一种直下式LED背光源驱动电路的设计

The Driving Circuit Design of a Direct Illumination-type LED Backlight

传统的背光源采用的是CCFL,色彩还原性差,含有对人体有害的汞蒸汽。LED背光源是一种新型的背光源,色彩还原性好,寿命长;不含汞,有利于环境保护。本文设计的直下式LED背光源,单灯电流可精确控制,光学效果良好,支持PWM调光。中尺寸、大尺寸LED背光源均可借鉴使用。

CCFL is used in the traditional backlight, which has bad color gamut and contains hydrargyrun steam which is harmful to human body. As a new kind of backlight, LED backlight has better color gamut, longer life-span; and is friendly to environmental. It also does not contain hydrargyrun. A direct illumination-type LED backlight is designed in this paper, which has a good optical effect, and can be adjusted by PWM. Each LED can be controlled separately in this design. This paper can also be used for the design of medium-sized and large size LED backlight.