Liquid crystal display capable of detecting short in LED in liquid crystal panel and driving method thereof

摘要

A liquid crystal display comprises: a liquid crystal panel; LED strings connected to an output terminal of a DC power source and providing light to the liquid crystal panel; transistors whose collector electrodes are connected to cathodes of LEDs positioned at the lowermost stages of the LED strings, and whose emitter electrodes are connected to monitor resistors; and an LED driver which has first pins respectively connected to base electrodes of the transistors to supply driving signals and second pins connected between the emitter electrodes of the transistors and monitor resistors, wherein the first pins sense voltages of the base electrodes of the transistors to detect a short in an LED, wherein the LED driver comprises driving signal supply portions for supplying the driving signal and short sensing portions for detecting the presence or absence of a short in the LED.

主权项

1. A liquid crystal display comprising:
a liquid crystal panel; LED strings connected to an output terminal of a DC power source and providing light to the liquid crystal panel; transistors whose collector electrodes are connected to cathodes of LEDs positioned at the lowermost stages of the LED strings, and whose emitter electrodes are connected to the monitor resistors; and an LED driver which has first pins respectively connected to base electrodes of the transistors to supply driving signals and second pins connected between the emitter electrodes of the transistors and monitor resistors, wherein the first pins sense voltages of the base electrodes of the transistors to detect a short in the LEDs, wherein the LED driver comprises driving signal supply portions for supplying the driving signal and short sensing portions for detecting the presence or absence of a short in the LEDs, and wherein the short sensing portions receive a sensing voltage from the base electrodes of the transistors, respectively, through sensing resistors respectively formed between output terminals of the driving signal supply portions and the base electrodes of the transistors, and detect the presence or absence of a short in the LEDs included in the corresponding LED string based on the sensing voltage.