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:
Jun. 13, 1989
Filed:
May. 28, 1987
Robert A Boudreau, Hampton, NH (US);
Robert E Brown, Stratham, NH (US);
GTE Products Corporation, Danvers, MA (US);
Abstract
A thin film electroluminescent display device energized with a rapid burst of pulses during a time less than the decay time of the phosphor yields substantially increased light output. Preferably, a burst of between two and forty pulses having a duration in the range between 5 and 20 microseconds and having alternating polarities is applied to the device. The pulse burst technique is advantageously applied to a dot matrix type EL display panel operating at a 60 Hz refresh rate. For a 512.times.256 element display panel, each row is addressed for approximately 65 microseconds, and four pulses of about 12-15 microseconds each are applied to the EL pixels during each row address time. The pulse burst technique provides increased brightness while minimizing the retained image problem.