Archived from groups: comp.sys.ibm.pc.hardware.video (
More info?)
On Wed, 10 Nov 2004 02:33:03 GMT, "Bob Myers"
<nospamplease@address.invalid> wrote:
So, is it something I should just learn to live with or should I take
the thing back? Seems like no one else in the forums I frequent
(where people own this panel) see this problem with theirs (or maybe
they're not really looking). Here is a link to a picture of what I'm
getting:
http://www3.telus.net/public/alexlind/pinky%20monitor.jpg
The column under "Last Post" is supposed to be light gray. It turns
pink right about 70%, then into a bit of purple than white gray. Or is
this within the range of what should be expected? Thanks for the info
Bob!
>
>"George and John" <skull&bones@washington.net> wrote in message
>news:a070p0pge0dmcj809via9ik5hcn7m01uqv@4ax.com...
>> Bob, maybe you could explain this. I have a new Viewsonic VP201s 20"
>> LCD, and I'm pretty happy with it except for one problem. When I
>> change the contrast (I've using DVI-D) gray objects start gray but
>> then go pink as I increase the contrast above 70% . The ideal
>> contrast has light grays are pink (mauve, actually). Other grays are
>> a bit purple. I've had it replaced twice, all the units did the exact
>> same thing, all were manufactured June 2004. I've also tried all the
>> units on a second computer with the same results. Any idea what's
>> going on?
>
>I'll pretty much agree with what "Not Gimpy" said (not
>surprising, he's "in the business" as well), but let me elaborate
>just a bit.
>
>My guess is that this is basically a problem that's been discussed
>here a little before, and it has to do with one of the current
>"Achille's heels" of the LCD. What we'd all LIKE to have is a
>monitor that provides a nice, "CRT like" response curve, or
>"gamma," and sure enough, most LCD monitors DO provide
>some degree of internal correction to make the response of the
>display follow that sort of a curve.
>
>But an LCD does not naturally provide the same response curve
>as a CRT; an LCD's native response is more "S-shaped", and
>has to be externally corrected (especially at the high end of the
>curve) to provide the "CRT-like" sort of response. The vast
>majority of panels made today provide 8 bits of gray scale
>control, per color, at the panel input - and correcting the response
>of the panel effectively "eats into" that dynamic range. If we
>then provide 8-bit-per-color input information, something's got
>to give - the display no longer really has a full 8 bits of response
>across the entire range, along the "corrected" response curve.
>What often results is a color error at some gray levels, which will
>be most visible when trying to display neutral tones (grays through
>white). This can be worked around in the gamma correction
>table, but it takes a bit of doing.
>
>Eventually, we'll start to see 10-bit drivers at the panel level, which
>will let monitors both provide a CRT-like response AND a
>full "8-bit" accuracy across the input range. Those will, of course,
>start to come in at the high end of the market first, as they clearly
>going to start out carrying a cost hit over their 8-bit counterparts.
>
>Bob M.
>
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