Multi-capacitance photodiode image sensor

Details Multi-capacitance photodiode image sensor Multi-capacitance photodiode image sensor

1992-11-16

1994-07-12

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

257435, H01J 4014

Patent

active

053291123

ABSTRACT:
A high density image sensor capable of higher resolution reading is realized by laminating layers on the photodiodes of the image sensor to allow additional capacitors to form therein in a vertically overlapping relation with the photodiodes. Each photodiode is formed on a substrate and includes a lower electrode, a photoelectric conversion layer, and a transparent electrode. The capacitors form where a transparent insulating layer and a transparent conductive layer are sequentially formed on the transparent electrode of the photodiode. The photodiode and the capacitors are electrically connected in parallel. The capacitors, one of which is outside the photodiode, do not enlarge the photodiode or affect the photo-/dark current ratio of the image sensor, thus enhancing the density of the image sensor and its resolution.

REFERENCES:
patent: 4672221 (1987-06-01), Saito et al.
patent: 4740824 (1988-04-01), Yano et al.
patent: 4943839 (1990-07-01), Kumano et al.

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