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:
May. 26, 2015
Filed:
Nov. 24, 2009
Applicants:
Shunsuke Okazawa, Tokyo, JP;
Takayuki Okada, Tokyo, JP;
Inventors:
Shunsuke Okazawa, Tokyo, JP;
Takayuki Okada, Tokyo, JP;
Assignee:
NEC Display Solutions, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/16 (2006.01); H04N 5/74 (2006.01); H04N 9/31 (2006.01); G09G 3/34 (2006.01);
U.S. Cl.
CPC ...
G03B 21/16 (2013.01); H04N 9/3155 (2013.01); G09G 3/3406 (2013.01); H04N 9/3144 (2013.01);
Abstract
A projection display device projects light modulated based on a video signal. The projection display device includes a light source, a first fan for cooling the light source, and a second fan different from the first fan. The number of revolutions of the first fan is increased or decreased with the increase or decrease of the output of the light source. The number of revolutions of the second fan is decreased when the number of revolutions of the first fan is increased, and increased when the number of revolutions of the first fan is decreased.