Computer modelling of the director configuration in a supertwist nematic liquid crystal cell |
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| Authors: | Harish K Singh S C Jain S Chandra |
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| Institution: | 1. National Physical Laboratory , Dr K. S. Krishnan Marg, New Delhi , 110012 , India;2. N.M.R. Facility , Central Leather Research institute , Adyar, Madras , 600020 , India;3. National Physical Laboratory , Dr K. S. Krishnan Marg, New Delhi , 110012 , India |
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| Abstract: | Abstract The director distribution in a supertwist nematic cell, containing La-Roche liquid crystal mixture 3010, has been studied extensively using Berreman's computer simulation approach. It is seen that the director distribution in the cell depends critically on the total twist angle θt, the surface tilt angle θo and the ratio of the cell thickness to the pitch d/p. The values of θo and φt have been optimized to yield a small bistability (ΔV = 0.06 V) and a relatively large change in the midplane tilt angle (Δθm = 51°) in an unstrained cell with ?t = (d/p) × 360°. The optimum values of θo and Øt were found to be 15° and 240°, respectively. The effect of varying d/p on the director distribution has also been studied in great detail in supertwist cells with θo = 30° and Øt = 270°. Some interesting features in understrained and overstrained cells have been observed. |
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