LED technology offers many reliability advantages over incandescent bulbs for the backlighting of automotive telltales. However, up until recently, LED solutions were not practical due to the high cost. In order to get sufficient legend brightness, automotive designers were forced to either use expensive multiple chip LED indicators or expensive metalized reflectors. This paper describes how a single chip LED indicator can be used to illuminate a 15 mm by 15 mm automotive telltale with an inexpensive white molded plastic optical cavity. Using this indicator and cavity, luminous sterances of over 1000 cd/m2 are achievable in the center of the legend and luminous sterances of over 400 cd/m23 are achievable in the corners of the legend. The paper describes a complete telltale solution including this new LED indicator, the reflector design, and optical test results.


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    Titel :

    Backlighting automotive telltales with LED indicators


    Weitere Titelangaben:

    Rückleuchten für Autokennzeichen mit LED-Anzeige


    Beteiligte:
    Hodapp, M. (Autor:in)

    Erschienen in:

    SAE-Papers ; Mar ; 1-8


    Erscheinungsdatum :

    1990


    Format / Umfang :

    8 Seiten, 12 Bilder, 3 Tabellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Backlighting Automotive Telltales with LED Indicators

    Hodapp, Mark | SAE Technical Papers | 1990


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    Hodapp,M. / Hewlett Packard,US | Kraftfahrwesen | 1990


    Using LED indicators for automotive telltales

    Hodapp,M. / Hewlett-Packard,US | Kraftfahrwesen | 1987


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