Multilayer antistatic/antireflective coating for display device

Details Multilayer antistatic/antireflective coating for display device Multilayer antistatic/antireflective coating for display device

1995-11-08

1997-07-29

Bell, Janyce

Electric lamp and discharge devices

Cathode ray tube

Envelope

313635, 427 64, 427 68, 427105, 427106, 427108, 4271262, 4271263, 427162, 427165, 427240, 4274193, H01J 3100, B05D 506

Patent

active

056524773

ABSTRACT:
For use on the outer surface of a faceplate of a display device such as of the cathode ray tube (CRT) type, a first inner antistatic layer of Sb--SnO.sub.2 (particle size between 5-20 nm) is applied to a thickness in the range of 200-600 nm. The Sb--SnO.sub.2 layer has a high light refractive index (n.sub.1 =1.8) and also provides an antireflection function. After pre-heating the faceplate to a temperature in the range of 35.degree.-50.degree. C., a second intermediate antireflection layer of colloidal TiO.sub.2 (light refractive index n.sub.2 =2.0 and particle size between 5-50 nm) is applied over the first inner layer to a thickness of 100-200 nm. A third outer antireflection layer is then applied over the intermediate layer in the form of a silica gel coating at a temperature in the range of 35.degree.-45.degree. C. with a thickness in the range of 100-200 nm and a light refractive index n.sub.3. The second and third antireflective layers follow the 1/4 wavelength rule, where n.sub.3 .perspectiveto..sqroot.n.sub.2 . The multilayer antireflective coating may also be employed in a five layer coating, where the TiO.sub.2 and silica gel layers are repeated in proceeding outward from the glass substrate to provide a wideband antireflection capability.

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