Image sensor

Details Image sensor Image sensor

1993-09-28

1995-07-18

Mancuso, Joseph

Television

Camera, system and detail

Solid-state image sensor

348307, H04N 5335

Patent

active

054346207

ABSTRACT:
An image sensor can reduce fixed pattern noise (FPN) caused by transistors used for reading pixel signals. The image sensor comprises photodiodes D.sub.1, D.sub.2, . . . connected to a precharge line L.sub.PR through respective precharge transistors (Tr1).sub.1, (Tr1).sub.2 ; and pixel amplification transistors (Tr2).sub.1, (Tr2).sub.2, . . . , one end thereof being connected to a signal read line L.sub.RE, the other end thereof being grounded through respective pixel switching transistors (Tr3).sub.1, (Tr3).sub.2, . . . , and the gates thereof being connected to respective nodes between the precharge transistors Tr1, (Tr1).sub.2, . . . and the photodiodes D.sub.1, D.sub.2, . . . According to signals provided by a timing signal generator 3, the pixel switching transistors (Tr3).sub.1, (Tr3).sub.2, . . . are sequentially turned ON and OFF one after another. During ON and OFF states of each of the pixel switching transistors, a correlated double sampling circuit provides a difference between values read out of the signal read line L.sub.RE.

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Solid-State Imaging Device and Application technology to Camera. Torikepps (Sep. 30, 1988).

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