Pupil expander cailibration
US11156829B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 29, 2019 |
| Grant date | Oct 26, 2021 |
| Priority date | — |
| Expiry date | May 22, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B2027/0178
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A near-eye display (NED) using a pupil expander to expand an eyebox of the NED may suffer from local variations of throughput and color reproduction introduced by the pupil expander of the display. To offset or compensate these variations, the pupil expander, e.g. a pupil-replicating waveguide, may be characterized at a plurality of non-uniformly spaced grid of test points, with the test points disposed more densely at areas of high spatial variation of the throughput or color shift introduced by the pupil expander. The throughput or color shift may be integrated over at least a portion of the field of view of the NED. To determine the areas of high spatial variation, an initial test may be performed at uniformly spaced test grid locations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.