Patent ID: 8456447
Filing Date: 2013-06-04
Classification: G06F

Abstract:
1. A coordinate detection system, comprising: a display screen; a touch surface corresponding the top of the display screen or a material positioned above the screen and defining a touch area; at least one camera positioned outside the touch area and configured to capture an image of space above the touch surface; an illumination system comprising a light source, the illumination system configured to project light from the light source through the touch surface and toward the space above the touch surface in which at least one object can be positioned, wherein the at least one camera is configured to capture the image by detecting light reflected by the at least one object in the space above the touch surface; and a processor configured to execute program code to determine, based on the image captured by the at least one camera, whether the at least one object interferes with the light from the light source projected through the touch surface.