Cannot use word on the USB screen
 

macOS 10.12.4
iMac 27'', late 2013

I just join the family of usb to hdmi. I have had two screen and use DisplayLink to add another rotated screen specially for writing.
I installed the DisplayLink USB Graphics Software for Mac OS X v3.0, which released in Feb 3 2017.
The delay can be tolerated. But I cannot even use Microsoft Word. Anyone knows how to solve it?

I attached the screenshot for an empty Word file, which shows very unusable.

Thanks a lot!