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:
Apr. 08, 2025
Filed:
Apr. 29, 2022
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Norikazu Yamamoto, Kyoto, JP;
Abstract
A projection display apparatus includes a projection lens unit that projects image light and on which external light including the image light reflected by a projection target is incident, an optical path separation prism, a narrowband retarder plate and an imaging element. The optical path separation prism includes the first prism having first and second surfaces, the second prism having a third surface disposed on a side of projection lens unit, a fourth surface facing the second surface and a fifth surface, and the polarization separation coating being disposed between the second surface and the fourth surface. The narrowband retarder plate aligns the image light into a first polarization state. Light in a second polarization state in the external light is reflected by the polarization separation coating, is totally internally reflected by the third surface, is emitted from the fifth surface, and is received by the imaging element.