Patent ID: 9170683
Filing Date: 2015-10-27
Classification: G02B,G02F,G06F

Abstract:
1. An optical touch-sensitive device comprising: a planar optical waveguide extending over a surface of a display, the waveguide having a top surface and a bottom surface; emitters and detectors arranged along a periphery of the display and below the bottom surface of the waveguide; an optical coupler assembly positioned along the periphery of the display coupled below the bottom surface of the waveguide, the optical coupler assembly coupling optical beams produced by the emitters into the waveguide and out of the waveguide to the detectors, the optical beams propagating through the waveguide via total internal reflection (TIR) off of the top and bottom surfaces of the waveguide wherein touches on the top surface of the waveguide disturb the optical beams, the touch-sensitive device determining touch events based on the disturbances, the optical coupler assembly comprising: