Liquid crystal lens for 2D/3D switchable and tunable endoscopy imaging system

• Main Authors: Amir, Hassanfiroozi, 哈明爾
• Other Authors: Shieh, Han-Ping D.
• Format: Others
• Language: en_US
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/twce6j

博士 === 國立交通大學 === 電機資訊國際學程 === 105 === Conventional 3D endoscopes consist of two lenses and two sensors, which enlarged the size of the instrument and have limitations imposed by stereo systems. We have successfully developed a hexagonal LC-lens array for capturing 3D images by using a single sensor using integral imaging. The significant finding from this study is that we propose convex-ring electrode to produces parabolic-like electric field distribution, thus lowering the focal length to less than 2.5 cm. which enables the endoscope to capture closer objects for medical applications, also better phase distribution and lower applying voltage. Because, the hexagonal LC lens is only switchable 2D/3D and not tunable in 2D mode we proposed a multi-functional liquid-crystal lens (MFLC-lens) for 2D and 3D switchable function. Importantly, this MFLC-lens can further modulate the focal length without mechanical movement in both 2D and 3D modes. To achieve multiple focal length lens functions, a novel structure with dual-layer electrode coated by a high resistive transparent film was developed. To enhance the quality of the taken image several polarized imaging techniques were investigated using linearly polarized, circularly polarized and quarter wave plate. Moreover, we simulated the wave-front employing Zernike polynomials to figure out the aberration in order to eliminate it.