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Model for the director and electric field in liquid crystal cells having twist walls or disclination lines
 

Summary: Model for the director and electric field in liquid crystal cells having twist
walls or disclination lines
G. Panasyuka)
and D. W. Allender
Liquid Crystal Institute and Department of Physics, Kent State University, Kent, Ohio 44242
Received 27 December 2001; accepted for publication 20 March 2002
Two examples of the director structure and electric field in patterned electrode liquid crystal cells are
studied using a recently developed calculational model. First, a display cell that exhibits a
homeotropic to multidomainlike transition with twist wall structures has been considered for a liquid
crystal with positive dielectric anisotropy. The model elucidates the behavior of the electric field.
Calculations show good agreement between the model and direct computer solution of the Euler­
Lagrange equations, but the model is at least 30 times faster. Second, the possibility that a cell has
1/2 disclination lines instead of a wall defect is probed. A temperature dependent estimate for the
size of the defect core is given, and the total free energy of the cell with disclination lines was
calculated and compared with the corresponding value for the same cell with wall defect structure.
© 2002 American Institute of Physics. DOI: 10.1063/1.1477613
I. INTRODUCTION
For the last several years liquid crystal displays LCDs
have become increasingly used in laptop computers, TVs and
monitors. The image quality and the resolution of LCDs have

  

Source: Allender, David W. - Department of Physics, Kent State University

 

Collections: Physics