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Proceedings Paper

Stacked color image sensor using wavelength-selective organic photoconductive films with zinc-oxide thin film transistors as a signal readout circuit
Author(s): Hokuto Seo; Satoshi Aihara; Masakazu Namba; Toshihisa Watabe; Hiroshi Ohtake; Misao Kubota; Norifumi Egami; Takahiro Hiramatsu; Tokiyoshi Matsuda; Mamoru Furuta; Hiroshi Nitta; Takashi Hirao
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Paper Abstract

Our group has been developing a new type of image sensor overlaid with three organic photoconductive films, which are individually sensitive to only one of the primary color components (blue (B), green (G), or red (R) light), with the aim of developing a compact, high resolution color camera without any color separation optical systems. In this paper, we firstly revealed the unique characteristics of organic photoconductive films. Only choosing organic materials can tune the photoconductive properties of the film, especially excellent wavelength selectivities which are good enough to divide the incident light into three primary colors. Color separation with vertically stacked organic films was also shown. In addition, the high-resolution of organic photoconductive films sufficient for high-definition television (HDTV) was confirmed in a shooting experiment using a camera tube. Secondly, as a step toward our goal, we fabricated a stacked organic image sensor with G- and R-sensitive organic photoconductive films, each of which had a zinc oxide (ZnO) thin film transistor (TFT) readout circuit, and demonstrated image pickup at a TV frame rate. A color image with a resolution corresponding to the pixel number of the ZnO TFT readout circuit was obtained from the stacked image sensor. These results show the potential for the development of high-resolution prism-less color cameras with stacked organic photoconductive films.

Paper Details

Date Published: 25 January 2010
PDF: 8 pages
Proc. SPIE 7536, Sensors, Cameras, and Systems for Industrial/Scientific Applications XI, 753602 (25 January 2010); doi: 10.1117/12.838347
Show Author Affiliations
Hokuto Seo, NHK Science & Technology Research Labs. (Japan)
Satoshi Aihara, NHK Science & Technology Research Labs. (Japan)
Masakazu Namba, NHK Science & Technology Research Labs. (Japan)
Toshihisa Watabe, NHK Science & Technology Research Labs. (Japan)
Hiroshi Ohtake, NHK Science & Technology Research Labs. (Japan)
Misao Kubota, NHK Science & Technology Research Labs. (Japan)
Norifumi Egami, NHK Science & Technology Research Labs. (Japan)
Takahiro Hiramatsu, Kochi Univ. of Technology (Japan)
Tokiyoshi Matsuda, Kochi Univ. of Technology (Japan)
Mamoru Furuta, Kochi Univ. of Technology (Japan)
Hiroshi Nitta, Kochi Univ. of Technology (Japan)
Takashi Hirao, Kochi Univ. of Technology (Japan)

Published in SPIE Proceedings Vol. 7536:
Sensors, Cameras, and Systems for Industrial/Scientific Applications XI
Erik Bodegom; Valérie Nguyen, Editor(s)

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