material whose secondary emission characteristic is less than that of MgO, e.g., ytterbium oxide, formed over the MgO. After panel assembly, the panel is then burned-in, i.e., operated with all cells lighted for a prescribed interval. A gas mixture, such as a neon- argon Penning mixture or a helium gas mixture, is operated at a high pressure to constrict the glow to the cell area. The thin second layer of overcoat material is sputtered off in the cell areas whereby the MgO is exposed in a self-aligned manner.

Referring to the drawings, Fig. 1 illustrates a section of a gas panel constructed in accordance with the disclosed teaching. The plasma display device includes plates 1, 3, orthogonal conductor arrays 5, 7, dielectrics 9, 11 and dielectric overcoats 13, 15, respectively, of magnesium oxide (MgO). Over MgO layers 13, 15 are layers 17, 19, respectively, of a low sputtering material, as described above. The bottom plate assembly illustrates sputtered areas 21 aft...