To add on to that, LCD screen only have one resolution where they work best. Any higher or lower than that, and the image quality is not that good. You can see this in action on laptop screens, windows displays and error telling you that.
I high resolution doesn't really mean that the imasge gets sharper, is just that there are more pixels on the screen per square inch. This could increase the sharpness and it gives you a larger screen area, but in return for that, it is smaller, and more eye straining.