Patent ID: 8878820
Filing Date: 2014-11-04
Classification: G06F

Abstract:
1. An optical touch module used in a flat display, comprising: a transparent substrate, comprising: a touch surface and a sub-surface parallel to the touch surface; and a surrounding side surface connected to the touch surface and the sub-surface; and two light processing units positioned on two neighboring corners of the transparent substrate, wherein each light processing unit has a light source and a detector respectively having a light emitting surface and a light entry surface, the light emitting surface of the light source and the light entry surface of the detector both face the surrounding side surface, and each light processing unit is positioned beneath the touch surface, wherein, each of the two corners comprises: a chamfer surface whose one side is connected to the touch surface, wherein the chamfer surface is perpendicular to the touch surface; and a sloping surface whose one side is connected to the other side of the chamfer surface and the other side is connected to the sub-surface, wherein an inclination angle is formed between the sloping surface and the sub-surface and corresponds to the total reflection critical angle of the transparent substrate.