Interactive display

An interactive display device comprising:

• an image layer configured to provide a user with a perceivable visible image according to an electronic signal;
• a touching surface covering the image layer or formed by the image layer;
• an image capture unit configured to obtain, in a particular invisible frequency range and at a given image set capture rate, successive sets of captured images representative objects in the proximity of the image layer;
• a processor configured to detect from the captured images contact areas where a pointing object contacts the touching surface and thus causes correspondingly a set of marks in the captured images;
• an illumination unit configured to illuminate in the invisible frequency range the contact areas with blinking illumination at a strobe rate that is less or equal to the image set capture rate;
• the processor being further configured to detect the contact areas by identifying matching sets of marks from captured images of an image set based on:
• differences in luminosity of the marks of matching sets of marks of successive captured images;
• and
• information regarding the blinking illumination.