Title

Birefringent properties of cyclic block copolymers and low-retardation-film development

Authors

Authors

W. J. Zhou; C. Diehl; D. Murray; K. A. Koppi; S. Hahn;S. T. Wu

Comments

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Abbreviated Journal Title

J. Soc. Inf. Disp.

Keywords

Optical film; birefringence; low retardation; polarizer; LCD; ZERO-BIREFRINGENCE; OPTICAL-PROPERTIES; CRYSTAL; COMPENSATION; DEFORMATION; FRACTURE; POLYMER; Engineering, Electrical & Electronic; Materials Science, ; Multidisciplinary; Optics; Physics, Applied

Abstract

Cyclic block copolymers (CBCs) are a new class of optical polymers made by fully hydrogenating block copolymers of styrene and conjugated diene. This class of materials has excellent optical transparency, photostability, and good thermal resistance. By changing the copolymer composition and the resulting block-copolymer morphology, a unique set of birefringence properties can be achieved. The focus of this work was to study various sources of birefringence in block copolymers using a series of model CBC materials. One particularly interesting finding relates to the development of an ultra-low-phase-retardation CBC film. Unlike the conventional approach of using an additive or blend, a CBC film prepared by melt extrusion can readily achieve near-zero retardation in both the film plane and thickness direction. This nearly isotropic CBC film is useful as a polarizer protection film in flat-panel displays. When used as the inner protective layer of a polarizer, CBC film helps to reduce the color shift of IPS-LCDs at oblique angles and offer a wider viewing angle.

Journal Title

Journal of the Society for Information Display

Volume

18

Issue/Number

1

Publication Date

1-1-2010

Document Type

Article

Language

English

First Page

66

Last Page

75

WOS Identifier

WOS:000273023400011

ISSN

1071-0922

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