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AssigneeThomson Licensing
InventorsDonald Walter Bartch, James Francis Edwards
Estimating the term…
The invention is a cathode-ray tube (CRT) and method of manufacturing the CRT having a contrast enhancing coating on the exterior surface of the viewing faceplate. The contrast enhancing coating reduces the transmission of faceplate of the CRT by about 50%. The coating also yields gloss values in the range of 70 to 90. The manufacture comprises the steps of preparing an intermediate formulation containing a hydrolyzed organic silicate, diluting the intermediate formulation with an organic solvent and adding a contrast enhancing material to provide a final formulation, spraying the final formulation onto the faceplate to form the coating, heating the faceplate to cure the coating, and rinsing the coating, thereby forming a stable contrast enhancing coating on the faceplate.
A CRT comprising a funnel having a neck attached to the narrow end of said funnel, an electron gun mounted in said neck, a viewing faceplate attached to a wide end of said funnel and having a luminescent screen on an interior surface of said faceplate, and a contrast enhancing coating on an exterior side of said viewing faceplate, wherein said contrast enhancing coating comprises a silicate binder and at least one contrast enhancing material, said contrast enhancing coating having both transmission reduction of visible light by about 50% and having a 60° gloss value of at least 70 to 90.
Dependencies are inferred from the claim text.