RE: 3D SPEX (and LCS in general)

[P3D Greg Marshall <greg.marshall@xxxxxxxxxxxxxxx>]

P3D John W Roberts wrote:
<snip>
>Bandwidth of what? I believe the DMD (Digital Light?) displays usually
>use pulse width modulation, and I had assumed that this was controlled
>on-chip - no need to make the processor / graphics controller handle it.
>Are you worried about power consumption of the chip?

You may be right about on-chip control, I don't know.  But wherever
its done, achieving the same performance in stereo means moving
the mirrors twice as fast, which probably is limited by more than
power consumption.  I've heard that they have difficulty in achieving
enough modulation to produce 256 levels per channel at reasonable
frame rates.  That's why the better units use a separate mirror array
for each color channel, to divide the work.

<snip>
>>The likely candidate for future TV displays is fluorescent, which I have
>>to admit I know nothing about.  But I suspect it has similar b/w
>>limitations.

>Is there any difference between a "fluorescent display" and a color
>plasma display? Plasma displays generally use temporal modulation,
>as do traditional passive matrix LCDs.

>John R

Sorry, I meant to say "plasma display".  To use an automotive analogy,
I had my headlight plugged into my taillight socket.

Do you know what kind of switching speed a plasma display exhibits?
As with pulse-width modulation (and I'm not sure how one might dis-
tinguish between PWM and temporal modulation), whatever time is
needed to switch an element gets multiplied by the worst-case number
of switch events needed.

Greg Marshall


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