Flat-panel optical projection apparatus with reduced distortion
US8491136B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 9, 2012 |
| Grant date | Jul 23, 2013 |
| Priority date | — |
| Expiry date | Apr 9, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N9/3141
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A light guide of the tapered-waveguide type includes an input slab for expanding a projected image between an input end and an output end; and a tapered output slab arranged to receive rays from the said output end of the input slab, and to emit them at a point on its face that corresponds to the angle at which the ray is received. The taper is calculated so that all rays injected into the input end undergo the same number of reflections before leaving the output face. The thickness of the input slab light guide is greater in the transverse direction away from the center line, so that light travelling at the critical angle from the input face of the slab waveguide towards the output waveguide bounces the same number of times in the input slab, regardless of its fan-out angle, in order to further reduce image distortion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.