purplebluelove99 wrote:What's the difference between wide screen and high definition t.v.?
Well a widescreen tv is one that's wider than the 4:3 (1.33 wide) tube used for most of TV's first fifty years, and its screen proportion is nominally 16:9 (1.78 wide).
Since most of the software and broadcasts made till recently have been in what's called "standart definition" NTSC, they usually have a vertical resolution (or scanning lines) of about 480 pixels. (in PAL countries 576). Since standart definition video has a maximum of 720 pixels ACROSS its width, a standart definition widescreen TV can get away of having an horizontal resolution of about aproximately 400 pixels per picture height. (cus 405 x 1.78 = 720)
that would be 480 vertical x 720 horizontal = 345,600 pixels of image quality.
Since standart definition pixels are non square (the Display stretches them to the correct shape) but visualizing that is slightly difficult, 345,600 pixels is equivalent to a computer image of:
440 vertical x 785 horizontal
(square pixels) for a 1.78 wide image. That's the square pixel equivalent of the maximun definition you'll get on a Standart Definition Widescreen TV playing NTSC DVDs.
There are some widescreen displays (examples: Plasmas, LCDs and DLPs) that have higher resolution in their panels. Like 720 x 1280, or 768 x 1366. These panels upsize the 440 x 785 DVD image just like Photoshop does when you change the size of a pic. If done correctly, the resulting image can look smoother and less pixelated than the regular size DVD image, but it CAN NOT look more detailed. There's a limit to the size you can blow up this image and still look satisfactory. If the resizing is done by subpar methods, the image can actually look fuzzier and worse than the original DVD image too.
Since 720 x 1280 is one of two resolutions in the HDTV spec, these displays can be called High Definition. (I wouldn't. I'd call them Med-Def

)
Now, High-Definition-TV can come in two resolutions: 720 x 1280, and the much higher 1080 x 1920.
There are a few 1080 x 1920 (or even higher!) displays, and more will come in the following years. THOSE I would call High Defintion
As you can see a High Definition Display, when fed a true High Definition source, be it High Def Broadcast, puny HD-DVD, or mighty
Blu-Ray can show more detail and sharpness than DVD.
Med-def 720 x 1280 (921,600 pixels) is 2.67 times the detail and size of DVD's 440 x 785 (354,600 pixels)
High-Def 1080 x 1920 (2,073,600 pixels, yeah 2 million) is 6 times the detail and size of DVD's 440 x 785 1/3 of a million pixels.
440 x 785

1080 x 1920
If you watch widescreen DVDs on 4:3 TVs right now the differences are 33% more dramatic, cus there the resolution is less when the wide image is shrunk to fit into the square 4:3 shape.
there it's the equivalent of 380 x 680 (259,200 pixels) vs HighDef's 1080 x 1980 more than 2 million pixels. Eight times more!
(widescreen movie)
380 x 680

1080 x 1920
So if you're satisfied with Star Wars or the Lion King on DVD on a 27" 4:3 TV, or a 32" Widescreen TV, you'll love them on High Definition, on a 80" TV or Projection Screen from the same sitting distance.
Heh you probably can make it even larger than that and it'll still look great.
So that's the difference between a widescreen TV and High Definition TV
The first alludes to the shape of the display, the second to the resolution and detail of the display.