Re: which monitor has high resolution?
- From: "Not Gimpy Anymore" <nogimpREMOV@xxxxxxx>
- Date: Fri, 30 Nov 2007 19:43:59 GMT
"rjn" <email4rjn@xxxxxxxxx> wrote in message
news:9bef10e4-f331-4738-9ad3-5d2ae3ab79b2@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
"Bob Myers" <nospample...@xxxxxxxxxxxxxxx> wrote:
Well, actually going much below 60 doesn't really
work all that well on most LCDs.
The popular [mis]conception among those who have
thought about it, but not read your book :-), is that LCD
panels are a form of write-only frame buffer. You send
a data set to a pixel triad, and it stays at that value
until you send another data set, whenever.
Flicker as we knew it in CRTs isn't an issue, but there
ARE some timing concerns within the LCD that cause
most manufacturers to limit the native rates of the modules
themselves. On just about any LCD monitor in production
today, if the input frame rate is off from 60 Hz by more
than a few Hz, there's a frame-rate conversion being done.
Is there usually/sometimes/never a real frame buffer
in that path? If present, it "should" completely decouple
what the panel needs from what the host wants to send.
Short answer is "hardly ever"... Only added if it is considered
necessary to the business to support different frame rates
(like content intended for film, at 24 Hz multiples). Us
"integrators" tend to follow instructions given by our (direct)
customers (solutions providers), and allow the solutions providers
to deal with the end user issues.... Not very pretty, but not much
choice either.
RAM is relatively cheap, but the monitor makers can save
a few cents by making (and enforcing) some assumptions
about the signal envelope, I suppose they do.
Absolutely they do skimp - if you think PC margins are slim,
the margins on peripherals are smaller ... pennies make a
difference.
I often say that the panel makers are the only ones making
any profit at all, and even that is largely supposition, since they
do so well at keeping their financials disguised. The only concrete
clue is that they are still in business.......
As to the "enforcing", again it's really the panel companies
who do that, when it comes to how we will drive their panels...
Oh, sure, they try to be "open" by participating in standards
activities, but in the end, they rule.
Which makes it less likely than ever that avoiding dual-link
will be accomplished by using low host frame rates.
The other work-around gimmick that is even less likely is
data reduction (e.g. sending only changed pixels).
Well, as usual, in a "closed system" anything is possible,
but in open systems like PC's, we are always faced with
standards (either established, or defacto) that tend to limit
our flexibility. Even having said that, many closed systems
today still balk at the idea of adding expense if it only seems
to benefit relatively few....
But then I'm "preaching to the choir" aren't I?
--
Regards, Bob Niland mailto:name@xxxxxxxxxxx
http://www.access-one.com/rjn email4rjn AT yahoo DOT com
NOT speaking for any employer, client or Internet Service Provider.
NGA
.
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