Reverse mode microdroplet liquid crystal light shutter displays

Details Reverse mode microdroplet liquid crystal light shutter displays Reverse mode microdroplet liquid crystal light shutter displays

1989-07-17

1991-10-15

Hille, Rolf

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

428 1, 359 93, 359103, G02F 113

Patent

active

050568981

ABSTRACT:
A reverse mode liquid crystal light shutter and display device is field-off transparent and field-on non-transparent (i.e., scattering and/or absorbing). The reverse phase mode is obtained by modification of the surface energy of the polymer which encases liquid crystal droplets via reaction of a surfactant, incorporated inside of the LC droplets during droplet formation, within the inside polymer layer. The reverse phase transparent "off" state is achieved by refractive index matching of the average refractive index (.about.n.sub.o) of the LC droplets at electric field off state with the refractive index of the containing polymer materials and by obtaining appropriate droplet size and shape and polymer surface energy to cause the major axis of the liquid crystal molecule to be oriented perpendicular to the substrate surface. The inner surface layer aligns the liquid crystal molecules in an homeotropic manner in a resultant composite multi-layer microcapsulate with a homogeneous material for the capsule skin. A compressive force, such as obtained by rapid drying or application of external pressure, is used to provide the correct droplet shape and resulting homeotropic alignment.

REFERENCES:
patent: 4425029 (1984-01-01), Funada et al.
patent: 4435047 (1984-03-01), Fergason
patent: 4685771 (1987-08-01), West et al.
patent: 4688900 (1987-08-01), Doane et al.
patent: 4944576 (1990-07-01), Lacker et al.

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