Electronic – Source a really big LCD character display

The only relevant info I managed to find is this discussion

According to the last comment from the owner of the board

I tried to print the ascii table from 0 to 255. CR, LF, BS, TAB works. other non printable characters are a no go. other characters are perfect though (well the extended characters are limited).

So I wonder if a CR+LF (carriage return, line feed) sequence has an effect of pushing the printed characters out of the screen, that is

for (int i=0; i < 4; i++) 
{
  Serial.print(13);  // carriage return (CR)
  Serial.print(10);  // line feed (LF)
}

or maybe

for (int i=0; i < 4; i++) 
{
  Serial.write(13);  // carriage return (CR)
  Serial.write(10);  // line feed (LF)
}

If these don't work then the alternative I see is to apply the solution that is described in the start of the linked discussion and send 40 backspace commands:

for (int i=0; i < 80; i++) 
{
  Serial.print(8);  // print 40 times backspace (BS)
}

or you may need

for (int i=0; i < 80; i++) 
{
  Serial.write(8);  // print 40 times backspace (BS)
}

Your LCD's LED typically accepts 4.2~4.6V. It should be self regulating, so no further resistor needed. You have 11V or 5V available. Below are the three options available. First is use a Adjustable regulator from 11V. The Second is use a fixed 5V regulator and then a regular silicon Diode (1n4001 or similar) to bring it down another ~0.7V. In either mode, the regulator wastes 1 Watt of heat, a heatsink might be recommended (attach the regulator to the module's metal casing is one method).

Or as mention, tap off the already existing 5V regulator, and just throw on the diode. 0.160A is not exactly a large load, it should be fine.

^{simulate this circuit – Schematic created using CircuitLab}