Detection device
A detection device includes a plurality of detection elements arranged in a matrix having a row-column configuration in a detection region, a plurality of scan lines coupled to the detection elements arranged in a first direction, a plurality of output signal lines that are coupled to the detection elements arranged in a second direction different from the first direction, and to which the detection elements output detection signals, a detection circuit configured to be supplied with the detection signals through the output signal lines, and a control circuit configured to output at least selection signals for switching between selection and non-selection of the output signal lines to supply the detection signals to the detection circuit. The control circuit is configured to discharge an electric charge of each of the non-selected output signal lines different from the selected output signal lines.
1. A detection device comprising:
a plurality of detection elements arranged in a matrix having a row-column configuration in a detection region;
a plurality of scan lines coupled to the detection elements arranged in a first direction;
a plurality of output signal lines that are coupled to the detection elements arranged in a second direction different from the first direction, and to which the detection elements output detection signals;
a detection circuit configured to be supplied with the detection signals through the output signal lines;
a control circuit configured to output at least selection signals for switching between selection and non-selection of the output signal lines to supply the detection signals to the detection circuit;
a first signal line selection circuit configured to switch between the selection and the non-selection of the output signal lines to supply the detection signals to the detection circuit; and
a second signal line selection circuit configured to discharge an electric charge of each of the non-selected output signal lines different from the selected output signal lines, wherein
the control circuit is configured to control the second signal line selection circuit so as to conduct a predetermined constant current through each of the non-selected output signal lines when discharging the electric charge of the non-selected output signal line.
2. The detection device according to claim 1 , wherein
the scan lines comprise:
a plurality of reset control scan lines configured to supply reset control signals for applying a reset potential to the detection elements arranged in the first direction; and
a plurality of read control scan lines configured to supply read control signals for reading the detection signals from the detection elements arranged in the first direction.
3. The detection device according to claim 2 , wherein
each of the detection elements comprises:
a photoelectric conversion element configured to store a signal corresponding to irradiating light;
a reset transistor configured to apply the reset potential to a cathode of the photoelectric conversion element;
a source follower transistor configured to output a signal corresponding to a potential generated in the photoelectric conversion element; and
a read transistor configured to read an output signal of the source follower transistor, and output the detection signal.
4. The detection device according to claim 3 , wherein
a reset period to apply the reset potential to the cathode or an anode of the photoelectric conversion element,
a storage period to store the signal corresponding to the irradiating light in the photoelectric conversion element, and
a read period to output the detection signal are incorporated, and
the control circuit is configured to perform control so as to sequentially switch the selected output signal lines during the read period.
5. A detection device comprising:
detection elements arranged in a detection region;
a switch coupled to each of the detection elements;
a scan line that is coupled to the switch, and is configured to control opening and closing of the switch;
an output signal line coupled to the switch;
a detection circuit configured to be supplied with a detection signal from each of the detection elements through the output signal line; and
a first switching element coupled to the switch and the detection circuit;
a second switching element coupled to and disposed between the switch and a power supplying a predetermined reference potential, wherein
the detection circuit reads out the detection signal from the output signal line, in a read-out period in which each of the detection elements is electrically coupled to the output signal line by the switch and the first switching element is ON, and
the predetermined reference potential is applied to the output signal line through the second switching element, except during the read out period.
6. The detection device according to claim 5 , wherein
each of the detection elements comprises:
a photodetector; and
a metal-oxide semiconductor (MOS) transistor, and
a gate of the MOS transistor is coupled to the photodetector, and a source of the MOS transistor is coupled to the switch.