Tablet recommendations as a portable screen

Hi I'm looking for a cheap and big screen tablet to conect to my 13.4" laptop as a second screen to help me study outside (best option for my focus). Preferably with the lowest weight possible and bigger screen as possible.

I looked into portable screens but the ones I found weight around 1.6kg (the lightest). So I figured a tablet will be around 400-700grams which is lighter and better.

I'd also the tablet to has pen support.