51.2: Improvement of Reflectance and Contrast Ratio of Low‐Power‐Driving, Bendable, Color Electronic Paper Using Ch‐LCs

Abstract

We have newly developed flexible electronic paper using an easily‐controlled adhesive column spacer that forms cell gaps and improves the aperture ratio without using bead spacers. The reflectance of this new, flexible, full‐color prototype with low‐ power driving is 33%, its contrast is over 6, and it can display 262,144 colors.

Auto‐calibration of drive condition for cholesteric liquid crystal displays

“…Figure shows a prototype of our color e‐paper device . It has the superb display performance of Ch‐LCs, and a thinness and lightness that makes it useful for film substrates.…”

Development and applications of cholesteric liquid crystals

“…Maintaining a uniform film thickness is however important in order to provide a constant voltage requirement over the entire area of the display; several ways of doing this have been used. One way is by using very narrow ribs printed on the flexible surface; this technique has been developed [50] by Fuji and made into a three-layer (blue, green and red) fullcolour e-reader known as FLEPia™. Another method has been to use polymer capsules containing electro-active cholesteric mixtures made using microemulsion techniques [51] related to those used for thermochromic inks and the emulsion coated onto a conducting flexible foil.…”

P‐135: A High Reflectivity Fluorescent Guest‐Host Polymer Network LC Color Display

“…One is a system to absorb specific wavelength light selectively, and the other is a system to reflect specific wavelength light selectively. Examples of the former system are display with conventional color filter, guest-host (GH) liquid crystals display [1] and electrochromic display [2], and examples of the latter system are cholesteric liquid crystals display [3] and micro-electromechanical system (MEMS) display [4]. However a sufficiently bright display has not been realized even by these systems.…”