Changing laptop screen for higher resolution

One thing you can do is go to a site like LCDS4LESS.com or similar, and look up your model and see what they have- if a screen was made for that model with higher res, they will generally have it.
I have upgraded some D830 units to x1200 screens that way, and they just fit right in and worked.
that being said, it is a lot of work and dangerous for your notebook if you do not have experience with such upgrades. If you feel confident - Grreat! if not, Get help.