INFRARED TOUCH SCREEN DEVICE AND MULTIPOINT LOCATING METHOD THEREOF
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United States of America Patent
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Issued Date -
Aug 30, 2012
app pub date -
Nov 2, 2010
filing date -
Nov 5, 2009
priority date (Note) -
Abandoned
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Abstract
An infrared touch screen device and a multi-touch locating method thereof are provided. On the touch screen, large angle infrared emitting elements and infrared receiving element are used to realize the axis scanning of multi-angle by an optimized sampling and processing circuit. After the data processing of removing ambient light, normalization and so on for original data of the axis scanning, the logic axis touch information is generated, and a luminance map of the current frame is generated according to the information. Multiple valid touch regions are recognized by contrast with a theoretical touch luminance map. Then a tracing algorithm of image is used, and a multi-touch event is outputted finally. The touch device is simple, reliable and accurate and has wide range application.
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