Quote:
Originally Posted by sportcoupe
The gauge pictures you attached are LCD (liquid crystal display). Do you mean LED? If so I've never seen a LED voltmeter.
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The DVMs in the picture have seven segment displays, which can use LEDs, or Cold Cathode Gas Discharge, or Electroluminescence, or Incandescence as a light source.
Since the illuminated segments are blue in color, they are probably cold cathode gas or electroluminescent.
LCDs tend to be blank panels without visible segments unless the segments are activated. They either pass/reflect ambient light, or pass/block light from a back-lighting source.
The early LED displays were power hogs, but they have improved considerably since then.
I'm pretty sure the seven segment displays in the DVM battery meters Scotty sells, use red LEDs as a light source, but I have to tear one apart to be 100% sure.