Anyone familiar with these vintage touchscreens?

[Patrick Finnegan]

On Mon, Oct 21, 2019 at 12:49 PM Paul Koning via cctalk
<cctalk at classiccmp.org> wrote:
> > And what sort of technology was that screen using?  I expected to see
> > the grid array of outer infrared LEDs and detectors that I vaguely remember
> > from that era, but I don't see that here.  Someone was making a tube
> > that was coarsely touch-sensitive?
>
> Theinfrared array you're thinking of was invented at PLATO, for flat panel (plasma) displays.  They don't work for CRTs because of the convex screen.

I've got a VT100 with a (3rd party?) IR-LED based touch screen which
fits into the normal black bezel around the tube.

Pat