Ila - JVC 250 Service Manual

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4.3 ILA

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ILA

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