Latest OLED Watch (Isn't OLED)

The OLED watch project started when I saw some small OLED displays on ebay and thought 'What can I do with that?'. The watches followed, but there was always the problem of the power consumption of the display. I manage about 400 hours of use from a rechargeable 2032 battery, more from a non-rechargeable (the capacity is higher).
So, I had a look around and found a lower power display, one of the Sharp memory LCDs. These are very low power LCD displays.

A redesign of the hardware to drive the LCD was needed as the display isn't I2C, it's a serial bit stream. The hard part of using this LCD was finding a way to solder the 0.5mm pitch connector on to a PCB. Milling that connector was challenging as well. In the end I got a new soldering station so I have hot air. I also have a stencil for solder paste application. As well as milled PCBs I had a few made up by Dirty PCBs so I have a full solution if I need it.

The code was adjusted and the display was up and running.

The PCB is reversed due to the layout of the display connection. It's a cleaner look, but less interesting. I may revisit that in a later iteration.
The battery has also been reversed.

The overall watch is as thin as the OLED one and is very wearable.

So far the battery life seems to be far in excess of the OLED watch. The display update takes 20ms and to get power consumption to an absolute minimum the display is updated every 5 minutes. I'll see what real world battery life I get from this and then decide on what update rate I'll settle on.