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:
Jan. 12, 2016
Filed:
Sep. 27, 2013
Canon Kabushiki Kaisha, Tokyo, JP;
Yutaka Yamaguchi, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, , JP;
Abstract
A projection display apparatus includes a polarization beam splitter, a first phase compensation plate including two layers, and a light modulator. Each layer has a constant axial angle, and an optical axis of each layer inclines with respect to the x axis in an xz plane. The axial angle of the layer closer to the polarization beam splitter among the two layers is larger than the axial angle of the layer farther from the polarization beam splitter. 20°≦θmax−θmin≦80° is satisfied where θmax is a maximum value of the axial angle and θmin is a minimum value of the axial angle. 40°≦θave≦70° is satisfied where θave is an average value of axial angles of the two layers.