Yeah, it's not going to be as good. Think about this logically for a second: if you have 1024x768 pixels on a 13/15-inch screen, then you take those same 1024x768 pixels and put them on a 60/100-inch screen, then the pixels are logically going to be much larger. As an example, if the pixels were one mm on the smaller display (which is a good bit larger then they actually are, but just to make the math easier), then on the larger display they would be approximately 4-6mm, depending on the actual relative measurements. That is why the projector will always look blurrier unless you can get a very high resolution one.
jW