The answer is almost certainly no. Decades ago,while at the Sarnoff
laboratories of RCA, TI had a study of their DLP optics going, one of
several. Because of the small deflection angle of the mirrors, it was very,
very tricky to effectively focus the light from the source on the mirror
array, without losing a lot of the light. RCA's results were not accepted in
the end; I don't know how it is done now in the commercial units.
'Recycling' the dumped light is apt to be very tricky indeed. It is
wasteful, and the lifetime of the HID lamps is limited and its replacement
is expensive -- so there is an appreciable expense in operating a DLP TV.
The intensity of each pixel is controlled by the duty cycle of its mirror,
which has to switch very fast indeed between on and off. Laser illumination
would solve some problems and might be used for DLP theater projection,
which is gaining momentum. Using three DLP arrays might be advantageous
there also, avoiding the use of a color wheel.
Mike Carrell
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?
Hoyt Stearns
Scottsdale, Arizona US
http://HoytStearns.com
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