Guys please look in forums before asking questions, i have been going around on the forums for a few minutes now and alot of people have this problem...
its probably a graphics to high thing where you have to high graphics, to fix it look at this thread http://answers.ea.com/t5/Battlefield-4/BF4-graphics-issue/m-p/1632127#U1632127
http://answers.ea.com/t5/Battlefield-4/BF4-graphics-issue/m-p/1632127#U1632127
http://answers.ea.com/t5/Battlefield-4/BF4-graphics-issue/m-p/1632127#U1632127
if this doesnt work its because your PC doesnt match the requirments or that you have another issue
and update your driver,
if you have NVIDIA Geforce plz download
http://www.geforce.com/geforce-experience/download
and update your driver
