Alternate polarity symmetric drive for scanning electrodes in a

Details Alternate polarity symmetric drive for scanning electrodes in a Alternate polarity symmetric drive for scanning electrodes in a

1988-07-19

1991-01-01

Brier, Jeffery A.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340805, 34082581, 3151693, G09G 330

Patent

active

049821830

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.

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