A touch sensing apparatus includes; at least one light source which sequentially generates a plurality of lights, a light sensor which faces the at least one light source and outputs a plurality of signals corresponding to a magnitude of the plurality of lights, a light guide plate interposed between the at least one light source and the light sensor to guide the plurality of lights from the at least one light source to the light sensor and a coordinate generator which calculates coordinates of a touch input which occurs on the light guide plate using the signal output from the light sensor corresponding to the touch input.