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Chapter 2---System Description
High intensity light from a Xenon Arc Lamp is applied, through a
prism (where it is polarized), to the output side of the ILA
®
assembly where the liquid crystal layer is located. The polarized
light passing through the liquid crystal is modulated (changing the
polarity of the light waves), in accordance with whatever image is
on the input side of the ILA
®
assembly.
The axis of the polarized light is proportional to the brightness on
the input side of the ILA
®
assembly. When the photoconductor on
the input side is not illuminated, the liquid crystal does not rotate
the polarized light from the Arc Lamp. No light passes through the
prism and the screen is dark. When the input side is fully
illuminated, the liquid crystal rotates the polarized light 90° from a
horizontal direction to a vertical direction. Ninety nine percent
(99%) of the light entering the ILA
®
assembly is reflected and
passes through the prism resulting in a white screen.
The modulated high-intensity light is reflected back out of the
output side of the ILA
®
assembly, through the Prism and the
Projection Lens and onto the screen. (see Figure 2-19).
Figure 2-19. Simplified image/optical path.
2-64 Model 200 Service Manual