The physical properties of the LCoS microdevice, like the absence of a color wheel and the high fill factor, generally provide a high-quality picture with a minimum of artifacts. LCoS pixels are also smoother than the pixels of other systems, which some people say creates more natural pictures. The rainbow and screen door effects common to DLP televisions don't exist for LCoS. Unlike LCD systems, they're not prone to screen burn-in.
However, most LCoS systems don't have a very good black level, or ability to produce the color black. Televisions with poor black level generally can't produce as much contrast or detail as those with good black level. Since LCoS televisions and projectors use three microdevices instead of one, they also tend to be heavy and bulky. Most require periodic lamp replacement, which can cost several hundred dollars.
In addition, LCoS systems aren't as common as other display types. The reason for this is that LCoS microdevices are difficult to manufacture, and each set needs three of them. Several companies, including Intel, have tried to produce LCoS systems and have abandoned their efforts after consistently low yields in manufacturing.
Check out the links below for lots more information on liquid crystals, televisions and related topics.
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More Great Links
- Carnoy, David. "LCoS HDTV's Bumpy Ride into the Living Room." CNET, October 15, 2004. http://reviews.cnet.com/4520-8900_7-5540515-1.html
- Cuypers, D., et al. "Assembly of an XGA 0.9" LCoS Display using Inorganic Alignment Layers." ELIS Dept., Kent University, 2002. http://www.elis.ugent.be/ELISgroups/tfcg/publi/eurodisplay2002_p-45.pdf
- DeBoer, Clint. "Display Technologies Guide." Audioholics, February 9, 2004. http://www.audioholics.com/techtips/specsformats/displays_LCD_DLP_plasma1.html
- "Device Future." JVC-Victor, 2004. http://www.jvc-victor.co.jp/english/pro/dila/device.html
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- SpaciaLight http://www.spatialight.com/
- US Patent & Trademark Office, Patents 5,283,676: Liquid Crystal Light Valve. http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=1&u=/netahtml/ search-bool.html&r=1&f=G&l=50&co1=AND&d=ptxt&s1=5,283,676.WKU.&OS=PN/5,283,676&RS= PN/5,283,676
- Van Dorselaer, G., et al. "XGA VAN-LCoS Projector." ELIS Dept., Kent University, Belgium, 2002. http://www.elis.ugent.be/ELISgroups/tfcg/publi/eurodisplay2002_s11-3.pdf.
- Wilkinson, Tim. "Liquid Crystal over Silicon Microdisplays (Construction)." Photonics and Sensors Group, Cambridge University. http://www-g.eng.cam.ac.uk/photonics/microd/indexp4.htm