Optical touch sensor

Abstract

An optical touch sensor is disclosed which includes a plurality of light emitting bare dies attached directly to a first printed circuit board and placed at a first edge bordering an object surface, the plurality of light emitting bare dies being commonly encapsulated in a first encapsulation having a first reflective surface, and a plurality of light detecting bare dies attached directly to a second printed circuit board and placed at a second edge bordering the object surface across from the first edge, the plurality of light detecting bare dies being encapsulated commonly in a second encapsulation having a second reflective surface, wherein light emitted from the plurality of light emitting bare dies can be detected by the plurality of light detecting bare dies through reflections of the first and the second reflective surface, and wherein a light beam traveling from the first reflective surface to the second reflective surface is above and substantially parallel to the object surface.

Dependencies are inferred from the claim text.