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P‐69: Polymer Stabilized Cholesteric Dichroic Dye Displays
Author(s) -
Zhang F.,
Yang D.K.
Publication year - 2002
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 - 10.1889/1.1830833
Subject(s) - materials science , homeotropic alignment , dichroic glass , polymer , bistability , transmittance , hysteresis , polymerization , optics , composite material , optoelectronics , liquid crystal , condensed matter physics , physics
We have developed two types of polymer stabilized cholesteric dichroic dye displays. In the first type, an anisotropic polymer network perpendicular to the cell surface was formed by photo‐polymerization in the homeotropic texture in the presence of an electric field. The polymer network enhanced the hysteresis of the voltage‐transmittance curve, and the material can be operated in bistable mode at a bias voltage in the hysteresis loop. In the second type, a random polymer network was formed by photo‐polymerization in the isotropic phase at an elevated temperature. The polymer network suppressed the hysteresis, and the material can be operated in gray scale mode. The displays had high on‐state transmittance, good contrast ratios, and were suitable for direct view display applications.