25
Soleil-PJ1Training
Slide 25
Optical Components: DLP Projectors
The DMD chip is the central part of this type of projector.
In this model, it is called the DLP chip, not the DMD chip.
A DMD chip consists of many small pixel-sized mirrors laid out on a semi-
conductor chip. Light shone on the DMD chip is reflected by all these tiny
mirrors. (For a chip with 1024 x 768 resolution, there are 786,432 small
mirrors.)
Light is shone onto the chip through a fast-spinning color wheel (CW in
the diagram) that has a has cyan, yellow, and white sectors in addition to
the usual red, green, and blue sector.
This light is reflected off the chip and out through a lens onto a screen.
This is a general description. The Soleil-PJ2 does not look exactly like this. See
later in this presentation for the components of the Soleil-PJ2.
Lamp: Light source
UV-IR Filter: Lets visible light through (wavelengths between 380~780nm) and
prevents UV and IR damage to other optical parts.
CW (Color wheel): The wheel has a cyan, yellow, and white segment in addition
to the usual red, green, and blue segment. The wheel rotates to provide red,
green, and blue light (the color of the output beam changes from red, to green to
blue)
Integrating Rod: Gives the light a uniform luminous flux.
L3: Condensing lens. Condenses divergent light.
L2: Condensing lens. Works with L3 to condense divergent light.
M1: Mirror 1. Changes the light direction.
M2: Mirror 2. Changes the light direction.
Relay L1: Condenses and magnifies divergent light before it goes to the DMD.
DMD Chip: Contains micro mirrors to generate the image
Projection Lens (WT41 in the diagram): Projects the image onto the screen.
