Journal of the Society for Information Display · 2009 · 105 citations · 14 references
Natural SciencesMaterials EngineeringMaterials ScienceOptical MaterialsPolymer ChemistryPolymer MaterialsLiquid Crystal MaterialsLiquid CrystalsPolymer CrystallinityPolymer StructurePolymer SurfacesPolymer Thin FilmsGrafted Polymer LayersLiquid Crystal AlignmentLiquid Crystal Polymer MaterialsLiquid Crystal PolymersLiquid Crystalline PolymersOptical TransmittancePolymer Surface ModificationRise Time
Abstract— The recent development of polymer‐induced pretilt angle in multi‐domain vertical‐alignment liquid‐crystal (LC) structures is reviewed. To create a small but well‐defined pretilt angle, ∼0.1 wt.% of a photo‐curable monomer was mixed in an LC host and a bias voltage was applied to reorient the LC directors within each domain. The monomers are polymerized near the substrate surfaces by UV exposure. The formed polymer layers change the surface pretilt angle of the LC from 90° to about 89° with a defined azimuthal orientation. Consequently, within each domain the LC reorientation direction responding to the external field is well‐defined which leads to faster rise time and higher transmittance. This new technology overcomes the long standing problems of conventional MVA devices and is therefore expected to play a dominant role in the future.
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Reflective Liquid-Crystal Displays
Tatsuo Uchida, Takahiro Ishinabe · MRS Bulletin · 2002 · 431 citations