NHD‐0216HZ‐FL‐YBW‐C adjusting contrast with manufacturer disabled pin

8510Leo

• February 15, 2016 09:07

Hello,

In this LCD manufacturer disabled pin 3 which is used in other versions of the basic modules for adjusting a contrast. Is there any way to adjust the contrast, as a text on the module is barely visible at current settings?

Thanks,
Leo

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  8510Leo

  • February 16, 2016 09:07

  I found that the contrast can be significantly changed by modifying Supply voltage of the module (VDD). Actually, it was stated in the technical note as an (additional to VDD) parameter Vlcd - 4.4V.
  
  Leo

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  Saurabh_B

  • February 17, 2016 09:07

  HI,
  
  This display does have a temperature compensation circuit built in.
  This circuit is tied to both the VDD, so modifying the input voltage will affect the contrast. The VLCD is VDD-V0, the V0 is supplied through the temperature compensation circuit.
  At 25°C this should produce approx. 0.6 V.
  
  When used normally what voltage do you see across the VDD and VSS pins?

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  8510Leo

  • February 27, 2016 09:07

  Thank you for the comments. At room temperature and VDD +5V module demonstrates a very good contrast. So, this is 4.4V Vlcd.
  
  Best,
  Leo

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