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White displays?

Discussion in 'Electronic Design' started by Michael, Feb 28, 2007.

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  1. Michael

    Michael Guest

    Has anyone ever seen any white led 7 segment displays?

    Do they exist?
  2. Tim Shoppa

    Tim Shoppa Guest

    Blue LED certainly exists (I reviewed Lite-On LTS-5501AB here in this
    newsgroup several years ago) but I've yet to see white, even though
    the semiconductor technology should be similar.

    Numitrons have nearly-white segments, especially at 7V, but the
    filaments tend to burn out quick if you run them there :).

    I've also seen 7-segment displays built with 4-foot flourescent tubes!

  3. Ken Smith

    Ken Smith Guest

    Just a thought:

    The normal white LED is really a blue one pumping a phosphor. If this
    same phosphor was made part of plastic sheet over the face of the display
    you may get a white display.

    I'm thinking of paints like "international orange" that usually contain
    frequency down converting materials. When you add some blue directly from
    the LED, you will see white.
  4. TT_Man

    TT_Man Guest

    Forge europa uk
  5. jasen

    jasen Guest

    put a yellow fluorescent filter in front of a blue one?

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