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:
Jul. 02, 2019
Filed:
Nov. 13, 2015
Applicant:
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Inventor:
Teruto Tanaka, Osaka, JP;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04N 9/31 (2006.01); G02B 26/08 (2006.01); G09G 3/00 (2006.01); G09G 3/34 (2006.01); G03B 21/20 (2006.01);
U.S. Cl.
CPC ...
H04N 9/3155 (2013.01); G02B 26/0833 (2013.01); G03B 21/2013 (2013.01); G03B 21/2053 (2013.01); G09G 3/002 (2013.01); G09G 3/346 (2013.01); G09G 3/3413 (2013.01); H04N 9/3111 (2013.01); H04N 9/3114 (2013.01); H04N 9/3158 (2013.01); H04N 9/3161 (2013.01); H04N 9/3164 (2013.01); G09G 2320/064 (2013.01);
Abstract
A projection image display apparatus of the present disclosure is provided with a plurality of light sources, a light combiner combining light rays emitted from the light sources, a light modulation element modulating light emitted from the light combiner, and a projection optical system projecting an image emitted from the light modulation element. The light sources are each controlled by pulse width modulation signals, and duty ratios of the pulse width modulation signals to the light sources differ from each other at least in a part of a set range of an amount of light combined by the light combiner.