Solid-state image pickup device and driving method therefor
View Patent ↗In a MOS solid-state image pickup device including two capacitors storing electric charges of pixels in two rows for each column and two charge-voltage conversion amplifiers for outputting pixel signals corresponding to the electric charges stored in the capacitors, a switch for selectively short-circuiting input terminals of the charge-voltage conversion amplifiers and a switch for short-circuiting output terminals of the charge-voltage amplifiers are provided. In a first driving mode, the switches are not short-circuited so that analog signals are read in the form of dual-rail outputs. In a second driving mode, the switches are short-circuited so that an average of the analog signals is read.
1. A solid-state image pickup device comprising:
a pixel array area in which pixels are two-dimensionally arranged in a matrix, each pixel including a photoelectric conversion portion;
a plurality of capacitors which store electric charges of the pixels in a plurality of rows for each column, the electric charges being output from the pixel array area via a vertical signal line;
a plurality of output circuits to output analog signals corresponding to the electric charges stored in the plurality of capacitors;
first switching means to selectively short-circuit input terminals of the plurality of output circuits; and
second switching means to selectively short-circuit output terminals of the plurality of output circuits,
wherein,
the plurality of capacitors and the plurality of output circuits are provided so as to correspond to a plurality of horizontal signal lines, and the electric charges output from the plurality of capacitors via the plurality of horizontal signal lines are converted into voltages by the plurality of output circuits.
2. The solid-state image pickup device according to claim 1 , wherein:
the plurality of capacitors and the plurality of output circuits are provided so as to correspond to a plurality of horizontal signal lines; and
currents corresponding to the electric charges output from the plurality of capacitors via the plurality of horizontal signal lines are converted into voltages by the plurality of output circuits.
3. The solid-state image pickup device according to claim 1 , wherein:
the plurality of capacitors and the plurality of output circuits are provided for the vertical signal line; and
the electric charges output from the plurality of capacitors are converted into voltages by the plurality of output circuits and output to a plurality of horizontal signal lines.
4. A solid-state image pickup device comprising:
a pixel array area in which pixels are two-dimensionally arranged in a matrix, each pixel including a photoelectric conversion portion;
a plurality of capacitors which store electric charges of the pixels in a plurality of rows for each column, the electric charges being output from the pixel array area via a vertical signal line;
a plurality of output circuits configured to output analog signals corresponding to the electric charges stored in the plurality of capacitors;
first switching means to selectively short-circuit input terminals of the plurality of output circuits;
a first driving mode in which the first switching means is not short-circuited so that the analog signals are read independently from the plurality of output circuits; and
a second driving mode in which the first switching means is short-circuited so that an average of the analog signals is read from the plurality of output circuits.
5. The solid-state image pickup device according to claim 4 , further comprising second switching means to selectively short-circuit output terminals of the plurality of output circuits in association with the first switching means.
6. A driving method for a solid-state image pickup device including a pixel array area in which pixels are two-dimensionally arranged in a matrix, each pixel including a photoelectric conversion portion; a plurality of capacitors to store electric charges of the pixels in a plurality of rows for each column, the electric charges being output from the pixel array area via a vertical signal line; a plurality of output circuits configured to output analog signals corresponding to the electric charges stored in the plurality of capacitors; and first switching means to selectively short-circuit input terminals of the plurality of output circuits, the method comprising:
causing the first switching means to be in a non-short-circuit state so that the analog signals are read independently from the plurality of output circuits.
7. The driving method for the solid-state image pickup device according to claim 6 , the method further comprising:
second switching means to selectively short-circuit output terminals of the plurality of output circuits in association with the first switching means.
8. The driving method for the solid-state image pickup device according to claim 6 , wherein the analog signals are read from one of the plurality of output circuits.
9. The driving method for the solid-state image pickup device according to claim 6 , wherein the analog signals are read from the plurality of output circuits in parallel.
10. A driving method for a solid-state image pickup device including a pixel array area in which pixels are two-dimensionally arranged in a matrix, the each pixel including a photoelectric conversion portion; a plurality of capacitors which store electric charges of the pixels in a plurality of rows for each column, the electric charges being output from the pixel array area via a vertical signal line; a plurality of output circuits configured to output analog signals corresponding to the electric charges stored in the plurality of capacitors; and first switching means to selectively short-circuit input terminals of the plurality of output circuits, the method comprising:
causing the first switching means to be in a short-circuit state so that an average of the analog signals is read from the plurality of output circuits; and
second switching means to selectively short-circuit output terminals of the plurality of output circuits in association with the first switching means.
11. The driving method for the solid-state image pickup device according to claim 10 , wherein the average is read from all the plurality of output circuits.
12. The driving method for the solid-state image pickup device according to claim 10 , wherein the average is read from one of the plurality of output circuits and an output side of the other output circuit is blocked.
13. A driving method for a solid-state image pickup device including a pixel array area in which pixels are two-dimensionally arranged in a matrix, each pixel including a photoelectric conversion portion; a plurality of capacitors which store electric charges of the pixels in a plurality of rows for each column, the electric charges being output from the pixel array area via a vertical signal line; a plurality of output circuits configured to output analog signals corresponding to the electric charges stored in the plurality of capacitors; and first switching means to selectively short-circuit input terminals of the plurality of output circuits, the method comprising:
selectively driving the solid-state image pickup device in a first driving mode in which the first switching means is not short-circuited so that the analog signals are read independently from the plurality of output circuits and in a second driving mode in which the first switching means is short-circuited so that an average of the analog signals is read from the plurality of output circuits.
14. The driving method for the solid-state image pickup device according to claim 13 , wherein the solid-state image pickup device further includes second switching means to selectively short-circuit output terminals of the plurality of output circuits in association with the first switching means.
15. The driving method for the solid-state image pickup device according to claim 13 , wherein the analog signals are read from one of the plurality of output circuits in the first driving mode.
16. The driving method for the solid-state image pickup device according to claim 13 , wherein the analog signals are read from the plurality of output circuits in parallel in the first driving mode.
17. The driving method for the solid-state image pickup device according to claim 13 , wherein the average is read from all the plurality of output circuits in the second driving mode.
18. The driving method for the solid-state image pickup device according to claim 13 , wherein the average is read from one of the plurality of output circuits and an output side of the other output circuit is blocked in the second driving mode.