How is Raster and Random Scan Display different? Raster scan display forms an image with pixel whereas a Random scan display works with Geometric primitives, but even a geometric primitve( a line) is made up of pixels so what is the difference?
A raster display draws every pixel on the screen in every frame whether there is something to show or not.

A random scan display activates only those pixel which are occupied by an geometric primitive.

So yes, they both use pixels, but the difference is in how they draw the pixels onto the screen.