Thermal management system for multiple heat source devices
View Patent ↗The present disclosure provides systems and methods for forming a semiconductor device. The semiconductor device includes a substrate having a first side and a second side opposite the first side. A first heat producing element is formed on the first side of the substrate. A second heat producing element is formed on the first side of substrate co-planar with, but not touching the first heat producing element. A heat spreader is coupled to the second side of the substrate using a thermal interface material. The heat spreader includes a first and second vapor chambers. The first vapor chamber is embedded in the heat spreader substantially opposite the first heat producing element. The second vapor chamber is embedded in the heat spreader substantially opposite the second heat producing element. As an example, the first heat producing element may be a light-emitting diode (LED) and the second heat producing element may be a driver circuit for the LED.
1. A semiconductor device comprising:
a substrate having a first side and a second side opposite the first side;
a first heat producing element formed on the first side of the substrate;
a second heat producing element formed on the first side of substrate co-planar with, but not touching the first heat producing element; and
a heat spreader coupled to the second side of the substrate using a thermal interface material, the heat spreader including,
a first vapor chamber embedded in the heat spreader substantially opposite the first heat producing element, and
a second vapor chamber embedded in the heat spreader substantially opposite the second heat producing element;
wherein at least one of the first vapor chamber and the second vapor chamber is enclosed by the heat spreader.
2. The device of claim 1 , wherein the first heat producing element is a light-emitting diode (LED) and the second heat producing element is a driver circuit for the LED.
3. The device of claim 1 , wherein the thermal interface material is a silver epoxy material.
4. The device of claim 1 , further comprising a fin-type heat sink thermally coupled to the heat spreader opposite the substrate.
5. The device of claim 1 , wherein the vapor chambers each include a hermetically sealed chamber having a mesh wick and a working fluid inside.
6. The device of claim 5 , wherein the mesh wick is a layered copper mesh formed around an outer perimeter inside the hermetically sealed chamber.
7. The device of claim 1 , wherein the substrate includes a fluid-filled micro channel within the substrate, the micro channel is formed in the substrate proximate the first and second heat producing elements.
8. A light-emitting diode (LED) assembly comprising:
a substrate having a first side and a second side opposite the first side, the substrate including a fluid-filled micro channel formed within the substrate;
an LED element formed on the first side of the substrate;
a driver circuit formed on the first side of substrate co-planar with, but not touching the LED element; and
a heat spreader coupled to the second side of the substrate using a thermal interface material, the heat spreader including,
a first vapor chamber embedded in the heat spreader substantially opposite the LED element, and
a second vapor chamber embedded in the heat spreader substantially opposite the driver circuit;
wherein at least one of the first vapor chamber and the second vapor chamber contains a fluid therein.
9. The LED assembly of claim 8 further comprising a silicone lens enclosing the LED element and the driver circuit.
10. The LED assembly of claim 8 , wherein the thermal interface material is a silver epoxy material.
11. The LED assembly of claim 8 , further comprising a fin-type heat sink thermally coupled to the heat spreader opposite the substrate.
12. The LED assembly of claim 8 , wherein the vapor chambers each include a hermetically sealed chamber having a mesh wick.
13. The LED assembly of claim 12 , wherein the fluid is purified water.
14. The LED assembly of claim 8 , wherein the micro channel includes a fluid chamber formed proximate the LED element and the driver circuit.
15. A method of forming a light-emitting diode (LED) assembly, the method comprising:
providing a substrate having a first side and a second side opposite the first side;
forming an LED element on the first side of the substrate;
forming a driver circuit on the first side of substrate co-planar with, but not touching the LED element; and
coupling a heat spreader to the second side of the substrate using a thermal interface material, wherein the heat spreader includes a first vapor chamber embedded in the heat spreader substantially opposite the LED element and a second vapor chamber embedded in the heat spreader substantially opposite the driver circuit, wherein at least one of the first vapor chamber and the second vapor chamber contains a fluid therein.
16. The method of claim 15 , further comprising enclosing the LED element and the driver circuit using a silicone lens.
17. The method of claim 15 , further comprising forming a micro channel in the substrate proximate the LED element and the driver circuit, and sealing the micro channel with a heat transferring fluid therein.
18. The method of claim 15 , further comprising thermally coupling a fin-type heat sink to the heat spreader opposite the substrate.
19. The method of claim 15 , further comprising forming the vapor chambers to each include a hermetically sealed chamber having a mesh wick.
20. The method of claim 19 , further comprising supplying the working fluid as a pure water and forming the mesh wick as a layered copper mesh around an outer perimeter before hermetically sealing the chamber.