Display screen having mirror function, control method, device and terminal

A control device for a display screen having a mirror function, comprising:

• a display screen having a mirror function, a first trigger, a second trigger and a controller, wherein
• the display screen comprises a screen lens, a liquid crystal display, a nano suspension layer, and a magnetic layer provided on a back surface of the liquid crystal display;
• the nano suspension layer is disposed between the screen lens and the liquid crystal display;
• the nano suspension layer comprises an upper plate, a nanomaterial layer and a grounding plate;
• the upper plate is disposed between the screen lens and the nanomaterial layer and the grounding plate is disposed between the liquid crystal display and the nanomaterial layer;
• the first trigger is arranged to send a trigger-on signal to the controller when a first predetermined condition is satisfied;
• the second trigger is arranged to send a trigger-off signal to the controller when a second predetermined condition is satisfied;
• and
• the controller is arranged to control the magnetic layer to provide a static magnetic field perpendicular to the display screen upon receipt of the trigger-off signal;
• and to control the upper plate to provide a voltage, or control the upper plate to provide a voltage and control the magnetic layer to provide a static magnetic field perpendicular to the display screen upon receipt of the trigger-on signal.