Back to results
US 2026/0090149 A1Published application
Microleds emitting lambertian radiation patterns
AssigneeLumileds LLC
InventorsJeff DiMaria, Zhongmin Ren, Antonio Lopez-Julia, Yu-Chen Shen
Life of this patent
Estimating the term…
Abstract
An LED light source to produce a more Lambertian radiation pattern having a microLED die where the side walls of the die are reflective and sloped at a greater than 20 degrees angle and where the top surface of the LED die is roughened. Scattering particles may also be placed on the top emitting surface of the microLED. An optical element with roughened surfaces may be placed above the microLED die. The microLED die may also be placed in a cup structure with reflective side walls.
Claims20
A LED light source comprising:
- a microLED thin-film flip-chip die or a microLED die having a less than 30 micron thick sapphire layer, the die comprising:
- a top surface,
- a bottom surface,
- semiconductor layers comprising an n-doped layer, a p-doped layer, and an active region;
- each semiconductor layer having sidewalls sloped at a greater than 20-degree angle away from a perpendicular to the bottom surface;
- a reflective side coat covering the sidewalls of the semiconductor layers;
- an n contact;
- and
- a p contact, the n contact and the p contact on a same side of the die.
6 more elements
A LED light source comprising:
- a microLED die comprising:
- an n-doped semiconductor layer;
- a p-doped semiconductor layer;
- and
- an active region,
- a cup structure comprising a bottom and reflective sloped sidewalls, the microLED die located within and attached to the bottom of the cup structure;
- and
- a silicone fill in an interior of the cup structure.
5 more elements
A LED light source comprising:
- a microLED die comprising:
- an n-doped semiconductor layer;
- a p-doped semiconductor layer;
- and
- an active region,
- a cup structure comprising a bottom and sidewalls, the microLED die located within and attached to the bottom of the cup structure;
- and
- a silicone fill in an interior of the cup structure, the silicone fill between 40% and 60% by volume scattering particles.
5 more elements
Dependencies are inferred from the claim text.