Broadband visible reflector
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.
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 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 R hemi (λ) over the visible spectrum, determined using the CIE 1931 photopic response function.