I have been learning a lot about eink, and eink controllers, and eink waveforms. The K1 uses this eink controller:
https://web.archive.org/web/20100613..._datasheet.pdf
And this is excellent information on eink controllers (specifically the one used in the K3, in this case):
http://wenku.baidu.com/view/187d5395...5f465e245.html
(It seems to be "copy protected" and images only load on demand, but do not save or print. If you cannot view all 38 pages in your browser, try a different browser).