Re: LCD (large -- TV-ish) monitors with SOLID front surface?

On 6/15/2024 4:22 PM, Jasen Betts wrote:

On 2024-06-14, Don Y <blockedofcourse@foo.invalid> wrote:
 

The front polarizer of a typical LCD TV ("really big monitor") tends to
be flimsy.  A thin piece of glass/lexan might work in that it could
distribute the forces over a larger area -- providing "localized stiffness"
instead of OVERALL stiffness.
>
Imagine yourself writing on a whiteboard; your motions tend not to be
delicate and deliberate but, rather, sharp and erratic.  I need to protect
the LCD display from your "abuse".
>
At the same time, ensuring that the protective layer doesn't end up scratched
and cloudy from repeated "markings".
>

If it was stiffer than the display glass you'd need to disassemble the
display to install the protector. (if wanting to mount it using adhesive)
>
Or else live with a gap between the display and the protector (increasing
parallax and potentially collecting debris)

>
The parallax is disturbing.  Your "ink" appears *in* the display but your
"writing actions" occur outside the protective layer.  So, if there's a
schematic, program listing, photoplot, etc. being displayed on ("in")
the display, it requires a bit more effort to make your marks where you
want them, relative to what is already being displayed (and *updated* to
include your marks).

 Have you switched fron non-visible ink to virtual ink?  Do you
actually want a touch sensing screen?

The pen that you *hold* has NO ink in it (hence "invisible ink").
I.e., I can scribble on the (current plasma) screen for hours and
you would never know where I had scribbled.
But, the pen *creates* "virtual ink" that appears in the video
signal displayed on ("in") the display.
If you start by displaying a white field, then a casual observer
thinks he is watching a person scribbling on a real whiteboard
(and wondering how the "market pen" keeps changing colors to suit
the wishes of the writer).
A *touch* screen would be nice but would complicate things in
that getting more than one (50-90 inch diagonal) would be costly.
My approach allows me to use a screen wherever I happen to be
(though this has had to be plasma, to date, due to the ruggedness
constraint)
A sheet of glass/lexan would actually be ideal as I could arrange
to have one of suitable size wherever I happened to be (to fit
whatever TV was available)!

If you think of a TV weatherperson interacting with a green-screen,
you can get a sense of how that sort of awkward interface affects
the precision of their annotations (anything "exact" is done off-line
where it can be revised over time; live updates tend to be really crude,
by comparison).

 These days they use actual displays instead of chromakey. Sometimes
even touch sensing displays; there's funny videos of the presenters
discovering this:  eg. https://www.youtube.com/watch?v=0Goz0PnhEg8

They are still green (or blue)-screens, here (local).  The presenter is
always looking off to (e.g.) stage left to see the composite signal that
is being broadcast (i.e., with HIM/HER *in* it) to verify that he/she is
pointing and gesturing appropriately.
<https://www.youtube.com/watch?v=PUkZsfqPmX8>
National broadcasters use more sophisticated displays.

If parallax is the only option, I can use an alternate technology that
eliminates it -- in favor of other shortcomings.  :<
>
[I *really* don't want to use another plasma TV as they throw off
a lot of heat so you can't ALSO use them as a practical TV (which
would eliminate the need to STORE the thing when not in use!)]

 Not knowing your actual requirements I'm going to refrain
from making specific suggestions.