Image sensor

Details Image sensor Image sensor

1992-10-06

1994-05-03

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

257 53, H01J 4014

Patent

active

053089693

ABSTRACT:
An image sensor is provided with a plurality of photodiodes each having a better forward-current responsiveness and a smaller dark current in the reverse direction. Each of the photodiodes includes a two-layered photoelectric conversion layer made of non-doped hydrogenated amorphous silicon. One of these two layers, which has an interface that prevents electrons from escaping when photogenerated electric charge is stored, is deposited at a lower temperature than the other. The photodiodes are arranged in rows on a transparent electrode. The photodiodes operate in pairs, each pair corresponding to one picture element and having a first photodiode connected to a second photodiode in series, with opposite polarity. All the first photodiodes are connected to a detecting circuit and all the second photodiodes are connected to a pulse generating circuit.

REFERENCES:
patent: 4784702 (1988-11-01), Henri
patent: 4945243 (1990-07-01), Arques
patent: 5093727 (1992-03-01), Kakinuma et al.

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