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P‐94: Polymer Cholesteric Liquid Crystal Flakes for Particle Displays
Author(s) -
Kosc Tanya Z.,
Marshall Ken L.,
Jacobs Stephen D.
Publication year - 2003
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.1832342
Subject(s) - polarizer , liquid crystal , backlight , materials science , optoelectronics , electric field , cholesteric liquid crystal , optics , liquid crystal display , polymer , polarization (electrochemistry) , particle (ecology) , birefringence , composite material , chemistry , physics , oceanography , quantum mechanics , geology
Polymer cholesteric liquid crystal (PCLC) flakes suspended in a moderately conductive host fluid reorient in the presence of an AC electric field within a specific frequency range, causing a dramatic change in flake reflectivity. PCLC flakes reflect light of a specific color and (circular) polarization, thereby eliminating the need for backlighting, color filters, and polarizers to attain unique optical effects. Reorientation can be seen in fields as low as several milli‐volts per micron, and reorientation times are on the order of several hundred milliseconds, thereby approaching response times for both nematic liquid crystal displays and other particle displays. Applications for electro‐optic devices, decorative commercial and consumer products, and displays, particularly electronic paper, are envisioned.