本文介绍各种投影显示技术的目前水平与发展趋势，对于投影CRT与各种光阀的特点、竞争关系作了评述。
Current progresses in projection displays including projection CRTs and various light valves are summarized. Future trends and mutual competitions are commented as well.
DLP数字光处理技术是目前较先进的投影显示技术，但是对DL P光机投影屏特性测量系统的研究尚属探索阶段。
Digital Light Processing technology is one of the advanced projection display technologies at present, but the quality measuring system for DLP projection display screen is still on the research way.
投影显示技术是九十年代兴起的一种大屏幕显示技术，它集微电子技术、精密光学仪器技术以及精密机械技术为一体，已成为现代显示领域的主流。
This display technology integrates microelectronics, precision optical instrumentation and precision mechanical technology, and is becoming one of the main stream in the present display field.
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