Display apparatus having protective layer on the pad unit and method of fabricating the same

Patent metadata

Field	Value
Publication number	US-10285278-B2
Application number	US-201414320956-A
Country	US
Kind code	B2
Filing date	Jul 1, 2014
Priority date	Sep 13, 2013
Publication date	May 7, 2019
Grant date	May 7, 2019

Abstract

A display apparatus may include a substrate, a pad unit on the substrate, a display panel on the substrate, an encapsulation layer covering the display panel, and a protective layer on the pad unit. The protective layer may have an elastic coefficient ranging from about 10 MPa to about 200 GPa.

First claim

What is claimed is:

1. A display apparatus, comprising:
a substrate;
a pad unit on the substrate, the pad unit including:
a pad electrode on the substrate; and
a flexible printed circuit board on the pad electrode, the flexible printed circuit board being electrically connected to the pad electrode;
a display panel on the substrate;
an encapsulation layer covering the display panel and a portion of the pad electrode; and
a protective layer on the pad unit, the protective layer covering a region of the pad electrode and at least a portion of a region of the flexible printed circuit board, the protective layer having an elastic coefficient ranging from 10 MPa to 200 GPa, the protective layer including:
an organic layer on the pad unit, and
a first pattern on the organic layer, the organic layer being interposed between the pad unit and the first pattern,
wherein:
the organic layer includes an organic material that includes at least one of a cyclic olefin copolymer (COC), a poly(methyl methacrylate) (PMMA), a polycarbonate (PC), a cyclo olefin polymer (COP), a liquid crystal polymer (LCP), a polydimethyl siloxane (PDMS), a polyamide (PA), a polyethylene (PE), a polyimide (PI), a polypropylene (PP), a polyphenylene ether (PPE), a polystyrene (PS), polyoxymethylene (POM), a polyetheretherketone (PEEK), a polyethylene terephthalate (PET), a polytetrafluoroethylene (PTFE), a polyvinylchloride (PVC), a polyvinylidene fluoride (PVDF), a polybutylene terephthalate (PBT), a fluorinated ethylene propylene (FEP), or a tetrafluoroethylene (PFA), and
the first pattern includes an organic material having an elastic coefficient less than the elastic coefficient of the organic material of the organic layer.

2. The display apparatus as claimed in claim 1 , wherein the protective layer further includes an inorganic material or a metal material.

3. The display apparatus as claimed in claim 2 , wherein the inorganic material is a carbon film, silicon carbide, or an oxide-based material.

4. The display apparatus as claimed in claim 2 , wherein the metal material is tungsten or tungsten carbide.

5. The display apparatus as claimed in claim 1 , wherein the protective layer includes an organic layer including an organic material, a metal layer on the organic layer, and an inorganic layer on the metal layer.

6. The display apparatus as claimed in claim 1 , wherein the protective layer includes at least one organic layer, at least one metal layer, and at least one inorganic layer that are alternately stacked.

7. The display apparatus as claimed in claim 1 , wherein the first pattern includes a cyclic olefin copolymer (COC), a poly(methyl methacrylate) (PMMA), a polycarbonate (PC), a cyclo olefin polymer (COP), a liquid crystal polymer (LCP), a polydimethyl siloxane (PDMS), a polyamide (PA), a polyethylene (PE), a polyimide (PI), a polypropylene (PP), a polyphenylene ether (PPE), a polystyrene (PS), polyoxymethylene (POM), a polyetheretherketone (PEEK), a polyethylene terephthalate (PET), a polytetrafluoroethylene (PTFE), a polyvinylchloride (PVC), a polyvinylidene fluoride (PVDF), a polybutylene terephthalate (PBT), a fluorinated ethylene propylene (FEP), a tetrafluoroethylene (PFA), or a mixture thereof.

8. The display apparatus as claimed in claim 1 , wherein the first pattern has a trapezoidal or triangular shape in section.

9. The display apparatus as claimed in claim 1 , further comprising a planarization layer on the organic layer, the planarization layer covering the first pattern.

10. The display apparatus as claimed in claim 9 , wherein the planarization layer includes a liquid phase resin, the liquid phase resin having an elastic coefficient less than an elastic coefficient of the first pattern.

11. The display apparatus as claimed in claim 9 , further comprising a second pattern on the protective layer, wherein the second pattern includes a cyclic olefin copolymer (COC), a poly(methyl methacrylate) (PMMA), a polycarbonate (PC), cyclo olefin polymer (COP), a liquid crystal polymer (LCP), a polydimethyl siloxane (PDMS), a polyamide (PA), a polyethylene (PE), a polyimide (PI), a polypropylene (PP), a polyphenylene ether (PPE), a polystyrene (PS), a polyoxymethylene (POM), a polyetheretherketone (PEEK), a polyethylene terephthalate (PET), a polytetrafluoroethylene (PTFE), a polyvinylchloride (PVC), a polyvinylidene fluoride (PVDF), a polybutylene terephthalate (PBT), a fluorinated ethylene propylene (FEP), a tetrafluoroethylene (PFA), or a mixture thereof.

12. The display apparatus as claimed in claim 1 , wherein the display panel includes a plurality of organic light-emitting display devices (OLEDs) spaced apart from each other in a display area of the display panel.

13. A method of fabricating a display device, the method comprising:
providing a substrate:
forming a display panel on a display region of the substrate;
forming a pad unit on the substrate, the pad unit including:
a pad electrode on the substrate; and
a flexible printed circuit board on the pad electrode, the flexible printed circuit board being electrically connected to the pad electrode;

forming an encapsulation layer covering the display panel and part of the pad electrode; and
forming a protective layer on the pad unit, the protective layer covering a region of the pad electrode and a region of the flexible printed circuit board, wherein the protective layer has an elastic coefficient ranging from about 10 MPa to about 200 GPa, the protective layer including:
an organic layer on the pad unit, and
a first pattern on the organic layer, the organic layer being interposed between the pad unit and the first pattern, wherein:
the organic layer includes an organic material that includes at least one of a cyclic olefin copolymer (COC), a poly(methyl methacrylate) (PMMA), a polycarbonate (PC), a cyclo olefin polymer (COP), a liquid crystal polymer (TCP), a polydimethyl siloxane (PDMS), a polyamide (PA), a polyethylene (PE), a polyimide (PI), a polypropylene (PP), a polyphenylene ether (PPE), a polystyrene (PS), polyoxymethylene (POM), a polyetheretherketone (PEEK), a polyethylene terephthalate (PET), a polytetrafluoroethylene (PTFE), a polyvinylchloride (PVC), a polyvinylidene fluoride (PVDF), a polybutylene terephthalate (PBT), a fluorinated ethylene propylene (FEP), or a tetrafluoroethylene (PFA), and
the first pattern includes an organic material having an elastic coefficient less than the elastic coefficient of the organic material of the organic layer.

14. The method as claimed in claim 13 , wherein forming the protective layer includes using an adhesive on the pad electrode.

15. The method as claimed in claim 13 , wherein forming the protective layer includes using a liquid phase resin on the pad electrode.

16. The method as claimed in claim 13 , wherein the encapsulation layer includes an organic material, an inorganic material, or a metal material.

Assignees

• Samsung Display Co Ltd

Inventors

• Namkung Jun
• Park Soon-Ryong
• Seong Ju-Yeop
• So Jung-Ho
• Jeon Eun-Yong
• Baek Seok-Gi
• Kim Kwang-Hyeok
• Jeong Chul-Woo

Classifications

• H05K3/28 Primary

  Applying non-metallic protective coatings {(H05K3/0091 takes precedence; methods for intermediate insulating layers for build-up multilayer circuits H05K3/4673)} · CPC title

• H05K3/361

  Assembling flexible printed circuits with other printed circuits · CPC title

• H05K2201/10128

  Display · CPC title

• H05K2201/0175

  Inorganic, non-metallic layer, e.g. resist or dielectric for printed capacitor · CPC title

• G09F9/00 Primary

  Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) · CPC title