LCD v DLP projectorsWritten by Kenny Hemphill
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Digital Light Processing (DLP) is a technology developed by Texas Instruments and it works by projecting light from projector’s lamp onto a DLP chip, made up of thousands of tiny mirrors. Each mirror represents a single pixel and directs light projected onto it either into lens path to turn pixel on or away from it to turn it off. Most DLP projectors have only one chip, so in order to reproduce color, a color wheel consisting of red, green, blue and sometimes, white filters is used. The wheel spins between lamp and chip and changes color of light hitting chip from red, to green, blue. Each mirror on DLP chip tilts towards or away from lens path depending on how much of a particular colour light is required for that pixel at any given instant.
The key advantages DLP has in LCD v DLP debate is that DLP projectors tend to be smaller and lighter, have better contrast, and don’t suffer same pixelation problems as LCD projectors. There is one problem that some users report with DLP projectors, although it appears to only affect a very small number of people. Because of way DLP works, at any given instant, image on screen is either red, green, or blue. However, images change so quickly, that human eye doesn’t detect this and your brain puts red, green and blue images together to make a complete frame of video. Unfortunately, some people can see individual colours, and others can detect them enough to cause eye-strain and headaches. However, technology has improved significantly with introduction of six-color wheels and faster rotation speeds. The rainbow effect should be a problem for even fewer people. The best way to find out if you’re affected is to try out a DLP projector, perhaps by hiring one, before you buy.
Technology in both LCD and DLP projectors is improving all time. However, at time of writing DLP still has a slight edge in home theater market.
Kenny Hemphill is the editor and publisher of The HDTV Tuner
Virtual Wrapping Paper and E-Gifts- Is there really an online Santa?Written by Nimby Simons
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The buyer has their choice of virtual ribbon and wrapping paper which is used to wrap a 3D gift box. After easy job of personalizing their gift-box and card, user simply fills in recipient’s email details includes a brief message and present is on its way. The child gets an email, addressed from sender’s email address, containing a gift-link. Once this is clicked on child is taken to a special site where they are presented with their card and gift-box. After opening and reading card, child is then offered option of “opening” their e-gift. This causes harps to strum, ribbon to gracefully slide off box, lid to swing back and balloons to fly out of box. Springing out of box then is 3D graphical representation of Kite Capers CD-ROM package. The child is asked if they’d like to download their present, if they do, package is then downloaded quickly onto their hard-drive and away they go. The process seems as fun to gift-giver as to lucky child and provides a wonderful option for those with young relatives they’ll be unable to visit on their birthdays or this Christmas. And much less mess for rest us to clean up. So have a look at Virtual Wrapping Paper and E-Gifts at www.ustargames.com process is free and very easy to trial and you might find yourself sending your first present through internet.