Hi
I have a Inky Impression (7 colour ePaper/eInk/EPD) screen working on a Raspberry Pi Zero 2 W
In the product page noted “It takes approximately 15 seconds to refresh the display.”
however mine takes about double(29secods.)
Do I miss bus speed settings or configuration for normal speed refresh?
Any infomation is helpful, Thank you!
Reference - It seems around 15 seconds to refresh.
What I did
1.Fresh install the latest Raspberry Pi OS(bullseye)
2.Install Python library with examples - “curl https://get.pimoroni.com/inky | bash”
3.Reboot and run the example script.
(Update)
Tested with older Raspberry Pi OS(Buster) with Raspberry Pi 4, I’ve got the same result.
I have 2 of this product and both panel takes 30 secods of refresh time.
I guess something(hardware or firmware??) has been changed after the product released. I think current version of this panel might need to take 30s refresh time.
It seems older version of this prodcut (pcb with notch) might be able to 15 seconds refresh. Also I notice refreshing pattern is not the same as mine.
Panel is great but I kind of disappointed the double refreshing time :(
Also I think PIMORONI is already knowing it, but they might be too lazy to update product description.
If they really belive the panel could refresh within15 seconds, this change is really weired to me.
It seems older version of this prodcut (pcb with notch) might be able to 15 seconds refresh. Also I notice refreshing pattern is not the same as mine.
Anecdotally, I have one of the older boards with a notch in the PCB, and while I haven’t timed it, I reckon ~15 seconds is about right, and I’d agree that it has a different refresh pattern to yours.
Yes, the refresh on recent Inky Impressions takes around 30 seconds - this is because the controller in the newer displays has a built in ‘clear’ phase which cannot be skipped by sneaky software means. I think with earlier displays we had more manual control over the clear/refresh cycle, so were able to improve the refresh time.
Looks like this was updated on the page for the 4" variant but not on the 5.7" variant - sorry about that, I’ve changed it now. If the extra refresh time makes it unusable for your application, please drop a message to support (with a link to this thread) and we’ll do our best to help.
