# US 2021/0239887 A1 · Broadband visible reflector

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- Number: US 2021/0239887 A1
- Document ID: US20210239887A1
- Status: Published application
- Kind: A1
- Application number: 17/301,946
- Filed: 2021-04-20
- Published: 2021-08-05
- Earliest claimed: 2015-12-18
- Assignees: 3M Innovative Properties Company
- Applicants: 3M Innovative Properties Company
- Inventors: Edward J. Kivel; Ryan T. Fabick; Timothy J. Nevitt
- Web page: https://patentgrep.com/patent/US20210239887A1

## CPC

- G02B 5/0841: {comprising organic materials, e.g. polymers}
- G02B 5/26: Reflecting filters (G02B5/28 takes precedence)
- G02B 5/287: {comprising at least one layer of organic material}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

Broadband visible reflectors are disclosed. In particular, broadband visible reflectors with reduced on-axis blue reflectivity are described. Broadband visible reflectors that appear yellow in reflection are described. Such broadband visible reflectors may be used in backlights and displays.

## Claims

### Claim 1

A broadband visible reflector, comprising:
a plurality of optical repeat units, each optical repeat unit including a first birefringent polymer layer and a second polymer layer;
wherein the broadband visible reflector transmits not less than 10% of unpolarized light at normal incidence between 380 nm and 430 nm; and
wherein the broadband visible reflector provides at least 95% photopically-weighted
average Rhemi(λ) over the visible spectrum, determined using the CIE 1931 photopic response function.

### Claim 2 (depends on 1)

The broadband visible reflector of claim 1, wherein the broadband visible reflector transmits not less than 20% of unpolarized light at normal incidence between 380 nm and 430 nm.

### Claim 3 (depends on 1)

The broadband visible reflector of claim 1, wherein the broadband visible reflector transmits not less than 30% of unpolarized light at normal incidence between 380 nm and 430 nm.

### Claim 4

A broadband visible reflector, comprising:
a plurality of optical repeat units, each optical repeat unit including a first birefringent polymer layer and a second polymer layer;
wherein the broadband visible reflector appears yellow in reflection; and
wherein the broadband visible reflector provides at least 95% photopically-weighted average Rhemi(λ) over the visible spectrum, determined using the CIE 1931 photopic response function.

### Claim 5 (depends on 4)

The broadband visible reflector of claim 4, wherein the broadband visible reflector appears blue in transmission.