The war put an end to technical implementation of Flechsig's shadow mask picture tube. LCD, LED, plasma and CRT (picture tube) color video displays all use this method. Trinitron/WEGA is Sony's flat version of the Trinitron picture tube. In 1963, it introduced the first rectangular color picture tube. It is the third largest picture tube manufacturer in the world. The crossover of the three electron beams of a three-gun tri-color picture tube. Horizontal and vertical electromagnets are placed at the picture tube neck, called the "yoke". The most important component in the monitor is the picture tube.