Display device

Patent metadata

Field	Value
Publication number	US-10062743-B2
Application number	US-201615372774-A
Country	US
Kind code	B2
Filing date	Dec 8, 2016
Priority date	May 11, 2016
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A display device includes: a plurality of pixels each including a driving thin film transistor and a storage capacitor, wherein each of the pixels further includes: a driving semiconductor layer including a driving channel region, a driving source region, and a driving drain region; a first electrode layer, a portion of the first electrode layer overlapping the driving channel region; a second electrode layer overlapping the first electrode layer; a node connection line having a first side connected to the first electrode layer; a pixel electrode overlapping the first electrode layer and the second electrode layer; and a shielding layer between the first electrode layer and the pixel electrode and overlapping the first electrode layer, the node connection line, and the pixel electrode.

First claim

What is claimed is:

1. A display device, comprising;
a plurality of pixels each comprising a driving thin film transistor and a storage capacitor, wherein each of the pixels further comprises;
a driving semiconductor layer comprising a driving channel region, a driving source region, and a driving drain region;
a first electrode layer, a portion of the first electrode layer overlapping the driving channel region;
a second electrode layer overlapping the first electrode layer;
a node connection line having a first side connected to the first electrode layer;
a pixel electrode overlapping the first electrode layer; and
a shielding layer between the first electrode layer and the pixel electrode, the shielding layer overlapping the first electrode layer, the node connection line, and the pixel electrode, wherein the node connection line is between the second electrode layer and the shielding layer.

2. The display device of claim 1 , wherein a constant voltage is applied to the shielding layer.

3. The display device of claim 2 , wherein a driving voltage is applied to the shielding layer.

4. The display device of claim wherein each pixel further comprises a driving voltage line below the shielding layer and above the second electrode layer and for supplying a driving voltage.

5. The display device of claim 4 , further comprising:
an insulating layer between the driving voltage line and the shielding layer, wherein the driving voltage line is connected to the shielding layer via a contact hole in the insulating layer.

6. The display device of claim 1 , wherein the shielding layer covers the entire node connection line.

7. The display device of claim 1 , wherein the first electrode layer comprises an island type electrode layer.

8. The display device of claim 1 , wherein each of the pixels further comprises:
a switching thin film transistor connected to a scan line and a data line; and
a compensation thin film transistor configured to be turned on by a scan signal of the scan line and configured to diode-connect the driving thin film transistor, a second side of the node connection line is connected to the compensation thin film transistor.

9. The display device of claim 1 , wherein each of the pixels further comprises:
a compensation semiconductor layer comprising a compensation channel region, a compensation source region, and a compensation drain region; and
a compensation gate electrode overlapping the compensation channel region, and one of the compensation source region and the compensation drain region is electrically connected to one of the driving source region and the driving drain region.

10. The display device of claim 9 , wherein the compensation gate electrode comprises a first compensation gate electrode and a second compensation gate electrode above the compensation semiconductor layer, the first and second compensation gate electrodes being spaced apart from each other, and the shielding layer covers a region of the compensation semiconductor layer that is exposed between the first and second compensation gate electrodes.

11. The display device of claim 9 , wherein one of the compensation source region and the compensation drain region does not overlap the shielding layer.

12. The display device of claim 9 , wherein the other one of the compensation source region and the compensation drain region overlaps the shielding layer.

13. The display device of claim 12 , wherein the other one of the compensation source region and the compensation drain region is electrically connected to the first electrode layer.

14. The display device of claim 1 , wherein each of the pixels further comprises:
a switching gate electrode and a switching semiconductor layer respectively connected to a scan line and a data line, wherein the shielding layer is above the first electrode layer, the second electrode layer, and the data line and at least one insulating layer is disposed between the shielding layer and the first electrode layer, the second electrode layer, and the data line.

15. A display device, comprising:
a plurality of pixels, wherein at least one of the pixels comprises:
a first electrode layer overlapping a driving channel region of a driving transistor;
a second electrode layer overlapping the first electrode layer;
a node connection line connected to the first electrode layer;
a pixel electrode overlapping the first and second electrode layers; and
a shielding layer between the first electrode layer and the pixel electrode and overlapping the node connection line, wherein the at least one pixel further comprises a driving voltage line below the shielding layer and above the second electrode layer.

16. A display device, comprising:
a plurality of pixels, wherein at least one of the pixels comprises:
a first electrode layer overlapping a channel region of a first transistor;
a second electrode layer overlapping the first electrode layer;
a node connection line electrically connected to the first electrode layer and one of a source region and a drain region of a second transistor;
a shielding layer overlapping the node connection line; and
a pixel electrode overlapping the shielding layer.

17. The display device of claim 16 , wherein the first electrode layer and the second electrode layer form a storage capacitor.

18. The display device of claim 16 , wherein the shielding layer completely covers the node connection line.

19. The display device of claim 16 , wherein the second transistor is a dual-gate transistor.

20. The display device of claim 16 , wherein the shielding layer is disposed between the node connection line and the pixel electrode.

21. The display device of claim 16 , further comprising a driving voltage line and an insulation layer, wherein the insulation layer is between the driving voltage line and the shielding layer.

22. The display device of claim 21 , wherein the shielding layer is over the insulation layer and the driving voltage line is below the insulation layer, and the shielding layer is connected to the driving voltage line via a contact hole of the insulating layer.

23. The display device of claim 16 , wherein the second electrode layer includes an open region exposing the first electrode layer, and the node connection line is connected to the first electrode layer via the open region.

24. The display device of claim 16 , wherein the shielding layer covers a portion of the second transistor.

25. The display device of claim 24 , wherein the shielding layer overlaps a gate electrode and a semiconductor layer of the second transistor.

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Seungkyu
• Kwon Taehoon
• Kim Byungsun

Classifications

• G09G3/3291

  in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• H10W42/20

  protecting against electromagnetic or particle radiation, e.g. light, X-rays, gamma-rays or electrons · CPC title

• H01L27/3262

  Electricity · mapped topic