Detection device

1. A detection device comprising:

a substrate having a sensor region; and

a plurality of photosensors arranged in a first direction and a second direction orthogonal to the first direction in the sensor region, wherein

the substrate comprises:

a plurality of read control scan lines extending in the first direction in the sensor region and configured to transmit read control signals; and

a plurality of output signal lines extending in the second direction in the sensor region,

the photosensors comprise:

a plurality of dummy elements comprising first photodiodes and arranged along a contour of the sensor region; and

a plurality of detection elements comprising second photodiodes and arranged on an inner side of a frame-like dummy region in which the dummy elements are arranged,

the dummy elements are coupled to neither the read control scan lines nor the output signal lines, and

the detection elements are coupled to the read control scan lines and the output signal lines and are configured to, after receiving the read control signals, output signals generated by the first photodiodes to the output signal lines.

2. The detection device according to claim 1 , wherein

the substrate comprises:

reset control scan lines configured to transmit reset control signals; and

reset signal lines configured to supply a reset potential, and

each of the detection elements and the dummy elements is coupled to a corresponding one of the reset control scan lines and a corresponding one of the reset signal lines and configured to, after receiving the reset control signal, use the reset potential to drive the first photodiode or the second photodiode in a reverse bias state.

3. The detection device according to claim 2 , wherein anodes of the first photodiodes and anodes of the second photodiodes are coupled to a reference potential on the substrate.

4. The detection device according to claim 3 , wherein

the detection elements each comprises a reset transistor, a read transistor, and a source follower transistor,

the reset signal lines are coupled to sources of the reset transistors,

the reset control scan lines are coupled to gates of the reset transistors,

drains of the reset transistors are coupled to gates of the source follower transistors,

cathodes of the second photodiodes are coupled to the gates of the source follower transistors,

drains of the source follower transistors are coupled to sources of the read transistors,

the read control scan lines are coupled to gates of the read transistors, and

the output signal lines are coupled to drains of the read transistors.

5. The detection device according to claim 4 , wherein

the dummy elements each comprises a reset transistor,

gates of the reset transistors of the dummy elements are coupled to the reset control scan lines,

sources of the reset transistors of the dummy elements are coupled to the reset signal lines, and

drains of the reset transistors of the dummy elements are coupled to cathodes of the first photodiodes.

6. The detection device according to claim 5 , wherein

the substrate further comprises power supply signal lines,

the power supply signal lines are coupled to sources of the source follower transistors of the detection elements, and

the dummy elements are not coupled to the power supply signal lines.