Marks for privacy display
US11921367B2 · kind B2 · utility
0Cited by
101References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 2022 |
| Grant date | Mar 5, 2024 |
| Priority date | — |
| Expiry date | Oct 13, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2380/10
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A switchable privacy display comprises a spatial light modulator with output polariser, a reflective polariser, a polar control liquid crystal retarder and an additional polariser. The electrodes of the polar control liquid crystal retarder are patterned with a mark. In wide angle and narrow angle operational modes, the electrodes of the liquid crystal retarder are driven such that the mark is not visible. In a mark display state, the electrodes are driven to provide visibility of the mark in reflected light to an off-axis observer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.