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400 dpi integrated contact type linear image sensors with poly-Si TFT's analog readout circuits and dynamic shift registers

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5 Author(s)
T. Kaneko ; Hitachi Ltd., Ibaraki, Japan ; Y. Hosokawa ; M. Tadauchi ; Y. Kita
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Four-hundred-dots-per-inch (dpi) sensors, including poly-Si thin-film-transistor (TFT) scanning circuits, and a-Si photodiodes fabricated on borosilicate glass have been developed. This contact-type image sensor contains TFT analog buffer amplifiers in the readout circuits. The scanning circuits can operate in a frequency range between 200 kHz and 1 MHz. The readout circuits incorporating TFT analog impedance converters decrease photodiode impedance by more than three orders of magnitude and improve the linearity between illumination intensity and the sensor output. High-resolution reading is achieved by the new contact-type linear image sensors with a storage time of 2 ms/line

Published in:

IEEE Transactions on Electron Devices  (Volume:38 ,  Issue: 5 )