Improving display quality by a digital convergence correction system for multibeam CRTs

J.K. Patrick Barels, Lex Lubbers, Cornelis Slump, Rudolf Kemner, Aartjan Hoeven

    Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

    2 Citations (Scopus)


    In the field of medical imaging there is a need for high-resolution high-brilliance monochromatic CRT displays. However, at higher brightness levels the resolution of these displays decreases, due to the increasing spot size. In order to improve the performance of the CRT display a relatively simple method, called the multi-beam concept, is introduced. Using this technique a higher brightness can be realized without an increase of the spot size and therefore a better display quality can be achieved. However, for successful exploitation of the multi-beam concept it is necessary to minimize the convergence error of the CRT display. For this purpose two circuits have been realized, where the convergence error is reduced by an analogue and a digital method respectively. The analogue implementation means an improvement for the applicability of the multi-beam concept, however, in order to achieve major image quality improvement the use of the digital system is necessary.

    Original languageEnglish
    Title of host publicationMedical Imaging 1996
    Subtitle of host publicationImage Processing
    EditorsMurray H. Loew, Kenneth M. Hanson
    Number of pages9
    ISBN (Print)9780819420855
    Publication statusPublished - 1996
    EventSPIE Medical Imaging 1996 - Newport Beach, United States
    Duration: 11 Feb 199613 Feb 1996

    Publication series

    NameProceedings of SPIE
    ISSN (Print)0277-786X


    ConferenceSPIE Medical Imaging 1996
    Country/TerritoryUnited States
    CityNewport Beach


    • Brightness
    • Cathode ray tube
    • Convergence
    • Interpolation
    • Luminance
    • Multiple beam
    • Resolution


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