Switching of vertical alignment liquid crystal cell doped with carbon nanotubes

Chi-Yen Huang, Ying Ging Lin, Yi Jen Huang

Research output: Contribution to journalArticle

16 Citations (Scopus)

Abstract

We investigate switching characteristics of a vertical alignment (VA) liquid crystal (LC) cell doped with minute amounts of carbon nanotubes (CNTs). The doped CNTs increase the effective elastic constant of the LC-CNT mixture, decreasing the fall time of the cell. However, the doped CNTs disturb the LC alignment, generating complex defects in the cell under voltage supply. The flow motion of the defects generates an optical bounce on the rising edge of the optical response curve of the cell, increasing the rise time of the cell. A step-voltage driving scheme is demonstrated to eliminate the optical bounce and effectively improve the rise time of the cell. Under the CNT doping condition and the step-voltage driving scheme, the response time of the VA LC cell can be reduced to 50% of that of the pristine cell under the conventional driving scheme.

Original languageEnglish
Pages (from-to)6407-6409
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Volume47
Issue number8 PART 1
DOIs
Publication statusPublished - 2008 Aug 8

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Liquid crystals
Carbon nanotubes
carbon nanotubes
liquid crystals
alignment
cells
Electric potential
Defects
Elastic constants
electric potential
Doping (additives)
defects
elastic properties
curves

All Science Journal Classification (ASJC) codes

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

Cite this

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abstract = "We investigate switching characteristics of a vertical alignment (VA) liquid crystal (LC) cell doped with minute amounts of carbon nanotubes (CNTs). The doped CNTs increase the effective elastic constant of the LC-CNT mixture, decreasing the fall time of the cell. However, the doped CNTs disturb the LC alignment, generating complex defects in the cell under voltage supply. The flow motion of the defects generates an optical bounce on the rising edge of the optical response curve of the cell, increasing the rise time of the cell. A step-voltage driving scheme is demonstrated to eliminate the optical bounce and effectively improve the rise time of the cell. Under the CNT doping condition and the step-voltage driving scheme, the response time of the VA LC cell can be reduced to 50{\%} of that of the pristine cell under the conventional driving scheme.",
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Switching of vertical alignment liquid crystal cell doped with carbon nanotubes. / Huang, Chi-Yen; Lin, Ying Ging; Huang, Yi Jen.

In: Japanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers, Vol. 47, No. 8 PART 1, 08.08.2008, p. 6407-6409.

Research output: Contribution to journalArticle

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