The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1978
Filed:
May. 27, 1976
James Bryce Trushell, Saugerties, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
To compensate for the relatively wide variation in the electrical operating parameters of a gaseous discharge device resulting from varied physical characteristics, the amplitude of the signal used to sustain a discharge is determined, generated and controlled as a function of the physical characteristics of the panel. In operation, a plurality of sample cells are used for control purposes, and the sustain signal applied to the sample cells is incremented from zero during each sustain cycle until the sample cells are discharged, to determine the minimum sustain signal V.sub.S min. required to sustain the discharge. An offset circuit is used to increase the sustain signal by a predetermined amount above the V.sub.S min. level for panel operation, and a voltage regulator is connected in a closed loop arrangement with the sustain generator to automatically adjust the sustain signal to compensate for variation in the physical parameters of the device due to aging.