Browse Prior Art Database

Concave Display Panel

IP.com Disclosure Number: IPCOM000092089D
Original Publication Date: 1968-Sep-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 57K

Publishing Venue

IBM

Related People

Greeson, JC: AUTHOR [+3]

Abstract

In gaseous discharge panel displays composed of a plurality of closely spaced gas cells, the latter are selectively ignited by application of voltage signals across outer conductors associated with the selected cells. Since the conductors associated with a display device must be substantially transparent, conductors, composed of such material as stannous oxide or gold having relatively high resistivity per unit area, are employed. In gas discharge panels, the thickness of the panel envelope is normally uniform to provide equal field strength of all cells. The upper drawing shows the units of a double concave display panel having center portion 1 containing a plurality of cells 3. An outer convex panel 5 has exterior vertical conductors 7. A second convex panel 9 has exterior horizontal conductors 11.

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Concave Display Panel

In gaseous discharge panel displays composed of a plurality of closely spaced gas cells, the latter are selectively ignited by application of voltage signals across outer conductors associated with the selected cells. Since the conductors associated with a display device must be substantially transparent, conductors, composed of such material as stannous oxide or gold having relatively high resistivity per unit area, are employed. In gas discharge panels, the thickness of the panel envelope is normally uniform to provide equal field strength of all cells. The upper drawing shows the units of a double concave display panel having center portion 1 containing a plurality of cells 3. An outer convex panel 5 has exterior vertical conductors 7. A second convex panel 9 has exterior horizontal conductors 11. When assembled, the panel is sealed after gas is inserted in individual cells 3. Assuming that the cells are ignited by coincident selection, the selection signals can be applied to either end of the associated conductors, such that those cells in the center of the panel are furthest from the drive signal and the IR drop from either end to the center is maximum. The lower side view of the panel shows that minimum cell thickness is provided at the center of the panel. Cell thickness is one of the variables which control the firing potential. By uniformly reducing the cell thickness toward the center of the panel, the IR drop along the select line...