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:
Mar. 09, 1993
Filed:
Jan. 26, 1989
Eiichi Yamazaki, Ichihara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When a picture display section (or screen) for high-quality TV system (HDTV system) is used for displaying pictures of ordinary TV system with an aspect ratio different from that of the high-quality TV picture, the blank portions on the screen where no picture is illuminated to display at a brightness level almost equal to a picture mean luminance so that there will be no local variations in the luminace on the screen due to deterioration of fluorescent materials on the screen. For this purpose, the picture display portion is moved over the screen; or the video signals are attenuated toward the ends of the picture display portion. As a result, the variations in luminance on the screen become small and unnoticeable.