Electro-optical response of ferroelectric liquid crystal cells with photo-dimerization alignment layer

Choi, Kyunghan; Kim, Hyun-Wuk; Kim, Jin-Yool; Kim, Tae-Min; Kim, Yong-Bae; Kim, Jong-Duk

doi:10.1016/s0925-3467(02)00217-3

Optical Materials

2003

DOI: 10.1016/s0925-3467(02)00217-3

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Electro-optical response of ferroelectric liquid crystal cells with photo-dimerization alignment layer

Kyunghan Choi

Hyun-Wuk Kim

Jin-Yool Kim

et al.

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Cited by 2 publications

References 11 publications

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Photo-dimerization of a chalcone-based side chain polymer for the alignment of ferroelectric liquid crystals

Choi

Kim

2004

Liquid Crystals

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The alignment and optical properties of ferroelectric liquid crystal cells, having alignment films of a chalcone-based side chain polymer treated by linearly polarized UV irradiation were investigated. The long absorption band of the UV/Vis spectra gradually decreased and the FTIR spectra shifted as the irradiation times increased, indicating that cyclo-addition and isomerization reactions of the chalcone-based side chains occurred. UV dichroism demonstrated anisotropic changes in the alignment films, with a maximum at low exposure energy (0.5 J cm 22 ). Liquid crystal molecules were aligned perpendicular to the polarization direction of the linearly polarized UV radiation. The azimuthal anchoring energy of liquid crystal E7 on a chalcone-based side chain polymer surface increased with exposure energy. Well aligned defect-free cells and high contrast ratio were achieved with irradiation of longer than 5 min; the geometric conditions for a stable C2 structure may be satisfied at low temperature with slowly cooling.

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Photo-dimerization of a chalcone-based side chain polymer for the alignment of ferroelectric liquid crystals

Choi

Kim

2004

Liquid Crystals

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P‐156: Alignment of Ferroelectric Liquid Crystals with the Substrates Processed by Plasma‐Beam

Hegde

Murauski

Chigrinov

et al. 2008

Symp Digest of Tech Papers

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Plasma beam procedure earlier adapted for alignment of nematic liquid crystals and reactive mesogens is successfully applied for alignment of ferroelectric liquid crystals. Highly uniform alignment of “chevron” structure (before electrical treatment) and “quazi bookshelf” structure (after electrical treatment) are realized. In the latter case, the contrast of bistable switching is larger than 350:1 for 650 nm wavelength. This makes the non‐contact plasma alignment procedure especially attractive for high contrast bistable LCD on LCOS base particularly used in PDA and E‐books. Fast switching and realization of gray scale in the plasma beam aligned FLC cells makes this technique also promising for full color displays including color TV LCD.

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Electro-optical response of ferroelectric liquid crystal cells with photo-dimerization alignment layer

Cited by 2 publications

References 11 publications

Photo-dimerization of a chalcone-based side chain polymer for the alignment of ferroelectric liquid crystals

Photo-dimerization of a chalcone-based side chain polymer for the alignment of ferroelectric liquid crystals

P‐156: Alignment of Ferroelectric Liquid Crystals with the Substrates Processed by Plasma‐Beam

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