Memory LCD display is one of the display technology that is used in the smart watch and other embedded products. You can also use this display for your DIY projects as you can easily buy the module from some of the online stores.
EPSON's semiconductor division developed the microcontroller "S1C31D01" that has the built-in memory LCD display controller and the power supply circuits.
Their product family line-up can be seen here.
Their website describes as below.
"Epson's low-power microcontrollers, which have built-in Flash memory, are designed to be embedded in mobile devices. In October 2015 Epson began shipping samples of the S1C31W74, the company's first product in the S1C31 series of microcontrollers with an ARM® Cortex®-M0+ processor. The S1C31D01 is the second product in the series. The biggest features of the S1C31D01 are that the memory LCD controller and the power supply IC for it are integrated on this single-chip solution."
ARM and Cortex are registered trademarks of ARM Limited (or its subsidiaries) in the EU and other countries. All rights reserved.
As mentioned above, the chip supports a new memory LCD controller, a power supply IC for the memory LCD that can output two voltages of the developer's choice, and a 6-bit parallel interface. As a results, these features eliminate the need for the external components and interface software development that can save developer's time and effort while also reducing the PCB area of the necessary circuits.
Recently, they also announced that they start the support and free of charge distribution of the emWin embedded GUI tool for this microcontroller S1C31D01.
emWin is the GUI (graphical user interface) tool designed by SEGGER to provide an efficient, processor and display controller independent GUI for any application with a graphical display.
According to their website, the emWin library for the emWin library for Epson's S1C31D01 series microcontrollers supports the following features.
The evaluation board is available from here, but I do not think you can buy online at this moment...
I personally think it would be nice to have MCU only small module to provide more design flexibility during the proto phase and also would be nice to have a platform for DIY users.