THESIS
2009
xviii, 158 p. : ill. (some col.) ; 30 cm
Abstract
The study of inhomogeneous surfaces for liquid crystal alignment has witnessed a rapid growth in recent years. Such alignment is capable of generating high pretilt angles for liquid crystal. Several experiments showed that high pretilt angles could be applied to different applications such as multi-stable displays and No Bias Bend fast response time displays. This type of alignment surfaces generally comprises two kinds of domains favoring different liquid crystal orientations. The arrangement of those domains can be alternating stripped, checkerboard or even patchy patterns....[
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The study of inhomogeneous surfaces for liquid crystal alignment has witnessed a rapid growth in recent years. Such alignment is capable of generating high pretilt angles for liquid crystal. Several experiments showed that high pretilt angles could be applied to different applications such as multi-stable displays and No Bias Bend fast response time displays. This type of alignment surfaces generally comprises two kinds of domains favoring different liquid crystal orientations. The arrangement of those domains can be alternating stripped, checkerboard or even patchy patterns.
A new bi-directional alignment surface is developed. Such alignment surface can be used to control the dynamic flow direction of the liquid crystal. The dynamic flow of the liquid crystal becomes arbitrary controllable by driving voltage. Base on this new alignment layer, a bistable twisted nematic liquid crystal display which switches between untwisted and π-twisted states without surface anchoring energy breaking has been fabricated successfully. Hence, such bistable displays can have large cell gap.
A new inhomogeneous alignment layer is developed. This alignment layer is capable of generating arbitrary pretilt and azimuth angles for the liquid crystal. It is based on stacking both photo-aligned polymer and rubbed polyimide together. The alignment produced is robust. Moreover, the processing window is proved to be maximized and highly repeatable result can be obtained even for large area fabrication.
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