H - Electricity – 04 – N
Patent
H - Electricity
04
N
H04N 5/378 (2011.01) H04N 5/365 (2011.01) H04N 5/374 (2011.01)
Patent
CA 2696500
The invention relates to matrix-array image sensors with MOS- technology active pixels, comprising a matrix-array of pixels arranged in rows and columns. To read the signal from a pixel, the reset potential present on a column conductor is sampled in two capacitors. The first capacitor is linked to an input of a comparator; the other input receives, through the second capacitor, a linear voltage ramp varying in a first direction for a first duration, then a linear voltage ramp in the reverse direction; a digital value N of the time between the start of this second ramp and the switching over of the comparator is counted; the useful potential present on the column conductor and representing the lighting of the pixel is sampled again, but in the first capacitor only; two ramps identical to the preceding ones are applied to the second input, through the second capacitor; a digital value N' of the time between the start of the second reverse ramp and the switching over of the comparator is counted, the difference between the two counts N and N' representing a measurement of the lighting of the pixel.
Lebouleux Nicolas
Ligozat Thierry
E2v Semiconductors
Marks & Clerk
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