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:
Dec. 03, 2013
Filed:
Apr. 08, 2008
Masutaka Inoue, Hirakata, JP;
Seiji Tsuchiya, Ootsu, JP;
Susumu Tanase, Kadoma, JP;
Yoshinao Hiranuma, Hirakata, JP;
Takaaki Abe, Osaka, JP;
Masahiro Haraguchi, Daito, JP;
Masutaka Inoue, Hirakata, JP;
Seiji Tsuchiya, Ootsu, JP;
Susumu Tanase, Kadoma, JP;
Yoshinao Hiranuma, Hirakata, JP;
Takaaki Abe, Osaka, JP;
Masahiro Haraguchi, Daito, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
A projection display apparatus includes: a light amount sensor which detects an amount of light emitted from an array light source; a deterioration rate calculator which acquires an amount of light of a measurement target light source from the amount of light detected by the light amount sensor; a reference light amount storage which stores a reference amount of light of an amount of light emitted from plurality of solid state light sources, for each of the solid state light sources; and a light source controller which controls the amount of light emitted from the plurality of solid state light sources for each of the solid state light sources, and the deterioration rate calculator determines whether the measurement target light source has deteriorated, in accordance with a result of a comparison between the amount of light detected by the light amount sensor, and the reference amount of light.