Direct-view and projection CRTs for HDTV

A series of direct-view and projection type CRTs has been developed for high-definition TV (HDTV) use. The technical aspects of direct-view 40-in and 30-in CRTs and projection 7-in and 12-in CRTs are described. The direct-view CRTs have an aspect ratio of 5:3 and a resolution of more than 1000 TV lines. With the fine and uniform pictures displayed over the entire screen, the CRTs are suitable for studio monitors and are also expected to be used for home TV sets. The projection CRTs have been developed for displaying picture size larger than 40 in. With the 7-in projection CRT, a resolution of 1000 TV lines and a peak brightness of 120 ft-L have been realized on a 50-in projection screen. With the 12-in CRT a 180 in projection screen with a peak brightness of 15 ft-L, about twice as high as a conventional CRT, has been realized.<
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