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:
Sep. 05, 2000
Filed:
Jun. 19, 1998
Applicant:
Inventors:
John Barrett George, Carmel, IN (US);
Dal Frank Griepentrog, Indianapolis, IN (US);
Assignee:
Thomson Licensing S.A., Boulogne Cedex, FR;
Primary Examiner:
Int. Cl.
CPC ...
H04N / ; H01G / ;
U.S. Cl.
CPC ...
348806 ; 315382 ;
Abstract
A direct current focus voltage applied to a focus electrode of a cathode ray tube that produces a blue image is set to slightly defocus the blue image for increasing the blue beam spot size. The increase in the blue beam spot reduces the saturation and allows brighter blue and increased blue video drive range. A passive network is coupled between an ultor electrode and the focus electrode to provide tracking of focus voltage-to-ultor voltage ratio. The tracking prevents voltage fluctuation of the ultor voltage produced by video loading from disturbing uniform defocussing in the entire blue image.