VFD meaning in Electronics ?

Answer:

What is Vacuum Fluorescent Display mean?

A vacuum fluorescent display (VFD) is a display device once commonly used on consumer electronics equipment such as video cassette recorders, car radios, and microwave ovens. LCDs, OLED displays and LED segment displays have now largely replaced VFDs.

A VFD operates on the principle of cathodoluminescence, roughly similar to a cathode ray tube, but operating at much lower voltages. Each tube in a VFD has a phosphor-coated carbon anode that is bombarded by electrons emitted from the cathode filament. In fact, each tube in a VFD is a triode vacuum tube because it also has a mesh control grid.

Unlike liquid crystal displays, a VFD emits a very bright light with high contrast and can support display elements of various colors. Standard illumination figures for VFDs are around 640 cd/m2 with high-brightness VFDs operating at 4,000 cd/m2, and experimental units as high as 35,000 cd/m2 depending on the drive voltage and its timing. The choice of color (which determines the nature of the phosphor) and display brightness significantly affect the lifetime of the tubes, which can range from as low as 1,500 hours for a vivid red VFD to 30,000 hours for the more common green ones. Cadmium was commonly used in the phosphors of VFDs in the past, but the current RoHS-compliant VFDs have eliminated this metal from their construction, using instead phosphors consisting of a matrix of alkaline earth and very small amounts of group III metals, doped with very small amounts of rare earth metals.

VFDs can display seven-segment numerals, multi-segment alpha-numeric characters or can be made in a dot-matrix to display different alphanumeric characters and symbols. In practice, there is little limit to the shape of the image that can be displayed: it depends solely on the shape of phosphor on the anode(s).

The first VFD was the single indication DM160 by Philips in 1959. The first multi-segment VFD was a 1967 Japanese single-digit, seven-segment device. The displays became common on calculators and other consumer electronics devices. In the late 1980s hundreds of millions of units were made yearly.

reference

Full Form	Category
Vernacularly Fastened Door	Academic & Science
Very Frilly Doilie	Business
Vertical Flame Diversion	Business
Vixens Fixin Dinner	Community
Very Fun Day	Community
Visitable Fungal Ditches	Community
Violet's Fifteenth Date	Community
Very Fancy Doilies	Community
Variable Frequency Speed Drive	Computing
Voice Fax Data	Computing
Variable Frequency Drive	Electronics
Vacuum Fluorescent Display	Electronics
Virtual Field Device	Electronics
Veiled Facial Disguise	General
Very Fresh Dill (pickle)	General
Valuable Fast Dogs	General
Vinegar Flavored Doughnut	General
Very Fine Donut	General
Verdant Flammable Device	General
Village of Fowl Devotees	General
Variable Frequency Drives	General
Votes for Deletion	General
Virtual Floppy Drive	General
Visual Field Defect	General
Very Friendly Dinosaur	General
Virtual Fantasy Dungeon	General
Very Far Distance	General
Vehicle Finance Division	General
Very Fortunate Disaster	Governmental
Volunteer Fire Detective	Governmental
Various Finary Disguises	Governmental
Volunteer Feline Detective	Governmental
Verified Finder of Documents	Governmental
Volunteer Fire Department	Governmental
Veterinary Feed Directive	Governmental
Volonteer Fire Department	Governmental
Vote For Deletion	Internet
Volunteers Fighting Disease	Medical
Value for Duty	Military and Defence
Volunteer Factual Dispatch	Military and Defence
Vector Field Diffusion	Physics Related
Volleyball for Dummies	Sports