Self-restoration by smectic layer structures of monostable ferroelectric liquid crystal in flexible devices

Hideo Fujikake, Hiroto Sato, Fumito Isaka, Takeshi Murashige, Hiroshi Kikuchi, Taiichiro Kurita, Fumio Sato

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


In this paper, we discuss a self-restoration phenomenon affecting smectic layer deformation and molecular alignment in monostable ferroelectric liquid crystals used for flexible displays. First, the mechanical stability of tilted 'bookshelf structures of smectic layers anchored on substrates using alignment layers was examined by precisely shearing two substrates. The microscopic texture of a monostable ferroelectric liquid crystal showed tolerance to shearing and the self-restoration was thought to be due to a smectic layer reconnection phenomenon, whereas a conventional bistable ferroelectric liquid crystal film generated alignment defects due to the tilting of the stable molecular direction. We then fabricated a flexible monostable device containing fine polymer fiber networks, where anchoring of molecularly aligned polymer fibers led to the observation of monostable liquid crystal switching. A uniform liquid crystal alignment was maintained in a 100mm × 100mm device even after bending more than 10000 times at a minimum radius of curvature of 20 mm, due to the enhanced shearing tolerance of the smectic layer structure.

Original languageEnglish
Pages (from-to)8161-8167
Number of pages7
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number12
Publication statusPublished - 2004 Dec
Externally publishedYes


  • Bending test
  • Flexible display
  • Monostable ferroelectric liquid crystal
  • Shearing test
  • Smectic layer self-restoration

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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