The effect of surface orientation on the operation of multiplexed twisted-nematic devices
- 1 October 1976
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Transactions on Electron Devices
- Vol. 23 (10) , 1176-1182
- https://doi.org/10.1109/t-ed.1976.18565
Abstract
The voltage and angular dependence of the electro-optic transfer characteristic of a twisted-nematic display are strongly affected by the average orientation (tilt bias) of the liquid-crystal molecules at the solid surfaces enclosing the fluid. A cell made with low tilt bias of the liquid-crystal molecules has a much sharper threshold in its electro-optic transfer curve and much better viewability when operated in a multiplexed mode than a display with a high tilt bias of the liquid-crystal molecules. As an example, a four-digit multiplexed twisted-nematic display of low tilt bias is viewable over a solid angle of about II/2 sr; whereas a high tilt-bias twisted-nematic device operating under the same multiplexing conditions is only viewable over a solid angle of about 0.50 sr.Keywords
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