Black-on-white polymer-stabilized cholesteric formulations

John L. West; Gregory R. Magyar; James J. Francl; Christine M. Nixon

doi:10.1117/12.216835

18 August 1995 Black-on-white polymer-stabilized cholesteric formulations

John L. West, Gregory R. Magyar, James J. Francl, Christine M. Nixon

Proceedings Volume 2622, Optical Engineering Midwest '95; (1995) https://doi.org/10.1117/12.216835
Event: Optical Engineering Midwest '95, 1995, Chicago, IL, United States

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.

Citation Download Citation

John L. West, Gregory R. Magyar, James J. Francl, and Christine M. Nixon "Black-on-white polymer-stabilized cholesteric formulations", Proc. SPIE 2622, Optical Engineering Midwest '95, (18 August 1995); https://doi.org/10.1117/12.216835

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