Akira Sakaigawa

Improvement of dichroic polymer dispersed liquid crystal performance using lift-off technique

A lift-off method has been developed for the fabrication of polymer dispersed liquid crystal (PDLC) displays. A polymer matrix template can be prefabricated by lifting off a PDLC film from a fluorosilanized antisticking substrate. Desirable liquid crystal can then be backfilled/infiltrated into the template. Applying this technique to fabricate dichroic PDLC yielded a reflectivity of 66% and a contrast ratio of 13.8:1 in 3.8in. quarter video graphics array reflective thin film transistor (TFT) displays. A diffuse layer with melamine-formaldehyde nanoparticles was employed to suppress the metallic glare caused by the reflective back plane. The technique is suitable for various back planes such as flexible, solvent/UV-sensitive, organic TFTs.

A novel polarizer‐free dye‐doped polymer‐dispersed liquid crystal for reflective TFT displays

A novel preparation method for dichroic dye-doped polymer-dispersed liquid crystals has been developed. This was achieved by creating a porous polymer matrix first by washing out the liquid crystal from a polymer-dispersed liquid crystal (PDLC), which is then refilled with dye-doped liquid crystal. Optimizing the liquid crystal used in the refilling results in decreased turn-on voltage and faster response time. Poster-standard reflectivity and newspaper-standard contrast was demonstrated with a 3.8-in. QVGA reflective TFT display with a drive voltage of 10 V.

Nanoparticle‐embedded polymer‐dispersed liquid crystal for paper‐like displays

Abstract— A polymer-dispersed liquid-crystal (PDLC) matrix template embedded with nano/microparticles can be backfilled/infiltrated with a dye-doped liquid crystal for a paper-like reflective display. In this way, a desirable degree of diffusion can be realized to reduce the viewing-angle dependency of a gain reflector and metallic glare without changing other electro-optical properties.

40.3: Distinguished Paper: Nanoparticle Embedded Polymer Dispersed Liquid Crystal for Wide Viewing Angle and Specular Glare Suppression

A polymer dispersed liquid crystal (PDLC) matrix template embedded with nano/microparticles can be backfilled/infiltrated with dye doped liquid crystal, for a paper-like reflective display. In this way, a desirable degree of diffusion can be realized to reduce a diffuse reflectors viewing angle dependency and metallic glare, without changing other electro-optical properties.