Curved display device

• US 10,381,427 B2
• Filed: 12/29/2017
• Issued: 08/13/2019
• Est. Priority Date: 12/05/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Lim, YuSok, Cho, Sejun
• Primary Examiner(s): Withers, Grant S
• Application Number:
  US15/858,270
• Publication Number:
  US 20180122885A1
• Time in Patent Office: 592 Days
• Field of Search: None
• CPC Class Codes: G02F 1/133305 Flexible substrates, e.g. plastics, organic film
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A curved display device including a display area and a non-display area is provided. The curved display device includes a first direction area configured to maintain a flat state and a bending area connected to the first direction area. A thin film transistor (TFT) layer, a passivation layer, a sealing layer, and an upper film are provided on a base substrate in an area where the display area overlaps the bending area, and the sealing layer and the upper film extend to an area where the non-display area overlaps the bending area.

Claims

1. A display device comprising:

a substrate having a flat area and a bending area connected to the flat area;

a first thin film transistor (TFT) layer on the substrate;

a light emitting diode layer on the first TFT layer;

a passivation layer on the light emitting diode layer;

an upper film on the passivation layer, the upper film extending to a first area where a non-display area overlaps the bending area; and

a crack transfer preventing part in the first area,

a second TFT layer facing the first TFT layer with the crack transfer preventing part therebetween;

wherein the passivation layer covers the first TFT layer, the second TFT layer, and the crack transfer preventing part.

2. The display device of claim 1, wherein each of the first TFT layer and the second TFT layer includes a protective layer, and the protective layer of the first TFT layer faces the protective layer of the second TFT layer in the first area.

3. The display device of claim 2, wherein the light emitting diode layer includes a first electrode on the protective layer of the first TFT layer.

4. The display device of claim 2, wherein the passivation layer is provided directly on the protective layer of the second TFT layer.

5. The display device of claim 1, wherein the crack transfer preventing part has at least one among a recess, a groove and a hole.

6. The display device of claim 1, wherein the upper film has at least one among a polarizing film and a touch screen film.

7. The display device of claim 1, further comprising a driver on a second area where the non-display area overlaps the flat area.

8. A display device comprising:

a substrate having a flat area and a bending area connected to the flat area;

a thin film transistor (TFT) layer including a plurality of layers on the substrate;

a light emitting diode layer on the TFT layer; and

a passivation layer on the light emitting diode layer,

wherein the TFT layer includes a first TFT layer in an area where a non-display area overlaps the bending area and a second TFT layer in an area where a display area overlaps the bending area, and the first TFT layer is separated from the second TFT layer, in order to prevent a crack in the non-display area from being transferred to the display area.

9. The display device of claim 8, wherein at least one layer among the plurality of layers in the TFT layer in the area where the non-display area overlaps the bending area is separated from at least one layer among the plurality of layers in the TFT layer in the area where the display area overlaps the bending area.

10. The display device of claim 8, wherein the passivation layer extends from the area where the display area overlaps the bending area to the area where the non-display area overlaps the bending area through an area where the first TFT layer is separated from the second TFT layer.

11. The display device of claim 10, wherein the passivation layer includes a concave portion in the area where the first TFT layer is separated from the second TFT layer.

12. A display device comprising:

a substrate having a flat area and a bending area connected to the flat area;

a thin film transistor (TFT) layer including a plurality of layers on the substrate;

a light emitting diode layer on the TFT layer; and

a passivation layer on the light emitting diode layer, extending to a first area where a non-display area overlaps the bending area and a second area where a display area overlaps the bending area,

wherein a top of a first portion of the passivation layer provided in the first area is lower than each of a top of a second portion of the passivation layer provided in the first area and a top of the passivation layer provided in the second area, and

wherein a crack transfer preventing part is provided in an area corresponding to the first portion of the passivation layer.

13. The display device of claim 12, wherein the crack transfer preventing part includes a portion where one among the plurality of layers included in the TFT layer and the substrate is exposed.

14. The display device of claim 12, wherein the first portion of the passivation layer covers the crack transfer preventing part.

15. The display device of claim 12, wherein the second portion of the passivation layer covers one among the plurality of layers included in the TFT layer.

16. A display device comprising:

a substrate having a flat area and a bending area connected to the flat area;

a thin film transistor (TFT) layer including a protective layer on the substrate;

a light emitting diode layer on the TFT layer;

a moisture preventing layer on the light emitting diode layer to prevent moisture from penetrating into the light emitting diode layer;

an upper film on the moisture preventing layer, extending to an area where a non-display area overlaps the bending area; and

a crack transfer preventing part provided in the area, covered by the moisture preventing layer.

17. The display device of claim 16, wherein the moisture preventing layer further covers the TFT layer provided in the area where the non-display area overlaps the bending area.

18. The display device of claim 17, wherein the moisture preventing layer is provided directly on the protective layer of the TFT layer in the area where the non-display area overlaps the bending area.

19. The display device of claim 16, wherein the TFT layer includes a plurality of layers to insulate or protect an electrode, and the crack transfer preventing part includes a portion where one among the plurality of layers included in the TFT layer is exposed.