Active matrix of amorphous silicon multijunction color sensors for document imaging

Lemmi, F.; Mulato, M.; Ho, J.; Lau, R.; Lu, J. P.; Street, R. A.; Palma, F.
March 2001
Applied Physics Letters;3/5/2001, Vol. 78 Issue 10, p1334
Academic Journal
An integrated color image sensor, made entirely with amorphous silicon (a-Si:H) large-area technology, is presented. The a-Si:H based sensor is a double-junction p-i-n-i-p photodiode that discriminates two spectral bands according to the bias voltage. The active-matrix addressed array has 512x512 pixels with 75 μm pixel pitch and uses thin-film transistors as pixel switches. The array structure and the spectral response are discussed, and color images taken by the system using two bias voltages demonstrate the compatibility of color sensors with large-area active-matrix addressing techniques. © 2001 American Institute of Physics.


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