On April 22, 2005 09:30 pm, Robert Rolf wrote:
> I have 'normal' persistence so low refresh rates don't bother me.
> But I can also spot LED lights or other strobed lighting (LED sign
> boards) because they make distinct spots of light as I pan my
> viewpoint across them.

They also lack persistence, which you may note if you were to compare, 
let us say, taillights and turn signals on cars, tucks, buses, etc.

> Some people do appear to have much shorter persistence than normal.
> One friend of mine, who was a military pilot, can't stand to look
> at my CRTs because they flicker too much for him. Having shorter
> persistence, and so lower blur when flying near ground,
> is probably an advantage to a pilot. I wonder what the chemistry
> difference is.
>
> E... has no problem looking at laptops since their LCDs are very
> slow to respond (80msec IMS), so I rather doubt that laptops can be
> causing headaches from the REFRESH. They may be causing headaches
> because of seating posture or other mechanical issues (close focus
> etc.).

The article (which I couldn't find) was referring to the refresh rate of 
the fluorescent tube. Some laptops use PWM to brighten/dim the screen.
The refresh rate of the LCD itself is rather slow because you are 
working on a liquid. Liquid has mass, therefore rather slow. I would 
not expect an LCD screen to refresh any higher than, let us say, 15Hz, 
and even that may be an optimistic figure.

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