Charge storage image scanner having equalizing pre-charge and re

Details Charge storage image scanner having equalizing pre-charge and re Charge storage image scanner having equalizing pre-charge and re

1997-12-31

2000-02-15

Nguyen, Madeleine

Facsimile and static presentation processing

Facsimile

Picture signal generator

348294, H04N 104, H04N 314

Patent

active

060259353

ABSTRACT:
A Contact Image Sensor (CIS) system utilizing a phototransistor sensing element that consists of a mechanism to pre-charge or inject a "background charge" into the storage node and allow the charge to reset through the same output base-to-emitter junction. This pre-charge and reset process removes the residual image and replenishes the charge lost by the base-to-emitter sub-threshold leakage current. Furthermore, the reset of the injected charge through the same output base-to-emitter junction automatically sets the phototransistor to an initial dark level, which is at the start of a linear region of the response versus illumination curve, and thus substantially improves the photo-response linearity.

REFERENCES:
patent: 5650864 (1997-07-01), Tseng et al.
patent: 5724094 (1998-03-01), Tseng et al.
patent: 5898168 (1999-04-01), Gowda et al.
patent: 5900625 (1999-05-01), Baumgartner
patent: 5917960 (1999-06-01), Sugawa
patent: 5920274 (1999-07-01), Gowda et al.

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