Method for obtaining a high dynamic range read-out signal of a CMOS-based pixel structure and such CMOS-based pixel structure

  • US 6,011,251 A
  • Filed: 02/09/1998
  • Issued: 01/04/2000
  • Est. Priority Date: 06/04/1997
  • Status: Expired due to Term
First Claim
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1. A method for obtaining a read-out signal of a MOS-based pixel structure having in a MOS technology at least a photosensitive element with an output node and a memory element with a first switch therebetween, the method comprising the steps of while acquiring charge carriers on said output node of said photosensitive element, said charge carriers being converted from radiation impinging on the photosensitive element:

  • after a first time period opening said first switch thereby storing a first number of charge carriers on said memory element and creating a first signal;

    after a second time period, creating a second signal from a second number of said charge carriers being stored on said output node of said photosensitive element, andcombining at least said first and said second signals in order to obtain said read-out signal.

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