Photoconversion device with capacitive compensation in shielded

Details Photoconversion device with capacitive compensation in shielded Photoconversion device with capacitive compensation in shielded

1991-09-30

1992-10-27

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

35821316, 357 30, H01J 4014

Patent

active

051591863

ABSTRACT:
A photoconversion device has light receiving cells and also a dark cell to provide a dark output to enable the signals from the light receiving cells to be compensated for noise due to dark current. The dark cell resembles the light cells, but its light receiving region is covered by a light shielding layer (5). Capacitive coupling between the light shielding layer (5) and a charge accumulation region (3) distorts the dark cell output so that it does not match the dark current noise in the light cell outputs. This capacitive coupling is reduced by interposing a conductive layer (1) between the light shielding layer and the charge accumulation region (2). Preferably the conductive layer (1) is connected to the read-out electrode. Preferably the read-out electrode (1) of the light cells is enlarged to further reduce the difference between the capacitance of the charge accumulation region (2) of the dark cell and that of the light cells.

REFERENCES:
patent: 4740824 (1988-04-01), Yano et al.
patent: 4794279 (1988-12-01), Yamamura et al.

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