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Question about 1080i DLP
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Spike
Good Chocobo


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Old Dec 31, 2006, 04:29 AM Local time: Dec 31, 2006, 02:29 AM #1 of 6
Question about 1080i DLP

We recently bought a 73 inch DLP HDTV for our house and I started to research the specifics on the difference between interlaced and progressive signals. I came across this article: http://www.engadgethd.com/2006/07/24...080i-and-1080/ that says:

Quote:
LCDs, DLPs, SXRD/DILA/LCoS, and plasmas are always a progressive type TV. Only CRTs can properly display an interlaced signal. The other type of displays will take that incoming interlaced signal and display it in a progressive type resolution like 720p or 1080p.
My question is, since our set is DLP and the article says DLP sets always are progressive TVs, why does our DLP set list 1080i as one of the options for signals? Does that mean it receives 1080i signals and upconverts to 1080p? If so, what's the use of listing 1080i as a capability of the TV when all non-CRT HDTVs display in progressive?

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Pyocola
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Old Dec 31, 2006, 07:23 AM Local time: Dec 31, 2006, 01:23 PM #2 of 6
Yes, these TVs take the interlaced signal, deinterlace it to progressive and scale it to whatever resolution the set has. Even if the set can't actually display 1080i natively, it's listed as a capability for signal input, because you need to know what kind of signals you can send to the TV. For example if a set only lists 1080i as a supported input signal, you can not send a 1080p one and expect it to work, even if the panel itself might be 1080p.

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Spike
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Old Dec 31, 2006, 04:44 PM Local time: Dec 31, 2006, 02:44 PM #3 of 6
Ah okay, so the listed resolutions are the signal input capabilities. I always thought they were what resolutions the TV could display. Thanks.

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Metal Sphere
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Old Dec 31, 2006, 05:20 PM #4 of 6
Ah okay, so the listed resolutions are the signal input capabilities. I always thought they were what resolutions the TV could display. Thanks.
Actually, that's exactly what they are. From there simply read Pycola's explanation and you've got the whole thing figured out. Basically, the set takes the supported signals and scales them to the native resolution of the screen.

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Spike
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Old Dec 31, 2006, 05:25 PM Local time: Dec 31, 2006, 03:25 PM #5 of 6
I guess I should've explained it better. When I said "I always thought they were what resolutions the TV could display" I thought a TV listing 1080i meant it displays it in 1080i instead of being able to take 1080i and displaying it in its native resolution. Sorry for the confusion, but thanks for clearing it up, Metal Sphere.

I was speaking idiomatically.
Metal Sphere
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Old Dec 31, 2006, 05:40 PM #6 of 6
I guess I should've explained it better. When I said "I always thought they were what resolutions the TV could display" I thought a TV listing 1080i meant it displays it in 1080i instead of being able to take 1080i and displaying it in its native resolution. Sorry for the confusion, but thanks for clearing it up, Metal Sphere.
Ah, don't worry. I found that a lot of people make a similar mistake when they see the supported resolutions on a display that is advertised as being a 720p/1080p.

How ya doing, buddy?

The text is part of the image and the two squires aren't exactly even.
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