Martin R. Green wrote:

> The moving beam on a CRT introduces new visual problems that are not
> present with a simple "all-at-once" display like a MUX'd display or
> motion
> picture.  As you state, 70Hz is borderline for a CRT, especially if
> your
> monitor forces you to use interlaced scanning (my old NEC 3D at
> 1024x768
> required 72Hx interlaced).  Luckily my new Viewsonic 21" gives me 87Hz
> @
> 1280x1024.
>

Do you need higher refresh rates, because the monitor has a large area
to refresh?The 7seg would be very small...

> A 50Hz scan should be sufficient for a LED bar, but there is no reason
> you
> can't go to 100Hz if you want.

After all the lightsbulbs in SA all run off 220V 50Hz. Only sometimes
you detect a flicker - usually when there's a power dip. I suppose it's
because the filament does not dissipate its rated power and
illuminescence....

Cheers!

--
Eric van Es               | Cape Town, South Africa
mailto:vanes@ilink.nis.za | http://www.nis.za/~vanes
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