GDEP073E01 (Spectra 6 color E-Ink) - Partial update supported by GxEPD2?

[gforums]

Hi there,

I have a working setup with Arduino, ESP32 and a GDEP073E01 color e-Ink display.

When I try a partial update, the screen will be updated completely and the previous content is removed.

This is how my code snipped looks like:

 int16_t x = 100;  //area to be updated
 int16_t y = 400;
 int16_t w = 200;
 int16_t h = 30;


  display.setPartialWindow(x, y, w, h);
  display.firstPage();
  do {
    display.fillRect(x, y, w, h, GxEPD_WHITE); // fill white to remove old text
    display.setFont(&FreeMonoBold12pt7b);
    display.setTextColor(GxEPD_BLUE);
    display.setCursor(x, y + 1); // position for text
    display.print("movement mode active");
    movement = 1;
      }
  } while (display.nextPage());

I have a "hello world" text printed @100,100 before and this will be removed by above procedure

should partial update be supported this way?
Anything I can try such as some sample code or changes within my code?

Thanks a lot!
Best,
Christian

[ZinggJM]

Hi Christian

The controllers of 6-color or 7-color e-paper displays have neither partial window addressing capability, nor partial window refresh, as far as I know. Therefore GxEPD2 can't provide partial refresh on these displays.

[ZinggJM]

It looks like Good Display has "found" the "Partial Window" command and added a new example in January 2025.

[smarthomeagentur]

Hi, the solution is not from good display. it also works with other spectra6 7 inch screens from different suppliers . it seems to be a general software feature in the spectra6 displays but with zero Dokumentation. we tried the sample of good display with 4 types of revisions of the display - all worked

[gforums]

Great to hear @smarthomeagentur ,
I didn't have time to test things myself further. Would you mind sharing some concrete sample code so I could test this as well (for Arduino, either using this lib or another...?)

That would be much appreciated!
Thanks, danke,

Christian

[smarthomeagentur]

@gforums https://www.good-display.com/companyfile/1908.html I didnt implement it in platform.io nor in your lib so far but this sample worked out of the box for me
Edit: https://photos.app.goo.gl/DWNDwvXDW4LGNNEd9 this is a sample video from us

[gforums]

Thanks, will give it a further try as soon as I have some spare time. Cheers!

[ZinggJM]

Version 1.6.8

• added methods writeImageToPrevious and writeImagePartToPrevious to b/w driver classes
• added partial update support to GDEP073E01
• added partial window addressing to GDEY073D46, partial refresh not usable

My other 6 or 7 color displays don't know the 0x83 command, it is simply ignored.