Patent ID: 9024914
Filing Date: 2015-05-05
Classification: G06F

Abstract:
1. A touch position detecting apparatus comprising: a light emitting part emitting light; a light waveguide having a uniform refractive index, the light waveguide comprising: a light receiving part adjacent to the light exiting surface and comprising a plurality of light receiving elements respectively receiving the light beams exiting from the light exiting surface; and a detecting part detecting a touch position based on an amount of the light in the light beams received by the light receiving part, wherein the plurality of light beams includes a first light beam incident onto the touch surface with a first incident angle and a second light beam incident onto the touch surface with a second incident angle greater than the first incident angle, the first incident angle set to totally reflect the first light beam into the light waveguide when a first touch element having a first refractive index contacts the touch surface and to partially reflect the first light beam into the light waveguide when a second touch element having a second refractive index different from the first refractive index contacts the touch surface, the second incident angle set to partially reflect the second light beam into the light waveguide when the first touch element contacts the touch surface, the light receiving part receiving the first light beam and second light beam independently, and the detecting part discriminating between the first touch element having the first refractive index contacting the touch surface and the second touching element having the second refractive index contacting the touch surface based on the amount of light received from the first light beam and the second light beam, wherein the light is emitted by a plurality of light emitting elements that each emit one or more light beams and each of the light emitting elements are oriented in a different direction from each other with respect to the light incident surface.