Infrared touch circuit and touch blackboard

According to the infrared touch control circuit and the touch control blackboard, a first auxiliary screen outputs an enable signal, and a first switching circuit and a second switching circuit in a main screen respectively forward a first driving data frame and a first identification data frame to the first auxiliary screen according to the enable signal; a first transmitting circuit of the first auxiliary screen extracts first auxiliary screen display data in the first driving data frame so as to enable a plurality of LEDs to emit light rays, and outputs a second driving data frame; a first receiving circuit of the first auxiliary screen extracts first auxiliary screen identification data in the identification data frame, outputs a plurality of first induction signals according to the received light rays, and outputs a second identification data frame; a second transmitting circuit of the main screen extracts main screen display data in a second driving data frame, so that a plurality of LEDs emit light ray