• 한국정보디스플레이학회:학술대회논문집
• /
• 2008.10a
• /
• pp.1283-1285
• /
• 2008

We describe how the phenomenon of dielectric dispersion in nematic liquid crystals influences the director dynamics and thus the switching speed of nematic-based displays.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2009.10a
• /
• pp.159-162
• /
• 2009

A liquid crystalline monomer is applicable to fabricate a retarder in which various types of alignment are fixed. We have developed the monomer, UV-curable liquid crystal optimized for coating processes. Applications and materials for the retarder are reviewed.

• Journal of Information Display
• /
• v.5 no.3
• /
• pp.14-17
• /
• 2004

We have developed a new type of transflective liquid crystal display (LCD) with a single cell gap and a single LC mode. In our transflective configuration, a single LC mode of a 60$^{\circ}$ twisted nematic LC was used for both transmissive and reflective applications. The measured electro-optic characteristics of our transflective LC cell agree well with numerical simulation results. Moreover, the transmittance was found to show similar behavior to the reflectance.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
• /
• v.27 no.5
• /
• pp.303-306
• /
• 2014

In this paper, by using a dual frequency liquid crystal material, we propose a liquid crystal device with a fast response characteristics. The dual frequency liquid crystal material has a positive dielectric anisotropy value at a low frequency. With a high frequency, the dielectric anisotropy becomes negative. Therefore, the relaxation process is governed by not only the elastic deformation, but also the dielectric interaction. The measured decay time and rise time were 0.88 ms and 0.33 ms, respectively.

• Journal of Information Display
• /
• v.2 no.3
• /
• pp.32-38
• /
• 2001

The most important parameter for TV application of LCD is a fast switching time for the display of moving image. To achieve faster switching time, the novel LC single materials with large dielectric anisotropies ($16{\sim}20$), high clearing temperatures ($195.5{\sim}237.4^{\circ}C$), broad nematic ranges (up to 169.9 $^{\circ}C$) and high birefringence ($0.254{\sim}0.2200$) were developed. KUR-series LC mixtures blended these single materials having significantly higher clearing temperatures and dielectric anisotropy values compared with conventional LC mixture. Especially, their clearing temperatures are $10{\sim}30^{\circ}C$ higher than their host mixture. These LC mixtures showing about lOms of high-speed switching time in Tv/Monitor of TFT LCD, is short enough to be addressed in a single time frame of 60Hz (16.7 ms). The threshold voltage $V_{th}$ was low enough to operate at a driving voltage of 5 V. The VHR values were found to be high enough for TFT-LCD in wide temperature range. Our novel LC mixtures are suitable materials for the inclusion in to LC mixtures for TV application of TN-LCD

• 한국정보디스플레이학회:학술대회논문집
• /
• 2004.08a
• /
• pp.1178-1178
• /
• 2004

• Journal of Information Display
• /
• v.2 no.4
• /
• pp.15-18
• /
• 2001

We report simple techniques to manufacture low-powered, high-resolution, reflective cholesteric displays using flexible plastic substrates. We use wax transfer printing to replace photo-lithography and incorporate polymer walls to increase the mechanical strength and lifetime of the displays. These printing methods can easily be adapted to roll-to-roll production.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2003.07a
• /
• pp.277-282
• /
• 2003

Computational calculations are now successfully introduced to design liquid crystal molecules for uses in modern active-matrix displays. These material technologies are practically applied to develop novel compounds, enabling formulation of advanced liquid crystal mixtures together with a newly developed mixture purification method. Typical examples of these liquid crystal mixtures are introduced for modern displays in various applications.

• 한국정보디스플레이학회:학술대회논문집
• /
• 2007.08a
• /
• pp.303-306
• /
• 2007

Recent studies in the literature have shown that it is possible to overcome the limitations of the physical properties of liquid crystals by the doping of carbon nanotubes. Although still in its infancy, the potential of such a new approach for opportunities in display applications should not go unnoticed.

• Journal of Information Display
• /
• v.4 no.3
• /
• pp.26-28
• /
• 2003

In the paper, we investigated the Bragg reflective cholesteric display based on polymer stabilization. We studied the bistability in the polymer stabilized cholesteric texture (PSCT) films and baused on which we achieved wider viewing angle though imperfect planar texture.