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:
Feb. 15, 2005
Filed:
Aug. 29, 2003
Futoshi Yamasaki, Yokohama, JP;
Satoshi Nakayama, Yokohama, JP;
Takuya Shiaki, Sagamihara, JP;
Tsutomu Nakashima, Yokohama, JP;
Eiji Yamaguchi, Yokohama, JP;
Nobuyuki Kimura, Yokohama, JP;
Futoshi Yamasaki, Yokohama, JP;
Satoshi Nakayama, Yokohama, JP;
Takuya Shiaki, Sagamihara, JP;
Tsutomu Nakashima, Yokohama, JP;
Eiji Yamaguchi, Yokohama, JP;
Nobuyuki Kimura, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A projection display according to the present invention reduces the size of a light beam in the optical path of an illumination optics from the periphery to change the amount of light incident on a video display device and the angle of such incidence, thereby making a plurality of image brightness/contrast combinations selectable. Further, the present invention changes the revolving speed of a projection display cooling fan and the adjustment value settings for the video display device's electrical characteristics in accordance with the aperture.