Patent ID: 7416325

Claim:
A frame for fixing an optical sheet thereon, the frame comprising: a frame body comprising: a plurality of contiguous sidewalls, a supporting ledge defined at inner sides of top portions of the sidewalls for supporting the optical sheet, and at least one latching portion defined on at least one of the sidewalls, each latching portion comprising: at least one first latching slot defined at an inner surface of the top portion of the at least one sidewall adjacent to the supporting ledge; and at least one first protrusion protruding out from an outer surface of the top portion of the at least one sidewall, wherein the at least one first latching slot and the at least one first protrusion are on opposite sides of the top portion of the at least one sidewall; and at least one fastener comprising a mounting plate and a retaining plate that extends perpendicularly from a side of the mounting plate, the mounting plate defining at least one opening therein corresponding to the at least one first protrusion, the retaining plate defining at least one hooked tab corresponding to the at least one first latching slot, the at least one first protrusion being configured to be inserted into the at least one opening, and the at least one hooked tab being configured to be held in the at least one first latching slot, such that the optical sheet is fixed on the supporting ledge of the frame body.