隨著產業的快速變動，近年來筆記型電腦與可攜式資訊產品不斷地推陳出新，使得液晶顯示器的需求量持續上升，同時也帶動了背光源的需求。本文提出一個以FPGA(Field Programmable Gate Array)為基礎的液晶顯示器背光系統開發，採用全橋式諧振換流器架構來驅動冷陰極燈管，並以FPGA作為系統控制核心，取代市售的CCFL(Cold Cathode Fluorescent Lamp)驅動晶片。在脈波寬度調變控制方面，採用零電壓切換，可減少開關導通所造成的損失。在調光控制方面，採用低頻脈衝調光來達到亮度明暗的控制，並利用另一種脈衝密度調變之調光方式，改善低頻脈衝調光控制在調光操作期間燈管會重覆點滅的缺點，以延長燈管的使用期限。最後，以數位的方式實現比例積分(PI)控制器，完成背光系統的全數位控制。

The proliferation of laptop and notebook computers places an ever-increasing demand on display technology, since high resolution and contrast are required to run today's graphics based programs. Nowadays, most of current LCD displays use CCFL backlighting because it satisfies the requirements on display performance, size, and efficiency.
In this thesis, an FPGA-based driving system for LCD backlight is presented. The proposed system consists of a switch-mode full-bridge inverter power stage operating in zero-voltage-switching (ZVS) condition to increase the conversion efficiency and an FPGA-based digital controller. In this thesis, low frequency dimming control and Pulse Density Modulation (PDM) dimming control are both proposed to regulate the brightness of lamps. The method of Pulse Density Modulation dimming control can mitigate the drawback of re-spiking problem of low frequency dimming control. At last, the full-digital control of a backlight system is accomplished by implementing the PI controller in digital way.

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