Two electro-optical phenomena of liquid-crystal blue phase with cubic lattice structure—(1) a fast and reversible shift in reflection band and (2) a phase transition from blue phase to chiral nematic phase—are observed in this study. By increasing the magnitude of a vertical electric field, the reflected wavelength of the blue phase can be shifted to a longer wavelength in a range of 80 nm within a few ms. This reflection band shift is induced by the reorientation of liquid-crystal molecules constructing double twist cylinders, which induces lattice distortion of the blue phase.

A fast-response polymer-stabilized BPIII device without memory effect and hysteresis effect is demonstrated in this study. The structure of BPIII is stabilized in a wide temperature range more than 10C by polymer network. By adopting in-plane switch, the bright and dark states can be switched reversely in ~0.9 ms. Compared with the other two cubic blue phases, the polymerstabilized-BPIII possesses a great potential for application on fast display. Author Keywordselectro-optic effect, polymer-stabilized BPIII, hysteresis effect, memory effect

A VA-mode PI possessing photo-reactive side chains, has the ability of pretilting LC without any rubbing treatment was demonstrated. With this PI layer, the uniformity of the pretilt distribution would be better than the conventional VA mode, which in turn leads to high quality and much reliable VA LCD.