近年來影像重現平台快速發展，如液晶顯示器、液晶電視、液晶式投影機及DLP投影機等皆推陳出新，許多顯示器標榜廣色域為其主要特點，目前有許多多原色顯示器的文獻陸續發表，但是仍有許多問題尚未解決。本研究將提出一個新的多原色投影系統架構，使用兩台投影機，針對其中一台投影機光源更改其內部的雙色分光鏡，改變其三原色，與另外一台保持不變的投影機結合為一個新的六原色顯示器。對於雙色分光鏡的光譜選擇，本研究以等亮度色域邊界原理建立色域立體，評估色域立體的體積與亮度的優值函數，找出最佳的截止波長。過去在兩台投影機畫面對準上是使用梯形校正來對準，而本論文利用投影機的偏移量來對準投影畫面，取代過去使用梯型修正來對準畫面，畫面像素不會失真。過去的六原色顯示器因為增加濾光片來分色光卻產生亮度與對比度降低。本研究直接更改雙色分光鏡，不會降低亮度與對比度。除此之外，本研究使用反射鏡來轉折投影機光路，亦建立一個機構平台，使得調整投影畫面更精確。Recently, color reproduction stages are developed greatly, such as liquid-crystal displays, LCD TV, LCD projectors, DLP projectors, and etc. Wide-color-gamut displays are distinguishing feature of many display manufacturers. Many researches about multi-primary color displays are proposed, but there are still some problems which are not solved. This study proposed a novel multi-primary projection display system using two projectors. One of the two projectors is modified by changing two dichroic mirrors inside. The modified projector is combined with the other to a new six-primary color display. This study applies equal-luminance boundary theorem to construct gamut volume and evaluates the merit between gamut volume and brightness. By this method, the cut-off wavelength of dichroic mires can be found out. In the past, to align the images of the two projectors is pre-distored to compensate the trapezoidal distortion. This study proposes to eliminate trapezoidal distortion by using the offset of the projector. This study directly changes dichroic mirrors to maintain the brightness and contrast, and solves lower brightness and contrast resulted from adding filters before. Additionally, this study uses a reflection mirror to twist projection path and also constructs a stage to align projection images more accurately.