LED BACKLIGHT DRIVE CIRCUIT, BACKLIGHT MODULE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

An LED backlight drive circuit, a backlight module and a liquid crystal display device. The LED backlight drive circuit comprises an LED light bar, wherein the output end of the LED light bar is connected in series with a control IC and is also connected with a shunt controllable switch (Q3). The shunt controllable switch (Q3) is powered on when the voltage of the output end of the LED light bar exceeds a set value, and is powered off when the voltage is smaller than the set value. The control IC is connected in parallel with the shunt controllable switch (Q3). When the LED light bar is short-circuited, the shunt controllable switch (Q3) is activated, so that some currents will flow to the shunt controllable switch (Q3) so as to reduce the burden of the control IC, thereby reducing the temperature of the control IC.