Organic light emitting device having touch sensor disposed thereon

Patent metadata

Field	Value
Publication number	US-9292118-B2
Application number	US-42164109-A
Country	US
Kind code	B2
Filing date	Apr 10, 2009
Priority date	Nov 28, 2008
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

Embodiments of the present invention generally relate to a touch sensible organic light emitting device. The organic light emitting device according to an exemplary embodiment of the present invention comprises: a substrate; a thin film transistor disposed on the substrate; an organic light emitting element connected to the thin film transistor and receiving a data voltage; a plurality of encapsulation thin films disposed on the organic light emitting element, and encapsulating the thin film transistor and the organic light emitting element; a planarization layer disposed on the encapsulation thin film; and a touch sensor disposed on the planarization layer.

First claim

What is claimed is:

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.

Assignees

• Lee Dong-Ki
• Min Hoon-Kee
• Samsung Display Co Ltd

Inventors

• Lee Dong-Ki
• Min Hoon-Kee

Classifications

• H10K50/844

  Encapsulations · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K59/40 Primary

  OLEDs integrated with touch screens · CPC title

• G06F3/045 Primary

  using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact · CPC title