Control of variable-focus lenses in a mixed-reality device for presbyopes
US12019246B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2023 |
| Grant date | Jun 25, 2024 |
| Priority date | — |
| Expiry date | Jul 11, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02C2202/24
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Variable-focus lenses are arranged as a lens pair that work on opposite sides of a see-through optical combiner used in a mixed-reality head-mounted display (HMD) device. An eye-side variable-focus lens is configured as a negative lens over an eyebox of the see-through optical combiner to enable virtual-world objects to be set at a close distance. The negative lens is compensated by its conjugate using a real-world-side variable-focus lens configured as a positive lens to provide an unperturbed see-through experience. For non-presbyopes, the powers of the lenses are perfectly offset. For presbyopes, the lens powers is mismatched at times to provide simultaneous views of both virtual-world and real-world objects on the display in sharp focus. Responsively an eye tracker indicating that the user is engaged in close viewing, optical power is added to the real-world-side lens to push close real-world objects optically farther away into sharp focus for the presbyopic user.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.