Electronic device with infrared touch input function

A method of controlling an electronic device with infrared touch input function, comprising:

• supplying a display unit defining an signal display area;
• supplying an infrared input device comprising a circuit board having two pairs of oppositely disposed sides defining an open area corresponding in size and shape to the signal display area,
• supplying at least one light emitting device positioned on the circuit board, configured for emitting infrared light;
• supplying at least one light detecting device positioned on the circuit board, configured for detecting infrared light emitted by the at least one light emitting device;
• wherein the at least one light emitting device is positioned on two adjacent sides of the circuit board, and the at least one light detecting device is positioned on one corner of the circuit board facing the light emitting devices, or
• the at least one light detecting device is positioned on two adjacent sides of the circuit board, and the at least one light emitting device is positioned on one corner of the circuit board facing the light detecting devices;
• controlling the at least one light emitting device to emit infrared light, detecting infrared light paths obstructed via the light detecting devices;
• sending information of obstructed infrared light paths to a CPU if any infrared light path is obstructed;
• the CPU obtaining the information of the obstructed infrared light path including which infrared light paths are obstructed, order and/or number of the obstructed infrared light paths, if there are two or more infrared light paths are detected obstructed in a predetermined time from the first time one infrared light path is detected obstructed;
• the CPU performing corresponding functions according to the information of the obstructed infrared light path.