Touch-sensitive system with optical transmitters and receivers

The general field of the invention is that of optical touch-sensitive systems mounted above areas of display surfaces. The system comprises at least two light sources arranged to produce above a display surface a luminous layer covering said surface, a first imager and a second imager the optical fields of which cover the surface. The sources are separate from the imagers. When a first object is situated above the surface, first and second luminous images of said object are captured by the first imager and the second imager, the system including analysis means enabling by triangulation of the known positions of the first and second luminous images, determination of the position of this first object above the display surface. In more elaborate configurations, the system comprises a plurality of sources of illumination and imagers enabling coverage of complex surfaces, enabling multi-touch detection or securing the detection functions.