I am looking to purchase a 634 4x20 serial LCD and the the negative backlit version caught my eye. However, to actually see the characters, does the backlight has to be on all of the time? If so, does it still use the same current draw as the standard backlit display (525mA or so)? I am concerned because this project will be running off of a 9v battery regulated down to 5v. Any info please?
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