Spherical phosphors for projection CRTs

摘要

We have developed spherical phosphors and used them in projection cathode ray tubes (CRTs) for the first time in the world. Decomposition of the phosphor materials has been minimized by optimizing both the plasma treatment and annealing conditions. Phosphor layers made of spherical phosphors are found to be dense and thin. Thus, by optimizing the phosphor particle size with the aid of simulation calculations and using a newly developed electron gun, the resolution of the projection CRT has been increased by up to 40%.