Low reflectance display device
AssigneeU.S. Philips Corporation
InventorsJohannes C. N. Rijpers, Henricus M. De Vrieze
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Abstract
An anti-reflection coating which comprises at least a three layer interference filter is evaporated on the external surface of a faceplate panel. The manufacture of the coating can be speeded-up substantially by selecting high and low refractive index materials which can be evaporated at ambient temperatures and subsequently hardened by high temperature annealing outside the evaporation apparatus. The annealing is carried out most conveniently during the standard processing of a cathode ray tube.
Claims6
A display device having an optically transparent faceplate, an anti-reflection coating on an external surface of the faceplate, the anti-reflection coating comprising at least three layers of materials which are depositable at ambient temperature by evaporation and hardenable by subsequent annealing, said layers having been hardened by annealing, the material of one of said layers having a high refractive index with respect to that of the material of the faceplate and another one of said layers having a low refractive index with respect to that of the material of the faceplate.
Dependencies are inferred from the claim text.