Projection display
US8810913B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 21, 2011 |
| Grant date | Aug 19, 2014 |
| Priority date | — |
| Expiry date | Jan 21, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0123
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The present invention relates to a projection display (10) for displaying an image to a viewer, comprising a curved waveguide (14) made of light transmissive material and having first and second opposed curvilinear surfaces (26, 28), an image-providing light source device arranged to inject collimated image bearing light into the waveguide, an input grating (20) coupled to or within the waveguide to diffract said image bearing light to propagate internally along the curved waveguide by total internal reflection, an output grating (22) provided along a side of the waveguide by which the image bearing light is diffracted out of the waveguide for viewing by the viewer, wherein the input grating and output grating have variable pitch gratings so that a collimated image injected into the waveguide can be output from the waveguide as a collimated image having an increased exit pupil.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.