Patent ID: 9213444
Filing Date: 2015-12-15
Classification: G06F

Abstract:
1. A touch device, comprising: a light guide unit having at least one light incident surface and a first surface connected to the light incident surface; a light emitting unit disposed beside the light incident surface and capable of emitting an invisible light beam, wherein the invisible light beam enters the light guide unit from the light incident surface and is transmitted in the light guide unit; an invisible light filter contacted tightly with the first surface, corresponding to a size of the first surface, and capable of blocking an ambient light beam from entering the touch device, wherein the ambient light beam has a wavelength distribution which substantially corresponds to a wavelength distribution of the invisible light beam; an invisible light detector capable of detecting the invisible light beam, and the light guide unit disposed between the invisible light filter and the invisible light detector; and at least one shading unit located above and at an edge of the first surface without contacting physically the light emitting unit, and the invisible light filter is disposed between the shading unit and the first surface, wherein the shading unit is directly contacted with the invisible light filter.