为了提高无汞平面光源(FFL)的发光效率和避免放电收缩,设计并制作了一种新型的具有弧形电极结构的无汞平面光源,该结构光源在单极性脉冲作用下具有高亮度、高发光效率以及高工作余度等特性;另外,设计了一种可实现区域调光的电极结构,基于该结构光源,提出了一种调光方法及调光电路;最后,完成了基于81 cm(32 in)无汞平面光源的模型验证.实验结果表明:所设计的平面光源可采用脉冲密度调制或者脉冲频率调制的调光方法来实现亮度的行列可调,在最大亮度时,其功耗为256 W;而当其亮度降低至400cd/m2时,其功耗降低至15 W,此时FFL有最高发光效率为29 lm/W.采用区域调光方法可以在获得100%~6%宽范围亮度调节的同时,有效降低FFL背光源的功耗.
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