Patent ID: 9288883
Filing Date: 2016-03-15
CPC Classification: G06F,H05B

Claim Text:
1. A backlight unit, comprising: a power converter which generates a light driving voltage in response to a voltage control signal with a first level; a plurality of light emitting strings, wherein each of the light emitting strings receives the light driving voltage through a first end thereof; and a controller connected to a second end of only one of the light emitting strings and wherein the controller compares a voltage of a signal at the connected second end with a first reference voltage and a second reference voltage, and generates the voltage control signal, wherein the controller comprises a detection circuit that activates a detection signal when the voltage of the signal at the connected second end is higher than the first reference voltage, or lower than the second reference voltage to detect an abnormal state of all of the light emitting strings, wherein the first reference voltage is higher than the second reference voltage, wherein the controller generates the voltage control signal with a second level to stop the power converter from generating the light driving voltage when the detection signal is activated.