LED backlight system and display device

An LED backlight system, which comprises:

• a power source module, for supplying power;
• an LED array, electrically connected to the power source, comprising a plurality of LED strings with common anode, the LED backlight system further comprising:
• a master switch module, comprising a plurality of first switch transistors, each of the plurality of first switch transistors being serially connected respectively to corresponding LED string for receiving switch control PWM signal of LED string to control the on-and-off of each LED string;
• a current detection module, serially connected to current loop of LED string, for outputting a plurality of current feedback signals of LED strings;
• a current equalizer module, connected to current detection module, the current equalizer module comprising equalizer control unit and equalizer switch unit connected to the equalizer control unit;
• wherein equalizer control unit, based on current feedback signal to control on-and-off of equalizer switch unit to control impedance of current loop of each LED string so as to control illumination of each LED string;
• and
• a current shunt module, connected in parallel with current equalizer module, for performing current shunt on current equalizer module.

A display device, which comprises:

• a display panel and a backlight system;
• wherein the backlight system further comprises:
• a power source module, for supplying power;
• an LED array, electrically connected to the power source, comprising a plurality of LED strings with common anode, the LED backlight system further comprising:
• a master switch module, comprising a plurality of first switch transistors, each of the plurality of first switch transistors being serially connected respectively to corresponding LED string for receiving switch control PWM signal of LED string to control the on-and-off of each LED string;
• a current detection module, serially connected to current loop of LED string, for outputting a plurality of current feedback signals of LED strings;
• a current equalizer module, connected to current detection module, the current equalizer module comprising equalizer control unit and equalizer switch unit connected to the equalizer control unit;
• wherein equalizer control unit, based on current feedback signal to control on-and-off of equalizer switch unit to control impedance of current loop of each LED string so as to control illumination of each LED string;
• and
• a current shunt module, connected in parallel with current equalizer module, for performing current shunt on current equalizer module.