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Proceedings Paper

Black-on-white polymer-stabilized cholesteric formulations
Author(s): John L. West; Gregory R. Magyar; James J. Francl; Christine M. Nixon
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Paper Abstract

Recent research by Doane, Yang, and Chien demonstrated the use of cholesteric liquid crystals in multiplexed, high resolution, reflective diplays. These materials utilize the bistability of the cholesteric planar and focal conic states for displays with a colored image on a black background. Many commercial applications of these materials, such as electronic books and newspapers, portable faxes and personal data assistants, require, or at least prefer, black-on- white images. We report on relatively high polymer content (equalsV 20% by weight) dispersions of cholesteric liquid crystals that produce a white, reflecting, planar state. The polymer network appears to form cholesteric domains with varying pitch lengths resulting in planar states that reflect in the red, green, and blue portions of the spectrum. Utilizing a black absorbing layer behind a display using these materials offers white images on a black background, or vice-versa.

Paper Details

Date Published: 18 August 1995
PDF: 5 pages
Proc. SPIE 2622, Optical Engineering Midwest '95, (18 August 1995); doi: 10.1117/12.216835
Show Author Affiliations
John L. West, Kent State Univ. (United States)
Gregory R. Magyar, Kent State Univ. (United States)
James J. Francl, Kent State Univ. (United States)
Christine M. Nixon, Kent State Univ. (United States)


Published in SPIE Proceedings Vol. 2622:
Optical Engineering Midwest '95
Rudolph P. Guzik, Editor(s)

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