Patent ID: 8525422

Claim:
A backlight apparatus comprising: a plurality of light emitting diode modules, each of the light emitting diode modules comprising: a first connection pin set and a second connection pin set, each of the connection pin sets comprising a first power connection pin, a second power connection pin, a first ground connection pin, and a second ground connection pin, the first power connection pin being coupled to the second power connection pin, the first ground connection pin being coupled to the second ground connection pin, wherein the first ground connection pin of the first connection pin set is coupled to the first power connection pin of the second connection pin set; a driving circuit coupled to the first power connection pin of the first connection pin set and the first ground connection pin of the second connection pin set for providing a driving signal; and a first light emitting diode string and a second light emitting diode string, each of the light emitting diode strings being serially connected between the second power connection pin and the second ground connection pin of each of the connection pin sets and receiving the driving signal, wherein the driving circuit is a direct current to direct current power converter, and the direct current to direct current power converter comprises: an inductor, an end of the inductor receiving an input voltage; a semiconductor pseudo switch serially connected between the other end of the inductor and a base voltage, the semiconductor pseudo switch being controlled by a pulse width modulation signal; a first diode, an anode of the first diode being commonly coupled to the inductor and the semiconductor pseudo switch, a cathode of the first diode generating the driving signal; a voltage detecting circuit receiving the driving signal and generating an over voltage protecting signal by dividing a voltage of the driving signal; and a controller receiving an operating voltage, a feedback signal, the over voltage protecting signal, an enabling signal, and a dimming signal, wherein the controller generates the pulse width modulation signal based on the feedback signal and the dimming signal when the enabling signal is enabled.