Fingerprint sensor and display device including the same

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 a first opening portion;
• a light emitting element layer disposed on the circuit element layer, the light emitting element layer including a light emitting element;
• a sensor layer disposed on a second surface of the substrate, the sensor layer including a light sensor corresponding to the first opening portion;
• and
• a light blocking layer disposed between the substrate and the sensor layer and including a second opening portion corresponding to the first opening portion,
• wherein:
• the first opening portion is defined as a closed loop by non-overlapping of the semiconductor layer and the conductive layers in plan view;
• and
• in plan view, an area of the second opening portion is larger than an area of the first opening portion.