PDLC optical displays with LC encapsulated in polymerized vesicles

Optical displays with polymer dispersed liquid crystals have a diffused interphase region between LC droplets and polymer, composed mostly from LC swelling polymer matrix. This interphase region has a different optical characteristic comparing to the bulk material inside LC droplets. For the purpose of reducing volume occupied by the interphase region, we have adopted a procedure used in the liposome reserach. LC with dichroic dye was encapsulated in the vesicles formed by the polymerizable amphiphilic compound Dimethyldioctadecylammonium Methacrylate. After encapsulation, vesicles with LC/dye system inside were UV polymerized and dispersed in the poly(vinyl alcohol) PVA matrix. Changes of the optical transmittances of obtained thin films versus applied electrical field showed symmetrical s-shaped curves but low transmittance changes.

[1]  Paul S. Drzaic,et al.  Reorientation Dynamics of Polymer Dispersed Nematic Liquid Crystal Films , 1988 .

[2]  Koichi Kobayashi,et al.  Adsorbability of dye molecules on Langmuir-Blodgett films of long-chain alkylammonium salts , 1992 .

[3]  James J. Sluss,et al.  Electro-optic performance of a PDLC film utilizing dual-frequency addressing , 1992, Electronic Imaging.

[4]  G. Viscardi,et al.  Dye-Surfactant Interactions and Their Applications , 1991 .

[5]  John L. West,et al.  Surface anchoring, polymer glass transition, and polymer-dispersed liquid crystal electro-optics , 1992, Electronic Imaging.

[6]  Naoki Kinugasa,et al.  Characterization of light scattering in nematic droplet-polymer films , 1992, Electronic Imaging.

[7]  G. Montgomery,et al.  A Light Control Film Composed of Liquid Crystal Droplets Dispersed in a UV-Curable Polymer , 1987 .

[8]  Molecular Orientation in Polymer-Dispersed Liquid Crystals Using Time-Resolved FT-IR , 1993 .

[10]  Kunihiro Ichimura,et al.  Reversible alignment change of liquid crystals induced by photochromic molecular films , 1992 .

[11]  G. P. Montgomery,et al.  Electrical properties of polymer-dispersed liquid crystal films , 1992, Electronic Imaging.

[12]  M. Mucha.  Morphology and optical properties of liquid crystals embedded in polyester resin matrix , 1991 .

[13]  T. Seki,et al.  Modulated photoregulation of liquid crystal alignment by azobenzene Langmuir-Blodgett layers: reversible alignment changes of liquid crystals induced by photochromic molecular films, Part 11 , 1992 .

[14]  M. Mucha.  Response time measurements of liquid crystal dispersed in polyester resin film , 1991 .