Optical film, optical construction, and display system

Patent metadata

Field	Value
Publication number	US-12535630-B2
Application number	US-202118038292-A
Country	US
Kind code	B2
Filing date	Nov 2, 2021
Priority date	Dec 7, 2020
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

An optical construction includes a reflective polarizer and an optical film. The optical film includes a matrix and a plurality of first particles dispersed in the matrix. Each of the matrix and the plurality of first particles includes a silicone polyoxamide and an acrylate polymer. For substantially normally incident light and for at least a first wavelength in a first wavelength range, the reflective polarizer reflects about 60% for a first polarization state and transmits about 40% for an orthogonal second polarization state. For at least a second wavelength in a second wavelength range, each of the reflective polarizer and the optical film transmits about 60% of an incident light for each of the first and second polarization states. For at least the first wavelength, optical film has an optical haze and a depolarization ratio. A ratio of the depolarization ratio to the optical haze is less than 0.1.

First claim

The invention claimed is:

1 . An optical construction comprising:
a reflective polarizer comprising a first major surface and a second major surface opposite to the first major surface; and an optical film disposed on the first major surface of the reflective polarizer, the optical film comprising a matrix and a plurality of first particles dispersed in the matrix, each of the matrix and the plurality of first particles comprising a silicone polyoxamide and an acrylate polymer, such that:
for substantially normally incident light and for at least a first wavelength in a first wavelength range from about 400 nm to about 700 nm, the reflective polarizer reflects at least about 60% of the normally incident light for a first polarization state and transmits at least about 40% of the normally incident light for an orthogonal second polarization state;
for at least a second wavelength in a second wavelength range from about 800 nm to about 1500 nm, each of the reflective polarizer and the optical film transmits at least about 60% of an incident light for each of the first polarization state and the second polarization state; and
for at least the first wavelength, the optical film has an optical haze and a depolarization ratio, wherein a ratio of the depolarization ratio to the optical haze is less than about 0.1.

2 . The optical construction of claim 1 , wherein, for at least the second wavelength, the optical film has a scattering ratio of less than about 30%.

3 . The optical construction of claim 1 , wherein, for an obliquely incident light having an incident angle of at least about 45 degrees and for at least the first wavelength, the reflective polarizer reflects at least about 60% of the obliquely incident light for each of the first polarization state and the second polarization state.

4 . An optical construction comprising:
a reflective polarizer comprising a first major surface and a second major surface opposite to the first major surface; and an optical film disposed on the first major surface of the reflective polarizer, the optical film comprising a matrix and a plurality of first particles dispersed in the matrix, each of the matrix and the plurality of first particles comprising a silicone polyoxamide and an acrylate polymer, such that:
for substantially normally incident light and for a first wavelength range from about 400 nm to about 700 nm, the reflective polarizer has an average optical reflectance of at least about 60% for a first polarization state and an average optical transmittance of at least about 40% for an orthogonal second polarization state;
for a second wavelength range from about 800 nm to about 1500 nm, the reflective polarizer and the optical film, in combination, have an average optical transmittance of at least about 60% for each of the first polarization state and the second polarization state; and
for the first wavelength range, the optical film has an average optical haze and an average depolarization ratio, wherein a ratio of the average depolarization ratio to the average optical haze is less than about 0.1.

5 . The optical construction of claim 4 , wherein, for each of at least a majority of the first particles, a maximum dimension D 1 of the first particle is along a first direction and a maximum dimension of the first particle along an orthogonal second direction is D 2 , D 1 is greater than D 2 by at least 10%.

6 . An optical film comprising a matrix and a plurality of first particles dispersed in the matrix, each of the matrix and the plurality of first particles comprising a silicone polyoxamide and an acrylate polymer, wherein the first particles comprise more silicon than the matrix, and the matrix comprises more carbon than the first particles, wherein in a cross-section of the optical film, the first particles have a maximum first dimension X 1 along a first direction and a maximum second dimension X 2 along an orthogonal second direction, and wherein X 1 is greater than X 2 by at least 10%.

7 . The optical film of claim 6 , further comprising a plurality of second particles different from the first particles, at least some of the second particles partially protruding from at least one major surface of the optical film.

Assignees

• 3M Innovative Properties Company

Inventors

• Acharya Bharat R
• Sitter Brett J
• Taylor Robert D
• Tian Zhicheng
• Dizio James P
• Sanford Quinn D
• Hackbarth Kent C
• Sousa Matthew E

Classifications

• G06V40/13

  Sensors therefor · CPC title

• G02B5/26 Primary

  Reflecting filters (G02B5/28 takes precedence) · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• G02B5/305 Primary

  including organic materials, e.g. polymeric layers · CPC title

• G06F21/32

  using biometric data, e.g. fingerprints, iris scans or voiceprints · CPC title