Solid-state image pickup device and method for driving the same
A system and method for driving a solid-state image pickup device including a pixel array unit including unit pixels. Each unit pixel includes a photoelectric converter, column signal lines and a number of analog-digital converting units. The unit pixels are selectively controlled in units of rows. Analog signals output from the unit pixels in a row selected by the selective control though the column signal lines are converted to digital signals via the analog-digital converting units. The digital signals are added among a number of unit pixels via the analog-digital converting units. The added digital signals from the analog-digital converting units are read. Each unit pixel in the pixel array unit is selectively controlled in units of arbitrary rows, the analog-distal converting units being operable to performing the converting in a (a) normal-frame-rate mode and a (b) high-frame-rate mode in response to control signals.
1. A method for driving a solid-state image pickup device comprising a pixel array unit including a plurality of pixel units which are two-dimensionally arranged in a matrix pattern, the plurality of pixel units including a first pixel unit and a second pixel unit, a first column signal line corresponding to the first pixel unit, a second column pixel line corresponding to the second pixel unit, a first comparator, a second comparator, and switching circuitry, the method comprising:
connecting, by the switching circuitry, the first column signal line to the first comparator and the second comparator selectively and the second column signal line to the first comparator and the second comparator selectively; and
comparing, by the first comparator and the second comparator, analog signals output from the pixel units to a reference signal, wherein the first comparator is adjacent to the second comparator,
wherein the switching circuitry is directly connected to the first column signal line, the second column signal line, the first comparator, and the second comparator.
2. The method according to claim 1 , wherein the solid-state image pickup device further includes a counter corresponding to at least one of the first comparator and the second comparator.
3. The method according to claim 2 , wherein the solid-state image pickup device further includes a storing circuit corresponding to the counter.
4. The method according to claim 1 , further comprising adding by the counter, digital signals by repeating a count operation on each analog signal of the pixel units.
5. A solid-state image pickup device comprising:
a pixel array unit including a plurality of pixel units which are two-dimensionally arranged in a matrix pattern, the plurality of pixel units including a first pixel unit and a second pixel unit;
a first column signal line connected to the first pixel unit;
a second column signal line connected to the second pixel unit;
a first comparator that compares analog signals with a reference signal;
a second comparator that compares analog signals with the reference signal; and
switching circuitry that connects the first column signal line to the first comparator and the second comparator selectively and connects the second column signal line to the first comparator and the second comparator selectively, wherein the first comparator is adjacent to the second comparator.
6. The solid-state image pickup device according to claim 5 , further comprising a counter that is connected to at least one of the first comparator and the second comparator.
7. The solid-state image pickup device according to claim 6 , wherein the counter adds digital signals by repeating a count operation on each analog signal of the pixel units.
8. The solid-state image pickup device according to claim 6 , wherein the counter is configured to output a first count value associated with a first phase and a second count value associated with a second phase.
9. The solid-state image pickup device according to claim 8 , further comprising an output line connected to a signal processing circuit.
10. The solid-state image pickup device according to claim 9 , wherein the signal processing circuit is configured to receive a difference between the first count value and the second count value through the output line.
11. The solid-state image pickup device according to claim 5 , wherein the pixel units include a photoelectric conversion element.
12. The solid-state image pickup device according to claim 5 , further comprising a reference signal generation circuit that generates the reference signal.
13. The solid-state image pickup device according to claim 5 , wherein the reference signal has a ramp waveform.
14. The solid-state image pickup device according to claim 5 , wherein the switching circuitry includes a first switch circuit and a second switch circuit.
15. The solid-stage image pickup device according to claim 14 , wherein the first switch circuit is configured to connect the first column signal line to the second comparator, and the second switch circuit is configured to connect the second column signal line to the first comparator.
16. A solid-state image pickup device comprising:
a pixel array unit including a plurality of pixel units which are two-dimensionally arranged in a matrix pattern, the plurality of pixel units including a first pixel unit and a second pixel unit;
a first column signal line connected to the first pixel unit;
a second column signal line connected to the second pixel unit;
a first comparator that compares analog signals with a reference signal;
a second comparator that compares analog signals with the reference signal; and
switching circuitry that directly connects the first column signal line to the first comparator and the second comparator selectively, wherein the first comparator is adjacent to the second comparator.
17. The solid-state image pickup device according to claim 16 , wherein the pixel units include a photoelectric conversion element.
18. The solid-state image pickup device according to claim 16 , further comprising a counter that is connected to at least one of the first comparator and the second comparator.
19. The solid-state image pickup device according to claim 18 , wherein the counter adds digital signals by repeating a count operation on each analog signal of the pixel units.
20. The solid-state image pickup device according to claim 18 , wherein the counter is configured to output a first count value associated with a first phase and a second count value associated with a second phase.
21. The solid-state image pickup device according to claim 20 , further comprising an output line connected to a signal processing circuit.
22. The solid-state image pickup device according to claim 21 , wherein the signal processing circuit is configured to receive a difference between the first count value and the second count value through the output line.
23. The solid-state image pickup device according to claim 16 , wherein the reference signal has a ramp waveform.