17.1: Invited Paper: Optically Isotropic Liquid Crystals for Electro‐optical Devices

Abstract

Optically isotropic liquid crystals show quick response, and enable rubbing free process in LCD fabrication. However there are some specific issues to be solved for mass production. In this paper, the relations between electro-optical properties and preparation condition and the other properties of relatively recent materials are mainly shown.

Recent advances on polymer‐stabilized blue phase liquid crystal materials and devices

“…A PS‐BPLC precursor typically comprises of 70–90 wt % of nematic LC host as switching molecules, 5–10 wt % of chiral dopant to induce blue phase, and 8–15 wt % of photo‐curable monomers and ∼1% of photo initiator for polymer stabilization. Figure shows the chemical structures of some nematic LC compounds, chiral dopants, and monomers . The properties and influence of each component on the PS‐BPLC will be described in details later.…”

“…Indeed, LC hosts with Δε (> 90) have been developed by JNC and by Merck independently. Figure depicts some examples for large Δε LC compounds . Such a large Δε LC would require several polar groups so that its rotational viscosity and response time would increase dramatically.…”