有鑑於現有LED投影機只使用Red、Green和Blue三種光譜LED且輸出流明值不高的缺點，因此，在這篇論文裡我們為了增加色域(Color Gamut)範圍已提升畫面色彩鮮豔度並提高輸出流明值，我們增加一種青綠色光譜的LED。然而，現今討論相關LED投影機的照明架構的論文中，不外乎是將三色RGB藉由導光柱做均勻效果最後再加上X稜鏡(X-cube)做三色疊加的混光效果，但此架構仍嫌太大，並散熱系統設計較為麻煩。因此我們設計在長寬比小於1的導光管中，內部增加多片反射片，進而建構完整的照明系統，此系統不但擁有良好的均勻度並且色彩表現更為豐富，再者，整體照明架構體積只有95立方公分，大幅縮小了LED投影架構的體積且散熱系統的設計也較為簡單。最後，我們採用Lumileds所生產的LED當作光源並構想出新型的照明系統架構，依照幾何光學的理論分析去計算導光管內部反射光學元件的規格與擺放位置，再利用TracePro（光機構模擬軟體）來驗證結果並加以分析！

In view of the fact that LED projectors use only three primary RGB colors, while suffered from the shortcoming of low output flux and troublesome cooling system design. We therefore, in this paper add another cyan color spectrum LED to make picture more colorful and brighter in order to extend color gamut and increase output flux as well. Besides, nowadays many researches discussing LED illumination projection system are focused on no more than mixing three colors, to have uniform effect with light guide. An optical component X-cube is then used to get mixing effect by stacking three colors. But these constructures are still too big and the cooling system can be very complicated. Therefore, we design an innovative illumination system in this paper, it is not only achieving same effect and is even richer in color. The total volume is only 95 and the cooling system becomes simpler. We used Lumileds series LED to design the illumination system. We calculated the positions and specification of the interior reflective parts in the light guide, according to the geometrical optics. Finally, we confirmed results using TracePro software and performed to analyze.

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