I looked in to this about a year ago and found that many digital sign models either (a) omitted relatively basic features like HDR, HDMI ARC, or CEC or (b) weren’t 10% or even 50% higher priced, but 200-300% more (compared to fairly high-end consumer models, not to the cheapest consumer model).

Make sure they actually do what you want, even things that every consumer model has had for years. The situation may have improved in the last year. Also, I only looked at 82-85” models, so the situation may be better on smaller models.

The price premium is there but also plenty opportunities to shop around for a last year's model https://www.idealo.de/preisvergleich/ProductCategory/31784.h...

for example, Samsung QP82R is an 8k "TV" for €3500.

My worry is can I it decode all standard codecs from USB source? Apparently Samsung in 2017 removed DTS and DivX /Xvid support. Decoding on the TV is key as only then you get the best motion interpolation algorithms. Playing from Raspberry via HDMI you don't get these.

everything you said is more or less right, but not everything is a problem.

- There are more difficult to buy, as they are a b2b product, but on amazon they sell some models.

- brightness is higher, depending on the purpose of the monitor, there are monitors for sun facing storefronts, which are way brighter, but those also have fans and are noisier. The ones purposed for indoor are more or less the same brightness of the tvs, and sometimes have sensors for changing the brightness depending the environment, which is actually a plus. - no antenna, some offer iptv, and others actually are android or linux based, so you may even install some apps, but you must configure them manually so much easier to use an external player.

- they are tougher panels, but they are designed for showing ads and static content, so no dark blacks, less contrast and usually less colour gamut coverage.

- not many 4k panels, the are designed to see from a distance, so many are fhd instead of 4k.

- another drawback is that many doesn't have speakers, so you have to hook up your own sound system.

Anyway, I'm in front of a storefront samsung om55n and watched some content and it's ludicrous, at night and the room seems illuminated like during the day.

Samsung also has a business line of tvs, are more like the domestic ones but designed for longer operating times and you can configure them to show slideshows or to have a ticker overlaped. They use the same basic tizen system, but the home screes is different and I doubt you will find ads on them.

This is rather interesting. My biggest doubt is how many HDMI inputs they have and if it's possible to easily switch between them. But I'll definitely look into this kind of devices when it's time for me to update my current TV. (And no antenna input means the Italian law doesn't consider it a TV, so I can avoid the TV tax)

3 hdmi and a 1 displayport the one I have in front of me. It uses the same remote than the cheap domestic and hospitality ones.

You don't need commercial signage. Sceptre TVs come with stands, Walmart sells them, price is average, has standard TV connectors and remote.