The println in lcd.println("Starting up..."); is giving you those weird characters on the end. Change it to lcd.print("Starting up..."); to fix that problem.
And you don't need two lcd.Init() in your setup function, nor do you need to call lcd.backlight() in the loop function.
your the best 
thx.
Will leave the lcd.backlight() in there, because otherwise my startup... is without a lit display.
many tnx.
HazardsMind:
And you don't need two lcd.Init() in your setup function
It's a bad sign. If that's from the library example (and it was, when I saw the same thing) then it means that whoever wrote the library had trouble getting a reliable init, hence he stuck in hacks such as initing twice. It was when investigating hacks like these that I discovered common library bugs I described in my Amazon review linked above.
I had the same problem !
The chinese library is good.
In arduino software, there are 2 libraries locations, one on local folder, another in "My document/Arduino". In this last one, I found a LCD library, I deleted it and delete all LCD libraries on local folder, and installed manually LiquidCrystal_I2C2004V1_Chinese in local folder, renamed it "LiquidCrystal" and now it's good
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
uint8_t bell[8] = {0x4,0xe,0xe,0xe,0x1f,0x0,0x4};
uint8_t note[8] = {0x2,0x3,0x2,0xe,0x1e,0xc,0x0};
uint8_t clock[8] = {0x0,0xe,0x15,0x17,0x11,0xe,0x0};
uint8_t heart[8] = {0x0,0xa,0x1f,0x1f,0xe,0x4,0x0};
uint8_t duck[8] = {0x0,0xc,0x1d,0xf,0xf,0x6,0x0};
uint8_t check[8] = {0x0,0x1,0x3,0x16,0x1c,0x8,0x0};
uint8_t cross[8] = {0x0,0x1b,0xe,0x4,0xe,0x1b,0x0};
uint8_t retarrow[8] = { 0x1,0x1,0x5,0x9,0x1f,0x8,0x4};
LiquidCrystal_I2C lcd(0x20,16,2); // set the LCD address to 0x20 for a 16 chars and 2 line display
void setup()
{
lcd.init(); // initialize the lcd
lcd.backlight();
lcd.createChar(0, bell);
lcd.createChar(1, note);
lcd.createChar(2, clock);
lcd.createChar(3, heart);
lcd.createChar(4, duck);
lcd.createChar(5, check);
lcd.createChar(6, cross);
lcd.createChar(7, retarrow);
lcd.home();
lcd.print("Hello world...");
lcd.setCursor(0, 1);
lcd.print(" i ");
lcd.write(3);
lcd.print(" arduinos!");
delay(5000);
displayKeyCodes();
}
// display all keycodes
void displayKeyCodes(void) {
uint8_t i = 0;
while (1) {
lcd.clear();
lcd.print("Codes 0x"); lcd.print(i, HEX);
lcd.print("-0x"); lcd.print(i+16, HEX);
lcd.setCursor(0, 1);
for (int j=0; j<16; j++) {
lcd.write(i+j);
}
i+=16;
delay(4000);
}
}
void loop()
{
}
I user this code , but my display just have two line buut not thing in this, can any one help me please, thanks