Flexible display substrate, flexible organic light emitting display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-9659966-B2
Application number	US-201314106173-A
Country	US
Kind code	B2
Filing date	Dec 13, 2013
Priority date	Feb 1, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A flexible display substrate, a flexible organic light emitting display device, and a method of manufacturing the same are provided. The flexible display substrate comprises a flexible substrate including a display area and a non-display area extending from the display area, and a wire formed on the flexible substrate. At least a part of the non-display area of the flexible substrate is formed in a crooked shape in a bending direction, and the wire positioned on at least a part of the non-display area of the flexible substrate includes a plurality of first wire patterns, and a second wire pattern formed on the plurality of first wire patterns and electrically connected with the plurality of first wire patterns.

First claim

What is claimed is:

1. A flexible display substrate comprising:
a flexible substrate having;
a display area, and
a non-display area adjacent to the display area and including a curved portion that is bent: and
a wire extending from the display area over the curved portion, the wire having a plurality of first wire patterns and at least one second wire pattern in the non-display area: and
wherein each of the plurality of first wire patterns is spaced apart from an adjacent first wire pattern, wherein the second wire pattern electrically connects at least two of the plurality of first wire patterns.

2. The flexible display substrate of claim 1 , wherein the second wire pattern partially overlaps with the at least two of the plurality of first wire patterns.

3. The flexible display substrate of claim 2 , wherein each of the at least two of the plurality of first wire patterns overlaps with the second wire pattern and is in physical contact with the second wire pattern.

4. The flexible display substrate of claim 3 , further comprising additional second wire patterns, wherein each of the additional second wire patterns electrically connects the first wire patterns.

5. The flexible display substrate of claim 4 , wherein the second wire pattern and the additional second wire patterns have different lengths.

6. The flexible display substrate of claim 1 , wherein the second wire pattern covers at least one of the plurality of first wire patterns entirely.

7. The flexible display substrate of claim 1 , wherein the second wire pattern is in physical contact with all of the plurality of first wire patterns.

8. The flexible display substrate of claim 1 , wherein the second wire pattern has greater flexibility than the plurality of first wire patterns.

9. The flexible display substrate of claim 2 , wherein two adjacent first wire patterns are spaced apart by a predetermined distance, and the second wire pattern has a length longer the predetermined distance.

10. The flexible display substrate of claim 2 , further comprising an insulation layer formed between and formed on each of the plurality of first wire patterns, wherein the second wire pattern is disposed on the insulation layer.

11. The flexible display substrate of claim 2 , wherein at least a portion of the wire in the curved portion extends in a direction that is not parallel to a bending direction of the curved portion.

12. The flexible display substrate of claim 2 , wherein the second wire pattern comprises a plurality of portions, at least one of the plurality of portions extending in a direction that is not parallel to a bending direction of the curved portion.

13. The flexible display substrate of claim 1 , further comprising a third wire pattern on the display area of the flexible substrate, wherein the third wire pattern is electrically connected to the plurality of first wire patterns.

14. The flexible display substrate of claim 1 , further comprising a thin film transistor (TFT) on the display area of the flexible substrate to operate a light emitting element based on a signal transmitted via the wire.

15. A flexible display device, comprising:
a flexible substrate including:
a display area that is substantially flat along a plane, and
a non-display area including a bending area adjacent to the display area and bending away from the plane;

a wire extending from the display area over the bending area of the flexible substrate; and
a crack prevention layer disposed on at least one of top and bottom surfaces of the wire and including at least one of a porous material and nanoparticles,
wherein the wire includes a first layer of wire segments and a second layer of wire segments electrically connecting the first layer of wire segments, at least part of the second layer formed on the first layer, and wherein at least one of the first layer of wire segments and the second layer of wire segments are in the form of an island in the bending area so as to reduce or prevent cracks on the wire upon the bending the flexible substrate at the bending area.

16. The flexible display device of claim 15 , further comprising:
a passivation layer formed above the wire at an opposite side of the flexible substrate; and
wherein the crack prevention layer is disposed between the passivation layer and the wire.

17. The flexible display device of claim 15 , further comprises a display unit having an anode, a cathode, an organic light emitting diode between the anode and the cathode, and a plurality of thin-film-transistors (TFT), each TFT having a source electrode, a drain electrode and a gate electrode, wherein the first layer or the second layer is formed of the same material as at least one of the anode, the cathode, the source electrode, the drain electrode and the gate electrode.

18. The flexible display device of claim 17 , wherein the wire is connected to at least one of the anode, the cathode, the source electrode, the drain electrode and the gate electrode.

19. The flexible display device of claim 15 , further comprising a separation layer interposed between the first layer of wire segments and the second layer of wire segments, the separation layer having a plurality of contact holes, wherein the first layer is in physically contact with the second layer through the plurality of contact holes.

20. The flexible display device of claim 19 , further comprises:
a buffer layer interposed between the wire and the flexible substrate; and
a crack prevention layer interposed between the buffer layer and the wire.

21. The flexible display device of claim 19 , further comprises:
a passivation film disposed on the wire; and
a crack prevention layer interposed between the passivation film and the wire.

22. The flexible display device of claim 15 , further comprising a third layer of wire segment on the display area, wherein the third layer of wire segment is electrically connected the first layer of wire segments.

23. The flexible display device of claim 17 , wherein the plurality of thin film transistor (TFT) on the display area to operate the organic light emitting diode based on a signal transmitted via the wire.

24. A method fabrication a flexible display device, comprising:
forming a plurality of first wire segments that extend from a display area of a flexible substrate over at least a bending area of a non-display area of the flexible substrate;
forming a second wire segment bridging the first wire segments in the bending area of the non-display area of the flexible substrate;
forming a display unit on the display area of a flat area adjacent to the bending area, the display unit having an anode, a cathode, an organic light emitting diode between the anode and the cathode, and a plurality of thin-film-transistors (TFT), each TFT having a source electrode, a drain electrode and a gate electrode, wherein the first wire segments or the second wire segment are formed of the same material as any one of the anode, the cathode, the source electrode, the drain electrod and the gate electrode; and
bending the flexible substrate at the bending area away from a plane along which the flat area of the flexible substrate extends,
wherein the first wire segments and the second wire segment are in the form of an island so as to reduce or prevent cracks on the wire upon the bending the flexible substrate at the bending area.

25. The method of claim 24 , wherein forming the plu

Assignees

• Lg Display Co Ltd

Inventors

• Kwak Sanghyeon
• Yang Heeseok
• Youn Sangcheon
• Kwon Seyeoul

Classifications

• H10K59/873

  Encapsulations · CPC title

• H10K59/8722

  Peripheral sealing arrangements, e.g. adhesives, sealants · CPC title

• H10K59/87

  Passivation; Containers; Encapsulations · CPC title

• H10D86/60

  wherein the TFTs are in active matrices · CPC title

• H10D86/411 Primary

  characterised by materials, geometry or structure of the substrates · CPC title