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Browse Prior Art Database

Dyes for Liquid Crystal Displays

IP.com Disclosure Number: IPCOM000052269D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Engler, EM: AUTHOR [+3]

Abstract

A family of dyes useful for guest-host liquid crystal displays is deriv from tetracyanoethylene.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

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Dyes for Liquid Crystal Displays

A family of dyes useful for guest-host liquid crystal displays is deriv from tetracyanoethylene.

The chemistry for preparing these dyes is quite general and is outlined in the equation

The reaction proceeds at room temperature in solvents, such as tetrahydrofuran, to give near quantitative yields. In order to drive the reaction to the para position, one of the R groups must be alkyl. Compounds of type I are intensely colored, due to a strong internal charge transfer contribution between the electron-deficient and -rich regions of the molecule.

The present family of dyes has absorption maxima around 500 am and extinction coefficients in excess of 50,000. The optical and molecular structure of this class of dyes is suited for liquid crystal display applications.

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