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Optical touch sensing based on internal scattering in touch surface

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4 Author(s)
Jaehyun Han ; Korea Adv. Inst. of Sci. & Technol. (KAIST), Daejeon, South Korea ; Sangwon Choi ; Seongkook Heo ; Geehyuk Lee

While diffuse-illumination touch sensing has the advantage of being sensitive enough to detect an object over a touch surface, it has the drawback of being unable to distinguish touches from approaches reliably. As a solution to this problem, proposed is a novel optical sensing structure that exploits the phenomenon of internal scattering. A prototype touch surface realising the proposed concept confirmed that it is indeed effective for better touch classification while retaining proximal sensitivity.

Published in:

Electronics Letters  (Volume:48 ,  Issue: 22 )