KR100524656B1 - Polychromatic Light Emitting Diode Package and Polychromatic Light Emitting Diode System - Google Patents

Abstract

The present invention relates to a multicolor high power light emitting diode package and system. The multicolor light emitting diode package of the present invention includes a plurality of heat dissipation members, a package body for disposing the plurality of heat dissipation members at a predetermined distance from each other, and a plurality of light emissions bonded to the plurality of heat dissipation members, respectively, to emit light having different wavelengths. And a plurality of electrodes fixed to the package body and electrically connected to at least one side of the plurality of light emitting elements and the plurality of heat dissipation members.

Description

Polychromatic Light Emitting Diode Package and Polychromatic Light Emitting Diode System

TECHNICAL FIELD The present invention relates to light emitting diode packages and systems, and more particularly to multicolor high power light emitting diode packages and systems.

There is a growing interest in lighting using light emitting diodes (LEDs). In order to use LEDs for lighting, not only the quality of light emission is required but also light output of more than several thousand lumens (one luminous flux emitted per unit of light from one candela light source) is required. Since the light output is proportional to the input current, high output can be obtained by providing a high current, but there is a problem that a lot of heat is generated when the input current is increased. Therefore, recently, a light emitting diode package having a heat dissipation structure has been proposed.

1 is an exploded perspective view of a typical light emitting diode package having a heat dissipation structure. Referring to the drawings, the heat dissipation member 103 is fixed to the central portion of the main body 101, and the light emitting element 105 is bonded inside the heat dissipation member 103. The main body 101 is provided with a pair of leads 111 to protrude to the outside. The light emitting device 105 is mounted on a submount 109 serving as a circuit board, and is electrically connected to the lead 111. The light emitting element 105 is protected by a lens 107 covering the upper surface of the main body 101. In the conventional light emitting diode package having such a heat dissipation structure, heat generated from the light emitting element 105 is dissipated through the heat dissipation member 103. Therefore, when the input current having a large value is supplied to the light emitting device 105, optical high power can be obtained.

However, in the conventional high output light emitting diode package 100, only a single color such as red, blue, or white can be realized, and multicolor light emission cannot be realized. In order to realize a multi-color, that is, three or seven colors or more, it is essential to have two or three or more light emitting devices and to turn on / off each light emitting device. However, in the conventional LED package 100, even if the red (R), green (G), and blue (B) light emitting elements for emitting light of different wavelengths are provided, the power input from the outside is emitted from each light. The structure can only be supplied to the device at the same time. Therefore, the conventional LED package 100 cannot realize multi-color light emission while turning on / off the power supply of each LED.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem in the related art, and an object thereof is to provide a very high efficiency multicolor high output light emitting diode package capable of selectively changing the color emitted.

The multi-color light emitting diode package of the present invention for achieving the above object is a plurality of heat dissipation member, the package body for arranging the plurality of heat dissipation member at a predetermined distance, and bonded to the plurality of heat dissipation member, respectively of different wavelengths A plurality of light emitting elements for emitting light, and a plurality of electrodes fixed to the package main body and connected to at least one side of the plurality of light emitting elements and the plurality of heat dissipation members.

The plurality of heat dissipation members may be provided to be opposed to each other, and light emitting devices emitting light of different wavelengths may be bonded to each other. In addition, three of the plurality of heat dissipation members may be disposed radially around the axis of the package body, and red, green, and blue light emitting devices may be bonded, respectively. A plurality of light emitting elements may be bonded to each of the heat radiating members. The apparatus may further include an additional heat radiation member selectively interposed between the plurality of heat radiation members about an axis of the package body. In this case, a zener diode may be installed in the additional heat radiation member. The plurality of electrodes may include (+) electrodes or (−) electrodes provided in the same number as the number of light emitting devices, and at least one electrode of another electrode.

The multicolor light emitting diode system of the present invention for achieving the above object includes a multicolor light emitting diode package as described above, and a controller for controlling the power supplied to the multicolor light emitting diode package, the controller is supplied to each light emitting device Control the amount of voltage or current.

Hereinafter, a multicolor high power light emitting diode package of the present invention will be described in detail with reference to the accompanying drawings.

(First embodiment)

FIG. 2 is a perspective view of a multicolor high power light emitting diode package according to a first embodiment of the present invention with a lens removed, FIG. 3 is an exploded perspective view of FIG. 2, and FIG. 4 is a multicolor high power output of FIG. A cross-sectional view of a light emitting diode package. As can be seen from these figures, the multicolor high power light emitting diode package of the present invention includes (1) three heat dissipation members 21, a package body 11 for fixing the positions of these heat dissipation members 21, and a heat dissipation member. Three light emitting elements 31, 33, 35 bonded to 21 are included. Four electrodes 41, 43, 45, 47 are fixed to the package main body 11.

The package body 11 can be manufactured from a disk-shaped plastic material, and three receiving grooves 13 are formed in the center thereof. Each receiving groove 13 is partitioned by three partition walls 15 extending radially at regular intervals around the axis of the package body 11. Each partition wall 15 prevents electrical contact between the heat dissipation members 21 fixed in the corresponding receiving groove 13 to be described later.

An electrode mounting groove 17 recessed with respect to the reference surface is formed on the upper surface of the package body 11 along the circumferential direction. Four electrodes 41, 43, 45, 47 are mounted in the electrode seating groove 17 at regular intervals along the longitudinal direction thereof. To this end, four electrode grooves 19 for accommodating each of the electrodes 41, 43, 45, and 47 are formed on the outer surface of the package body 11 at regular intervals. The lens 3 is coupled to an upper portion of the electrode seating groove 17 to which the electrodes 41, 43, 45, and 47 are coupled.

As can be seen in more detail in FIG. 5, the coupling groove 18 recessed with respect to the reference surface is also formed along the circumferential direction on the lower surface of the package body 11. The coupling groove 18 is partitioned at regular intervals by the ends of each partition wall 15, and the lower portion of the heat dissipation member 21, which will be described later in detail, is disposed in the partitioned portions.

The heat dissipation members 21 have a fan shape corresponding to each receiving groove 13 formed in the package body 11. An inclined surface is formed on the upper portion 23 of each of the heat dissipation members 21, and the inclined surface reflects the light generated by the light emitting elements 31, 33, and 35 upwards, so that effective illumination is possible. Each of the heat dissipation members 21 includes a lower portion 25 extending outward in the horizontal direction and has good heat dissipation characteristics. The extended lower portion 25 of the heat dissipation member 21 is fitted into and fixed in the coupling groove 18 formed on the lower surface of the package body 11. These heat dissipation members 21 may be simply integrally molded insert when molding the package body (11).

In the present invention, the heat dissipation member 21 may have, for example, a heat sink having excellent heat conduction characteristics. The material and characteristics of the heat sink and the technology in which the heat sink is applied to the LED package are general to those skilled in the art as described with reference to FIG. 1, which shows a conventional general light emitting diode package, and a detailed description thereof will be omitted.

The light emitting elements 31, 33, 35 are composed of those which emit light of different wavelengths. For example, the light emitting device may include a blue light emitting device, a green light emitting device, and a red light emitting device. When the blue light emitting device, the green light emitting device, and the red light emitting devices 31, 33, and 35 emit light of different wavelengths as appropriate, multicolor can be realized. A method of selectively emitting the blue light emitting device, the green light emitting device, and the red light emitting devices 31, 33, and 35 will be described later.

Each of the electrodes 41, 43, 45, and 47 may be divided into an arrangement portion 42 disposed in the package body 11 and an exposed portion 44 exposed to the outside of the package body 11. The placement portion 42 of each electrode has a hook shape so as not to be outwardly deviated in the electrode seating groove 17 of the package body. The exposed portion 44 of each electrode is bent downward from the placement portion 42 and then outwardly bent again to protrude relative to the axis of the package body 11. The plurality of electrodes 41, 42, 43, and 45 may also be integrally insert molded during molding of the package body 11.

Hereinafter, the operation of the multicolor high power light emitting diode package according to the first embodiment described above with reference to FIGS. 2 to 5 will be described with reference to FIG. 6. FIG. 6 shows light emitting elements 31, 33, 35, heat dissipation member 21 and electrodes 41 of the multicolor high output light emitting diode package 1 according to the first embodiment bonded to a wire 51 to be electrically connected. This is a plan view showing the connected state.

Referring to the drawings, four electrodes 41 are provided around the heat dissipation member 21 disposed radially at a predetermined distance. Three of the four electrodes 41 are provided as positive electrodes, and the other one is provided as negative electrodes. In this case, three (+) electrodes may be wire-bonded to the light emitting elements 31, 33, and 35, respectively, and the other one (-) electrode may be wire-bonded to the heat dissipation member 21.

In such a configuration, the power applied to the three (+) electrodes can be controlled using a controller (not shown), for example, an on / off switch controller. For example, only the power supplied to one (+) electrode can be turned on and the power supplied to the other two (+) electrodes can be turned off. Then, only the corresponding light emitting device can operate to emit only one of its own color, that is, blue, green and red. If all of the power supplied through the three (+) electrode is turned on, all three light emitting devices operate to realize a white color. Similarly, six colors are represented by combining two colors by selectively turning on the two (+) electrodes. In this case, by combining the colors by controlling the intensity of the light by controlling the amount of voltage or current applied to each light emitting device, not the on / off switch controller, it is possible to realize all the colors of the visible region.

In the multi-color light emitting diode package 1 of the first embodiment, although not shown, three (+) electrodes are wire-bonded to each heat radiating member 21, and one (-) electrode is connected to each light emitting element 31, respectively. 33 and 35 may be wire bonded. The effect thereof is of course the same as described above.

In the above-described first embodiment, only one light emitting element 31, 33, 35 is bonded to each heat radiating member 21, but two or more light emitting elements may be bonded, of course. Accordingly, it is possible to provide a multicolor high output light emitting diode which is more efficient.

(2nd Example)

7 is a perspective view of a multicolor high power light emitting diode package according to a second embodiment of the present invention. The multicolor high power light emitting diode package of the second embodiment further includes an additional heat dissipation member 63 as compared with the first embodiment described above, and a package for positioning and fixing the four heat dissipation members 21 and 63. The shape of the main body 71 is deformed.

Referring to FIG. 7, four housing grooves are formed in the center of the package body 71. Each receiving groove has an angle smaller than that of the above-described embodiment, and is disposed radially about the axis of the package body 71. The heat dissipation members 21 and 63 of the corresponding size are respectively accommodated in the accommodation grooves and fixed.

Three (21) of the four heat radiating members (21, 63) are bonded with a red light emitting device, a green light emitting device, and a blue light emitting device (31, 33, 35) for emitting light of different wavelengths. The zener diode 65 may be bonded to the other heat dissipation member 63. Here, the zener diode 65 serves to maintain a constant voltage.

In the multicolor high output light emitting diode package according to the present embodiment, each of the heat dissipation members 21 and 63, the light emitting elements 31, 33, 35, and the zener diode 65 are provided on three (+) electrodes and one (-) electrode. ) Can be appropriately wire bonded. The power applied to each of the positive electrodes can be appropriate on / off control. Accordingly, as in the above-described first embodiment, not only a blue, green, or red color can be realized, but also all colors corresponding to the visible region including white can be provided.

In the multicolor light emitting diode package 61 of the present embodiment, the constant voltage is maintained by the zener diode 65 even when static electricity or a sudden current is supplied. Therefore, the reliability of the product can be increased.

On the other hand, in the multi-color light emitting diode package 61 of the present embodiment, the zener diode 65 is provided in the additional heat dissipation member 63, but the additional heat dissipation member 63 without the zener diode 65 is directly connected to the electrode. The structure by which the wire bonding was carried out is also possible. The plurality of light emitting elements 31, 33, 35 can be bonded to each of the heat dissipation members 21, 63 is also the same as in the above-described embodiment.

In the above-described multicolor light emitting diode packages 1 and 61 of the first and second embodiments, three and four heat dissipation members are provided, and each of the heat dissipation members includes a red light emitting device, a green light emitting device, or a blue light emitting device. The structure which installed each was demonstrated. However, in the present invention, two heat dissipation members may be provided, and each of the two heat dissipation members may be equipped with any two chips of a red light emitting device, a green light emitting device, and a blue light emitting device. In this case, seven colors may not be implemented in the on / off control, but three colors may be implemented. The present invention is also not limited to the configuration having two, three, or four heat dissipation members, of course, can be changed to a configuration having more than that.

As described above, according to the present invention, after mounting one or a plurality of chips emitting light of different wavelengths to the plurality of heat radiating members, the voltage or current supplied to each light emitting element can be controlled. Thereby, a high output light emitting diode package capable of realizing very high efficiency multicolor light emission is provided.

1 is an exploded view of a typical light emitting diode package having a heat dissipation structure.

Figure 2 is a perspective view of a multicolor high power light emitting diode package according to a first embodiment of the present invention, with the lens removed.

3 is an exploded perspective view of the multicolor high power light emitting diode package shown in FIG. 2;

4 is a cross-sectional view of the multicolor high power light emitting diode package of FIG.

FIG. 5 is a bottom perspective view of the package body of the multicolor high power light emitting diode package of FIG. 2; FIG.

6 is a view for explaining the operation of the multi-color high-power LED package according to the first embodiment of the present invention, a plan view showing a plurality of light emitting elements, heat sinks and electrodes are wire bonded.

FIG. 7 is a perspective view of a multicolor high power light emitting diode package according to a second embodiment of the present invention, in which four heat dissipation members are installed in the package body; FIG.

<Explanation of symbols for the main parts of the drawings>

1, 61: high power light emitting diode package

3: lens

11, 71: package body

13: receiving home

15: bulkhead

21, 63: heat dissipation member

31, 33, 35: light emitting element

41, 43, 45, 47: electrode

65: Zener Diode

Claims (8)

A plurality of heat dissipation members, A package body for disposing the plurality of heat dissipation members at a predetermined distance from each other; A plurality of light emitting elements bonded to the plurality of heat radiating members to emit light of different wavelengths; And a plurality of electrodes fixed to the package body and electrically connected to at least one side of the plurality of light emitting elements and the plurality of heat dissipation members. The multicolor light emitting diode package of claim 1, wherein the plurality of heat dissipation members are provided to be opposed to each other, and light emitting devices emitting light of different wavelengths are bonded to each other. The method of claim 1, wherein the plurality of heat dissipation members are arranged radially around the axis of the package main body, each of the red light emitting device, the green light emitting device and the blue light emitting device is characterized in that the multi-color LED package. The multicolor light emitting diode package of any one of claims 1 to 3, wherein a plurality of light emitting elements are bonded to each of the heat radiating members. The multicolor light emitting diode package according to any one of claims 1 to 3, further comprising an additional heat dissipation member selectively interposed between the plurality of heat dissipation members about an axis of the package body. 6. The multicolor light emitting diode package of claim 5, wherein a zener diode is installed in the additional heat dissipation member. The electrode according to any one of claims 1 to 3, wherein the plurality of electrodes include a positive electrode or a negative electrode and at least one electrode of another polarity provided in the same number as the number of light emitting devices. Multicolor light emitting diode package, characterized in that. The multi-color light emitting diode package according to any one of claims 1 to 3, It includes a controller for controlling the power supplied to the multi-color light emitting diode package, Wherein said controller controls the amount of voltage or current supplied to each light emitting element.