Patent ID: 8730211

Claim:
An optical touch circuit comprising: an optical sensing unit for being turned on or turned off according to an irradiation light intensity and accordingly generating a first signal; a first signal readout unit, electrically coupled to the optical sensing unit, wherein the first signal readout unit is turned on or turned off according to a first operation timing sequence and accordingly outputs the first signal; a touch reference unit, disposed at a side of the optical sensing unit and for providing a reference voltage; a second signal readout unit, electrically coupled to the touch reference unit, wherein the second signal readout unit is turned on or turned off according to a second operation timing sequence and accordingly outputs the reference voltage; and a touch sensing unit, electrically coupled to the first signal readout unit and the second signal readout unit, wherein the touch sensing unit is configured for using a voltage difference between the first signal and the reference voltage as a basis to determine that whether the optical touch circuit is touched or not.