Jpn. J. Appl. Phys. 38 (1999) pp. 748-754  |Next Article|  |Table of Contents|
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Preparation of Retarders with a Tilted Optic Axis

Peter van de Witte, Jos van Haaren, Jos Tuijtelaars, Sjoerd Stallinga and Johan Lub

(Received September 2, 1998; accepted for publication November 11, 1998)

Foils with a tilted optic axis can be used as compensation foils for active matrix twisted nematic displays. A method is described for preparing these foils. The method makes use of the differences in alignment for liquid crystals at the liquid crystal-air interface and the liquid crystal-substrate interface. The retardation as a function of the angle of incidence was used to analyze the director profile. Layers with tilt angles close to 0° were obtained from a low molecular weight glass-forming liquid crystal and a side-chain liquid crystalline polymer. Layers with high average tilt angles could be obtained by photopolymerizing thin layers of cyanobiphenyl derivatives and a liquid crystalline diacrylate. The tilt angle of the liquid crystal at the liquid crystal-air interface could be varied between 90° in the case of mixtures with high contents of cyanobiphenyl derivatives and to 20° in the case of mixtures with high contents of diacrylates.

URL: http://jjap.jsap.jp/link?JJAP/38/748/
DOI: 10.1143/JJAP.38.748

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