Privacy screen for a display
US7170680B2 · kind B2 · utility
5Cited by
7References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 6, 2005 |
| Grant date | Jan 30, 2007 |
| Priority date | — |
| Expiry date | May 26, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2413/07
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A privacy screen for a vertically polarized display (e.g., a LCD) that comprises a rotating film, a polarizing film and a birefringent film is described. The privacy screen transmits substantial amounts of light emanating from the display in an orthogonal (or near-orthogonal) direction while not transmitting substantial amounts of horizontal, non-orthogonal light emanating from the display. In this manner, a privacy effect results in that the display is viewable by someone only when that someone is essentially directly in front of the display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.