Re: Why do not CRT/LCD monitors come with USB?
- From: "M.I.5¾" <no.one@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 16 Jul 2008 08:26:31 +0100
"Rahul" <nospam@xxxxxxxxxxxxxx> wrote in message
news:Xns9ADCCE2A53BF66650A1FC0D7811DDBC81@xxxxxxxxxxxxxxxx
These days, every possible accessory seems to be "bluetooth" / USB
interfaced. But I've never seen a "USB" monitor advertised. (neither
bluetooth, of course) Neither CRT (who buys those!? :) ) nor LCD.
Why is that? A bandwidth limitation? Or a need that doesn't exist? I doubt
that is the reason since if I can want a USB headset why not a USB
monitor?
Besides there are "good" quality headsets available even on bluetooth. Is
"acceptable-quality" sound transmission fundamentally a lower bandwidth
process than "acceptable-quality" images? What is the ratio of the max
bandwidth attainable over USB vs bluetooth vs "traditional-monitor-
connections".
I cannot think of any other peripheral that isn't available in a USB
version if not bluetooth. Do others have examples of they know? Just
curious....
It is perfect feasible to run a computer display via the USB interface (and
there are examples of this in practice). However, having said that, the USB
interface is far from an ideal choice for the job. The biggest limitations
are the limited bandwidth and that the host USB port (the one on the PC)
requires a considerable amount of CPU support when transmitting and
receiving data. Since this will be happening more or less continuously, the
CPU will have difficulty finding enough time for all the other activities
that it has to support. In general, it is most desireable to take as much
of the graphic functions away from the main CPU as possible. This is why
PCs have a dedicated Graphics Processor with its own dedicated interface
with the monitor. Then the CP can get on with doing what it does best.
.
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