本論文旨在研製液晶顯示器中以紅、綠、藍光發光二極體為背光源之混光驅動電路，相較冷陰極螢光燈管作為背光源，畫面更達到高色彩、高飽和度。文中以八顆LED為一串列，並且取一顆LED作為LED串列混光感測之用。首先分析LED光強度對色彩感測電路之關係，並且使用積分球量測系統測量RGB LED混光電流作為單晶片混光控制之依據。接著設計一閉迴路降壓電路，提供LED所需之穩定輸出電壓，經由穩流控制電路，可穩定控制LED順向電流。根據先前的量測分析，在LED特定混光電流比下之光強度，色彩感測電路轉換感測電壓送入單晶片控制電路，控制LED各個順向混光電流。經實測驗證，感測混光確實能將LED順向電流控制在混光電流下。

The purpose of this thesis is to develop red, green and blue light emitting diode (LED) mixed light driving circuit for the backlight in the liquid crystal display (LCD). Comparing with the cold cathode fluorescent lamp (CCFL) for backlight, LED can make the image more colorful and saturate. The thesis lets eight LED be a string and uses a LED to sense and mix for LED string. First, analyzes the influence of LED brightness intensity versus color sensor circuit and using integrating sphere measurement system to measure the mixing white light of RGB LED forward current in accordance with single chip control circuit. Then, a closed loop buck converter is designed to provide a stable voltage for LED. Besides, stable current circuit can control the forward current of LED. According to the analysis and measurement result, the brightness intensity of LEDs under a specific current ratio would be transfer to the voltage signal by the color sensor circuit. The voltage signal would be send to the single chip control circuit to control the forward current of every LED. Experimental results show that the sensing and mixing can control the forward current of LED under the mixing current.

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