Fingerprint sensor and display device including the same

1. A fingerprint sensor comprising:

a substrate;

a circuit element layer disposed on a first surface of the substrate, the circuit element layer including a semiconductor layer, conductive layers, and at least one opening portion;

a light emitting element layer disposed on the circuit element layer, the light emitting element layer including at least one light emitting element; and

a sensor layer disposed on a second surface of the substrate, the sensor layer including at least one light sensor corresponding to the opening portion,

wherein the opening portion is defined by non-overlapping of the semiconductor layer and the conductive layers,

wherein the opening portion has a closed loop shape in plan view, and

wherein at least a portion of the closed loop shape includes a curve, or an internal angle of the at least a portion of the closed loop shape is an obtuse angle.

2. The fingerprint sensor according to claim 1 , wherein the conductive layers comprises:

a first conductive layer including first electrodes extending in a first direction;

a second conductive layer disposed on the first conductive layer, the second conductive layer including second electrodes extending in the first direction; and

a third conductive layer disposed on the second conductive layer, the third conductive layer including third electrodes extending in a second direction perpendicular to the first direction, and

wherein the opening portion is positioned between the first electrodes, between the second electrodes, and between the third electrodes in plan view.

3. The fingerprint sensor according to claim 2 , wherein the first electrodes include a first wire extending in the first direction,

wherein the second electrodes include a second wire spaced apart from the first wire in plan view by a preset distance, the second wire extending in the first direction,

wherein the third electrodes include a third wire extending in the second direction and a bridge pattern spaced apart from the third wire, and

wherein the opening portion is defined by a portion of the first wire, a portion of the second wire, a portion of the third wire, and a portion of the bridge pattern.

4. The fingerprint sensor according to claim 3 , wherein the third wire includes at least two first protrusion portions protruding toward the bridge pattern in plan view, and

wherein the at least a portion of the closed loop shape is defined by the at least two first protrusion portions.

5. The fingerprint sensor according to claim 4 , wherein the first protrusion portions partially overlap the first wire and the second wire, respectively.

6. The fingerprint sensor according to claim 5 , wherein the internal angle of the closed loop shape corresponding to each of the first protrusion portions is an obtuse angle.

7. The fingerprint sensor according to claim 6 , wherein one side of each of the first protrusion portions extends in a direction crossing each of the first direction and the second direction.

8. The fingerprint sensor according to claim 7 , wherein at least one of the first protrusion portions has a trapezoidal planar shape.

9. The fingerprint sensor according to claim 4 , wherein the second wire includes at least one second protrusion portion protruding toward the first wire in plan view,

wherein the second protrusion portion does not overlap the third wire, and

wherein the first and second protrusion portions correspond to the at least a portion of the closed loop shape.

10. The fingerprint sensor according to claim 9 , wherein the bridge pattern includes at least one third protrusion portion protruding toward the third wire in plan view,

wherein the third protrusion portion overlaps the first wire, and

wherein the first to third protrusion portions correspond to the at least a portion of the closed loop shape.

11. The fingerprint sensor according to claim 10 , wherein the opening portion has an octagonal planar shape.

12. The fingerprint sensor according to claim 3 , wherein the first wire includes at least one fourth protrusion portion protruding in the second direction, and

wherein the fourth protrusion portion includes a curve portion corresponding to the curve of the closed loop shape.

13. The fingerprint sensor according to claim 12 , wherein the second wire includes a fifth protrusion portion protruding in a direction opposite to the second direction, and

wherein the fifth protrusion portion includes a curve portion that faces the fourth protrusion portion and corresponds to the curve of the closed loop shape.

14. The fingerprint sensor according to claim 13 , wherein the opening portion has a planar shape of a circle or an ellipse.

15. The fingerprint sensor according to claim 3 , wherein the third wire includes at least two groove portions,

wherein the groove portions partially overlap the first wire and the second wire, respectively, and

wherein the internal angle of the closed loop shape corresponding to the groove portions is an acute angle.

16. The fingerprint sensor according to claim 15 , wherein the second wire does not overlap the bridge pattern.

17. The fingerprint sensor according to claim 3 , wherein the semiconductor layer includes active patterns including each of a source electrode and a drain electrode, and

wherein the opening portion is further defined by a portion of the active patterns.

18. A display device comprising:

a substrate on which a pixel is disposed;

a circuit element layer disposed on a first surface of the substrate, the circuit element layer including conductive layers on which circuit elements of the pixel are disposed;

a light emitting element layer disposed on the circuit element layer, the light emitting element layer including at least one light emitting element configuring the pixel; and

a sensor layer disposed on a second surface of the substrate, the sensor layer including at least one light sensor,

wherein at least one opening portion having a closed loop shape in plan view is defined by non-overlapping of the conductive layers, and

wherein at least a portion of the closed loop shape includes a curve, or an internal angle of the at least a portion of the closed loop shape is an obtuse angle.

19. The display device according to claim 18 , wherein the conductive layers comprises:

a first conductive layer including a light emission control line extending in a first direction;

a second conductive layer disposed on the first conductive layer and spaced apart from the light emission control line at a preset distance in plan view, the second conductive layer including an initialization power line extending in the first direction; and

a third conductive layer disposed on the second conductive layer, the third conductive layer including a power line extending in a second direction perpendicular to the first direction and a bridge pattern spaced apart from the power line,

wherein the opening portion is defined by a portion of the light emission control line, a portion of the initialization power line, a portion of the power line, and a portion of the bridge pattern.

20. The display device according to claim 19 , wherein the initialization power line includes at least one second protrusion portion protruding toward the light emission control line in plan view,

wherein the power line includes at least two first protrusion portions protruding toward the bridge pattern in plan view,

wherein the bridge pattern includes at least one third protrusion portion protruding toward the power line in plan view, and

wherein the first to third protrusion portions configure the at least a portion of the closed loop shape.