Optical touch sensing structure with enhanced light transmittance and manufacturing method thereof

摘要

An optical touch sensing structure (100') includes a transparent substrate (110) and a stacked transparent optical layer (120'). The transparent substrate has an upper surface (112). The stacked transparent optical layer is disposed on the upper surface of the transparent substrate with a portion of the upper surface being exposed. The stacked transparent optical layer (120') is formed by stacking at least one first transparent optical layer (122') and at least one second transparent optical layer (124'). The refractive index of the first transparent optical layer is greater than the refractive index of the second transparent optical layer. The stacked transparent optical layer is adapted to allow a visible light to pass through and has a rough surface (125'). When an infrared light is incident to the stacked transparent optical layer, the infrared light is reflected by the stacked transparent optical layer and scattered by the rough surface (125').