Matrix-Driven Electron Source for MDS Flat-Panel CRT

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  • Hamada Kiyoshi
    Device Process Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd.
  • Nonomura Kinzo
    Device Process Technology Research Laboratories, Matsushita Electric Industrial Co., Ltd.
  • Tomii Kaoru
    R & D Groupe, Matsushita Research Institute Tokyo Inc.

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  • MDS (Matrix Drive and Deflection System) カラーフラットパネルのマトリックス電子源
  • MDS Matrix Drive and Deflection System

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Description

A matrix-driven electron source essential for a large high-definition MDS flat-panel CRT has been developed. This electron source consists of twe parts, triode with a vertically extended line cathode and two grids, and switching electrodes for vertical scanning by an electron beam emitted by the line cathodes. This structure allows a high emission current with a low voltage modulation signal. Driving circuits and the structures of the grids are simplified by a new driving method in which a modulation signal is applied to directly-heated type line cathodes instead of grids. Beam current from each segment of the electron source is made uniform by a newly-developed correction circuit which equalizes the cut-off voltages of each segment.

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