The H bridge with a DC supply will generate a square wave voltage waveform across the load.
2.
With a square wave voltage, the cathodes spend much more time emitting electrons and exciting the plasma, creating a gain of 5 10 % in lumen output.
3.
A segment required to be " on " has a second square wave voltage applied out of phase to the backplane-it thus has an AC voltage across it.
4.
:: : : : LCD display segments ( in the simple backlit and pasive types used in clocks & clock radios ) have a square wave voltage applied to the backplane ( not to be confused with the backlight ), an electrode common to all segments.
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