Browse Prior Art Database

Gas Panel Starter

IP.com Disclosure Number: IPCOM000088883D
Original Publication Date: 1977-Aug-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Greeson, JC: AUTHOR

Abstract

One of the problems associated with the operation of gaseous discharge display devices is that of "cold start". This problem requires that at least one electron be available to facilitate starting of the pilot lights in the display panels, which, in turn, provide a source of metastables and charge particles required for discharge device operation. One of the methods employed in the prior art to accomplish this function is the use of a radioactive material, but such materials present problems in licensing, handling and disposal which tend to outweigh their technical merits. A method for providing a "cold start" of a gaseous discharge display device, using the characteristics of the device in combination with a simple circuit arrangement and standard signal levels, is described below.

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Gas Panel Starter

One of the problems associated with the operation of gaseous discharge display devices is that of "cold start". This problem requires that at least one electron be available to facilitate starting of the pilot lights in the display panels, which, in turn, provide a source of metastables and charge particles required for discharge device operation. One of the methods employed in the prior art to accomplish this function is the use of a radioactive material, but such materials present problems in licensing, handling and disposal which tend to outweigh their technical merits. A method for providing a "cold start" of a gaseous discharge display device, using the characteristics of the device in combination with a simple circuit arrangement and standard signal levels, is described below.

Referring to Fig. 1, a series of vertical N lines are formed along with the drive lines in a nonviewing area of the display. The lines are as closely spaced as possible, and in one preferred embodiment are intersected by all the horizontal lines, one row of lines H(1)- H(7) being shown. The circuitry associated with and used to drive the N lines comprises a pair of diodes 3 and 5 and a discrete capacitor 7 which are connected across the vertical drive bus shown as V(x) and V(y). The interelectrode capacitance between the N lines is related to the capacitance of capacitor 7, and the number of N lines is selected such that the capacitance of capacitor 7 is 10 X the integrated capac...