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Interesting PCB production method

Discussion in 'PCB Layout, Design and Manufacture' started by kellys_eye, Dec 22, 2017.

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  1. kellys_eye

    kellys_eye

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    Jun 25, 2010
    Caught a Youtube video the other night of a PCB manufacturing technique that impressed me.

    It was based on covering the copper board with photopolymer daylight resin as the etch resist but the 'clever' part was using an LCD panel as the transparency.

    The LCD panel was stripped down to its basic element and used to display the board track layout in the standard manner, simply connected to a PC video output port. The 'backlight' was replaced with UV LEDs to enable the resin to set (of course) and the exposure took only a few seconds.

    The finished board looked sharp and clean (after etching) and seemed a very respectable method of production.

    Now, with the availability of small HD tablets of extremely high dot pitch I reckon you could do a pretty good board - although I've not tested the practicalities - given LCD pitches of 300dpi they are as good as many matrix printers and potentially 10 thou or better track widths (theoretically as low as 4 thou). Certainly the old tablet I have (1920x1080 on a 7-inch display) would be ideal for eurocard sized pcbs (160mm x 100mm).

    The only downside (small) is the cost of the 3D resin but given the tiny, tiny amounts used a single bottle would go a long, long way.



    I've not seen this method before but was impressed by the results. It adds to the many ways of home manufacture of pcbs that I've seen.
     
  2. Alec_t

    Alec_t

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    I can see that dot-matrix inkjet or laser printing works, because ink bleed or toner flow can produce continuous tracks, but won't a LCD panel result in distinct dots rather than continuous tracks?
     
  3. kellys_eye

    kellys_eye

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    Jun 25, 2010
    I suspect there's a similar bleed between pixels in the process I linked to. Certainly the board that was shown produced didn't have any of the usual raggedy edges tat a dot matrix method usually produces.
     
  4. dave9

    dave9

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    Mar 5, 2017
    There would have to be bleed to whatever extent the panel had a viewing angle other than 0'. It would just be lower intensity so a little exposure time increase.
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Jan 21, 2010
    After painting on the solder paste, I'm a little surprised the board wasn't just stuck in an oven (or even on a skillet) :)
     
  6. NMNeil

    NMNeil

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    Oct 3, 2014
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