Effect of polymer polarity on transcription-aligned TN-LCDs for various polyimide surfaces

Dae-Shik Seo, Jin Ho Kim

Research output: Contribution to journalArticle

Abstract

The effect of the polymer polarity of three types of polyimide (PI) on transcription-aligned twisted nematic liquid crystal display (TN-LCD) surfaces has been investigated. Monodomain alignment of the NLC was obtained in cells fabricated by the transcription alingment method on PI surfaces with medium polarity; the LC alignment is attributed to the polarity of the polymer. The threshold voltage of transcription-aligned TN-LCDs was found to decrease with increasing polarity of the polymer. The threshold voltage of a transcription-aligned TN-LCD on PI surfaces with high polarity was almost the same as that of a rubbingaligned TN-LCD. The response time of transcription-aligned TN-LCDs decreased with increasing polymer polarity. The decay time of transcription-aligned TN-LCDs was long in comparison with rubbing-aligned TN-LCDs; this is attributed to the weak anchoring strength between the LC molecules and the PI surface.

Original languageEnglish
Pages (from-to)1813-1816
Number of pages4
JournalLiquid Crystals
Volume26
Issue number12
DOIs
Publication statusPublished - 1999 Jan 1

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Transcription
Liquid crystal displays
polyimides
Polyimides
polarity
Polymers
polymers
Nematic liquid crystals
liquid crystals
threshold voltage
Threshold voltage
alignment
decay
Molecules
cells
molecules

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

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abstract = "The effect of the polymer polarity of three types of polyimide (PI) on transcription-aligned twisted nematic liquid crystal display (TN-LCD) surfaces has been investigated. Monodomain alignment of the NLC was obtained in cells fabricated by the transcription alingment method on PI surfaces with medium polarity; the LC alignment is attributed to the polarity of the polymer. The threshold voltage of transcription-aligned TN-LCDs was found to decrease with increasing polarity of the polymer. The threshold voltage of a transcription-aligned TN-LCD on PI surfaces with high polarity was almost the same as that of a rubbingaligned TN-LCD. The response time of transcription-aligned TN-LCDs decreased with increasing polymer polarity. The decay time of transcription-aligned TN-LCDs was long in comparison with rubbing-aligned TN-LCDs; this is attributed to the weak anchoring strength between the LC molecules and the PI surface.",
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Effect of polymer polarity on transcription-aligned TN-LCDs for various polyimide surfaces. / Seo, Dae-Shik; Kim, Jin Ho.

In: Liquid Crystals, Vol. 26, No. 12, 01.01.1999, p. 1813-1816.

Research output: Contribution to journalArticle

TY - JOUR

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AU - Kim, Jin Ho

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AB - The effect of the polymer polarity of three types of polyimide (PI) on transcription-aligned twisted nematic liquid crystal display (TN-LCD) surfaces has been investigated. Monodomain alignment of the NLC was obtained in cells fabricated by the transcription alingment method on PI surfaces with medium polarity; the LC alignment is attributed to the polarity of the polymer. The threshold voltage of transcription-aligned TN-LCDs was found to decrease with increasing polarity of the polymer. The threshold voltage of a transcription-aligned TN-LCD on PI surfaces with high polarity was almost the same as that of a rubbingaligned TN-LCD. The response time of transcription-aligned TN-LCDs decreased with increasing polymer polarity. The decay time of transcription-aligned TN-LCDs was long in comparison with rubbing-aligned TN-LCDs; this is attributed to the weak anchoring strength between the LC molecules and the PI surface.

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