Light control device
US11640078B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 2022 |
| Grant date | May 2, 2023 |
| Priority date | — |
| Expiry date | Apr 26, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1337
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A driver circuit applies a voltage such that clarity of a light control sheet is 83% or less to bring the light control sheet into a first state, and applies a voltage such that haze of the light control sheet according to JIS K 7136 is 15% or less to bring the light control sheet into a second state. The clarity is calculated from the following Formula (1): 100×(LC−LR)/(LC+LR) . . . (1) where LC is an intensity of straight light traveling straight along a traveling direction of parallel light entering the light control sheet, and LR is an intensity of narrow-angle scattered light having an angle within ±2.5° relative to the traveling direction of the parallel light, in light that has passed through the light control sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.