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And lo on Mon, 22 Oct 2007 12:08:30 +0100, scott <sco### [at] laptop com> did
spake, saying:
>> CRT-wise I generally need to run at 72Hz or higher;
>
> I think that's about average from my limited sample size :-) For me,
> even at 72/75Hz, when showing large white areas I can see the flicker.
> I used to have mine set at 85 IIRC.
>
>> LCDs I can get away with 60Hz, but I get this odd 'sensation' in my
>> eyes/head that something's not quite right.
>
> Is that with all LCDs? Although light output from LCD remains virtually
> constant during a frame, badly designed/adjusted LCDs can have slightly
> different brightnesses between odd and even frames. This is because the
> average voltage needs to be 0V across LC otherwise bad things happen,
> you get around this by applying (eg) 4V one frame, -4V next frame, then
> 4V, etc. Usually each horizontal line is driven with opposite polarity,
> so even if there is some small difference it averages out spatially each
> frame. Even better LCDs drive each pixel with opposite polarity (in a
> checkerboard pattern) so it is virtually impossible to notice any
> flicker even when the +/- are matched very badly.
>
> Standard test patterns we use here are black/white horizontal lines and
> 1 pixel checkerboard patterns, these highlight any problems that would
> otherwise be disguised with areas of plain colour. Maybe give it a try?
>
>> CRT TVs at 50Hz are okay at a distance and for short periods of time,
>> but as I've mentioned the LCD ones just do my head in. Heh all sounds
>> totally contradictory, but that's how I see things not as if I can
>> take my complaints to the designer.
>
> You can tell me :-) Do you have the problems with LCD with static
> images too, or is it just moving pictures?
Not something I've exactly made a scientific test of ;-) Anyway hmm
thinking about it 'name' brand LCD seem better then no-namers. TV-wise
both static and moving, but moving more so.
--
Phil Cook
--
I once tried to be apathetic, but I just couldn't be bothered
http://flipc.blogspot.com
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