Author Topic: Contrast supply for NHD‐24064WG‐ATFH‐VZ#  (Read 7880 times)


  • Newbie
  • *
  • Posts: 2
  • Karma: 0
    • View Profile
Contrast supply for NHD‐24064WG‐ATFH‐VZ#
« on: May 19, 2014, 08:22:18 AM »

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.


  • Administrator
  • Hero Member
  • *****
  • Posts: 357
  • Karma: 34
    • View Profile
Re: Contrast supply for NHD‐24064WG‐ATFH‐VZ#
« Reply #1 on: May 19, 2014, 09:17:00 AM »
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).


  • Newbie
  • *
  • Posts: 2
  • Karma: 0
    • View Profile
Re: Contrast supply for NHD‐24064WG‐ATFH‐VZ#
« Reply #2 on: May 19, 2014, 10:01:31 AM »
Thank you for the quick response you have clarified my question nicely.


Display NHD-C12864WO-B1TFH#-M contrast options.

Started by craig@oregonembedded.comBoard Graphic LCDs

Replies: 1
Views: 284
Last post October 28, 2019, 01:43:00 PM
by Alee_S
NHD-7.0-800480EF-ASXN#-T Bad contrast, background too bright

Started by wilfridBoard TFTs

Replies: 0
Views: 140
Last post November 12, 2019, 12:00:39 PM
by wilfrid
NHD-2.7-12864UCY3 brightness/contrast adjusting

Started by EK701Board OLEDs

Replies: 3
Views: 6620
Last post January 28, 2016, 09:51:31 AM
by Saurabh_B
software controlled contrast is not consistent

Started by pabbottBoard Character LCDs

Replies: 2
Views: 4510
Last post September 10, 2015, 02:17:08 PM
by pabbott
NHD-0108CZ-FSW-GBW-33V3 contrast voltage

Started by perkyBoard Character LCDs

Replies: 3
Views: 5314
Last post February 12, 2016, 04:01:29 PM
by perky