Organic light emitting diode device

Patent metadata

Field	Value
Publication number	US-12426468-B2
Application number	US-202217679061-A
Country	US
Kind code	B2
Filing date	Feb 23, 2022
Priority date	Nov 28, 2018
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

An inorganic light emitting diode device includes: a substrate including a plurality of sub-pixels; a thin film transistor (TFT) in each of the plurality of sub-pixels, wherein the TFT has at least one inorganic layer; an encapsulation layer on an organic light emitting layer, wherein the encapsulation layer includes at least one organic encapsulation layer and at least one inorganic encapsulation layer; and an opening exposing the inorganic layer of the TFT, wherein the opening connects the at least one inorganic encapsulation layer with the inorganic layer of the TFT.

First claim

What is claimed is:

1. An organic light emitting diode (OLED) device, comprising:
a flexible substrate including a plurality of sub-pixels;
a thin film transistor (TFT) in each of the plurality of sub-pixels, wherein the TFT includes a source electrode and a drain electrode;
a passivation layer on the TFT;
a planarization layer on the passivation layer;
an organic light emitting diode on the planarization layer and including a first electrode, an organic light emitting layer and a second electrode;
a bank on the planarization layer and disposed at a boundary region of the sub-pixel;
a metal layer between the passivation layer and the flexible substrate and overlapping at least a portion of the first electrode and at least a portion of the bank, wherein the metal layer is disposed at the same layer as the source electrode and the drain electrode;
an encapsulation layer on an organic light emitting diode, wherein the encapsulation layer includes at least one organic encapsulation layer and at least one inorganic encapsulation layer; and
a touch electrode on the encapsulation layer overlapping at least a portion of the bank,
wherein the first electrode is directly connected to the drain electrode and overlaps at least a portion of the metal layer.

2. The OLED device of claim 1 , wherein the TFT has at least one inorganic layer.

3. The OLED device of claim 2 , further comprising:
an opening exposing the inorganic layer of the TFT,
wherein the encapsulation layer includes at least one organic encapsulation layer and at least one inorganic encapsulation layer.

4. The OLED device of claim 3 , wherein the opening connects the at least one inorganic encapsulation layer with the inorganic layer of the TFT or the passivation layer.

5. The OLED device of claim 3 , wherein the opening defines at least one area in a bending region for reducing stress caused by bending the OLED device.

6. The OLED device of claim 5 , wherein the area includes at least one sub-pixel.

7. The OLED device of claim 5 , wherein the area is encapsulated by an inorganic material.

8. The OLED device of claim 1 , further comprising:
a touch driving portion at a non-display region other than a bezel region,
wherein the touch driving portion is configured to supply a touch input driving signal to the touch electrode through the first signal line, and
wherein the touch electrode is configured to supply a touch input sensing signal to the touch driving portion through the first signal line.

9. The OLED device of claim 7 , wherein the first signal line is a data line.

10. The OLED device of claim 7 , wherein a driving power is configured to be supplied to the touch electrode through the first signal line.

11. The OLED device of claim 3 , further comprising a filling member on the at least one inorganic encapsulation layer and filling the opening.

12. The OLED device of claim 1 , wherein the TFT further includes a gate electrode and a semiconductor layer, and the semiconductor layer is formed of an amorphous silicon, a polycrystalline silicon, or an oxide semiconductor material.

13. The OLED device of claim 1 , further comprising:
an opening exposing the inorganic layer of the TFT,
wherein the opening overlaps at least a portion of the metal layer.

14. The OLED device of claim 1 , further comprising:
a spacer on the bank.

15. The OLED device of claim 1 , wherein the flexible substrate includes a folding axis in a region including the plurality of sub-pixels.

16. The OLED device of claim 15 , wherein the flexible substrate includes a first display region and a second display region, and the first and second display regions are divided from each other with respect to the folding axis.

17. The OLED device of claim 1 , wherein the second electrode is not presented in the opening.

18. An organic light emitting diode (OLED) device, comprising:
a flexible substrate;
a thin film transistor (TFT) on the flexible substrate including a semiconductor layer, a gate electrode, a source electrode and a drain electrode;
a passivation layer covering the TFT;
a planarization layer on the passivation layer;
an organic light emitting diode on the planarization layer and including a first electrode, an organic light emitting layer and a second electrode;
a bank on the planarization layer and surrounding the organic light emitting diode; and
an encapsulation layer on the organic light emitting diode,
wherein an encapsulation hole is in the encapsulation layer to expose a part of the passivation layer,
wherein a touch electrode is on the exposed part of the passivation layer and extends from the drain electrode,
wherein the TFT has at least one inorganic layer,
wherein an opening is disposed to expose the inorganic layer of the TFT,
wherein the opening defines at least one area in a bending region for reducing stress caused by bending the OLED device, and
wherein the encapsulation layer includes at least one organic encapsulation layer and at least one inorganic encapsulation layer.

19. The OLED device of claim 18 , wherein the semiconductor layer is formed of an amorphous silicon, a polycrystalline silicon, or an oxide semiconductor material.

20. The OLED device of claim 18 , wherein the encapsulation layer includes a first encapsulation layer and a second encapsulation layer with at least one organic layer between the first and second encapsulation layers.

21. The OLED device of claim 18 , further comprising:
a multi-buffer layer on the first substrate; and
an active buffer layer on the multi-buffer layer and below the TFT;
wherein
the encapsulation hole is located at removed parts of the encapsulation layer, the bank, and the planarization layer, thereby exposing the part of the passivation layer.

22. The OLED device of claim 18 , wherein the passivation layer has an island pattern on each of a source electrode and the drain electrode of the TFT.

23. The OLED device of claim 18 , further comprising:
a touch driving portion at a non-display region other than a bezel region,
wherein the touch driving portion is configured to supply a touch input driving signal to the touch electrode through the first signal line, and
wherein the touch electrode is configured to supply a touch input sensing signal to the touch driving portion through the first signal line.

24. The OLED device of claim 23 , wherein the first signal line is a data line.

25. The OLED device of claim 23 , wherein a driving power is configured to be supplied to the touch electrode through the first signal line.

26. The OLED device of claim 18 , wherein the flexible substrate including a plurality of sub-pixels, and the bank includes an opening corresponding to each of the plurality of sub-pixels,
wherein the organic light emitting diode is disposed in the opening of each of the plurality of sub-pixels, and the encapsulation hole is positioned between adjacent openings.

Assignees

• Lg Display Co Ltd

Inventors

• Kim Mi-Seong
• Yoo Se-Jong
• Lee Kyoung-Mook

Classifications

• H10K50/805

  Electrodes · CPC title

• H10K59/8731

  multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers · CPC title

• H10K59/8723

  Vertical spacers, e.g. arranged between the sealing arrangement and the OLED · CPC title

• H10K59/805

  Electrodes · CPC title

• H10K2102/311

  Flexible OLED · CPC title