26.4: Bistable Polymer Dispersed Cholesteric Reflective Display

We have developed a polymer dispersed cholesteric liquid crystal which exhibits two stable states at zero field: reflecting planar texture and non-reflective focal conic texture. Both states have thresholds under driving voltage pulses. The material can be used to make multiplexed displays on passive matrix. Because the liquid crystal is encapsulated, the dispersion can be coated on plastic substrates to make large size displays. Furthermore, it can be used to make single layer full color displays by using a photo-tuning method.