Invention Grant
- Patent Title: Pupil expansion
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Application No.: US16090057Application Date: 2017-06-20
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Publication No.: US11009704B2Publication Date: 2021-05-18
- Inventor: Mark Ayres , Kenneth Anderson , Adam Urness , Friso Schlottau
- Applicant: Akonia Holographies LLC
- Applicant Address: US CO Longmont
- Assignee: Akonia Holographies LLC
- Current Assignee: Akonia Holographies LLC
- Current Assignee Address: US CO Longmont
- Agent Michael H. Lyons
- International Application: PCT/US2017/038399 WO 20170620
- International Announcement: WO2017/223121 WO 20171228
- Main IPC: G02B27/01
- IPC: G02B27/01 ; F21V8/00

Abstract:
A device including a waveguide having a first waveguide surface and a second waveguide surface parallel to the first waveguide surface is disclosed. The device may include a first volume holographic light coupling element disposed between the first waveguide surface and the second waveguide surface. The first volume holographic light coupling element may be structured to reflect at least a portion of incident light as reflected light. Incident light for which the first volume holographic light coupling element is structured to reflect may have a first angle of incidence within a total internal reflection (TIR) range with respect a first axis corresponding to a surface normal of the waveguide. Incident light for which the first volume holographic light coupling element is structured to reflect may have a second angle of incidence with respect to a second axis different from the first axis.
Public/Granted literature
- US20190391393A1 PUPIL EXPANSION Public/Granted day:2019-12-26
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