Privacy filter apparatus for a notebook computer display
US6765550B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 27, 2001 |
| Grant date | Jul 20, 2004 |
| Priority date | — |
| Expiry date | May 25, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F1/1616
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
The display of a notebook computer includes a privacy filter extending over the display screen to limit the viewing angle within which the image on the screen can be discerned. To allow for normal viewing when the privacy feature is not required, the privacy filter is movable from the screen by sliding into a cavity extending from one side of the screen to be rolled onto a roller or to be stored partly behind the screen. Alternately, a privacy filter is provided that is electrically switchable between a mode in which the viewing angle is limited and a mode in which normal viewing is permitted. The movable privacy filter includes closely spaced louvers surrounded by clear plastic or, alternately, a polarizer. The switchable privacy filter includes a liquid crystal device and a polarizer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.