I have seen blu rays on other tvs besides my own which is a big tv and have pretty good eyesight. seriously try it for yourself. Or research this or something. Its no bullshit what im sayin.
You shouldn't have said to research this. I deserve it fully if I'm just picking up the bait and I'm being trolled (nice job with that line if so, but if not... holy wow).
The difference between DVD and Blu-ray, other than that Blu-rays are often much better mastering jobs from the source, is simply actual internal resolution displayed on your screen (the pixel dimensions the original image is being resolved to before being displayed on your screen). This is independent of the
size of the screen on which it is being displayed unless the screen doesn't support a given resolution at all.
Research:
Typical DVD resolution depending on aspect ratio of course is 640x480 (also known as 480p). Full HD is a resolution of 1920x1080 (1080p). Here are how those sizes compare.
The image of a movie or whatever at that resolution is then stretched (well, not exactly, but to keep things simple) to fit the dimensions of your screen. Clearly and obviously, the 480p image is going to be stretched a lot more than the 1080, and the images will occupy the same space.
If I were on my home PC I would just take screencaps of DVD quality versus 1080p of the same content at the same size to illustrate, but I'm at work.
It is perfectly reasonable to contend that on a small screen (sub-25 inches), or viewing from very far away, or if you have poor eyesight, that it does not make a difference. In all other circumstances it is pretty silly to claim that.
edit: All of what the poster above me said is true and makes a big difference especially the color reproduction stuff, but I was just trying to explain it in the simplest terms