Patent ID: 8913036

Claim:
A touchscreen, comprising: a first substrate; a second substrate opposite to the first substrate, comprising: a first surface close and opposite to the first substrate; and a second surface opposite to the first surface; and a plurality of photosensors disposed on a surface of the first substrate close and opposite to the first surface of the second substrate; wherein the first surface and the second surface have different optical properties, the first surface serves as an incident surface to receive a first light completely penetrating through the second substrate to emit from the second surface; when the second surface receives a second light, a portion of the second light at a specific wavelength penetrates through the second substrate and is emitted from the first surface while the other portion of the second light at other wavelengths are totally reflected by the second surface, the plurality of photosensors detect the second light at the specific wavelength penetrating through the second substrate, and output corresponding detecting signals.