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In some cases, those places buy non-retail "kiosk" televisions. They're hard to search for on the manufacturer sites.

> non-retail "kiosk" televisions

The more correct term would be Digital Signage displays, eg. [1] - they often run on high voltages though so it's better to be sure when screwing around with them

[1] https://www.samsung.com/us/business/displays/

I've been buying the Samsung QB series at work lately. They're advertised as signage, and do function in more or less "dumb" mode - they work fine with no network connection. But they do run Tizen OS, which is less dumb than I'd like. Also worth mentioning that they're real nice, but also pretty spendy.

Yeah, they just cost a ten times more

Those usually have shit color accuracy and high black levels, but they are bright.

There are OLED digital signage displays, which won't have any issue with black levels. Colors might need calibrating but I doubt they use different panels for these from equivalent consumer TVs.