HIGH-VOLTAGE STABILITY COATINGS IN THE ZEUS PANEL

A high voltage is applied to the screen spacer of the Zeus panel to ob tain high brightness and long phosphor lifetime. To prevent held emiss ion due to high local field strength, the screen spacer is coated with a resistivity layer and a low secondary-electron-emission layer. Effi ciently operating panels have been made with sputtered substoichiometr ic and stoichiometric silicon nitride films, and with sprayed chromium oxide and silicon nitride particle layers. For the sputtered layers t he effect of stoichiometry, sheet resistance and layer thickness on th e panel performance is discussed. In the case of the sprayed layers th e effect of suspension quality, spray conditions, layer thickness and layer roughness is discussed.