Light modulation by frustration of total internal reflection
US6819471B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 16, 2002 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Nov 3, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1677
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Improvements and modifications are provided in the type of frustrated total internal reflection electrophoretic systems described in U.S. Pat. No. 6,215,920. The improvements and modifications include (a) conforming the rear electrode to the shape of the front electrode; (b) encapsulating the electrophoretic medium and particles; (c) modifying the viscosity of the electrophoretic medium; (d) polymer coating the electrophoretic particles; (e) use of a high volume fraction of electrophoretic particles; (f) tethering the electrophoretic particles to the reflecting sheet; (g) using particles of varying electrophoretic mobility; (h) controlling the shape of the electrophoretic particles; (i) use of a low refractive index layer over the channel electrode; (j) providing cross-walls within the electrophoretic medium; (k) use of two immiscible liquids as the electrophoretic medium; and (I) replacing the electrophoretic particles with ones containing absorbing and/or scattering centers within a light transmissive matrix.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.