Flexible display device and method for fabricating the same

Patent metadata

Field	Value
Publication number	US-10217406-B2
Application number	US-201816110943-A
Country	US
Kind code	B2
Filing date	Aug 23, 2018
Priority date	Jul 31, 2015
Publication date	Feb 26, 2019
Grant date	Feb 26, 2019

Abstract

A flexible display device includes a flexible substrate includes first and second portions that overlap each other, and a bending portion connecting the first portion with the second portion. A first display having a first organic light emitting diode is on the first portion, the first display configured to display an image in a first direction, and a second display having a second organic light emitting diode is on the second portion, the second display configured to display an image in a second direction. A gate driver is on the bending portion, and is configured to drive gate lines in each of the first and second displays.

First claim

What is claimed is:

1. A flexible display device, comprising:
a flexible substrate including:
first and second portions that overlap each other, and
a bending portion connecting the first portion with the second portion;

a first display having a first organic light emitting diode on the first portion;
a second display having a second organic light emitting diode on the second portion;
a first gate driver on the bending portion, the first gate driver configured to drive gate lines in the first display; and
a second gate driver on the bending portion, the second gate driver configured to drive gate lines in the second display,
wherein the first gate driver and the second gate driver are provided in the bending portion between the first display and the second display, and are connected to a first and second driving circuit respectively.

2. The flexible display device of claim 1 , wherein the flexible substrate is bent based on a center line in the bending portion.

3. The flexible display device of claim 2 , wherein the center line in the bending portion is provided between the first gate driver and the second gate driver.

4. The flexible display device of claim 2 , wherein the first gate driver and the second gate driver are provided along with the center line in the bending portion.

5. The flexible display device of claim 1 , wherein the flexible substrate has a first and second side,
the first and second portions are provided along with the first side,
the bending portion is provided along with the second side, and
the first side is longer than the second side in the flexible substrate.

6. The flexible display device of claim 1 , wherein the first and second portions have the same shape and area as each other.

7. The flexible display device of claim 1 , wherein the first driving circuit is connected to one side of the first portion,
the first driving circuit is configured to supply a plurality of first driving signals to the first display and the first gate driver,
the second driving circuit is connected to one side of the second portion, and
the second driving circuit is configured to supply a plurality of second driving signals to the second display and the second gate driver.

8. The flexible display device of claim 7 , wherein a gap between the first driving circuit and the second driving circuit facing the first driving circuit is smaller than a gap between the first display and the second display.

9. The flexible display device of claim 7 , wherein a plurality of gate signal transmission lines for transmitting a plurality of gate control signals from the first and second driving circuits to the gate drivers are in the bending portion.

10. The flexible display device of claim 7 , wherein the first driving circuit includes a printed circuit board and a plurality of circuit films, and
the second driving circuit includes a printed circuit board and a plurality of circuit films.

11. The flexible display device of claim 10 , wherein a plurality of gate signal transmission lines for transmitting a plurality of gate control signals from the printed circuit board of the first driving circuit to the first gate driver is provided on one of the plurality of circuit films of the first driving circuit,
a plurality of gate signal transmission lines for transmitting a plurality of gate control signals from the printed circuit board of the second driving circuit to the second gate driver is provided on one of the plurality of circuit films of the second driving circuit, and
the one of the plurality of circuit film of the first driving circuit and the one of the plurality of circuit film of the second driving circuit are respectively provided in a region adjacent to a center line in the bending portion.

12. The flexible display device of claim 11 , wherein each of the plurality of gate signal transmission lines has at least one curved portion.

13. The flexible display device of claim 12 , wherein the plurality of gate signal transmission lines provided on the first portion and the plurality of gate signal transmission lines provided on the second portion are formed to be symmetric with respect to the center line.

14. The flexible display device of claim 1 , wherein a size of the first display and a size of the second display is same or different.

15. The flexible display device of claim 1 , wherein the first display includes:
a thin film transistor array disposed on the first portion;
a first organic light emitting diode deposited on the thin film transistor array; and
and an encapsulation layer covering the first organic light emitting diode, and
the second display includes:
a thin film transistor array disposed on the second portion;
a second organic light emitting diode deposited on the thin film transistor array; and
an encapsulation layer covering the second organic light emitting diode.

16. The flexible display device of claim 15 , wherein the encapsulation layer of the first display covers the first gate driver, and the encapsulation layer of the second display covers the second gate driver.

17. The flexible display device of claim 15 , wherein a polarizing film is provided on at least one of the encapsulation layers of the first and second displays.

18. The flexible display device of claim 7 , wherein the first display and the second display are provided on a first surface of the flexible substrate,
the first driving circuit and the second driving circuit are provided on a second surface of the flexible substrate, the first surface and the second surface being opposite to each other, and
when the first portion and the second portion overlaps each other, the first driving circuit and the second driving circuit are provided to face each other.

19. The flexible display device of claim 7 , wherein the first gate driver and the second gate driver is provided on a first surface of the flexible substrate,
the first driving circuit and the second driving circuit are provided on a second surface of the flexible substrate, and
the first surface and the second surface are opposite to each other.

20. The flexible display device of claim 10 , wherein one of the plurality of circuit film of the first driving circuit connected to a plurality of gate signal transmission lines is provided in a region adjacent to a center line in the bending portion, and
one of the plurality of circuit film of the second driving circuit connected to a plurality of gate signal transmission lines is provided in a region adjacent to a center line in the bending portion.

Assignees

• Lg Display Co Ltd

Inventors

• Lee Chanwoo
• Min Sungjoon
• Lee Kwonhyung
• Oh Yeonjun

Classifications

• G09G5/00

  Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators (image data processing or generation, in general G06T) · CPC title

• G09G2310/0283

  Arrangement of drivers for different directions of scanning · CPC title

• G09G3/3225 Primary

  using an active matrix · CPC title

• G09G2380/02

  Flexible displays · CPC title

• G09G2310/0221

  with use of split matrices (G09G3/3644 and G09G3/3666 take precedence) · CPC title