A triode of FED with low driving voltage

To make the driving electronic circuit of a field emission display device simple and cheap, the driving voltage of the FED has to be small. In this paper, a triode structure of carbon nanotube array with the insulator tunnels was analysed. In a normal triode structure, the electrons are accelerated when they pass through the aperture of the gate electrode. Therefore, driving voltage applied on the gate electrode is a little high. To decrease the driving voltage, the use of secondary electrons was attempted. Because the energy of the secondary electron is much smaller than that of the primary electrons, only a weak electric field is needed to control the movement of the secondary electrons. Consequently, the driving voltage of this triode can be smaller than that of the normal triode. In this structure, an insulator cone was used to separate the cathode and the gate. The secondary electrons are generated on the insulator wall. The structure was further modified to prevent some primary electrons from passing through the gate aperture. The driving voltage decreased further.