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A BIPOLAR ADDRESSING SCHEME FOR A THIN FILM TRANSISTOR LIQUID CRYSTAL DISPLAY

IP.com Disclosure Number: IPCOM000024907D
Original Publication Date: 1982-Oct-31
Included in the Prior Art Database: 2004-Apr-04

Publishing Venue

Xerox Disclosure Journal

Abstract

The provision of a thin film transistor (TFT) at each pixel in a liquid crystal display (LCD) is an attractive and viable flat panel scheme. In the simplest form, the TFT functions as an on-off switch to control the electrooptic effect of the liquid crystal medium. In this arrangement, whenever the gate is positively biased with respect to the source, the TFT will act as a closed switch and whenever that same bias is negative the TFT functions essentially as an open switch. Therefore, if the gate-source bias is positive, the maximum voltage across the liquid crystal cell will be equal to the source voltage.