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In Reply to: RE: What happened to 1080i? posted by gymwear5@hotmail.com on April 25, 2008 at 10:37:36
Don't show interlaced imaged, they have to deinterlace it to progressive.
CRTs do interlaced, but Plasma, LCD etc are fixed pixels and can only show progressive ie 720p or 1080p.
Jack
Follow Ups:
Yes, I understand that there are only so many right to left pixels and the refresh rate for a panel can be 24, 30 or 60 Hz. But a year ago, there were panel displays rated as 1080i. Im' just curious what it was that changed. Was/is a 1080i spec'd panel a 30Hz 1080p screen and a 1080p a 60Hz capable 1080 resolution panel?
("panels" means "flat" in the display business) were select models from Hitachi and Fujitsu because they were based on the two companies' Alis and eAlis technologies. These panels were in fact interlaced plasma displays.
The only other 1080i displays are CRT, which can be found in rear projection, front projection and direct view models.
If a display is an actual/true 1080i display, then it cannot be a 1080p30 display. The reference to 1080p in display presentation can only be a progressive display -- interlaced displays cannot present 1080p by definition. That doesn't mean a 1080i display cannot accept a progressive signal (such as 720p or 1080p) and perform processing to present the progressive signal as an interlaced signal (its native mode).
Are you sure you're not confusing display type with the type of signal that a display can accept?
By the way, 1080p signals from satellite and cable (though slower to adopt) are not far off. Several companies are issuing converters that incorporate video decoders (mostly AVC/H.264) which will accept 1080p signals. For backward compatibility, these converters will be able to output a signal that's older-model-display friendly.
simply the ability of the panel to accept an incoming 1080p signal. The panel itself always showed a progressive signal—1080i panels displayed everything at 1080p. Their input circuits simply wouldn't accept a 1080p signal, probably a bandwidth restriction. What changed was the input stages.
As others have stated in this thread, plasma and LCD panels always display a progressive image.
David Aiken
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HDTV broadcasts are often 1080i and many HD displays are 1080i, too.
-------------Call it, friendo.
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...and will be for a long, long, long, long time, I don't see how you can claim that it's "fading."
But, I've seen stranger claims posted here. :-)
I know a lot of broadcasting is 1080i.. My local PBS got 1080i capability
and bragged about it endlessly.I imagine it will be a while before they upgrade again. But after this year you will see a slow drift towards all digital. I don't think companies are in any sort of rush, but if you were buying gear now, you wouldn't be buying analog.
It's not simply a matter of the station upgrading and the consumer upgrading. There is a reason no one is broadcasting 1080p over the air--it's not practical. Even 1080i and 720p are tough to broadcast without resulting in compression artifacts.
But again, as we've been trying to tell you, interlacing is not an analog technology. It's a way to trick the eye into thinking it's seeing solid frames without having to broadcast solid frames--which reduces the bandwidth required. That's why it was important for analog sets that didn't have the processing power of new HDTV sets, but you're wrong in thinking interlacing is an analog technology per se.
-------------Call it, friendo.
You need to do some research. 1080i is not an analog standard. I don't think most of us will be around to see 1080p broadcasts as the standard.
> > I imagine it will be a while before they upgrade again. < <
Indeed. It's a pretty safe bet to say that broadcast resolution won't go beyond 1080i in your lifetime.
a
Fer real. This may be where I draw the AV line :-)
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