Printing of Three Color Phosphor Patterns on Flat Glass by Offset Letterpress.

A research program was inaugurated at Lehigh University, under the sponsorship of the Radio Corporation of America, to study and develop the application of mechanical printing methods to the production of high quality three color television screens. The specific problem was to print three individual phosphor patterns, representing the green, blue and red screen components, on a flat glass in conformity with severe registration, light efficiency and uniformity requirements. An offset letterpress process was selected since the three patterns could be placed successively on the offset blanket with the least likelihood of contamination between the three phosphor inks. A modified single color Vandercook 22-34 Offset proof press was used for the development program.