Patent ID: 9642205
Date: 2017-05-02
CPC Classifications: H05B,Y02B

Claim:
1. A backlight unit comprising: a light source; a static current switching element connected between the light source and a sensing node and controlling a driving current supplied to the light source; a sensing resistor connected between the sensing node and a ground; a static current controller controlling an operation of the static current switching element based on a sensing voltage from the sensing node and an externally supplied driving current control signal; and a driving current corrector generating the driving current control signal and correcting a level of the driving current control signal based on the sensing voltage, wherein the driving current corrector includes: a control signal generator receiving an external input of a reference voltage and generating the driving current control signal; a first corrector comparing a level of the sensing voltage with a level of an upper limit reference voltage, and correcting a level of the driving current control signal output from the control signal generator based on a result of the comparison; and a second corrector comparing the level of the sensing voltage with a level of a lower limit reference voltage, and correcting a level of the driving current control signal output from the control signal generator based on a result of the comparison.