Fluidic thermal management article and method
View Patent ↗An article includes a display layer having an outward facing surface and an inward facing surface. The display layer includes a light-emitting device that generates heat and light during use. A thermal transport layer may be secured to the display layer. The thermal transport layer may include a microfluidic layer including a coolant that can transport heat generated by the light-emitting device away from the light-emitting device. An article includes a display structure having a height, a width, and a thickness that define a volume. The display structure can include components that emit light to generate a three-dimensional image within the volume. The display structure includes a stack. The display structure also includes a thermal dissipation layer in contact with the sheet or stack that can transport generated heat from the sheet or stack to a heat absorbing structure.
1. An article, comprising:
a display layer having an outward facing surface and an inward facing surface, and the display layer comprising a light-emitting device that generates heat and light during use; and
a thermal transport layer secured to the display layer wherein the thermal transport layer is a microfluidic layer comprising a coolant that can transport heat generated by the light-emitting device away from the light-emitting device.
2. The article as defined in claim 1 , wherein the thermal transport layer is secured to the inward facing surface, the outward facing surface or to both the inward and the outward facing surfaces of the display layer.
3. The article as defined in claim 1 , wherein the thermal transport layer has a refractive index and the display layer has a refractive index and the refractive index differential between the thermal transport layer and the display layer is less than 0.1.
4. The article as defined in claim 1 , wherein the thermal transport layer has a refractive index and the display layer has a refractive index and the refractive index of the thermal transport layer is equal to the refractive index of the display layer.
5. The article as defined in claim 1 , wherein the thermal transport layer comprises a polymeric material.
6. The article as defined in claim 1 , wherein the thermal transport layer comprises a silicon-containing material.
7. The article as defined in claim 1 , wherein the thermal transport layer is light transmissive and is located between the display layer and a viewer of the display layer.
8. The article as defined in claim 1 , wherein the thermal transport layer has a thickness that is in a range of from about 1 micrometer to about 1000 micrometers.
9. The article as defined in claim 1 , wherein the thermal transport layer has a flexural strength in a range of from about 10 gigaPascal to about 400 gigaPascal.
10. The article as defined in claim 1 , wherein the coolant can absorb heat from the display layer while in the channel.
11. The article as defined in claim 1 , wherein the coolant comprises a fluid, and the fluid is a liquid having a viscosity in a range of from about 1×10 −3 Pascal second to about 10×10 −3 Pascal second.
12. The article as defined in claim 1 , wherein the thermal transport layer has a refractive index and the coolant has a refractive index, and the refractive index differential between the thermal transport layer and the coolant is less than about 0.1 at a defined operation temperature.
13. The article as defined in claim 1 , wherein the coolant layer has a refractive index and the display layer has a refractive index and the refractive index differential between the coolant and the display layer is less than 0.1.
14. The article as defined in claim 1 , wherein the channel has a length sufficient to traverse at least about 80 percent of an area defined by the display layer.
15. The article as defined in claim 1 , wherein the channel has an outer diameter of about 0.2 micrometers to about 2 micrometers and an inner diameter in a range of from about 0.1 micrometers to about 1 micrometers.
16. The article as defined in claim 15 , wherein the inner diameter and the outer diameter of the channel are greater in a first zone of the display layer that generates relatively more heat than the corresponding diameters in another zone of the display layer that generates relatively less heat.
17. The article as defined in claim 1 , wherein the channel is entirely sandwiched between the display layers.
18. The article as defined in claim 1 , wherein the channel has about 2 to about 2000 turns to loop back as it traverses the display layer area.
19. The article as defined in claim 1 , wherein the channel has a pitch in a range of from about 5 millimeter to about 50 millimeter from one loop to another loop based on the size of the display layer.
20. The article as defined in claim 1 , wherein the channel is one of a plurality of channels.
21. The article as defined in claim 20 , wherein the number of channels of the plurality of channels is greater in a first zone of the display layer that generates relatively more heat than the number of channels in another zone of the display layer that generates relatively less heat.
22. The article as defined in claim 21 , wherein the zone of the display layer that generates relatively more heat than another zone of the display that generates relatively more heat is in the middle of the display layer.
23. The article as defined in claim 1 , wherein the light-emitting diodes deeper in the stack are subject to relatively higher voltage potential and generate more heat than light-emitting diodes that are not as deep in the stack.
24. The article as defined in claim 1 , wherein the channel flows around a peripheral edge of the display layer, and coolant dissipates carried heat at the peripheral edge.
25. The article as defined in claim 24 , wherein there is a plurality of heat absorbing structures around the peripheral edge of the display layer in thermal communication with the coolant.
26. The article as defined in claim 25 , wherein the heat absorbing structure comprises a synthetic jet, a heat exchanger, a heat spreader, a heat sink, a radiator, one or more Peltier devices, or a heat pipe.
27. The article as defined in claim 1 , further comprising a heat dissipating structure in thermal communication with the coolant, and a heat exchanger spaced at a distance from the display layer.
28. The article as defined in claim 27 , wherein the thermal transport layer is in thermal communication with the heat exchanger via a highly thermally conductive material such as metalized sheets, conductive glass coating, and porous structural carbon films.
29. The article as defined in claim 1 , wherein the display layer is part of a stack of display layers.
30. The article as defined in claim 29 , wherein the stack is a three-dimensional display stack.
31. The article as defined in claim 30 , wherein there is at least two thermal transport layers for every one display layer of the stack.
32. The article as defined in claim 1 , wherein the light-emitting device is an inorganic light-emitting device or a light-emitting nano-wire based device.
33. The article as defined in claim 1 , wherein the light-emitting device is an organic light-emitting device.
34. The article as defined in claim 1 , wherein the display layer further comprises a reversibly opacifying layer.
35. The article as defined in claim 34 , wherein the opacifying layer responds to an electrical signal by switching to or from a light transmissive state from or to a light blocking or light absorbing state.
36. The article as defined in claim 34 , wherein the opacifying layer is disposed on a surface of the display layer opposite to a surface of the display layer that emits light.