Flexible display device and method of manufacturing the same

Patent metadata

Field	Value
Publication number	US-2020020869-A1
Application number	US-201916404058-A
Country	US
Kind code	A1
Filing date	May 6, 2019
Priority date	Jul 11, 2018
Publication date	Jan 16, 2020
Grant date	—

Abstract

A method of manufacturing a flexible display device including preparing a support substrate, forming a first adhesive layer having a positive charge on the support substrate, the first adhesive layer including a polymer electrolyte and a graphene oxide, forming a second adhesive layer having a negative charge on the first adhesive layer, the second adhesive layer including a graphene oxide, forming a flexible substrate on the second adhesive layer, forming a display unit on the flexible substrate, and separating the support substrate and the flexible substrate.

First claim

What is claimed is:

1 . A method of manufacturing a flexible display device, the method comprising:
preparing a support substrate; forming a first adhesive layer having a positive charge on the support substrate, the first adhesive layer including a polymer electrolyte and a graphene oxide; forming a second adhesive layer having a negative charge on the first adhesive layer, the second adhesive layer including a graphene oxide; forming a flexible substrate on the second adhesive layer; forming a display unit on the flexible substrate; and separating the support substrate and the flexible substrate.

2 . The method as claimed in claim 1 , wherein the support substrate is at least one of a glass substrate, a polymer film, and a silicon wafer.

3 . The method as claimed in claim 1 , wherein preparing the support substrate includes processing a surface of the support substrate to have a negative charge.

4 . The method as claimed in claim 1 , wherein the polymer electrolyte is at least one of poly(diallyldimethylammonium chloride) (PDDA), poly(ethylene imine) (PEI), poly(amic acid) (PAA), poly(styrene sulfonate) (PSS), poly(allyl amine) (PAA), chitosan (CS), poly(N-isopropyl acrylamide) (PNIPAM), poly(vinyl sulfate) (PVS), poly(allylamine) (PAH), and poly(methacrylic acid) (PMA).

5 . The method as claimed in claim 1 , wherein forming the first adhesive layer includes:
preparing a first adhesive solution having a positive charge; coating the first adhesive solution onto the support substrate; and drying the support substrate on which the first adhesive solution is coated.

6 . The method as claimed in claim 5 , wherein preparing the first adhesive solution includes mixing a polymer electrolyte solution and a graphene oxide solution.

7 . The method as claimed in claim 6 , wherein:
the polymer electrolyte solution has a positive charge; and the graphene oxide solution has a positive charge or a neutral charge.

8 . The method as claimed in claim 5 , wherein forming the second adhesive layer includes:
coating a second adhesive solution having a negative charge on the first adhesive layer; and drying the first adhesive layer on which the second adhesive solution is coated.

9 . The method as claimed in claim 8 , wherein preparing the first adhesive solution includes mixing the second adhesive solution and a polymer electrolyte solution.

10 . The method as claimed in claim 1 , further comprising, after forming the second adhesive layer and before forming the flexible substrate:
forming a third adhesive layer having a positive charge on the second adhesive layer; and forming a fourth adhesive layer having a negative charge on the third adhesive layer, the fourth adhesive layer including a graphene oxide.

11 . The method as claimed in claim 10 , wherein the third adhesive layer includes a polymer electrolyte and a graphene oxide.

12 . The method as claimed in claim 10 , wherein the third adhesive layer includes a graphene oxide.

13 . The method as claimed in claim 1 , wherein separating the support substrate and the flexible substrate includes separating the first adhesive layer and the second adhesive layer from each other.

14 . The method as claimed in claim 1 , wherein separating the support substrate and the flexible substrate includes separating the support substrate and the flexible substrate by using a peeling force.

15 . The method as claimed in claim 1 , further comprising forming an encapsulation layer on the display unit.

16 . A flexible display device, comprising:
a flexible substrate; at least one adhesive layer having an electrical charge on a first surface of the flexible substrate, the at least one adhesive layer including a polymer electrolyte and a graphene oxide; a display unit on a second surface of the flexible substrate; and an encapsulation layer covering the display unit.

17 . The flexible display device as claimed in claim 16 , wherein the flexible substrate includes at least one of polyester, polyvinyl, polycarbonate, polyethylene, polyacetate, polyimide, polyethersulfone (PES), polyacrylate (PAR), polyethylene naphthalate (PEN), and polyethylene terephthalate (PET).

18 . The flexible display device as claimed in claim 16 , wherein the polymer electrolyte is at least one of poly(diallyldimethylammonium chloride) (PDDA), poly(ethylene imine) (PEI), poly(amic acid) (PAA), poly(styrene sulfonate) (PSS), poly(allyl amine) (PAA), chitosan (CS), poly(N-isopropyl acrylamide) (PNIPAM), poly(vinyl sulfate) (PVS), poly(allylamine) (PAH), and poly(methacrylic acid) (PMA).

19 . The flexible display device as claimed in claim 16 , wherein the at least one adhesive layer includes:
a first adhesive layer having a positive charge, the first adhesive layer including a polymer electrolyte and a graphene oxide; and a second adhesive layer having a negative charge, the second adhesive layer being between the first adhesive layer and the flexible substrate, and the second adhesive layer including a graphene oxide.

20 . The flexible display device as claimed in claim 16 , wherein the display unit includes:
a pixel circuit layer on the flexible substrate, the pixel circuit layer including a thin film transistor; and an emission layer on the pixel circuit layer, the emission layer including an organic light emitting diode.

Assignees

• Samsung Display Co Ltd

Inventors

• Kang Byunghoon
• Moon Seung Jun
• Seo Dongkyun
• Shin Hee Kyun
• Sim Junho
• Cho Woo Jin

Classifications

• H01L51/0097 Primary

  Electricity · mapped topic

• H01L2251/5323

  Electricity · mapped topic

• H01L51/5253

  Electricity · mapped topic

• H01L51/56

  Electricity · mapped topic

• H01L27/3244

  Electricity · mapped topic