Concentrated on-off control circuit of subway vehicle display screens

Disclosed is a concentrated on-off control circuit of subway display screens. A master circuit breaker, a self-locking button, a cab-activating relay normally-open contact, and a display screen switch-off relay are serially connected so that a display screen control master circuit is formed. A display screen control contactor of each carriage is connected with the master circuit breaker after being serially connected with a normally-closed contact of the display screen switch-off relay so that a display screen control sub circuit of each carriage is formed. The display screen control contactor of each carriage is provided with two pairs of normally-open contacts, which are respectively serially connected between a left circuit breaker and a left-side display screen and between a right circuit breaker and a right-side display screen. Through pressing the self-locking button in an activated cab, concentrated closing and starting of liquid-crystal displays of the whole train can be realized. The control circuit is ingenious in design, safe and reliable in control, convenient to operate and capable of bringing convenience to maintenance and testing work.