Display device having improved environmental tolerance

Patent metadata

Field	Value
Publication number	US-9947898-B2
Application number	US-201715448298-A
Country	US
Kind code	B2
Filing date	Mar 2, 2017
Priority date	Jun 16, 2016
Publication date	Apr 17, 2018
Grant date	Apr 17, 2018

Abstract

A display device includes a substrate including a display area and a non-display area surrounding the display area, a thin-film encapsulation layer disposed on the substrate, and a first blocking dam disposed outside the display area, the first blocking dam having at least one layer. Portions of the first blocking dam is removed, and thus, the divided pieces of the first blocking dam are spaced apart from each other, and a second blocking dam is disposed in at least one of a front portion and a rear portion of the first blocking dam corresponding to the spaced part.

First claim

What is claimed is:

1. A display device comprising:
a substrate comprising a display area and a non-display area surrounding the display area;
a thin-film encapsulation layer disposed on the substrate; and
a first blocking dam disposed outside the display area and surrounding the display area, wherein the first blocking dam has a laminated structure including at least one layer of an organic film and at least one layer of an inorganic film;
wherein portions of the first blocking dam are spaced apart from each other with a gap therebetween,
wherein a second blocking dam is disposed between the display area and a front portion of the gap in the first blocking dam, a first sidewall of the second blocking dam faces the display area, and a second sidewall of the second blocking dam faces the gap in the first blocking dam;
wherein the second blocking dam has a length greater than the gap, with one end of the second blocking dam overlapping a first end of the first blocking dam adjacent to one end of the gap, and an opposing end of the second blocking dam overlapping a second end of the first blocking dam adjacent to an opposing end of the gap, so that the second blocking dam extends beyond both the one end of the gap and the opposing end of the gap; and
wherein the second blocking dam has a laminated structure including at least one layer of an organic film and at least one layer of an inorganic layer.

2. The display device of claim 1 , wherein
the second blocking dam has an island shape.

3. The display device of claim 1 , wherein
the second blocking dam surrounds the display area.

4. The display device of claim 1 , wherein
the second blocking dam is also disposed at a rear portion of the first blocking dam.

5. The display device of claim 1 , wherein the display area comprises:
a thin-film transistor comprising a semiconductor active layer, a gate electrode, a source electrode, and a drain electrode,
and
at least one organic film,

a plurality of voltage supply lines is disposed in the non-display area,
at least one organic film is disposed on the display area, and
the first and second blocking dams are spaced apart from each other.

6. The display device of claim 5 , wherein
the voltage supply lines comprise first and second voltage supply lines to which different voltages are respectively applied,
the first and second voltage supply lines have an interval therebetween, and
a connector configured to connect the organic film and the first blocking dam is disposed in the interval.

7. The display device of claim 6 , wherein
the connector is configured to cross a separation area not having the organic film.

8. The display device of claim 7 , wherein
the second blocking dam is disposed in the separation area.

9. The display device of claim 8 , wherein
the second blocking dam is disposed between the organic film and the first blocking dam,
a first sidewall of the second blocking dam faces the organic film, and
a second sidewall of the second blocking dam faces the gap in the first blocking dam.

10. The display device of claim 6 , wherein
the first voltage supply line comprises a first main line corresponding to the display area, and a first connection line extending from the first main line in a first direction,
the second voltage supply line comprises a second main line surrounding remaining areas of the display area, and a second connection line extending from the second main line in the first direction, and
the interval is positioned between the first and second connection lines.

11. The display device of claim 5 , wherein
the second blocking dam has an island shape.

12. The display device of claim 5 , wherein
the second blocking dam surrounds the display area.

13. The display device of claim 5 , wherein
the first blocking dam comprises a same material as that of at least one of a gate insulating layer, an interlayer insulating layer, a planarization film, a pixel-defining layer, and a spacer, and
the organic films are laminated successively in a direction perpendicular to the substrate.

14. The display device of claim 13 , wherein
the second blocking dam is at the same layer as at least one of the gate insulating layer, the interlayer insulating layer, the planarization film, the pixel-defining layer, and the spacer.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Sangki
• Lee Donghyun

Classifications

• H10K59/124

  Insulating layers formed between TFT elements and OLED elements · CPC title

• H10K59/122

  Pixel-defining structures or layers, e.g. banks · CPC title

• H10K59/12

  Active-matrix OLED [AMOLED] displays · CPC title

• H10K50/8428

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

• H10K50/8445

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