Hybrid anchoring for a color-reflective dualfrequency cholesteric liquid crystal device switched by low voltages

Yu Cheng Hsiao, Ivan V. Timofeev, Victor Ya Zyryanov, Wei Lee

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Cholesteric liquid crystal (CLC) materials used in electro-optical (EO) devices are characterized by high operating voltage and slow response speed, which hinders their further development in display applications. Dual-frequency CLCs (DFCLCs) can solve the problem of slow bistable transition, but the operating voltage is still high, especially in colorreflective DFCLC cells. Here we report a simple approach to lowering the switching voltage as well as to shortening the response time. This technique adopts hybrid surface treatment to modulate the structural arrangement of CLC molecules. Both planar- and vertical-alignment layers are employed and coated on one and the other substrates separately to improve the electro-optical properties of DFCLCs. We show that the threshold voltage for switching can be decreased to as low as 5 V and the shortest response time is measured to be 0.8 ms, which renders CLC EO devices including displays more practical for commercial purpose.

Original languageEnglish
Pages (from-to)2715-2720
Number of pages6
JournalOptical Materials Express
Volume5
Issue number11
DOIs
Publication statusPublished - Jan 1 2015
Externally publishedYes

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Cholesteric liquid crystals
Electrooptical devices
Color
Electric potential
Display devices
Threshold voltage
Surface treatment
Optical properties
Molecules
Substrates

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

Cite this

Hybrid anchoring for a color-reflective dualfrequency cholesteric liquid crystal device switched by low voltages. / Hsiao, Yu Cheng; Timofeev, Ivan V.; Zyryanov, Victor Ya; Lee, Wei.

In: Optical Materials Express, Vol. 5, No. 11, 01.01.2015, p. 2715-2720.

Research output: Contribution to journalArticle

Hsiao, Yu Cheng ; Timofeev, Ivan V. ; Zyryanov, Victor Ya ; Lee, Wei. / Hybrid anchoring for a color-reflective dualfrequency cholesteric liquid crystal device switched by low voltages. In: Optical Materials Express. 2015 ; Vol. 5, No. 11. pp. 2715-2720.
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