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:
Jun. 06, 2006
Filed:
Oct. 10, 2003
Akira Momose, Shiojiri, JP;
Atsushi Miyazawa, Suwa, JP;
Keijiro Naito, Shiojiri, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
When a video signal is inputted to a projector () through a video input terminal, a luminance peak value of an image of the video signal is detected by an image-analyzing circuit () to be outputted to a CPU (). A gain-adjusting circuit () adjusts a luminance signal in the video signal based on a command from the CPU (). The CPU () determines a gain adjustment amount based on the luminance peak value of the image obtained by the image-analyzing circuit () and outputs the result to the gain-adjusting circuit (). For instance, when the luminance peak value (Ip) of the image is 50% of the upper limit (Imax) thereof, a gain-adjusting amount AG is doubled. In this case, an illuminating light volume of a light valve () has to be reduced to 50%, which is achieved by light-attenuation by a light-source lamp () and an open/close light shield ().