Inexpensive Method for the Application of High Secondary Emission Protective Coatings Onto Plasma Display Panels
Original Publication Date: 1984-Dec-01
Included in the Prior Art Database: 2005-Feb-06
A method to provide a refractory coating of a high secondary emission characteristic to glass substrates used in gas discharge display panels has been developed. Present methods using high vacuum evaporation techniques to apply magnesium oxide (MgO) to glass substrates are relatively expensive and time consuming, and are further limited by the evaporator size and its inherent batch-type operation. The use of a solution-derived coating to uniformly deposit films by dip coating can be extended to the glass plates of gas display panels. An alcoholate solution including magnesium oxide and aluminum oxide has been found to produce acceptable secondary emission coatings on glass substrates. The process involves the immersion and slow, constant withdrawal of a masked glass substrate from the alcoholate solution into clean room air.