The luminescent screen of a cathode ray tube includes an array of monocrystalline or amorphous phosphor rod-like elements which are covered with a reflective coating except for one end of each element which serves as an output face. The phenomenon of the light trapping is advantageously exploited to...http://www.google.fr/patents/US4807241?utm_source=gb-gplus-shareBrevet US4807241 - Electron beam pumped laser
