METHOD OF READING AN IMAGE SENSOR SIGNAL AND IMAGE SENSOR
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 a...
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| creator | LIGOZAT THIERRY LEBOULEUX NICOLAS |
| description | 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. |
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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.</description><language>eng</language><subject>ELECTRIC COMMUNICATION TECHNIQUE ; ELECTRICITY ; PICTORIAL COMMUNICATION, e.g. TELEVISION</subject><creationdate>2010</creationdate><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20100916&DB=EPODOC&CC=US&NR=2010231772A1$$EHTML$$P50$$Gepo$$Hfree_for_read</linktohtml><link.rule.ids>230,308,776,881,25542,76290</link.rule.ids><linktorsrc>$$Uhttps://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=20100916&DB=EPODOC&CC=US&NR=2010231772A1$$EView_record_in_European_Patent_Office$$FView_record_in_$$GEuropean_Patent_Office$$Hfree_for_read</linktorsrc></links><search><creatorcontrib>LIGOZAT THIERRY</creatorcontrib><creatorcontrib>LEBOULEUX NICOLAS</creatorcontrib><title>METHOD OF READING AN IMAGE SENSOR SIGNAL AND IMAGE SENSOR</title><description>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.</description><subject>ELECTRIC COMMUNICATION TECHNIQUE</subject><subject>ELECTRICITY</subject><subject>PICTORIAL COMMUNICATION, e.g. TELEVISION</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2010</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZLD0dQ3x8HdR8HdTCHJ1dPH0c1dw9FPw9HV0d1UIdvUL9g9SCPZ093P0AQq7oIjzMLCmJeYUp_JCaW4GZTfXEGcP3dSC_PjU4oLE5NS81JL40GAjA0MDI2NDc3MjR0Nj4lQBAOa0KRA</recordid><startdate>20100916</startdate><enddate>20100916</enddate><creator>LIGOZAT THIERRY</creator><creator>LEBOULEUX NICOLAS</creator><scope>EVB</scope></search><sort><creationdate>20100916</creationdate><title>METHOD OF READING AN IMAGE SENSOR SIGNAL AND IMAGE SENSOR</title><author>LIGOZAT THIERRY ; LEBOULEUX NICOLAS</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_US2010231772A13</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2010</creationdate><topic>ELECTRIC COMMUNICATION TECHNIQUE</topic><topic>ELECTRICITY</topic><topic>PICTORIAL COMMUNICATION, e.g. TELEVISION</topic><toplevel>online_resources</toplevel><creatorcontrib>LIGOZAT THIERRY</creatorcontrib><creatorcontrib>LEBOULEUX NICOLAS</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>LIGOZAT THIERRY</au><au>LEBOULEUX NICOLAS</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>METHOD OF READING AN IMAGE SENSOR SIGNAL AND IMAGE SENSOR</title><date>2010-09-16</date><risdate>2010</risdate><abstract>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.</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY PICTORIAL COMMUNICATION, e.g. TELEVISION |
| title | METHOD OF READING AN IMAGE SENSOR SIGNAL AND IMAGE SENSOR |
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