Chunghwa Picture Tubes, Ltd.

Chung-Min Hu

Hua-Sou Tong

Yu-Chung Yu

Mi-Yui Hsu

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.

Multilayer antistatic/antireflective coating for display device

An antistatic coating for the outer surface of a video display panel such as of a cathode ray tube (CRT), and a method of applying this type of surface coating, employs a conventional antistatic material such as antimony doped tin oxide to which is added a solvent which is (1) soluble in water and alcohol, (2) has an evaporation point higher than that of water, and (3) has greater solubility for oil-based contaminants than for water. Solvents having these characteristics and which are adapted for use in the antistatic coating include ethylene glycol and dimethyl-based solvents, and their derivatives. The antistatic coating has reduced susceptibility to picking up surface contaminants such as dust and wiping residues such as applied in cleaning the display panel, particularly during manufacture, while affording a high degree of static charge dissipation.

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Taiwan, China

Chung-Min Hu