Organic light emitting display panel and organic light emitting display apparatus using the same

Patent metadata

Field	Value
Publication number	US-10811485-B2
Application number	US-201816219440-A
Country	US
Kind code	B2
Filing date	Dec 13, 2018
Priority date	Dec 29, 2017
Publication date	Oct 20, 2020
Grant date	Oct 20, 2020

Abstract

An organic light emitting display panel can include a substrate; pixels disposed on the substrate; a driving transistor including: a driving active layer, a driving gate electrode overlapping with the driving active layer, a driving first conductor extended from one end of the driving active layer, a driving second conductor extended from the other end of the driving active layer, and a driving first gate insulating film overlapping with the driving active layer; a switching transistor including: a switching active layer, a switching gate electrode overlapping with the switching active layer, a switching first conductor extended from one end of the switching active layer, a switching second conductor extended from the other end of the switching active layer, and a switching first gate insulating film overlapping with the switching active layer; an organic light emitting diode; and a second gate insulating film disposed between the driving and switching gate electrodes of the driving and switching transistors, and the driving first conductor, the driving second conductor, the driving first gate insulating film, the switching first conductor, the switching second conductor and the switching first gate insulating film.

First claim

What is claimed is:

1. An organic light emitting display panel comprising:
a substrate;
a plurality of pixels disposed on the substrate;
a driving transistor for driving at least one of the plurality of pixels, the driving transistor including:
a driving active layer,
a driving gate electrode overlapping with the driving active layer,
a driving first conductor extended from one end of the driving active layer,
a driving second conductor extended from the other end of the driving active layer, and
a driving first gate insulating film overlapping with the driving active layer;

a switching transistor electrically connected to the driving transistor, the switching transistor including:
a switching active layer,
a switching gate electrode overlapping with the switching active layer,
a switching first conductor extended from one end of the switching active layer,
a switching second conductor extended from the other end of the switching active layer, and
a switching first gate insulating film overlapping with the switching active layer;

an organic light emitting diode electrically connected to the driving transistor; and
a second gate insulating film disposed between the driving and switching gate electrodes of the driving and switching transistors, and the driving first conductor, the driving second conductor, the driving first gate insulating film, the switching first conductor, the switching second conductor and the switching first gate insulating film,
wherein lowermost surfaces of the driving and switching gate electrodes contact an uppermost surface of the second gate insulating film, and
wherein uppermost surfaces of the driving first conductor, the driving second conductor, the driving first gate insulating film, the switching first conductor, the switching second conductor and the switching first gate insulating film contact a lowermost surface of the second gate insulating film.

2. The organic light emitting display panel according to claim 1 , wherein the switching active layer and the driving active layer are made of a same material and located on a same layer,
wherein the driving first conductor, the driving second conductor, the switching first conductor and the switching second conductor are made of a same material,
wherein the driving first gate insulating film and the switching first gate insulating film are made of a same material, and
wherein the driving gate electrode and the switching gate electrode are made of a same material.

3. The organic light emitting display panel according to claim 1 , wherein the driving gate electrode and the driving first conductor are overlapped with each other, and
wherein the second gate insulating film is disposed between the driving gate electrode and the driving first conductor.

4. The organic light emitting display panel according to claim 1 , wherein the second gate insulating film is disposed across an entire surface of a display area of the organic light emitting display panel in a plate shape or a sheet shape, and
wherein the second gate insulating film covers the driving first gate insulating film in the driving transistor and the switching first gate insulating film in the switching transistor.

5. The organic light emitting display panel according to claim 4 , wherein the driving gate electrode of the driving transistor is electrically connected to the switching second conductor of the switching transistor through a first contact hole in the second gate insulating film.

6. The organic light emitting display panel according to claim 1 , further comprising:
a passivation film disposed on the driving transistor and the switching transistor;
a planarization film disposed on the passivation film;
a storage capacitor electrically connected between the driving gate electrode of the driving transistor and the organic light emitting diode; and
a first storage capacitor electrode of the storage capacitor disposed on the passivation film, the first storage capacitor electrode being overlapped with the driving gate electrode of the driving transistor,
wherein a portion of the driving gate electrode forms a second storage capacitor electrode of the storage capacitor, and
wherein the first storage capacitor electrode is electrically connected to the driving first conductor of the driving transistor through a second contact hole in the passivation film and a third contact hole in the second gate insulating film.

7. The organic light emitting display panel according to claim 6 , wherein the first storage capacitor electrode electrically connects the driving first conductor of the driving transistor with the organic light emitting diode, and
wherein the driving gate electrode bends around at least one of the second contact hole or the third contact hole.

8. The organic light emitting display panel according to claim 1 , further comprising:
a light shield for shielding light disposed in an area of the substrate, which corresponds to the driving transistor,
wherein the driving active layer, the driving first conductor and the driving second conductor are disposed on a buffer layer and overlap with the light shield.

9. The organic light emitting display panel according to claim 8 , wherein the driving first conductor of the driving transistor is electrically connected with the light shield through a fourth contact hole in the buffer layer.

10. An organic light emitting display apparatus comprising:
a substrate;
a plurality of pixels disposed on the substrate;
a driving transistor for driving at least one of the plurality of pixels, the driving transistor including:
a driving active layer,
a driving gate electrode overlapping with the driving active layer,
a driving first conductor extended from one end of the driving active layer,
a driving second conductor extended from the other end of the driving active layer, and
a driving first gate insulating film overlapping with the driving active layer;

a switching transistor electrically connected to the driving transistor, the switching transistor including:
a switching active layer,
a switching gate electrode overlapping with the switching active layer,
a switching first conductor extended from one end of the switching active layer,
a switching second conductor extended from the other end of the switching active layer, and
a switching first gate insulating film overlapping with the switching active layer;

an organic light emitting diode electrically connected to the driving transistor;
a second gate insulating film disposed under the driving and switching gate electrodes of the driving and switching transistors, and the second gate insulating film being disposed over the driving first conductor, the driving second conductor, the driving first gate insulating film, the switching first conductor, the switching second conductor and the switching first gate insulating film;
a gate driver configured to supply a gate pulse to gate lines in the organic light emitting display panel;
a data driver configured to supply a data voltage to data lines in the organic light emitting display panel; and
a controller configured to control the gate driver and the data driver,
wherein lowermost surfaces of the driving and switching gate electrodes contact an uppermost surface of the second gate insulating film, and
wherein uppermost surfaces of the driving first conductor, the driving second conductor, the driving first gate insulating film, the switching first conductor, the switching second conductor and the switching first gate insulating film contact a lowermost surface of the second gate insulating film.

11. The organic light emitting display panel ac

Assignees

• Lg Display Co Ltd

Inventors

• Park Sehee
• Yun Pilsang
• Park Jaeyoon

Classifications

• H10K59/131

  Interconnections, e.g. wiring lines or terminals · CPC title

• H10D86/423 Primary

  comprising semiconductor materials not belonging to the Group IV, e.g. InGaZnO · CPC title

• H10D86/441

  Interconnections, e.g. scanning lines · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10D86/481

  integrated with passive devices, e.g. auxiliary capacitors · CPC title