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Touch screen.

Touch screen. At the Society for Information Display (SID) conference in May, 3M Touch Systems Inc., Methuen, MA, unveiled Dispersive Signal Technology (DST), which the company has described as "a fundamentally different approach to touch." Unlike other systems that recognize touch by the interruption of electrical fields, acoustic waves, or infrared light, DST recognizes touch through vibrations made to the substrate. Sensors in each corner measure the vibrational energy and, through advanced digital signal processing, dispersion adjustment algorithms are applied to analyze the signals and report an accurate touch. This approach helps eliminate issues with screen contaminants and surface scratches, while offering enhanced palm rejection, which allows a touch from a finger, gloved hand or stylus to be registered, while a palm and/or object is already resting on the screen's surface. The vibrations from the touch radiate a bending wave through the substrate from the point of contact spreading out to the edges--the other resting items are ignored. DST incorporates features offered by several touch technologies today--exceptional light transmission, stylus support, accuracy, signature capture and all-glass durability--with additional capabilities such as auto configuration and the ability to accommodate various display sizes, such as 30- and 40-in.

Circle 102--3M Touch systems, or connect directly at
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Title Annotation:Technology Spotlight
Author:Mandel, Richard
Date:Jul 1, 2004
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