search

vroland / epdiy

EPDiy is a driver board for affordable e-Paper (or E-ink) displays.
https://vroland.github.io/epdiy-hardware/
GNU Lesser General Public License v3.0
1.25k stars 178 forks source link

Why epaper has rendering afterimage on MODE_DU mode? #210

Closed lanistor closed 1 year ago

lanistor commented 1 year ago

On MODE_GC16 mode, i can understand the afterimage, for particle indeterminate position. But why MODE_DU mode still have afterimage? and it's serious.

I'm using epd_hl_update_area to call epdiy with lvgl.

martinberlin commented 1 year ago

LVGL usually uses a lot of small partial updates unless you configure it in a special way. Using lots of partials sometimes leave a ghost image. It's hard to get rid of it unless you use a full refresh. Ebook readers use a completely different controller / commercial Waveform that partly solves this making it look better. But still from time to time, they do a full refresh of the screen, since they are aware of the ghosting issue.