Twisted liquid crystal pi cell stabilized by polymer-sustained alignment

Chen, Tien-Jung; Cheng, Yuan-Hsin; Wu, Sheng-Ming
December 2008
Applied Physics Letters;12/1/2008, Vol. 93 Issue 22, p221103
Academic Journal
A uniform π-twist liquid crystal (LC) alignment was stabilized in a pi cell by photopolymerization of a minute amount of monomers without using any chiral material. Controlling UV exposure time can vary the LC pretilt angle to achieve a stabilized π-twist state. This type of π-twisted LC cell made using the polymer-sustained alignment has a pretilt angle estimated to be ∼20°. This cell can quickly transform into a bend state at a low driving voltage and shows excellent brightness and optical contrast, as compared with a conventional pi cell and a chiral-doped cell.


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