Optical touch display device

An optical touch display device, comprising:

• a display panel configured for displaying an image, and the display panel comprising a first substrate, a second substrate and a display layer disposed between the first substrate and the second substrate;
• a transparent substrate disposed on the second substrate, the image being capable of being seen through the transparent substrate, the transparent substrate comprising a touch surface and a plurality of side surfaces adjacent to the touch surface, at least one of the side surfaces being a first light incidence surface, and at least one of the side surfaces being a first light emitting surface opposite to the first light incidence surface;
• at least a light emitting and receiving unit, and each light emitting and receiving unit comprising:
• a linear light source disposed beside the first light incidence surface of the transparent substrate and configured for providing a plurality of optical signals into the transparent substrate through the first light incidence surface;
• and
• a light sensing component disposed beside the first light emitting surface, the light sensing component and the linear light source being respectively disposed at two opposite sides of the transparent substrate, and the light sensing component being configured for receiving the optical signals emitted from the first light emitting surface.