Rheology and Firing Properties of Phosphor Pastes for CRT Displays

Abstract

A new method of manufacturing phosphor screens for flat CRT displays is developed by a combination of screen printing and thermal transfer processes. The main issues for high resolution displays are the printability and firing properties of phosphor pastes, and packing density of particles deposited on panels. The most important components which are closely connected with these requirements are the polymeric binders. The polymeric binders which lead to weak flocculation of phosphor particles provide the good rheological properties for reproduction of precise micropatterns. Because of weak adsorption affinity for the particle surfaces, the pastes prepared with such binders are thoroughly fired without ashes on heating at the temperature where the complete decomposition of binder polymers takes place. The glass panels are incorporated with electron gun and the CRT panels are built as model displays. The brightness of newly developed displays will be acceptable for practice applications.