Newhaven Display Forum

Newhaven Products => Graphic LCDs => Topic started by: samuelproulx on November 27, 2016, 09:01:06 AM

Title: NHD-C12864WC-FSW-FBW-3V3-M random pixels at init
Post by: samuelproulx on November 27, 2016, 09:01:06 AM
Hello!

I am using a  NHD-C12864WC-FSW-FBW-3V3-M graphic display and at the initialization (which I followed the datasheet to do) , there are random pixels appearing a little bit everywhere on the screen. I am not sure for what reason this would happen, so I figure maybe someone has had this issue before?

And we can also see on the lcd that the lines where the pixels are printed, the contrast seems different as well?

What am I doing wrong or am I missing something?

Thank you for any help ^_^

Here is a picture of it : http://i.imgur.com/2M7B1oM.jpg (http://i.imgur.com/2M7B1oM.jpg)
Title: Re: NHD-C12864WC-FSW-FBW-3V3-M random pixels at init
Post by: Saurabh_B on November 28, 2016, 08:33:02 AM
It seems that your contrast might be set a bit high.

The random pixels can result from any mix of information that could be stored in the RAM for the display controller.
Have you tried to clear the screen after initializing it?
Title: Re: NHD-C12864WC-FSW-FBW-3V3-M random pixels at init
Post by: samuelproulx on November 28, 2016, 09:18:20 AM
I was able to clear the screen after all and there are no random pixels.

Although now my issue is that when I write black pixels to the lcd, the entire column goes white (as you saw on the image). Is this also due to contrast? I have it set to the value recommended in the datasheet init, so 0x10 (16/64)
Title: Re: NHD-C12864WC-FSW-FBW-3V3-M random pixels at init
Post by: Saurabh_B on November 28, 2016, 02:04:11 PM
This is most likely due to the high contrast. I would recommend using a lower setting for the electronic volume.
This will determine the pixel clarity.