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:
Jun. 02, 2020
Filed:
Oct. 27, 2015
Maxell, Ltd., Otokuni-gun, Kyoto, JP;
Hitachi Industry & Control Solutions, Ltd., Hitachi-shi, Ibaraki, JP;
Koji Hirata, Kyoto, JP;
Masahiko Yatsu, Kyoto, JP;
Toshinori Sugiyama, Kyoto, JP;
Hiroyuki Kajikawa, Kyoto, JP;
Kazuomi Kaneko, Kyoto, JP;
MAXELL, LTD., Kyoto, JP;
HITACHI INDUSTRY & CONTROL SOLUTIONS, LTD., Ibaraki, JP;
Abstract
Provided is a small-sized information display device displaying video image information as a virtual image by use of an eyepiece optical system including a concave mirror having desired reflection characteristics in a specific polarization direction, where a liquid crystal display panel is used as a video image light source. The information display device has a liquid crystal display panel as a flat display forming video image information disposed therein, and includes a virtual image optical system including a member to be projected for displaying virtual images in front of a vehicle by making a video image displayed on the liquid crystal display panel reflect on the member to be projected. The virtual image optical system includes a concave mirror, and a reflective film of the concave mirror has desired reflection characteristics in a specific polarization direction, so that virtual images having uniform brightness and chromaticity can be obtained.