I think it would be good to have a new Cover device class that encompasses a range of TV concealers/lifts. The following examples are off the top of my head:
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TV beds have been around for quite a while now, but they’ve only recently started becoming smart, at least in the UK. I have just set up an ESPHome for my own TV bed so that I can raise and lower the TV with voice commands instead of fumbling for the remote. I’ve seen several blog and forum posts from others doing the same.
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Under-cabinet pop-out TVs
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Hidden projectors
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“Rollable” OLED TVs
I think that this warrants its own device class for several reasons, but mainly because they become an extension to the TV. You might use verbs like “reveal” or “put away” that would not make sense on the other device classes. None of the existing class icons easily convey a concealed display either (apart from maybe a projector screen).
I think screen would be an appropriate noun to use that would include monitors, TVs, projectors and projector screens.