Tri colour LED

Discussion in 'General Electronics Chat' started by Faisal 2121, Nov 4, 2008.

  1. Faisal 2121

    Thread Starter New Member

    Oct 15, 2008
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    How many pn junction a tri colour LED has? I think its three, am i right ?
     
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    5,072
    6
    You are correct. Typically a tri-color LED houses three LEDs under one lens, and ties the cathodes together on a common lead.
     
  3. Wendy

    Moderator

    Mar 24, 2008
    20,765
    2,535
    I always thought tri color as in Red and Green, which could produce Yellow (tricolor = 3 colors). You're discribing a RGB diode.

    TriColor as I'm thinking of it is two leads, two LEDs, reverse the polaritry with AC to get yellow.
     
  4. bertus

    Administrator

    Apr 5, 2008
    15,645
    2,344
    Hello,

    There are also leds with red and blue in one, the third color look purple/pink (depending how bright blue is) like.

    Greetings,
    Bertus
     
  5. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    RGB LEDs are available in common cathode and common anode configurations.

    They both have three PN junctions.

    There are also red/green LEDs that have but two PN junctions. A yellowish-brown color can be displayed by lighting up both the red and green.

    There are also many other color combinations available nowadays.
     
  6. trrobbie

    New Member

    Dec 11, 2008
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    The newest ones that rad shaft has are red, green and blue in one unit. Just got one a few weeks ago.(its a cc unit) Interesting thing to play with. I`ll find a use for it someday!? Robbie in wyoming
     
  7. Audioguru

    New Member

    Dec 20, 2007
    9,411
    896
    My solar garden lights have an RGB LED with 2 wires and 3 LEDs inside that slowly fade the colours.
     
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