Design and implementation of the driving and dimming system for RGB LED backlight module

• Main Authors: Chen-hung Chou, 周禎弘
• Other Authors: Yi-Hua Liu
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/68784767794349506578

碩士 === 國立臺灣科技大學 === 電機工程系 === 96 === In this thesis, a constant current output of boost converter for RGB LED backlight module is presented, and a human machine interface (HMI) for dimming the backlight module is also developed. To successfully drive the RGB LED backlight module, a smart digital controller which takes the forward voltage – forward current relationships of the RGB LED modules into account is first proposed to control the proposed driving circuit. Next, the compensation circuit design for discontinuous conduction mode boost converter is discussed and different current sharing methods are presented and compared. Finally, simulation and experimental results are presented to validate the effectiveness and correctness of the proposed system. According to the experimental results, the presented system can successfully drive the RGB LED backlight module, and the dimming and color-mixing function can be achieved using the developed HMI and driving system.