×

Pixel read circuitry

  • US 8,159,587 B2
  • Filed: 12/11/2008
  • Issued: 04/17/2012
  • Est. Priority Date: 12/13/2007
  • Status: Active Grant
First Claim
Patent Images

1. A method of reading voltages from an image sensor having an array of pixels, each pixel comprising at least one photodiode connectable to a storage node, the method comprising:

  • controlling each pixel in a row of pixels to store and output a first voltage value at a first instance, a second voltage value at a second instance, and a third voltage value at a third instance, the first, second and third voltage values being representative of charge accumulated by said photodiodes during an integration phase;

    comparing the first voltage value from each pixel with a reference threshold;

    sampling for each pixel, based on said comparison, only one of said second and third voltage values; and

    generating an output pixel value based on only the sampled one of said second and third voltage values.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×