'Freezing' image to HDMI Output

[creosote22]

For some reason, this is an impossible thing for me to find the correct google terms for. Or maybe there is no easy solution.

Situation is a classroom scenario where teachers are used to a projector and want an easy way to freeze the image on the new displays (TVs).

Of course, there is extended display, but they tend to have their back to the TVs/wall when teaching so just want a mirror of their screen. And then be able to freeze the screen on the TV and continue working privately.

We have Chromecasting, which can fix on one tab, as well, but if they are displaying something besides a tab this is an issue. Wireless is also not as stable as our wired setup.

Found a really old program called Ultramon which freezes the image, but it's slow and laggy, almost unusable.

Anyone have a solution?

 

[helpstar]

can´t the beamer do that for you? "freeze" button on the remote
some smart boards can do this as well

 

[creosote22]

I don't think it's a common thing for TVs to have a freeze button (?). Irregardless, these don't have that option.

 

[helpstar]

nearly all TVs with the option to record can "pause" the picture