本篇論文主要提出以黃色發光二極體(LED)加入紅色、藍色、綠色LED為混光照明光源，相較於只有紅、藍、綠三原色的光源，亮度更高、更不失演色性(CRI)。但因黃色發光二極體有實際取得上的困難而以具有黃色光譜低色溫3000K的白色發光二極體取代之。本文以紅、藍、綠、白色四顆LED和積分球光譜量測加上微控制器(MCU)，作為光源混光及控制迴路，來探討LED順向電流與亮度及演色性之間的關係。先分析積分球對各顏色LED光譜之關係，利用其光譜量測紅、藍、綠、白色 LED光源混光後的演色性作為微控制器調光控制的資料庫。最後，將RGBW LED調整至類似白熾燈的光譜，以達到高演色性。根據以上之量測分析，設計一閉迴路控制電路，利用調變脈波(PWM)控制原理，獨立控制通過各顏色LED電流強度，光源經由積分球回送亮度值到微控制器，再經由微控制器內部韌體運算，調整脈波輸出去控制各個LED之電流。經實測驗證，RGBW LED混光確實比RGB LED達到更高亮度且較佳之演色性。

In this thesis, the color mixture illumination of yellow (Y) Light Emitting Diode (LED) is introduced to improve the luminance and the color rendering index (CRI) of red (R), green (G), and blue (B) ones. The work adopts 3000K white LED which provides yellow spectral to replace the yellow LED since it is not easy acquired. To investigate the relation among luminance, CRI, and LED forward current, we adopt R, G, B, W LEDs, integrating sphere, and Micro-Controller Unit (MCU) to implement the illumination source and control circuitry. We analyze the relation of spectral between each LED in the integrating sphere, and collect the CRI of their spectral of R, G, B, and W LED color mixture illumination as the database in the MCU. Finally, the spectral of RGBW LED is adjusted to be similar to the incandescent one. According to the above measurement and analysis, a closed loop control circuitry is designed by utilizing the principle of Pulse-Width Modulation (PWM) to control each LED forward current independently. The MCU reads the luminance and spectral through integrating sphere and adjusts the PWM output to control each LED forward current. Experimental results show that the proposed RGBW LEDs get better luminance and color rendering than RGB LEDs.

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