Organic light emitting device having touch sensor disposed thereon

1. An organic light emitting device comprising:

a substrate;

a thin film transistor disposed on a first surface of the substrate;

an organic light emitting element connected to the thin film transistor and configured to receive a data voltage;

a plurality of encapsulation thin films disposed on the organic light emitting element and encapsulating the organic light emitting element, wherein the plurality of encapsulation thin films include

a first portion overlapping the organic light emitting element in a direction perpendicular to the first surface of the substrate and a second portion connected to the first portion and including the same encapsulation thin films as the first portion, wherein a maximum distance between an upper surface of the first portion and the first surface of the substrate is less than a maximum distance between an upper surface of the second portion and the first surface of the substrate;

a planarization layer disposed on the plurality of encapsulation thin films, wherein a maximum thickness of the planarization layer corresponding to the first portion is greater than a maximum thickness of the planarization layer corresponding to the second portion; and

a touch conductive layer disposed on a planar surface of the planarization layer.

2. The organic light emitting device of claim 1 , wherein the plurality of encapsulation thin films comprises an organic insulator or an inorganic insulator.

3. The organic light emitting device of claim 2 , wherein the inorganic insulator comprises silicon oxide or silicon nitride.

4. The organic light emitting device of claim 1 , wherein the planarization layer comprises an organic material and has a flat surface.

5. The organic light emitting device of claim 1 , wherein the touch sensor comprises:

a variable capacitor connected to a sensing signal line, the sensing signal line configured to transmit a sensing signal; and

a reference capacitor connected between the sensing signal line and a reference voltage terminal.

6. The organic light emitting device of claim 5 , wherein a capacitance of the variable capacitor is changed according to an external touch input comprising a pressure applied to one terminal of the variable capacitor.

7. The organic light emitting device of claim 1 , wherein the conductive layer comprises a first transparent conductive layer.

8. The organic light emitting device of claim 7 , wherein the first transparent conductive layer comprises indium tin oxide (ITO) or indium zinc oxide (IZO).

9. The organic light emitting device of claim 7 , further comprising

a plurality of electrode island portions each disposed on a corner of the substrate, the plurality of electrode island portions transmitting a voltage to the first transparent conductive layer.

10. The organic light emitting device of claim 9 , further comprising:

a signal line pattern connecting the plurality of electrode island portions; and

a sensing signal processor connected to the signal line pattern, the sensing signal processor receiving a changed voltage according to a touch on the first transparent conductive layer and generating a digital sensing signal.

11. The organic light emitting device of claim 7 , further comprising:

a plurality of electrode island portions each disposed on the corner of the substrate and transmitting a high-frequency signal to the first transparent conductive layer;

a signal line pattern connecting the plurality of electrode island portions; and

a sensing signal processor connected to the signal line pattern, the sensing signal processor receiving a changed high-frequency signal according to a touch on the first transparent conductive layer and generating a sensing signal.

12. The organic light emitting device of claim 7 , wherein the touch sensor further comprises:

a first insulating layer disposed on the first transparent conductive layer; and

a second transparent conductive layer disposed on the first insulating layer.

13. The organic light emitting device of claim 12 , further comprising:

a plurality of electrode island portions each disposed on a corner of the substrate and transmitting a voltage to the first and second transparent conductive layers;

a signal line pattern connecting the plurality of electrode island portions; and

a sensing signal processor connected to the signal line pattern, the sensing signal processor receiving a changed voltage according to a touch on the second transparent conductive layer and generating a sensing signal.

14. The organic light emitting device of claim 12 , further comprising:

a plurality of electrode island portions each disposed on a corner of the substrate and transmitting a high-frequency signal to the first and second transparent conductive layers;

a signal line pattern connecting the plurality of electrode island portions; and

a sensing signal processor connected to the signal line pattern, the sensing signal processor receiving a changed high-frequency signal according to a touch on the second transparent conductive layer and generating a sensing signal.

15. The organic light emitting device of claim 12 , further comprising:

a second insulating layer disposed on the second transparent conductive layer.

16. The organic light emitting device of claim 15 , wherein the first transparent conductive layer is connected to the reference voltage terminal, and the second transparent conductive layer is connected to a sensing signal line disposed on the substrate.

17. The organic light emitting device of claim 16 , further comprising:

a sensing signal processor configured to receive a changed voltage of the second transparent conductive layer based on a touch input to the second insulating layer, and to generate a sensing signal based on the changed voltage.

18. The organic light emitting device of claim 1 , wherein the organic light emitting element comprises:

a pixel electrode connected to the thin film transistor and configured to receive a the data voltage through the thin film transistor;

an organic light emitting member disposed on the pixel electrode; and

a common electrode disposed on the organic light emitting member.

19. The organic light emitting device of claim 1 , wherein the thin film transistor comprises:

a switching transistor controlled by a scanning signal; and

a driving transistor connected to the switching transistor and configured to transmit an output current to the organic light emitting element.