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Recently, a variety of external accessory devices have been developed for smart phone. Among them, external devices which communicate via earphone jack on smartphone are prominent because they are small and compact and can be fixed on smartphone. This method is ideal for devices that do not require high-speed data transfer. In this paper, we present data transmission via smartphone earphone jack for infrared depth maps. Depth map is an image or image channel that contains information relating to the distance of the surfaces of scene objects from a viewpoint. And it can be measured using IR camera. We are now developing a compact image sensor that produces depth map of image.

As compared with 3G video communication, video conference with handset does not gain popularity because the technology of micro-display is not mature. LCoS display has small volume and suitable for mobile projection display of video conference. In this paper, we propose and design LCoS back-plane with frame buffer pixel circuit composed of three transistors and two capacitors. This pixel circuit enables data transfer of all pixels to be done simultaneously in a frame-at-atime fashion so that the brightness can be maximized. The LCoS back-plane is designed with 0.35um highvoltage CMOS technology. The size of a pixel is 13.5 x 13.5 um 2 and the display size is 0.53" for SVGA (800x600) panel.

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