Re: Why do not CRT/LCD monitors come with USB?

On Wed, 16 Jul 2008 03:32:38 +0200 (CEST) david <none@xxxxxxxxxx> wrote:
| On Wed, 16 Jul 2008 01:17:57 +0000, Rahul rearranged some electrons to
| say:
|
|> 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....
|
| Example for a medium resolution:
|
| 1024 x 768 pixels x 24 bits per pixel x 30 frames per second
| = 566 Mbits/sec.
|
| USB 2.0 high speed = 480 Mbits/sec

That's for the old model of retransmitting every bit over and over and over
faster than you can see it change.

USB (or Firewire or ethernet) might well be practical if the video model is
changed to where the monitor acts like a VNC client and the traffic across
the wire represents only what is updated most of the time (and occaisionally
a full refresh can be made in case of lost pixels).

That might not do so well for those HD 1920 x 1080 at 60 Hz progressive TV
sports programs. But it would be fine for 99% of office desktop uses and
99% of non-video home computer uses.

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