Detection device

1. A detection device comprising:

an insulating substrate;

a detection element including

a first photodiode, and

a plurality of thin film transistors including a first thin film transistor,

a second thin film transistor, and

a third thin film transistor;

a dummy element including

a second photodiode and

a single thin film transistor that is a first thin film transistor; and

a first scan line,

wherein

the first scan line is a gate of the first thin film transistor of the detection element and a gate of the first thin film transistor of the dummy element,

the dummy element is located adjacent to the detection element,

in the detection element, the first thin film transistor is connected to the first photodiode through the second thin film transistor and the third thin film transistor, and

in the dummy element, the first thin film transistor is directly connected to the second photodiode.

2. The detection device of claim 1 , wherein,

in the detection element, a cathode of the first photodiode is electrically connected to a drain of the first thin film transistor and a gate of the second thin film transistor, and

in the detection element, a drain of the second thin film transistor is electrically connected to a source of the third thin film transistor.

3. The detection device of claim 2 , wherein,

in the dummy element, a cathode of the second photodiode is electrically connected to the drain of the first thin film transistor, and

in the dummy element, the cathode of the second photodiode is not electrically connected to the second thin film transistor.

4. The detection device of claim 3 , wherein the insulating substrate is a glass substrate.

5. The detection device of claim 2 , wherein,

in the detection element, the first photodiode overlaps the second thin film transistor and the third thin film transistor, in a plan view, and

in the dummy element, the second photodiode overlaps none of the second thin film transistor and the third thin film transistor, in the plan view.

6. The detection device of claim 5 , wherein the insulating substrate is a glass substrate.

7. The detection device of claim 6 , further comprise a coupling wiring, wherein

the coupling wiring is connected to an anode of the first photodiode and an anode of the second photodiode, and

a reference potential is applied to the anode of the first photodiode and the anode of the second photodiode.

8. The detection device of claim 3 , further comprise a first signal line intersecting the first scan line, wherein

the first signal line is connected to a source of the first thin film transistor in the detection element and a source of the second thin film transistor in the dummy element.

9. The detection device of claim 8 , further comprises a second signal line extends in parallel to the first signal line, wherein

the second signal line is connected to a source of the second thin film transistor in the detection element, and

the second signal line crosses a semiconductor of the first thin film transistor in the detection element and a semiconductor of the first thin film transistor in the dummy element.

10. The detection device of claim 8 , further comprises an output signal line extends in parallel to the first signal line and the second signal line,

wherein

in the detection element, the output signal line is connected to a drain of the third thin film transistor, and

in dummy element, the second photodiode is not electrically connected to the output signal line.

11. A detection device comprising:

a glass substrate;

a detection element including

a first photodiode and

a plurality of thin film transistors;

a dummy element including

a second photodiode and

a single thin film transistor; and

a first scan line,

wherein

in the dummy element, the single thin film transistor is a reset transistor,

in the detection element, the thin film transistors include a reset transistor, and

the first scan line is a gate of the reset transistor of the detection element and a gate of the reset transistor of the dummy element.

12. The detection device of claim 11 , wherein,

in the detection element, the thin film transistors further include a source follower transistor and a read transistor,

in the detection element, a cathode of the first photodiode is electrically connected to a drain of the reset transistor and a gate of the source follower transistor, and

in the detection element, a drain of the source follower transistor is electrically connected to a source of the read transistor.

13. The detection device of claim 12 , wherein,

in the dummy element, a cathode of the second photodiode is electrically connected only to the drain of the reset transistor.