Color-preserving variable transmission optical device
US12332524B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 19, 2023 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Sep 19, 2043 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/01
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable transmission optical device (“VTOD”) includes first and second cells in optical communication, each cell having an electro-optic material capable of changing from a state of higher light transmittance to a state of lower light transmittance upon a change of an electric field applied across the electro-optic material. The VTOD is switchable between i) a clear state having chromaticity CCS and a photopic transmission PTCS of at least 20% wherein the first cell and second cell are each in the state of higher light transmission, ii) a first darkened state having chromaticity CD1 and a photopic transmission PTD1 lower than PTCS, and iii) a second darkened state having chromaticity CD2 and a photopic transmission PTD2 that is lower than PTD1. CD1 and CD2 each fall within chroma 2 when their respective PT values correspond to a Munsell value of 5 or less.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.