Light-Emitting Module Heat Dissipation Member Design

The heat dissipation member is constructed as a composite material comprising a graphite member and a metal member. The graphite member provides high thermal conductivity in the vertical direction (along the stacking direction of graphene sheets) to efficiently conduct heat away from the light-emitting elements, while the metal member provides high thermal conductivity in the horizontal direction to distribute heat laterally. This composite structure enables effective heat dissipation in multiple directions simultaneously, resolving the contradiction between high-density mounting (which increases heat generation) and reliability (which requires effective heat management).

The heat dissipation member acts as an intermediary component between the first substrate and the second substrate. It is bonded to both substrates using sintered metal layers, creating a thermal management interface that accommodates differences in thermal expansion coefficients. The graphite member's unique thermal properties and the metal member's ductility allow this intermediary structure to absorb thermal stresses, preventing direct stress transmission between the substrates with different expansion characteristics, thus maintaining both integration and reliability.

The heat dissipation member introduces a vertical dimension to heat dissipation through the graphite member's stacking structure. The graphene sheets are stacked in layers with high thermal conductivity along the stacking direction, creating a three-dimensional heat conduction pathway. This vertical heat dissipation path complements the horizontal heat distribution provided by the metal member, achieving efficient heat management in multiple dimensions without requiring an overly complex structure.