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Graphic LCDs / NHD-C12864WO-B1TFH#-M Contrast issue
« on: March 02, 2018, 10:40:41 PM »
Hi,
I have upgraded to this display NHD-C12864WO-B1TFH#-M because the one I was using from Newhaven was discontinued.
Its pin comparable except for the contrast section. This LCD needs a voltage divider (with a POT) to set the contrast.
Even with this setup I am having issues with the contrast, its very eratic.
Looking at the spec sheet it says that the Logic voltage should be 3.3V (I have this), now the JST connector that powers
the LED white backlight needs to be 3.4V to 3.6V, I hooked this up to my powersupply and this is fine. However there is
an Item in the spec sheet that says "Supply for LCD (contrast)" Vlcd page 5 of the spec sheet, it says 9.2V to 9.8V and on page
3 of the mechanical diagram it says Voltage 3.0V VDD, 9.5V VLCD. Where is the hookup for VLCD? IM confused that should be 9.5V?
Any help would be appreciated.
Thanks
I have upgraded to this display NHD-C12864WO-B1TFH#-M because the one I was using from Newhaven was discontinued.
Its pin comparable except for the contrast section. This LCD needs a voltage divider (with a POT) to set the contrast.
Even with this setup I am having issues with the contrast, its very eratic.
Looking at the spec sheet it says that the Logic voltage should be 3.3V (I have this), now the JST connector that powers
the LED white backlight needs to be 3.4V to 3.6V, I hooked this up to my powersupply and this is fine. However there is
an Item in the spec sheet that says "Supply for LCD (contrast)" Vlcd page 5 of the spec sheet, it says 9.2V to 9.8V and on page
3 of the mechanical diagram it says Voltage 3.0V VDD, 9.5V VLCD. Where is the hookup for VLCD? IM confused that should be 9.5V?
Any help would be appreciated.
Thanks