Projection type active matrix polymer dispersed liquid crystal display apparatus with particles of liquid crystal material randomly oriented
US5216531A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1991 |
| Grant date | Jun 1, 1993 |
| Priority date | — |
| Expiry date | Aug 23, 2011 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/1334
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An active matrix liquid crystal display element comprising an active matrix substrate having an active element for each electrode for picture element, a counter electrode substrate provided with a counter electrode and a liquid crystal polymer composite material in which a nematic liquid crystal having a positive dielectric anisotropy is dispersed and held in a polymer matrix, said liquid crystal polymer composite material being held between the active matrix substrate and the counter electrode substrate wherein the refractive index of the polymer matrix substantially agrees with the ordinary refractive index (n.sub.0) of the liquid crystal used, characterized in that the refractive index anisotropy .DELTA.n of the nematic liquid crystal used is 0.18 or higher, and the average particle diameter R(.mu.m) of the liquid crystal dispersed and held in the polymer matrix, the aspect ratio A in average of liquid crystal particles, and the specific dielectric anisotropy .DELTA..epsilon., the elastic constant K33(10.sup.-12 N) and the viscosity .eta. (cSt) of the liquid crystal satisfy the following relations: EQU 3(K33/.eta.).sup.0.5 >R/A>0.7(K33/.DELTA..epsilon.).sup.0.5 (1) and EQU 1.3<A…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.