I made this schematic and I wrote this code. But, once again !, I see nothing on display. Suggestions ?
I strongly hope you have powered your pic with 3.3 V and not with 5 V.

If you did, than there is a high possibility that the display is burned.

If you powered pic correctly then add to your circuit 2 pullup resistors (4.7 K)

from +3.3 to SDA and from +3.3 to SCL.

Add DEFINE I2C_HOLD 1 to your code.

Al.