Organic light emitting transistor and display device including the same

Patent metadata

Field	Value
Publication number	US-9406909-B2
Application number	US-201313800547-A
Country	US
Kind code	B2
Filing date	Mar 13, 2013
Priority date	Oct 30, 2012
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

An organic light emitting transistor increases the amount of charge induced into an organic layer, and a display device includes the organic light emitting transistor. The organic light emitting transistor includes a substrate, an organic semiconductor layer positioned on the substrate, a source electrode and a drain electrode spaced apart from each other while contacting the organic semiconductor layer, a gate electrode insulated from the organic semiconductor layer, the source electrode and the drain electrode and positioned to overlap the organic semiconductor layer, and an auxiliary electrode overlapping the source electrode or the drain electrode.

First claim

What is claimed is:

1. An organic light emitting transistor, comprising:
a substrate;
an organic semiconductor layer positioned on the substrate;
a source electrode and a drain electrode spaced apart from each other while contacting the organic semiconductor layer;
a gate electrode insulated from the organic semiconductor layer, the source electrode and the drain electrode, and positioned to overlap the organic semiconductor layer; and
a first auxiliary electrode overlapping the source electrode and a second auxiliary electrode overlapping the drain electrode,
the gate electrode not overlapping the source electrode and the drain electrode,
wherein the first auxiliary electrode, the second auxiliary electrode and the gate electrode are disposed directly on a same layer.

2. The organic light emitting transistor of claim 1 , the first auxiliary electrode overlapping the source electrode configured to accept an application of a negative-polarity voltage.

3. The organic light emitting transistor of claim 1 , the second auxiliary electrode overlapping the drain electrode configured to accept an application of a positive-polarity voltage.

4. The organic light emitting transistor of claim 1 , the second auxiliary electrode configured to accept an application of a voltage, the first auxiliary electrode configured to accept an application of a voltage having a same polarity as the voltage applied to the second auxiliary electrode.

5. The organic light emitting transistor of claim 1 , the first auxiliary electrode configured to accept an application of a negative-polarity voltage, and the second auxiliary electrode configured to accept an application of a positive-polarity voltage.

6. An organic light emitting transistor, comprising:
a substrate;
an organic semiconductor layer positioned on the substrate;
a source electrode and a drain electrode spaced apart from each other while contacting the organic semiconductor layer;
a gate electrode insulated from the organic semiconductor layer, the source electrode and the drain electrode, and positioned to overlap the organic semiconductor layer; and
an auxiliary electrode overlapping one of the source electrode and the drain electrode,
the gate electrode not overlapping the source electrode and the drain electrode,
wherein the gate electrode comprises:
a first gate electrode adjacent to the source electrode; and
a second gate electrode adjacent to the drain electrode.

7. The organic light emitting transistor of claim 6 , the second gate electrode configured to accept an application of a voltage, the first gate electrode configured to accept an application of a voltage higher than the voltage applied to the second gate electrode.

8. The organic light emitting transistor of claim 6 , the second gate electrode configured to accept an application of a voltage, the first gate electrode configured to accept an application of a voltage with a different polarity from the voltage applied to the second gate electrode.

9. A display device, comprising:
a display panel including a plurality of organic light emitting transistors; and
a driver for driving the organic light emitting transistors; each of the organic light emitting transistors comprising:
a substrate;
an organic semiconductor layer positioned on the substrate;
a source electrode and a drain electrode spaced apart from each other while contacting the organic semiconductor layer;
a gate electrode insulated from the organic semiconductor layer, the source electrode and the drain electrode and positioned to overlap the organic semiconductor layer; and
a first auxiliary electrode overlapping the source electrode and a second auxiliary electrode overlapping the drain electrode,
the gate electrode not overlapping the source electrode and the drain electrode,
wherein the first auxiliary electrode, the second auxiliary electrode and the gate electrode are disposed directly on a same layer.

10. The display device of claim 9 , the first auxiliary electrode configured to accept an application of a negative-polarity voltage.

11. The display device of claim 9 , the second auxiliary electrode configured to accept an application of a positive-polarity voltage.

12. The display device of claim 9 , the second auxiliary electrode configured to accept an application of a voltage, the first auxiliary electrode configured to accept an application of a voltage having a same polarity as the voltage applied to of the second auxiliary electrode.

13. The display device of claim 9 , the first auxiliary electrode configured to accept an application of a negative-polarity voltage, and the second auxiliary electrode configured to accept an application of a positive-polarity voltage.

14. The display device of claim 9 , the driver including a voltage generator that supplies a control voltage applied to the auxiliary electrode.

15. A display device, comprising:
a display panel including a plurality of organic light emitting transistors; and
a driver for driving the organic light emitting transistors;
each of the organic light emitting transistors comprising:
a substrate;
an organic semiconductor layer positioned on the substrate;
a source electrode and a drain electrode spaced apart from each other while contacting the organic semiconductor layer;
a gate electrode insulated from the organic semiconductor layer, the source electrode and the drain electrode and positioned to overlap the organic semiconductor layer; and
an auxiliary electrode overlapping one of the source electrode and the drain electrode,
the gate electrode not overlapping the source electrode and the drain electrode,
wherein the gate electrode comprises:
a first gate electrode adjacent to the source electrode; and
a second gate electrode adjacent to the drain electrode.

16. The display device of claim 15 , the second gate electrode configured to accept an application of a voltage, the first gate electrode configured to accept an application of a voltage higher than voltage applied to the second gate electrode.

17. The display device of claim 15 ,
the second gate electrode configured to accept an application of a voltage, the first gate electrode configured to accept an application of a voltage having a different polarity compared to the voltage applied to the second gate electrode.

18. The display device of claim 15 , the driver configured to generate a first gate voltage and a second gate voltage, and connect to the first gate electrode and the second gate electrode to apply the first gate voltage to the first gate electrode and the second gate voltage to the second gate electrode.

19. An organic light emitting transistor, comprising:
a substrate;
an organic semiconductor layer positioned on the substrate;
a source electrode and a drain electrode spaced apart from each other while contacting the organic semiconductor layer;
a gate electrode insulated from the organic semiconductor layer, the source electrode and the drain electrode, and positioned to overlap the organic semiconductor layer; and
a first auxiliary electrode overlapping the source electrode and a second auxiliary electrode overlapping the drain electrode,
the gate electrode not overlapping the source electrode and the drain electrode,
wherein the first auxiliary electrode and the second auxiliary electrode are insulated from the source electrode and the drain electrode, and
wherein the first auxiliary electrode, the second auxiliary electrode and the gate electrode are disposed directly on a

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Ki Seo

Classifications

• H01L27/3274

  Electricity · mapped topic

• H01L51/5296 Primary

  Electricity · mapped topic

• H10K50/30 Primary

  Organic light-emitting transistors · CPC title

• H10K59/125

  including organic TFTs [OTFT] · CPC title

• H05B33/22

  characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers · CPC title