Optical touch system

An optical touch control system, comprising:

• a display panel;
• a first optical sensor, disposed at a first corner of the display panel;
• a first light-emitting device, disposed on the first optical sensor, and configured to emit a first light beam toward a first direction;
• a second optical sensor, disposed at a second corner of the display panel, wherein the second corner is opposite the first corner;
• a second light-emitting device, disposed on the second optical sensor, and configured to emit a second light beam toward a second direction;
• and
• a controller, configured to turn off the first and second light-emitting devices and turn on the first optical sensor to obtain a first frame, only turn on the second light-emitting device and turn on the first optical sensor to obtain a second frame, turn off the first and second light-emitting devices and turn on the second optical sensor to obtain a third frame, only turn on the first light-emitting device and turn on the second optical sensor to obtain a fourth frame, and determine a gesture according to the first, the second, the third, and the fourth frames.