Method for printing touch panel cover glass and touch panel cover glass manufactured by using same

Patent metadata

Field	Value
Publication number	US-10877603-B2
Application number	US-201615757215-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Nov 27, 2015
Publication date	Dec 29, 2020
Grant date	Dec 29, 2020

Abstract

The present invention relates to a method for printing touch panel cover glass and a touch panel cover glass manufactured by using the same, the method comprising the steps of: a) inkjet-printing both black ink for a bezel and infrared-transmissive ink on a glass by using two or more inkjet heads; and b) forming a bezel layer and an infrared-transmissive layer by curing the substrate, wherein a gap between the inkjet-printed black ink for a bezel and infrared-transmissive ink printed in the step a) is 1 μm to 500 μm.

First claim

The invention claimed is:

1. A method for printing a touch panel cover glass, comprising the steps of:
a) simultaneously inkjet-printing both a black ink for a bezel and an infrared-transmissive ink on a glass by using two or more inkjet heads, wherein:
a gap between the inkjet-printed black ink for a bezel and the infrared-transmissive ink is 1 μm to 500 μm;
the black ink for a bezel comprises a black pigment, an oligomer, a multifunctional monomer, a 1- to 3-functional monomer, an adhesive enhancer, a polymerization inhibitor, and a surfactant, wherein the black pigment is at least one of carbon black and titanium black, and the black ink has a surface tension of 18 N/m to 40 N/m at 25° C.; and
the infrared-transmissive ink comprises a black pigment, an oligomer, a multifunctional monomer, a 1- to 3-functional monomer, an adhesive enhancer, a polymerization inhibitor, and a surfactant, wherein the black pigment is at least one of lactam black and perylene black, and the infrared-transmissive ink has a surface tension of 18 N/m to 40 N/m at 25° C.; and

b) forming a bezel layer and an infrared-transmissive layer by curing the substrate by irradiating with UV light at an intensity of from 1000 mJ/cm 2 to 20000 mJ/cm 2 ,
wherein the gap between the inkjet-printed black ink for a bezel and the infrared-transmissive ink is maintained after curing to yield the touch panel cover glass that includes the gap between the inkjet-printed black ink for a bezel and the infrared-transmissive ink, and
wherein the surface hardness of the bezel layer cured in the step b) is 4H or higher.

2. The method for printing a touch panel cover glass according to claim 1 , wherein the gap between the inkjet-printed black ink for a bezel and infrared-transmissive ink printed in the step a) is 10 μm to 100 μm.

3. The method for printing a touch panel cover glass according to claim 1 , wherein:
the thickness of the bezel layer cured in the step b) is 2 μm to 10 μm; and
the thickness of the infrared-transmissive layer cured in the step b) is 2 μm to 10 μm.

4. The method for printing a touch panel cover glass according to claim 1 , wherein the optical density of the bezel layer cured in the step b) is 4 to 6.

5. The method for printing a touch panel cover glass according to claim 1 , wherein the transmissivity of the infrared-transmissive layer cured in the step b) in an infrared wavelength region is 80% or higher.

6. The method for printing a touch panel cover glass according to claim 1 , wherein the transmissivity of the infrared-transmissive layer cured in the step b) in a visible light wavelength region is 20% or lower.

7. The method for printing a touch panel cover glass according to claim 1 , further comprising heating the cured bezel layer and cured infrared-transmissive layer at a temperature in a range of 150° C. to 220° C. and for a period of time in the range of from 10 min to 30 min to enhance adhesion to the glass.

Assignees

• Lg Chemical Ltd

Inventors

• Yoo Jae-Hyun
• Kim Mi-Kyoung
• Kim Joon-Hyung

Classifications

• G06F2203/04103

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

• G06F3/042 Primary

  by opto-electronic means · CPC title

• G02F1/133331

  Cover glasses · CPC title

• G06F2203/04108

  Touchless 2D- digitiser, i.e. digitiser detecting the X/Y position of the input means, finger or stylus, also when it does not touch, but is proximate to the digitiser's interaction surface without distance measurement in the Z direction · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title