Fluorescent Display Tube And Fluorescent Display Device Having Touch Switch Portion

摘要

In a fluorescent display tube having an electrostatic capacitor type touch switch portion on a front plate, a shield electrode is provided between a filament cathode and the touch switch portion. Electrons emitted from the filament cathode are prevented from irradiating on the touch switch portion and the touch switch portion and a neighbor thereof are prevented from being charged up, thereby an operation of the electrostatic capacitor type touch switch becomes stable.