Unless you need to do serious math or process really fast inputs, the low voltage version would probably do fine in that regard, but as GlennM points, out, the display expects 6 to 7 volts and you would need a voltage booster anyway and if you were to save power, one which can be turned completely off. In addition, this display uses a backlight which consumes more power than anything else.Interestingly, the LCD displays, other than those designed for mobile phones, if they are to run from 3.3V contain their own "charge pump" to generate the 4.5V that the display itself requires.
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