| 摘要 |
<p>A backlight assembly has a lamp driving device for driving external electrode fluorescent lamps (EEFLs) (110) parallel connected each other. The lamp driving device includes a power switch transistor (Q1), a diode (D1), an inverter (120) and a PWM controller (140). The transistor (Q1) converts external DC power signal (Vin) into pulse power signal based on switching signal, the diode (D1) prevents rush current from flowing into the transistor (Q1). The inverter (120) converts the pulse power signal into AC power signal, raises voltage level of the AC power signal, and provides the lamps (110) with the raised AC power signal. The PWM controller (140) is activated by external on/off signal to provide the transistor (Q1) with the switching signal so as to regulate voltage level of the AC power signal. The EEFLs (110) can maintain a constant current level, and the backlight assembly can have characteristics of uniform luminance, high luminance and high heat efficiency.</p> |
