9/24/2023 0 Comments 7 segment display font generator![]() ![]() 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. Standard illumination figures for VFDs are around 640 cd/m 2 with high-brightness VFDs operating at 4,000 cd/m 2, and experimental units as high as 35,000 cd/m 2 depending on the drive voltage and its timing. Unlike liquid crystal displays, a VFD emits very bright light with high contrast and can support display elements of various colors. In fact, each tube in a VFD is a triode vacuum tube because it also has a mesh control grid. Each tube in a VFD has a phosphor-coated carbon anode that is bombarded by electrons emitted from the cathode filament. Different VFD tubesĪ 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.Ī VFD operates on the principle of cathodoluminescence, roughly similar to a cathode ray tube, but operating at much lower voltages. ![]() All segments are visible due to external ultraviolet illumination. Vacuum fluorescent display from a CD and dual cassette Hi-Fi.
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