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Colour Filtering

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Finally - A Silent, Solid State alternative to mechanical, noisy colour wheels.

In a single chip microdisplay projection engine, the white light from the lamp must be separated into sequential red, green and blue wavelengths in order to create a full colour image from the microdisplay. This is ordinarily achieved using a mechanical rotating colour wheel.

Colour wheels are noisy, mechanical rotating filters used to separate white light into red, green and blue wavelengths.
This approach is used in many of the ultra portable projectors dominating the market today. The mechanical colour wheel however is noisy and requires complex (expensive) synchronization with the display drivers to achieve reliable results. It is also bulky consuming valuable space. It would be inconceivable to put a colour wheel in a small microdisplay product for instance.

 

The ASIL Advantage
DigiLens technology provides a solid state alternative to the mechanical colour wheel having red, green and blue diffractive layers which can be electronically switched on and off with simple synchronization.  

As the different layers of the ASIL are activated in turn, the red, green and blue light is focused onto the display chip.

By rapidly switching between the layers, in synchronization with the

DigiLens ASIL solutions provide a solid state, silent alternative to colour wheels allowing single chip systems to be used in desktop rear projection monitors or TVs where silent, continuous trouble free operation is critical. 
  
display chip, the red green and blue illumination allows the microdisplay to generate a high definition full colour image - just like today's colour wheel based microdisplay based projectors, but without the annoying noise. DigiLens has working demonstrations of this technology and is developing several components for some for the world's leading projection display manufacturers. If you value quiet, especially in rear projection microdisplay based monitors, read on! DigiLens is committed to the future of low cost projection displays.
 
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Page last modified: November 26, 2002