Optical waveguide for directional backlight
US10935714B2 · kind B2 · utility
52Cited by
24References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 22, 2019 |
| Grant date | Mar 2, 2021 |
| Priority date | — |
| Expiry date | Mar 22, 2039 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1323
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switchable directional backlight for a privacy display comprises a waveguide with first and second opposing input ends and a turning film arranged to collect light output from the waveguide for input into a spatial light modulator. The waveguide has an array of light deflecting features arranged on one guiding surface and an opposing planar surface. Light deflecting features are arranged such that light input from the first input end is output with a narrow angular range and light input from the second input end is output with a wide angular range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.