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US 2020/0004019 A1Published application
Augmented reality (ar) display
AssigneeFusao Ishil
InventorFusao Ishii
Life of this patent
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Abstract
A projection display having an optical waveguide for a see-though display system using Fresnel mirrors is disclosed. A display using this waveguide enables high resolution, free from chroma aberration, wide viewing angle, large eye-box and very compact size.
Claims17
A display system comprising
- a display device and
- a projection lens set and
- a light pipe and
- an in-coupling prism which input light rays from the display device and projection lens set into the light pipe and
- an out-coupling waveguide and
- folding mirrors which reflect the light rays from the light pipe to the out-coupling waveguide wherein
- the light pipe has a rectangular cross-section and the surfaces of the sides of the light pipe are reflective by coating or totally internal reflection (TIR) except an opening and the light rays can exit from the light pipe through the opening toward the folding mirrors which have saw-teeth shaped mirrors and reflect the rays to the out-coupling waveguide and the out-coupling waveguide has multiple saw-teeth shaped mirrors and reflects the rays toward the eye of a viewer.
4 more elements
Dependencies are inferred from the claim text.