Image combiner and image display device
US7068404B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 26, 2005 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Jan 26, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0174
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An image combiner causes light from an image display element to be superimposed on light that is transmitted through a plate-form part positioned in front of the eye of a user. The light from the image display element reaches the eye of the user after being diffracted and reflected by a reflective type HOE inside the plate-form part. The HOE has a third-order or higher phase conversion action that depends on the position on the hologram plane. The distance Rd (calculated in air) between the light source that is on the side of the eyes of the observer during end-use (of the two light sources used to expose the HOE during the manufacture of the HOE) and the HOE is substantially greater than the distance Pd (calculated in air) between the exit pupil of the image combiner and the HOE.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.