What is the proper way to operate the grids on a VFD? Answered
I have a VFD removed from an old DVD player, and I am currently trying to construct a driver for it. So far I have worked out a the pinout and a suitable cathode heating voltage and have determined that 20-30V is sufficient to properly light all the segments.
As for the grids, I am unsure what the proper voltage to apply in order to light/blank each section. Currently, leaving the grids unconnected or at 0V effectively blanks all segments, and connecting the grid to the anode voltage lights the section. However, other designs seem to put the grid to 0V to allow the section to light and apply +/-15V or so to absorb/block the flow of electrons and prevent the section from lighting.
Is it alright to pull each grid high and connect it to 0V to blank the section, or will there be problems when trying to drive each section?
Thanks in advance for any help.
Also, is it worth the extra circuitry needed for an AC heater voltage for a display this size (under 4.5" x 1"), if so, what is a suitable frequency?