NHD-0420DZW-AY5 to replace NHD-0420DZ-FSW-FBW

BenFR30

• January 16, 2018 08:03

Dear,
We developp few years ago a board to command a LCD character display (4x20), NHD-0420DZ-FSW-FBW.
It works perfectly.
After some researches, I found NHD-0420DZW-AY5, the OLED characters display.
In the datasheet we can see that is compatible with LCD display, but, when i replace my LCD display with the OLED display, it doesn't work.

Is it this OLED display 100% compatible to replace LCD display, with no firmware modification ?

That is the point i'm searching for.

Many thanks in advance for your feedback, I am stuck :(
Benjamin

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  Saurabh_B

  • January 17, 2018 08:18

  The display should be compatible for the most part, however a few minor adjustments for the firmware might be necessary.
  The instruction execution time for the Oled is a fair amount slower so you might need to add a few delays or check for the busy flag before sending consecutive instructions.
  
  The OLED does also require a larger current input through the +5V (VDD) Input as well, can you check to see if you are limited as to how much current you would be able to supply?

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  BenFR30

  • January 18, 2018 04:30

  Hi,
  Thank you for your feedback,
  I have an external supply, so i have enough poower.
  
  I'm now trying to improve delay.
  Thank you for your help.

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