DISPLAY DEVICE, DISPLAY SYSTEM, AND METHOD OF CONTROLLING DISPLAY DEVICE

A display device includes: a first light emitting diode configured to illuminate a first display; a first power control circuit configured to control power supply to the first light emitting diode; a first lighting control circuit configured to execute lighting control of the first light emitting diode; a first monitor circuit configured to monitor a first lighting state of the first light emitting diode; and first control circuitry including a memory and a processor, configured to execute determining, based on an output of the first monitor circuit, whether the first lighting state is abnormal, and controlling permission or non-permission of power supply to a second light-emitting diode of a display device that is used as the second display device, based on a determination result of the determining.