Preparation of anisotropic films for liquid crystal display application

Chain-Shu Hsu*, Hwai Len Chen

*Corresponding author for this work

Research output: Contribution to journalConference article

Abstract

The photoinitated polymerization of 2-chloro-1, 4-phenylene bis[4-[6-(acryloyloxy)hexyloxy]benzoate](1M) and trans-1, 4-bis(4-(2-(2,3-epoxypropyloxy)-ethoxy)-phenyl)-cyclohexyldicarboxylate (3M) were studied. Both monomers exhibit a wide temperature range of nematic phase. The monomers were oriented in their nematic phase at a substrate having been coated with polyimide and unidirestionally rubbed with a nylon cloth. During polymerization, the ordering of the LC molecules was fixed, yielding a uniaxially crosslinked network. The clear LC networks exhibit a birefringence between 0.14 and 0.19, depending on the polymerization temperature. Finally, the nonmesogenic diluents, tetra(ethylene glycol) diacryalte and 1,2-bis(2,3-expoxypropyloxy)ethane were mixed with monomers 1M and 3M, subsequently decreasing the birefringences of the obtained LC networks. The LC networks containing non-mesogenic diluent exhibit not only a smaller birefringence but also a weaker birefringence dispersion in the visible region.

Original languageEnglish
Pages (from-to)46-52
Number of pages7
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume3421
DOIs
StatePublished - 1 Dec 1998
EventDiplay Technologies II - Taipei, Taiwan
Duration: 9 Jul 199811 Jul 1998

Keywords

  • Compensation film
  • LC network
  • Liquid crystal display
  • Wide viewing angle

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