Cover window for touch screen panel formed with printing layer and method for forming printing layer on cover window for touch screen panel

Patent metadata

Field	Value
Publication number	US-10048784-B2
Application number	US-201515025887-A
Country	US
Kind code	B2
Filing date	May 14, 2015
Priority date	May 15, 2014
Publication date	Aug 14, 2018
Grant date	Aug 14, 2018

Abstract

The present invention provides a cover window for a touch screen panel, wherein a printing layer is formed at an edge of the transfer substrate film, and an area where the printing layer is not formed is removed from the transfer film, which forms a view area in the cover window substrate.

First claim

The invention claimed is:

1. A method for forming a printing layer on a cover window for a touch screen panel, the method comprising:
applying ink onto a transfer substrate film to form the printing layer;
thereafter forming a transfer film by forming an adhesive film layer on an upper portion of the transfer substrate film such that the printing layer is buried;
removing a predetermined area of the transfer film to define a view area;
attaching the transfer film to a cover window substrate such that the adhesive film layer contacts the cover window substrate thereabove; and
removing the transfer substrate film, transferring the printing layer to the cover window substrate through a medium of the adhesive film layer, and fabricating the cover window for touch screen panel by attaching the printing layer to the cover window substrate through a medium of the adhesive film layer while defining the view area.

2. The method for forming a printing layer on a cover window for a touch screen panel according to claim 1 , wherein a release film layer is formed on an upper portion of the adhesive film layer to protect the adhesive film layer, and the transfer film is attached after the release film layer is removed shortly before attaching the adhesive film layer to be in contact with the cover window substrate thereabove.

3. The method for forming a printing layer on a cover window for a touch screen panel according to claim 1 , wherein the printing layer is formed at an edge of the transfer substrate film, and an area where the printing layer is not formed is removed from the transfer film, which forms a view area in the cover window substrate.

4. The method for forming a printing layer on a cover window for a touch screen panel according to claim 1 ,
wherein the adhesive film layer has a thickness enforcing adhesive force which enables transfer of the printing layer by making adhesiveness between the adhesive film layer and the cover window substrate higher than adhesiveness between another separately prepared substrate and the printing layer, and the adhesive film layer is formed on the printing layer formed on the another separately prepared substrate and transferred,
wherein a thickness of the adhesive film layer is in a range of 10 μm to 100 μm, and
wherein a thickness of the printing layer is in a range of 5 μm to 75 μm.

5. The method for forming a printing layer on a cover window for a touch screen panel according to claim 1 , wherein the step of applying ink onto the transfer substrate film to form the printing layer includes forming an aperture area in the printing layer.

6. The method for forming printing layer on a cover window for a touch screen panel according to claim 1 , wherein a thickness of the adhesive film layer is 100 to 500% of a thickness of the printing layer.

Assignees

• Lg Chemical Ltd

Inventors

• Yoon Chan-Oh
• Kim Jang-Soon
• Lee Sle
• Yang Doo-Ho

Classifications

• G06F3/041 Primary

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• B41M5/00

  Duplicating or marking methods; Sheet materials for use therein (by using light-sensitive materials G03; electrography, magnetography G03G {; repeatedly usable boards or tablets for writing or drawing B43L1/00}) · CPC title

• B41M5/025

  by transferring ink from the master sheet · CPC title

• G06F2203/04103

  Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices · CPC title