Image sensor with anti-saturation function in pixel level

Details Image sensor with anti-saturation function in pixel level Image sensor with anti-saturation function in pixel level

2007-06-26

2007-06-26

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C348S308000

Reexamination Certificate

active

11423120

ABSTRACT:
In a CMOS image sensor of the invention, a dynamic range is varied at a per-pixel level by a light amount to prevent saturation without degrading color reproduction of an overall image. A photo diode generates charges in accordance with a received light amount. A drive transistor amplifies the charges generated in the photodiode at a given gain. Further, a saturation detector receives an output voltage from the drive transistor and judges the image sensor saturated if the output voltage is beyond a limited level. A switch switches on/off in response to the judgment of the saturation detector. Also, a plurality of floating diffusions store the charges of the photodiode transferred through the switch. The floating diffusions are selectively connected to both the photodiode and a gate of the drive transistor at on/off the switch.

REFERENCES:
patent: 2006/0243887 (2006-11-01), Boemler
patent: 1020040093947 (2004-11-01), None

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