Optical stack for privacy display
US10126575B1 · kind B1 · utility
102Cited by
45References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2018 |
| Grant date | Nov 13, 2018 |
| Priority date | — |
| Expiry date | Jul 18, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A privacy display comprises a spatial light modulator and a compensated switchable liquid crystal retarder arranged between first and second polarizers arranged in series with the spatial light modulator. In a privacy mode of operation, on-axis light from the spatial light modulator is directed without loss, whereas off-axis light has reduced luminance. The visibility of the display to off-axis snoopers is reduced by means of luminance reduction over a wide polar field. In a wide angle mode of operation, the switchable liquid crystal retardance is adjusted so that off-axis luminance is substantially unmodified.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.