>In the case of the smart tv it's actually because you didn't really pay the full price of the tv

How can the consumer know, if it is not disclosed?

And when every TV manufacturer is doing "ads in your smart TV", there is no incentive to not sell it at full price AND show you ads.

I think that a good step would be to require a sizeable disclaimer on the box/marketing material stating that it is ad-supported/tracking-supported. That way it is much easier for consumers to know why the price is as cheap as it is.

Commercial displays are not more expensive because they don't have ads - that's an absurd suggestion. They are more expensive because they have higher requirements. They need to be running for at least 8 hours per day without issues, but often 24/7, as opposed to the usual 4-6. That's the main difference.

They also have to deal with direct sunlight and a wider range of thermal conditions. Commercial displays are often placed in shop windows, the panel needs to stand up to that, and the electronics need active cooling for when the chassis warms up.

That might be true, but it's not an "absurd suggestion." Amazon will sell you a Kindle for nearly 20% cheaper if you let it show you ads.

In terms of actual dollars, those ads are worth about 20. The value isn't much different for a TV.

When many commercial displays are hundreds of dollars more, it's pretty absurd to suggest ads are a large factor.

Only hundreds of dollars? Where do you find those? I would by a dumb panel on a trustworthy device for mere hundreds more.

Iiyama? They sell great high-contrast LCDs in various ratings, typically starting at 8/5 and up to the obligatory 24/7.