A novel color electrophoretic E-Paper using independently movable colored particles with different threshold fields was proposed for the first time. An a-Si TFT driven two primary colors prototype with red and cyan particles was successfully demonstrated. A full color feasibility was also proved using three primary colored particles (yellow, magenta and cyan), which showed a gamut as wide as that of newsprint.
ExperimentalCholesteric liquid crystal micro-capsules (CLC-MCs) with a perpendicular alignment shell were investigated. The CLC-MC cell showed high contrast ratio up to 17:1, reflectance over 30% and uncolored white appearance in bright state. A photoaddressable electronic paper using the CLC-MC and an organic photoconductor was also demonstrated.Encapsulation: The CLC-MC was fabricated as follows: 1) 1g of CLC, 0.1g of poly-isocyanate and 10g of ethylacetate were mixed as "oil solution", 2) the oil solution was poured into water containing 1% poly-vinylalcohol (PVA) and was emulsified to 9 μm in diameter, and 3) the emulsion was heated at 85℃ for 2 h to form the shell. The poly-isocyanate reacted with water at the oil-water interface to form poly-urea shell as expressed in formula (1) and (2):
A novel photoaddressable electronic paper has been developed. It has a spatial light modulator (SLM) structure that consists of microencapsulated cholesteric liquid crystal and an organic photoconductive layer between flexible plastic thin films.An A6-size prototype E-Paper sheet exhibits greater than 20% reflectivity, a 4:1 contrast ratio and a wide viewing angle. Images transferred by the projection of a 2D image with a 200 ms electrical pulse exhibit nonvolatility without power and excellent stability against deformation of the sheet.
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