High-definition TV is an expected next generation television broadcasting system, and the broadcast of which will start in 1990 in Japan. The system is also expected for the use of industrial application. For these requirement , 54 -inch, 110 -inch, and 200 -inch projection displays have been developed. The horizontal resolution of 1000 TV lines, the peak brightness of 410 cd /m2 (54-inch), and the contrast ratio of more than 100 for rear projection displays can be realized by the development of 9 -inch dual focusing projection tube, high resolution projection lens, fine pitch high contrast rear screen and large output horizontal deflection circuit etc..

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