VEHICLE LAMP, ILLUMINATION CIRCUIT FOR SAME, CURRENT DRIVER CIRCUIT

A current driver circuit is proposed, structured to drive a plurality of semiconductor light sources, the current driver circuit comprising: a plurality of current sources each structured to allow an on/off state thereof to be controlled independently according to a PWM signal, and to each be coupled to a corresponding semiconductor light source in series; an interface circuit structured to receive, from an external processor at a first time interval T, a plurality of control data that indicates an on/off duty cycle for the plurality of current sources; and a dimming pulse generator structured to generate a plurality of PWM signals for the plurality of current sources, and to gradually change, at a second time interval T that is shorter than the first time interval T, a duty cycle of each of the plurality of PWM signals from a value indicated by the corresponding control data before updating to a value indicated by the corresponding control data after updating, wherein, with T/ T = a, and with the difference in the value between the control data after updating and the control data before updating as ΔX, the dimming pulse generator changes the duty cycle at the second time interval T in a stepwise manner in steps of ΔY = ΔX/a.