Out of interest another type of display is the SED.
Its like a CRT but SED consists of a matrix of tiny cathode ray tubes, each "tube" forming a single sub-pixel on the screen.
Pity it didnt go anywhere due to low cost of LCD - Plasma's that were mature products.
A surface-conduction electron-emitter display (SED) is a flat panel color television technology currently being developed by a number of companies. SEDs use nanoscopic-scale electron emitters to energize colored phosphors and produce an image. In a general sense, a SED consists of a matrix of tiny cathode ray tubes, each "tube" forming a single sub-pixel on the screen, grouped in threes to form red-green-blue (RGB) pixels. SEDs combine the advantages of CRTs, namely their high contrast ratios, wide viewing angles and very fast response times, with the packaging advantages of LCD and other flat panel displays. They also use much less power than an LCD television of the same size.