recently my iphone 13 pro max was updated overnight by auto update on ios 16.6. today my display went on green screen i dont understand this issue happened after software update

Hi there PMdarji,

If you're unable to get to the Home Screen of your iPhone 13 Pro Max, you can see if force restarting may resolve that for you. Below show how to do so:

Force restart iPhone

If iPhone isn’t responding, and you can’t turn it off then on, try forcing it to restart.

1. Press and quickly release the volume up button.

2. Press and quickly release the volume down button.

3. Press and hold the side button.

4. When the Apple logo appears, release the side button.

Those steps are from this article: Force restart iPhone - Apple Support

If the issue continues after force restarting, then you can contact Apple Support for further help with this. You can reach them using the following link: Apple Support

Take care.