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An 8K4K-resolution 60fps 450ke−-saturation-signal organic-photoconductive-film global-shutter CMOS image sensor with in-pixel noise canceller | IEEE Conference Publication | IEEE Xplore

An 8K4K-resolution 60fps 450ke-saturation-signal organic-photoconductive-film global-shutter CMOS image sensor with in-pixel noise canceller


Abstract:

There is a growing demand for high-resolution and high-reality cameras for use in broadcasting, surveillance, and various other systems. Conventional papers report on res...Show More

Abstract:

There is a growing demand for high-resolution and high-reality cameras for use in broadcasting, surveillance, and various other systems. Conventional papers report on research and development of 8K ultra-high-definition television (UHDTV) systems, 8K full-resolution cameras [1], and 8K 240fps cameras that employ stacked sensors [2]. In these camera systems, a rolling-shutter method is used for scanning, since a global-shutter method has an area tradeoff between the photoelectric conversion region and the charge storage region [3-5]. However, this leads to a shutter distortion problem during the high-speed imaging and synchronization of multi-viewpoint imaging. To overcome this problem, a CMOS image sensor is developed that has an 8K4k resolution, a 60fps frame rate, and a 450ke- saturation signal, with an organic photoconductive film (OPF) laminated on the pixel circuits. Even with small (e.g., 3μσι) pixels, a global shutter can be realized without degradation of the saturation signal [6]. However, there still remains a requirement to achieve 8K4K resolution at 60fps readout speed. There are three potential strategies to achieve this: 1) high-speed cancellation of reset noise in single storage-type global shutter pixels, 2) high-speed readout with a long vertical signal line, and 3) high-saturation in global-shutter mode. For 1), in the conventional case, a feedback amplifier (FBAMP) is allocated to each column to affect noise cancellation, but there is a long noise suppression time due to the large time constant of the vertical signal line. An in-pixel noise canceller is developed to shorten the noise suppression time even when the length of the vertical signal line becomes four times longer than with a Full High Definition (FHD) sensor. Moreover, to utilize the advantages of the OPF image sensor's stacked structure, high-capacitance Metal-Insulator-Metal (MIM) capacitors are allocated in the metal interconnect area. For 2), since the photoelectric conversion film ...
Date of Conference: 11-15 February 2018
Date Added to IEEE Xplore: 12 March 2018
ISBN Information:
Electronic ISSN: 2376-8606
Conference Location: San Francisco, CA, USA

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