Patent ID: 8415896

Claim:
A current-type driver of light emitting devices, comprising: a power conversion circuit, for modulating and generating an output voltage according to a feedback signal, so as to sequentially drive a plurality of light emitting devices; a feedback module, coupled to the power conversion circuit, for generating the feedback signal for the power conversion circuit according to the output voltage and an adjusting signal during a first period, wherein none of the light emitting devices is driven during the first period; and a control module, coupled to the feedback module, for outputting the adjusting signal to the feedback module during the first period, wherein the control module controls the power conversion circuit to adjust the output voltage to a pre-drive voltage corresponding to a light emitting device which is to be driven next among the light emitting devices during the first period by using the adjusting signal, wherein the control module further outputs a driving signal to the feedback module according to the light emitting device that is driven, so that the feedback module generates the feedback signal for the power conversion circuit according to currents of the light emitting devices and the driving signal during a second period, wherein one of the light emitting devices is driven during the second period, and the power conversion circuit adjusts the output voltage to a driving voltage corresponding to the driven light emitting device according to the feedback signal, and the light emitting devices are respectively connected to transistor switches in series, and the light emitting devices and the transistor switches are connected between the output voltage and a sensing resistor in parallel, a second end of the sensing resistor is connected to a ground, and an on/off state of each of the transistor switches is controlled by an enabling signal.