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:
Jan. 01, 1991
Filed:
Jul. 19, 1988
Robert T Flegal, Beaverton, OR (US);
Michael J Ziuchkovski, Portland, OR (US);
Planar Systems, Inc., Beaverton, OR (US);
Abstract
A matrix-addressed AC TFEL panel includes odd- and even-numbered scanning electrodes driven from opposite sides of the panel by separate power supplies. The data electrodes are divided into top and bottom sets so that they are arranged as complementary pairs extending towards each other slightly less than halfway across the screen leaving a small gap in the middle. The odd- and even-numbered scanning electrodes are divided into top and bottom subsets so that the top and bottom halves of the panel may be scanned simultaneously in line-by-line fashion. When an even electrode in the top half of the panel is scanned with a voltage of a first polarity, an odd electrode in the bottom half may be scanned with a voltage of an opposite polarity. Thus, the load for the scanning of the top and bottom halves is divided between positive and negative power supplies. To provide symmetric drive the polarities may be reversed each frame.