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Category International Presentation
Paper Title Liquid crystal-based lenticular lens array with laterally shifting capability of focusing
Conference name IC ME&D
Author Hyungjin Kim, Jiyoon Kim, In-Ho Lee, Sin-Doo Lee
Paper code Place Seoul
page Year/date 2015/05/22
Acknowledgements This work was supported in part by Samsung Display Co., Ltd.
Abstract  For several decades, lenticular lens arrays have been widely implemented in many electro-optical systems such as autostereoscopic three-dimensional (3D) displays and for applications in optical signal processing as well as optical data storage. Among several types of the lenticular lenses, the most promising one is based on liquid crystals owing to the simplicity in fabrication, the compactness, and the tuning capability at low voltages resulting from high birefringence and large dielectric anisotropy. In conventional lenticular lens arrays, the focusing regions are periodically arranged but they are fixed laterally. Even in the tunable case, the location of focusing and defocusing remains unchanged irrespective of an applied volatge. With the help of a sophisticated lenticular lens array with the lateral shift of the focusing effect, a new type of an autostereoscopic 3D display with higher resolution and more viewpoints than a traditional one may be developed.
 In this work, we demonstrated an LC-based lenticular lens array with the laterally shifting capability of focusing in an architecture comprising of periodic convex lenses on one substrate and concave lenses on the other as shown in Fig. 1. The two types of the lenticular lenses, complementary to each other, were fabricated using an imprinting technique. The two substrates were assembled in such manner that the center of the lens on one substrate was located exactly above the boundary of the lens on the other. The inner surfaces of the two substrates were unidirectionally rubbed to promote the homogeneous alignment of the LC along the direction of the lenticular lenses. For the incident light polarized linearly along the lenticular lens direction, under no applied voltage, the focusing effect comes primarily from the concave lens when the extraordinary refractive index (ne) of the LC is matched with the refractive index of the convex lens as shown in Fig. 1(a). On the other hand, in the presence of an applied voltage, the focusing effect originates from the convex lens when the ordinary of refractive index (no) of the LC coincides with the refractive index of the convex lens as shown in Fig. 1(b). Our new concept of the LC-based lenticular lens array having the lateral shift of focusing would be useful for designing a new class of autostereoscpic 3D display systems.
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