Min-Cheol Bae

42.1: A New Electron Gun for a 32″ Super Wide Deflection Angle (120°) CRT

A new electron gun for a super wide deflection angle (SWDA) cathode ray tube (CRT) has been developed. For a SWDA the dynamic focus voltage is usually very high, lowering the dynamic focus voltage is one of the key factors to realize wide angle CRTs. We designed a new quadrupole lens for the electron gun. As a result, we were able to achieve a reasonable focus quality with low dynamic voltage that is comparable to the conventional CRTs. The new electron gun enabled SWDA CRTs possible.

MF (Multi‐function) cathode for high current density CRT

Abstract A limitation of oxide cathode is the high current density, caused by low electrical conductivity of an emitter layer. This limitation can be overcome by increasing the conductivity, and uniform dispersion of Ni powder and pore agent could be achieved by using the screen‐printing method. This new cathode has shown not only high current density reliability but also improved performance characteristics and as such given the name “Multi‐Function cathode”. It is expected to be a good replacement of the impregnated cathode.