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Chapter 4---Optical
Model 250 Service Manual 4-13
4.3 ILA
®
ILA
®
Main functions
!
Modulates image light from the CRT onto the high intensity polarized
light from the Arc Lamp
!
Reflects high intensity light received from the Prism Assembly back into
the Prism Assembly after modulating with image light
!
Adjustable bias voltage and frequency (ILA
®
Sensitivity)
!
Adjustable offstate with Super Contrast ILA
®
s
!
Image light from CRT is blocked from output. Image is electrostatically
coupled to output
ILA
®
Inputs
Arc Lamp light - High intensity polarized Red, Green or Blue light from the
Prism Assembly.
Image light - Red, Green, or Blue image light from the CRTs.
ILA
®
Bias Voltage and Frequency - 10-13 Vac at 2 kHz
ILA
®
Outputs
Image light - High intensity polarized image light output to the Prism Assembly
and then to the Projection Lens and screen.
Figure 4-9
ILA
®
structure