1920x1080 HDTV's? (was Re: [mythtv-users] bobdeint as output
mboverload at gmail.com
Fri Dec 31 22:31:42 UTC 2004
Almost every TV you will ever see is a complete rip off. You think it
takes 9 big ones to make a damn TV? Think again. In addition, all
the specs the salesmen give you are complete bullshit, and the specs
on the TV box are bullshit too. Hell, the TV I bought SAID it had a
comb filter, but then I found out it doesn't. I got fricken screwed.
TVs are nothing but lies
On Fri, 31 Dec 2004 14:22:55 -0500, Michael T. Dean
<mtdean at thirdcontact.com> wrote:
> While writing the below response, I started to wonder if there are *any*
> HDTV's available with 1920x1080 pixels. More info below. Keeping it
> short for those who just want to get to the point... :)
> On 12/31/2004 11:55 AM, Kyle Rose wrote:
> >FWIW, I hate interlacing. Interlacing was a technology devised to
> >overcome a limitation of one kind of display technology and should
> >have been deprecated with the advent of DTV. Sorry to open THAT can
> >of worms; just my $0.02. :)
> The limitation: bandwidth.
> If interlacing is no longer relevant in the age of digital TV, that
> implies that we now have unlimited bandwidth. However, looking at ATSC
> high-definition TV, we have two primary modes: 720p (1280x720 at 60frames
> (fr)/sec and 60fields (fi)/sec) and 1080i (1920x1080 at 30fr/sec and
> 60fi/sec). (Yes, I'm ignoring the 30fr/sec with 30fi/sec, and the
> 24fr/sec with 24fi/sec progressive modes available for 1080 and 720
> resolutions--not to mention the 12 other formats with lower resolutions.)
> So, what is the purpose of 1080i? Basically,it allows higher resolution
> at approximately the same bandwidth. 720p gives 921,600 pixels and 1080i
> gives 2,073,600 pixels--more than double the pixels of 720p. However
> both 720p and 1080i take approximately 3MHz bandwidth, compared to 6MHz
> for NTSC (HDTV takes less bandwidth because of the compression that's
> possible with the digital signal). So, if 1080i takes half the
> bandwidth of NTSC, why not make it 1080p at 6MHz? Well, the broadcasters
> feel that the benefits of the progressive format are not worth the cost
> of the bandwidth--i.e. they would rather be able to transmit twice the
> number of channels (=2 times as much space for advertisements) in the
> bandwidth they have available.
> Therefore, 1080i yields a much better picture than 720p for
> "slow-changing" scenes: it is not ideal for sports or other shows that
> are composed primarily of fast-motion scenes. Given that in most
> television shows--dramas, comedies, news, etc.--the fast-motion scenes
> are a very small percentage of the show, 1080i allows much better
> overall picture quality.
> Of course, since nearly all HDTV's on the market have only 1280x720
> pixels, the quality benefit is chiefly available to those people using a
> computer to output to something other than a TV (i.e. high resolution
> monitors (such as WUXGA) or--for those with a lot of extra cash lying
> around--a projector with an extremely high optical resolution that can
> fully resolve 1920x1080, like the Runco DTV-1200 (
> http://www.runco.com/OP_PA_dtv1200.html , MSRP $44,995.00)).
> But, wait! My TV says it supports 1080i. It does. It accepts a 1080i
> signal, deinterlaces it, scales it down to 1280x720 pixels, and displays
> it. Therefore, the TV's available today completely negate the advantage
> of 1080i (better picture quality) by scaling down to 1280x720 (which can
> even produce a lower-quality image than an unscaled 720p image).
> So, are there any real 1920x1080 TV's out there? I figure if I'm buying
> an HDTV, I'm not wasting money on a 1280x720 one, but I can't find any
> 1920x1080 TV's. Toshiba used to have one (
> http://www.tacp.toshiba.com/televisions/product.asp?model=57HLX82 , MSRP
> $8999.99), but now that they've gone exclusively Digital Light
> Processing (DLP) (instead of the Liquid Crystal on Silicon (LCOS) they
> used for the 1920x1080 TV), it seems they only have 1280x720. I'm not
> willing to spend on a projector more than twice what I spent on my car,
> so the Runco is out of the question. Anyone know of any others?
> It looks to me like I may be sticking with SDTV for several more years...
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