In the past few years, there have been many attempts to commercialize Polymer Dispersed Liquid Crystal (PDLC) for Rear Projection Screen (RPS) in electrically switchable films and glass products. This application is based on the exceptional image quality of PDLC at a wide viewing angle. However, due to the high price of conventional switchable PDLC privacy glass, the integration of RPS in PDLC failed to attract large multimedia and entertainment markets. An obvious solution to this problem is the independent development and evaluation of PDLC for Passive Rear Projection Screen (PRPS) application. However, in order to approve the application of PDLC for this purpose, further optical and image (visual) analyses are required. This work is the first part of our research project on evaluation of PDLC for RPS application, where we studied the effect of material and process parameters on optical properties of passive PDLC screens. The results indicate a strong dependence of the performances of passive PDLC screen on the material and process parameters, though it offers great
In the present study, we report the experimental results related to the transient phenomenon, i.e., the time-dependent changes in the electro-optical properties of as-made polymer-dispersed liquid crystal (PDLC) films prepared by the UV-curing phase-separation method. This phenomenon occurs explicitly via polymer-induced phase separation when the matrix curing is not complete, some liquid crystal plasticized in the matrix, and some uncured pre-polymer components remain in the liquid crystal droplets. The outcome is the time-dependent changes in the electro-optical properties of as-made PDLC devices. Here, we provide the experimental results of Transient Phenomenon in a UV cured PDLC film and report on variations in some electro-optical parameters with time.
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