Today I'm going to teardown a pair of Oaxis InkCase thingies. It is a protective case for your phone which has a second screen and the screen is eInk type screen, black and white. This type of screens used for eBook readers like Amazon Kindle. So in theory this "case" should work much longer than your phone on it's battery. A case connects to your phone through Bluetooth 2.0 for N2 and through Bluetooth BLE for i5.
I received these units for beta test in Jan 2014 and found them unusable at that time. Especially N2 case which was chewing batteries like crazy, it would not hold a day without recharging. Also often loosing connection without being able to reconnect without disabling and re-enabling bluetooth first. So I wrote it all to the guys at Oaxis and put units away.
A little tip on how it works. It's very simple. Phone just sends a single image to the case through bluetooth, that's all. All the image compositing done in the phone's app.
Now I see they are released new InkCase Plus model which is designed to fit to almost any android phone.
Enough waffle, let's tear it down starting with N2 model.
Next i5 model.
Ok, the circuit is completely different to N2. This one has a Rockchip RK2818 SoC which used in low-end android phones. Also to note, i5 model has only one single button.