Optical stack for privacy display
US11099447B2 · kind B2 · utility
13Cited by
52References
30Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 2020 |
| Grant date | Aug 24, 2021 |
| Priority date | — |
| Expiry date | Jul 31, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/01
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A switchable privacy display apparatus comprises a spatial light modulator, a light control film, and a polar control retarder that comprises plural retarders arranged between a display polariser of the spatial light modulator and an additional polariser. The display achieves high image visibility to an off-axis user in a public mode of operation and high image security to an off-axis snooper in privacy mode of operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.