Patent ID: 8716649

Claim:
A device to determine a physical gesture, the device comprising: a single illumination source configured to emit light; a plurality of light sensors configured to detect the light reflected from an object and to output time dependent signals in response thereto; a processing circuit coupled to the plurality of light sensors to analyze the time dependent signals received from the plurality of light sensors and to determine target object directional movement proximate to the plurality of light sensors; and a light modifying wall structure disposed adjacent to the light sensor assembly, the light modifying wall structure configured to selectively block a portion of the light reflected from the object depending on a position of the object relative to the light sensor assembly, the light modifying wall structure comprising a plurality of layers and a plurality of vias, respective ones of the plurality of layers and the plurality of vias offset in a stair-step fashion with respect to a center axis defined perpendicular to a surface of the light sensor assembly.