한국전기전자재료학회논문지 (Journal of the Korean Institute of Electrical and Electronic Material Engineers)

  • 제32권4호
  • /
  • Pages.302-306
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  • 2019
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  • 1226-7945(pISSN)
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  • 2288-3258(eISSN)
한국전기전자재료학회 (The Korean Institute of Electrical and Electronic Material Engineers)
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고유전율 Yttrium Oxide을 이용한 네마틱 액정 디스플레이의 고속 응답 전기-광학 특성

Fast Switching of Twisted Nematic Liquid Crystals Display Based on a High-K Yttrium Oxide

  • 투고 : 2019.04.08
  • 심사 : 2019.05.04
  • 발행 : 2019.07.01
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초록

We investigated a solution-derived $Y_2O_3$ film treated by ion beam (IB) irradiation as a liquid crystal (LC) alignment layer. With IB irradiation, homogeneous LC alignment was achieved irrespective of the annealing temperature. To verify the effect of IB irradiation, we conducted surface analyses such as X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). As $Y_2O_3$ is a high-k material, the electro-optical properties of the twisted nematic (TN) cells were superior to those of conventional TN cells based on a rubbed polymer, with an LC rising time of 4.1ms and falling time of 2.9ms. The IB-irradiated $Y_2O_3$ is a good alternative as an alignment layer for fast-switching TN LC displays.

키워드

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Fig. 1. Configuration of TN LC cell based on IB-irradiated Y2O3 film.

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Fig. 2. POM images of anti-parallel cells with IB irradiated Y2O3 films at different annealing temperature.

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Fig. 3. Pretilt angle of LC molecules on IB-irradiated Y2O3 films at different annealing temperature.

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Fig. 4. Contact angle of water drop on IB-irradiated Y2O3 film deposited on glass substrates at different annealing temperature.

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Fig. 5. SEM images of solution-processed Y2O3 film deposited on glass substrates annealed at 400℃ (a) without IB irradiation and (b) with IB irradiation.

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Fig. 6. XPS spectra of Y 3d from as-deposited Y2O3 films and IB-iorradiated Y2O3 at annealing temperature of 400℃.

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Fig. 7. V-T characteristics of TN-LC cells with IB-irradiated Y2O3 films.

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Fig. 8. Response time of TN-LC cells with IB-irradiated Y2O3 films (a) rise time and (b) fall time.

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