Patent ID: 8587564

Claim:
A touch module, comprising: a light emitting part to emit light along a first direction; a light waveguide comprising a first side surface and a second side surface, the light waveguide to transmit light incident from the first side surface to the second side surface, the light emitting part being disposed on the first side surface, and the second side surface being disposed opposite to the first side surface along a second direction substantially perpendicular to the first direction; a frustration layer disposed on the light waveguide, the frustration layer to contact the light waveguide in response to a touch and to frustrate a total internal light reflection; and a light receiving part disposed on the second side surface of the light waveguide, the light receiving part to receive light to detect a position of the touch, wherein the frustration layer comprises a plurality of frustration parts, the total internal light reflection to be frustrated at a contact surface between a frustration part and the light waveguide, and an area of a first frustration part differs from an area of a second frustration part that is spaced apart from the first frustration part.