Re: Resolution switching on a monitor
From: Mjolinor (mjolinor_at_hotmail.com)
Date: 08/02/04
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Date: Mon, 02 Aug 2004 17:00:31 GMT
"Bob Myers" <nospamplease@address.invalid> wrote in message
news:1OsPc.6977$Xd1.1387@news.cpqcorp.net...
>
> "Tim Benner" <f0o@psu.edu> wrote in message
> news:celgjf$1lt6$1@f04n12.cac.psu.edu...
> > I know you can change your monitor resolution in Windows from say
800x600
> to
> > 1024x768. The dot pitch of the monitor does not change however, so what
> is
> > happening in the electronics to make this magic happen? Does the width
of
> > the electron beam change? Is it the scan rate that changes when you
> change
> > resolutions? I'm curious for an explanation of what happens in the
> hardware
> > when you make a resolution change. I am talking about the CRT monitors.
>
> It's just the scan frequencies that are changing to accomodate the
> new timing/pixel format. The focus (which is sort of the electron beam
> width, at least as it is seen at the screen) MAY be altered slightly as
> well,
> if the monitor has the capability of storing adjustments for that and
other
> parameters (geometry, convergence, etc.) for specific timings, although
> it is VERY unusual for focus to be included in this.
>
> You're right, the dot pitch can't change - that's a fixed physical
parameter
> of the CRT itself - but the physical dots on the screen (or the holes in
> the shadow mask) really have nothing at all to do with the logical pixels
> of the image, other than being one of the things which ultimately limits
> the resolution (in the proper sense of the word, the amount of detail
which
> can be resolved per unit distance or area) of the product.
>
> Bob M.
>
>
The scan frequencies do not necessarily change at all when you change the
resolution. What happens is that the signal as seen on the VGA plug has (for
example) 1024 discrete values between 2 consecutive line syncs as opposed to
800 discrete values and 768 line syncs between frame syncs as opposed to 600
(assuming non interlaced). What you drive it into is irrelevent. The way
your particular monitor handles this change can vary but generally the more
you pay for the monitor the more changes will take place inside when it
detects the faster data rates including thing like the dynamic focus and
dynamic beam acceleration.
On TFT monitors they specify a "recommended" resolution that the TFT works
best at and when not run at this resolution they get seriously blocky and in
some cases unreadable text.
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