Browse Prior Art Database

DC Plasma Fluorescent Display with Memory

IP.com Disclosure Number: IPCOM000044719D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Pleshko, P: AUTHOR

Abstract

While AC plasma display panels have been developed and are commercially available, they require very high current handling capability and the number of cells or pixels (picture elements) which may be simultaneously in the ON state is limited. A low current high efficiency display system which retains the memory characteristics of the AC Plasma Display Panel is constructed and operates as follows.

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DC Plasma Fluorescent Display with Memory

While AC plasma display panels have been developed and are commercially available, they require very high current handling capability and the number of cells or pixels (picture elements) which may be simultaneously in the ON state is limited. A low current high efficiency display system which retains the memory characteristics of the AC Plasma Display Panel is constructed and operates as follows.

Referring to the drawings, the plasma discharge current- voltage characteristics shown in Figure 1 are obtained by the structure shown in Figure
2. The characteristics labeled Rg1, Rg2 and Rg3 in Figure 1 illustrate the resistance of different cell size which may be employed in the structure. This structure can be provided by several means. Referring to Figure 2, the exposed metal areas can be defined by means such as anodization of aluminum, or depositing dielectrics over the metal. The area of the cathode is the parameter that determines the resistance of the abnormal glow region and hence the cell's cathode current density in the ON state. Variation in cell areas and hence different cell currents can be used to achieve different brightnesses or different current densities at the anode if so desired using the same operating voltage. By choosing the load line as shown in Figure 1, two stable states (ON, OFF) are obtained.

The glow spread at the anode, as shown in Figure 3, allows one to view the discharge directly if the gas emi...