30.2: Single Layer Full Color Cholesteric Display

Abstract

An 80ppi ¼ VGA full color, single layer, Reflex™ display with red, green and blue reflecting sub‐pixels is reported. A phototunable chiral dopant is UV exposed to produce these colors, and polymer walls keep the colors separate after tuning. We will present details of this development and discuss applications.

An effective way to achieve full color cholesteric liquid crystal displays with single liquid crystal mixture and layer

“…Polymer wall formation using polymerization‐induced phase separation (PIPS) between LC and polymer in LC layer was known for an effective way to achieve the good mechanical stability and electro‐optical properties as well. Lots of researches on the polymer walls formation for nematic, smectic, and cholesteric LC cells have been carried out. Recently, our group achieved well configurated and solid polymer wall formation by the optimization of material and process parameters for flexible LCDs …”

40.2: Novel Phototunable Chiral Materials for Single Layer Color Cholesteric Display

“…Cholesteric liquid crystal displays (Ch-LCDs) are reflective displays without using polarizers, compensators, backlights or color filters. The color which they reflect is selected by concentration variation or UV light exposure of a phototunable chiral dopant [1][2][3][4]. The conformation of the phototunable chiral molecules in the liquid crystal can be altered by UV light exposure to result in the change of the helical twisting power (HTP), and then changes the pitch of the cholestric liquid crystal to obtain a different color of reflected light.…”