pixel size in monitors/televisions

Let us assume that you want a 4K model of either.
Is the physical size of the pixel smaller in a smaller screen version?

Well if you have to fit the same number of items into a larger area, without introducing gaps in between the items, the items will have to be bigger.

When it comes to a screen, where you want maximum illumination/unit area, and will also likely start to see larger gaps, as viewing distance for computer screens tends to stay pretty constant, enlarging the area of the pixels as you enlarge the screen would seem to be the way to go. At least this seems to be my experiance of using LCD monitors over the years.

Alan

Yes, the pixels of smaller screens with the same resolution need to be smaller.
http://dpi.lv/

There's quite a bit to digest in that link drmaxx...it satisfied my initial question and many follow-ups I would have had...thanks for link.