You can utilize a blank, white wall for a monitor, And it will do the job just good. bear in mind the wall's shade will impact the colours from the picture. such as, a tan wall will skew hues toward the brown https://www.tuzkuz.com/products/mini-projector-hy300-pro-4k-android-11-dual-wifi6-260-ansi-lumens-bluetooth-50-1080p-for-home-cinema-and-outdoor-use