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Splay-to-Bend Transition-Free Reactive Monomer Modified Pi-Cell

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5 Author(s)
Chen, S.-F.F. ; Dept. of Photonics & Electro-Opt. Inst., Nat. Chiao Tung Univ., Hsinchu ; Chen, H.-M.P. ; Liansing Chow ; Yu-Yun Chang
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A reactive monomer modified Pi-cell (RMM-Pi-cell) comprising a layer of liquid crystal (LC) reactive monomer on one surface was prepared to control the surface pretilt angle. The simulation results suggested that a transition-free Pi-cell can be prepared by asymmetrical cell with one 8 deg pretilt angle and the other surface greater than 47deg when the cell gap was smaller than 4 mum. The nematic reactive monomer layer has a molecular average tilt angle over 80deg which allowed the LC molecules to be arranged in a favored bend state in the asymmetrical cell. The critical voltages cannot be found in all 3-mu m RMM-Pi-cells. The cell retardation data confirmed the initial bend orientation with zero voltage applied. Moreover, the light leakage of dark state was reduced. The contrast ratio of RMM-Pi-cell was improved by a factor of 11 compared with an original Pi-cell without using compensation film.

Published in:

Photonics Technology Letters, IEEE  (Volume:21 ,  Issue: 10 )