14
Antares-PJ1Training
Slide 14
Optical Components
The DMD chip is the central part of this type of projector.
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 red sector, a green sector, and a blue sector.
This light is reflected off the chip and out through a lens onto a screen.
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 red segment, a green segment, and a 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.
