Directional illumination apparatus and privacy display
US11016341B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 2020 |
| Grant date | May 25, 2021 |
| Priority date | — |
| Expiry date | Sep 11, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L25/0753
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A directional illumination apparatus comprises a waveguide with a reflective surface comprising reflective pairs of light input facets, reflective light extraction facets and an output transmissive surface. An array of micro-LEDs is arranged to illuminate the reflective surface in a rearwards direction. The pairs of light input facets direct light within the waveguide and reflective light extraction facets cooperate to provide a uniform output illumination across the output aperture of the waveguide with collimated light. A thin and efficient illumination apparatus may be used for high dynamic range display backlighting, privacy display or environmental illumination applications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.