Encapsulant profile for light emitting diodes
View Patent ↗A light emitting packaged diode ids disclosed that includes a light emitting diode mounted in a reflective package in which the surfaces adjacent the diode are near Lambertian reflectors. An encapsulant in the package is bordered by the Lambertian reflectors and a phosphor in the encapsulant converts frequencies emitted by the LED chip and, together with the frequencies emitted by the LED chip, produces white light. A substantially flat meniscus formed by the encapsulant defines the emitting surface of the packaged diode.
1. A light emitting diode (LED) package, comprising:
an LED with a Lambertian or near Lambertian emission pattern;
a package recess having reflective surfaces, said LED mounted in said package recess;
an encapsulant in said package recess and covering said LED, a top surface of said encapsulant including a curved meniscus that is within about 50 microns of a top surface of said package; and
a phosphor in said encapsulant, wherein said phosphor is proximate said LED.
2. The LED package of claim 1 , wherein said top surface of said encapsulant is dome-shaped.
3. The LED package of claim 1 , wherein said reflective surfaces are near-Lambertian reflectors.
4. The LED package of claim 1 , arranged for surface mounting.
5. The LED package of claim 1 , wherein said phosphor is on said LED.
6. The LED package of claim 1 , wherein said encapsulant further comprises a light diffuser.
7. The LED package of claim 6 , wherein said diffuser physically scatters light within said encapsulant.
8. A light emitting diode (LED) package, comprising:
an LED;
a package recess having reflective surfaces, said LED mounted in said package recess;
an encapsulant in said package recess and covering said LED, said encapsulant having an encapsulant curved top surface with a highest or lowest portion that is within 50 microns of a package top surface; and
a phosphor in said encapsulant, wherein said phosphor is proximate said LED.
9. The LED package of claim 8 , wherein said encapsulant top surface is concave.
10. The LED package of claim 8 , wherein said encapsulant top surface is convex.
11. The LED package of claim 8 , wherein said reflective surfaces comprise walls and a floor.
12. The LED package of claim 8 , arranged for surface mounting.
13. The LED package of claim 8 , wherein said phosphor is on said LED.
14. The LED package of claim 8 , wherein said encapsulant further comprises a light diffuser.
15. The LED package of claim 14 , wherein said light diffuser physically scatters light within said encapsulant.
16. A display, comprising:
a light guide; and
at least one side view light emitting diode (LED) package arranged to emit light into said light guide, said LED package comprising:
an LED with a Lambertian or near Lambertian emission pattern;
a package recess having reflective surfaces, said LED mounted in said package recess;
an encapsulant in said package recess and covering said LED, a top surface of said encapsulant including a domed meniscus that is within about 50 microns of a top surface of said package; and
a phosphor in said encapsulant, wherein said phosphor is proximate said LED.
17. A display, comprising:
a light guide; and
at least one side view light emitting diode (LED) package arranged to emit light into said light guide, said LED package comprising:
an LED with a Lambertian or near Lambertian emission pattern;
a package recess having reflective surfaces, said LED mounted in said package recess;
an encapsulant in said package recess and covering said LED, said encapsulant having a curved top surface with a highest or lowest portion that is within 50 microns of a package top surface; and
a phosphor in said encapsulant, wherein said phosphor is proximate said LED.