Diffraction optics diffusing screen laminate for full color on-axis viewing
US4960314A · kind A · utility
56Cited by
13References
34Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 5, 1988 |
| Grant date | Oct 2, 1990 |
| Priority date | — |
| Expiry date | Jul 5, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03H2260/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical screen module for full-color, on axis viewing is described. The module has a transmission holographic optical element, a louver filter, and a diffraction optics diffusion screen. Input light is diffracted off-axis by the transmission holographic element, passed through the louver filter and rediffracted on-axis by the diffusion screen. The module can handle full-color light because the dispersion in the transmission hologram is compensated by that in the diffusion screen. The louver filter blocks the undiffracted zero-order light while allowing the light diffracted by the transmission hologram to pass through.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.