Heat dissipative and lightweight optical elements having increased strength and stiffness
AssigneeMeta Platforms Technologies, LLC
InventorsChristopher Stipe, Andrew John Ouderkirk, Eugene Cho, Sheng Ye, Arman Boromand, Alex Ockfen, Nagi Hosni Elabbasi
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Abstract
A polymer thin film includes polyethylene having a weight average molecular weight of at least approximately 500,000 g/mol, where the thin film is characterized by transparency within the visible spectrum of at least approximately 80%, bulk haze of less than approximately 5%, and an in-plane elastic modulus of at least approximately 10 GPa. The polymer thin film may be thermally conductive and may be incorporated into an optical element and configured to dissipate heat, such as from a light-emitting device.
Claims15
A multilayer polymer thin film comprising:
- a first polyethylene thin film having a first in-plane orientation of crystalline axes and a weight average molecular weight of at least approximately 500,000 g/mol;
- and
- a second polyethylene thin film having a second in-plane orientation of crystalline axes and a weight average molecular weight of at least approximately 500,000 g/mol, wherein the multilayer polymer thin film comprises:
- transparency within the visible spectrum of at least approximately 80%;
- bulk haze of less than approximately 5%;
- and
- an in-plane elastic modulus of at least approximately 10 GPa.
A multilayer thin film comprising:
- a first crystalline polymer layer and a second crystalline polymer layer, the first crystalline polymer layer having a first in-plane orientation of crystalline axes and the second crystalline polymer layer having a second in-plane orientation of crystalline axes such that the crystalline axes of the first and second crystalline polymer layers are rotationally misoriented in-plane by an angle (θ), where 0<θ≤90°, each of the first and second crystalline polymer layers comprise a weight average molecular weight of at least approximately 500,000 g/mol and the multilayer thin film comprises at least two attributes (i-iv) selected from the group consisting of:
- (i) transparency within a visible spectrum of at least approximately 80%;
- (ii) bulk haze of less than approximately 5%;
- (iii) an in-plane elastic modulus of at least approximately 10 GPa;
- and
- (iv) an in-plane thermal conductivity of at least approximately 5 W/mK.
Dependencies are inferred from the claim text.