A vacuum uorescent display (VFD) works in much the same way as an old
fashioned television tube and screen. It has some benets for vehicle use
because it produces a bright light (which is adjustable) and a wide choice
of colours. Figure 12.22 shows that the VFD system consists of three main
components. These are the lament, the grid and the screen with segments
placed appropriately for the intended use of the display. The lament forms the
cathode and the segments the anode of the main circuit. The control grid is
used to control brightness as the voltage is altered.
When a current is passed ...
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