Bendable articles including adhesive layer with a dynamic elastic modulus

Patent metadata

Field	Value
Publication number	US-12241007-B2
Application number	US-202017637298-A
Country	US
Kind code	B2
Filing date	Aug 12, 2020
Priority date	Aug 28, 2019
Publication date	Mar 4, 2025
Grant date	Mar 4, 2025

Abstract

Articles including a substrate, a cover glass layer disposed over a top surface of the substrate, and an adhesive layer having a dynamic elastic modulus disposed between a bottom surface of the cover glass layer and the top surface of the substrate. The cover glass layer may have a thickness in the range of 1 micron to 200 microns. The dynamic elastic modulus of the adhesive layer may include a first elastic modulus in the range of 10 kPa to 1000 kPa measured at a stress frequency in the range of 0 Hertz to 5 Hertz and a temperature of 23 degrees C., and a second elastic modulus of 500 MPa or more measured at a stress frequency in the range of 10 Hertz to 1000 Hertz and a temperature of 23 degrees C. The adhesive layer may be optically transparent. The articles may be bendable electronic display devices or bendable electronic display device modules.

First claim

What is claimed is:

1. An article comprising:
a substrate;
a cover glass layer disposed over a top surface of the substrate, the cover glass layer comprising a thickness in a range of 1 micron to 200 microns; and
an adhesive layer disposed between a bottom surface of the cover glass layer and the top surface of the substrate, the adhesive layer comprising a dynamic elastic modulus comprising:
a first elastic modulus in a range of 10 kPa to 1000 kPa measured at a stress frequency in a range of 0 Hertz to 5 Hertz and a temperature of 23 degrees C., and
a second elastic modulus of 500 MPa or more measured at a stress frequency in a range of 10 Hertz to 1000 Hertz and a temperature of 23 degrees C.

2. The article of claim 1 , wherein the second elastic modulus is in a range of 500 MPa to 10 GPa.

3. The article of claim 1 , wherein the first elastic modulus is in a range of 10 kPa to 1000 kPa across the stress frequency range of 0 Hertz to 5 Hertz.

4. The article of claim 1 , wherein the adhesive layer is optically transparent.

5. The article of claim 1 , wherein the cover glass layer comprises a thickness in a range of 1 micron to 125 microns.

6. The article of claim 1 , wherein the cover glass layer is directly bonded to the top surface of the substrate with the adhesive layer.

7. The article of claim 1 , wherein the adhesive layer comprises a viscoelastic material.

8. The article of claim 1 , wherein the adhesive layer comprises a shear thickening material.

9. The article of claim 8 , wherein the shear thickening material comprises colloidal nanoparticles dispersed in a solution, and wherein an average particle size of the colloidal nanoparticles is 200 nanometers or less.

10. The article of claim 9 , wherein the colloidal nanoparticles comprise a first refractive index and the solution comprises a second refractive index, and a difference between the first refractive index and the second refractive index is 0.02 or less.

11. The article of claim 1 , wherein the substrate comprises an electronic display comprising a display surface defining at least a portion of the top surface of the substrate.

12. The article of claim 1 , further comprising a coating layer disposed on a top surface of the cover glass layer, wherein the coating layer comprises at least one of an anti-reflection coating layer, an anti-glare coating layer, an anti-fingerprint coating layer, an anti-microbial coating layer, or an easy-to-clean coating layer.

13. The article of claim 1 , wherein at least one of a top surface or the bottom surface of the cover glass layer comprises a compressive stress, and a concentration of metal oxide through a thickness of the cover glass layer is different at two or more points.

14. The article of claim 1 , further comprising:
a housing comprising a front surface, a back surface and side surfaces; and
electrical components at least partially within the housing, the electrical components comprising a controller, a memory, and an electronic display, the electronic display at or adjacent the front surface of the housing,
wherein the cover glass layer forms at least a portion of the housing.

15. An electronic display component, comprising:
an electronic display comprising a display surface;
a cover glass layer disposed over the display surface, the cover glass layer comprising a thickness in a range of 1 micron to 200 microns; and
an optically transparent adhesive layer disposed between a bottom surface of the cover glass layer and the display surface of the electronic display, the adhesive layer comprising a dynamic elastic modulus comprising:
a first elastic modulus in a range of 10 kPa to 1000 kPa measured at a stress frequency in a range of 0 Hertz to 5 Hertz and a temperature of 23 degrees C., and
a second elastic modulus of 500 MPa or more measured at a stress frequency in a range of 10 Hertz to 1000 Hertz and a temperature of 23 degrees C.

16. The electronic display component of claim 15 , wherein the optically transparent adhesive layer comprises a viscoelastic material.

17. The electronic display component of claim 15 , wherein the optically transparent adhesive layer comprises a shear thickening material.

18. The electronic display component of claim 15 , wherein the optically transparent adhesive layer comprises a thickness in a range of 25 microns to 75 microns.

19. A method of making an electronic display component, the method comprising:
disposing an optically transparent adhesive layer between a top, user-facing surface of an electronic display and a bottom surface of a glass layer, the glass layer comprising a top, user-facing surface opposite the bottom surface and a thickness in a range of 1 micron to 200 microns, and
wherein the adhesive layer comprises a dynamic elastic modulus comprising:
a first elastic modulus in a range of 10 kPa to 1000 kPa measured at a stress frequency in a range of 0 Hertz to 5 Hertz and a temperature of 23 degrees C., and
a second elastic modulus of 500 MPa or more measured at a stress frequency in a range of 10 Hertz to 1000 Hertz and a temperature of 23 degrees C.

Assignees

• Corning Inc

Inventors

• Baby Shinu
• Chen Naigeng
• Fewkes Edward John
• Joshi Dhananjay
• Kittleson Andrew Peter
• Qaroush Yousef Kayed
• Zhang Ying

Classifications

• B32B2307/412

  Transparent · CPC title

• B32B2307/51

  Elastic · CPC title

• C09J2301/30

  characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier · CPC title

• B32B2457/20

  Displays, e.g. liquid crystal displays, plasma displays · CPC title

• H10K77/111

  Flexible substrates · CPC title