[visionlist] 3D LED screen tested for psychophysics

[Ian M Andolina]

<quote who="ben">
> We are looking for a good 3D LED screen (3d because of high refresh
> rate), that has been tested for psychophysics.
> Has anyone tried the Samsug SAM UE-40D7080 (800 Hz)?

We haven't tested it, but it looks unusable from the technical
specifications, most of which are marketing speak (HyperReal Engine, Mega
Dynamic Contrast blah blah blah).

They don't give a refresh rate, but a "clear motion rate"[1], which
weights refresh with image processing interpolation. What 800hz really
means is unclear, do they multiply refresh by how many filters their
processor adds?!? It has an LED scanning backlight, though I don't think
that is where the 800Hz value comes from. Likewise they support "micro
dimming", which I assume is local contrast enhancement which though great
for eye-popping images would be so non-linear for psychophysics to be
unusable.

For the price those fancy TVs are, a Viewpixx lite[2] would be infinitely
better, designed to be used for psychophysics...

Samsung does make a 3D gaming monitor which has been measured to be at
least no worse temporally than a CRT for psychophysics (though wasn't
measured for contrast level reproduction, where it will be worse).

Ian M. Andolina, Dept. Visual Neuroscience, University College London

[1]
http://www.samsung.com/us/article/clear-motion-rate-a-new-standard-for-motion-clarity
[2] http://www.vpixx.com/products/visual-stimulus-displays/viewpixx.html