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EMC Requirement for LCD modules

Discussion in 'Electronic Design' started by Spehro Pefhany, May 26, 2008.

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  1. 'cept the fact there's a window, which has to be exposed for most
    applications, that has large area of conductive patterns on it that
    is/are energized with AC?

    Best regards,
    Spehro Pefhany
     
  2. fernan

    fernan Guest

    Hi all

    Anybody has any experience in EMC requirements for LCD modules.

    I am currently working on a project that uses an LCD module with a
    builtin Hymax HX8238 controller. I am trying to figure out how much
    EMI/ESD mitigation I need down the line. It's got a grounded metal
    frame so I am assuming that is enough as a basic ESD protection for
    the module itself. The only thing I am worried about is down the
    ribbon cables.

    Any help would be great.

    fernan
     
  3. A ferrite "bead" shaped to fit the cable will help o limit the higher-
    frequency stuff coming out of the display down the cables. I have
    also seen ribbon cables looped two or more times through a ferrite
    donut.

    The radiated emissions out the front of the display will be harder to
    control. Transparent but conductive layer like indium tin-oxide coated
    sheet may help, or use a fine metal mesh if the Moire patterns are not
    too objectionable.
     
  4. Joerg

    Joerg Guest


    I had two recent cases and fixed it with meshes from this company:
    http://www.dontechinc.com/ccfwm.html

    Not cheap but gives the unit almost a mil-spec appeal. I had to rotate
    to 45 degrees to avoid too much moiree. After it's all spec'd out
    they'll offer custom cuts. Hint: Don't ever pull on this stuff, it'll
    stretch and then bulge very easily.
     
  5. Eeyore

    Eeyore Guest

    There's nothing special about LCDs.

    How much do you know about EMC to begin with ?

    Graham
     
  6. Eeyore

    Eeyore Guest

    Oh, what market is this for ? US regs are as ever different to the rest
    of the world.

    And are you more concerned about emissions or susceptibility ?

    Graham
     
  7. fernan

    fernan Guest

    I have had a bit of experience with EMC for SMPS. Those where usually
    sperate from the system load. This is the first time I need to combine
    power and system load.
    The ferrite clamp would have been a good idea. I looked into a bit,
    there isn't enough space to put something like that into the
    enclosure. I am thinking of using a EMIF10-LCD from ST. That should
    provide filtering, I just need to make sure I do need filtering

    fernan
     
  8. Eeyore

    Eeyore Guest

    That's very different.

    Why not answer the questions I asked ? I might be able to help then.

    Like .....
    Graham
     
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