28084 ePaper Black Screen?
in Accessories
Why does the updateDisplay(ePaper) call make the screen go black then white again? Because it looks like the text is already written to the white screen before the black screen appears.
Comments
Mike
The code just tells it to update, and then the on board chip/logic of the display does all the flashing and whatnot to update the display.
The IL3820 is being updated without the flashing. I wonder if the display has different refresh modes.
// Update display
il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, IL3820_DISPLAY_UPDATE_2, 0);
il3820_spiWrite(mask_cs, mask_sdi, mask_clk, mask_dc, 0xC4, 1);
I have tried several different modes and code and I still see flashing. Need better documentation on the chip used to drive this ePaper display.
Mike
You can see it does do the black then white flashing when doing full updates.
I don't remember seeing any partial update functionality in the SimpleIDE IL3820 library. I wanted to use the 28084 similar to the way it's being used in the first part of the video (above). Updating variables in realtime. You can see in the video that there is a slight flicker between each updates. Also, I'd like to find that LED numbering capability, being used in the upper right hand corner of the display.
I ran across an issue on GitHub about the IL3820 flicker. It had something to do with using a different LUT for better performance and less flicker.
https://github.com/olikraus/u8g2/issues/347 "Fast and nearly flicker free LUT"
It's about halfway down the page. I'm still trying to understand the function of the waveform produced by the LUT.