Green display screen - iPhone 13 pro max

Hello rahuf144,

Welcome to Apple Support Communities!

We want to make sure the display is working perfectly for you.

Try these steps in order to toggle your screen settings to see if that has any impact:

"Turn True Tone on or off

On supported models, True Tone automatically adapts the color and intensity of the display to match the light in your environment.

Do any of the following:

• Open Control Center, touch and hold , then tap  to turn True Tone on or off.
• Go to Settings  > Display & Brightness, then turn True Tone on or off."

This Apple Support page has the full details and additional steps: Adjust the screen brightness and color on iPhone - Apple Support

If the issue remains, does the same thing happen after a normal restart? Did this randomly happen or after you made changes to the display settings?

If it's a hardware issue with green lines on the display that remain after a restart, use this link to start a service request: iPhone Service & Repair - Apple Support

We hope this helps to quickly resolve the issue causing the green display.

Please let us know if you have further questions.

Cheers!