TRINTRON COLOR PICTURE TUBE
The Trintron or three in-line cathodes color picture tube was developed by ‘SONY’ Corporation of Japan around 1970.
It employs a single gun having three in-line cathodes. This simplifies constructional problems since only one electron gun assembly is to be accommodated. The three phosphor triads are arranged in vertical strips as in the P.I.L. tube. Each strip is only a few thousandth of a centimeter wide.
A metal aperture grille like mask is provided very close to the screen. It has one vertical slot for each phosphor triad. The grille is easy to manufacture and has greater electron transparency as compared to both delta-gun and P.I.L. tubes. The beam and mask structure, together with constructional and focusing details of the Trinitron are shown in Fig. The three beams are bent by an electrostatic lens system and appear to emerge from the same point in the lens assembly.
Since the beams have a common focus plane a sharper image is obtained with good focus over the entire picture area. All this simplifies convergence problems and fewer adjustments are necessary. The latest version of Trinitron was perfected in 1978. It incorporates a low magnification electron gun assembly, long focusing electrodes and a large aperture lens system.
The new high precision deflection yoke with minimum convergence adjustments provides a high quality picture with very good resolution over large screen display tubes.