Abstract: A mounting structure for a display panel (156) is disclosed. The mounting structure comprises upper and lower fixed extrusions (110), an upper panel mounting extrusion (152) to which the upper edge of the display panel (156) is secured and a lower mounting extrusion (122) to which the lower edge of the display panel (156) is secured. The upper mounting extrusion (152) includes a series of ribs (154.1, 154.2, 154.3) which engage with a recess (120) in the up per fixed extrusion (110). A locking extrusion (138) includes a pivot plate (150) which engages in the recess (120) of the lower fixed extrusion (110). It also has a formation (148) which engages in a socket (124) of the extrusion (122). The panel (156) is tensioned and secured by swinging the extrusion (138) downwardly about its line of contact with the lower extrusion (110). Unlocking is achieved by swinging the extrusion (138) in the opposite direction.