Compact holographic edge illuminated eyeglass display
US8885112B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 26, 2010 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | Mar 18, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
There is provided a wearable display comprising at least one Switchable Bragg Grating (SBG) device recorded in at least one Holographic Polymer Dispersed Liquid Crystal (HPDLC) layer. Each HPDLC layer is sandwiched between first and second transparent plates to which transparent electrodes have been applied. Each SBG device is characterized in that it provides a grating in a separate switchable region and is clear elsewhere. Each SBG device has a diffracting state and a non diffracting state. The transparent plates and HPDLC layers form a laminar structure which functions as a light guide. In one embodiment of the invention the display magnifies and forms a virtual image of information provided by an external image generator. In one embodiment of the invention the display and forms a virtual image of an image of information encoded in the SBG device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.