LED display with overlay
View Patent ↗A light emitting diode (LED) display device comprises a substrate and a plurality of walls disposed on the substrate, the plurality of walls forming a cavity, the cavity being filled with an encapsulant not including fluorescent material. An LED is disposed on a first portion of the substrate within the cavity. An electrical connection exists between the LED and a second portion of the substrate, and a fluorescent material overlay is located at a top end of the cavity. The LED display device alternatively includes a plurality of LEDs, wherein each LED is disposed within a separate cavity.
1. A light emitting diode (LED) display device comprising:
a substrate;
a plurality of walls disposed on the substrate, the plurality of walls forming a cavity, the cavity being filled with an encapsulant, the encapsulant not including fluorescent material;
an LED disposed on a first portion of the substrate within the cavity;
an electrical connection between the LED and a second portion of the substrate;
and a fluorescent material overlay at a top end of the cavity, wherein the fluorescent material overlay has a thickness that substantially fully converts all light emitted from the LED to fluorescent radiation.
2. A light emitting diode display device according to claim 1 , wherein the fluorescent material overlay includes a layer of phosphor particles.
3. A light emitting diode display device according to claim 1 , wherein the fluorescent material overlay has a substantially consistent thickness and includes a substantially uniform matrix of phosphor particles.
4. A light emitting diode display device according to claim 1 , wherein the fluorescent material overlay includes a combination of two or more fluorescent material types.
5. A light emitting diode display device according to claim 1 , wherein the fluorescent material overlay includes phosphor particles having a mean diameter within the range of 1 micrometer to 50 micrometer.
6. A light emitting diode display device according to claim 1 , wherein the fluorescent material overlay includes phosphor particles having a mean diameter within the range of 10 nanometer to 100 nanometer.
7. A light emitting diode display device according to claim 1 , wherein the fluorescent material overlay includes organic dye.
8. A light emitting diode (LED) display device comprising:
a substrate;
a plurality of walls disposed on the substrate, the plurality of walls forming a cavity;
an LED disposed on a first portion of the substrate within the cavity;
an electrical connection between the LED and a second portion of the substrate; and
a fluorescent material overlay extending over an area at a top end of the cavity, wherein only a first portion of the fluorescent material overlay area includes fluorescent material and wherein a second portion of the fluorescent material overlay area co-extensive with the first portion does not have any fluorescent material.
9. A light emitting diode display device according to claim 8 , wherein the fluorescent material overlay has a substantially consistent thickness and includes a uniform matrix of phosphor particles.
10. A light emitting diode display device according to claim 8 , wherein the fluorescent material overlay includes a combination of two or more fluorescent material types.
11. A light emitting diode display device according to claim 8 , wherein the fluorescent material overlay includes phosphor particles having a mean diameter within the range of 1 micrometer to 50 micrometer.
12. A light emitting diode display device according to claim 8 , wherein the fluorescent material overlay includes phosphor particles having a mean diameter within the range of 10 nanometer to 100 nanometer.
13. A light emitting diode display device according to claim 8 , wherein the fluorescent material overlay includes organic dye.
14. A light emitting diode (LED) display device comprising:
a substrate;
a plurality of cavities, each of the plurality of cavities formed within a plurality of walls disposed on the substrate;
a plurality of LEDs, each of the plurality of LEDs disposed within a separate one of the plurality of cavities, each of the plurality of LEDs disposed on a first portion of the substrate;
a plurality of electrical connections, each of the plurality of electrical connections connecting one of the plurality of LEDs to one or more respective second portions of the substrate; and
a single fluorescent material overlay at a top end of the plurality of cavities.
15. A light emitting diode display device according to claim 14 , wherein the fluorescent material overlay includes a layer of phosphor particles.
16. A light emitting diode display device according to claim 14 , wherein the fluorescent material overlay has a substantially consistent thickness and includes a substantially uniform matrix of phosphor particles.
17. A light emitting diode display device according to claim 14 , wherein the fluorescent material overlay includes phosphor particles having a mean diameter within the range of 1 micrometer to 50 micrometer.
18. A light emitting diode display device according to claim 14 , wherein the fluorescent material overlay includes phosphor particles having a mean diameter within the range of 10 nanometer to 100 nanometer.
19. A light emitting diode display device according to claim 14 , wherein the fluorescent material overlay includes organic dye.
20. A light emitting diode display device according to claim 14 , wherein the fluorescent material overlay include a plurality of fluorescent material types, and each of the plurality of fluorescent material types is included in a corresponding portion or portions of the plurality of cavities.