Ccd image sensor with vertical overflow drain

Details Ccd image sensor with vertical overflow drain Ccd image sensor with vertical overflow drain

1989-12-07

1990-10-16

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821323, 35821319, 257 24, H04N 5228

Patent

active

049639838

ABSTRACT:
An image sensor is fabricated on a semiconductor substrate and comprises a well formed in the substrate, photo sensing elements formed in the well, vertical shift registors coupled to the columns of the photo sensing elements, a horizontal shift registor coupled to the vertical shift registors and a photo shield plate exposing the photo sensing elements to optical images, in which the photo shield plate remains in a first voltage level for restriction of production of ineffectual electric charges but is biased to a second voltage level for promoting the production of effectual electric charges after the semiconductor substrate is biased so as to allow a punch-through phenomenon to take place for discharging the ineffectual electric charges from the photo-sensing elements to the substrate, so that a variable electronic shutter is achieved under biasing the photo shield plate and the substrate without an extremely high voltage level.

REFERENCES:
patent: 4849814 (1989-07-01), Van De Skeg
patent: 4875100 (1989-10-01), Yonemoto et al.
patent: 4912560 (1990-03-01), Osawa et al.

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