Light-emitting device

A light-emitting device comprising:

• a light-emitting circuit provided between a power supply node and a ground node, the light-emitting circuit including a light source element;
• a power supply connected to the power supply node and configured to supply electric charges to the light-emitting circuit;
• and
• a monitor configured to monitor an electrical condition of the light-emitting circuit,
• the power supply being connected to the power supply node via a power supply line located outside the light-emitting circuit,
• the light-emitting circuit including:
• a switch configured to switch between a conductive state and a non-conductive state in accordance with a signal supplied from a signal generator;
• and
• a charge and discharge circuit configured to store electric charges,
• the light source element and the switch being connected in series between the power supply node and the ground node, and the charge and discharge circuit being connected to be in parallel with the light source element and the switch, between the power supply node and the ground node,
• the monitor being configured to detect an abnormal state of a current flowing through the charge and discharge circuit.