Patent ID: 8477420

Claim:
A kit comprising: a plurality of screen sections, each screen section having a viewing side having a plurality of optical microstructures, a back side generally parallel to the viewing side, a seaming edge positioned between and transverse to the viewing side and the back side, and a beam on the back side that is disposed parallel to a respective seaming edge, the beam having a surface disposed generally transverse to the back side of the screen section and a cavity-forming portion that is configured to define a portion of a cavity in cooperation with the cavity forming portion of another screen section such that the cooperating cavity-forming portions sealingly surround the cavity; and a channel having an end portion configured to engage the generally transverse surfaces of a pair of the beams positioned adjacent and parallel to each other and main portion of the channel that narrows to a configuration that engages the pair of the beams with each other to sealingly surround the cavity.