體積3D顯示器(Volumetric 3D display, V3D)是一種能在裝置顯示空間中、產生佔有真實體積的立體影像，此影像具備包含動態視差在內的所有生理視深感、可由複數觀察者由幾近任何角度以裸眼觀賞影像，應用領域觸及工業設計、建築、3D動畫模型設計、娛樂、生醫與遠端控制等，其中一種應用發展是將其發展成具有2D平面正投影、背投影且可以互相轉換的多模式顯示器，此方案產物的潛在優勢在於，將體積3D顯示器透過合理的額外成本改裝，使之成為同時具備2D投影功能的特殊投影機，藉此將體積3D技術引入已存在的2D投影機市場。此項研究的內容是設計一個將體積3D顯示器與使用數位光處理(Digital Light Processing, DLP)的2D投影機結合、包含光源模組、照明及投影光學還有切換影像模式的光機結構的原型裝置，裝置結構中的兩種影像模式包共用部分組件、可互相切換以減少總零件數，切換過程中需要三到四個簡易的手動操作步驟，裝置在設計之初著重簡易性與低成本；裝置完成後也進行測試確保影像有足夠的亮度。

Volumetric 3D (V3D) display is a special type of 3D display technology. It can display, in a display volume that occupies real space, volumetric 3D (V3D) images, which have all physiological depth cues, including full motion parallax, and can be viewed from almost any direction and distance around the display volume by many viewers simultaneously with naked eyes. Its potential applications include industrial design, architecture, 3D animation modeling, entertainment, medical and remote operations. One specific V3D display concept includes multiple, convertible display modes including 2D front projection and 2D rear projection. The potential advantage of this product concept is to introduce V3D display into entertainment/gaming market through existing demand for 2D projectors by providing a special projector that can do more than a regular 2D projector with reasonable additional cost. This research designs light source module, illumination and projection optical layouts and opto-mechanical system including mode-switching mechanism of a DLP (Digital Light Processing) based projector and builds a prototype. The illumination optics contains two switchable modes with shared optical elements to minimized element counts. The switching between the two modes is operated manually by three to four simple motions. The design of the system emphasizes simplicity and low-cost. The prototype was tested to show the designed functions with improved projection brightness over previous prototype.

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