Organic light emitting diode display device and method of fabricating the same

Patent metadata

Field	Value
Publication number	US-9012900-B2
Application number	US-201313947531-A
Country	US
Kind code	B2
Filing date	Jul 22, 2013
Priority date	Dec 26, 2012
Publication date	Apr 21, 2015
Grant date	Apr 21, 2015

Abstract

An organic light emitting diode display device capable of improving capacitance Cst of a storage capacitor and transmittance and a method of fabricating the same are disclosed. The organic light emitting diode display device includes a driving thin film transistor (TFT) formed on the substrate, a passivation film formed to cover the TFT driver, a color filter formed on the passivation film in a luminescent region, a planarization film formed to cover the color filter, a transparent metal layer formed on the planarization film, an insulating film formed on the transparent metal layer, a first electrode connected to the TFT driver and overlapping the transparent metal layer while interposing the insulating film therebetween, an organic light emitting layer and a second electrode which are sequentially formed on the first electrode. The transparent metal layer, the insulating film, and the first electrode constitute a storage capacitor in the luminescent region.

First claim

What is claimed is:

1. An organic light emitting diode display device comprising:
a substrate having a luminescent region;
a thin film transistor driver on the substrate;
a passivation film to cover the thin film transistor driver;
a color filter on the passivation film in the luminescent region;
a planarization film to overlap the color filter;
a transparent metal layer on the planarization film to overlap the luminescent region;
an insulating film on the transparent metal layer;
a first electrode connected to the thin film transistor driver and overlapping the transparent metal layer, wherein the insulating film is interposed between the first electrode and the transparent metal layer to comprise a storage capacitor;
a bank layer having a bank hole that exposes a portion of the first electrode on the first electrode and the insulating film;
an organic light emitting layer on the first electrode and configured to emit light through the luminescent region; and
a second electrode on the organic light emitting layer,
wherein the organic light emitting layer in the luminescent region is fully overlapped with the first electrode and the transparent metal layer.

2. The organic light emitting diode display device according to claim 1 , wherein the thin film transistor driver is comprised of a gate electrode coupled to a double gate electrode on the passivation film.

3. The organic light emitting diode display device according to claim 2 , wherein the gate electrode is coupled the double gate electrode via a separate connection portion that is formed between the gate electrode and the double gate electrode.

4. The organic light emitting diode display device according to claim 2 , wherein the double gate electrode is comprised of a transparent conductive pattern and an opaque conductive pattern.

5. The organic light emitting diode display device according to claim 4 , wherein the transparent conductive pattern is formed on a same layer as the transparent metal layer, and the transparent conductive pattern is a same material as the transparent metal layer.

6. The organic light emitting diode display device according to claim 1 , further comprising a light blocking layer formed on the transparent metal layer to cover a portion of the planarization film.

7. The organic light emitting diode display device according to claim 1 , wherein the organic light emitting layer is configured to emit light via the luminescent region of the substrate after the light passes through the first electrode, the insulating film, and the transparent metal layer.

8. The organic light emitting diode display device according to claim 1 , wherein the storage capacitor that is formed in the luminescent region of the substrate.

9. The organic light emitting diode display device of claim 1 , wherein the bank layer is a non-transparent material.

10. The organic light emitting diode display device of claim 1 , wherein the total thickness of the first electrode and the transparent metal layer is 500 Å and the thickness of the insulating film is in the range of 500 Å and 4000 Å.

11. A method of fabricating an organic light emitting diode display device, the method comprising:
forming a thin film transistor driver on a substrate having a luminescent region;
forming a passivation film on the substrate to cover the thin film transistor driver;
forming a color filter on the passivation film to correspond to the luminescent region;
forming a planarization film to cover the color filter;
forming a transparent metal layer on the planarization film to overlap with the luminescent region;
forming an insulating film on the transparent metal layer;
forming a first electrode to connect with the thin film transistor driver and overlap the transparent metal layer, wherein the insulating film is interposed between the first electrode and the transparent metal layer to comprise a storage capacitor;
forming a bank layer having a bank hole that exposes a portion of the first electrode on the first electrode and the insulating film;
forming an organic light emitting layer on the first electrode, wherein light is emitted from the organic light emitting layer and through the luminescent region; and
forming a second electrode on the organic light emitting layer,
wherein the organic light emitting layer in the luminescent region is fully overlapped with the first electrode and the transparent metal layer.

12. The method of claim 11 , further comprising forming a gate electrode comprising the thin film transistor driver, wherein the gate electrode is coupled to a double gate electrode formed on the passivation film.

13. The method of claim 12 , wherein the gate electrode is coupled to the double gate electrode via a separate connection portion that is formed between the gate electrode and the double gate electrode.

14. The method of claim 12 , wherein the double gate electrode is comprised of a transparent conductive pattern and an opaque conductive pattern.

15. The method of claim 14 , wherein the transparent metal layer and the double gate electrode are formed by sequentially forming a transparent conductive material and an opaque conductive material over the substrate provided with the planarization film, and patterning the transparent conductive material and the opaque conductive material through photolithography using a halftone mask.

16. The method of claim 15 , wherein the photolithography using a halftone mask comprises:
forming the opaque conductive pattern and a light blocking layer by pattering the opaque conductive material based on the halftone mask; and
forming the transparent conductive pattern and the transparent metal, layer by patterning the transparent conductive material based on the halftone mask.

17. The method of claim 16 , wherein the light blocking layer is formed on the transparent metal layer to cover a portion of the planarization film.

18. The method of claim 11 , wherein light emitted from the organic light emitting layer is emitted out via the substrate after passing through the first electrode, the insulating film, and the transparent metal layer.

19. The method of claim 11 , wherein the bank layer is a non-transparent material.

20. The method of claim 11 , wherein the total thickness of the first electrode and the transparent metal layer is 500 Å and the thickness of the insulating film is in the range of 500 Å and 4000 Å.

Assignees

• Lg Display Co Ltd

Inventors

• Beak Jung-Sun
• Kim Jeong-Oh
• Kim Yong-Min

Classifications

• H01L27/322

  Electricity · mapped topic

• H01L27/3265

  Electricity · mapped topic

• H01L27/3262

  Electricity · mapped topic

• H01L27/3246 Primary

  Electricity · mapped topic

• H10K59/1213

  the pixel elements being TFTs · CPC title