Thinkpad in the sun

I want to work in a place that has a decent amount of sun (near the beach). I've tried it with my t440p and p50 and it's ok, but I struggle reading the screen. Can I get a panel that works will in the sun (for any machine, I'll buy one)? Or are there any new machines that work well in the sun?

I've read a "transreflective" panel works well, but I don't see something that would work for a laptop. What other "types" of panels would work well in the sun?