A Novel Gray-Scale Method for Ferroelectric Liquid Crystal Displays Utilizing Ultra-Fine Particles

概要

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We have developed a novel gray-scale technique for ferroelectric liquid crystal (FLC) displays. This technique involves the addition of nanometer scale ultra-fine particles into the FLC mixture to produce micro domains, whose threshold voltages vary. Each domain has a different threshold for memory latching and is small enough to cover the full gray scale within one pixel element (less than 3 µm in diameter). Moreover, each domain maintains bistability, that is, this method doesn't inhibit passive-matrix driving. The voltage-transmittance ( V-T) curve of the cell depends on the particle-size distribution, such that if the particle-size distribution is sharp, the gradient of the V-T curve is small and vice versa. By X-ray diffraction analysis, wide tilt angle distribution of the smectic layers, which characterizes this nanometer scale particle-contained FLC, was found. The advantages of this technique are that an analog gray scale is possible and that the V-T curve can be controlled by selecting appropriate particles, which means no fundamental change in the fabrication process is required.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
1997-01-15