JVC 250 service manual Ila, ILA Main functions, ILA Inputs, ILA Outputs

Chapter 4---Optical

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 4-9ILA® structure

Model 250 Service Manual 4-13