VFD is composed of the following structure: based on the Face Glass and Side Glass forming a vacuum container, with the basic electrodes of Filament (Cathode: releasing electrons) and Grid and Anode (accelerating and controlling the released thermal electrons) in the vacuum space; and various metal parts (Support, Mount, Lead) accompanied to those parts above.

- Functions by Each Part

¤ýFace Glass : protects illumination caused by external electric field and static electricity through the
¤ýapplication of the transparent conductive layer inside
¤ýFilament : emits thermal electrons. Tungsten wires coated with Carbonate
¤ýExhaust Pipe : air pipe to create a vacuum state by exhausting the tube
¤ýSide Glass : secures space inside the product and boundary forming vacuum
¤ýContactor : eliminates static electricity by applying current to the transparent conductive film of
¤ýthe Mount Assembly and Face Glass
¤ýLead Pin : supplies powers from the outside to the Filament and wiring layers
¤ýSubstrate Glass : a substrate with wiring and phosphors to providing powers to the phosphors being
¤ýpressed on
¤ýGrid : Metal network(mesh) controlling and accelerating electrons released from the Filament
¤ýInsulation Layer: shields the current from transferring between wiring layers and conductive layers
¤ýAnode : When +supplied: attracts electrons to illuminate phosphors When -supplied: rebounds
¤ýelectrons and not illuminates
¤ýGetter : absorbs gas or impurities released from each part to increase vacuum
¤ýIC : Packed Driver(for driving VFD) as a Bare Chip condition (¡æ CIG VFD)
¤ýSupport : fixed at the frames, it decides the structure of the Filament (Pitch, height)

¨ç To supply voltage to the Filament, thermo-electrons emitted.
¨è Electrons heading to the Anode are accelerated at the Grid.
¨é Emitted electrons are attracted to phosphors of the Anode of the lower substrate supplied with (+)
¨é voltage
¨ê Accelerated electrons collide onto the phosphor layer and illuminate
¡Ø When (-) is supplied to the Anode and Grid, electrons bound back.

- VFD has a triode structure. The Cathode (Filament) releases electrons, and the electrons are
- accelerated by the Grid;
- Advantages of VFD
  ¨ç High luminance with top level visibility
  ¨è Good appearance with the colors with high purity
  ¨é High reliability and long life span
  ¨ê Relatively low voltage (12~70V) driving possible
  ¨ë Wide viewing angle / quick response speed