Polymeric films and display devices containing such films

Patent metadata

Field	Value
Publication number	US-11472909-B2
Application number	US-202017022271-A
Country	US
Kind code	B2
Filing date	Sep 16, 2020
Priority date	May 5, 2017
Publication date	Oct 18, 2022
Grant date	Oct 18, 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 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 polymeric matrix having a refractive index n 1 ; and
particles having a refractive index n 2 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 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 normalized micro-haze non-uniformity of not more than 12% across the polymeric film.

2. The polymeric film of claim 1 further comprising a second polymeric layer disposed on one major surface of the first polymeric 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; and wherein at least one of the first polymeric matrix and the second polymeric matrix is an adhesive matrix.

3. The polymeric film of claim 2 wherein the first polymeric matrix and the second polymeric matrix each comprises an adhesive matrix.

4. The polymeric film of claim 2 wherein n 1 is within 0.2 unit of n 3 .

5. The polymeric film of claim 2 wherein the second polymeric layer has a thickness of at least 25 microns.

6. The polymeric film of claim 2 wherein the first polymeric matrix and/or the second polymeric matrix comprise a multiphase morphology.

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 7 microns and up to 100 microns.

10. 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.

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

12. The polymeric film of claim 1 wherein the first polymeric matrix comprises an acrylate, a polyurethane, a polyolefin, a silicone, or a combination thereof.

13. The polymeric film of claim 12 wherein the first polymeric matrix comprises a polyolefin.

14. The polymeric film of claim 13 wherein the first polymeric matrix comprises polyisobutylene.

15. The polymeric film of claim 1 wherein the polymeric film has a bulk haze of 15% to 96%.

16. The polymeric film of claim 15 wherein the polymeric film has a bulk haze of 15% to 91%.

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.

18. The display device of claim 17 having an off-axis color shift (0-45°) that is at least 5% better than an off-axis color shift compared to a display device that includes a non-diffusive optically clear adhesive in place of the polymeric film.

19. The device of claim 18 having an off-axis color shift (0-60°) that is at least 5% better than an off-axis color shift compared to a display device that includes a non-diffusive optically clear adhesive in place of the polymeric film.

20. The device of claim 17 which is flexible or rigid.

Assignees

• 3M Innovative Properties Co

Inventors

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

Classifications

• C09J2301/312

  parameters being the characterizing feature · CPC title

• C09J2483/00

  Presence of polysiloxane · CPC title

• C08L2205/22

  Mixtures comprising a continuous polymer matrix in which are dispersed crosslinked particles of another polymer · CPC title

• C09J2475/00

  Presence of polyurethane · CPC title

• C08G18/73

  acyclic · CPC title