Patent ID: 9053670
Filing Date: 2015-06-09
Classification: G09G,H05B

Abstract:
1. An LED backlight module, used for a liquid crystal display apparatus, comprising: a boosting circuit for receiving a direct current voltage, boosting the direct current voltage, and then outputting a step-up direct current voltage; an LED string, including a sixth resistor and a plurality of LEDs connected in series, for receiving the step-up direct current voltage from the boosting circuit; a constant current driver circuit for generating a signal used for controlling the boosting circuit; a amplifying circuit for receiving the direct current voltage, amplifying the signal from the constant current driver circuit, and then outputting a magnified signal to the boosting circuit; wherein the amplifying circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a first transistor, and a second transistor; wherein a first end of the first resistor connects to a first end of the third resistor and receives the direct current voltage; wherein a second end of the first resistor connects to the boosting circuit; wherein a second end of the third resistor connects to a collector of the first transistor; wherein a base of the first transistor connects to one end of the fifth resistor and the constant current driver circuit; wherein the other end of the fifth resistor connects to an emitter of the first transistor and electrically grounds; wherein a base of the second transistor connects to one end of the fourth resistor and the collector of the first transistor; wherein a collector of the second transistor connects to one end of the second resistor and the second end of the first resistor; wherein an emitter of the second transistor connects to the other end of the second resistor and the other end of the fourth resistor; and wherein the other end of the fourth resistor electrically grounds.