Fast gray-to-gray switching of a hybrid-aligned liquid crystal cell

Tae-Hoon Choi; Jung-Wook Kim; Tae-Hoon Yoon

doi:10.1117/12.2076542

11 March 2015 Fast gray-to-gray switching of a hybrid-aligned liquid crystal cell

Tae-Hoon Choi, Jung-Wook Kim, Tae-Hoon Yoon

Proceedings Volume 9384, Emerging Liquid Crystal Technologies X; 938416 (2015) https://doi.org/10.1117/12.2076542
Event: SPIE OPTO, 2015, San Francisco, California, United States

Abstract

We demonstrate fast gray-to-gray (GTG) switching of a hybrid-aligned liquid crystal cell by applying both vertical and inplane electric fields to liquid crystals (LCs) using a four-terminal electrode structure. The LCs are switched to the bright state through downward tilting and twist deformation initiated by applying an in-plane electric field, whereas they are switched back to the initial dark state through optically hidden relaxation initiated by applying a vertical electric field for a short duration. The top electrode in the proposed device is grounded, which requires a much higher voltage to be applied for in-plane rotation of LCs. Thus, ultrafast turn-on switching of the device is achieved, whereas the turn-off switching of the proposed device is independent of the elastic constants and the viscosity of the LCs so that fast turn-off switching can be achieved. We experimentally obtained a total response time of 0.75 ms. Furthermore, fast GTG response within 3 ms could be achieved.

Citation Download Citation

Tae-Hoon Choi, Jung-Wook Kim, and Tae-Hoon Yoon "Fast gray-to-gray switching of a hybrid-aligned liquid crystal cell", Proc. SPIE 9384, Emerging Liquid Crystal Technologies X, 938416 (11 March 2015); https://doi.org/10.1117/12.2076542

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