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US 11,029,455 B2Granted
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.
Claims1
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 optical repeat units each have an optical thickness;
- wherein the optical thickness of any optical repeat unit in the broadband visible reflector is not less than 220 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
Dependencies are inferred from the claim text.