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Discussion Starter · #1 ·
While over at projector central I noticed (Dawned would be a better word) than a native XGA (1024x768) DLP (Yamaha DPX-1) is HDTV capable of 720P which I can under stand but also 1035 and 1080i. Now with a maximum of 768 lines does each line represent the odd then even lines of the interlaced scans for each frame? Hence the image would essentially jump up then down one row of pixels every two scans? By this reasoning my SVGA projector at 800x600 could also achieve 1035 and 1080i definition but not 720p?

I seems to have confused my self here and appreciate if someone could straighten me out on it.
 

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HDTV compatible does not mean it can show HDTV. A 12"(30.48cm http://www.avsforum.com/ubb/wink.gif for Australia) B&W TV with a HDTV receiver that has a RF output can be HDTV compatible. In order to be HDTV the signal must be displayed at a minimum of 1280x720. An XGA projector can only display 1024x575 with 1.78 material, which is only about SDTV or EDTV. So all HDTV is down converted and 1.78 DVD is upconverted to 1024x575. All digital projectors are progressive scan.


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William


[This message has been edited by William (edited 10-01-2001).]


[This message has been edited by William (edited 10-01-2001).]
 

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LCD and DLP projectors convert all interlaced signals to progressive before displaying them. The quality of this conversion has a major effect on how the final image looks. That's why a lot of people bypass projectors' internal interlace-to-progressive converters (a.k.a. line doublers, video scalers) by using an external one that works better, such as the DVDO iScan or more expensive Faroudja products.
 

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I'm not an expert but I will try. All signals no mater what the resolution interlaced or progressive go into the projector. The projectors scalar then converts the signal to it's native resolution (1024x768 progressive @1.33 or 1024x575 progressive @1.78). If the input signal is 1920x1080 interlaced it is converted to 1024x575 progressive. Digital projectors display all lines (768 or 575) at the same time with no interlacing. They do not scan out each line the way a CRT does.



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William
 

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Discussion Starter · #6 ·
Thanks William I think I see where I got de-railed there. Though I now realise that I do not know how the interlaced works on DLP/LCD. Is it the same as crt with odd and then even lines being displayed over two fields per frame and the alternate line doing nothing?
 
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