The invention relates to a
printed circuit board (PCB) with a heat dissipating structure. The PCB comprises a conducting layer and a PCB carrier layer, wherein the PCB carrier layer is a porous
heat conducting layer;
heat conducting liquid or a
solid-
liquid phase change
heat conducting material is injected into holes of the porous heat conducting layer; the conducting layer is arranged on a first surface of the porous heat conducting layer; and a second surface of the porous heat conducting layer is a contact interface with external media. In the invention, the carrier layer of the PCB is a porous heat conducting layer which is made of a porous material with high
thermal conductivity, heat conducting liquid such as heat conducting ink or the
solid-
liquid phase change heat conducting material permeates into the holes of the porous heat conducting layer; when the PCB is heated, the heat conducting ink is separated out of the porous material because the expansion coefficient of the porous material is inconsistent with that of the heat conducting ink, and the separated heat conducting ink fills air gaps between the contact interface and the external medium in the contact interface of the PCB via capillary phenomenon, so that
heat resistance between a light-emitting
diode (LED) and the contact interface is reduced greatly and the
thermal conductivity of the PCB is enhanced; moreover, the PCB has low cost, simple structure and easy installation.