Anti-reflective coatings for CRTs by sol-gel process

Two types of anti-reflective coatings composed of nano-particles were devel oped for cathode ray tubes (CRTs). The anti-reflective and anti-static coat ing is composed of two layers. An outer SiO2 layer is formed over a porous inner layer composed of titanium oxynitride (TiOxNy), antimony-doped tin ox ide (ATO) and SiO2. To control the reflection of the film, a porous structu re is formed using a mixed sol composed of TiOxNy-ATO particles and hydroly zed-polymerized tetraethoxy-silane (TEOS). The resulting double layered coa ting is shown to consist in a nanocomposite pseudo three-layer structure. T he antireflective electromagnetic-wave-shielding coating is also composed o f two layers. An outer SiO2 layer is formed over an electric-conductive inn er layer composed of silver colloids, TiOxNy nano particles. Silver colloid s are used to obtain a film having low surface resistivity and TiOxNy nano- particles contained in the inner layer enhance the durability of the film. To reduce the plasma-resonance absorption caused by silver colloids, silver ions are added to the outer layer solution. The silver ions diffuse into t he inner layer from the outer layer when the film is cured, touch to the su rface of silver colloids, suppress the silver colloid growth and reduce the specific absorption of the film. These coatings are successfully applied t o the panel glass for CRTs on an industrial scale.