Active multi-color PBP elements
US10678116B1 · kind B1 · utility
10Cited by
0References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 25, 2018 |
| Grant date | Jun 9, 2020 |
| Priority date | — |
| Expiry date | May 25, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2358/00
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
An active PBP device having a reduced chromatic and angular dependence of focusing power includes a stack of active PBP devices where each PBP LC element of the stack has a birefringence of odd number of half wavelengths at one of the R, G, B color channels, and even number of half wavelengths at remaining ones of the R, G, B color channels. Retarder sheets are used to improve off-axis operation of the active PBP device. The device can be placed near user's eye in a head mounted display.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.