these displays are 3.3v devices . the only pin that is different is the vcc pin that leads to a 3.3v ldo regulator . my displays function ok with vcc =3.3v . one has a jumper to bypass the regulator if desired but this has not been necessary .
see schematic
ps the schematic shows the mclr pullup resistor connected to gnd , this is wrong it should be vcc




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