Dopant Effects on Electro-Thermo-Optical Characteristics in Matrix-addressed Smectic-A Liquid Crystal Displays

作者：Hitoshi Hatoh · 发表于：Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals · 年份：1994 · DOI：10.1080/10587259408028187 · 被引用次数：12 · 研究领域：Liquid Crystal Research Advancements、Photonic Crystals and Applications、Plant Reproductive Biology

Liquid crystal (LC) materials doped with non-mesomorphic or chiral substances are used for the matrix-addressed LC displays based on electro-thermo-optical effect. The influence of phase-transition temerature on driving condition and contrast ratio is investigated. Non-mesomorphic dopants which decrease greatly the thermal stability of LC phase expands the allowance of the driving condition and increases the contrast ratio. The chiral dopants also cause similar effects. However, the effects are not caused by the decrease of the thermal stability but by the twist force of chiral dopants. The minimum signal voltage to make a transparent state is not changed by non-mesomorphic dopant, whereas it increases with increasing the concentration of the chiral dopant. On the basis of our investigation, LC blends with the non-mesomorphic or chiral dopants have been developed. They have not only a wide allowance of driving condition and a high contrast ratio but also a high writing speed.