Privacy display apparatus
US11070791B2 · kind B2 · utility
52Cited by
51References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 5, 2018 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Nov 5, 2038 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2013/403
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A privacy display comprises a luminance-privacy arrangement and a contrast-privacy arrangement. In a privacy mode of operation, ambient light levels are detected and a visual security level is calculated. At and above a visual security level threshold the luminance-privacy arrangement is operable and below the threshold both the luminance-privacy and contrast-privacy arrangements are operable. Image quality for on-axis users is optimised and high levels of visual security are achieved for off-axis snoopers over a wide range of display illuminance conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.