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:
Feb. 14, 2017
Filed:
Mar. 17, 2015
Seiko Epson Corporation, Tokyo, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
An optical device includes a light guide plate; a first diffraction element that is a transmission type diffraction element provided on a first face of the light guide plate and that diffracts and ejects at least a portion of light which is guided along inside the light guide plate; a second diffraction element that is a transmission type diffraction element provided on the first face of the light guide plate and that diffracts at least a portion of light proceeding to the light guide plate; and a third diffraction element that is a reflection type diffraction element provided on a face which is an opposite face of the light guide plate from the first face, and that diffracts at least a portion of light which enters an inside of the light guide plate via the second diffraction element.