Monochrome 128x32 OLED bad pixels

[fat16lib]

I bought three Monochrome 128x32 OLED displays but was surprised that each had a bad pixel. The bad pixel is in a different spot on each display. Is this normal?

I love the display and wrote a character only library to eliminate the 512 byte RAM buffer. This library also allows both bit-bang and hardware SPI so it works well with the Data Logging shield.

Here is an example data logger with an 18-bit MCP3422 differential delta-sigma ADC and the 128x32 display.

mcp3422oled.jpg (248.73 KiB) Viewed 533 times

At max gain the LSB of the MCP3422 is about two micro-volts so it can log voltages a thousand times smaller than the Arduino ADC.

[adafruit]

thats very unusual, we have never seen a bad pixel, can you demonstrate it by filling the screen?

[fat16lib]

Below are the pictures. Yes I did remove the protective film. Sorry Display3 is a bit fuzzy.

I looked at the displays with a 10X loupe and it appears to be dirt or a defect between the two layers of glass. It is not on the outer surface.

Look at display2, my best picture. It has a large piece of dirt or defect that doesn't line up with pixels.

Display1:

Display1.jpg (577.68 KiB) Viewed 520 times

Display2:

display2.jpg (557.47 KiB) Viewed 520 times

Display3:

display3.jpg (516.22 KiB) Viewed 520 times

[adafruit]

thanks, we will update our test to help us identify this issue (our current one just draws an image)

you can email support@adafruit to get replacements

[fat16lib]

I Received the three new Monochrome 128x32 OLED displays last week and finally tested them. All three are perfect!

Thanks for the great service Adafruit.