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
Summary of Contents for 200
Page 1: ...SERVICE MANUAL Model 200 Projector ...
Page 10: ...Safety Information Model 200 Service Manual x ...
Page 14: ...Chapter 1 Introduction 1 4 Model 200 Service Manual ...
Page 79: ...Chapter 2 System Description Model 200 Service Manual 2 65 ...
Page 121: ...Chapter 4 Maintenance Removal Replacement 4 24 Model 200 Service Manual ...
Page 131: ...Chapter 5 Troubleshooting 5 10 Model 200 Service Manual ...