Patent ID: 9232575
Filing Date: 2016-01-05
CPC Classification: G02F,G09G,H05B

Claim Text:
1. A LED backlight driving circuit, comprising: a driving module for receiving a control voltage generated by a voltage control module, receiving a feedback voltage generated by a feedback voltage module, and generating driving signals to a LED unit; a detecting module for generating adjusting signals for an adjusting module according to a detected value of the driving signals; and the adjusting module for controlling the feedback voltage according to the adjusting signals generated by the detecting module so as to adjust the driving signals; wherein one reference driving signals is configured within the detecting module, the adjusting module increases the feedback voltage according to a first adjusting signals when the detecting module determines that a value of the driving signals is smaller than the reference driving signals, and the adjusting module decreases the feedback voltage according to a second adjusting signals when the detecting module determines that the value of the driving signals is larger than the reference driving signals; wherein the detecting module comprises a precise resistor serially connected between the LED unit and ground, and the value of the driving signals of the circuit is obtained by detecting the driving signals of the precise resistor; and wherein the detecting module further comprises a first amplifier and a first comparator, a negative end of the first amplifier connects to a low potential end of the precise resistor via a second resistor, a first resistor is provided between a negative end and the ground, a positive end of the first amplifier connects to a high potential end of the precise resistor via a third resistor, a fourth resistor is provided between the positive end and an output end of the first amplifier, the output end of the first amplifier connects to a negative end of the first comparator, a positive end of the first comparator connects to the reference driving signals, and the output end of the first comparator outputs the adjusting signals.