Patent ID: 8274495
Filing Date: 2012-09-25
Classification: G06F

Abstract:
1. A device comprising: a display screen; an infrared light source at a periphery of the screen adapted to illuminate objects proximate to the screen surface; an infrared sensor array adapted to detect light reflected from the objects proximate to the screen surface; a proximal barrier adapted to create Moiré patterns on the infrared sensor array using infrared light reflected from the objects proximate to the screen surface; a processing module adapted to convert the Moiré patterns into a discrete Fourier spectrum, wherein peaks of a lower order discrete Fourier spectrum and complex phases of the peaks of the lower order discrete Fourier spectrum are used to determine the location of the objects proximal to the screen; and a plurality of strain gauges at the periphery of the display screen adapted to detect physical contact of the objects with the display screen, wherein the peaks in the lower order part of the spectrum provide radial positioning information for objects proximate to the screen surface, and the complex phases of the lower order Fourier spectrum peaks provide azimuthal positioning information for such objects.