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Full‐color photo‐addressable electronic paper using cholesteric liquid crystals and organic photoconductors
Author(s) -
Harada Haruo,
Gomyo Makoto,
Okano Yasunori,
Gan Taijyu,
Urano Chisato,
Yamaguchi Yasuhiro,
Uesaka Tomozumi,
Arisawa Hiroshi
Publication year - 2008
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/jsid16.12.1243
Subject(s) - materials science , cholesteric liquid crystal , color gel , liquid crystal , layer (electronics) , optoelectronics , gelatin , liquid crystal display , monolayer , optics , nanotechnology , chemistry , thin film transistor , organic chemistry , physics
— Full‐color photo‐addressable electronic paper using cholesteric liquid crystals and organic photoconductors was developed. The electronic paper is comprised of two stacked photo‐addressable elements displaying blue/green and red images, respectively. Each photo‐addressable element was independently controlled by two different color‐addressing lights. Furthermore, blue and green images were selectively switched by one organic photoconductor using the threshold characteristics of cholesteric liquid crystals. A highly reflective polymer‐dispersed cholesteric liquid‐crystal (PDCLC) layer was obtained by a new formation process based on the sol‐gel transition behavior of a gelatin matrix and an agar overcoat layer. The PDCLC layer had a close‐packed honeycomb‐like monolayer structure with a flat surface. The A6‐sized prototype had paper‐like features and showed full‐color bistable images instantly written with a viewer‐type writing apparatus.