Patent ID: 8643289

Claim:
A Light Emitting Diode (LED) driver circuit, comprising: a voltage detector connected to a plurality of LED arrays, the voltage detector being configured to: receive a feedback voltage from each of the LED arrays; determine a connection status of each of the LED arrays according to a corresponding level of the feedback voltage; and detect a minimum feedback voltage from feedback voltages of the LED arrays that are determined to be connected; a controller configured to output a control signal to one of abort and control boosting of the LED arrays according to the detected minimum feedback voltage; a Pulse Width Modulation (PWM) signal generator configured to output a PWM signal corresponding to the outputted control signal according to an on/off state of a dimming signal that drives the LED arrays that are determined to be connected; and a driving voltage generator configured to commonly apply a driving voltage to the LED arrays according to the outputted PWM signal.