Physics paper: Technology (past, present, future)?

I think you could write a paper on TV Pixels. Past and current technology creates pixels that spread out a single color of light in all directions using electrons and a phosphor (CRT), plasma gas and a phosphor (Plasma TV), polarity blocking liquid crystals with a flourescent or LED backlight. You can also mention other technologies like SEDs and FEDs which were phased out of development a few years back. Anyway, all of these technologies create a single pixel made of three colors of varying intensity and they each attempt to project the imagery in a wide range of directions.

More advanced technology involves emitting different colors in different directions from one pixel (or neighboring pixels that would normally be the same color). This is the basic premise behind 3D TV. Looking at a single pixel from one angle shows one part of one perspective image and the other angle shows the other (the angle where it changes straddles the eyes of a viewer). The means of doing this varies (3D glasses filter neighboring or alternating pixels or lenticular lenses/parallax barriers block/magnify neighboring pixels). This technology already exists.

More advanced technology involves projecting more than two colors from a single pixel or neighboring pixel. In real life, every point in space has light passing through it in every direction. More often than not, the light varies considerably in every direction. To truly recreate real life, a pixel has to be able to produce a unique color in every direction. This is the future of pixel technology. Holografika has a display called "Holovizio" that projects unique colors from each horizontal direction, but the same color in each vertical direction. The end result is horizontal motion parallax so you can move left or right and see different things at each pixel that yield different 'views' (they call them 'voxels' for the 'volumectric' imagery they produce).

Microlenses and integral imaging work similarly. A small perspective image at each point is magnified so it only shows part of it in each direction. This effectively creates a different pixel color in each direction from a complete micro image. The major drawback to this system is that it only works over a limited range where the curved surface of the microlens doesn't hit the neighboring microlens. Dynamic displays with this technology aren't necessarily being developed (as far as I know) but the technique is valid.

Holograms use seemingly random patterns etched into a surface by laser light. When the same laser hits the surface, it projects light in each direction that matches the original brightness and darkness of the objects projection onto the surface. The diffraction patterns without laser light are not easy to reproduce and only create a different 'brightness' in each 'pixels' direction. In theory this can be extended to more advanced pixel like areas on a surface.

Finally, I wrote a book about a more mechanical technique to create a complete image that is projected in each pixel. Unlike microlenses the picture is created on a curved surface projected through a single point (the image can be a physical printing, a splay of fiberoptics, or curved mirrors) which can use the volume behind the display to compress the images together at a much greater extent and at any angle (up to parallel to the surface, though a second pixel on the other side could cover the other half of the spherical projection). I call these pixels 3Pixels and 4Pixels depending on whether they show a different color in every direction to create a non-changing 3D image or they do that and can change to create a moving 3D image (a "4D" image with the fourth dimension being time).

So the pixel on a display is slowly evolving from singly projected colors of varying brightness and angle of effect to a multicolor changing projection in every direction.

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There are hundreds of Wikipedia pages you can plagiarize, er, research on the history of practically anything technical.......