Plasma-beam-processed polyimide films for the alignment of liquid crystal molecules

Tsung Yeh Ho, Chin Yang Lee, Chia Wei Kuo, Fu-Ching Tang, Kang Hung Liu, Horng-Long Cheng, Wei-Yang Chou

Research output: Contribution to journalArticlepeer-review


We demonstrate a plasma-beam-processed polyimide (PI) surface to effectively align liquid crystal (LC) molecules. The pretilt angles of LCs can be varied between 0 and 3.5°, and the PI surface energy can be adjusted by controlling the plasma beam with an energy of 450 eV at an incident angle varying from 0 to 80° with respect to the normal direction of the substrate. Additionally, a method was developed to quickly evaluate the level of anchoring force of LC when compared with a rubbed-aligned LC cell. The performance of this method should be under LC cells with the same alignment materials.

Original languageEnglish
JournalElectrochemical and Solid-State Letters
Issue number12
Publication statusPublished - 2010 Oct 29

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Electrochemistry
  • Electrical and Electronic Engineering

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