Improvement in device performance from a mixture of a liquid crystal and photosensitive acrylic prepolymer with the photoinduced vertical alignment method

In a multicomponent nematic liquid crystal (NLC) mixture of a liquid crystal (negative-type NLC) and a photosensitive acrylic prepolymer, photopolymerization upon UV irradiation induces the separation of the LC and photosensitive acrylic prepolymer layers, thereby leading to a vertical arrangement o...

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Published in:Science and technology of advanced materials 2011-12, Vol.12 (6), p.065002-065002
Main Authors: Ho, Czung-Yu, Lin, Fa-Hsin, Tao, Yu-Tai, Lee, Jiunn-Yih
Format: Article
Language:English
Subjects:
Alignment
Anchoring
Copolymers
electro-optical properties
grayscale switching
homeotropic texture
liquid crystal
Liquid crystals
Nematic crystals
Optical properties
Photopolymerization
photosensitive
Photosensitivity
prepolymer
Prepolymers
Response time
Ultraviolet radiation
vertical arrangement effect
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cited_by cdi_FETCH-LOGICAL-c640t-9becb70aadb6c296d062b5ff5aca1896674d6e4a1f0545428f0c598bf8b5b4113
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description In a multicomponent nematic liquid crystal (NLC) mixture of a liquid crystal (negative-type NLC) and a photosensitive acrylic prepolymer, photopolymerization upon UV irradiation induces the separation of the LC and photosensitive acrylic prepolymer layers, thereby leading to a vertical arrangement of LC molecules. In this study, we propose a simple vertical alignment method for LC molecules, by adding a chiral smectic A (SmA∗) liquid crystal having homeotropic texture characteristics to an NLC mixture solution. Measurements of electro-optical properties revealed that the addition of the SmA∗ LC not only strengthened the anchoring force of the copolymer alignment film surface, but also significantly enhanced the contrast ratio (∼73%), response time and grayscale switching performance of the device.
doi_str_mv 10.1088/1468-6996/12/6/065002
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subjects Alignment
Anchoring
Copolymers
electro-optical properties
grayscale switching
homeotropic texture
liquid crystal
Liquid crystals
Nematic crystals
Optical properties
Photopolymerization
photosensitive
Photosensitivity
prepolymer
Prepolymers
Response time
Ultraviolet radiation
vertical arrangement effect
title Improvement in device performance from a mixture of a liquid crystal and photosensitive acrylic prepolymer with the photoinduced vertical alignment method
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