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Driving Lutetium Phthalocyanine Electrochromic Displays

IP.com Disclosure Number: IPCOM000052798D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Barclay, DJ: AUTHOR [+3]

Abstract

The conventional way of driving a lutetium phthalocyanine electrochromic display is to anodically write from the green state to the red#tan state. This results in a display with red-tan characters on a green background. Problems can arise in integrating this type of display on a silicon chip because of difficulties in designing the current sources in n-channel FET technology.

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Driving Lutetium Phthalocyanine Electrochromic Displays

The conventional way of driving a lutetium phthalocyanine electrochromic display is to anodically write from the green state to the red#tan state. This results in a display with red-tan characters on a green background. Problems can arise in integrating this type of display on a silicon chip because of difficulties in designing the current sources in n-channel FET technology.

This problem can be solved by inverting the write procedure. The erased state (not red-tan) is achieved by holding the potential of the picture element at a positive potential. Writing is performed by applying a cathodic current pulse to form the green state. Current sources to generate pulses of this polarity are easily designed in standard m-channel FET technology. The appearance of the display is now green characters on a red-tan background.

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