Importance

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Abstract

This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for two dimensional position determination of an object. In one aspect, a first electromagnetic (EM) radiation and a second EM radiation is emitted, along a plane, toward a position-sensing region, the first and second EM radiation each having a respective, different, wavelength. Scattered radiation, resulting from interaction of the emitted first and second EM radiation with an object located in the position-sensing region, is detected. Characteristics of the detected scattered radiation have a correlation with a position of the object in the position-sensing region. A two dimensional position of the object is determined, from the correlation. The position-sensing region may be co-planar with, and/or disposed proximate and parallel to an external surface of a display screen.

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First Claim