Flexible display device with side crack protection structure and manufacturing method for the same

Patent metadata

Field	Value
Publication number	US-9544994-B2
Application number	US-201414474122-A
Country	US
Kind code	B2
Filing date	Aug 30, 2014
Priority date	Aug 30, 2014
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

There is provided a flexible display having a plurality of innovations configured to allow bending of a portion or portions to reduce apparent border size and/or utilize the side surface of an assembled flexible display.

First claim

What is claimed is:

1. A flexible display, comprising:
an active area having a plurality of pixels; and
a notched inactive area including a bend allowance section with a plurality of conductive line traces, wherein a buffer layer etched area is provided between a notched line and a conductive line trace that is closest to the notched line in the bend allowance section.

2. The flexible display of claim 1 , wherein the buffer layer etched area is extended to a first routing area between the bend allowance section and a chip-on-film (COF) area.

3. The flexible display of claim 1 , wherein the buffer layer etched area between the notched line and the closest conductive line trace in the bend allowance section is provided with a stripe of buffer layer spaced apart from the closest conductive line trace.

4. The flexible display of claim 3 , wherein the buffer layer etched area including the stripe of buffer layer is extended to a first routing area between the bend allowance section and a chip-on-film (COF) area.

5. The flexible display of claim 1 , further comprising:
an auxiliary conductive line provided between the buffer layer etched area and the closest conductive line trace in the bend allowance section, wherein the auxiliary conductive line has a strain reduction pattern.

6. The flexible display of claim 5 , wherein the auxiliary conductive line is spaced apart from the immediately adjacent conductive line trace in the bend allowance section.

7. The flexible display of claim 5 , wherein the auxiliary conductive line is in contact with the immediately adjacent conductive line trace in the bend allowance section.

8. The flexible display of claim 5 , wherein the auxiliary conductive line in the bend allowance section is extended into a first routing area between the bend allowance section and a chip-on-film (COF) area.

9. The flexible display of claim 1 , further comprising:
a first routing area between the bend allowance section and a chip-on-film (COF) area, the first routing area having the plurality of conductive line traces extended between the bend allowance section and the chip-on-film (COF) area; and
a second routing area between the bend allowance section and the active area, the second routing area having the plurality of conductive line traces extended between the bend allowance section and the active area, wherein a recessed area is in between the adjacent conductive line traces in the first and second routing areas.

10. The flexible display of claim 1 , further comprising:
a gate-in-panel (GIP) in a side inactive area; and
a recessed channel provided between an outer edge of the side inactive area and the GIP.

11. The flexible display of claim 1 , further comprising:
a gate-in-panel (GIP) in a side inactive area; and
a floating metal trace with a strain reducing pattern provided between an outer edge of the side inactive area and the GIP.

12. The flexible display of claim 1 , wherein a base layer is exposed on at least some portion of the buffer layer etched area.

13. The flexible display of claim 12 , wherein crack propagation from the notched line towards the conductive line traces is suppressed due to the buffer layer etched area.

14. The flexible display of claim 12 , further comprising:
a shield metal layer under a semiconductor layer of TFTs in order to protect the TFTs near the buffer layer etched area.

15. The flexible display of claim 3 , wherein the stripe of buffer layer is configured to act as a dam for inhibiting moisture or foreign materials from reaching the conductive line traces.

16. The flexible display of claim 3 , wherein the buffer layer etched area has a portion without any inorganic buffer layer from the notched line to the stripe of buffer layer.

17. The flexible display of claim 5 , wherein the auxiliary conductive line is configured to have segments such that portions of a passivation layer on the auxiliary conductive line and portions of the buffer layer under the auxiliary conductive line are separated to suppress propagation of cracks or breaks.

18. The flexible display of claim 10 , wherein the recessed channel results from at least one or more insulation layers being etched.

19. The flexible display of claim 11 , wherein the strain reducing pattern is configured to divert cracks or breaks from propagating towards the GIP.

20. The flexible display of claim 19 , wherein the strain reducing pattern includes a diamond trace design, and the cracks or breaks are suppressed due to an angle of the diamond trace design.

Assignees

• Lg Display Co Ltd

Inventors

• Kwon Seyeoul
• Yang Heeseok
• Youn Sangcheon

Classifications

• G02F2201/122

  having a particular pattern · CPC title

• H05K1/189

  characterised by the use of flexible or folded printed circuits · CPC title

• G02F1/13452

  Conductors connecting driver circuitry and terminals of panels · CPC title

• H05K2201/09036

  Recesses or grooves in insulating substrate · CPC title

• G02F2201/50

  Protective arrangements · CPC title