Vacuum FluorescenceDisplay (VFD) is a self-emitting display technology that realizes the principle of cathode ray tube (CRT) in each pixel.
Light emission is achieved by electrons released in a heated cathode and accelerated towards the anode in a cathode-grid-anode construction. On the anode are the phosphors which emit light when the electrons strike them. The grid between the cathode and anode has a voltage of about 50 V, which is used for control and acceleration. The anode voltage is 100 V.
Since the phosphors are on the side facing the viewer, the luminance is very high, reaching values of 10,000 cd/sqm. In addition to the high luminance, VFD displays have a large viewing angle and excellent contrast.