A display support device includes a connecting member and a lower tube. The connecting member is adapted to be mounted on a rear surface of a flat display, and includes an upper tube. The lower tube is disposed below the upper tube. One of the upper and lower tubes has an internally threaded portion, and the other of the upper and lower tubes has an externally threaded portion engaging the internally threaded portion to allow for rotation and therefore movement of the lower tube relative to the upper tube, which results in a change to the total length of the upper and lower tubes.