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. 23, 2018
Filed:
Dec. 12, 2014
Bae Systems Plc, London, GB;
Michael David Simmonds, Rochester, GB;
Anthony Robert Ferns, Rochester, GB;
BAE SYSTEMS plc, London, GB;
Abstract
A waveguide for a display apparatus comprising a planar optical waveguide part () for guiding light to be displayed, an input diffraction grating () to diffract received light () along the optical waveguide part for guiding thereby, an intermediate diffraction grating () to receive diffracted light from the input diffraction grating and to expand the received light in a first dimension by diffraction (), and an output diffraction grating () to receive the expanded light and to output the received expanded light () from the optical waveguide part by diffraction for display. The input diffraction grating is positioned so as to be located wholly within the geographical area of the intermediate grating, and the grating vectors of the input diffraction grating and the intermediate diffraction grating are oriented in different respective directions.