Patent ID: 8493365

Claim:
An optical touch display apparatus, comprising: at least one visible light emitting device, capable of emitting a visible beam; a light distribution adjustment device, disposed beside the visible light emitting device in a transmission path of the visible beam; a non-visible light guide module, comprising: a light guide unit, disposed on the light distribution adjustment device in the transmission path of the visible beam from the light distribution adjustment device, and having a first surface facing away from the light distribution adjustment device, a second surface facing the light distribution adjustment device, and a side surface connecting the first surface and the second surface; and a dichroic unit, disposed on the light distribution adjustment device and between the light guide unit and the light distribution adjustment device; at least one non-visible light emitting device, disposed beside the side surface, and capable of emitting a non-visible beam, wherein the non-visible beam is capable of entering the light guide unit through the side surface, and the dichroic unit is capable of letting the visible beam pass through and reflecting the non-visible beam from the side surface to the first surface; a display panel, disposed on the light guide unit, wherein a sensing space is located in front of the display panel, the display panel is disposed between the light guide unit and the sensing space, the light guide unit is disposed between the display panel and the dichroic unit, and the non-visible beam is capable of being transmitted to the sensing space through the first surface; and at least an optical detector, disposed outside the display panel, wherein a touch object reflects a portion of the non-visible beam when the touch object enters the sensing space, and the optical detector is disposed in a transmission path of the portion of the non-visible beam reflected by the touch object.