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The liquid crystal device (LCD) parameters tester to determine the elector-optical properties of the smart glass thin PDLC films. Optical transmittance characteristics of elector-optical performance of the testing is done by the computer to obtain the appropriate parameter values, there are threshold voltage (Vth), voltage saturation (Vsat), contrast ratio (CR), off-State transmittance (Toff), rise time (τR) , decay time (τD) and applied voltage dependence of transmittance for all samples. parameter tester . LIQUID CRYSTAL DEVICE