Field-controlled light scattering from polymer-dispersed liquid crystal displays

摘要

Abstract: We have studied the field controlled light scattering in polyvinylbutyrale films containing microdroplets of dispersed smectic A liquid crystal. The polymer dispersed liquid crystals (PDLC) are processed by phase separation technique: solvent induced phase separation. The light scattering is determined by the gradual degradation of focal-conic domains in the high frequency electric field and LC remembers a given state after the field removal. The hysteresis phenomenon common to dispersed nematic LC mixtures can be overcome by use of the smectic A LC display with the field controlled light scattering. Polymer microdroplets increase the field threshold of LC clarity to 1,5-2 time, but field controlled light scattering effect permits the optical disagreement of the polymer and LC medium. The obtained result will be useful for fabrication of cheap grey-scale matrix passive-addressing PDLC displays. !5