Polymer dispersed liquid crystal (PDLC) display apparatus
US5680185A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1994 |
| Grant date | Oct 21, 1997 |
| Priority date | — |
| Expiry date | Apr 15, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133638
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A polymer dispersed liquid crystal display apparatus has a liquid crystal/polymer medium formed between spatially disposed electrodes formed spatially disposed substrates. The medium includes a polymer phase and a liquid crystal phase having optical axes alignable together in a predetermined direction. A light absorption additive is included in the liquid crystal phase to provide light absorption when said optical axes are aligned in said predetermined direction so that in the presence or absence of an electric field applied between said electrodes, two different conditions are achieved comprising alignment and misalignment of the optical axes of the liquid crystal phase relative to the polymer phase so that in one condition, a light absorption state is created in the medium and in the other condition, a light scattering state is created in the medium. The polymer phase comprises a network including a plurality of continuous strings of particles connected in helicoid formation due to the addition of a chiral component, and this network may also include separate discrete polymer particles. Also a matrix network may be employed. A reflecting surface on the side of the liquid crystal/…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.