Max amps/volts for a 7 Segment LCD
Segment displays with a multiplex such as 4:1 or 1:1 use AC signal, in fact DC signal can destroy the LCD in short time. Segments can operate as low as 2.7 volts and as high as 5V.

Here is an article about the damage DC offset voltage can do to a display and now to avoid it. 

Note: I am a design engineer at Focus LCDs and am supplying the link as a supporting document.