New antiferroelectric liquid crystal (AFLC) cells having a uniquely asymmetric hysteresis response were obtained by using dissimilar surface anchoring on the cell glass plates. In particular, a low surface energy fluorinated block copolymer was deposited by spin-coating on one side and Nylon6 was cured and rubbed on the opposite side. These asymmetric AFLC displays featured an unusually large shift of the hysteresis curve and a fairly stable greyscale when driven with previously designed waveforms. The contrast ratio in both quasi static and dynamic conditions was especially high (ca. 100) for AFLCs. The new findings can shine new light on the current proposed models of asymmetric hysteresis, based on ion currents and charge trapping onto the alignment surfaces.
Asymmetric response induced by low energy surfaces in antiferroelectric liquid crystal cells
MARTINELLI, ELISA;GALLI, GIANCARLO;
2006-01-01
Abstract
New antiferroelectric liquid crystal (AFLC) cells having a uniquely asymmetric hysteresis response were obtained by using dissimilar surface anchoring on the cell glass plates. In particular, a low surface energy fluorinated block copolymer was deposited by spin-coating on one side and Nylon6 was cured and rubbed on the opposite side. These asymmetric AFLC displays featured an unusually large shift of the hysteresis curve and a fairly stable greyscale when driven with previously designed waveforms. The contrast ratio in both quasi static and dynamic conditions was especially high (ca. 100) for AFLCs. The new findings can shine new light on the current proposed models of asymmetric hysteresis, based on ion currents and charge trapping onto the alignment surfaces.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
