Projection display includes three distinct technologies : crt , dlp and lcd . in chapter three , the technology and product trends in the projection display are analyzed , and different technologies are used in different application segments . light output is one of the most important parameters and being traded off for improved resolution , contrast ratio , weight , color , uniformity , cost and other desirable features 投影显示主要包括三种技术： crt投影显示、 dlp投影显示和液晶投影显示，各种投影显示技术的原理及其应用是本文第三章的内容，并重点讨论了dlp投影显示技术、液晶光阀( lclv )投影显示技术和液晶板( lcd )投影显示技术。
