Display device

1 . A display device, comprising:

a display panel comprising a first display area comprising first sub-pixels to display an image, and a second display area comprising second sub-pixels and a transmission area adjacent to the second sub-pixels; and

an optical device overlapping the second display area of the display panel and configured to detect light incident through the transmission area,

wherein each of the first sub-pixels comprises a first light-emitting electrode, a second light-emitting electrode on the first light-emitting electrode, and a light-emitting layer between the first light-emitting electrode and the second light-emitting electrode, and

wherein each of the second sub-pixels comprises;

a first contact electrode;

a second contact electrode located apart from the first contact electrode;

a light-emitting element between the first contact electrode and the second contact electrode;

an insulating film below the light-emitting element;

a first alignment electrode at a layer below the insulating film; and

a second alignment electrode at the layer below the insulating film.

2 . The display device of claim 1 , wherein the display panel further comprises:

an encapsulation layer on the second light-emitting electrode;

a sensor-insulating film on the encapsulation layer; and

a sensor electrode on the sensor-insulating film.

3 . The display device of claim 2 , wherein each of the second sub-pixels further comprises a thin film transistor comprising a gate electrode, a source electrode, and a drain electrode,

wherein the first alignment electrode is electrically connected to the drain electrode of the thin film transistor and contacts the first contact electrode, and

wherein the second alignment electrode located is apart from the first alignment electrode and is configured to receive a first driving voltage.

4 . The display device of claim 3 , wherein the first alignment electrode and the second alignment electrode are on the sensor-insulating film.

5 . The display device of claim 3 , wherein the sensor electrode, the first alignment electrode, and the second alignment electrode comprise a same material.

6 . The display device of claim 1 , wherein the display panel comprises:

a second substrate on the second light-emitting electrode; and

a thin film transistor on the second substrate and comprising a gate electrode, a source electrode, and a drain electrode,

wherein the first alignment electrode is electrically connected to the source electrode or the drain electrode of the thin film transistor and contacts the first contact electrode, and

wherein the second alignment electrode is apart from the first alignment electrode and is configured to receive a first driving voltage.

7 . The display device of claim 6 , further comprising a sensor electrode located apart from the first contact electrode and the second contact electrode.

8 . The display device of claim 7 , wherein the display panel further comprises another insulating film covering the first contact electrode, and

wherein the second contact electrode and the sensor electrode are on the other insulating film.

9 . The display device of claim 7 , wherein the second contact electrode and the sensor electrode comprise a same material.

10 . The display device of claim 6 , wherein the display panel further comprises a filling layer between the second substrate and the second light-emitting electrode.

11 . The display device of claim 6 , wherein the display panel further comprises:

an encapsulation layer on the first contact electrode and the second contact electrode; and

a filling layer between the encapsulation layer and the second light-emitting electrode.

12 . The display device of claim 6 , wherein the display panel further comprises:

an encapsulation layer on the first contact electrode and the second contact electrode;

a wavelength conversion layer on the encapsulation layer; and

a color filter layer on the wavelength conversion layer.

13 . The display device of claim 1 , further comprising a circuit board on a surface of the display panel and mounted with the optical device.

14 . The display device of claim 1 , wherein the optical device is attached to a surface of the display panel.

15 . A display device, comprising:

a first substrate;

a first thin film transistor on the first substrate and comprising a first gate electrode, a first source electrode, and a first drain electrode;

a second thin film transistor on the first substrate and comprising a second gate electrode, a second source electrode, and a second drain electrode;

a first electrode electrically connected to the first source electrode or the first drain electrode of the first thin film transistor;

a light-emitting layer on the first electrode;

a second electrode on the light-emitting layer;

an encapsulation layer on the second electrode;

a sensor electrode on the encapsulation layer;

an insulating film below the encapsulation layer;

a first alignment electrode at a layer below the insulating film and electrically connected to the second source electrode or the second drain electrode of the second thin film transistor;

a second alignment electrode at the layer below the insulating film; and

a light-emitting element above the insulating film and electrically connected to the first alignment electrode,

wherein the sensor electrode and the first alignment electrode comprise a same material.