Reflective display utilizing fresnel micro-reflectors
US5995071A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 21, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Nov 21, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133553
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display adapted for use in head mounted display systems. The display includes an array of reflecting pixels, a first light source for illuminating the array of reflecting pixels, and a mask screen located between the light source and the array of reflecting pixels. The mask screen includes a plurality of mask elements, one mask element corresponding to each of the pixels. The mask elements have a first state in which the mask element is transparent and a second state in which the mask element is opaque. The state of the mask element is determined by a potential generated by the corresponding pixel. Each of the pixels includes a reflector for reflecting light from the first light source into a cone having an opening angle and an axis which depends on the position of the pixel in the display and on the telecentricity of the imaging optic. In the preferred embodiment of the present invention, each of the reflectors is an off-axis portion of a diffractive micro Fresnel mirror. A color display is implemented by including additional light sources having wavelengths different from the first light source. The additional light sources are spatially displaced from the first light source an…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.