Varifocal display with wavelength tuning
US11520149B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 28, 2020 |
| Grant date | Dec 6, 2022 |
| Priority date | — |
| Expiry date | Feb 24, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0185
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A display device includes a diffractive optical element and a tunable light source operable in different states including a first state and a second state. The tunable light source provides first light having a first wavelength while the tunable light source is in the first state and second light having a second wavelength, distinct from the first wavelength, while the tunable light source is in the second state. The first wavelength and the second wavelength correspond to a first color band. The diffractive optical element is positioned to receive and redirect the first light and receive and redirect the second light. The diffractive optical element has a first focal length for the first light and a second focal length, distinct from the first focal length, for the second light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.