Light emitting diode package
View Patent ↗An LED package is improved in heat radiating performance. The LED package includes a package substrate having heat radiating means; a heat radiating layer arranged on the package substrate with an area at least larger than a mounting area of a light emitting diode chip to provide a horizontal heat radiating path; and an electrically-connecting structure including first and second conductive leads arranged on the heat radiating layer. The light emitting diode chip is mounted on the heat radiating layer or the first conductive lead by a heat conductive adhesive layer.
1. A light emitting diode package comprising:
a package substrate having heat radiating means;
an upper substrate arranged on the package substrate, the upper substrate having a cavity surrounding a mounting area of a light emitting diode chip;
a heat radiating layer arranged on the package substrate with an area at least larger than the mounting area of the light emitting diode chip to provide a horizontal heat radiating path, the heat radiating layer having a side exposed to the outside of the package, the exposed side being located between the package substrate and the upper substrate;
an electrically-connecting structure including first and second conductive leads arranged on the heat radiating layer; and
the light emitting diode chip mounted on the heat radiating layer or the first conductive lead by a heat conductive adhesive layer;
wherein the heat radiating layer has a heat conductivity higher than that of the heat radiating means; and
the heat radiating layer comprises an electrically conductive material, and is electrically insulated from the first and second conductive leads by an insulating layer interposed between the heat radiating layer and the conductive leads.
2. The light emitting diode package according to claim 1 , wherein the heat radiating layer is provided on substantially all upper surface area of the package substrate.
3. The light emitting diode package according to claim 1 , wherein the heat radiating layer comprises an electrically conductive material, and includes a first heat radiating area where the first conductive lead is provided and a second heat radiating area where the second conductive lead is provided.
4. The light emitting diode package according to claim 3 , wherein the light emitting diode chip includes first and second electrodes on an upper surface thereon and is placed in divided areas to be arranged on both of the first and second heat radiating areas, and
wherein the first and second electrodes of the light emitting diode chip are connected to the first and second conductive leads by wires, respectively.
5. The light emitting diode package according to claim 3 , wherein the light emitting diode chip includes first and second electrodes on lower and upper surfaces thereof, respectively, and is arranged on the first conductive lead in the first heat radiating area so that the first electrode is connected to the first conductive lead, and
wherein the second electrode of the light emitting diode is connected to the second conductive lead by a wire, and the heat conductive adhesive layer is electrically conductive.
6. The light emitting diode package according to claim 5 , further comprising a reflecting layer arranged on an inside wall of the cavity and connected to the heat radiating layer.
7. The light emitting diode package according to claim 1 , further comprising a reflecting layer arranged on an inside wall of the cavity and connected to the heat radiating layer.
8. The light emitting diode package according to claim 1 , wherein the light emitting diode chip includes first and second electrodes on an upper surface thereof, and is arranged to be in direct contact with the heat radiating layer, and
wherein the first and second electrodes of the light emitting diode are electrically connected to the first and second conductive leads by wires, respectively.
9. The light emitting diode package according to claim 1 , wherein the light emitting diode chip includes first and second electrodes on lower and upper surfaces thereof, respectively, and is arranged on the first conductive lead so that the first conductive lead is connected to the first electrode, and
wherein the second electrode of the light emitting diode chip is connected to the second conductive wire by a wire, and the heat conductive adhesive layer comprises an electrically-conductive material.
10. The light emitting diode package according to claim 1 , wherein the heat radiating means of the package substrate is extended in a thickness direction of the package substrate from an area of an upper surface of the package substrate corresponding to the mounting area of the light emitting chip.
11. The light emitting diode package according to claim 1 , wherein the package substrate comprises one selected from a group consisting of a Si substrate, a ceramic substrate and a metal substrate, and is heat conductive to act as the heat radiating means by itself.
12. The light emitting diode package according to claim 1 , wherein the heat radiating means have a heat conductivity of at least 100 W/mK, and the heat radiating layer has a heat conductivity of at least 500 W/mK.
13. The light emitting diode package according to claim 1 , wherein the heat radiating layer comprises one selected from a group consisting of a diamond film, a metal film and a ceramic film.
14. The light emitting diode package according to claim 1 , wherein the heat radiating layer comprises a composite material containing a matrix and a heat conductive filler of a high heat conductivity, the matrix selected from a group consisting of a polymer matrix, a metal matrix and a ceramic matrix.
15. The light emitting diode package according to claim 14 , wherein the heat conductive filler comprises a carbon material.