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Posted by Jeff Rife on 04/16/06 03:21
Gene E. Bloch (spamfree@nobody.invalid) wrote in alt.tv.tech.hdtv:
> > Yes, but at some point it changes. And that change takes a long time.
> > So long that there are almost two complete progressive scans of the
> > display before the first pixel "changes" to what it should have been
> > based on the *first* frame.
> >
> > Think about that for a moment.
>
> Document that, for a change.
Um...15ms is pretty much standard for LCD pixel response times. Some
newer ones spec 8ms, but benchmarks show that is optimistic. 15ms equals
1/66th of a second. If the frame rate is 1/60th of a second (typical
for LCDs), then the math should be obvious enough for even you to see
the result.
> > And, if you had a CRT with the same 15-30ms persistance, you would see
> > *exactly* the same effects as on an LCD, which would include smearing.
> > On the other hand, even though an LCD is continuously "on", if the pixel
> > update time ever drops low enough, you would see some of the same effects
> > that you see on a CRT (including strobing and flicker at low frame
> > rates). They would not be as pronounced unless you had frames that
> > changed quite a bit, but they would still be there.
>
> You seem to have finally come around to (almost) understanding what I
> am saying, even though you are phrasing it as proving that I am wrong.
All of this started because I said it was silly for Blu-Ray (or HD-DVD)
to output 24p natively, and just as silly for a display to accept it,
because 60p is the current progressive standard, and dropping to 24p
would result in flicker.
You stated that LCDs will ever show flicker, and that's where we disagree.
Current LCDs won't, but faster LCDs with slower frame rates will show
flicker. Right now, long pixel response times, persistance of vision,
and *never* having less than 60 frame rates keeps flicker away. A future
LCD that tries to compete with CRT in lack of smearing (with ultra-fast
pixel response times) will find it has to then deal with some of the CRT
issues if they also accept and display 24fps natively.
--
Jeff Rife |
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