At the risk of sounding smug, yes, the answer is buy a Mac. The Photos app works the same on the Mac. I have a 65" OLED 4K TV in my office. Opening up Photos on there and putting it in Map view is probably what you're looking for. Store your photos in iCloud and they'll be available on your display wall almost as quickly as you take them.
If you wanted this as as semi-dedicated display, you could use something like a Mac Mini with a Magic Keyboard and Trackpad. You could get creative and hide them in a pocket in the wall behind the TV. The size is only limited by your bank account and imagination. Or possibly an Apple TV. I haven't used Photos on the Apple TV yet to know if they show up the same way.
This will work with any Mac that I can think of, all the way down to the budget MacBook Neo.