The 540p upconversion thing on Hitachi and Toshiba TVs is more a problem than a good thing. See www.keohi.com/keohihdtv for the explanations.
On the standalone DVD player side, what Toshiba is advertising is kind of marketing BS to stir up confusion. I'm sure someone else can explain it better than I can. http://www.hometheaterspot.com/htsth...b=5&o=&fpart=1
I just know to ignore that line of spec on DVD players until someone more knowledgeable says otherwise.
Make sure not to confuse horizontal and vertical resolution when reading specs on tvs and dvds. Toshiba's DVD players' specs are stating horizontal resolution - as measured as a function of picture height. i.e. how many "pixels of information" are outputted on one length of a horizontal line equal to the picture height. The 540p figure for some Hitachi and Toshiba tvs is the number of horizontal lines in total on the entire image - i.e. vertical resolution. These tvs take the NTSC standard of 480 (actually 525 but the rest are not used for the video image) and upconvert it to 540 for the reasons already stated. It can be confusing since both values are the same. If one takes the 540 lines of horizontal resolution and does (540 * 4) / 3, one gets 720 which then gets you the DVD standard resolution of 720 * 480. So really all Toshiba is stating on their dvd players' specs is that they conform to the DVD spec.
Whether or not you actually see this amount of horizontal resolution on your tv (all tvs support 480 lines of vertical resolution) depends on what it's horizontal resolution capabilities are. The best way to determine this is to use Avia test patterns to measure it. In addition, the actual dvd content stored on the disc may not be stored with a full 720 * 480 pixels of information.
When the TV takes in 480p and displays 540p, two things have to happen.
(1) For every six incoming scan lines, a seventh must be synthesized and added. It is difficult to do this without causing more jaggies. Rather than just repeating every sixth line, some systems do an elaborate blending which reduces jaggies but can still result in repeating thin horizontal banding as seen in the Keoki HDTV site examples.
(2) The incoming video has to be digitized in order for the 480 to 540 scaling process to occur. If there is an insufficient pixel width (chopped into not enough pixels per scan line) there will be softening and some moire patterns amidst closely spaced fine details.
A DVD player that outputs 540p or 1080i also has to deal with problem #1 above.
Video hints: http://members.aol.com/ajaynejr/video.htm