Device, system, mobile object, and apparatus
A device includes a pixel unit, a selection unit, and a first generation unit. The pixel unit has a plurality of pixels arranged in a plurality of rows. Each pixel includes a quenching circuit configured to receive a signal for determining start and end of an exposure period and a photodiode coupled to the quenching circuit. The selection unit is configured to simultaneously receive a plurality of clock signals of different periods and select a clock signal to be outputted from the plurality of clock signals. The first generation unit is configured to generate the signal by using the outputted clock.
1. A device comprising:
a pixel unit having a plurality of pixels arranged in a plurality of rows, each pixel including a quenching circuit configured to receive a signal for determining start and end of an exposure period and a photodiode coupled to the quenching circuit;
a selection unit configured to simultaneously receive a plurality of clock signals of different periods and select a clock signal to be outputted from the plurality of clock signals; and
a first generation unit configured to generate the signal by using the outputted clock signal.
2. The device according to claim 1 further comprising:
a second generation unit configured to simultaneously generate the plurality of clock signals by using a reference clock signal.
3. The device according to claim 1 , further comprising:
a plurality of pads configured to simultaneously receive the plurality of clock signals from the outside of the device.
4. The device according to claim 1 , wherein
a period of the selected clock signal corresponding to a pixel in a portion of a collection of the plurality of rows of the plurality of pixels is different from a period of the selected clock signal corresponding to a pixel in another portion of the collection of the plurality of rows of the plurality of pixels.
5. The device according to claim 1 , wherein
the selection unit is configured to select the clock signal in response to a trigger signal for controlling start of the exposure period.
6. The device according to claim 1 , wherein
a length of the exposure period is controlled by using the selected clock signal.
7. The device according to claim 1 , further comprising:
a counter unit configured to generate a count value by counting the selected clock signal; and
a control unit configured to control end of the exposure period based on the count value.
8. The device according to claim 7 , wherein
the plurality of pixels each include a transistor having a gate,
the device further comprising a third generation unit configured to feed a control signal to the gate, wherein
the control unit is configured to output a signal for controlling end of the exposure period to the third generation unit.
9. The device according to claim 8 , further comprising:
a scanner unit configured to scan the plurality of rows in units of one row, or two or more rows, the scanner unit including a plurality of row driver units each corresponding to a portion of a collection of the plurality of rows, wherein
the plurality of row driver units each including the third generation unit and the control unit.
10. The device according to claim 9 , wherein
the plurality of row driver units each include the counter unit.
11. The device according to claim 1 , wherein
during the exposure period of a pixel in a portion of a collection of the plurality of rows of the plurality of pixels,
the selection unit corresponding to a pixel in another portion of the collection of the plurality of rows of the plurality of pixels changes the clock signal to be outputted to another clock signal out of the plurality of clock signals.
12. The device according to claim 1 , wherein
while a signal is read from a pixel in a portion of a collection of the plurality of rows of the plurality of pixels,
the selection unit corresponding to a pixel in another portion of the collection of the plurality of rows of the plurality of pixels changes the clock signal to be outputted to another clock signal out of the plurality of clock signals.
13. The device according to claim 1 , wherein
the exposure period starts simultaneously on the plurality of rows.
14. The device according to claim 13 , wherein
the exposure period ends simultaneously on the plurality of rows.
15. The device according to claim 1 , wherein
the quenching circuit includes a quenching element implemented by a transistor having a gate for receiving the signal.
16. The device according to claim 1 , wherein
the quenching circuit includes a switch configured to be controlled with the signal and a resistance element coupled to the switch.
17. A system comprising:
the device according to claim 1 ; and
a processing unit configured to generate an image by using a signal outputted by the device.
18. A mobile object comprising:
the device according to claim 1 ; and
a control unit configured to control movement of the mobile object by using a signal outputted by the device.
19. An apparatus comprising:
the device according to claim 1 ; and
at least any of
an optical device corresponding to the device,
a control device configured to control the device,
a processing device configured to process a signal outputted by the device,
a display device configured to display information obtained by the device,
a storage device configured to store the information obtained by the device, and
a mechanical device configured to operate in accordance with the information obtained by the device.