本論文提出一以數位控制LLC諧振轉換器為基礎之紅綠藍發光二極體背光模組驅動系統。LLC諧振轉換器具有零電壓切換特性，可降低開關元件之切換損失，提高轉換器整體效率。所提出之驅動系統實現了場色序法顯示技術及區域調光控制，並具有動態電壓調整功能。本論文使用單組電源轉換器驅動紅綠藍發光二極體面板，因此驅動系統架構簡單，可降低成本。本系統將紅綠藍發光二極體面板分成四塊區域，可搭配人機介面進行各區之亮度控制。透過數位控制，轉換器可達成變動輸出電壓功能使得串聯在紅綠藍發光二極體上之線性穩流電路消耗功率降低，因此系統效率可進一步提高。所提出之驅動系統具有架構簡單、電源效率佳，畫面對比度高及色域廣等優點。實驗結果顯示，本文提出之系統架構可成功驅動紅綠藍發光二極體背光面板，並透過人機介面完成混色與區域調光控制。

In this dissertation, a digitally-controlled LLC resonant converter for RGB LED backlight driving system is proposed. The LLC resonant topology allows for zero voltage switching (ZVS) of the main switches thereby dramatically lowering switching losses and boosting efficiency. Field color sequential techniques, local dimming control and dynamic bus voltage regulation technologies are then implemented in the proposed system. Using the topology proposed in this dissertation, only one power converter is required to drive the red, green and blue LED strings; therefore the system configuration is very simple. By dividing the backlight into four areas, the backlight brightness of each area can be individually controlled. The output voltage is adjusted by the proposed digital controller so that RGB LED maintains the desired string current. Because the voltage across the linear current regulators in the system is the minimum voltage, the driving system efficiency is maximized. The proposed backlight driving system boasts the advantages of simple circuit structure, improved power efficiency, high contrast ratio and wide color gamut. Finally, 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 color-mixing, local dimming and bus voltage regulation functions can be achieved.

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