There is a misunderstanding of the nature of DLP technology. The active
element is an array of tiny mirrors created by silicon machining techniques,
one for each pixel. Each mirror can be tilted by a small angle under control
from a TV signal. That tilt determines wihether the light falling on it goes
to a location on the screen or to a dump. The average intensityof each pixel
is determined by the fraction of time the mirror illuminates the screen. The
individual mirrors do not scan, they only switch light to or away from one
location on the screen. The optics, once fixed, are quite robust. The only
variable is the lamp. which has finite life and must be changed.
Mike Carrell
-------------------
In reply to Hoyt A. Stearns Jr.'s message of Sat, 6 Jan 2007
17:41:40 -0700:
Hi,
[snip]
In a digital light processing (DLP) display, a light source (soon to be a
tri color laser) projects on an array of movable mirrors. The light for
the
dark parts of the image are sent to a beam dump. That seems wasteful. Is
it possible to collect that light and re-introduce it into the primary
source?
Instead of using the mirrors to direct the beam to a beam dump, simply
turn the
laser off for a fraction of a second. This will require a change in the
logic
and electronics, but is much more efficient (instead of recovering the
energy,
it is simply not used in the first place). It also means that the mirrors
can
continue to scan the line, maintaining momentum. Then the mirrors need not
be as
easy to maneuver, which is technically simpler and cheaper to implement,
as well
as resulting in a more robust design that produces a better quality image.
Regards,
Robin van Spaandonk
http://users.bigpond.net.au/rvanspaa/
Competition provides the motivation,
Cooperation provides the means.
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