If you are interested in a portable screening projector, this is a full cost 1000 lumens LED solution. I have been useing the older 500 lumens version of this projector for a few years https://amzn.to/2VvnmhC it works well and most importantly you can run it off an external laptop battery https://amzn.to/2WL1LmP
This battery is cheap and is the only one I can find that works with solar, will charge off USB and 12v solar panal. You could do this cheaper with a LED projecter from china but its toss a coin that the projecter will work in a good way, and the specks are half lies.