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:
Nov. 09, 1993
Filed:
Jun. 07, 1990
Tsutomu Muraji, Nara, JP;
Mitsuru Kotaka, Sakai, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A projection type image display apparatus using a light modulation image display device as a light valve varies the voltage of a video signal so as to correct the nonuniformity of luminance of the optical device so that an image uniform in brightness and color even in peripheral parts can be displayed on a projection screen. A driving circuit contained with the apparatus generates three driving signals for driving three image display devices in accordance with red, green and blue color component signals of an input video signal. The driving circuit includes a correction circuit for correcting the red and blue color component signals independently of one another so that their luminance is commensurate with that of the green color component signal.