The result shows that the new type double pass polarization interference filter has better spectral characteristics in practice can reduce the number of retarders, and is expected to be used extensively in color separation and recombination system of liquid crystal on silicon projector. 结果表明,新型双通偏振干涉滤光片不仅具有更好的光谱特性,而且能进一步减少延迟片数目,具有非常重要的实用价值,可望在基于硅片的液晶投影仪分/合色系统中得到广泛应用。