LED lighting device with cured structural support
A light emitting diode (LED) lighting device includes at least one LED assembly comprising a substrate and two or more LEDs configured to generate light spaced apart along the substrate. A cured structural coating is disposed on at least a portion of the LED assembly, wherein the cured structural coating is configured to maintain the LED assembly in a predetermined shape. The substrate of the LED assembly may comprise an elongated and/or flexible substrate.
1. A light emitting diode (LED) lighting device, comprising:
at least one LED assembly comprising a substrate and two or more LEDs configured to generate light spaced apart along the substrate, the LED assembly having a width and a length that is greater than the width;
a cured structural coating that coats at least a portion of the LED assembly, wherein the cured structural coating is configured to be applied to the LED assembly before the LED assembly is shaped into a predetermined rigid shape, the cured structural coating configured to maintain the LED assembly in the predetermined shape defining an open central volume, wherein a width of the structural coating is about equal to the width of the LED assembly, the cured structural coating comprising fins that extend at least one of outside the open central volume and inside the open central volume; and
openings between neighboring segments of the LED assembly, the openings extending into the open central volume and allowing airflow between the neighboring segments from outside the open central volume into the open central volume.
2. The LED lighting device of claim 1 , wherein the predetermined shape is a spiral.
3. The LED lighting device of claim 1 , wherein the at least one LED assembly comprises only one continuous LED assembly.
4. The LED lighting device of claim 1 , wherein the substrate has a first major surface and an opposing a second major surface and each of the LEDs has a light emitting surface or edge that is substantially perpendicular to the first major surface or the second major surface of the substrate.
5. The LED lighting device of claim 1 , wherein the substrate has a first major surface and an opposing second major surface and each of the LEDs has a light emitting surface or edge that is substantially parallel to the first major surface or the second major surface of the substrate.
6. The LED lighting device of claim 1 , wherein the substrate has a first major surface and a second major surface and the LEDs are disposed on at least one of the first major surface and the second major surface.
7. The LED lighting device of claim 1 , wherein the substrate comprises a flexible circuit board having conductors that electrically connect the LEDs and the LEDs are discrete surface mount components.
8. The LED lighting device of claim 1 , wherein the LEDs comprise micro LEDs formed together as an integrated circuit.
9. The LED lighting device of claim 1 , wherein the cured structural coating is configured to dissipate heat generated by the LEDs.
10. The LED lighting device of claim 1 , wherein the cured structural coating is disposed over at least a portion of the LEDs and is configured to transmit the light generated by the LEDs.
11. The LED lighting device of claim 1 , wherein the cured structural coating has a surface texture with an effective surface area at least three times greater than an untextured surface of the same size.
12. The LED lighting device of claim 1 , wherein the cured structural coating comprises a thermosetting material.
13. The LED lighting device of claim 1 , wherein the cured structural coating comprises a radiation cured material.
14. The LED lighting device of claim 1 , wherein the cured structural coating has an optical transmissivity of at least 85% in a wavelength range of light between about 390 nm and about 700 nm.
15. The LED lighting device of claim 1 , wherein the substrate has a first major surface and an opposing second major surface, the LEDs are disposed on the first major surface and the cured structural coating is disposed on the second major surface.
16. The LED lighting device of claim 1 , further comprising an optical coating layer, the optical coating layer configured reflect, scatter, direct, or transmit the light emitted by the LEDs.
17. The LED lighting device of claim 1 , further comprising a thermal coating layer, the thermal coating layer configured to dissipate heat generated by the LEDs and having a thermal conductivity greater than about 100 W/mK.
18. The LED lighting device of claim 1 , further comprising an optical sheet disposed over the LEDs, the optical sheet configured to guide the light between the sheet and the LED assembly for a distance before outcoupling the light.
19. The LED lighting device of claim 1 , wherein overall dimensions of the LED light bulb are similar to an incandescent light bulb of equivalent luminosity.