Display device

1 . A display device, comprising:

a substrate;

a pixel anode electrode on the substrate;

a bank disposed on the pixel anode electrode and configured to have an opening exposing a portion of a top of the pixel anode electrode;

an emission layer disposed in the opening of the bank and configured to overlap with the pixel anode electrode;

a pixel cathode electrode configured to overlap with the emission layer;

an encapsulation layer configured to cover the pixel cathode electrode;

a touch buffer layer disposed on the encapsulation layer,

a touch sensor on the touch buffer layer; and

an optical sensor on the substrate,

wherein the encapsulation layer includes a first inorganic encapsulation layer, a second inorganic encapsulation layer, and an organic encapsulation layer disposed between the first inorganic encapsulation layer and the second inorganic encapsulation layer,

wherein the touch sensor vertically overlaps with the bank and does not vertically overlap with the opening,

wherein the touch buffer layer is disposed to contact with the second inorganic encapsulation layer, and

wherein the optical sensor comprises:

an optical sensor cathode electrode disposed over the substrate,

an optical sensor intermediate layer configured to overlap with the pixel cathode electrode, and

an optical sensor anode electrode that is either electrically connected to a touch sensor metal of the touch sensor or is a single, integrally formed electrode that is the same as the pixel anode electrode.

2 . The display device of claim 1 , further comprising a contact hole disposed between the touch sensor and the optical sensor anode electrode,

wherein the optical sensor anode electrode contacts the touch sensor through the contact hole;

a protective layer configured to cover the touch sensor; and

an optical sensor protective layer configured to cover the optical sensor.

3 . The display device of claim 1 , wherein the touch sensor comprises a first touch sensor pattern and a second touch sensor pattern configured to intersect the first touch sensor pattern, and

wherein the optical sensor is configured to overlap with an area where the first touch sensor pattern and the second touch sensor pattern intersect; and

wherein the optical sensor cathode electrode comprises a first optical sensor cathode electrode pattern configured to overlap with the first touch sensor pattern, and a second optical sensor cathode electrode pattern configured to overlap with the second touch sensor pattern.

4 . The display device of claim 3 , wherein the optical sensor cathode electrode is configured to overlap with a first optical sensor anode electrode, which is the optical sensor anode electrode, and a second optical sensor anode electrode different from the first optical sensor anode electrode.

5 . The display device of claim 1 , wherein the optical sensor anode electrode is on the optical sensor cathode electrode, and

wherein the optical sensor anode electrode is configured to overlap with the emission layer.

6 . The display device of claim 1 , wherein the optical sensor anode electrode is configured not to overlap with the touch sensor from a plan view.

7 . The display device of claim 1 , wherein the optical sensor anode electrode extends in one direction and is configured to overlap with the touch sensor from a plan view, and

wherein the optical sensor is configured to overlap with the touch sensor from a plan view.

8 . The display device of claim 7 , further comprising a bank configured to correspond to an area other than a light emitting area corresponding to the emission layer,

wherein the bank is disposed between the optical sensor and the touch sensor, and

wherein the optical sensor anode electrode extending in the one direction is disposed adjacent to a top surface of the optical sensor intermediate layer.

9 . The display device of claim 1 , wherein the optical sensor intermediate layer comprises an organic material, and the organic material comprises a compound of poly (3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-phenyl C61-butyric acid methylester (PCBM).

10 . The display device of claim 1 , wherein a period during which the current is supplied to the pixel anode electrode comprises:

a first period during which a first current for causing the emission layer to emit light is supplied to the pixel anode electrode, and

a second period during which the current generated by the optical sensor based on the light coming from outside of the display device is supplied to the pixel anode electrode, and

wherein the first period and the second period alternate at a selected rate.

11 . A display device, comprising:

a substrate;

a light emitting element on the substrate, the light emitting element including a first pixel electrode, a second pixel electrode, and an emission layer between the first pixel electrode and the second pixel electrode;

an encapsulation layer on the light emitting element;

a touch sensor including a touch sensor metal on the encapsulation layer; and

an optical sensor on the substrate, the optical sensor including a first optical sensor electrode, a second optical sensor electrode, and an optical sensor intermediate layer between the first optical sensor electrode and the second optical sensor electrode,

wherein the first optical sensor electrode is electrically connected to a touch sensor metal of the touch sensor through a contact hole of a protective layer disposed on the touch sensor.

12 . The display device of claim 11 , wherein the optical sensor overlaps with the touch sensor metal of the touch sensor from a plan view.

13 . The display device of claim 11 , further comprising a first bank and a second bank facing and opposite of the first bank,

wherein the light emitting element is between the first bank and the second bank.

14 . The display device of claim 13 , wherein the optical sensor is between the first bank and the second bank from a plan view, and

wherein the light emitting element overlaps the optical sensor from a plan view.

15 . The display device of claim 13 , wherein the second pixel electrode of the light emitting is on the first pixel electrode of the light emitting element,

wherein the second optical sensor electrode of the optical sensor is on the first optical sensor electrode of the optical sensor, and

wherein the first pixel electrode of the light emitting element and the second optical sensor electrode of the optical sensor are distinct and separate structures from each other.

16 . The display device of claim 15 , wherein the optical sensor overlaps with either the first bank or the second bank, and

wherein the optical sensor does not overlap with the light emitting element from a plan view.

17 . The display device of claim 13 , wherein the second pixel electrode of the light emitting element is on the first pixel electrode of the light emitting element, and

wherein the second optical sensor electrode of the optical sensor is on the first optical sensor electrode of the optical sensor.

18 . The display device of claim 17 , wherein either the optical sensor intermediate layer or the first optical sensor electrode does not overlap with the light emitting element from a plan view.