I tried looking for automotive grade LCDs with high DPI. Couldn't find all that much, but came across this press release from Mitsubishi[1], indicating they released something that starts to approach retina only last summer.

As mentioned, in a car you really want automotive grade components, at least due to the heat and vibration it needs to sustain.

[1]: https://www.mitsubishielectric.com/news/2019/0423-b.html