Patent ID: 8569965

Claim:
A driving circuit of a light emitting element comprising: a switching power source configured to supply a driving voltage to a first terminal of the light emitting element to be driven; and a current driver connected to a second terminal of the light emitting element, the current driver configured to supply a driving current to the light emitting element while a burst dimming pulse is being asserted, wherein the switching power source comprises: a capacitor in which a potential of one end is fixed; an error amplifier configured to supply a current depending on a difference between a detection voltage generated from the second terminal of the light emitting element and a reference voltage to the capacitor; a switch installed between an output terminal of the error amplifier and the capacitor and maintained in an ON state while the burst dimming pulse is being asserted; a pulse generation unit configured to receive a feedback voltage generated in the capacitor and generate a switching pulse signal having a corresponding duty ratio; a driver configured to drive a switching element of the switching power source based on the switching pulse signal; and a feedback voltage regulator circuit configured to be switched between ON and OFF states based on a pulse width of the burst dimming pulse and supply a current to the capacitor when in an ON state.