真空荧光显示器是一种和阴极射线管相似的显示设备，真空荧光管的主要器件是一个带有栅极的电子管，阴极射出的电子在栅极的吸引下加速射向阳极，撞击到阳极上涂覆的荧光粉后发出可见光。通过调节栅极的电压可以改变真空荧光管的亮度，大量的真空荧光管排列起来就可组成真空荧光显示器，每个荧光管显示一个像素。在DVD、微波炉等家电的显示板以及汽车的仪表板上都可以看到真空荧光显示器。

A vacuum fluorescent display (VFD) is a display device used commonly on consumer-electronics equipment such as video cassette recorders, car radios, and microwave ovens.

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 an anode coated phosphor that is bombarded by electrons emitted from the cathode filament. In fact, each tube in VFD is a triode vacuum tube because it also has a mesh control grid.