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P‐138: Improvement of Optical Compensated Bend (OCB) and Vertical Alignment (VA) Mode Liquid Crystal Displays by Nano‐Alignment Technique
Author(s) -
Chen WeiHong,
Wang ShiaFan,
Lin HongCheu,
Mo YungLung,
Chuang YunChing,
Chen SzuFen Fenny
Publication year - 2009
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3256637
Subject(s) - materials science , thermogravimetric analysis , liquid crystal , polyimide , scanning electron microscope , nanoparticle , polymer , curing (chemistry) , chemical engineering , composite material , layer (electronics) , nanotechnology , optoelectronics , engineering
Surface‐modified silicon oxide (SiO 2 ) nanoparticles containing surfactants with amino end‐groups were synthesized. The amounts of surfactants anchoring on SiO 2 nanoparticles were characterized to research 8 wt% by thermogravimetric analysis (TGA). The characteristic amino peak of surfactants on SiO 2 nanoparticles can also be confirmed by nuclear magnetic resonance (NMR) spectroscopy. By spin‐coating reactive surface‐modified SiO 2 nanoparticles on the pre‐cured polyimide (PI), amino end‐groups of the surfactants can be further reacted with pre‐cured PI layer over the ITO surface by thermo‐curing. Moreover, the distribution of post‐cured nanoparticles in the optical compensated bend (OCB) and vertical alignment (VA) cells have been investigated by scanning electron microscope (SEM). As a result, the newly developed nano‐alignment technique with different process conditions, such as various particle sizes and concentrations, can be applied to improve the threshold voltage, response time, and pre‐tilt angle in the OCB and VA mode liquid crystal display (LCD) cells.