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'POV - was Multiplexing Seven Segment Displays [OT]'
1997\09\16@120050 by mikesmith_oz.nosp*m

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On 16 Sep 97 at 10:49, Martin R. Green wrote:

> Sounds like you are one of those rare souls with a very short
> retinal persistence.  I find no noticeable flicker, or "strobe", on
> any LED displays where all characters are scanned on less than
> 1/30th of a second.
>  You are a prime example of doing "worst case" design, and going for
>  a
> 1/40th or 1/50th of a second full scan.

Supermaket ones drive me crazy.

>
> I have heard of people that get headaches watching commercial movies
> because the 1/24th of a second frame rate flickers dramatically to
> them.

Um, maybe, I don't go often.  I recall sitting thru the entire
StarWars trilogy (when it was first released) - it wasn't my head
that ached - bit lower.

What scan rate do you run your monitor at? (vertical) - Mine's going
nicely at 85 - thats nice to look at straight on.
MikeS
<mikesmith_oz@nosp*m.relaymail.net>
(remove the you know what before replying)

1997\09\16@173357 by Herbert Graf

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-----Original Message-----
From: Mike Smith <mikesmith_oz.nosp*spam_OUTamTakeThisOuTspamRELAYMAIL.NET>
To: .....PICLISTKILLspamspam@spam@MITVMA.MIT.EDU <PICLISTspamKILLspamMITVMA.MIT.EDU>
Date: Tuesday, September 16, 1997 12:03
Subject: POV - was Multiplexing Seven Segment Displays [OT]



{Quote hidden}

   Same here, some microwaves aren't great either.

>> I have heard of people that get headaches watching commercial movies
>> because the 1/24th of a second frame rate flickers dramatically to
>> them.
>
>Um, maybe, I don't go often.  I recall sitting thru the entire
>StarWars trilogy (when it was first released) - it wasn't my head
>that ached - bit lower.

   I don't really notice it much in movies, except when there is panning
going on, then it is REALLY bad.

>What scan rate do you run your monitor at? (vertical) - Mine's going
>nicely at 85 - thats nice to look at straight on.

   My monitor only runs at 60, I guess I am one of the lucky ones that
notices it, but it doesn't effect me much, I often am infront of this screen
most of the day. TTYL

1997\09\16@181931 by John Payson

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> >> I have heard of people that get headaches watching commercial movies
> >> because the 1/24th of a second frame rate flickers dramatically to
> >> them.
>
>     I don't really notice it much in movies, except when there is panning
> going on, then it is REALLY bad.

Modern movie projectors flash the screen twice for each frame (resulting in
a 48hz flash rate); 8mm projectors flashed 3x/frame (resulting in a 54Hz
flash).  For stationary pictures, the double-flash helps reduce flicker.  It
has the annoying side-effect, however, that moving images appear "doubled"
and blurry.  If you focus on any light object as it travels across the screen
(and track it with your eye) you'll notice that you see "two" of them while
they are moving.  The same thing also happens on scrolling displays which are
scanned more than once per scroll (the worst is displays that scroll a line at
a time at about 20-30fps); anyone driving scrolling displays with a PIC (or
any other CPU) should keep that in mind.

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