Contrast supply for NHD‐24064WG‐ATFH‐VZ#

Shaun_Caraway

• May 19, 2014 08:07

Hello

I am using the NHD‐24064WG‐ATFH‐VZ#. I have never used a graphics LCD before and am curious about the VEE voltage supply for this particular LCD contrast supply. According to the diagram in the data sheet on page 4 it would appear that the contrast voltage supply (VO) is created by using a voltage divider or some sort of potentiometer to allow adjustments hooked up between VEE (Pin #9 ) and VO (Pin #4) .

I see according to the table on page 4 of the data sheet that VEE is an output voltage and VO is labeled as supply voltage.

My question is do I need to supply VEE in addition to the VDD and the  LED +/- or is VEE supplied by the LCD module itself?

Thank you.

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• 

  Michael_L

  • May 19, 2014 10:07

  VEE is supplied by the LCD module.  That pin outputs a voltage of -10V.  This negative voltage is used in conjunction with a potentiometer (connected between VEE and Ground, with the adjustable pin connected to V0) in order to provide approximately -7V for contrast (adjustable).

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  Shaun_Caraway

  • May 20, 2014 10:07

  Thank you for the quick response you have clarified my question nicely.

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