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对比了背投领域几种主要技术的原理和性能特点，同时介绍了多媒体投影系统所需要的各类光学薄膜的作用、参数和光学性能;井针对该领域国内外最新研究状况进行了调研，给出了现在所面临的关键技术难题井对其发展前景做了预测。
Contrasting the principles and performance characteristics of several main technologies in the field of rear projection, the functions, parameters and optical properties of various types of optical films required by the multimedia projection system are also introduced. The latest research status in the field at home and abroad is investigated, Out of the key technical problems facing now and made a prediction of its development prospects.