Display device with photo detector

1 . A display device comprising:

a substrate including a first display area and a second display area adjacent to the first display area;

a plurality of first pixels in the first display area on the substrate;

a plurality of second pixels in the second display area on the substrate;

a pixel driving circuit in each of the plurality of first pixels and each of the plurality of second pixels on the substrate;

a plurality of sub-pixels in each of the plurality of first pixels and each of the plurality of second pixels on the pixel driving circuit; and

a sensing unit in each of the plurality of second pixels on the pixel driving circuit;

an insulating layer on the pixel driving circuit; and

a plurality of banks in the plurality of sub-pixels and the sensing unit on the insulating layer,

wherein each of the plurality of sub-pixels includes a light emitting device and the sensing unit includes a photo detector,

wherein the light emitting device is a micro light emitting diode (LED), and

wherein the light emitting device and the photo detector are on the plurality of banks.

2 . The display device of claim 1 , wherein the sensing unit is at one side of any one of the plurality of sub-pixels in each of the plurality of second pixels and the light emitting device and the photo detector are on a same plane.

3 . The display device of claim 2 , further comprising:

a first electrode on the plurality of banks and a second electrode on the first electrode,

wherein the first electrode supplies a first voltage applied from the pixel driving circuit to an anode of the light emitting device and an anode of the photo detector, and the second electrode supplies a second voltage applied from the pixel driving circuit to a cathode of the light emitting device and a cathode of the photo detector.

4 . The display device of claim 3 , wherein the light emitting device includes the anode on a bank from the plurality of banks, a first semiconductor layer on the anode, and a second semiconductor layer on the first semiconductor layer,

wherein the photo detector includes the anode on the bank, a third semiconductor layer on the anode, and a fourth semiconductor layer on the third semiconductor layer,

wherein the first semiconductor layer and the fourth semiconductor layer are semiconductor layers doped with impurities of any one of n-type or p-type, and

wherein the second semiconductor layer and the third semiconductor layer are semiconductor layers doped with impurities of another of the n-type and the p-type.

5 . The display device of claim 1 , wherein the plurality of sub-pixels are on the sensing unit in each of the plurality of second pixels and the light emitting device and the photo detector are on different layers from each other.

6 . The display device of claim 5 , wherein the plurality of banks include a first plurality of banks on the insulating layer and a second plurality of banks on the first plurality of banks, and

wherein the photo detector is on the first plurality of banks and the light emitting device is on the second plurality of banks.

7 . The display device of claim 6 , wherein a number of light emitting devices and a number of photo detectors are a same in each of the plurality of second pixels.

8 . The display device of claim 6 , wherein each of the plurality of second pixels includes a first sub-pixel and a second sub-pixel adjacent to the first sub-pixel,

wherein the first sub-pixel includes:

a first photo detector; and

a first light emitting device on the first photo detector and overlapping the first photo detector; and

wherein the first sub-pixel includes:

a second photo detector; and

a second light emitting device on the second photo detector and overlapping the second photo detector.

9 . The display device of claim 6 , further comprising:

a first optical layer on the insulating layer, the first optical layer including:

a first lower optical layer covering a side surface of the photo detector and a side surface of the first plurality of banks;

a first central optical layer between the first lower optical layer and the second plurality of banks; and

a first upper optical layer covering a side surface of the light emitting device and a side surface of the second plurality of banks.

10 . The display device of claim 9 , further comprising:

a first electrode between the insulating layer and the first lower optical layer;

a second electrode between the first lower optical layer and the first central optical layer;

a third electrode between the first central optical layer and the first upper optical layer; and

a fourth electrode on the first upper optical layer.

11 . The display device of claim 10 , wherein the first electrode supplies a first voltage applied from the pixel driving circuit to an anode of the photo detector,

wherein the second electrode supplies a second voltage applied from the pixel driving circuit to a cathode of the photo detector,

wherein the third electrode supplies a third voltage applied from the pixel driving circuit to an anode of the light emitting device, and

wherein the fourth electrode supplies a fourth voltage applied from the pixel driving circuit to a cathode of the light emitting device.

12 . The display device of claim 11 , wherein the first voltage and the third voltage are a same and the second voltage and the fourth voltage are a same,

wherein the light emitting device includes the anode on a bank from the plurality of banks, a first semiconductor layer on the anode, and a second semiconductor layer on the first semiconductor layer,

wherein the photo detector includes the anode on the bank, a third semiconductor layer on the anode, and a fourth semiconductor layer on the third semiconductor layer,

wherein the first semiconductor layer and the fourth semiconductor layer are semiconductor layers doped with impurities of any one of n-type or p-type, and

wherein the second semiconductor layer and the third semiconductor layer are semiconductor layers doped with impurities of another of the n-type and the p-type.

13 . The display device of claim 1 , wherein the second display area is a central area of the substrate and the first display area is an area surrounding the second display area.

14 . The display device of claim 1 , wherein the photo detector absorbs any one of red light, green light, or blue light.