FIELD: physics.
SUBSTANCE: LED backlight source includes: an inverter for increasing the DC voltage input and for outputting an increased DC voltage; a number of LED strings connected in parallel, wherein each of the LED strings includes a number of series-connected LEDs and the first resistor, and each of the LED strings receives an increased DC voltage from the inverter; an overcurrent protection circuit for controlling the output power of the inverter according to the detected resistance and a short circuit protection circuit for adjusting the resistance detected by the overcurrent protection circuit according to the voltage across the two terminals of the first resistor.
EFFECT: in the configuration, when one of the LED string resistors is short-circuited, the inverter output power is reduced to prevent burnout of the electronic parts of the former and increase safety and reliability.
12 cl, 5 dwg
