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can LED technology support 1mm resolution ?

Discussion in 'Electronic Basics' started by Luc Filion, Nov 10, 2003.

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  1. Luc Filion

    Luc Filion Guest

    I'm working on a project for which I need to mount LED panels to
    display still text. I am looking for a very high LED resolution,
    something below 1mm dot pitch between each diode.

    Unfortunately, I cannot find any LED-based product that can actually
    handle such a high resolution (3mm dot pitch seems to be a standard on
    the market). And even with chip-on-board (bonding the LED die on the
    PCB), it seems that it is not possible to go that small.

    Do you know LED that can be integrated that way (1mm pitch) or should
    I look at other technologies (tech. I do not know about!).

    Note : I know LCD is an option, unfortunately, the lifetime of a LCD
    is rather low compared to LED (about 10 times less), so LCD is
    ungladly not an avenue for this current project.

    Thank you all!

    Luc Filion
     
  2. Ian Stirling

    Ian Stirling Guest

    Sure, it's possible.
    The LED chips are significantly smaller than 1mm.
    Wirebonding should be possible, though will be interesting to get the yield.

    What size of display?
    What for?
     


  3. You might want to have a look at Planar's electroluminescent (EL) displays.
    See the links below:

    http://www.planar.com/
    http://www.planar.com/Products/Embedded_Display_Sol/Custom_Family/

    They are a bit on the expensive side, but they are excellent in terms of
    visual clarity (they emit their own light, no viewing angle issues), and
    long life (MTBF of 100,000 hours minimum). I have used their EL240.128.45
    panel with built-in SED1335 controller and was *amazed* by the quality of
    these displays. Much better than LCDs or VFDs. Have a look at the links
    above.

    cheers,
    Costas
     
  4. onestone

    onestone Guest

    Can you comment on the need for such fine resolution? Unless these were
    being viewed very closely you wouldn't notice a slight gap between
    parts, in which case 0603's might work for you. I believe I have seen
    0402 LEDs claimed somewhere, but can't recall where, perhaps In
    Electronic Components mag from Asia. If you could handle 2mm x 1.25 the
    'GODZILLA' LEds fromAgilent have an oval lense which tends to help blur
    the gaps between them as well.

    Al
     
  5. Bob Masta

    Bob Masta Guest

    Funny, I just read a letter in Physics Today that discusses
    the early history of gallium phosphide LEDs, by one of the
    inventors. According to the author, one of the first uses
    was in a classified military project to put digital information
    on the film used in Royal Air Force reconnaissance planes.
    He says: "... the encapsulated lamps were 1/32 inch
    (just under 1 mm) in diameter". That was back in the
    early 1960's, so you can probably get them a lot smaller now.


    Bob Masta
    dqatechATdaqartaDOTcom

    D A Q A R T A
    Data AcQuisition And Real-Time Analysis
    www.daqarta.com
     
  6. Checking my Conrad (www.conrad.de) catalogue I find LEDs in 1 x 1 mm in
    red, green and yellow. So they are on the market.
     
  7. Parmin

    Parmin Guest

    Dr Engelbert Buxbaum <> while reading the
    NewsGroups, picked his nose and bring out online.com:
    Err, ever read about OLED? they are LEDs at something like .17mm pitch
    screen. And they are full colour too.

    Try OLED at google.

    D.
     
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