Driving method for discharging overflow charges in a solid state

Details Driving method for discharging overflow charges in a solid state Driving method for discharging overflow charges in a solid state

1990-06-07

1991-10-15

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

35821319, 35821326, H04N 5232

Patent

active

050579266

ABSTRACT:
A method of driving a solid-state imaging device for discharging optical charge stored in a channel area of a solid-state imaging device so as to adjust exposure. In a solid-state imaging device having a horizontal-type overflow drain structure in which an overflow drain is formed at a channel stop for dividing a channel area, optical charge stored in the channel area is transferred in an opposite direction to a reading direction during a vertical scanning period and a potential barrier between the channel area and the overflow drain is extinguished during the period of transfer of optical charge, thereby discharging the charge. The optical charge stored again in the channel area is transferred in the reading direction within a blanking period during the vertical scanning period. In driving a device having a vertical-type overflow drain structure in which a channel area is formed by being divided in a diffusion area formed on a semiconductor substrate, optical charge stored in the channel area is transferred in an opposite direction to a reading direction during a vertical scanning period and a potential barrier between the channel area and the semiconductor substrate is extinguished during the period of transfer of the optical charge, thereby discharging the optical charge. The optical charge stored again in the channel area is transferred in the reading direction within a blanking period during the vertical scanning period. Exposure of the solid-state imaging device is adjusted by means of a discharge timing.

REFERENCES:
patent: 4875100 (1989-10-01), Yonemoto et al.
patent: 4875101 (1989-10-01), Endo et al.
patent: 4885626 (1989-12-01), Coutures
patent: 4912560 (1999-03-01), Osawa et al.

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