TOUCH SENSIBLE ORGANIC LIGHT EMITTING DEVICE

• US 20100134426A1
• Filed: 04/10/2009
• Published: 06/03/2010
• Est. Priority Date: 11/28/2008
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: LEE, Dong-Ki, MIN, Hoon-Kee
• Granted Patent: US 9,292,118 B2
• Time in Patent Office: Days
• US Class Current: 345/173
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/04166 Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally G06F3/04184
• CPC Class Codes: G06F 3/0444 using a single conductive element covering the whole sensing surface, e.g. by sensing the electrical current flowing at the corners
• CPC Class Codes: G06F 3/045 using resistive elements, e.g. a single continuous surface or two parallel surfaces put in contact
• CPC Class Codes: G09G 3/3225 using an active matrix
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3266 Details of drivers for scan electrodes
• CPC Class Codes: G09G 3/3275 Details of drivers for data electrodes
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/40 OLEDs integrated with touch screens
• CPC Class Codes: H10K 59/873 Encapsulations

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.

Claims

1. An organic light emitting device comprising:

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, the plurality of encapsulation thin films 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.

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 transmitting 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 comprising a pressure applied to one terminal of the variable capacitor.

7. The organic light emitting device of claim 1, wherein

the touch sensor 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 receiving a changed voltage of the second transparent conductive layer according to a touch on the second insulating layer and generating a sensing signal.

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 receiving a 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 transmitting an output current to the organic light emitting element.