HDTV Display with a 16-cm Projection CRT

Tetsuo Asano, Electron Tube & Devices Division, Hitachi, Ltd.
Yasuhiko Uehara, D. Eng., Electron Tube & Devices Division, Hitachi, Ltd.
Toshimitsu Watanabe, Multimedia Systems R & D Division, Hitachi, Ltd.
Ken'ichi Matsumoto, Image & Information Media Systems Division, Hitachi, Ltd.


A 16-cm (6.9-inch) high-resolution electrostatic focusing projection cathode-ray tube (CRT) has been developed for high-definition television (HDTV) display applications. Improved focusing characteristics are achieved by developing a new high-resolution phosphor screen capable of reducing light scattering in the phosphor screen, as well as a large-aperture, high focus voltage, uni-potential focusing (Hi-UPF) electron gun. As a result, 10% beam-spot diameters of 0.19 mm and 0.26 mm were achieved at cathode currents of 0.5 mA and 5.0 mA, respectively. This technology enables excellent image quality for HDTV projection displays.

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