Shameless plug: I build devices like that and sell them. Battery powered. https://framelabs.eu/en/product/artframe-31/ https://framelabs.eu/en/product/artframe

Shameless plug: I build devices like that and sell them. Battery powered. https://framelabs.eu/en/product/artframe-31/ https://framelabs.eu/en/product/artframe-31/ I use the 31.2" panel because it is 40% cheaper and has higher DPI, but the 42" panel is also possible.