Substrate structure

A substrate structure that carries a plurality of heat generating elements, the substrate structure comprising:

• a board, having an upper surface;
• a patterned metal layer, disposed on the board, and comprising a first electrode, a second electrode, a plurality of first pads and a plurality of second pads, wherein the first electrode does not contact the second electrode, the first pads and the second pads are alternately disposed on the upper surface in parallel, parts of the first pads are electrically connected to the first electrode, and parts of the second pads are electrically connected to the second electrode, the other parts of the first pads and the other parts of second pads are electrically connected to each other, respectively, each of the first pads and the adjacent second pad define a device bonding area, the heat generating elements are respectively disposed in the device bonding areas, and there is a plurality of trenches between the adjacent two device bonding areas;
• and
• a plurality of heat dissipating channels, disposed in the trenches;
• wherein the heat dissipating channels comprise a plurality of first heat dissipating channels extended along a first axial line and a plurality of second heat dissipating channels extended along a second axial line, the first axial line is perpendicular to the second axial line, and the first heat dissipating channels are partially overlapped or non-overlapped to the second heat dissipating channels.