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Non-Uniformly Patterned Conductors for AC Plasma Displays

IP.com Disclosure Number: IPCOM000050128D
Original Publication Date: 1982-Sep-01
Included in the Prior Art Database: 2005-Feb-10
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Pleshko, P: AUTHOR

Abstract

When an AC plasma display panel is fabricated with uniform conductor line widths, the glow discharge spreads along the conductors as a function of the sustain voltage to maintain a substantially constant current density. When a cell is selected, this glow spread increases interaction between adjacent cells as picture elements, decreasing the operating margin (Vs (max) - Vs (min)) of the panel. This glow spread can be minimized by selecting a discharge gap which is less than the distance between adjacent conductors. However, since the tolerance on the gap becomes larger as the gap is decreased, the anticipated improvement in panel margin is offset.

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Non-Uniformly Patterned Conductors for AC Plasma Displays

When an AC plasma display panel is fabricated with uniform conductor line widths, the glow discharge spreads along the conductors as a function of the sustain voltage to maintain a substantially constant current density. When a cell is selected, this glow spread increases interaction between adjacent cells as picture elements, decreasing the operating margin (Vs (max) - Vs (min)) of the panel. This glow spread can be minimized by selecting a discharge gap which is less than the distance between adjacent conductors. However, since the tolerance on the gap becomes larger as the gap is decreased, the anticipated improvement in panel margin is offset.

Typical representations of characteristic maximum and minimum sustain operation voltages (Vs(max) and Vs(min)) of an AC plasma display cell as a function of cell area are shown in Fig. 1. Within the operating area, the electrode size is constrained by the cell area, assuming a constant discharge gap. Two embodiments of conductor geometry are shown in Figs. 2 and 3. In the Fig. 2 embodiment, solid front and rear conductors 3 and 5, respectively, are configured to provide a discharge gap area 7 such that the electrode configuration constrains the glow. In the Fig. 3 embodiment, solid front vertical conductors 9, corresponding to conductor 3 in Fig. 2, are mated with transparent horizontal conductors 11 to geometrically constrain the glow to the wide area of the tra...