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Tunable-Focus Liquid Crystal Compensator Using Polymer-Stabilized Liquid Crystals
|關鍵字:||liquid crystal;液晶;polymer stabilized liquid crystal;liquid crystal compensator;高分子穩固型液晶;液晶補償器||出版社:||機械工程學系所||引用:|| M. Ye, Y. Yokoyama, and S. Sato, “Liquid crystal lens prepared utilizing patterned molecular orientations on cell walls”, Applied Physics Letters, vol. 89, No. 14, p. 141112(2006)  B. Wang, Y. Sato, M. Kawamura, R. Yamaguchi, and S. Sato, “Transient properties during positive-negative switching of liquid crystal lens”, Molecular Crystals and Liquid Crystals, vol. 480, No. 1, p. 44 (2008)  M. Ye, B. Wang, and S. Sato, “Realization of liquid crystal lens of large aperture and low driving voltages using thin layer of weakly conductive material”, Optics Express, vol. 16, No. 6, p. 4302 (2008)  M. Ye, T. Sakamoto, M. Kawamura, R. Yamaguchi, and S. Sato, “Liquid Crystal Microlens Driven by Two Voltages”, Molecular Crystals and Liquid Crystals, vol. 1480, No. 1, p. 31 (2008)  H. Ren, D. W. Fox, B. Wu, and S.T. Wu, “Liquid crystal lens with large focal length tunability and low operating voltage”, Optics Express, vol. 15, No. 18, p. 11328 (2007)  M. Honma, T. Nose, and S. Sato, “Enhancement of Numerical Aperture of Liquid Crystal Microlenses Using a Stacked Electrode Structure”, Japanese Journal of Applied Physics, vol. 39, No. 8, p. 4799 (2000)  B. Wang, M. Ye, M. Honma , T. Nose, and S. Sato, “Liquid Crystal Lens with Spherical Electrode”, Japanese Journal of Applied Physics, vol. 41, No. 11A, p. L1232 (2002)  M. Ye , and S. Sato, “Liquid crystal lens with focus movable along and off axis”, Optics Communications, vol. 225, No. 4, p. 277 (2003)  M. Ye, B. Wang, and S. Sato, “Double-Layer Liquid Crystal Lens”, Japanese Journal of Applied Physics, vol. 43, No. 3A, p. L352 (2004)  M. Ye, B. Wang, and S. Sato , “Polarization-Independent Liquid Crystal Lens With Four Liquid Crystal Layers”, IEEE Photonics Technology Letters, vol. 18, No. 3, p. 505 (2006)  G. Li, P. Valley, P. Äyräs, D. L. Mathine, S. Honkanen, and N. Peyghambarian, “High-efficiency switchable flat diffractive ophthalmic lens with three-layer electrode pattern and two-layer via structures”, Applied Physics Letters, vol. 90, No.11, p.111105 (2007)  M. Ye, B. Wang, M. Yamaguchi, and S. Sato, “Reducing Driving Voltages for Liquid Crystal Lens Using Weakly Conductive Thin Film”, Japanese Journal of Applied Physics, vol. 47, No. 6, p. 4597 (2008)  M. Kawamura, H. Goto, and S. Sato, “Transient properties of a liquid crystal lens with multiple divided circularly hole-patterned electrodes”, International Symposium on Optomechatronic Technologies, vol. 1, No. 21, p. 1 (2009)  P. Valley, D. L. Mathine, M. R. Dodge, J. Schwiegerling, G. Peyman, and N. Peyghambarian, “Tunable-focus flat liquid-crystal diffractive lens”, Optics Letters, vol. 35, No. 3, p. 336, ( 2010)  松本正一,和角田市良 合著, “液晶的基礎與應用”, 國立編譯館 (1996)  P. Yeh and C. Gu, “Optics of liquid crystal displays”, John Wiley & Sons(1999)  I. C. Khoo, “Liquid crystals：Physical properties and nonlinear optical phenomena ”,John Wiley & Sons(1995)  P. G. de Gennes and J. prost, “The physics of Liquid Crystal”, 2nd ed., Clarendon Press, Oxford (1993)  林罡鼎, “新式可變焦距液晶補償器之研究”, 國立中興大學機械工程學系碩士論文 (民國97年)  H. Zocher, “The effect of a magnetic field on the nematic state”, Transactions of Faraday Society, vol. 29, p. 945(1933)  F. C. Frank, “I. Liquid crystals. On the theory of liquid crystals”, Discussions of Faraday Society, vol. 25, p. 19(1958)  E. W. Marchand, “Gradient index optics”, New York Academic Press(1978)  林宸生,和陳德請 合著,“近代光電工程導論”, 全華科技圖書股份有限公司 (2006)||摘要:||
本研究利用液晶(liquid crystal, LC)之雙折射(birefringence)性質與其易受外加電場影響而重新排列取向的光電特性，並結合高分子穩固型液晶(polymer stabilized liquid crystal, PSLC) 技術與新式電極的設計，製作出一具有多種聚焦模式的液晶補償器，此補償器可與微型相機模組(compact camera module, CCM)之定焦鏡頭作搭配，不需透過機械式致動裝置即可達到變焦的效能，達到縮減相機鏡頭之重量與體積之目的。
Based on the characteristics of birefringence and electro-optical activity of liquid crystal (LC), which can be tuned and aligned by the external electric field, this study proposes a liquid crystal compensator with multiple focus modes by combining the technology of polymer stabilized liquid crystal (PSLC) with novel electrode design. This compensator can be collocated with the fixed-focus lens of a compact camera module (CCM) to achieve the capability of tunable focus without using the mechanical actuator. Hence, both the weight and size of the camera lens can be well reduced.
In the paper, the fixed-focus lens module of a cell phone was first adopted as the simulation model. We simulated the focus variation under different operating modes by using the optical simulation tool Zemax. The surface of “gradient 1”, which has the feature of gradient index of refraction, was used to simulate the liquid crystal compensator. It provided switchable modes to compensate the far and near of image in simulations. In fabrication, the LC was mixed with UV-curable monomer (RM257) to form the PSLC as the device material and associated with the novel electrode. By means of UV exposure, different stabilized focus modes could be properly created.
Finally, the compensator was fabricated and integrated into an optical setup in experiments. The phase retardation effects of the device under various applied voltages for different operating modes were examined. Besides, the device was also combined with a fix-focus lens to verify the variations of image formation corresponding to two modes. The experimental results show that it could accordingly switch its focusing capability for compensating the image formation in two modes.
Keywords: liquid crystal, polymer stabilized liquid crystal, liquid crystal compensator
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