Imaging with page-sized A-Si:H two-dimensional sensor arrays

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Abstract
We present a document imaging system using page-sized amorphous silicon 2D sensor arrays. Two arrays of approximately 8' X 10' in area are used. One has 512 X 560 pixels and the other one has 1536 X 1920 pixels. The scanner can operate in either a contact imaging mode or a projection mode. The system has a signal-to-noise ratio of 1000, limited by the noise in the readout amplifier. Using sequential flash lamp exposures with appropriate color filters, one can achieve color imaging of a document with a perfect registration. In this paper, we describe sensor structure, electrical properties, and system design of the imager. We discuss the potential of the amorphous silicon sensor array as an electronic color document input device. The high sensitivity of the array allows high-speed scanning of a document and medical x-ray imaging (with a phosphor layer).

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