accented char - encoding them depends Module?

i answer myself

if i don't use my string.replace it look good (with accents)
it seems it's a pb with module.
currently i work with TM1640 Module
last week i was working with Max7219
with the max's Module i use an arrayBuffer

SPI2.setup({mosi:B15, sck:B13});
var disp = require("MAX7219").connect(SPI2, B14);

var g = Graphics.createArrayBuffer(8,8,1); // Create graphics
g.flip = function() { disp.raw(g.buffer); }; // To send to the display

g.drawString("Mémé");
g.flip(); // update what's on the display

with the arrayBuffer, accents must be encoded.

But with the TM1640 Module, we drawString directly in the display

var g = require("TM1640").connect({din: NodeMCU.D7, clk: NodeMCU.D5}, function() {
  g.drawString("Mémé");
  g.setContrast(2); // a value between `0` lowest and `7` highest intensity.
  g.flip();
});

is it the cause of the encoding pb?

regards