LOW-COLOR SCRATCH-RESISTANT ARTICLES WITH A MULTILAYER OPTICAL FILM

摘要

Embodiments of this disclosure pertain to articles that exhibit scratch-resistance and improved optical properties. In some examples, the article exhibits a color shift of about 2 or less, when viewed at an incident illumination angle in the range from about 0 degrees to about 60 degrees from normal under an illuminant. In one or more embodiments, the articles include a substrate, and an optical film disposed on the substrate. The optical film includes a scratch-resistant layer and an optical interference layer. The optical interference layer may include one or more sub-layers that exhibit different refractive indices. In one example, the optical interference layer includes a first low refractive index sub-layer and a second a second high refractive index sub-layer. In some instances, the optical interference layer may include a third sub-layer.

主权项

1. A device comprising:
a display comprising a user interface; and a cover article disposed over the display, the cover article comprising a substrate having a surface, and an optical film disposed on the substrate surface forming a coated surface, wherein the cover article comprises a maximum hardness of 12 GPa or greater, as measured by a Berkovich Indenter Hardness Test along indentation depths of about 100 nm or greater, an average transmittance of 85% or greater over a visible spectrum, and a color shift of 2 or less, when viewed at an incident illumination angle in the range from about 2 degrees to about 60 degrees from normal incidence under an illuminant comprising CIE A illuminants, CIE B illuminants CIE C illuminants, CIE D illuminants or CIE F illuminants, wherein color shift is determined by the equation √((a*2−a*1)2+(b*2−b*1)2), where a*1 and b*1 are coordinates of the article when viewed at normal incidence and a*2, and b*2 are coordinates of the article viewed at the incident illumination angle, and wherein the coordinates of the article when viewed at normal incidence and at the incident illumination angle are both in transmittance or reflectance.