Polymeric films and display devices containing such films

Patent metadata

Field	Value
Publication number	US-11522025-B2
Application number	US-201816610710-A
Country	US
Kind code	B2
Filing date	May 3, 2018
Priority date	May 5, 2017
Publication date	Dec 6, 2022
Grant date	Dec 6, 2022

Abstract

Polymeric films, which may be adhesive films, and display devices including such polymeric films, wherein a polymeric film includes: a first polymeric layer having two major surfaces, wherein the first polymeric layer includes a first polymeric matrix and particles. The first polymeric layer includes: a first a polyolefin-based low WVTR adhesive polymeric matrix having a refractive index n1; and particles having a refractive index n2 uniformly dispersed within the first polymeric matrix; wherein the particles are present in an amount of less than 30 vol-%, based on the volume of the first polymeric layer, and have a particle size range of 400 nanometers (nm) to 3000 nm; and wherein n1 is different than n2.

First claim

What is claimed is:

1. A polymeric film comprising:
a first polymeric layer having two major surfaces, wherein the first polymeric layer comprises:
a first polyolefin-based low WVTR adhesive polymeric matrix having a refractive index n 1 ; and
particles having a refractive index n2 uniformly dispersed within the first polymeric matrix; and

a second polymeric layer disposed directly on one major surface of the first polymeric layer with no intervening layer; wherein the second polymeric layer comprises a second polymeric matrix having a refractive index n 3 ; wherein the first polymeric matrix and the second polymeric matrix are the same or different
wherein the particles are present in an amount of less than 30 vol-%, based on the volume of the first polymeric layer, and have a particle size range of 400 nm to 3000 nm; and
wherein n 1 is different than n 2 ;

wherein the polymeric film has:
a clarity of at least 80%;
a visible light transmission of at least 85%; and
a bulk haze of 15% to 80%.

2. The polymeric film of claim 1 wherein the second polymeric matrix comprises an adhesive matrix.

3. The polymeric film of claim 2 wherein the first adhesive matrix is different than the second adhesive matrix.

4. The polymeric film of claim 3 wherein n 1 is within 0.2 unit of n 3 .

5. The polymeric film of claim 1 wherein the second polymeric layer has a thickness of at least 25 microns.

6. The polymeric film of claim 1 wherein at least one adhesive matrix comprises an optically clear adhesive.

7. The polymeric film of claim 1 wherein the particles have a particle size range of 700 nm to 2.0 microns.

8. The polymeric film of claim 1 wherein the particles are present in the first polymeric matrix in an amount of at least 0.5 vol-%, and up to 25 vol-%, based on the total volume of the first polymeric layer.

9. The polymeric film of claim 1 wherein the first polymeric layer has a thickness of at least 10 microns and up to 100 microns.

10. The polymeric film of claim 1 wherein the polymeric film has a thickness of at least 10 microns and up to 130 microns.

11. The polymeric film of claim 1 wherein the particles comprise an organic polymeric material selected from a polydimethylsiloxane (PDMS), a polyurethane, a polymethyl methacrylate (PMMA), a polystyrene, or a combination thereof.

12. The polymeric film of claim 1 wherein n 1 is 0.01 to 0.5 unit different than n 2 .

13. The polymeric film of claim 1 wherein the polyolefin-based polymer matrix comprises a tackified polyolefin elastomer, an olefin block copolymer, or an alpha-olefin copolymer.

14. The polymeric film of claim 1 wherein the first polymeric matrix comprises polyisobutylene.

15. A display device comprising:
an organic light emitting diode panel having a multi-layer construction comprising one or more adhesive films; and
a polymeric film of claim 1 incorporated within the multi-layer construction of the organic light emitting diode panel;
wherein the polymeric film comprises at least one adhesive matrix; and wherein the display device has an off-axis color shift (0-45°) that is at least 5% better than an off-axis color shift compared to a like display device that includes a non-diffusive optically clear adhesive in place of the polymeric film.

16. The device of claim 15 which is flexible or rigid.

17. A display device comprising:
an organic light emitting diode panel having a multi-layer construction comprising one or more adhesive films; and
a polymeric film of claim 1 incorporated within the multi-layer construction of the organic light emitting diode panel;
wherein the polymeric film comprises at least one adhesive matrix; and wherein the display device has an off-axis color shift (0-60°) that is at least 5% better than an off-axis color shift compared to a like display device that includes a non-diffusive optically clear adhesive in place of the polymeric film.

Assignees

• 3M Innovative Properties Company

Inventors

• Hao Encai
• Yang Zhaohui
• Everaerts Albert I
• Lu Yongshang
• Kolb William Blake
• Bruesewitz Keith R

Classifications

• C09J2301/208

  the adhesive layer being constituted by at least two or more adjacent or superposed adhesive layers, e.g. multilayer adhesive · CPC title

• C09J2301/302

  the adhesive being pressure-sensitive, i.e. tacky at temperatures inferior to 30°C · CPC title

• C09J11/00

  Features of adhesives not provided for in group C09J9/00, e.g. additives · CPC title

• C09J183/04

  Polysiloxanes · CPC title

• C09J2203/326

  for bonding electronic components such as wafers, chips or semiconductors · CPC title