Angle-insensitive multi-wavelength optical filters with hue control
US10928569B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2018 |
| Grant date | Feb 23, 2021 |
| Priority date | — |
| Expiry date | Apr 24, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/003
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
One embodiment can provide a laminate film for optical filtering. The laminate film can include a flexible substrate, one or more Bragg-reflector stacks positioned on the flexible substrate, and a high-refractive-index layer positioned on the one or more Bragg-reflector stacks. A respective Bragg-reflector stack has a number of layers with alternating refractive indices, and the Bragg-reflector is configured to have a stopping band with a predetermined center wavelength. A refractive index of the high-refractive-index layer is greater than that of an adjacent layer of the one or more Bragg-reflector stacks, thereby reducing incident-angle sensitivity of the one or more Bragg-reflector stacks. Moreover, at least one Bragg-reflector stack is configured to achieve a predetermined hue.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.