600 Hz Subfield motion displays

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Edward Ryklin

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Oct 16, 2011, 7:37:14 AM10/16/11
to psychopy-users
I just heard about a plasma video display that can refresh at 600 Hz.
Has anyone else looked into it?

Samsung model PN43D490

here's a link:

http://www.samsung.com/us/function/search/espsearchResult.do?input_keyword=PN43D490&keywords=PN43D490

Jonathan Peirce

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Oct 16, 2011, 7:52:39 AM10/16/11
to psychop...@googlegroups.com
Sounds too good to be true. And is :-(
It isn't actually a refresh rate of 600Hz but, as far as I can make out,
they've got a technology of pulsing the plasma pixels 10 times per frame.

http://www.tvlampsnbulbs.com/2009/03/what-does-600hz-subfield-motion-mean/

If we had control over those pulses it might be useful. But I imagine we
don't. Still, might give the CRS team something to think about. Maybe
the technology, used another way, could be used to generate extra bits
out of a plasma display...? Temporal dithering at 600Hz could be neat.

Jon

--
Dr. Jonathan Peirce
Nottingham Visual Neuroscience

http://www.peirce.org.uk/


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Edward Ryklin

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Oct 18, 2011, 10:32:13 AM10/18/11
to psychopy-users
I see, it's not updating the pixel's value 600 times a second, it's
just refreshing the current value 10 times faster to reduce decay.
That's too bad for us. What about these new 240Hz LED displays...?

On Oct 16, 7:52 am, Jonathan Peirce <jonathan.pei...@nottingham.ac.uk>
wrote:
> Sounds too good to be true. And is :-(
> It isn't actually a refresh rate of 600Hz but, as far as I can make out,
> they've got a technology of pulsing the plasma pixels 10 times per frame.
>
> http://www.tvlampsnbulbs.com/2009/03/what-does-600hz-subfield-motion-...
>
> If we had control over those pulses it might be useful. But I imagine we
> don't. Still, might give the CRS team something to think about. Maybe
> the technology, used another way, could be used to generate extra bits
> out of a plasma display...? Temporal dithering at 600Hz could be neat.
>
> Jon
>
> On 16/10/2011 12:37, Edward Ryklin wrote:
>
> > I just heard about a plasma video display that can refresh at 600 Hz.
> > Has anyone else looked into it?
>
> > Samsung model PN43D490
>
> > here's a link:
>
> >http://www.samsung.com/us/function/search/espsearchResult.do?input_ke...

Jonathan Peirce

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Oct 19, 2011, 7:24:12 AM10/19/11
to psychop...@googlegroups.com

On 18/10/2011 15:32, Edward Ryklin wrote:
> I see, it's not updating the pixel's value 600 times a second, it's
> just refreshing the current value 10 times faster to reduce decay.
> That's too bad for us. What about these new 240Hz LED displays...?
Similar as far as I can tell. But check the tech specs carefully. I
think it's a 120Hz LCD panel with an LED backlight that flashes twice
per frame.

Also watch out for monitors designed primarily as a TV - even though
they will accept computer input, they might not even allow for 120hz
genuine refresh, because for a TV that isn't useful. You're likely to
have more luck with something describing itself as a monitor than a TV.

Jon

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