[visionegg] Re: DLP projectors and increased frame rate

Dear Jordanna,

Thank you very much for your help.  Could you please tell me the model
number of your projector?

Also, I'm not sure I exactly understand what you mean.  If you display
a single-color stimulus, it goes from 100% for 1/3 of the cycle to 0%
for the other 2/3, but if you display a grayscale stimulus, it
oscillates between 100% and 50% luminance, but never drops to 0%?  Is
this correct?

Thanks again!

Luke


On 8/14/05, Jordanna Sprayberry <jdhenry@xxxxxxxxxxxxxxxx> wrote:
> I don't know if this information will help...
> 
> I use a boxlight DLP projector for my experiments. Prior to launching
> these experiments we hooked an optical to a rear projection screen to
> look at luminance out put. The overall luminance levels never drop
> below 50 %, but there is a 100-50% flicker at a rate of 360 Hz (when
> displaying a grayscale stimulus, because it uses all three channels).
> Each individual color channel flickers (from 100 to 0 %) at 120 Hz.
> That is all the projector knowledge I have.
> 
> good luck!
> 
> jordanna
> 
> On Aug 13, 2005, at 8:49 AM, Luke Sjulson wrote:
> 
> > hello,
> >
> > There was a discussion in the archives of this mailing list saying
> > that someone had heard of someone removing the 3-color wheel from a
> > DLP projector, creating a white light projector with triple the frame
> > rate.  Does anyone on this list have direct experience with hacking
> > DLP projectors, or know of anyone who does?  I'm trying to find a DLP
> > projector where I can remove the 3-color wheel and encode three
> > subsequent frames into the R, G, and B channels, but I want to make
> > sure that I can find a projector where each frame is split into equal
> > thirds.
> >
> > Alternately, if someone knows of a 3-chip DLP projector running at
> > over 100Hz that doesn't cost $30,000, that would be great too...
> >
> > Thanks in advance!
> >
> >
> > Luke
> >
> > --
> > Lucas L. Sjulson
> > Cornell/Rockefeller/Sloan-Kettering MD/PhD Program
> > Laboratory of Neural Systems (Miesenboeck Lab)
> > Yale University School of Medicine
> > 295 Congress Avenue, Rm # 247
> > New Haven, CT 06519-1418
> > (203) 785-2311
> > ======================================
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> 
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-- 
Lucas L. Sjulson
Cornell/Rockefeller/Sloan-Kettering MD/PhD Program
Laboratory of Neural Systems (Miesenboeck Lab)
Yale University School of Medicine
295 Congress Avenue, Rm # 247
New Haven, CT 06519-1418
(203) 785-2311
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