液晶顯示器為目前顯示器市場主要應用，而液晶顯示器為能在大尺寸的需求下保有液晶顯示器原有輕、薄等特性，關鍵在於背光模組的設計。目前背光模組常使用背光源為冷陰極螢光燈管，而冷陰極螢光燈管為線光源需靠光學組件輔助得到面光源，在液晶顯示器發展大尺寸情形下，使背光模組厚度增加。平面螢光燈本身為面光源，可節省光學組件的使用，減少背光模組厚度有利於液晶顯示器在大尺寸的發展。本論文首先探討平面螢光燈發光原理、結構與驅動方法，根據文中所探討平面螢光燈發光特性與驅動方式來設計平面螢光燈驅動電路，且為降低平面螢光燈功率損耗和得到寬的調光範圍，本論文採用數位調光即控制調光訊號責任週期改變平面螢光燈平均電流達到調光的目的。最後本論文研製全橋平面螢光燈驅動調光電路，使平面螢光燈得均勻面光源，且調光範圍可由100%至10%。

Liquid crystal display (LCD) is a main application on flat panel display’s market. In order to let LCD has a large size demand and keep thin characteristic of LCD, the design of backlight modules is a key point. Cold cathode fluorescent lamp (CCFL) is often used to backlights but CCFL needs the optical unit to assist linear luminous source transforming into flat luminous source. In view of the reason giving above, when LCD’s development of large size accompany thickness of backlight modules increasing. Flat fluorescent lamp (FFL) is a flat luminous source that can save the optical unit of backlight modules, let FFL appropriate for development of large size. In this thesis, we present discussions about luminance characteristics and structure of FFL and analyze driving methods to design the driving circuit. In order to reduce power consumption and get wide dimming range, we use digital dimming that control duty cycle of dimming signal to regulate the brightness of FFL. Finally, a full bridge FFL driver with dimming is made, the driver let FFL has a uniform luminance source and dimming range reach range 100% to 10%.

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