we designed an electronic board with the NHD-0420CW-AB3 display and we have some faulty devices.
As shown in the attached picture, the pixels that makes each character are not fully clear with the same brightness.
The display is driven through I2C and pin 2 and pin 3 of the display interface are at +5VDC.
What could be the reason of the failure?
The failures emerged after only one month @ 25 deg C constant temperature.
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