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. 23, 2019
Filed:
Aug. 14, 2018
Wave Optics Ltd, Maidenhead Berkshire, GB;
David Grey, Maidenhead, GB;
Sumanta Talukdar, Maidenhead, GB;
Wave Optics Ltd., Maidenhead Berkshire, GB;
Abstract
An optical device is disclosed for expanding input light in two dimensions in an augmented reality display. The device comprises a waveguide () and three linear diffraction grat-ings H, H, H. An incident beam from a projector illuminates an input grating Hwith polychromatic light, and the light is coupled into the waveguide (). The other two gratings H, Hare overlaid on top of one another. Light can be diffracted by one grating Hinto a first diffracted order and towards the other grating Hwhich can couple the light out of the waveguide () towards a viewer. In another arrangement the crossed gratings H, Hmay be replaced by a photonic crystal () having a regular array of pillars () which create a number effective diffraction gratings.