We introduce a simple method for fast switching of vertically-aligned nematic liquid crystals (LCs). When an electric field is applied to a patterned vertical alignment (PVA) LC cell, virtual walls are formed in the middle of the gaps between and at the center of the patterned electrodes. These virtual walls formed in a PVA cell results in the turn-off time being dependent on the pitch of the patterned electrodes as well as the cell gap. Therefore, a short response time can be achieved by fine patterning of pixel electrodes without requiring additional fabrication steps or complicated drive schemes. A similar behavior has been observed in switching of vertically-aligned LCs with positive dielectric anisotropy by an in-plane electric field.
Tae-Hoon Yoon, Tae-Hoon Choi, Yeongyu Choi, Jae-Hyeon Woo, and Byoung-Gyu Jeon, "Fast switching of vertically-aligned nematic liquid crystals by two-dimensional confinement with virtual walls," Proc. SPIE 10556, Advances in Display Technologies VIII, 1055607 (Presented at SPIE OPTO: January 31, 2018; Published: 19 February 2018); https://doi.org/10.1117/12.2289367.
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