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Thread: solder directly to lcd screen?

  1. #1
    MySQL Error soundman98's Avatar
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    solder directly to lcd screen?

    A while back, i found some digital battery gauges for $4 each--about as much as i could build my own, so i bought a bunch of them..

    i am just getting around to dissecting them, and ran into a problem-- the housing is too big, and they use a conductive rubber strip between the screen and the pc board.

    is there anything that can be done to separate the display from the board?

    the main boards pads are easy to solder:


    but what about the pads on the back of the screen?


    thanks!

  2. #2
    Raw Wave
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    The contact is via a pressure device. I doubt solder would stick, and the temp would crack the glass.
    And ionic spray or substrate.....

    The easiest would be to find a matching pitch board that you could solder extension wires from the PCB to, and then sandwich the original rubber between it and the LCD.

    You probably know the rubber is parallel but isolated conductive strips, but usually hundreds as opposed to the mere 12 or so "pads" so that there is no need for rubber alignment - only the PCB & LCD need be aligned.

    There may be other ways - anything with tensioned or springy conductors that can be soldered to (of the same pitch) can negate the use of the rubber.

    Otherwise another display....

    I know - they're a pain. I've been seeking a small backlit voltmeter...

  3. #3
    MySQL Error soundman98's Avatar
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    hmm, i wonder if that 'wire glue' stuff would work for this-- where i could glue the wires to the lcd pads..

    ever tried it?

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