对施加电场时呈透明态(ON态)的聚合物分散液晶(PDLC)膜用作透明投影屏幕的原理给出定性与定量的描述和分析。在PDLC-ON态测试样品的透光率随入射角变化曲线,发现 S偏振光透光率不受 PDLC膜的影响,P 偏振光透光率随入射角变化受PDLC膜的影响衰减严重,发生散射。建立了P偏振光透光率随入射角度变化物理模型,给出了P偏振光的透光率的表达式。模拟计算得出理论曲线,与实验曲线相符合,进而解释了 PDLC-ON 态作为透明投影屏幕的成像原理。
The principle of polymer dispersed liquid crystal film as transparent proj ection screen on the application of electric field (ON state)is described and analyzed qualitatively and quantitatively.The transmittance curves with incident angle of samples are tested at PDLC-ON state.It shows that the transmittance of S polarized light is not affected by the PDLC film,while the transmittance of P polar-ized light decreases obviously.The physical model of the change of P polarized light transmittance with the incident angle is established,and the expression of the transmittance of P polarized light is given.The theoretical curve fits well with the experimental curve,which explains the imaging princi-ple of the PDLC ON state as the transparent proj ection screen.
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