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Title: Development of Polymer Cholesteric Liquid Crystal Flake Technology for Electro-Optic Devices and Particle Displays

Abstract

Liquid crystals have had a large presence in the display industry for several decades, and they continue to remain at the forefront of development as the industry delves into flexible displays and electronic paper. Among the emerging technologies trying to answer this call are polymer cholesteric liquid crystal (PCLC) flakes.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Laboratory for Laser Energetics, University of Rochester
Sponsoring Org.:
USDOE
OSTI Identifier:
901728
Report Number(s):
DOE/SF/19460-738
2006-175; 1699; TRN: US200720%%269
DOE Contract Number:
FC52-92SF19460
Resource Type:
Conference
Resource Relation:
Journal Name: Emerging Liquid Crystal Technologies II, edited by L.-C. Chien; Journal Volume: 6487; Conference: SPIE Photonics West, San Jose, CA, 20-25 January 2007
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; LIQUID CRYSTALS; POLYMERS; DISPLAY DEVICES; TECHNOLOGY ASSESSMENT; liquid crystal; cholesteric; polymer; displays; electronic paper

Citation Formats

Kosc, T.Z., Marshall, K.L., Trajkovska-Petkoska, A., Coon, C.J., Hasman, K., Babcock, G.V., Howe, R., Leitch, M., and Jacobs, S.J. Development of Polymer Cholesteric Liquid Crystal Flake Technology for Electro-Optic Devices and Particle Displays. United States: N. p., 2007. Web.
Kosc, T.Z., Marshall, K.L., Trajkovska-Petkoska, A., Coon, C.J., Hasman, K., Babcock, G.V., Howe, R., Leitch, M., & Jacobs, S.J. Development of Polymer Cholesteric Liquid Crystal Flake Technology for Electro-Optic Devices and Particle Displays. United States.
Kosc, T.Z., Marshall, K.L., Trajkovska-Petkoska, A., Coon, C.J., Hasman, K., Babcock, G.V., Howe, R., Leitch, M., and Jacobs, S.J. Thu . "Development of Polymer Cholesteric Liquid Crystal Flake Technology for Electro-Optic Devices and Particle Displays". United States. doi:.
@article{osti_901728,
title = {Development of Polymer Cholesteric Liquid Crystal Flake Technology for Electro-Optic Devices and Particle Displays},
author = {Kosc, T.Z. and Marshall, K.L. and Trajkovska-Petkoska, A. and Coon, C.J. and Hasman, K. and Babcock, G.V. and Howe, R. and Leitch, M. and Jacobs, S.J.},
abstractNote = {Liquid crystals have had a large presence in the display industry for several decades, and they continue to remain at the forefront of development as the industry delves into flexible displays and electronic paper. Among the emerging technologies trying to answer this call are polymer cholesteric liquid crystal (PCLC) flakes.},
doi = {},
journal = {Emerging Liquid Crystal Technologies II, edited by L.-C. Chien},
number = ,
volume = 6487,
place = {United States},
year = {Thu Apr 05 00:00:00 EDT 2007},
month = {Thu Apr 05 00:00:00 EDT 2007}
}

Conference:
Other availability
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  • Polymer cholesteric-liquid-crystal (PCLC) flake/fluid-host suspensions are a novel particle display technology for full-color reflective display applications on rigid or flexible substrates. These “polarizing pigments” require no polarizers or color filters, switch rapidly at very low voltages, and produce highly saturated colors with a reflection efficiency approaching 80%.
  • When flakes of polymer cholesteric liquid crystals (PCLC's) are dispersed in a fluid host and subjected to an applied electric field, their bright, polarization-selective reflection color is extinguished as they undergo field-induced rotation. Maxwell-Wagner (interfacial) polarization is the underlying physical mechanism for flake motion and results from the large difference in dielectric properties of the flake and fluid hosts. Flake reorientation times can be as short as 300 ms to 400 ms at exceedingly low driving fields (10 to 100 mVrms/um) and are dependent on flake size and shape, fluid host dielectric constant and viscosity, and drive-field frequency and magnitude.more » These attributes make this new materials system of special interest in electro-optical and photonics applications, where reflective-mode operation, polarization selectivity, and low power consumption are of critical importance (e.g., reflective displays).« less
  • Polymer cholesteric liquid crystal (PCLC) flake/fluid host suspensions are a new and promising particle display technology for both full-color flexible display applications and electronic paper. Devices containing these "polarizing pigments" switch rapidly at very low voltages and produce highly saturated, circularly polarized reflectance colors without requiring polarizers or color filters.
  • Polymer cholesteric-liquid-crystal (PCLC) flake/fluid-host suspensions are a novel particle display technology for full-color reflective display applications on rigid or flexible substrates. These “polarizing pigments” require no polarizers or color filters, switch rapidly at very low voltages, and produce highly saturated colors with a reflection efficiency approaching 80%.
  • (B204)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 mili-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 formore » electro-optic devices, decorative commercial and consumer products, and displays, particularly electronic paper, are envisioned.« less