Display circuit, display device, and display system

Abstract

The application discloses a display circuit, a display device and a display system, and belongs to the technical field of display. The display circuit has a first terminal and is pluggably connected with a control box circuit. The control box circuit has a second terminal connected with a reference voltage. A reverse connection prevention circuit is connected with the first terminal and the second terminal. When the first terminal and the second terminal are electrically connected, the reverse connection prevention circuit inputs a detection signal and transmits a power supply direct current provided by a power supply circuit to supply power to the control box circuit. When the first terminal and the second terminal are disconnected, the reverse connection prevention circuit stops transmitting the power supply direct current to make the control box circuit power off and stop working. The detection signal is the reference voltage. The control box circuit is powered on according to the power supply direct current and outputs a serial communication signal. A master control circuit outputs a display signal according to the serial communication signal to make the display circuit display. Thus, the possibility of breakdown of components in the control box circuit is reduced when the control box circuit is reversely connected, and the reliability and safety are improved.