Ricoh KW5708, Service Training

Page: 40 / 61

Slide 40
DLP Projectors (2)

R, G, and B signals from the image generating device are sent to
the DLP chip, and timed so that the red signal arrives at the same
time that the red part of the wheel is in the beam path, and
similarly for the green and blue signals.

The DLP chip generates the R, G, and B images by re-positioning
the micromirrors using micromachined hinges to make different
pixelated images for each colour (meaning that each micromirror
has an ON and an OFF position).

The mirrors can switch over every 15 microseconds, so moving
images can be projected.

For SVGA resolution, the mirrors are 16-micrometer squares, with
a gap of about 0.8 micrometers between each mirror. Below, we
can see the size of the mirrors compared to a grain of table salt.