There will always beeoptions without. Some tvs are used in industrial settings to show safety information. If someone dies and the tv was, showing ads instead of safety information there will be big lawsuits.
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
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.
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.
