Bendable glass stack assemblies, articles and methods of making the same

Patent metadata

Field	Value
Publication number	US-12447720-B2
Application number	US-202318229921-A
Country	US
Kind code	B2
Filing date	Aug 3, 2023
Priority date	Jan 29, 2014
Publication date	Oct 21, 2025
Grant date	Oct 21, 2025

Abstract

A glass element having a thickness from 25 μm to 125 μm, a first primary surface, a second primary surface, and a compressive stress region extending from the first primary surface to a first depth, the region defined by a compressive stress σI of at least about 100 MPa at the first primary surface. Further, the glass element has a stress profile such that it does not fail when it is subject to 200,000 cycles of bending to a target bend radius of from 1 mm to 20 mm, by the parallel plate method. Still further, the glass element has a puncture resistance of greater than about 1.5 kgf when the first primary surface of the glass element is loaded with a tungsten carbide ball having a diameter of 1.5 mm.

First claim

What is claimed is:

1. A glass article, comprising:
a display,
a cover glass layer disposed over the display and comprising:
a thickness in the range of 1 micron to 50 microns, and
a glass material having an elastic modulus less than or equal to 73.6 gigapascals, wherein the glass material comprises: 64 mol % to 69 mol % SiO 2 , and 5 mol % to 12 mol % Al 2 O 3 , and

a glass structure having a thickness greater than the thickness of the glass layer, wherein the glass layer is arranged in a central region of the glass structure between parallel edges of the glass structure.

2. The glass article of claim 1 , wherein the glass material comprises an elastic modulus in the range of 50 gigapascals to 73.6 gigapascals.

3. The glass article of claim 1 , wherein the glass material comprises an elastic modulus in the range of 57.4 gigapascals to 73.6 gigapascals.

4. The glass article of claim 1 , wherein the glass material comprises an alkali-containing glass composition.

5. The glass article of claim 1 , wherein the glass material comprises an aluminosilicate composition, a borosilicate composition, a boroaluminosilicate composition, or a silicate glass composition.

6. The glass article of claim 1 , wherein the cover glass layer comprises a compressive stress at at least one of: a top surface of the cover glass layer or a bottom surface of the cover glass layer, and wherein the compressive stress region comprises a plurality of ion-exchangeable metal ions and a plurality of ion-exchanged metal ions, the ion-exchanged metal ions having an atomic radius larger than the atomic radius of the ion-exchangeable metal ions.

7. The glass article of claim 1 , wherein the cover glass layer is characterized by: an absence of failure when the cover glass layer is held at a bend radius from 3 millimeters to 10 millimeters for at least 60 minutes at 25° C. and 50% relative humidity.

8. The glass article of claim 1 , wherein the cover glass layer is characterized by: an absence of failure when the cover glass layer is held at a bend radius from 1 millimeter to 5 millimeters for at least 60 minutes at 25° C. and 50% relative humidity.

9. The glass article of claim 1 , wherein the cover glass layer is characterized by: a puncture resistance of greater than 1.5 kgf when a top, user-facing surface of the cover glass layer is loaded with a tungsten carbide ball having a diameter of 1.5 millimeters.

10. The glass article of claim 1 , wherein the cover glass layer comprises a pencil hardness of greater than or equal to 8H.

11. The glass article of claim 1 , wherein the cover glass layer comprises a maximum flaw size of 5 microns or less at at least one of: a top, user-facing surface of the cover glass layer or a bottom surface of the cover glass layer opposite the top, user facing surface.

12. The glass article of claim 1 , wherein the cover glass layer comprises a maximum flaw size of 5 microns or less at a top, user-facing surface of the cover glass layer and a bottom surface of the cover glass layer opposite the top, user facing surface.

13. The glass article of claim 1 , comprising a polymeric coating disposed on a top, user facing surface of the cover glass layer.

Assignees

• Corning Inc

Inventors

• Chang Theresa
• Chu Polly Wanda
• Cimo Patrick Joseph
• Ellison Adam James
• Gross Timothy Michael
• Hu Guangli
• Smith Nicholas James
• Vaddi Butchi Reddy
• Venkataraman Natesan

Classifications

• H05K3/46

  Manufacturing multilayer circuits · CPC title

• B32B2457/20

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

• B32B2457/00

  Electrical equipment · CPC title

• B32B2367/00

  Polyesters, e.g. PET, i.e. polyethylene terephthalate · CPC title

• B32B2315/08

  Glass · CPC title