Electron-optics of the Fast Intelligent Tracking (F!T) tube: A CRT without a shadow mask

M.P.C.M. Krijn, W.L. IJzerman, H.B. Brink, van den, O.H. Willemsen, M.C.J.M. Vissenberg

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    In this paper, we describe the electron-optics involved in realizing a maskless CRT based on tracking the electron beams along horizontally aligned phosphor lines. We discuss the boundary conditions in order for the system to function. Emphasis is placed on the requirements of color purity, beam current, and spot size. A dedicated electron gun has been designed and tested. Results indicate that the spot-size requirements for the feasibility of the concept can be met. The depth of focus, in terms of the allowed mismatch of the dynamic focusing voltage, is small. Inter-beam space-charge repulsion turns out to be unproblematic. The cathode drive is shown to lead to beam displacements that cannot be corrected. Consequently, a grid-1 drive has to be used. Keywords: CRT; tracking; electron gun; spot size
    Original languageEnglish
    Pages (from-to)325-332
    JournalJournal of the Society for Information Display
    Issue number2
    Publication statusPublished - 2003


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