Novel pdlc type display based on cellulose derivatives

M. H. Godinho, A. F. Martins, J. L. Figueirinhas

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

A novel type of PDLC display utilizing solid films obtained from the cellulose derivative hydroxypropylcellulose (HPC) with molecular weights of 60 000 (HPC60 000) and 100 000 (HPC100 OW), cross-linked with two different di-isocyanates, 1,4-di-isocyanatobutane (BDI) and 1,6-di-isocyanatohexane (HDI), is presented. This kind of display (optical cell) is composed of a porous elastomeric film (20-60pm thick) of HPC-BDI or HPC-HDI, impregnated with a nematic liquid crystal and contained between two transparent conducting substrates. The electro-optic behaviour of several optical cells is studied as a function of film thickness, the molecular weight of the polymer and the cross-linking agent. The preliminary studies presented in this work show that these systems present good contrast, high transmissivity in the on state and switching times in the range of some milliseconds to hundreds of milliseconds.

Original languageEnglish
Pages (from-to)373-376
Number of pages4
JournalLiquid Crystals
Volume20
Issue number3
DOIs
Publication statusPublished - 1 Jan 1996

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