Just to provide update: I tried: 9.17.10.3347 (05 Dec 2013) from Lenovo: http://support.lenovo.com/en_CA/research/hints-or-tips/detail.page?&DocID=HT063271
The blurring edge has been improved at least on my external display. Hard to tell on built-in display. But there definitely has been improvement. So someone had worked on the issue. To give credit.
Thanks,