Optical diffuser with high infrared clarity
US12372697B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 2, 2019 |
| Grant date | Jul 29, 2025 |
| Priority date | — |
| Expiry date | Aug 10, 2041 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/305
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical stack (100) includes an optical diffuser (10) and a first reflective polarizer (40) disposed on the optical diffuser (10). For substantially normally incident light and for nonoverlapping first and second wavelength ranges, the optical diffuser (10) has a first scattering rate R1 for at least one wavelength in the first wavelength range, and a second scattering rate R2 for at least one wavelength in the second wavelength range, such that R1/R2 is greater than or equal to 2. The first reflective polarizer (40) may transmit at least 40% of light for a first polarization state for each wavelength in the first wavelength range, may reflect at least 70% of light for an orthogonal second polarization state for each wavelength in the first wavelength range, and transmit at least 40% of light for each of the first and second polarization states and for each wavelength in the second wavelength range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.