Compact infrared touch screen apparatus

An infrared touch screen apparatus, comprising:

• a display screen mounted within a frame;
• a circuit board disposed behind a back side of said display screen;
• an array of infrared transmitting devices mounted on said circuit board and a corresponding array of infrared receiving devices mounted on said circuit board;
• an array of first periscope devices in optical communication with said infrared transmitting devices, said first periscope devices each configured to redirect an infrared beam originating from one of said infrared transmitting devices behind said display screen, over a front side of said display screen;
• and
• an array of second periscope devices in optical communication with said first periscope devices, said second periscope devices each configured to redirect said infrared beam from said front side of said display screen to said infrared detecting devices behind said display screen, thereby resulting in a grid of infrared light projected over said front side of said display screen.