Splay-to-bend transition-free reactive monomer modified Pi-cell

Szu Fen F. Chen*, Huang-Ming Chen, Liansing Chow, Yu Yun Chang, Han-Ping Shieh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


A reactive monomer modified Pi-cell (RMM-Pi-cell) comprising a layer of liquid crystal (LC) reactive monomer on one surface was prepared to control the surface pretilt angle. The simulation results suggested that a transition-free Pi-cell can be prepared by asymmetrical cell with one 8° pretilt angle and the other surface greater than 47° when the cell gap was smaller than 4 μm. The nematic reactive monomer layer has a molecular average tilt angle over 80° which allowed the LC molecules to be arranged in a favored bend state in the asymmetrical cell. The critical voltages cannot be found in all 3-μm RMM-Pi-cells. The cell retardation data confirmed the initial bend orientation with zero voltage applied. Moreover, the light leakage of dark state was reduced. The contrast ratio of RMM-Pi-cell was improved by a factor of 11 compared with an original Pi-cell without using compensation film.

Original languageEnglish
Pages (from-to)636-638
Number of pages3
JournalIEEE Photonics Technology Letters
Issue number10
StatePublished - 15 May 2009


  • Display
  • Liquid crystal device
  • Liquid crystal display (LCD)
  • Liquid crystals (LCs)

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