Embodiments of the invention disclose a pixel unit and an array substrate of an LCD device with an FFS mode; the pixel unit includes a pixel electrode and a common electrode insulated from each other, the pixel electrode includes at least two branch electrodes arranged in parallel and an end electrode connecting to ends of the branch electrodes; the branch electrode includes a body and an inclined connection part, the inclined connection part is connected between an end of the body and the end electrode, and extends in a direction different from extension direction of the body; at least one of the branch electrodes includes a protrusion at an end of the body; the protrusion is arranged opposite to the end electrode along the extension direction of the body. Embodiments of the invention can suppress the DLS phenomenon at the edge of the pixel unit, thereby improving display performance.