Patent ID: 8704801

Claim:
A touch display apparatus, comprising: a light guide plate having a first surface, a second surface opposite to the first surface, and a light incident surface connecting the first surface and the second surface; a light emitting module disposed beside the light incident surface and comprising at least one visible light source and at least one invisible light source, wherein the visible light source is capable of emitting a visible light beam, and the invisible light source is capable of emitting an invisible light beam; a display panel disposed at a side of the first surface; a plurality of prism structures disposed between the first surface and the display panel; an image transmission unit, comprising: a wedge portion disposed between the prism structures and the display panel; and a light guide portion, wherein the light incident surface, the first surface, the prism structures, the wedge portion, and the display panel are capable of being passed through in sequence by the visible light beam and the invisible light beam, and a touch object reflects the invisible light beam from the display panel when the touch object approaches the display panel, so that the invisible light beam passes through the display panel, the wedge portion, and the light guide portion in sequence; and an image detector disposed beside the light guide portion and capable of receiving the invisible light beam from the light guide portion.