19 February 2018 Liquid-crystal microlenses with patterned ring-electrode arrays for multiple-mode two-dimensional imaging
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Proceedings Volume 10607, MIPPR 2017: Multispectral Image Acquisition, Processing, and Analysis; 1060705 (2018) https://doi.org/10.1117/12.2286289
Event: Tenth International Symposium on Multispectral Image Processing and Pattern Recognition (MIPPR2017), 2017, Xiangyang, China
Abstract
In this paper, a new liquid-crystal microlens array (LCMLA) with patterned ring-electrode arrays (PREAs) is investigated, which has an ability to acquire multiple-mode two-dimensional images with better electrically tunable efficiency than common liquid-crystal devices. The new type of LCMLA can be used to overcome several remarkable disadvantage of conventional liquid-crystal microlens arrays switched and adjusted electrically by relatively complex mechanism. There are two layer electrodes in the LCMLA developed by us. The top electrode layer consists of PREAs with different featured diameter but the same center for each single cell, and the bottom is a plate electrode. When both electrode structures are driven independently by variable AC voltage signal, a gradient electric field distribution could be obtained, which can drive liquid-crystal molecules to reorient themselves along the gradient electric field shaped, so as to demonstrate a satisfactory refractive index distribution. The common experiments are carried out to validate the performances needed. As shown, the focal length of the LCMLA can be adjusted continuously according to the variable voltage signal applied. According to designing, the LCMLA will be integrated continuously with an image sensors to set up a camera with desired performances. The test results indicate that our camera based on the LCMLA can obtain distinct multiple-mode two-dimensional images under the condition of using relatively low driving signal voltage.
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Xingwang Xie, Xingwang Xie, Xinjie Han, Xinjie Han, Huabao Long, Huabao Long, Wanwan Dai, Wanwan Dai, Zhaowei Xin, Zhaowei Xin, Dong Wei, Dong Wei, Xinyu Zhang, Xinyu Zhang, Haiwei Wang, Haiwei Wang, Changsheng Xie, Changsheng Xie, } "Liquid-crystal microlenses with patterned ring-electrode arrays for multiple-mode two-dimensional imaging", Proc. SPIE 10607, MIPPR 2017: Multispectral Image Acquisition, Processing, and Analysis, 1060705 (19 February 2018); doi: 10.1117/12.2286289; https://doi.org/10.1117/12.2286289
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