Textured region to reduce specular reflectance including a low refractive index substrate with higher elevated surfaces and lower elevated surfaces and a high refractive index material disposed on the lower elevated surfaces

A substrate for a display article, the substrate comprising:

• a primary surface;
• and
• a textured region on at least a portion of the primary surface, the texture region comprising:
• one or more higher surfaces residing at a higher mean elevation parallel to a base-plane disposed below the textured region and extending through the substrate;
• one or more lower surfaces residing at a lower mean elevation parallel to the base-plane that is less than the higher mean elevation;
• surface features projecting from or disposed within a surrounding portion at the primary surface, wherein (i) the surface features provide either the one or more higher surfaces or the one or more lower surfaces, (ii) the surrounding portion provides the other of the one or more higher surfaces or the one or more lower surfaces, whichever the surface features are not providing;
• and
• a high-index material disposed on the one or more lower surfaces residing at the lower mean elevation, the high-index material comprising (i) an index of refraction that is greater than the index of refraction of the substrate or a low-index material providing the one or more higher surfaces and (ii) one or more intermediate surfaces residing at an intermediate mean elevation parallel to the base-plane that is between the higher mean elevation and the lower mean elevation.

A method of forming a textured region of a substrate for a display article, the method comprising:

• forming surface features projecting from or disposed within a surrounding portion at a primary surface of a substrate according to a predetermined positioning of each surface feature, thus forming a textured region, wherein (i) one or more higher surfaces of the textured region residing at a higher mean elevation parallel to a base-plane disposed below the textured region and extending through the substrate, (ii) one or more lower surfaces of the textured region reside at a lower mean elevation parallel to the base-plane that is less than the higher mean elevation, (iii) the surface features provide either the one or more higher surfaces or the one or more lower surfaces, and (iv) the surrounding portion provides the other of the one or more higher surfaces or the one or more lower surfaces, whichever the surface features do not provide;
• and
• depositing a high-index material on whichever of the surface features or the surrounding portion providing the one or more lower surfaces residing at the lower mean elevation, the high-index material comprising (i) an index of refraction that is greater than the index of refraction of the substrate and (ii) one or more intermediate surfaces residing at an intermediate mean elevation parallel to the base-plane that is between the higher mean elevation and the lower mean elevation.