Image sensor pixel circuit

Details Image sensor pixel circuit Image sensor pixel circuit

1997-06-12

1999-04-27

Allen, Stephone

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

348249, 348311, H04N 314, H04N 5335

Patent

active

058981683

ABSTRACT:
Disclosed is an image sensing device having a reduced number of transistors within each imager cell as compared to prior art devices. Each imager cell includes a photosensitive element providing a photocharge responsive to incoming light, and first, second and third transistors. The first transistor is coupled to an activation line, e.g., a row select line, that carries an activation signal to a first plurality of imager cells to selectively activate cells for image data readout. This transistor transfers the photocharge towards a reference circuit node within the image cell in response to the activation signal. The second transistor is operably coupled to the first transistor, and is operative to selectively set a voltage level at the reference node. The third transistor has a control terminal coupled to the reference node, and an output terminal coupled to an output data bus common to a second plurality of image cells, e.g., a column of cells. The third transistor providing an output signal on the data line related to the reference node voltage, which is indicative of an amount of light incident upon the photosensitive element.

REFERENCES:
patent: 4450484 (1984-05-01), Terakawa et al.
patent: 5122850 (1992-06-01), Burkey
patent: 5748232 (1998-05-01), Konuma

Affiliated with

Also associated with

Rating

Image sensor pixel circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Image sensor pixel circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Image sensor pixel circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-686637