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. 15, 2011
Filed:
Feb. 28, 2006
Akihiro Kuwabara, Nara, JP;
Takayuki Kimoto, Osaka, JP;
Yoshio Seki, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A projectordetects a luminance distribution in an effective video period of an inputted video luminance signal, and a coefficient calculating circuitcalculates a correction coefficient Cto correct a gradation (FIG.A). Then, surrounding brightness is detected, and the correction coefficient Cis adjusted based on the surrounding brightness to obtain an adjusted correction coefficient C' (FIG.B). As shown in FIG.C, a luminance can be raised to Q according to a brightness signal even for a pixel of a lowest input luminance by adjusting the correction coefficient. Other correction coefficients in a range of 0 to 255 before adjustment are proportionally distributed to a range of 0 to 255-Q, and added with a correction coefficient Q. A luminance of each pixel which belongs to the effective video period of the video luminance signal is adjusted using the adjusted correction coefficient.