目前所有通訊系統，數位相機，數位錄影機，投影機等，設計上皆要求體積小且攜帶方便。最好是一機就可以包含通話功能，拍照功能，錄影功能，播放功能和隨時隨地多人可一起觀賞影片或節目等等之多功能機。在近年以來手機的體積在微小化上持續進步，同樣投影機系統的大小要求越來越小，目標是從小型，可攜帶型到Pico 大小能夠整合在手機或搭配其它的3C 產品使用，在設計時需要多考慮體積大小的整合之外耗電量也很重要，因此設計投影系統時主要元件(Key parts)的選擇也很重要。
本論文的光源系統採用RGB LED 光源搭配準直鏡組，由於LED 光源具有省電與不需要加吵雜的風扇可以高速開關的特性來取代傳統燈泡，反射鏡搭配彩色濾光片產生的機制，在照明系統方面採用透鏡陣列積分器取代積分柱提高光強度均勻目的，這樣的設計可使投影系統的均勻度可達到82% 以上。此外利用新型的TIR 菱鏡結合投影鏡頭與照明系統不但投影系統的體積變小而且提升整個系統的對比度。
在成像光學系統中使用共8 片鏡片(6 片球面和2 片非球面)，總長為52 mm 的遠心鏡頭設計並進行設計後之性能評價與公差分析。由於遠心系統的設計讓鏡頭組設計與照明系統設計可以分開設計、分別優化和性能評價分析後整合為投影機系統，最後使用ASAP光學模擬軟體對系統的光強度效率與均勻度做分析。

At present, all design of communication systems, digital camera, camcorder and projector et cetera were requested with the smallest volume, convenient and carry-on product.
It would be best that a machine including multi function such as communication, photograph,and video, broadcast and share with friends. Since many years the mobile device has made much progress in size. Similarly the size of projector devices is demanded smaller from mini,pocket to Pico size which is significant to integrate into mobile device and other 3C product.
As this requisition, we need to think about not only the size but also the power consumption
of all key parts at first priority when designing the projector device.
In this thesis, for the light source we used the Red, Green and Blue LED with collimator to replace the conventional lamp, reflector and color wheel due to LED light source is the low power consumption, do not need to cool down with fan when the users turn on and off and reduce the size of the light source system. For illumination system we used lens array to take the place of Rod for reduces the total track of illumination system and to get high
uniformity above 82%.
For light separator, we use a new type TIR prism design which combines the projection lens and illumination system to decrease the volume and improve thecontrast of the projector.For the projection system, we used 8 elements such as 6 Spherical lenses and 2 Aspherical lenses to design the telecentric lens with 52 mm of the total track and do the evaluation and analyze the tolerance of the lenses with Code V optical software. Finally we
use the ASAP optical software to simulate the system of the power efficiency and uniformity.

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