JVC 250 User Manual

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

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