GxEPD2: Good Display 4.2" monochrome products all discontinued?

Other Hardware Displays
1

It appears that all of the following 4.2" displays that are supported by GxEPD2 have been discontinued and are no longer available:

Would the GDEY042T81 work on GxEPD2 using the GDEY042T91 configuration? They look pretty similar. Are there other 4.2" monochrome boards that support partial refresh that are still available for purchase?

I'm happy to buy some displays and send them to someone if that would help enable support in GxEPD2.

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Yes, might be. If you use the panel link in GxEPD2_420_GDEY042T91.h you get to the page 4.2 inch e-ink display high rate refresh 400x300 SPI, GDEY042T81.

The name GDEY042T91 may have been either preliminary, or a typo.

There seem to be two versions:

4.2 inch e-ink display high rate refresh 400x300 SPI, GDEY042T81
This is a monochrome e-ink display, 4.2 inch, 400x300 resolution, SSD1683, SPI interface, and the electronic paper screen supports partial refresh and 4 grayscale.

4.2 inch e-ink display SSD1683 support partial, fast refresh, GDEQ042T81
This is a 4.2 inch e-ink display SSD1683 with 400x300 resolution, SPI interface, and the e-ink screen supports 3s full refresh, 0.42s partial refresh and 1.5s fast refresh.

It is unclear to me, if they just have different wavetables in OTP, or if the panel fluids are optimized for different uses.

The GxEPD2 driver class code for GDEY042T91 supports the 1.5s fast refresh feature of the GDEQ042T81. So it might have been a preliminary name for GDEQ042T81.
You may need to disable this feature in the class header:

    static const bool useFastFullUpdate = true; // set false for extended (low) temperature range

by setting it to false.

Seem still in presale state. I had got a free sample.

Thank you for having pointed me to these updates on their web-page. I gave up on sporadically looking for updates, because the displays I am interested in tend to stay in presale state almost forever.
-jz-

3

I can confirm that GxEPD2_Example works just fine for the GDEY042T81 using the default GxEPD2_420_GDEY042T91 driver class.

Thank you!
Mike

2 Likes
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@emmby, thank you for the confirmation!

I have also received the GDEY042T81 I ordered.
It also works with the GxEPD2_420_GDEY042T91 driver class.
The panel has a sticker on the backside 042BN-T81 202308201.

The panel I had received in March has the same sticker with 042BN-T81 2023021701.
All documents and code-zip-files I downloaded on 10.03.23 are named GDEY042T91,
e.g. A32-GDEY042T91-FP.rar containing A32-GDEY042T91-FP-20221013.

So GDEY042T91 and GDEY042T81 are the same, and GDEY042T91 has been renamed to GDEY042T81.

I will rename the driver class in the next release of GxEPD2.
-jz-

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