I don't understand HDTV...

[rbV5]

Originally posted by: Continuity28
Alright I give up.. everyone splits hairs with me... Not only am I a failure IRL but I'm one online too...

Anyways, I'm not helping this thread, I'm probably adding to the confusion.

Can a mod delete my posts for me?

Cmon now, you make some very good points

 

[Josh7289]

What about HD CRTs, do they have to interpolate? Are there any flat panels with real 1280 x 720 or 1920 x 1080 resolutions? Thanks.

 

[EightySix Four]

WTH is with all the mods... please delete posts?

 

[Josh7289]

He said he made things more confusing, so he wants his posts deleted...

 

[rbV5]

Originally posted by: Josh7289
He said he made things more confusing, so he wants his posts deleted...

That was unecissary, his posts added some good information.

What about HD CRTs, do they have to interpolate? Are there any flat panels with real 1280 x 720 or 1920 x 1080 resolutions? Thanks.

It depends on the CRT (CRT's include direct view displays (like your old TV or PC monitor), Projectors and RPTV's) most CRT's except for the very best components cannot fully resolve HDTV. They are constrained by video bandwidth (36MHz for 1080i, 72 MHz for 1080p vs ~ 3 to 6 MHz for 480i broadcast and 12 to 15 MHz for 480p DVD's) and Dot or Rib pitch.

I know for instance that my RPTV set cannot fully resolve true 1080i since it only has 7" guns. The maximum resolution that any CRT can fully resolve is determined by the point at which the scan lines meet each other. After that point, the scan lines begin to mix and the picture begins to soften. (9" guns are required to display 1080i)

The dot pitch on direct view CRTs will determine if it can resolve HDTV, a 32" Direct View CRT with a standard .8mm dot pitch would only be able to resolve 1200 pixels horizontal resolution.

Are there any flat panels with real 1280 x 720 or 1920 x 1080 resolutions?

Yes, depending on the technology and how much money you have, you can get panels that can fully resolve up to 1080p.

DLP, I believe the HD2 chip can resolve 720p and xHD3 can resolve 1080p.
LCD, I think at least Sharp and Samsung have 1080 resolution sets
LCOS / D-ILA have even higher resolution panels
Plasma, I was just looking at a 71" LG Electronics display, 1080p @ ~ $30,000.00

 

[Fox5]

Originally posted by: rbV5

CRTs have the same problem in the end. The electron beam can't do both progressive and interlaced material natively.

My 22" CRT certainly can (its something you can test for yourself), interlaced resolutions aren't pretty, but they are supported with my Radeon card...how do explain that?

The CRT doesn't natively support anything interlaced, it's the drivers of the Radeon that can buffer the image.

 

[nRollo]

Originally posted by: Continuity28
Anyways, I'm not helping this thread, I'm probably adding to the confusion.

Can a mod delete my posts for me?

LOL

 

[BFG10K]

WTH is with all the mods... please delete posts?

LOL, somebody having a bad day with the "reply" button.

 

[SonicIce]

Originally posted by: Continuity28
Mods... please delete.

nef?

 

[rbV5]

Originally posted by: Fox5

Originally posted by: rbV5

CRTs have the same problem in the end. The electron beam can't do both progressive and interlaced material natively.

My 22" CRT certainly can (its something you can test for yourself), interlaced resolutions aren't pretty, but they are supported with my Radeon card...how do explain that?

The CRT doesn't natively support anything interlaced, it's the drivers of the Radeon that can buffer the image.

Checking the specs on a newer model(mine is likely a bit lower, but similar) It states specs 30 kHz to 140 kHz for hrizontal scan rates and vertical refresh 50 Hz to 160 Hz. I don't think any CRT cares whether the signal is interlaced or progressive, it just displays an image (auto sync's) if it supports the horizontal scan rate at a supported refresh rate. The radeon card itself with Catalyst Drivers does have interlaced output support. I could be just misunderstanding it, or mis-stating it slightly as far as how a CRT monitor displays the interlaced signal itself, but my understanding is that each field is displayed at the vertical refresh of 60Hz to produce the 30 FPS framerate of 1080i (1080p has a framerate of 30FPs and 24FPS not 60FPS btw, 720p can be 24,30 or 60 FPS)

The signal my CRT monitor receives for 1920x1080@30Hz interlaced and 1920x1080@60Hz driver settings are definately different (and definately display much differently),
Using my CRT monitor's OSD Diagnosis utility (horizontal scan rate/refresh rate)
1920x1080@30Hz interlaced reports as 33 kHz @ 59Hz (not pretty)
1920x1080@60Hz reports as 67kHz @ 59Hz (flicker, but due to the refresh rate)
1280x720@60Hz reports as 44kHz@ 59Hz (as above)

At 60Hz vertical refresh, my understanding is:
480p and 960i is 31.5 Khz horizontal scanrate
540p and 1080i is 33.75 Khz horizontal scanrate
720p and 1440i is 45 Khz horizontal scanrate

So, I'm not really certain that it is truely interlaced (I'm just a PC enthusiast, and many of the finer details concerning video continue to confuse me), but I'm just guessing that my RPTV supports a much narrower horizontal scanrate at 60Hz than my CRT (31.5 and 33.75 for 480p and 1080i, the resolutions it supports natively) I really doubt it supports to 67kHz, and the reported scanrate from my monitor corresponds to the known 1080i specs.