MBP (early 2013) the opening screen's picture is way over contrasted (it's picture is super saturated).

Connect to an external display and see if you have same kind of output.

This can help to isolate.

Also try safe mode (Basic Troubleshooting method)

How to use safe mode on your Mac - Apple Support (Takes more time to boot)

Note: Safe mode prevents your Mac from loading certain software as it starts up, including login items, system extensions not required by macOS, and fonts not installed by macOS. It also does a basic check of your startup disk, similar to using First Aid in Disk Utility. And it deletes some system caches, including font caches and the kernel cache, which are automatically created again as needed.

Without seeing the issue it is hard to say, but usually that means the LCD Panel is bad and the built-in Display will need to be replaced. You can confirm by seeing whether the issue also occurs on an external display. If the external display is fine, then the built-in display is bad. You can also have Apple or an Apple Authorized Service Provider examine the laptop to confirm, although they won't be able to repair it since the 2013 model is "Obsolete".