[Python] How to run from boot (raspberry Pi4B+) a Tkinter Python Program - error no display...

I have a python program that use the Tkinter Library. It is running from Thonny and from Terminal. I want to launch it when my Raspberry boot. To do this I created a Launcher.sh that is called when the pi boot via crontab.

Everything works but each time it boots I have the error "_tkinter.TclError: no display name and no $DISPLAY environment variable".

I Checked for solution but everyone is talking about "Matplotlib" that I don't use

Here is my Launcher.sh :

sudo pigpiod
cd /home/pi4004/Desktop/Arm_survey
python Arm_survey.py


If I run those commands line by line on terminal it works.

If I run in terminal:

sudo pigpiod
python home/pi4004/Desktop/Arm_survey/Arm_survey.py


I have another error for finding an image that exist...

I tried to modify the autostart in /etc/xdg/lxsession/LXDE Also tried the DISPLAY=:0.0

Nothing works...

Did someone manage to do this ?

Thanks guys

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