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Organic PhotodiodesToday, most of the current image sensors and cameras are based on flat focal plane array (FPA) technology, including charge coupled devices (CCDs), complementary metal oxide semiconductor (CMOS) imager, or thin film transistors (TFTs) arrays on glass substrates. [1][2][3] The planar FPA requires complex multielement lenses to correct the image surface; i.e., the Petzval surface. [4] The nonidealities of the optical system can lead to a distorted and blurred image due to off-axis aberrations. To correct these problems, additional optical elements and high precision lens system are required, which result in complex and expensive optical system. Compared to the camera system with the flat FPA, a curved image surface mimicking a spherical human retina provides numerous advantages. [5] The image system with the curved image surface can provide a wide field of view (FOV), a low optical aberration, low 1/f number and less optical lens components leading to compact, cheaper, and lighter camera system. [4,6,7] Over the years, the fabrication of image sensors on curved surface has long been a challenging task among researchers due to the difficulty of developing fabrication methods suitable for curved surfaces. To name a few, Ko et al. developed a

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A compact collimated display system using an aspherical screen with a concave mirror is proposed. As the collimated display can provide a long viewing distance for the observer, it is commonly used for personal virtual flight simulators. To deliver a collimated image, the conventional collimated display requires a large system, but by using an aspherical screen with a concave mirror, the system size can be diminished. In this paper, a method of designing the compact collimated display system is demonstrated with simulation and experiment results. Also, a floating display and a depth camera for detecting hand gestures were combined with the proposed system for interaction.