Imaging element, imaging method and electronic apparatus
There is provided an imaging device including a pixel array section including pixel units two-dimensionally arranged in a matrix pattern, each pixel unit including a photoelectric converter, and a plurality of column signal lines disposed according to a first column of the pixel units. The imaging device further includes an analog to digital converter that is shared by the plurality of column signal lines.
1. An imaging device comprising:
a pixel array including a plurality of pixels two-dimensionally arranged in a matrix pattern;
a plurality of column signal lines disposed according to a first column of the pixels, wherein one or more of the plurality of column signal lines is selectively coupled to a comparator, wherein at least one column signal line of the plurality of column signal lines is connected to two or more pixels in the first column; and
an analog to digital converter shared by the plurality of column signal lines, wherein the analog to digital converter includes the comparator, and wherein the comparator includes:
a first differential pair unit coupled to a first column signal line of the plurality of column signal lines, wherein the first differential pair unit includes a transistor coupled to a second auto-zero connection node; and
a second differential pair unit coupled to a second column signal line of the plurality of column signal lines, wherein the second differential pair unit includes transistor coupled to a second auto-zero connection node, and wherein the first differential pair unit and the second differential pair unit share a transistor coupled to a third auto-zero connection node.
2. The imaging device according to claim 1 , wherein the plurality of column signal lines disposed according to the first column are parallel to each other.
3. The imaging device according to claim 1 ,
wherein pixels in even numbered rows share the first column signal line and pixels in odd numbered rows share the second column signal line.
4. The imaging device according to claim 1 , further comprising a switch for each of the plurality of column signal lines, wherein each switch is coupled to a first terminal of the comparator.
5. The imaging device according to claim 4 , further comprising:
a ramp signal generation circuit connected to a second terminal of the comparator; and
a counter unit connected to an output terminal of the comparator, wherein the counter unit is coupled to a data output signal line.
6. The imaging device according to claim 1 , wherein the first differential pair unit and the second differential pair unit are connected to a ramp signal node provided from a ramp signal generation circuit.
7. The imaging device according to claim 6 , wherein when the first differential pair unit is active, the second differential pair unit is inactive, and wherein when the first differential pair unit is inactive, the second differential pair unit is active.
8. The imaging device according to claim 7 , wherein pixels in even numbered rows share the first column signal line and pixels in odd numbered rows share the second column signal line.
9. The imaging device according to claim 1 , wherein an output from at least one of the first differential pair unit and the second differential pair unit is provided to at least one of a first amplification unit and a second amplification unit.
10. The imaging device according to claim 1 , wherein the first differential pair unit includes two transistors connected to a first auto-zero connection node, and the second differential pair unit includes two transistors connected to a second auto-zero connection node.
11. The imaging device according to claim 1 , further comprising:
a switch for each of the plurality of column signal lines; and
a capacitor for each of the plurality of column signal lines, wherein a first terminal of the capacitor is connected to the switch and a second terminal of the capacitor is connected to a first terminal of the comparator.
12. The imaging device according to claim 1 , further comprising:
a first pixel-sharing structure including at least two pixels in adjacent columns and at least two pixels in adjacent rows;
a second pixel-sharing structure including at least two pixels in adjacent columns and at least two pixels in adjacent rows,
wherein the first pixel-sharing structure and the second pixel-sharing structure are arranged in a same column, wherein the first pixel-sharing structure is connected to a first column signal line of the plurality of column signal lines, and wherein the second pixel-sharing structure is connected to a second column signal line of the plurality of column signal lines.
13. The imaging device according to claim 12 , further comprising color filters disposed on the at least two pixels in adjacent columns and the at least two pixels in adjacent rows, wherein the color filters are arranged according to a Bayer pattern.
14. The imaging device according to claim 1 , wherein a reading of a reset signal associated with a second signal column line of the plurality of signal column lines occurs between a reading of a reset signal associated with a first signal column line of the plurality of signal column lines and a reading of a signal corresponding to an amount of light received by a photodiode connected to the first column signal line.
15. An electronic apparatus comprising:
an optical system including at least one lens; and
an imaging element configured to receive light through the optical system, wherein the imaging element includes:
a pixel array including pixels two-dimensionally arranged in a matrix pattern;
a plurality of column signal lines disposed according to a first column of the pixels, wherein one or more of the plurality of column signal lines is selectively coupled to a comparator, wherein at least one column signal line of the plurality of column signal lines is connected to two or more pixels in the first column; and
an analog to digital converter shared by the plurality of column signal lines, wherein the analog to digital converter includes the comparator, and wherein the comparator includes:
a first differential pair unit coupled to a first column signal line of the plurality of column signal lines, wherein the first differential pair unit includes a transistor coupled to a second auto-zero connection node; and
a second differential pair unit coupled to a second column signal line of the plurality of column signal lines, wherein the second differential pair unit includes transistor coupled to a second auto-zero connection node, and wherein the first differential pair unit and the second differential pair unit share a transistor coupled to a third auto-zero connection node.
16. The electronic apparatus according to claim 15 , wherein the plurality of column signal lines disposed according to the first column are parallel to each other.
17. The electronic apparatus according to claim 15 ,
wherein pixels in even numbered rows share the first column signal line and pixels in odd numbered rows share the second column signal line.
18. The electronic apparatus according to claim 15 , further comprising a switch for each of the plurality of column signal lines, wherein each switch is coupled to a first terminal of the comparator.
19. The electronic apparatus according to claim 18 , further comprising:
a ramp signal generation circuit connected to a second terminal of the comparator; and
a counter unit connected to an output terminal of the comparator, wherein the counter unit is coupled to a data output signal line.
20. The electronic apparatus according to claim 15 , wherein the first differential pair unit and the second differential pair unit are connected to a ramp signal node provided from a ramp signal generation circuit.