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. 18, 2000
Filed:
Apr. 10, 1997
Applicant:
Inventor:
Yoshiharu Chikazawa, Kanagawa-ku, JP;
Assignee:
Thomson multimedia S.A., Boulogne Cedex, FR;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G03B / ; G03B / ; G03F / ;
U.S. Cl.
CPC ...
349116 ; 353 97 ; 358519 ;
Abstract
Known LCD projectors, used for example in TV sets, can only be manually adjusted for the compensation of the changing color spectrum of the lamp due to its aging process. An LCD projector according to the invention further comprises an image sensor to measure the light intensity of the lamp. In a color adjusting circuit the image color is compensated as a function of the measured signal by controlling the LCD valve.