Protective display film with glass

Patent metadata

Field	Value
Publication number	US-11577492-B2
Application number	US-201716335537-A
Country	US
Kind code	B2
Filing date	Sep 21, 2017
Priority date	Sep 21, 2016
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A display film includes a transparent glass layer having a thickness of 250 micrometers or less, or in a range from 25 to 100 micrometers. A transparent energy dissipation layer is fixed to the transparent glass layer. The transparent energy dissipation layer has a glass transition temperature of 27 degrees Celsius or less, a Tan Delta peak value of 0.5 or greater, or from 1 to 2 and a Young's Modulus (E′) greater than 0.9 MPa over a temperature range of −40 degrees Celsius to 70 degrees Celsius. In a preferred embodiment, the transparent energy dissipation layer comprises a cross-linked polyurethane layer or a cross-linked polyurethane acrylate layer.

First claim

What is claimed is:

1. A display film comprising:
a transparent glass layer having a thickness of 250 micrometers or less; and
a transparent energy dissipation layer fixed to the transparent glass layer, the transparent energy dissipation layer comprising a cross-linked polyurethane and having a glass transition temperature of 27 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater, and a Young's Modulus (E′) greater than 0.9 MPa over a temperature range of −40 degrees Celsius to 70 degrees Celsius,
wherein the display film has a haze of 2.0% or less.

2. The display film according to claim 1 , wherein the transparent energy dissipation layer comprises a cross-linked polyurethane acrylate layer.

3. The display film according to claim 1 , wherein the transparent energy dissipation layer has a glass transition temperature of 10 degrees Celsius or less.

4. The display film according to claim 1 , wherein the transparent energy dissipation layer has a thickness in a range from 20 to 200 micrometers.

5. The display film according to claim 1 , wherein the transparent energy dissipation layer is directly fixed to the transparent glass layer.

6. The display film according to claim 1 , wherein the transparent energy dissipation layer is fixed to the transparent glass layer by an intermediate adhesive layer.

7. The display film according to claim 6 , wherein the intermediate adhesive layer has a shear modulus value of 40 MPa or greater.

8. The display film according to claim 1 , further comprising a protective layer fixed to the transparent glass layer, and the transparent glass layer separates the transparent energy dissipation layer from the protective layer.

9. The display film according to claim 8 , further comprising an optically clear adhesive layer separating the protective layer from the transparent glass layer.

10. The display film according to claim 1 , further comprising a coupling layer disposed on the transparent energy dissipation layer, and the transparent energy dissipation layer separates the coupling layer from the transparent glass layer, the coupling layer having a shear modulus of 200 kPa or less over a temperature range from −40 degrees Celsius to 70 degrees Celsius.

11. The display film according to claim 10 , further comprising a release liner contacting the coupling layer.

12. The display film according to claim 1 , wherein the transparent energy dissipation layer has a Tan Delta peak value of 0.5 or greater, and the transparent energy dissipation layer has a cross-link density in a range from 0.1 to 1.0 mol/kg.

13. The display film according to claim 1 , wherein the display film has a visible light transmission of 85% or greater.

14. The display film according to claim 8 , wherein the protective layer comprises nanoparticles and has a thickness in a range from 2 to 30 micrometers.

15. The display film according to claim 1 , wherein the display film has a thickness in a range from 30 to 300 micrometers.

16. A display film comprising:
a transparent glass layer having a thickness of 250 micrometers or less;
a transparent energy dissipation layer fixed to the transparent glass layer, the transparent energy dissipation layer comprising a cross-linked polyurethane and having a glass transition temperature of 27 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater, and a Young's Modulus (E′) greater than 0.9 MPa over the temperature range of −40 degrees Celsius to 70 degrees Celsius; and
a protective layer fixed to the transparent glass layer, the transparent glass layer separates the transparent energy dissipation layer from the protective layer,
wherein the display film has a haze of 2.0% or less.

17. The display film according to claim 16 , further comprising a coupling layer disposed on the transparent energy dissipation layer, the transparent energy dissipation layer separates the coupling layer from the transparent glass layer.

18. The display film according to claim 17 , further comprising a release liner contacting the coupling layer.

19. A display film comprising:
a transparent glass layer having a thickness of 250 micrometers or less;
a transparent energy dissipation layer fixed to the transparent glass layer, the transparent energy dissipation layer comprising a crosslinked polyurethane and has a glass transition temperature of 27 degrees Celsius or less, a Tan Delta peak value of 0.5 or greater, and a Young's Modulus (E′) greater than 0.9 MPa over the temperature range of −40 degrees Celsius to 70 degrees Celsius;
an optically clear adhesive layer disposed on the transparent glass layer; and
a protective layer disposed on the optically clear adhesive layer, and the optically clear adhesive layer separates the transparent energy dissipation layer from the protective layer,
wherein the display film has a haze of 2.0% or less.

20. The display film according to claim 19 , further comprising a coupling layer disposed on the transparent energy dissipation layer, the transparent energy dissipation layer separates the coupling layer from the transparent glass layer.

21. The display film according to claim 20 , further comprising a release liner contacting the coupling layer.

22. A flexible display comprising the display film according to claim 1 , 16 or 19 coupled to a display element of an optical display.

23. The flexible display according to claim 22 , wherein the display element is an OLED element.

24. A display film comprising:
a transparent glass layer having a thickness of 250 micrometers or less; and
a transparent energy dissipation layer having a thickness in a range from 20 to 200 micrometers fixed to the transparent glass layer by an adhesive layer having a shear modulus value of 40 MPa or greater, the transparent energy dissipation layer comprising a cross-linked polyurethane and having a glass transition temperature of 10 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater, and a cross-link density in a range from 0.1 to 1.0 mol/kg;
a protective layer having a thickness in a range from 2 to 30 micrometers fixed to the transparent glass layer, wherein the transparent glass layer separates the transparent energy dissipation layer from the protective layer;
an optically clear adhesive layer separating the protective layer from the transparent glass layer;
a coupling layer disposed on the transparent energy dissipation layer, and the transparent energy dissipation layer separates the coupling layer from the transparent glass layer, the coupling layer having a shear modulus of 200 kPa or less over a temperature range from −40 degrees Celsius to 70 degrees Celsius;
a release liner contacting the coupling layer; and
wherein the display film has a haze of 2.0% or less and a visible light transmission of 85% or greater.

Assignees

• 3M Innovative Properties Company

Inventors

• Woody V Joseph W
• Thompson David Scott
• Leatherdale Catherine A
• Braun Ryan M
• Johnson Michael A
• Solomonson Steven D
• Stradinger John J
• Pekurovsky Lyudmila A
• Rule Joseph D
• Condo Peter D

Classifications

• H10K59/00

  Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00 · CPC title

• H10K59/873

  Encapsulations · CPC title

• H10K2102/311

  Flexible OLED · CPC title

• H10K77/111

  Flexible substrates · CPC title

• H10K50/844

  Encapsulations · CPC title