Flexible conductive display film

{
  "publication_number": "US2020150789A1",
  "country": "US",
  "kind": "A1",
  "title": "Flexible conductive display film",
  "abstract": "A display film includes a transparent energy dissipation layer having a glass transition temperature of 27 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater, and a transparent conductor layer disposed on the transparent energy dissipation layer. The conductive display films including transparent conductors and a flexible substrate that can protect a display window and survive folding tests intact while maintaining the desired electric conductive properties.",
  "claims": [
    "1. A display film comprising: a transparent energy dissipation layer having a glass transition temperature of 27 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater; and a transparent conductor layer disposed on the transparent energy dissipation layer. 2. The display film according to claim 1, wherein the transparent conductor layer comprises a plurality of nanowires. 3. The display film according to claim 1, wherein the transparent conductor layer comprises a pattern of nanowires. 4. The display film according to claim 1, wherein the transparent conductor layer comprises silver nanowires having a diameter of 100 nanometers or less. 5. The display film according to claim 1, further comprising a second transparent conductor layer disposed on the transparent energy dissipation layer, wherein the transparent energy dissipation layer separates the transparent conductor layers. 6. The display film according to claim 5, wherein the second transparent conductor layer comprises a plurality of nanowires forming a pattern. 7. The display film according to claim 5, wherein the second transparent conductor layer comprises silver nanowires having a diameter or lateral distance of 100 nanometers or less. 8. The display film according to claim 6, wherein the second transparent conductor layer pattern comprises linear extending traces that are orthogonal to the transparent conductor layer plurality of nanowires comprising linear extending traces. 9. The display film according to claim 1, wherein the transparent conductor layer is embedded within the transparent energy dissipation layer. 10. The display film according to claim 6, wherein the transparent conductor layer comprises a plurality of nanowires embedded within the transparent energy dissipation layer and the second transparent conductor layer comprises a plurality of nanowires embedded within the transparent energy dissipation layer. 11. The display film according to claim 1, wherein the transparent energy dissipation layer comprises cross-linked polyurethane or cross-linked polyurethane acrylate or cross-linked polyurethane and polyacrylate. 12. The display film according to claim 1, wherein the display film has a haze value of less than 5%, or less than 3%, or less than 2%, or less than 1%, and the display film has a visible light transmission value greater than 85%, or greater than 90%, and the display film has a clarity value greater than 90%, or greater than 95% or greater than 98%. 13. The display film according to claim 1, wherein the transparent energy dissipation layer has a glass transition temperature of 25 degrees Celsius or less, or 20 degrees Celsius or less, or 15 degrees Celsius or less, 10 degrees Celsius or less, 5 degrees Celsius or less, or 0 degrees Celsius or less, or −5 degrees Celsius or less, or in a range from −40 to 15 degrees Celsius, or in a range from −30 to 15 degrees Celsius, or in a range from −30 to 10 degrees Celsius, or in a range from −30 to 5 degrees Celsius, or in a range from −30 to 0 degrees Celsius, or in a range from −20 to 0 degrees Celsius. 14. The display film according to claim 1, wherein the transparent energy dissipation layer has a Tan Delta peak value of 0.8 or greater, or 1.0 or greater, or 1.2 or greater, or in a range from 0.5 to 2.5, or in a range from 1 to 2.5. 15. A display film comprising: a transparent energy dissipation layer having a glass transition temperature of 27 degrees Celsius or less and a Tan Delta peak value of 0.5 or greater, and defining a first major surface and an opposing second major surface; a transparent conductor layer disposed on the first major surface of the transparent energy dissipation layer; a protective layer disposed on the second major surface. 16. The display film according to claim 15, wherein the transparent conductor layer comprises a plurality of nanowires. 17. The display film according to claim 15, wherein the transparent conductor layer comprises a pattern of conductive regions. 18. The display film according to claim 15, wherein the transparent conductor layer comprises silver nanowires having a diameter of 100 nanometers or less. 19. The display film according to claim 15, wherein the transparent conductor layer comprises a plurality of nanowires embedded within the transparent energy dissipation layer. 20. The display film according to claim 15, wherein the protective layer comprises nanoparticles and has a thickness in a range from 2 to 30 micrometers, or from 2 to 15 micrometers, or from 3 to 10 micrometers. 21. The display film according to claim 15, wherein the protective layer comprises a glass layer having a thickness in a range from 15 to 500 micrometers, or from 20 to 120 micrometers, or from 30 to 100 micrometers, or from 30 to 80 micrometers. 22. The display film according to claim 15, further comprising an adhesive layer disposed on the transparent conductor layer. 23. The display film according to claim 15, wherein the display film has a thickness of less than 500 micrometers, or less than 300 micrometers, or less than 200 micrometers, or in a range from 85 to 350 micrometers or from 100 to 250 micrometers or from 100 to 200 micrometers. 24. The display film according to claim 15, wherein the transparent energy dissipation layer comprises cross-linked polyurethane or cross-linked polyurethane acrylate or cross-linked polyurethane and polyacrylate. 25. The display film according to claim 15, wherein the display film has a haze value of less than 5%, or less than 3%, or less than 2%, or less than 1%, and the display film has a visible light transmission value greater than 85%, or greater than 90%, and the display film has a clarity value greater than 90%, or greater than 95% or greater than 98%. 26. The display film according to claim 15, wherein the transparent energy dissipation layer has a glass transition temperature of 25 degrees Celsius or less, or 20 degrees Celsius or less, or 10 degrees Celsius or less, or 5 degrees Celsius or less, or 0 degrees Celsius or less, or −5 degrees Celsius or less, or in a range from −40 to 15 degrees Celsius, or in a range from −30 to 15 degrees Celsius, or in a range from −30 to 10 degrees Celsius, or in a range from −30 to 5 degrees Celsius, or in a range from −30 to 0 degrees Celsius, or in a range from −20 to 0 degrees Celsius. 27. The display film according to claim 15, wherein the transparent energy dissipation layer has a Tan Delta peak value of 0.8 or greater, or 1.0 or greater, or 1.2 or greater, or in a range from 0.5 to 2.5, or in a range from 1 to 2.5. 28. An article, comprising: an optical display; a display film, according to claim 1, fixed to the optical display. 29. The article according to claim 28, wherein the optical display comprises organic light emitting diodes. 30. The article according to claim 28, wherein the optical display and display film is foldable so that the optical display faces itself and at least a portion of the display film overlaps with another portion of the display film. 31. The article according to claim 28, wherein the optical display is fixed to the display with an optical adhesive."
  ],
  "description_excerpt": "Displays and electronic devices have evolved to be curved, bent, or folded and provide new user experiences. These device architectures may include flexible organic light emitting diodes (OLEDs), plastic liquid crystal displays (LCDs) and the like, for example.\n\nIn order to realize flexible displays and protect elements in the displays, a flexible cover sheet or flexible window film replaces a conventional glass cover sheet. This flexible cover sheet has several design parameters such as; high visible light transmission, low haze, excellent scratch resistance and impact resistance, in order to protect the elements included in the display devices. In some cases, the flexible cover sheet may need to withstand thousands of folding events around a tight bend radius (about 5 mm or less) without damage. In other cases, the flexible cover sheet must be able to unfold without leaving a visible crease after being bent at elevated temperature and humidity.\n\nA variety of hard coated plastic substrates have been explored. More exotic materials like hard coated colorless transparent polyimide films have also been shown to have high hardness and good scratch resistance. However, many hard-coated films fail to withstand folding events around a tight bend radius without showing visible damage and fail to provide adequate impact resistance.\n\nDurable and flexible touch sensor constructions are also useful and typically include conductors on or in a polymer film. Typical commercial conductors are indium tin oxide (ITO) traces or metal mesh.",
  "cpc": [
    "H10K 59/8794",
    "B64F 1/222",
    "B64U 80/70",
    "B64U 80/86",
    "B65G 1/0435",
    "B65G 1/0485",
    "B66C 7/08",
    "G06F 2203/04102",
    "G06F 3/041",
    "H01L 27/32",
    "H10K 2102/311",
    "H10K 59/00",
    "Y02T 10/70"
  ],
  "ipc": [
    "G06F 3/041"
  ],
  "assignees": [
    "3M Innovative Properties Co"
  ],
  "inventors": [
    "V Joseph W. Woody",
    "David Scott Thompson",
    "Matthew S. Stay",
    "Michael A. Johnson",
    "Daniel J. Theis",
    "Ann Marie GILMAN",
    "Shawn C. Dodds"
  ],
  "filing_date": "2018-07-19",
  "publication_date": "2020-05-14",
  "priority_date": "2017-07-21",
  "application_number": "US-201816632788-A",
  "family_id": "65015395",
  "cited_by_count": 10
}