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. 22, 2022
Filed:
Oct. 08, 2018
Beijing Llvision Technology Co., Ltd., Beijing, CN;
BEIJING LLVISION TECHNOLOGY CO., LTD., Beijing, CN;
Abstract
A slab waveguide, comprising a plate having parallel surfaces and a cascade light splitting film. The plate is used for receiving and transmitting incident waveguide light which bears a transmitted image. The splitting film is disposed in the plate, intersects the upper and lower surface of the plate, and is used for reflecting the incident waveguide light out of the slab waveguide to form an actual image. In order to avoid mirror image coincidence, the waveguide needs to satisfy: |arcsin(n×sin(90°−4a+b))−arcsin(n×sin(90°−2a−b))1>2ω, wherein a is an inclined angle between the cascade light splitting film and the lower surface of the plate, b is an inclined angle between central image light of the incident waveguide light and the lower surface of the plate, ω is an image display viewing angle of the transmitted image, and n is the refractive index of the plate.