A display device comprising: a display module including a light emitting element (OLED) to generate light, and a display panel to display an image using the light; and a detection module disposed under the display module to receive an external signal and including a detection area that substantially detects biometric authentication information and a non-detection area provided around the detection area, wherein the detection module comprises: a substrate; a detector disposed on the substrate to detect the external signal and including a first light detection electrode, a second light detection electrode, and a light detection layer between the first and second light detection electrodes (E1, E2); a sensor driving circuit disposed on the substrate to drive the detector; and a light shielding layer to block an external light from entering the sensor driving circuit and to receive a light blocking voltage (V BL), wherein the light shielding layer is provided in a size corresponding to the detection area, wherein the sensor driving circuit comprises at least one transistor (TR_T), wherein the detector is disposed on an insulating layer covering an input electrode and an output electrode of the at least one transistor (TR_T), wherein one of the first and second light detection electrode (E1, E2) is connected to the output electrode through the insulating layer, and wherein the light shielding layer is disposed below the detector and overlaps the at least one transistor (TR_T) and the detector. a display module including a light emitting element (OLED) to generate light, and a display panel to display an image using the light; and a detection module disposed under the display module to receive an external signal and including a detection area that substantially detects biometric authentication information and a non-detection area provided around the detection area, wherein the detection module comprises: a substrate; a detector disposed on the substrate to detect the external signal and including a first light detection electrode, a second light detection electrode, and a light detection layer between the first and second light detection electrodes (E1, E2); a sensor driving circuit disposed on the substrate to drive the detector; and a light shielding layer to block an external light from entering the sensor driving circuit and to receive a light blocking voltage (V BL), wherein the light shielding layer is provided in a size corresponding to the detection area, wherein the sensor driving circuit comprises at least one transistor (TR_T), wherein the detector is disposed on an insulating layer covering an input electrode and an output electrode of the at least one transistor (TR_T), wherein one of the first and second light detection electrode (E1, E2) is connected to the output electrode through the insulating layer, and wherein the light shielding layer is disposed below the detector and overlaps the at least one transistor (TR_T) and the detector. a substrate; a detector disposed on the substrate to detect the external signal and including a first light detection electrode, a second light detection electrode, and a light detection layer between the first and second light detection electrodes (E1, E2); a sensor driving circuit disposed on the substrate to drive the detector; and a light shielding layer to block an external light from entering the sensor driving circuit and to receive a light blocking voltage (V BL), wherein the light shielding layer is provided in a size corresponding to the detection area, wherein the sensor driving circuit comprises at least one transistor (TR_T), wherein the detector is disposed on an insulating layer covering an input electrode and an output electrode of the at least one transistor (TR_T), wherein one of the first and second light detection electrode (E1, E2) is connected to the output electrode through the insulating layer, and wherein the light shielding layer is disposed below the detector and overlaps the at least one transistor (TR_T) and the detector.