Georg Friedrich Gaertner

Accelerated life tests of CRT oxide cathodes

Sufficient oxide cathode life of several years in a cathode ray tube (CRT) environment at increased load is one of the key parameters in advanced CRT development. When changes are introduced, accelerated life tests are needed in order to quantify their impact. Hence the investigation of oxide cathode life limiting effects is the basis of accelerated life predictions. Especially, three basic effects are discussed and quantified: accelerated life by increased operating temperature, accelerated life by increased continuous load, and finally life acceleration by intermittent or continuos poisoning. These mechanisms can also suitably be combined.

Recent developments in oxide cathode research for CRT applications

Abstract Most of the improvement trends of cathode ray tubes (CRTs), which are still unsurpassed in cost efficiency and in front of screen performance, also require improved cathodes. In this paper, some of the recent work published by CRT companies is reviewed and details of more recent studies undertaken within LG–Philips Displays are given, which are aimed at improving the performance of the oxide cathode. In particular, the focus is directed on two main areas, namely the interface between cap and spray layer, and the composition and modification of the spray layer itself.