Patent ID: 8319751

Claim:
An apparatus comprising: a light source array comprising a plurality of light sources, each light source of the light source array transmitting a light beam across a face of a display in response to being activated; a light sensor array comprising a plurality of light sensors intermixed in a linear array with the light sources of the light source array, each light sensor of the light sensor array detecting an intensity of each light beam transmitted across the face of the display in response to being activated; a mirror disposed across the display face opposite the light source array, the light sources of the light source array transmitting each light beam to the mirror across the display face, and the light sensors of the light sensor array detecting the light beams reflected from the mirror across the display face; and a controller concurrently activating each light source of the light source array with each light sensor of the light sensor array as a source/sensor pair during a detection cycle while other light sources of the light source array and other light sensors of the light sensor array are inactive, and determining a location of a pointer relative to the display from a pattern of light beam intensities for each source/sensor pair.