Optical touch-control system

An optical touch-control system comprising:

• a light-guide unit including four light-guide modules that cooperate to define a touch-control zone and four corners, each of said light-guide modules including a light-guide strip having opposite first and second ends, a light-entry surface that is disposed at said first end, and a light-exit surface that extends between said first and second ends and that is oriented toward the touch-control zone, wherein for each of two of said light-guide modules that define a first one of the corners, said light-entry surface of said light-guide strip of said light-guide module is oriented toward the first one of the corners, and wherein for each of remaining two of said light-guide modules that define a second one of the corners diagonally opposite to the first one of the corners, said light-entry surface of said light-guide strip of said light-guide module is oriented toward the second one of the corners;
• a light-emitting unit including four light-emitting modules, two of which are disposed in the first one of the corners, and remaining two of which are disposed in the second one of the corners, each of said light-emitting modules being oriented toward said light-entry surface of said light-guide strip of a corresponding one of said light-guide modules disposed in the same one of the corners, light that enters each of said light-guide modules via said light-entry surface thereof exiting from said light-guide module via said light-exit surface thereof;
• and
• a sensor unit including first, second, and third image acquisition modules disposed respectively in the first and second ones of the corners and a remaining one of the corners, each of said first, second, and third image acquisition modules being oriented toward the touch-control zone.