Light emitting device

A semiconductor device comprising:

• an operational amplifier;
• a resistor;
• a buffer;
• and
• a bipolar transistor,
• wherein a first input terminal of the operational amplifier is electrically connected to one terminal of the resistor,
• wherein an output terminal of the operational amplifier is electrically connected to a base terminal of the bipolar transistor,
• wherein an emitter terminal of the bipolar transistor is electrically connected to the other terminal of the resistor and a terminal of the buffer to which a low power potential is configured to be supplied, and
• wherein a second input terminal of the operational amplifier is electrically connected to a terminal of the buffer to which a high power potential is configured to be supplied.

A semiconductor device comprising:

• an operational amplifier;
• a resistor;
• a buffer;
• and
• a light emitting element,
• wherein a first input terminal of the operational amplifier is electrically connected to one terminal of the resistor,
• wherein an output terminal of the operational amplifier is electrically connected to the other terminal of the resistor and a terminal of the buffer to which a low power potential is configured to be supplied, and
• wherein a second input terminal of the operational amplifier is electrically connected to an anode of the light emitting element and a terminal of the buffer to which a high power potential is configured to be supplied.

A semiconductor device comprising:

• an operational amplifier;
• a resistor;
• a buffer;
• a bipolar transistor;
• and
• a light emitting element,
• wherein a first input terminal of the operational amplifier is electrically connected to one terminal of the resistor,
• wherein an output terminal of the operational amplifier is electrically connected to a base terminal of the bipolar transistor,
• wherein an emitter terminal of the bipolar transistor is electrically connected to the other terminal of the resistor and a terminal of the buffer to which a low power potential is configured to be supplied, and
• wherein a second input terminal of the operational amplifier is electrically connected to an anode of the light emitting element and a terminal of the buffer to which a high power potential is configured to be supplied.