[rbanffy]

It becomes more interesting when you couple a flexible display with it.

[Wowfunhappy]

...especially if that display could be a touch screen...

[joezydeco]

It's been tried with fluid instead of air.

https://www.engadget.com/this-oled-screen-can-fill-with-liqu...

[robocat]

Link to video from article:

https://youtube.com/watch?v=j_rErbhxNFM

They show a few other interesting actuators in first 20 seconds of video.