Patent ID: 7462397

Claim:
A coated article including a multi-layer coating supported by a glass substrate, the multi-layer coating comprising, from the glass substrate outwardly: a layer comprising silicon nitride located directly on and contacting the glass substrate; a layer comprising zinc oxide located directly on and contacting the layer comprising silicon nitride; a layer comprising silver located over and contacting the layer comprising zinc oxide; a dielectric layer comprising a metal oxide; another layer comprising silver; another dielectric layer; wherein the coated article is heat treated and has a ratio T vis /R s of at least 25 after heat treatment (where T vis is visible transmission (%) and R s is sheet resistance of the coating in units of ohms/square) and a ΔE* value (glass side reflective and/or transmissive) of less than or equal to about 8 due to the heat treatment; and wherein the layer comprising silicon nitride is Si-rich and has an index of refraction “n”of at least 2.10.