KR20120014419A

KR20120014419A - Light emitting device package

Info

Publication number: KR20120014419A
Application number: KR1020100076468A
Authority: KR
Inventors: 이은선
Original assignee: 엘지이노텍 주식회사
Priority date: 2010-08-09
Filing date: 2010-08-09
Publication date: 2012-02-17

Abstract

The light emitting device package according to the embodiment includes a body; An electrode located on the body; And a light emitting device positioned in the body and electrically connected to the electrode. The light emitting device includes a first light emitting device and a second light emitting device that emit light of different colors, and the electrode is electrically connected to the first electrode and the second light emitting device which are electrically connected to the first light emitting device. And a second electrode connected thereto. Shapes of the first electrode and the second electrode are different from each other, and an identification mark is formed on at least one of the first electrode and the second electrode.

Description

Light emitting device package {LIGHT EMITTING DEVICE PACKAGE}

The present disclosure relates to a light emitting device package.

Light emitting diodes (LEDs) are a type of semiconductor device that converts electrical energy into light. The light emitting diode has advantages of low power consumption, semi-permanent life, fast response speed, safety and environmental friendliness compared to conventional light sources such as fluorescent and incandescent lamps.

Accordingly, many researches have been conducted to replace the existing light source with light emitting diodes, and the use of light emitting diodes as a light source for lighting devices such as various lamps, liquid crystal displays, electronic signs, and street lamps that are used indoors and outdoors is increasing. to be.

Embodiments provide a light emitting device package capable of reducing defects.

The light emitting device package according to the embodiment may easily identify light emitting devices having similar appearances by an identification mark formed on the electrode. This allows the light emitting device package to be mounted in a correct position or direction in a lighting system or the like. As a result, the defect can be reduced.

1 is a perspective view of a light emitting device package according to a first embodiment.
FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.
3 is a plan view of the light emitting device package of FIG. 1.
4 is a plan view of a light emitting device package according to a second embodiment.
5 is a plan view of a light emitting device package according to a third embodiment.
6 is a plan view of a light emitting device package according to a fourth embodiment.
7 is a view illustrating a backlight unit including a light emitting device package according to an embodiment.
8 is a view illustrating a lighting unit including a light emitting device package according to an embodiment.

In the description of embodiments, each layer, region, pattern, or structure may be “on” or “under” the substrate, each layer, region, pad, or pattern. Substrate formed in ”includes all formed directly or through another layer. Criteria for the top / bottom or bottom / bottom of each layer will be described with reference to the drawings.

The thickness or the size of each layer (film), region, pattern or structure in the drawings may be modified for clarity and convenience of explanation, and thus does not entirely reflect the actual size.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a light emitting device package according to a first embodiment, and FIG. 2 is a cross-sectional view taken along the line II-II of FIG. 1.

1 and 2, the light emitting device package 100 according to the embodiment includes a body 10, electrode groups 30 and 40 positioned on the body 10, and electrode groups 30 and 40. It includes a light emitting device 50 that is electrically connected to. In this case, the body 10 may include a cavity 20, and the light emitting device 50 may be located in the cavity 20. The molding member 60 may be formed while surrounding the light emitting device 50, and the lens 70 may be positioned on the molding member 60. This will be described in more detail as follows.

The body 10 may be formed of a resin such as polyphthalamide (PPA), liquid crystal polymer (LCP), polyamide 9T (polyamid9T, PA9T), metal, photo sensitive glass, sapphire (Al). ₂ O ₃ ), a ceramic, a printed circuit board (PCB), and the like. However, the present embodiment is not limited to these materials.

The body 10 may have various shapes according to the use and design of the light emitting device package 100. For example, the planar shape of the body 10 may have various shapes such as a rectangle and a circle.

The body 10 may be formed with a cavity 20 that is open at the top. In the drawing, the planar shape of the cavity 20 is illustrated in a circle, but is not limited thereto. Therefore, the cavity 20 may have a planar shape having a polygonal shape including a quadrangle.

Sides of the cavity 20 may be perpendicular or inclined to the bottom surface of the cavity 20. When the cavity 20 has an inclined side surface, an angle A formed between the side surface and the bottom surface of the cavity 20 may be 100 degrees to 170 degrees. At this time, the angle A is set to 120 degrees or more, so that the light emitted from the light emitting element 50 can be well reflected.

The body 10 having such a cavity 20 may be formed by stacking a plurality of layers, or may be formed through injection molding or the like. Of course, the body 10 may be formed in various other ways.

In the body 10, electrode groups 30 and 40 electrically connected to the respective light emitting devices 50 are positioned. The electrode groups 30 and 40 may be formed of a metal plate having a predetermined thickness, and another metal layer may be plated on this surface. The electrode groups 30 and 40 may be made of a metal having excellent conductivity. Such metals include titanium (Ti), copper (Cu), nickel (Ni), gold (Au), chromium (Cr), tantalum (Ta), platinum (Pt), tin (Sn), silver (Ag), and the like. There is this.

A portion of the electrode groups 30 and 40 may be exposed through the cavity 20, and the remaining portion may pass through the body 10 and be exposed to the outside. In this embodiment, the electrode groups 30 and 40 are formed in contact with the bottom surface of the cavity 20, but are not limited thereto. Therefore, the electrode groups 30 and 40 may be formed in contact with the upper surface of the body 10.

The light emitting device 50 is positioned in the cavity 20 while being electrically connected to the two electrode groups 30 and 40.

The light emitting device 50 may be configured as a horizontal light emitting device in which two electrode layers (not shown) are exposed in an upward direction, or a vertical light emitting device in which two electrode layers are located opposite to the light emitting layer. In FIG. 2, for example, the light emitting device 50 is formed in contact with the first electrode group 30 among the electrode groups 30 and 40, and the wire is connected to the second electrode group 40 based on the vertical light emitting device. It is shown as connected by 58. When the horizontal light emitting device is applied, the light emitting device 50 may be connected to the first and second electrode groups 30 and 40 by wires 58, respectively.

However, the embodiment is not limited to wire bonding. That is, the light emitting device 50 and the electrode groups 30 and 40 may be electrically connected to each other by die bonding or flip chip in addition to wire bonding.

The light emitting device 50 may include a light emitting diode (LED). In addition, the body 10 may be equipped with a protection element (for example, a zener diode, a varistor) (not shown) for protecting the light emitting element 50.

The molding member 60 is filled while sealing the light emitting device 50 in the cavity 20. The molding member 60 may be made of a light transmissive material such as silicone or epoxy. The molding member 60 may include a fluorescent material that absorbs light emitted from the light emitting device 50 and emits different wavelengths.

The lens 70 for improving light extraction efficiency is positioned on the molding member 60. The lens 70 may be formed by molding a resin or the like, or may be formed by attaching a separately manufactured lens. In the drawings and description, the molding member 60 and the lens 70 are illustrated and described as having different configurations, but the molding member 60 and the lens 70 may be formed together in the same process.

In the present exemplary embodiment, a plurality of light emitting devices 50 emitting light of different colors may be included, and shapes of the electrode groups 30 and 40 corresponding to different light emitting devices 50 may be formed differently. This will be described in more detail with reference to FIG. 3.

3 is a plan view of a light emitting device package 100 according to the first embodiment. For clarity, the illustration of the molding member 60 and the lens 70 is omitted in FIG. 3. This is also the same in the following plan views.

Referring to FIG. 3, the light emitting device 50 includes a first light emitting device 52, a second light emitting device 54, and a third light emitting device 56 that emit light of different colors. In addition, the electrode groups 30 and 40 may be electrically connected to the first and second electrodes 32 and 42 and the second light emitting element 54, respectively. ) And third electrodes 36 and 46 electrically connected to the third light emitting device 56.

First, the first to third electrodes 32, 34, and 36 included in the first electrode group 30 will be described in detail. In the embodiment, the first electrode 32 and the second electrode 34 have different shapes.

When the first light emitting device 52 and the second light emitting device 54 which are symmetrically positioned with respect to the third light emitting device 56 are similar in appearance, it may be difficult to identify the final light emitting device package 100. Therefore, in the present exemplary embodiment, the first light emitting device 52 and the second light emitting device 54 may be distinguished by different shapes of the first electrode 32 and the second electrode 34.

To this end, an identification mark may be formed on at least one of the first electrode 32 and the second electrode 34. Therefore, although the drawing and the description illustrate that the identification mark is formed on the first electrode 32, the embodiment is not limited thereto.

The first electrode 32 includes a pad portion 32a connected to the first light emitting element 52, a line portion 32b extending from the pad portion 32a and drawn out to the outside, and a line portion 32b. First and second convex portions 32c and 32d formed. In this case, the first convex portion 32c and the second convex portion 32d may be symmetrically formed with respect to the line portion 32b.

The second electrode 34 includes a pad portion 34a connected to the second light emitting element 54, a line portion 34b extending from the pad portion 34a and drawn out to the outside, and a line portion 34b. It includes a first convex portion 34c formed in.

That is, while the first electrode 32 includes the second convex portion 32d, the convex portion corresponding to the second convex portion 32d is not formed in the second electrode 34. Therefore, the 1st light emitting element 52 and the 2nd light emitting element 54 can be distinguished using the 2nd convex part 32d of the 1st electrode 32 as an identification mark.

The third electrode 36 may have the same shape as the first electrode 32 or the second electrode 34. In the drawings and the description, the third electrode 36 has the same shape as the second electrode 34. That is, the third electrode 36 includes a pad portion 36a connected to the third light emitting element 56, a line portion 36b extending from the pad portion 36a and drawn out to the outside, and a line portion 36b. ) Includes a first convex portion 36c. However, the embodiment is not limited thereto, and the third electrode 36 may have a shape different from that of the first and second electrodes 32 and 34.

Next, the first to third electrodes 42, 44, and 46 included in the second electrode group 40 will be described in detail. In the embodiment, the first electrode 42 and the second electrode 44 have different shapes. This is to distinguish the first light emitting device 52 and the second light emitting device 54 by changing the shape of the first electrode 42 and the second electrode 44.

To this end, an identification mark may be formed on at least one of the first electrode 42 and the second electrode 44. Therefore, although the drawing and the description illustrate that the identification mark is formed on the first electrode 42, the embodiment is not limited thereto.

The first electrode 42 includes a pad portion 42a connected to the first light emitting element 52, a line portion 42b extending from the pad portion 42a and drawn out to the outside, and a line portion 42b. First and second protrusions 42c and 42d formed. In this case, the first convex portion 42c and the second convex portion 42d may be formed symmetrically with respect to the line portion 42b.

The second electrode 44 includes a pad portion 44a connected to the second light emitting element 54, a line portion 44b extending from the pad portion 44a and drawn out to the outside, and a line portion 34b. It includes a first convex portion 44c formed in.

That is, while the first electrode 42 includes the second convex portion 42d, the convex portion corresponding to the second convex portion 42d is not formed in the second electrode 44. Therefore, the 1st light emitting element 52 and the 2nd light emitting element 54 can be distinguished using the 2nd convex part 42d of the 1st electrode 42 as an identification mark.

The third electrode 46 may have the same shape as the first electrode 42 or the second electrode 44. In the drawings and the description, the third electrode 46 has the same shape as the second electrode 44. That is, the third electrode 46 includes a pad portion 46a connected to the third light emitting element 56, a line portion 46b extending from the pad portion 46a and drawn out to the outside, and a line portion 46b. ) Includes a first convex portion 46c. However, the embodiment is not limited thereto, and the third electrode 46 may have a shape different from that of the first and second electrodes 42 and 44.

In the present embodiment, the first electrode group 30 and the second electrode group 40 all have an identification mark, but the embodiment is not limited thereto. Therefore, it is sufficient if an identification mark is formed in any one of the electrodes constituting the first electrode group 30 and the second electrode group 40. Although the first electrode group 30 and the second electrode group 40 are illustrated and described as having a similar shape, the embodiment is not limited thereto. Therefore, the first electrode group 30 and the second electrode group 40 may have different shapes.

As described above, the first light emitting device 52 and the second light emitting device 54 can be easily distinguished using the second protrusions 32d and 42d of the first electrodes 32 and 42 as identification marks. This allows the light emitting device package 100 to be mounted in a correct position or direction in a lighting system or the like. As a result, the defect can be reduced.

In this case, the first and second light emitting devices 52 and 54, which are difficult to distinguish in appearance, may be light emitting devices that emit blue light and green light, respectively. The third light emitting device 56 may be a light emitting device that emits red light. However, the embodiment is not limited thereto.

In the above-described embodiment, the first to third light emitting devices 52, 54 and 56 are included, but only the first and second light emitting devices 52 and 54 are provided without the third light emitting device 56. It is also possible.

Hereinafter, other embodiments will be described in detail with reference to FIGS. 4 to 6. For the purpose of simplicity and clarity, detailed descriptions of the same or extremely similar configurations as those of the first embodiment will be omitted, and different parts will be described in detail.

4 is a plan view of a light emitting device package according to a second embodiment.

Referring to FIG. 4, in the present embodiment, the first convex portion 32c and the second convex portion 32d of the first electrode 132 of the first electrode group 130 are asymmetric with respect to the line portion 32b. Formed in position. Similarly, the first convex portion 42c and the second convex portion 42d of the first electrode 142 of the second electrode group 140 are formed at positions asymmetric with respect to the line portion 42b.

As described above, in the embodiment, the positions of the first protrusions 32c and 42c and the second protrusions 32d and 42d can be freely deformed.

5 is a plan view of a light emitting device package according to a third embodiment.

Referring to FIG. 5, in the present embodiment, holes H formed in the line portions 32b and 42b of the first electrodes 232 and 242 are referred to as identification marks.

Accordingly, the first electrodes 232 and 242, the second electrodes 234 and 244, and the third electrodes 236 and 246 may be formed by the first convex portions 32c and 42c and 34c and 44c and 36c and 46c. Both the second convex portions 32d and 42d and 34d and 44d and 36d and 46d may be provided. As a result, coupling characteristics between the first electrodes 232 and 242, the second electrodes 234 and 244, and the third electrodes 236 and 246 and the body 10 may be further improved.

The hole H is formed in the line portions 32b and 42b of the portion located between the first convex portions 32c and 42c and the second convex portions 32d and 42d of the first electrodes 32 and 42 formed symmetrically. The hole H can be formed to a desired diameter while maintaining the line width at a predetermined level.

6 is a plan view of a light emitting device package according to a fourth embodiment.

Referring to FIG. 6, in the present embodiment, the tooth portion P is formed in the pad portion 32a of the first electrode 332 of the first electrode group, and the tooth portion P can be used as an identification mark. By the tooth portion P, the contact interface with the body 10 may be increased to improve contact characteristics with the body 10.

At this time, the pad portion 32a of the first electrode 232 of the first electrode group has a larger area than the pad portion 34a of the second electrode 234, and the tooth portion P has the first electrode 232. It is easy to form in the edge part of the line part 32b of the pad part 32a of the pad). According to this, it can prevent that the tooth part P reduces the connection characteristic with the 1st light emitting element 52.

The light emitting device package according to the above-described embodiments and modifications may function as a lighting system such as a backlight unit, an indicator device, a lamp, and a street lamp. This will be described with reference to FIGS. 7 and 8.

7 is a view illustrating a backlight unit including a light emitting device package according to an embodiment. However, the backlight unit 1100 of FIG. 7 is an example of a lighting system, but is not limited thereto.

Referring to FIG. 7, the backlight unit 1100 may be disposed on a bottom cover 1140, a light guide member 1120 disposed in the bottom cover 1140, and at least one side or a bottom surface of the light guide member 1120. The light emitting module 1110 may be included. In addition, a reflective sheet 1130 may be disposed under the light guide member 1120.

The bottom cover 1140 may be formed in a box shape having an upper surface open to accommodate the light guide member 1120, the light emitting module 1100, and the reflective sheet 1130, and may be formed of metal or resin. Can be. However, the present invention is not limited thereto.

The light emitting module 1110 may include a plurality of light emitting device packages 600 mounted on the substrate 700. The plurality of light emitting device packages 600 provides light to the light guide member 1120.

As shown, the light emitting module 1110 may be disposed on at least one of the inner surfaces of the bottom cover 1140, thereby providing light toward at least one side of the light guide member 1120. .

However, the light emitting module 1110 may be disposed under the light guide member 1120 in the bottom cover 1140 to provide light toward the bottom surface of the light guide member 1120. This may be variously modified according to the design of the backlight unit 1100.

The light guide member 1120 may be disposed in the bottom cover 1140. The light guide member 1120 may surface-light the light provided from the light emitting module 1110 and guide the light guide member to a display panel (not shown).

The light guide member 1120 may be, for example, a light guide panel (LGP). The light guide plate may be, for example, an acrylic resin such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), a cyclic olefin copolymer (COC), or a polycarbonate (PC). It may be formed of one of polyethylene naphthalate resin.

The optical sheet 1150 may be disposed above the light guide member 1120.

The optical sheet 1150 may include at least one of, for example, a diffusion sheet, a light collecting sheet, a luminance rising sheet, and a fluorescent sheet. For example, the optical sheet 1150 may be formed by stacking a diffusion sheet, a light collecting sheet, a luminance rising sheet, and a fluorescent sheet. In this case, the diffusion sheet 1150 evenly diffuses the light emitted from the light emitting module 1110, and the diffused light may be focused onto a display panel (not shown) by the light collecting sheet. At this time, the light emitted from the light collecting sheet is light that is randomly polarized. The luminance rising sheet can increase the degree of polarization of light emitted from the light collecting sheet. The light collecting sheet can be, for example, a horizontal or / and vertical prism sheet. In addition, the brightness rising sheet may be, for example, a dual brightness enhancement film. In addition, the fluorescent sheet may be a translucent plate or film containing phosphors.

The reflective sheet 1130 may be disposed under the light guide member 1120. The reflective sheet 1130 may reflect light emitted through the lower surface of the light guide member 1120 toward the exit surface of the light guide member 1120. The reflective sheet 1130 may be formed of a resin having good reflectance, for example, PET, PC, poly vinyl chloride, resin, or the like, but is not limited thereto.

8 is a view illustrating a lighting unit including a light emitting device package according to an embodiment. However, the lighting unit 1200 of FIG. 8 is an example of a lighting system, but is not limited thereto.

Referring to FIG. 8, the lighting unit 1200 includes a case body 1210, a light emitting module 1230 installed in the case body 1210, and a connection terminal installed in the case body 1210 and receiving power from an external power source. 1220.

The case body 1210 is preferably formed of a material having good heat dissipation, for example, may be formed of a metal or a resin.

The light emitting module 1230 may include a substrate 700 and at least one light emitting device package 600 mounted on the substrate 700.

The substrate 700 may be a circuit pattern printed on the insulator, for example, a printed circuit board (PCB), a metal core PCB, a flexible PCB, a ceramic PCB, and the like. It may include.

In addition, the substrate 700 may be formed of a material that efficiently reflects light, or the surface may be formed of a color in which the light is efficiently reflected, for example, white, silver, or the like.

At least one light emitting device package 600 may be mounted on the substrate 700.

Each of the light emitting device packages 600 may include at least one light emitting diode (LED). The light emitting device may include a colored light emitting device for emitting colored light of red, green, blue or white color, and a UV light emitting device for emitting ultraviolet light (UV, UltraViolet).

The light emitting module 1230 may be arranged to have a combination of various light emitting devices to obtain color and luminance. For example, the white light emitting device, the red light emitting device, and the green light emitting device may be combined to secure high color rendering (CRI). In addition, a fluorescent sheet may be further disposed on a traveling path of light emitted from the light emitting module 1230, and the fluorescent sheet changes the wavelength of light emitted from the light emitting module 1230. For example, when the light emitted from the light emitting module 1230 has a blue wavelength band, the fluorescent sheet may include a yellow phosphor, and the light emitted from the light emitting module 1230 may be finally viewed as white light after passing through the fluorescent sheet. do.

The connection terminal 1220 may be electrically connected to the light emitting module 1230 to supply power. According to FIG. 8, the connection terminal 1220 is inserted into and coupled to an external power source in a socket manner, but is not limited thereto. For example, the connection terminal 1220 may be formed in a pin shape and inserted into an external power source, or may be connected to the external power source by wiring.

In the lighting system as described above, at least one of a light guide member, a diffusion sheet, a light collecting sheet, a luminance rising sheet, and a fluorescent sheet may be disposed on a propagation path of light emitted from the light emitting module to obtain a desired optical effect.

The features, structures, effects and the like described in the foregoing embodiments are included in at least one embodiment of the present invention and are not necessarily limited to one embodiment. In addition, the features, structures, effects, and the like illustrated in the embodiments may be combined or modified with respect to other embodiments by those skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments may be modified. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

Claims

Body;
An electrode located on the body; And
A light emitting element positioned in the body and electrically connected to the electrode
Including,
The light emitting device includes a first light emitting device and a second light emitting device for emitting light of different colors,
The electrode includes a first electrode electrically connected to the first light emitting device and a second electrode electrically connected to the second light emitting device,
The light emitting device package of claim 1, wherein the first electrode and the second electrode have different shapes, and an identification mark is formed on at least one of the first electrode and the second electrode.

The method of claim 1,
The first electrode includes a pad portion connected to the first light emitting device and a line portion extending from the pad portion.
The second electrode includes a pad portion connected to the second light emitting element and a line portion extending from the pad portion.
The identification mark is formed on at least one of the pad portion and the line portion of the first electrode and the second electrode.

The method of claim 1,
The first electrode includes first and second convex portions formed on the line portion,
The second electrode includes a first convex portion formed in the line portion,
The light emitting device package of claim 1, wherein the second convex portion of the first electrode is the identification mark.

The method of claim 3,
The light emitting device package of claim 1, wherein the first convex portion and the second convex portion of the first electrode are symmetrical or asymmetrical with respect to the line portion.

The method of claim 1,
The light emitting device package of claim 1, wherein the identification mark hole is formed in the line part of the first electrode.

The method of claim 1,
A light emitting device package in which a tooth portion is formed with the identification mark on the pad portion of the first electrode.

The method of claim 6,
The pad portion of the first electrode has a larger area than the pad portion of the second electrode, the tooth portion is formed in the edge of the line portion side of the pad portion of the first electrode.

The method of claim 1,
The light emitting device further includes a first light emitting device and a third light emitting device emitting light of a color different from that of the second light emitting device,
The electrode further includes a third electrode electrically connected to the third light emitting device,
The third electrode has a light emitting device package having the same shape as the second electrode or the first electrode.

The method of claim 8,
Wherein the first light emitting device emits blue light, the second light emitting device emits green light, and the third light emitting device emits red light.

The method of claim 1,
The light emitting device package is used for the light emitting device package lighting system.