The difference between HD，QHD，qHD,FHD screen of Smart door lock
You have ever seen that the decscription or the advertisement about the screen of the smart door lock or the mobilephone. What do them means? and which is better?
HD screen means High Definition and usualy the resolution is 1280*720px.
FHD meansFull High Definition,1920*1080 px
QHD means Quad HD,2560*1440 px
qHD means Quater high Definition，which is the quater of the full high definition, 960*540px
When you purchase the mobilephone and the smart door lock and the screen definition is not the only element of the screen. the quanlity of the screen also relative with the brightness, visual angle,contrast ratio,dynamic response,color standard and so on.
