ORGANIC LIGHT-EMITTING DISPLAY DEVICE AND METHOD FOR MANUFACTURING ORGANIC LIGHT-EMITTING DISPLAY DEVICE

• US 20150137102A1
• Filed: 11/19/2014
• Published: 05/21/2015
• Est. Priority Date: 11/21/2013
• Status: Active Grant

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Display Co., Ltd.
• Inventors: Yang, HeeSeok
• Granted Patent: US 9,490,215 B2
• Time in Patent Office: Days
• US Class Current: 257/40
• CPC Class Codes: B32B 2307/422 Luminescent, fluorescent, phosphorescent
• CPC Class Codes: B32B 2457/206 Organic displays, e.g. OLED
• CPC Class Codes: B32B 37/14 characterised by the properties of the layers
• CPC Class Codes: B32B 37/144 using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding constructional features for tensioning B32B38/1825
• CPC Class Codes: B32B 38/0012 Mechanical treatment, e.g. roughening, deforming, stretching
• CPC Class Codes: B32B 38/1833 Positioning, e.g. registration or centering
• CPC Class Codes: H01L 2223/5442 comprising non digital, non alphanumeric information, e.g. symbols
• CPC Class Codes: H01L 2223/54426 for alignment
• CPC Class Codes: H01L 2223/54486 Located on package parts, e.g. encapsulation, leads, package substrate
• CPC Class Codes: H01L 23/544 Marks applied to semiconductor devices or parts, e.g. registration marks, alignment structures, wafer maps test patterns for characterising or monitoring manufacturing processes H01L22/00
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H10K 59/873 Encapsulations
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• 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
• CPC Class Codes: Y10T 156/1051 by folding

Abstract

Provided are an organic light-emitting display device and a method for manufacturing the same. A flexible substrate of the organic light-emitting display device is bent across a bend line and includes a first area, a first bending area adjacent to the first area, a second bending adjacent to the first bending area, and a second area adjacent to the second bending area. A wiring is formed over the first area, the first bending area, the second bending area, and the second area of the flexible substrate to electrically connect a display unit formed in the first area and a pad unit formed in the second area. A first alignment key is formed over the flexible substrate, and a second alignment is formed over the flexible substrate. The first alignment key is positioned to overlap the second alignment key with the flexible substrate bent across the bend line.

Claims

1. An organic light-emitting display device comprising:

a flexible substrate bent across a bend line, the flexible substrate including a first area, a first bending area adjacent to the first area, a second bending area adjacent to the first bending area, and a second area adjacent to the second bending area, the flexible substrate bent such that the first area is positioned to at least partially overlap the second area and the first bending area is positioned to at least partially overlap the second bending area;

a display unit formed in the first area of the flexible substrate;

a pad unit formed in the second area of the flexible substrate;

a wiring unit configured to electrically connect together the display unit and the pad unit, the wiring unit formed across the first area, the first bending area, the second bending area, and the second area;

a first alignment key formed over the flexible substrate; and

a second alignment key formed over the flexible substrate,

wherein the first alignment key is positioned to overlap the second alignment key with the flexible substrate bent across the bend line.

3. The organic light-emitting display device of claim 1, wherein the first alignment key is located in the first bending area and the second alignment key is located in the second bending area.

4. The organic light-emitting display device of claim 1, wherein the first alignment key is positioned to overlap the second alignment key such that a center of the first alignment key is in line with a center of the second alignment key when viewed from a direction normal to the first area and the second area.

5. The organic light-emitting display device of claim 1, wherein the first alignment key has a circular shape and the second alignment key has a cross shape.

6. The organic light-emitting display device of claim 5, wherein the first alignment key is positioned to overlap the second alignment key such that a center of the cross shape of the second alignment key is in line with a center of the circular shape of the first alignment key when viewed from a direction normal to the first area and the second area.

7. The organic light emitting display device of claim 1, wherein the second alignment key extends from the first alignment key, the first alignment key and the second alignment key forming a rectangle.

8. The organic light-emitting display device of claim 7, wherein a first portion of the rectangle corresponding to the first alignment key is in line with a second portion of the rectangle corresponding to the second alignment key when viewed from a direction normal to the first area and the second area.

9. The organic light emitting display device of claim 7, wherein the rectangle spans across the first area, the first bending area, the second bending area, and the second area.

10. The organic light emitting display device of claim 1, wherein the first alignment key includes a pattern of shapes and the second alignment key includes a line.

11. The organic light emitting display device of claim 10, wherein the pattern of shapes includes a first row of shapes and a second row of shapes, and the line of the second alignment key is positioned between the first row of shapes and the second row of shapes when viewed from a direction normal to the first area and the second area.

12. The organic light emitting display device of claim 1, wherein the wiring extends across the first bending area and the second bending area oblique to a direction of bending of the flexible substrate across the bend line.

13. The organic light emitting display device of claim 12, wherein the wiring unit comprises a diamond-shaped wiring or a zigzag-shaped wiring.

14. The organic light emitting display device of claim 1, wherein the display unit includes an organic light-emitting element and a thin-film transistor including a gate electrode, a source electrode, and a drain electrode, and wherein at least one of the first alignment key and the second alignment key is made of a same material as the source electrode and the drain electrode or is made of a same material of the gate electrode.

15. The organic light emitting display device of claim 1, further comprising:

an insulating layer formed on the flexible substrate;

wherein the first alignment key and the second alignment key are formed on the insulating layer.

16. The organic light emitting display device of claim 15, wherein the insulating layer includes at least one of a buffer layer formed on the flexible substrate, a gate insulating layer formed on the buffer layer, and an interlayer insulating layer formed on the gate insulation layer.

17. The organic light emitting display device of claim 1, further comprising:

a sealing layer covering the display unit and the first alignment key.

18. The organic light emitting display device of claim 1, wherein the display unit and the pad unit are formed on a first surface of the flexible substrate, and the organic light emitting display device further comprises:

a first film formed in the first area on a second surface of the flexible substrate that is opposite the first surface of the flexible substrate;

a second film formed in the second area of the second surface of the flexible substrate; and

wherein the first alignment key and the second alignment key are formed in an area not including the first film and second film.

2. The organic light-emitting display device of claim 2, wherein the first alignment key is located in the first area and the second alignment key is located in the second area.

19. An organic light-emitting display device comprising:

a flexible substrate, the flexible substrate including a first area, a first bending area adjacent to the first area, a second bending area adjacent to the first bending area, and a second area adjacent to the second bending area;

a display unit formed in the first area of the flexible substrate;

a pad unit formed in the second area of the flexible substrate;

a wiring unit configured to electrically connect together the display unit and the pad unit, the wiring unit formed across the first area, the first bending area, the second bending area, and the second area;

a first alignment key formed over the flexible substrate; and

a second alignment key formed over the flexible substrate,

wherein the first alignment key and the second alignment key are positioned to be symmetric with respect to a boundary between the first bending area and the second bending area.

20. The organic light-emitting display device of claim 19, wherein a distance from a center of the first alignment key to the boundary is substantially the same as a distance from a center of the second alignment key to the boundary.

21. A method for manufacturing an organic light-emitting display device, the method comprising:

providing a flexible substrate, the flexible substrate including a first area, a first bending area adjacent to the first area, a second bending area adjacent to the first bending area, and a second area adjacent to the second bending area, the flexible substrate further including a first alignment key formed over the flexible substrate and a second alignment key formed over the flexible substrate;

securing the flexible substrate to a stage;

bending the flexible substrate in the first bending area and the second bending area;

clamping the second area of the bent flexible substrate using a clamp;

aligning the first alignment key to overlap with the second alignment key by moving the stage or clamp until the first alignment key overlaps the second alignment key; and

pressing the substrate until the first area of the flexible substrate is in contact with the second area of the flexible substrate.