US Patent No. 10,276,758

SINGULATON OF LIGHT EMITTING DEVICES BEFORE AND AFTER APPLICATION OF PHOSPHOR


Patent No. 10,276,758
Issue Date April 30, 2019
Title Singulaton Of Light Emitting Devices Before And After Application Of Phosphor
Inventorship Frank Lili Wei, Eindhoven (NL)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 10,276,758

1. A structure comprising:a stretchable film;
a plurality of light emitting elements situated on un-stretched segments of the stretchable film, each light emitting element comprising:
a top surface and a bottom surface opposite the top surface, the bottom surface being situated on an un-stretched segment of the stretchable film; and
one or more side surfaces connecting the top surface to the bottom surface;
a plurality of streets between the light emitting elements, the streets being situated on stretched segments of the stretchable film, the stretched segments being in a state of greater strain than the un-stretched segments, the stretched segments having a strain greater than 5;
a filler material that fills the plurality of streets from the bottom surface and extends only partly up along the one or more coating side surfaces but not completely along the one or more side surfaces: and
a continuous wavelength conversion coating that extends over the light emitting elements and in the streets between the light emitting elements, such that; the wavelength conversion coating is in contact with the filler material at the base of the wavelength conversion coating, has a substantially flat top surface, and comprises side surfaces shaped by at least two side surfaces of two different light emitting elements.