NHD-3.12-25664UCY2 display - inconsistent pixel brightness in same areas
Hello,
Using the NHD-3.12-25664UCY2 (256 x 64) using the 4-wire interface I have no problems sending full screen images and displaying them. However all the images and patterns I send use the same grayscale value. However, on the display some of pixels vary in their grayscale/intensity? It's always the same pixels too. I have tried two different displays with same results. I would think if its noise that the pixels would be random but they are always the same. I checked the initialization sequence and it matches example in the data sheet.
I have attached two images. One with a picture and one with all the pixels set at the same greyscale level (0x04). On the image with all set to the same greyscale you can see a rectangle area at the left and right side of the LCD - but I am sending all the same greyscale values. With the picture on some of the pixels are of different brightness/grayscale.
Please help.
Thanks,
Bill
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Hello Bill,
Unfortunately because these are Passive Matrix OLEDs the brightness of the pixels can vary based on how many pixels are on in a row.
The brightness will be higher if you only have a few pixels lit, as opposed to having the whole row on.0 -
These OLEDs are passively drawn, which means that each line is lit at once. If you have a line with almost all the pixels lit it wont be as bright as a line with only 50% or less lit up.
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