ORGANIC LIGHT EMITTING DIODE DISPLAY

• US 20130320314A1
• Filed: 04/03/2013
• Published: 12/05/2013
• Est. Priority Date: 06/01/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Kim, Ki-Wook, Noh, Dae-Hyun
• Granted Patent: US 9,070,896 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: H10K 50/80 Constructional details
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]

Abstract

An OLED display includes: a substrate; a first signal line provided on the substrate; a second signal line crossing the first signal line; a thin film transistor connected to the first signal line and the second signal line; a pixel electrode connected to a drain electrode of the thin film transistor; an emission layer formed on the pixel electrode; a common electrode formed on the emission layer and formed of a reflective material; and a capacitor overlapping the pixel electrode.

Claims

1. An organic light emitting diode (OLED) display, comprising:

a substrate;

a first signal line provided on the substrate;

a second signal line crossing the first signal line;

a thin film transistor connected to the first signal line and the second signal line;

a pixel electrode connected to a drain electrode of the thin film transistor;

an emission layer formed on the pixel electrode;

a common electrode formed on the emission layer and comprising a reflective material; and

a capacitor overlapping the pixel electrode.

2. The OLED display of claim 1, wherein the capacitor comprises a first capacitor electrode and a second capacitor electrode that overlap each other with reference to a dielectric material;

and

wherein at least one of the first capacitor electrode and the second capacitor electrode is formed of a transparent conductive material.

3. The OLED display of claim 2, wherein the pixel electrode is formed of a transparent conductive material.

4. The OLED display of claim 2, wherein the first capacitor electrode is connected to a semiconductor of the thin film transistor, and the second capacitor electrode is connected to a gate electrode of the thin film transistor.

5. An organic light emitting diode (OLED) display comprising a plurality of pixels, wherein each pixel includes:

a capacitor connected to a thin film transistor; and

an emission unit controlled by the thin film transistor;

wherein the emission unit comprises a plurality of sub-emission units.

6. The OLED display of claim 5, wherein at least one of the plurality of sub-emission units is provided in the capacitor.

7. The OLED display of claim 6, wherein each of the plurality of sub-emission units comprises:

a pixel electrode;

an emission layer formed on the pixel electrode; and

a common electrode formed on the emission layer.

8. The OLED display of claim 7, wherein the capacitor comprises a first capacitor electrode and a second capacitor electrode that overlap each other with reference to a dielectric material, and wherein the pixel electrode provided in the capacitor is disposed within a boundary line of the capacitor.

9. The OLED display of claim 8, wherein at least one of the first capacitor electrode and the second capacitor electrode is formed of a transparent conductive material.

10. The OLED display of claim 9, wherein the first capacitor electrode is formed of a same material as a semiconductor of a thin film transistor.

11. The OLED display of claim 7, wherein the pixel electrode is formed of a transparent material and the common electrode is formed of a reflective material.

12. The OLED display of claim 5, further comprising a semi-transparent layer overlapping at least one pixel electrode.

13. An organic light emitting diode (OLED) display, comprising:

a substrate;

a first signal line provided on the substrate;

a second signal line crossing the first signal line;

a thin film transistor connected to the first signal line and the second signal line;

a first pixel electrode electrically connected to the thin film transistor;

a second pixel electrode electrically connected to the first pixel electrode;

an emission layer formed on the first pixel electrode and the second pixel electrode; and

a common electrode formed on the emission layer.

14. The OLED display of claim 13, further comprising a capacitor electrically connected to the thin film transistor;

wherein the second pixel electrode is provided on the capacitor.

15. The OLED display of claim 14, wherein the second pixel electrode is disposed within a boundary line of one of the first capacitor electrode and the second capacitor electrode.

16. The OLED display of claim 15, wherein the first capacitor electrode is connected to a semiconductor of the thin film transistor, and the second capacitor electrode is connected to a gate electrode of the thin film transistor.

17. The OLED display of claim 16, wherein the second capacitor electrode is formed of a transparent conductive material.

18. The OLED display of claim 13, wherein the first pixel electrode and the second pixel electrode are formed of a transparent conductive material.

19. The OLED display of claim 18, wherein the first pixel electrode and the second pixel electrode are connected to each other through a contact hole.

20. The OLED display of claim 19, wherein the first pixel electrode is provided in a same layer as a gate electrode of the thin film transistor is provided.

21. The OLED display of claim 18, wherein the first pixel electrode and the second pixel electrode are provided in a same layer.

22. The OLED display of claim 21, further comprising a semi-transparent layer provided between the first pixel electrode and the substrate.

23. The OLED display of claim 13, wherein the common electrode is formed of a reflective material.