finally i purchased an usb displaylink adapter with a fast decision. i supposed its an gfx chip which can communicates with mainboard via usb port.

 ..But it's not
 It creates a virtual desktop on your system by using software and captures realtime video from it. then device receives this video with 50~250ms delay. i don't sure that's applicable in commercial industry but it's terrible idea.

 Suffer begins
 Maybe their certified products working without any trouble but i did my second mistake by purchasing an unknown chinese brand with high price. its getting warm on first usage and resets itself due to overheating. and i decided to use it by replacing heatsinks instead of refund. this time heatsink melts its plastic cover, and i installed a small fan into it. wtf. this is madness.

 The Cure
 ofcourse i didn't use it due to its noise, i researched more and finally found the Sapphire HD6450 Flex edition it uses an unique technology called "Flex" to get three displays same time. that's exactly what i need but its obsolete a little bit and hard to find in local market. then found on someone's ebay store later.

 after the two weeks, i received item, installed it to my mini-itx case and sent that usb-crap to trash. if you're planning a similar screen setup, stay away from displaylink devices.