Thursday, March 17, 2005

Roll up displays for use in hand-held gadgets will be available for mass production by March 2007 according to co-developer Philips. Working with US based paper pioneer E-ink, Philips have developed a 13cm wide screen which is just 0.1 millimetres thick and can be rolled up so that it is only 15 millimetres in diameter.

The screen, which Philips hope to license to makers of in-car satellite navigation systems, mobile web browsers and smart phones, uses no back light and displays a monochrome image in four shades of grey as well as black and white. According to Philips the screen is able to give a “paper-like contrast”.

The screen consists of a backing layer of plastic film which contains a matrix of transistors. This is topped off with layer transparent “electronic ink” capsules and a layer of clear plastic. The capsules are approximately 50 micrometres in diameter and contain polarised black and white particles. Using the transistors, a pattern of positive and negative charge can be applied which manipulates the particles to form monochrome images.