Color-selective circular polarizer and its use

Details Color-selective circular polarizer and its use Color-selective circular polarizer and its use

1987-06-12

1989-04-04

Evans, Arthur G.

350331R, G02F 1137

Patent

active

048180769

ABSTRACT:
The circular polarizer comprises a liquid crystal cell, the liquid crystal layer (8) of which is present as a so-called "blue phase" and can be exposed to a variable electric field. The blue phase is an optically isotropic chiral phase which, like the cholesteric phase, reflects circularly polarized light within a narrow frequency band and accordingly, in this spectral region, transmits only light which is circularly polarized (in the opposite sense). Under the influence of the field, the reflection band changes its position and can be shifted almost continuously from blue to red by means of relatively small voltage changes.
The circular polarizer can, by means of simple additional measures, for instance by including a color-neutral circular polarizer, be developed into a color modulator and, in particular, it also makes a multi-colored display of information possible.

REFERENCES:
patent: 4525032 (1985-06-01), Hilsum
"Liquid Crystals", by Brown et al. of Jan. 31, 1983, C&EN.
Armitage et al., "Liquid Crystal Blue Phase to Isotropic Transition and Electric Field Response", Mol. Cryst. Liq. Cryst., vol. 64 (Letters), pp. 41-51.
Fedak et al., "Electric Field Induced Changes in the Selective Reflection Band of Cholesteric Liquid Crystals", Mol. Cryst. Liq. Cryst., vol. 64 (Letters), pp. 69-79.
Finn et al., "Cholesteric Blue Phases in Mixtures and in an Electric Field", Mol. Cryst. Liq. Cryst., 1982, vol. 84, pp. 159-192.
Hansen et al., "Liquid Crystal Media for Electron Beam Recording", IEEE Transactions on Electron Devices, vol. Ed-15, No. 11, Nov. 1968.
Schiekel, Manfred, "Ein--und Vielfarbig Anzeigende Elemente mit Nematischen Fluessigkristallen auf der Basis des DAP-Effeckts", Tech. Mitt. AEG-Telefunken 62, (19/2), 3, pp. 113-119.

Affiliated with

Also associated with

Rating

Color-selective circular polarizer and its use does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Color-selective circular polarizer and its use, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Color-selective circular polarizer and its use will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-176211