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:
Apr. 16, 1991
Filed:
Jan. 31, 1989
Applicant:
Inventors:
Charles M Hanson, Richardson, TX (US);
Virginia N MacDonald, Lansdale, PA (US);
Assignee:
Varo, Inc., Garland, TX (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340766 ; 340767 ; 340781 ; 340812 ;
Abstract
A video display (38) provides a visual representation of a video signal over a matrix of pixels (40). Each pixel comprises a picture element (64) operable to radiate responsive to an externally applied voltage determined by the video signal. To prevent the intensity of a selected picture element (64) from being dependent upon the threshold potentials of the switching elements connecting the externally applied voltage to the picture elements (64), feedback lines (46) are provided to sense the voltage at the picture element (64). The voltage at the picture element (64) is adjusted until it equals the desired voltage.