Abstract: Disclosed is a lamp assembly that provides various beam radiation pattern to correspond to various driving environments of a vehicle. The lamp assembly includes a lamp, a lamp shield driving device partially blocking light emitted from the lamp to form a beam radiation pattern, a lens forward focusing the blocked light, and a housing receiving the lamp and the lamp shield driving device. The lamp shield driving device includes a cylindrical rotary shield, a mover, and a driving unit. The cylindrical rotary shield includes one or more shield protrusions and a screw cam on a peripheral surface thereof, each of the shield protrusions has a predetermined cutoff pattern, and a screw cam has a predetermined pitch. The mover includes a guide protrusion on an upper surface thereof, and the guide protrusion is engaged with the screw cam. The driving unit linearly moves the mover in an axial direction of the cylindrical rotary shield.