Speckle Noise Reduction by Using Fresnel-Patterned Nano-Sized Polymer Dispersed Liquid Crystal Lens

• Main Authors: Ting-Jui Chang, 張庭瑞
• Other Authors: 蘇國棟
• Format: Others
• Language: en_US
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/sv35pe

碩士 === 國立臺灣大學 === 光電工程學研究所 === 107 === In some traditional speckle noise reduction technologies, some of them may engender unwanted vibrating because of the mechanical moving part in the system, some of them may have complicated structure, others may lose an amount of light. In this thesis, we propose Fresnel-patterned nano-sized PDLC lens to achieve speckle noise reduction, which is a liquid crystal based technology. It provides a compact way to conduct speckle noise reduction with high transparency when the film is on the working state of speckle noise reduction. In this research, we start from our design and methods. Then, we talk about materials we used, calculations of speckle noise and fabrication process, including Precision Machining, replication process, spin coating of conductive layer and assembly of nano-sized PDLC lens. After that, we investigate the characteristics of our designed nano-sized PDLC lens, including transmittance-voltage curve and response time. Finally, we utilize our Fresnel-patterned nano-sized PDLC lens for speckle noise reduction and analyze the pictures and data we got from the experiment.