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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@jeffmer
The 2.13" (250 x 122 pixel ) reflective display shown below connected to a Puck.js V2.1 has an ST7302 hardware driver. The display is similar to a Sharp Memory Display in that has no backlight and it permits much faster updates than Epaper displays.
It is also much cheaper than the Sharp displays - I got three from Aliexpress for less than 20 pounds (incl. postage and tax). Just search for ST7302 display.
In low power mode with frame refresh set to 4Hz, it uses on average 30 microamps. This is a versatile display, in that, in high power mode it can update at a 32Hz frame rate with current consumption still less than 1 milliamp.
The driver and example code can be found here