How many PIXELS is the Human Eyeball?
i think somebody got the point with the word seamless. first part is getting seamless pixels (so you can not see the discrete components of the picture, being pixels or dot on paper), so you can say that it is enough. The second part is then to consider if we admit that it is enough to consider having this only in one direction, eyes focused on a screen) or covering all the field of vision. the third part is not really really a pixel count, but rely more on the refresh rate (the pixel lifetime). And the fourth part is counting it twice (we got two eyes) for depth perception. Probably you have been already fooled by some demo of HD screen disguised in a window or fish tank, when seen at reasonable distance looking like real life until you convince yourself of the trick by gluing you nose on the screen.