This is a 2.13-inch E-Ink display HAT that has a Raspberry Pi 40PIN GPIO extension header. It is compatible with Raspberry Pi series boards and Jetson Nano. It has a resolution of 250x122 and displays in black and white. The display has an embedded controller and communicates via SPI interface. It also supports partial refresh.
There is no backlight, so the display can keep showing the last content for a long time even when powered down. It has ultra low power consumption and only requires power for refreshing.
The SPI interface allows for connection with controller boards such as Arduino/STM32, etc. It also has an onboard voltage translator that is compatible with 3.3V / 5V MCUs.
Please note that the driver board is Rev2.1 (Version 2.1), which is independent of the screen version. Currently, only Rev2.1 (Version 2.1) is available for the driver board. The QC label V4 is for the screen version and is currently being shipped.
The product comes with online development resources and a manual. The manual includes the driver board circuit diagram and examples for Raspberry Pi, Jetson Nano, Arduino, and STM32. You can find more information at bit.ly/3hZh77i.