An optical configuration for a horizontally-switched reflective LCD that could provide high reflectance as well as high contrast is proposed. We have shown that the proposed configuration can provide a flat reflection spectrum with very high reflectance in the bright state experimentally and theoretically.
We have observed a phenomenon associated with a transition from vertical alignment to an optically compensated splay structure. With rubbed homeotropic alignment in parallel directions, the device shows vertical alignment but the liquid crystals (LCs) are twisted 180° in the absence of an electric field. Depending on the voltage applied, two different configurations of LCs are possible. After applying a critical voltage, the LC configuration becomes splayed such that the middirector lies parallel to the substrate and around it, and a hybrid structure forms symmetrically. A method for obtaining the transition and the electro-optic characteristics of the device is discussed.
We propose optical configurations for reflective liquid crystal displays that can be applied to most of display modes with the 0 o twisted state. Optimized configuration can be obtained by using a cell with quarter-wave retardation or with half-wave retardation. Especially, a half-wave reflective cell provides the highest brightness in the bright state as well as the lowest brightness in the dark state. By fabricating reflective halfwave cells, we demonstrated high brightness as well as the high contrast ratio of 20:1.
In this work, we studied the effect of d/p ratio, cell gap, and the temperature on the matrix‐addressed operation of a bistable TN LCD. By characterizing a unit cell, we can optimize cell parameters for matrix addressing. We also found that IX material with small temperature dependence is required for high‐speed operation of a high‐resolution bistable TN LCD.
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