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US 2021/0239887 A1Published application
Broadband visible reflector
Assignee3M Innovative Properties Company
InventorsEdward J. Kivel, Ryan T. Fabick, Timothy J. Nevitt
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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.
Claims5
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.
2 more elements
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.
1 more element
Dependencies are inferred from the claim text.