Projection display has been growing up rapidly in the late 1990 ' s . this display technology integrates microelectronics , precision optical instrumentation and precision mechanical technology , and is becoming the one of the main stream in the present display field 投影顯示技術(shù)是九十年代興起的一種大屏幕顯示技術(shù),它集微電子技術(shù)、精密光學(xué)儀器技術(shù)以及精密機械技術(shù)為一體,已成為現(xiàn)代顯示領(lǐng)域的主流。