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Embedded Forum LCD got dark, any idea why?
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  • charging
  • lcd displays
Related

LCD got dark, any idea why?

koudelad
koudelad over 1 year ago

Hello,

I have a universal charger for up to 4 battery packs. Over the past year, 4 displays in the device got partially dark and are readable from different angles only, not from the standard 6:00 view.

Any idea why this happened? I think it was not in direct sunshine, but guarantee (even if it did, if was in behind a strong glass and ventilated area). It was in operation for charging maybe ca 100 cycles for some battery packs and the unit is 1-2 years old. Maybe heat from the inside? (Poor thermal design? I haven't opened the unit, yet).

I hope the LCDs could get replaced, but I am afraid it will happen again.

battery charger

Thank you,

David

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Top Replies

  • dougw
    dougw over 1 year ago in reply to Jan Cumps +3
    All causes should be low probability, Here is a more in depth list of some possibilities... The LCD sandwiches have this bias when built due to manufacturing tolerances, but it can be overcome by the…
  • Jan Cumps
    Jan Cumps over 1 year ago in reply to Gough Lui +2
    Could it be related to an improper firmware/driver, that messes with the display drive waveforms? If they aren't properly balanced, LCDs can become charged. Wondering because all 4 have a similar shadow…
  • kmikemoo
    kmikemoo over 1 year ago in reply to dougw +1
    dougw Good list. Fluke displays exhibited loss of characters due to the elastomeric connector oxidizing. A little alcohol and allowing them to flex a bit usually brought them back in line. My guess…
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  • Gough Lui
    Gough Lui over 1 year ago

    I've had many HD44780-based/clone displays and I've not seen this sort of thing happen just to the middle. I would suspect heat or maybe pressure on the glass sandwich, but perhaps maybe it's a problem with that particular batch or model of display ... or maybe the way they are mounted causes some "warp" or pressure to accumulate in the centre.

    Usually if it were a problem with the analog contrast voltage, then it would affect the display uniformly, rather than in the centre.

    - Gough

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  • Jan Cumps
    Jan Cumps over 1 year ago in reply to Gough Lui

    Could it be related to an improper firmware/driver, that messes with the display drive waveforms? If they aren't properly balanced, LCDs can become charged. Wondering because all 4 have a similar shadow pattern.

    https://www.sparkfun.com/datasheets/LCD/HD44780.pdf page 37.

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  • Jan Cumps
    Jan Cumps over 1 year ago in reply to Gough Lui

    Could it be related to an improper firmware/driver, that messes with the display drive waveforms? If they aren't properly balanced, LCDs can become charged. Wondering because all 4 have a similar shadow pattern.

    https://www.sparkfun.com/datasheets/LCD/HD44780.pdf page 37.

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