What Does Vacuum Fluorescent Display (VFD) Mean?
Vacuum fluorescent displays (VFDs) are high-contrast displays mostly used in consumer electronic devices, such as audio/video equipment for the home or vehicles. The displays are typically colored green and can display numerals, dot matrix patterns or alphanumeric characters. They are bright and perform well in all light conditions including full sunlight. Vacuum fluorescent displays have various advantages such as liquid crystal display (LCD) compatibility and can be considered as suitable replacements for organic light emitting diode (OLED) and liquid crystal display modules.
Techopedia Explains Vacuum Fluorescent Display (VFD)
A vacuum fluorescent display is comprised of a filament, insulation layer, anode electrode, wiring pattern and grid. Filament is the cathode for the vacuum fluorescent display and usually is made of alkaline-coated tungsten wires, which help in emitting light. The cathode is heated by an external source to emit the free thermal electrons and the grid controls the electrons. In order to achieve non-light emission, the electrons from the filament are either blocked by the grid or by the negative potential anode. Similarly, for light emission, the electrons from the filament accelerate to the positively charged anode and the phosphor on the anode emits luminous radiation due to the excitation of the electrons.
