A little idea for photo resist circuit boards

Discussion in 'General Electronics Chat' started by Ctenom, Jul 18, 2011.

  1. Ctenom

    Thread Starter Member

    Nov 1, 2010
    With LCD contrast ratios getting better (and also the LED displays). I was wondering if anyone with a spare 5 mins and a off cut of a photo-resistive circuit board, would like to try using a laptop display (or similar) to develop the board with a black and white image, Instead of printing a overlay. Probably wont work maybe too much bleed and the light from the black might develop the board. But it would be interesting to find out don't you think?
  2. Robin Mitchell

    Well-Known Member

    Oct 25, 2009
    you need UV light to develop those boards so im afraid your idea wont work :/
    But nice idea ;D
  3. Wendy


    Mar 24, 2008
    I don't see why it wouldn't work. LCD displays already use a back light, you just need to change the back light into a UV source. I could see the LED UV exposure lights in the Completed Projects forum being used with an LCD display. It could make for a nifty prototyping setup, but there will be technical issues, there always are with new idea. Bet it is nothing insurmountable though.
  4. someonesdad

    Senior Member

    Jul 7, 2009
    Clever idea -- if you can get UV lamps in and the LCD isn't completely opaque to the UV (I bet it will be because so many organic materials either absorb UV or fluoresce), realize that the optically clear plastic over the screen are almost always excellent absorbers of UV radiation, so you either need to get rid of it or replace it with something transparent at UV wavelengths.