| Summary: | 碩士 === 國立交通大學 === 光電工程系所 === 96 === The conventional absorbing polarizer is a key component in current LCDs. However, the optical efficiency of typical transmission type LCDs was low due to absorbing polarizer, color filter, light guide in back light module, and so on. Recently, nonabsorbing polarizers were widely noticed to recycle the light utilization. The basic concepts of nonabsorbing polarizers fall into two categories: reflecting and scattering.
The stretched PDLC film associated with polarization selectivity is a sort of scattering polarizer. With this film utilized in LCDs, the light is backscattered and recycled in the backlight module instead of being absorbed. The light efficiency was thus enhanced by polarization recycling mechanism. The purpose of this thesis was to investigate the optical properties of the stretched PDLC films. In conclusion, the fabricated film performed 50% transmittance along transmission axis and 0.06 for extinction ratio. Besides, the direction of polarization of the converted light can be controlled by varying the stretching direction of the films. The azimuthal polarizers are fabricated by change the stretching direction from linear to two-dimensional radially direction.
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