液晶投影機的發展介紹與對數位光源處理投影機之光機研究

Abstract

隨著投影顯示技術的發展，在投影系統及設備上的突破在最近幾年之內有著非常迅速的發展。投影機的原理與投影片或幻燈片相同，都是使用一個高亮度燈泡為光源，將內容投射至白色螢幕或牆壁上。就由微型面板的種類來區分，可將目前液晶投影機分成三大類設計，如高溫多晶矽穿透式液晶LCD面板、以及以德州儀器專利數位微鏡裝置（DMD）開發出來的數位光源處理器（DLP），還有被各界視為潛力新星的反射式液晶（LCOS）微型顯示器2年後有機會成為投影技術的黑馬。 因為LCD穿透式液晶投影機在市場上已經趨近於飽和的狀態，所以現今台灣的公司皆以開發DLP或LCOS液晶投影機作為一個出發點。由於市場對於體積小、性能高的投影機較有興趣，故本論文針對DLP投影機光學引擎的機構做一詳細的設計說明，機構元材料的選擇等等。因為產品必須控制在安全溫度內若溫度過高，否則會產生產品不穩定的情形發生。所以在光機引擎的散熱問題方面，本論文利用風道的增加來對付散熱的問題，使得把整個散熱問題給簡單化了。所以在日後開發新案子的同時，可以避免掉許許多多的錯誤，進而更快更準確的完成。

The development of projection system and equipment are improved significantly in the last few years thanks to the prosperous progress of the projection technology. The projector operation principle is the same as overhead projectors and slide projectors. The image of pictures or texts shown on the white wall or screen is projected through a high-illuminated light bulb. In terms of micro projection panel type, the projectors can be divided into 3 different categories. There are High temperature polysilicon (HTPS) transmissive LCD panel type, Digital Light Processing (DLP) type utilizing Digital Micromirror Device (DMD) chip which is developed by TI, and Liquid Crystal on Silicon (LCOS) which is regarded as the most promising design after a couple of years. The transmissive LCD projector approximately penetrates the projector market. Therefore most manufacturers in Taiwan nowadays are focusing on developing DLP or LCOS projectors as the start. Concerning the safety and stability issues of the products, it is very important to control the optical engine cooling. The solution provided in this thesis is increasing the vents in order to keep the temperature of the projector within the safety level. Thus, the stability of the projector is considerably improved and the possible thermal problems are eliminated for the future development of new projectors.