Enhanced privacy switchable backlight system
US11002998B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 31, 2019 |
| Grant date | May 11, 2021 |
| Priority date | — |
| Expiry date | May 24, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2358/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A backlight system controls a viewing angle in a switchable privacy display system that achieves a strong private mode and enhanced brightness in the private and public modes as compared to conventional configurations. The backlight system includes a first backlight unit that emits light from a non-viewing side of the backlight system toward a viewing side of the backlight system; a second backlight unit located on a viewing side of the first backlight unit that emits light toward the viewing side of the backlight system; and a privacy optic that includes a liquid crystal material and is located on a non-viewing side of the second backlight unit and between the first backlight unit and the second backlight unit, wherein the privacy optic operates to transmit light from the first backlight unit in a limited viewing angle range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.