Organic light emitting display device and a method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-10490617-B2
Application number	US-201715689050-A
Country	US
Kind code	B2
Filing date	Aug 29, 2017
Priority date	Aug 29, 2016
Publication date	Nov 26, 2019
Grant date	Nov 26, 2019

Abstract

An organic light emitting device includes an organic light emitting diode including an anode and a cathode, a driving transistor including a first semiconductor layer, wherein the driving transistor is electrically connected to the anode of the organic light emitting diode, and a control transistor including a second semiconductor layer including a different material from the first semiconductor layer and configured to control the driving transistor. The first semiconductor layer includes a first channel part, and first and second contact parts, and the second semiconductor layer includes a second channel part, and third and fourth contact parts. One of the first and second contact parts directly contacts one of the third and fourth contact parts.

First claim

What is claimed is:

1. An organic light emitting display device, comprising:
an organic light emitting diode comprising an anode and a cathode;
a driving transistor comprising a first semiconductor layer, wherein the driving transistor is electrically connected to the anode of the organic light emitting diode; and
a control transistor comprising a second semiconductor layer including a different material from the first semiconductor layer and configured to control the driving transistor,
wherein the first semiconductor layer comprises a first channel part, and first and second contact parts spaced apart from each other with the first channel part therebetween,
the second semiconductor layer comprises a second channel part, and third and fourth contact parts spaced apart from each other with the second channel part therebetween, and
one of the first and second contact parts directly contacts one of the third and fourth contact parts.

2. The organic light emitting display device of claim 1 , wherein the first and second semiconductor layers are disposed on different layers from each other.

3. The organic light emitting display device of claim 2 , further comprising an interlayer insulation layer interposed between the first and second semiconductor layers,
wherein a contact hole exposing a portion of one of the third and fourth contact parts is disposed in the interlayer insulation layer and one of the first and second contact parts directly contacts one of the third and fourth contact parts via the contact hole.

4. The organic light emitting display device of claim 3 , wherein the driving transistor comprises a first control electrode, a first input electrode connected to the first contact part, and a first output electrode connected to the second contact part,
the control transistor comprises a plurality of transistors; and
at least one of the plurality of transistors comprises a second control electrode, an input electrode connected to the third contact part, and an output electrode connected to the fourth contact part.

5. The organic light emitting display device of claim 4 , wherein the first control electrode of the driving transistor overlaps the first semiconductor layer and the second control electrode of a first transistor of the plurality of transistors overlaps the second semiconductor layer.

6. The organic light emitting display device of claim 5 , further comprising a storage capacitor connected to the driving transistor,
wherein the storage capacitor comprises a first electrode and a second electrode disposed to face the first electrode, wherein the first electrode of the storage capacitor is the first control electrode of the driving transistor.

7. The organic light emitting display device of claim 5 , wherein the second semiconductor layer is disposed on the interlayer insulation layer and the second control electrode of the first transistor of the plurality of transistors is disposed to face the second channel part of the second semiconductor layer.

8. The organic light emitting display device of claim 7 , wherein the first semiconductor layer comprises low temperature polysilicon and the second semiconductor layer comprises an oxide semiconductor.

9. The organic light emitting display device of claim 1 , wherein the control transistor comprises an oxide semiconductor as the second semiconductor layer.

10. The organic light emitting display device of claim 9 , wherein the driving transistor comprises polysilicon as the first semiconductor layer and the driving transistor is a P type transistor or an N type transistor.

11. The organic light emitting display device of claim 1 , further comprising:
a data line configured to receive a data voltage;
a power line configured to receive a power voltage;
a scan line configured to receive a scan signal;
a first light emitting line configured to receive a first light emitting control signal;
a second light emitting line configured to receive a second light emitting control signal; and
an initialization line configured to receive an initialization voltage.

12. The organic light emitting display device of claim 11 , wherein the control transistor comprises second, third, fourth, fifth and sixth transistors.

13. The organic light emitting display device of claim 12 , wherein the second transistor comprises a second control electrode connected to the scan line, a second output electrode connected to a first input electrode of the driving transistor at a first node, and a second input electrode connected to a first control electrode of the driving transistor at a third node;
the third transistor comprises a third control electrode connected to the first light emitting line, a third input electrode configured to receive a power voltage, and a third output electrode connected to the first input electrode of the driving transistor at the first node;
the fourth transistor comprises a fourth control electrode connected to the scan line, a fourth input electrode connected to the data line, and a fourth output electrode connected to a fourth node;
the fifth transistor comprises a fifth control electrode connected to the second light emitting line, a fifth input electrode connected to the fourth node, and a fifth output electrode connected to the second node; and
the sixth transistor comprises a sixth control electrode connected to the scan line, a sixth input electrode connected to the initialization line, and a sixth output electrode connected to the anode of the organic light emitting diode.

14. The organic light emitting display device of claim 13 , further comprising a storage capacitor disposed between the third node and the fourth node.

15. The organic light emitting display device of claim 13 , wherein the first contact part of the driving transistor directly contacts a fourth contact part of one of the second and third transistors.

16. The organic light emitting display device of claim 13 , wherein the second contact part of the driving transistor directly contacts a fourth contact part of one of the fifth and sixth transistors.

17. The organic light emitting display device of claim 1 , wherein a portion of the first semiconductor layer overlaps a portion of the second semiconductor layer.

18. A display device, comprising:
a light emitting element comprising a first terminal and a second terminal;
a first transistor comprising a first semiconductor layer, wherein the first transistor is electrically connected to the first terminal of the light emitting element; and
a second transistor comprising a second semiconductor layer including a different material from the first semiconductor layer and configured to control the first transistor,
wherein a first contact part of the first semiconductor layer directly contacts a second contact part of the second semiconductor layer.

19. The display device of claim 18 , wherein an output terminal of the first transistor is electrically connected to an output terminal of the second transistor via the direct connection of the first and second contact parts.

20. The display device of claim 18 , wherein the light emitting element is an organic light emitting diode.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Sunghwan
• Park Junhyun
• Shin Kyoungju
• Lee Ansu
• Jun Byunggeun
• Chai Chongchul

Classifications

• G09G3/3225 Primary

  using an active matrix · CPC title

• H01L27/3265

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic

• H01L2227/323

  Electricity · mapped topic

• H01L27/1251

  Electricity · mapped topic