Well if you are going to be an ass about it perhaps you should check your facts too.
NTSC - resolution 648 x 486
D-1 NTSC - resolution 720x486
D-1 NTSC Square Pix - resolution 720x540
Ok Allow me to explain, I have no Idea where you are getting these numbers. NTSC is 720x480, also known commonly as 480i or 480p. i stands for interlaced and is therefore split into two 240 fields horizontally, whereas p stands for progressive and is one full and uninterlaced field. A far better and superior image for digital displays.
Go pick up the manual that came with your cheap sanyo LCD and read about the display resolutions that it will support. Or you can go here:
http://www.sonyhdvinfo.com/article.php? ... Definition
But if you are too lazy to actually figure it out on your own I've already gone ahead and picked out the important stuff.
Remember what we are talking about here is DIGITAL VIDEO, or DV.
DV NTSC then is represented by a grid of 720x480 pixels at 29.97 frames per second for NTSC and 720x576 at 25 fps for PAL. These are interlaces, so actually there are near 60 half frames per second for NTSC and 50 for PAL. We commonly denote DV NTSC as 480i or 480/60i to indicate the 480 pixels vertically (480 scan lines which actually carry visual information of NTSC's 525 total lines) and interlaced at 60 fields or half-frames per second. These digital specifications are used for MiniDV, Digital8, and DVD recording camcorders, as well as for DVD-video players of today.
All the above discussion concerns the 4:3 aspect ratio of "normal TV" (legacy of the last 40+ years). The aspect ratio tells us how wide versus how high. A common old TV screen is 4 parts wide to 3 parts high, or 1.33 to 1, but commonly just written 4:3. Widescreen refers to a screen that is wider than normal - usually 16:9 or 2.35:1 although there have been many various aspect ratios used.