[visionlist] 3D LED screen tested for psychophysics

[Joe MacInnes]

The 800 Hz is usually advertised as 'perceived refresh' and yes it does
interpolate the image at the expense of latency.  I haven't looked at this
TV in particular, but the equivalent Sony has a real refresh of 120 or 200
Hz.  The LED local backlighting has a strong advantage in nearly 0cd/m black
levels.  On most of these TV's you get remove the extra features and
interpolation by switching to 'Game mode' which has many similar demands to
psychophysics.
Joe

On 13 October 2011 19:11, Ian M Andolina <i.andolina at ucl.ac.uk> wrote:

> <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
>
> _______________________________________________
> visionlist mailing list
> visionlist at visionscience.com
> http://visionscience.com/mailman/listinfo/visionlist
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://visionscience.com/pipermail/visionlist/attachments/20111013/acc3e2fa/attachment.htm>