Influence of the dielectric layer on the performance of FED

In a field emission display device, the triode structure influences the emission characteristic of the field emitters seriously. And the focusing of the electron beam is hard to achieve. Apart from this, the permittivity of the dielectric layer (ε_d) in the triode determines the capacitance between the cathode and gate electrodes. This capacitance influences the charging time of the cathode pulse and the gray scale of the video image. This paper studies a triode structure to find how ε_d affects the performance, and how to achieve electron beam focusing.