Patent ID: 8872802

Claim:
A method of adjusting a rotary angle of an optical touch module, the optical touch module comprising a sensor and a panel, the method capable of rotary adjusting the sensor which moves relative to the panel from a first position to a second position, the method comprising: measuring a length and a width of the panel; measuring a first moving distance and a second moving distance of the sensor when the sensor moves from the first position to the second position, wherein the first moving distance is along a first direction and the second moving distance is along a second direction different from the first direction; calculating a first projecting distance and a second projecting distance of the sensor according to the length and width of the panel when the sensor is at the first position, wherein the projecting distances is respectively between the first position and adjacent corners of the panel; calculating a first angle and a second angle of the sensor according to the first moving distance, the second moving distance, the first projecting distance and the second projecting distance when the sensor is at the second position, wherein the angles are respectively between the second position and the adjacent corners of the panel; and calculating the horizontal rotary angle of the sensor when the sensor moves from the first position to the second position according to the first angle and the second angle.