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34.3: Drawing‐Induced Biaxiality Change from a Positive C to a Negative A Plate and Its Application in Wide Viewing Angle IPS LCDs
Author(s) -
Yang YoungCheol,
Yang DengKe
Publication year - 2010
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 - 10.1889/1.3500504
Subject(s) - birefringence , isotropy , optics , viewing angle , materials science , evaporation , polymer , composite material , physics , liquid crystal display , thermodynamics
Mechanical drawing is widely used to induce the optical birefringence (positive A or negative C plates) in optically isotropic polymer films. We propose a method to make the optical films having the optical biaxiality lying in between that of the positive C and the negative A plates (n x < n y < n z ) utilizing the solvent evaporation and the mechanical drawing processes. A theoretical model is proposed to calculate the birefringence induced by the processes. Numerical calculation shows that the biaxial film drawn properly can widen the viewing angle of IPS mode LCDs.