Patent ID: 7753563

Claim:
A display device comprising: a body member having a side member which, in plan view, conforms to a first profile; characterized by a first transparent member ( 15 ) located within, and by, the body member ( 12 ), the first transparent member ( 15 ) having a boundary ( 16 ) conforming to and lying within the first profile, a second transparent member ( 17 ) located within, and by, the body member ( 12 ), the second transparent member ( 17 ) having a boundary ( 18 ) conforming to and lying within the first profile and being spaced from the first transparent member ( 15 ) so as to provide a first plenum chamber ( 19 ) bounded by the first and second transparent body members ( 15 , 17 ) and the body member ( 12 ); a carrier ( 20 ) having a plurality of sources of light (L 1 to L 5 , LL 1 to LL 6 . . . ) located on it located by the body member ( 12 ) and spaced from the second transparent member ( 17 ) on the opposite side of the second transparent member ( 17 ) to the first plenum chamber ( 19 ) so as to provide a second plenum chamber ( 22 ) bounded by the carrier ( 20 ), the second transparent body member ( 17 ) and the body member ( 12 ); the plurality of lights being directed into the second plenum chamber ( 22 ); spacing means ( 29 ) providing for the distancing of the carrier ( 20 ) from the second transparent member ( 17 ) by a predetermined amount (P 2 ); a closure member ( 27 ) for, and secured to, the body member ( 12 ) the first plenum chamber ( 15 ) having a filling ( 25 ) of optical particles and the carrier ( 20 ) serving to load the second transparent member ( 17 ) by way of the spacing means ( 29 ) so that the filling ( 25 ) is maintained as a pressurized mass of particles; and means (H) providing for the plurality of sources of light to be connectable to at least one source of power to enable at least one of the sources to be energized.