28 replies and nobody else has called anyone else an idiot. It's time to fix that. You're idiots--mostly.
There is a difference between HD and SD. If you can't see it, you're not receiving HD programming. Cable boxes (or satellite, or DVD, or whatever) must be broadcasting at HD resolutions. That means HD-specific channels (like National Geographic HD, or History HD). They broadcast in 1080i usually, some might be in 720p, which is still HD, which is still better than SD.
Regular DVD players can broadcast at a maximum of 480p (considered enhanced def or ED). This is often promoted as "progressive scan" DVD players. (that 'p' stands for progressive, while 'i' is for interlaced). So, a 480p DVD will look blurry still on a 1080p television, if the television scales it at all. Otherwise, it'll just be a box on your screen.
As for Upscaling DVD players, they wash the signal and up-scale regular DVD's to "near-HD" resolution. Basically it's the HD without the HD. It sharpens and enlarges the picture, but you don't have the same levels of clarity or detail that you get with True HD movies.
As for 1080p HD, the real show, it takes more than just an s-video cable. If you want to see a great picture, go HDMI. Buy the cables cheap from any number of online retailers; RCA cables just don't cut it.
Most computer montiors that support 1920x1080 (or 1200 for 5:4) are 24" and above, but I'm sure you can find some 22".
As for VGA, DVI, HDMI, it all depends on the DRM now. VGA can and will support full 1080p, but it's broadcasting over analog signals and is subject to interference, unlike DVI and HDMI. Only DVI and HDMI (Digital cables) will support HDCP, the bullshit copy-protection Blu-Ray and HD-DVD use to prevent illegal piracy--except as usual, DRM screws over the consumer who has to figure out why there monitor and computer won't play their movies. More on that another day.
As for resolutions, the 22" monitor and the 40" TV are broadcasting at the same resolution. However, you are seeing a higher pixel density on the monitor than the TV. So, in theory, you will actually see a better picture on the computer monitor than on the TV. However, people sit 1' away from their computers, and 9' from their TV's, so the TV picture still looks pretty damned good.
Any other questions?
ADDENDUM: Oh yeah, I forgot to mention cable providers (and satellite) like to complain about their "limited" bandwidth here in the States. Bullshit, but whatever. They just don't want to invest in expanding their network backbones. The result of this? They use lossy compression to send streaming video (aka, your nightly cables news in HD) so the signal already is kinda shitty when it reaches your box.