Abstract: A heat-dissipating device used in a projection display apparatus with an air outlet includes a fence module, at least one resilient member, and a shape memory alloy module. The fence module is disposed at the air outlet and includes at least one guiding plate with a pivot. The resilient member exerts a first force on the guiding plate to enable the guiding plate to rotate on the pivot, and the shape memory alloy module deforms when heated to exert a second force on the guiding plate to enable the guiding plate to rotate on the pivot.

Abstract: A light valve device includes a light valve disposed adjacent to a circuit board, and a heat-dissipating structure including a heat-dissipating main body and a heat-dissipating block. The heat-dissipating main body is disposed opposite to the light valve, and is formed with a groove defined by a first contacting surface and two engaging surfaces. The first contacting surface extends in a longitudinal direction perpendicular to the vertical direction and has two opposite longitudinal edges. The engaging surfaces respectively extend from the longitudinal edges and define an open side of the groove opposite to the first contacting surface in the vertical direction. The open side has a width in the transverse direction smaller than that of the first contacting surface. An engaging portion of the heat-dissipating block is disposed in the groove so that a second contacting surface is in contact with the first contacting surface.

Abstract: A heat-dissipating fin of a heat sink for improving thermal conduction is disclosed. The heat sink has a base plate and a plurality of heat-dissipating fins. The base plate includes a first surface contacting with a heat source, and a second surface having a plurality of grooves orderly formed on the second surface. The heat dissipating fin of the heat sink has the feature that the thickness of the heat-dissipating fin is not uniform, and the thickness of a bottom surface of the heat-dissipating fin facing the groove is greater than the other portions of the heat-dissipating fin.

Abstract: A cooling fin structure is constructed by a thermally conductive sheet bent to form a heat radiation part and a welding part. The welding part is formed with a vacant region, which is defined by notches, openings or a slot, and the thermally conductive sheet is welded to a substrate through the welding part.