Electronics > Projects, Designs, and Technical Stuff

Waveshare e-paper display not showing good red colour

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Amper:
Hi!

I just started playing with a "1.54 inch e-Paper" display module from waveshare, 200x200px b/w/r.

https://www.waveshare.com/w/upload/e/e5/1.54inch_e-paper_V2_Datasheet.pdf

Im using this lib for control:

https://github.com/ZinggJM/GxEPD

Black works beautifully, but the red colour is nothing like the images i found, not only in ads but also non commercial videos.
Its very pale, in the best case orange, very very bad contrast to the backround.

Can i do anything wrong controlling it or is it a faulty display?
afaik its supposed to handle all the updating internally so i would be surprised...

Miyuki:
Have it any analog adjust or voltage test points ?
This color are very sensitive to even slightest changes in voltage, current and timing

Like color passive matrix lcd screens, all pixels interact with neighboring ones and you working with minuscule charges levels
Somewhere was comparison that it is like playing chess with 5 meters long sticks

Amper:
Mh, sadly no adjustment, at least in hardware. The Supply is done by an onboard buck from 5V to 3.3V and since black works bautifully i guess thats not the issue.

I just tried heating it a bit to change the viscocity but that also doesnt seem to make a difference.

Miyuki:
Black and white is simple to work
But colors are in the middle and it must hit that exactly spot, that is tricky

Amper:
Mh, thats true, but i dont see how i could effect that?

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