Fresnel-based varifocal lens assembly for VR or AR displays
US11067724B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 28, 2019 |
| Grant date | Jul 20, 2021 |
| Priority date | — |
| Expiry date | Jul 19, 2039 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N13/322
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A near-eye display system includes a display panel to emit display light representative of a display image and a lens assembly disposed along an optical axis. The lens assembly includes a first phase mask plate having a first major surface facing the display and a second major surface opposite the first major surface, the second major surface implementing a first freeform Fresnel lens structure, and further includes a second phase mask plate adjacent and parallel to the first phase mask plate and having a third major surface facing the second major surface and an opposing fourth majors surface, the third major surface implementing a second freeform Fresnel lens structure. A pose of at least one of the first and second phase mask plates relative to the other is configured to be adjusted so as to adjust an optical power of the lens assembly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.