[PhilB]

The Sept issue of Spectrum has an article on page 73 about the new Philips LCoS display. Interestingly, this thing uses 1 panel with three spinning prisms to change the color on the panel. It sounds like this generates an image similar to the SCR wheel that's coming for DLP.


-phil

 

[Ross Cutler]

This design also should have rainbow artifacts, unless the prism is spinnng REALLY fast (see http://www.avsforum.com/ubb/Forum10/HTML/008297.html for my calculations of the minimum color wheel speed to eliminate rainbows).


Ross.

 

[PhilB]

The article mentions that this was done to simplify the light path and eliminate the need to combine and allign three seperate colors.


Of course that could all just be marketing hype to justify a potentail loss in performance do to a cost reduction.


-phil

 

[David Mathews]

Sorry, can't find the link. But I think Philips research claims they went for single panel for both cost and convergence reasons. To solve rainbow, I think they had a way to switch pixels faster so the eye wouldn't see it. I think final refresh was 100+ Hz, thats why I wanted to find link for you. Sorry..



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Dave

 

[David Mathews]

Oops, heres the link...
http://www.research.philips.com/pass...w4/pw4_16.html


ends up being 150-180Hz !


some verbage on why they chose single vs 3 panel... They also say prism is more efficient than color wheel. Which makes sense if light from lamp is spilt into three beam simutaneously, not so much if rotating prism does it sequentialy... ?


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Dave

 

[ldaboll]

Phil, doesn't this seem to be going the wrong direction by adding complexity and moving parts into the equation? Seems to me a three chip with single prism (RCA LCOS) would be more reliable over the long run. Do you think the price reduction on one chip versus three will offset the realiabilty issue? Thanks for the heads up on the article by the way.


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Lou Daboll

 

[ldaboll]

Thanks for the link. http://www.avsforum.com/ubb/smile.gif



Philips own words tell why they chose this method:


"The high-quality image, together with the advantage of low cost, presents an attractive option for low-cost consumer HDTV displays, high-resolution workstation monitors and business presentation displays."

low-cost consumer HDTV displays appears more important than high quality and reliability.


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Lou Daboll


[This message has been edited by ldaboll (edited 09-08-2001).]


[This message has been edited by ldaboll (edited 09-08-2001).]