Detection device
A detection device includes a sensor area provided with a plurality of detection elements each comprising a photoelectric conversion element in a detection area, and a detector configured to detect a potential difference between a voltage generated in a first detection element and a voltage generated in a second detection element adjacent to the first detection element in the detection area.
1. A detection device comprising:
a sensor area provided with a plurality of detection elements each comprising a photoelectric conversion element in a detection area; and
a detector configured to detect a potential difference between a voltage generated in a first detection element and a voltage generated in a second detection element adjacent to the first detection element in the detection area, wherein
the detection elements are arranged in a matrix having a row-column configuration in a first direction and a second direction different from the first direction in the detection area, and
the detector is configured to detect the potential difference between the voltage generated in the first detection element and the voltage generated in the second detection element adjacent in the second direction to the first detection element in the detection area.
2. The detection device according to claim 1 , further comprising:
a read control scan line configured to supply a read control signal to the detection elements arranged in the first direction;
a drive circuit configured to sequentially select the read control scan lines along the second direction; and
an output signal line configured to be supplied with voltages generated in the detection elements arranged in the second direction, wherein
the detector is electrically coupled to the output signal line.
3. The detection device according to claim 2 , wherein
the detector comprises:
a differential amplifier circuit configured to output a potential difference between voltages generated in the detection elements adjacent in the second direction;
a first capacitive element coupled to a non-inverting input terminal of the differential amplifier circuit;
a second capacitive element coupled to an inverting input terminal of the differential amplifier circuit; and
a switch circuit configured to electrically couple the output signal line to the non-inverting input terminal or the inverting input terminal of the differential amplifier circuit by switching between the non-inverting input terminal and the inverting input terminal in synchronization with selective switching of the read control scan line.
4. The detection device according to claim 3 , wherein the differential amplifier circuit is configured to output a potential difference between a voltage that has charged the first capacitive element and a voltage that has charged the second capacitive element.
5. The detection device according to claim 3 , wherein
in the sensor area, N of the detection elements are arranged in the second direction in the detection area, and
the detector is configured to invert a sign of an (n+1)th output value of the differential amplifier circuit with respect to an nth output value (where n is a natural number of N or smaller) of the differential amplifier circuit.
6. The detection device according to claim 5 , further comprising a signal line selection circuit configured to simultaneously select more than one of all the output signal lines in the detection area, and electrically couple the selected output signal lines to the detector, wherein
the detector is provided with one of the differential amplifier circuits for the output signal lines simultaneously selected by the signal line selection circuit.
7. The detection device according to claim 6 , wherein
the signal line selection circuit is configured to sequentially select the output signal lines to be electrically coupled to the differential amplifier circuit along the first direction in a selection period of the read control scan line, and
the differential amplifier circuit is configured to:
be coupled, through the non-inverting input terminal, parallelly to the first capacitive elements correspondingly to the respective output signal lines sequentially selected in the selection period of the read control scan line; and
be coupled, through the inverting input terminal, parallelly to the second capacitive elements correspondingly to the respective output signal lines sequentially selected in the selection period of the read control scan line.
8. The detection device according to claim 3 , wherein the differential amplifier circuit is configured to amplify and output the potential difference between the voltage generated in the first detection element and the voltage generated in the second detection element adjacent in the second direction to the first detection element in the detection area.
9. The detection device according to claim 1 , wherein
each of the detection elements comprises:
a reset transistor configured to apply a reset voltage to a cathode of the photoelectric conversion element;
a source follower transistor configured to output a signal corresponding to a voltage generated in the photoelectric conversion element; and
a read transistor configured to read the output signal of the source follower transistor.
10. A detection device comprising:
a sensor area provided with a plurality of detection elements each comprising a photoelectric conversion element in a detection area; and
a detector configured to detect a potential difference between a voltage generated in a first detection element and a voltage generated in a second detection element adjacent to the first detection element in the detection area, wherein
the detection elements are arranged in a matrix having a row-column configuration in a first direction and a second direction different from the first direction in the detection area, and
the detector is configured to detect the potential difference between the voltage generated in the first detection element and the voltage generated in the second detection element adjacent in the first direction to the first detection element in the detection area.
11. The detection device according to claim 10 , further comprising:
a read control scan line configured to supply a read control signal to the detection elements arranged in the first direction;
a drive circuit configured to sequentially select the read control scan lines along the second direction; and
an output signal line configured to be supplied with voltages generated in the detection elements arranged in the second direction, wherein
the detector is electrically coupled to the output signal line.
12. The detection device according to claim 11 , further comprising a signal line selection circuit configured to sequentially select more than one of all the output signal lines in the detection area along the first direction, and electrically couple the selected output signal lines to the detector in a selection period of the read control scan line, wherein
the detector comprises:
a differential amplifier circuit configured to output a potential difference between voltages generated in the detection elements adjacent in the first direction;
a first capacitive element coupled to a non-inverting input terminal of the differential amplifier circuit;
a second capacitive element coupled to an inverting input terminal of the differential amplifier circuit; and
a switch circuit configured to electrically couple the output signal line to the non-inverting input terminal or the inverting input terminal of the differential amplifier circuit by switching between the non-inverting input terminal and the inverting input terminal in synchronization with selective switching of the output signal lines.
13. The detection device according to claim 12 , wherein the differential amplifier circuit is configured to output a potential difference between a voltage that has charged the first capacitive element and a voltage that has charged the second capacitive element.
14. The detection device according to claim 12 , wherein
in the sensor area, M of the detection elements are arranged in the first direction in the detection area, and
the detector is configured to invert a sign of an (m+1)th output value of the differential amplifier circuit with respect to an mth output value (where m is a natural number of M or smaller) of the differential amplifier circuit.
15. The detection device according to claim 12 , wherein the detector is provided with one of the differential amplifier circuits for the output signal lines sequentially selected by the signal line selection circuit.
16. The detection device according to claim 12 , wherein the differential amplifier circuit is configured to amplify and output the potential difference between the voltage generated in the first detection element and the voltage generated in the second detection element adjacent in the first direction to the first detection element in the detection area.