Flexible display device including the crack preventing portion

• US 10,135,028 B2
• Filed: 10/24/2016
• Issued: 11/20/2018
• Est. Priority Date: 05/26/2016
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Kim, JongSung, Yoon, JongGeun, Jung, Goeun, Kwon, HyungGeun
• Primary Examiner(s): Le, Thao X
• Assistant Examiner(s): OJEH, NDUKA E
• Application Number:
  US15/332,242
• Publication Number:
  US 20170346041A1
• Time in Patent Office: 757 Days
• Field of Search: 257 40, 257 57, 438 23
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells

Abstract

A flexible display device includes a base substrate defining a display area and a non-display area; a thin film transistor in the display area of the base substrate; an organic light emitting diode on and connected with the thin film transistor; an encapsulation layer on the organic light emitting diode; and a crack preventing portion in the non-display area defined by the base substrate.

Claims

1. A flexible display device, comprising:

a base substrate defining a display area and a non-display area;

a thin film transistor in the display area of the base substrate;

an organic light emitting diode on and connected with the thin film transistor;

an encapsulation layer on the organic light emitting diode;

a crack preventing portion in the non-display area defined by the base substrate; and

a crack preventing bump in the non-display area of the base substrate,

wherein the encapsulation layer includes a plurality of inorganic films that extend from the display area to the non-display area and a plurality of organic films that are alternately disposed with the plurality of inorganic films, wherein the plurality of inorganic films includes first, second, and third inorganic films deposited in sequence, and wherein the crack preventing bump is disposed between two adjacent inorganic films among the plurality of inorganic films in the non-display area,

wherein at least one of the plurality of inorganic films is disposed between the crack preventing portion and the crack preventing bump in the non-display area, and the crack preventing portion covers an entire upper surface of the at least one of the inorganic films on the crack preventing bump and has a planarized upper surface.

2. The flexible display device according to claim 1, wherein each of the plurality of organic films is disposed in the display area, but is absent in the non-display area.

3. The flexible display device according to claim 2, wherein each of the plurality of organic films is interposed between adjacent ones of the inorganic films.

4. The flexible display device according to claim 1, wherein the crack preventing portion is formed of a same material as that of any one among the plurality of organic films.

5. The flexible display device according to claim 1, wherein an upper surface of the crack preventing portion is a same height as that of an upper surface of the encapsulation layer disposed in the display area.

6. The flexible display device according to claim 1, wherein the crack preventing portion extends from the non-display area to the display area such that the crack preventing portion covers an upper surface of the encapsulation layer in the display area.

7. The flexible display device according to claim 1, wherein the crack preventing portion is between the second and third inorganic films in the non-display area.

8. The flexible display device according to claim 1, wherein the crack preventing bump has a reverse-tapered shape in which a width of an upper surface therein is greater than a width of a lower surface thereof.

9. The flexible display device according to claim 1, wherein the crack preventing bump includes a first auxiliary crack preventing bump and a second auxiliary crack preventing bump, wherein the first auxiliary crack preventing bump has a tapered shape in which a width of an upper surface therein is less than a width of a lower surface thereof, and wherein the second auxiliary crack preventing bump has a reverse-tapered shape in which a width of an upper surface therein is greater than a width of a lower surface thereof.

10. The flexible display device according to claim 1, wherein the crack preventing portion is on the crack preventing bump and seals the crack preventing bump.

11. The flexible display device according to claim 1, wherein the crack preventing bump and the crack preventing portion are formed of different materials.

12. The flexible display device according to claim 1, further comprising a bank disposed adjacent to the third inorganic film.

13. The flexible display device according to claim 1, wherein the third inorganic film seals the organic light emitting diode.

14. The flexible display device according to claim 1, wherein the encapsulation layer directly contacts an entire upper surface of the organic light emitting diode.

15. The flexible display device according to claim 1, wherein no gap exists between a center of the organic light emitting diode and the encapsulation layer.

16. A flexible display device, comprising:

a base substrate defining a display area and a non-display area;

a thin film transistor in the display area of the base substrate;

an organic light emitting diode on and connected with the thin film transistor;

an encapsulation layer on the organic light emitting diode; and

a crack preventing portion in the non-display area defined by the base substrate,

wherein an upper surface of the crack preventing portion in the non-display area has a same height as that of an upper surface of the display; and

wherein the crack preventing portion covers an entire upper surface of the encapsulation layer in the non-display area, and has a planarized upper surface.

17. The flexible display device according to claim 16, further comprising a crack preventing bump in the non-display area of the base substrate;

wherein the encapsulation layer includes a plurality of inorganic films that extend from the display area to the non-display area and a plurality of organic films that are alternately disposed with the plurality of inorganic films,

wherein the plurality of inorganic films includes first and second inorganic films deposited in sequence, and wherein all of the crack preventing bump is disposed on first inorganic film.