US 9,810,824 B2
Omnidirectional high chroma red structural colors
Debasish Banerjee, Ann Arbor, MI (US); and Li Qin Zhou, Ann Arbor, MI (US)
Assigned to Toyota Motor Engineering & Manufacturing North America, Inc., Erlanger, KY (US)
Filed by Toyota Motor Engineering & Manufacturing North America, Inc., Erlanger, KY (US)
Filed on May 2, 2016, as Appl. No. 15/144,283.
Application 15/144,283 is a continuation in part of application No. 14/793,117, filed on Jul. 7, 2015.
Application 14/793,117 is a continuation in part of application No. 14/607,933, filed on Jan. 28, 2015.
Application 14/793,117 is a continuation in part of application No. 15/144,283, filed on May 2, 2016.
Application 15/144,283 is a continuation in part of application No. 14/793,123, filed on Jul. 7, 2015, granted, now 9,664,832.
Application 14/793,123 is a continuation in part of application No. 14/607,933, filed on Jan. 28, 2015.
Application 14/793,123 is a continuation in part of application No. 15/144,283, filed on May 2, 2016.
Application 15/144,283 is a continuation in part of application No. 14/793,133, filed on Jul. 7, 2015, granted, now 9,658,375.
Application 14/793,133 is a continuation in part of application No. 14/607,933, filed on Jan. 28, 2015.
Prior Publication US 2016/0245969 A1, Aug. 25, 2016
Int. Cl. G02B 1/10 (2015.01); G02B 5/28 (2006.01); G02B 5/08 (2006.01); G02B 5/26 (2006.01)
CPC G02B 5/286 (2013.01) [G02B 5/0825 (2013.01); G02B 5/0858 (2013.01); G02B 5/26 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A multilayer interference thin film that reflects an omnidirectional high chroma red structural color comprising:
a multilayer thin film having a reflector layer, at least one absorber layer extending across the reflector layer; and an outer dielectric layer extending across the at least one absorber layer;
wherein the multilayer thin film reflects a single narrow band of visible light when exposed to white light and the outer dielectric layer has a thickness of less than or equal to 2.0 quarter wave (QW) of a center wavelength of the single narrow band of visible light, the single narrow band of visible light having:
a visible full width half maximum (FWHM) width of less than 200 nm;
a color between 0° and 30° on a Lab color space; and
a hue shift of less than 30° on the Lab color space when the multilayer thin film is viewed at angles between 0-45° relative to a direction normal to an outer surface of the outer dielectric layer.