Generation of the pretilt angles and electro-optical properties of nematic liquid crystal aligned on the rubbed plastic-based films

Jeong Yeon Hwang, K. I.Hyung Nam, Jong Hwan Kim, Dae Shik Seo

Research output: Contribution to journalConference article

Abstract

We have investigated the generation of pretilt angle for a nematic liquid crystal (NLC) with rubbing alignment method on polyimide (PI) surfaces using thin plastic substrates. The NLC pretilt angles generated are about 3° by the rubbing alignment method on thin plastic substrates. However, the pretilt angles are at about 1.7° lower on the glass substrate than on thin plastic substrate. We obtain that AFM (atomic force microscope) image of rubbed PI surface with polymer film has formed the micro-groove structure at the low curring temperature (720°C). However, no grooves are obtained on the glass substrate at the same temperature. The tilt angle increases with increasing baking temperature for making PI layer using glass substrate. Also, EO characteristics of the TN-LCD with a rubbed PI surface based on polymer are almost the same as that of the TN-LCD with a rubbed PI surface based on glass. However, the transmittances of the TN-LCD with a rubbed PI surface based on polymer is less than that with a rubbed PI surface based on glass.

Original languageEnglish
Pages (from-to)[189]/45-[195]/51
JournalFerroelectrics
Volume309-312
DOIs
Publication statusPublished - 2004 Dec 1
Event9th International Conference on Ferroelectric Liquid Crystals, FLC 2003 - Dublin, Ireland
Duration: 2003 Aug 242003 Aug 29

Fingerprint

Nematic liquid crystals
polyimides
Polyimides
plastics
Optical properties
liquid crystals
Plastics
optical properties
Glass
Substrates
Liquid crystal displays
glass
grooves
Polymers
polymers
alignment
baking
Polymer films
Temperature
transmittance

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

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title = "Generation of the pretilt angles and electro-optical properties of nematic liquid crystal aligned on the rubbed plastic-based films",
abstract = "We have investigated the generation of pretilt angle for a nematic liquid crystal (NLC) with rubbing alignment method on polyimide (PI) surfaces using thin plastic substrates. The NLC pretilt angles generated are about 3° by the rubbing alignment method on thin plastic substrates. However, the pretilt angles are at about 1.7° lower on the glass substrate than on thin plastic substrate. We obtain that AFM (atomic force microscope) image of rubbed PI surface with polymer film has formed the micro-groove structure at the low curring temperature (720°C). However, no grooves are obtained on the glass substrate at the same temperature. The tilt angle increases with increasing baking temperature for making PI layer using glass substrate. Also, EO characteristics of the TN-LCD with a rubbed PI surface based on polymer are almost the same as that of the TN-LCD with a rubbed PI surface based on glass. However, the transmittances of the TN-LCD with a rubbed PI surface based on polymer is less than that with a rubbed PI surface based on glass.",
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Generation of the pretilt angles and electro-optical properties of nematic liquid crystal aligned on the rubbed plastic-based films. / Hwang, Jeong Yeon; Nam, K. I.Hyung; Kim, Jong Hwan; Seo, Dae Shik.

In: Ferroelectrics, Vol. 309-312, 01.12.2004, p. [189]/45-[195]/51.

Research output: Contribution to journalConference article

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T1 - Generation of the pretilt angles and electro-optical properties of nematic liquid crystal aligned on the rubbed plastic-based films

AU - Hwang, Jeong Yeon

AU - Nam, K. I.Hyung

AU - Kim, Jong Hwan

AU - Seo, Dae Shik

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