(19) United States
(12) Patent Application Publication (io) Pub. No.: US 2001/0037591 Al
Nicholson et al. (43) Pub. Date: Nov. 8,2001
In a prelerred embodiment ol the invention, an outdoor sign has a plurality ol display modules, each hermetically sealed, for forming a hermetically sealed large sign screen. Each module is prelerably formed ol a lightweight plastic enclosure with an open interior containing circuitry and light emitting diodes. Means for minimizing deflection ol the front panel are incorporated into the enclosure. One such means includes a single restrictive vent for pressure equalization to minimize deflection ol the lace portion. The means also includes an internal diaphragm to maintain the integrity ol the hermetic seal. A leature and advantage ol the invention is that moisture and other containments are effectively precluded from entry into the chamber containing the circuitry and LED's ol the display sign.