Abstract: An exemplary a display apparatus (2) includes a display panel (21) and a height adjusting device (25). The height adjusting device includes a base (26), a supporting member (27), a locking unit (30), and an elastic member (28). The display panel is fixed to the locking unit. The supporting member is fixed on the base. The supporting member includes two generally vertical friction grooves (2723, 2725). A depth of one of the friction grooves decreases with increasing height above the base, and a depth of the other friction groove increases with increasing height above the base. The locking unit is accommodated in the supporting member. The locking unit includes two sliders (33, 35) corresponding to the two friction grooves of the supporting member respectively. One of the sliders abuts a corresponding one of the friction grooves. The elastic member spans between the locking unit and the base.

Abstract: An exemplary flat panel display (200) includes a display body (21) and a height adjusting member (23). The height adjusting member includes a supporting member (25) and a base (26). The supporting member includes a slider (30) and a sidewall (272). The slider is attached to the display body, and the slider abuts against but is slidable up and down along the sidewall. The slider is configured to be adjustable to vary an amount of friction between the slider and the sidewall such that a height of the display body is adjustable by applying external force to the display body and moving the display body to a new height.

Abstract: A flat display device (2) has a foldable base (25). The flat display device includes a flat panel (21) pivoted to a base by a hinge assembly (23). The panel is capable of rotating with respect to the base between a position and a second position. A third position of the panel with respect to the base is intermediate between the first position and the second position. A first friction force provided by the hinge assembly when the panel rotates between the first position and the third position is smaller than a second friction force provided by the hinge assembly when the panel rotates between the third position and the second position.

Abstract: An exemplary packing box (2) includes a receptacle portion (21) and at least one buffer portion (23). The receptacle portion includes a plurality of side walls (213, 215, 217) and a base (211) perpendicular to thereof. The side walls and the base cooperatively define a receiving space. The at least one buffer portion extends from at least one of the side walls. The at least one buffer portion is located in the receiving space and including a first supporting member (213b) and at least one buffer layer (233).