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:
Aug. 22, 1989
Filed:
Nov. 16, 1988
Applicant:
Inventors:
J R Kinnard, Austin, TX (US);
Dennis N Oliver, Austin, TX (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
3151693 ; 3151694 ; 3151692 ;
Abstract
A very efficient and compact circuit is provided to power an electroluminescent panel as may be used for back lighting liquid crystal displays in portable computers. The capacitance of the electroluminescent panel is incorporated in a series resonant, self-commutating power oscillator. The power oscillator is powered by a DC-to-DC converter and inherently provides the desired sinusoidal output waveform to the reactive load comprising the capacitance of the electroluminescent panel.