| 摘要 |
<p>Disclosed are an LED backlight driving method, an LED backlight driving circuit, and a liquid crystal display device. The LED backlight driving method comprises the following steps: detecting the voltage and current of each LED string, calculating the power of each LED string, determining a reference power; and adjusting for each LED string the output power thereof until same equals the reference power. The constant power control scheme employed in the present invention, on the one hand, supplements a reduction in brightness of the LED due to heating, while on the other hand, by adjusting automatically the voltage and current of a light guide plate, thus allowing for reduced current for high crossover voltage, and for increased voltage for low crossover voltage, reduces the wearing and temperature of a constant current control circuit due to different crossover voltages.</p> |
