Trinitron 
Sony's brand name for a type of CRT that it developed for use in televisions and computer monitors. It differs from the standard tube types because it employs an aperture grille (wires stretched vertically down the screen) instead of the usual shadow mask (a metal plate with holes in it). Many observers believe that aperture-grille tubes generate brighter, clearer images than those using shadow-mask technology. You can tell if you are looking at an aperture-grille tube by the presence of one or two very thin black horizontal lines that cross the screen; these lines are the supports for the aperture grille. Sony no longer holds the patent on this design; many other manufacturers now use it in their own monitors. (An example is the NEC-Mitsubishi Diamondtron line.)