KR101790052B1 - Light emitting device package - Google Patents

Abstract

The light emitting device package according to the embodiment may include a light emitting element, a cavity formed on the lead frame on which the light emitting element is disposed, and an inner side surface of the cavity and the lead frame having a first inclination angle And a moisture control dam contacting the inner surface of the cavity and the lead frame, the moisture control dam having a second inclination angle with the lead frame.

Description

A light emitting device package

The embodiment relates to a light emitting device package with improved reliability.

As a typical example of a light emitting device, a light emitting diode (LED) is a device for converting an electric signal into an infrared ray, a visible ray, or a light using the characteristics of a compound semiconductor, and is used for various devices such as household appliances, remote controllers, Automation equipment, and the like, and the use area of LEDs is gradually widening.

In general, miniaturized LEDs are made of a surface mounting device for mounting directly on a PCB (Printed Circuit Board) substrate, and an LED lamp used as a display device is also being developed as a surface mounting device type . Such a surface mount device can replace a conventional simple lighting lamp, which is used for a lighting indicator for various colors, a character indicator, an image indicator, and the like.

As the use area of the LED is widened as described above, it is important to increase the luminance of the LED as the brightness required for a lamp used in daily life and a lamp for a structural signal is increased.

The embodiment provides a light emitting device package having a new structure and improved reliability.

A light emitting device package according to an embodiment includes a light emitting device, a cavity formed on the lead frame on which the light emitting device is disposed, a body having a first inclination angle with the inner surface of the cavity and the lead frame, And a moisture control dam contacting the lead frame and forming a second inclination angle with the lead frame.

The light emitting device package according to the embodiment can control the moisture and foreign matter introduced from the lower portion of the lead frame by forming the moisture control dam in the cavity and prevent discoloration of the lead frame due to moisture and foreign matter, There is an advantage that the lifetime and the reliability of the device are improved.

1 is a top view illustrating a light emitting device package according to a first embodiment.
Fig. 2 is a perspective view showing the first and second lead frames shown in Fig. 1. Fig.
3 is a cross-sectional view of the light emitting device package shown in Fig. 1 cut in the PP direction.
4 is an enlarged view of the portion P1 shown in Fig.
5 is a perspective view illustrating a lighting device including a light emitting device package according to an embodiment.
6 is a cross-sectional view showing an AA 'cross-section of the illumination device shown in Fig.
7 is an exploded perspective view of a liquid crystal display device including the light emitting device package according to the first embodiment.
8 is an exploded perspective view of a liquid crystal display device including the light emitting device package according to the second embodiment.

In the description of this embodiment, in the case where a device is described as being formed "on or under" another device, the upper (upper) or lower (lower) on or under includes both the two devices being in direct contact with each other or one or more other devices being indirectly formed between the two devices. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one device.

In the drawings, the thickness and size of each layer are exaggerated, omitted, or schematically illustrated for convenience and clarity. Therefore, the size of each component does not entirely reflect the actual size.

In this specification, the angles and directions mentioned in the process of describing the structure of the light emitting device module are based on those shown in the drawings. In the description of the structure of the light emitting device module in the specification, reference points and positional relationship with respect to angles are not explicitly referred to, refer to the related drawings.

1 is a top view illustrating a light emitting device package according to a first embodiment.

Referring to FIG. 1, the light emitting device package 100 may include a light emitting device 110 and a body 120.

The body 120 may be formed of a resin material such as polyphthalamide (PPA), silicon (Si), aluminum (Al), aluminum nitride (AlN), AlOx, photo sensitive glass (PSG) (PA9T), syndiotactic polystyrene (SPS), a metal material, sapphire (Al2O3), beryllium oxide (BeO), ceramics, and a printed circuit board (PCB).

The body 120 may be formed by injection molding, etching, or the like, but is not limited thereto.

The shape of the top surface of the body 120 may have various shapes such as a triangle, a quadrangle, a polygon, and a circle according to the use and design of the light emitting device 110, but is not limited thereto.

The body 120 forms a cavity s in which the light emitting device 110 is disposed and the sectional shape of the cavity s may be formed into a cup shape or a concave container shape. The side surface may be formed to be inclined downward.

The planar shape of the cavity s may have various shapes such as a circular shape, a rectangular shape, a polygonal shape, an elliptical shape, and the like, but is not limited thereto.

At this time, a lead frame 125 including a first lead frame 123 and a second lead frame 124 spaced apart from the first lead frame 123 may be disposed on the lower surface of the body 120, The first and second lead frames 123 and 124 are made of a metal material such as titanium, copper, nickel, gold, chromium, tantalum, (Al), indium (In), palladium (Pd), cobalt (Co), silicon (Si), germanium (Ge), hafnium (Hf), ruthenium (Ru), and iron (Fe).

Further, the first and second lead frames 123 and 124 may be formed to have a single layer or a multilayer structure, but are not limited thereto.

The inner side surface of the cavity s is inclined at a predetermined inclination angle with respect to any one of the first and second lead frames 123 and 124. The angle of reflection of light emitted from the light emitting element 110 varies depending on the inclination angle So that the directing angle of the light emitted to the outside can be adjusted. As the directional angle of light decreases, the concentration of light emitted to the outside from the light emitting device 110 increases, while the concentration of light emitted from the light emitting device 110 to the outside decreases as the directional angle of light increases.

The inner surface of the cavity s may have a plurality of inclination angles, but is not limited thereto.

The first and second lead frames 123 and 124 are electrically connected to the light emitting element 110 and are connected to the positive and negative poles of an external power source ). ≪ / RTI >

The light emitting element 110 is mounted on the first lead frame 123 and the light emitting element 110 is die-bonded to the first lead frame 123. The light emitting element 110 is connected to the second lead frame 124 by a wire (not shown) And can be supplied with power from the first and second lead frames 123 and 124 by wire bonding.

Here, the light emitting device 110 may be wire-bonded or die-bonded to the first and second lead frames 123 and 124, but is not limited thereto.

In addition, a cathode mark (not shown) may be formed on the body 120. The cathode mark distinguishes the polarity of the light emitting element 110, that is, the polarity of the first and second lead frames 123 and 124, so that when the first and second lead frames 123 and 124 are electrically connected, .

The light emitting device 110 may be a light emitting diode. The light emitting diode may be, for example, a colored light emitting diode that emits light such as red, green, blue, or white, or a UV (Ultra Violet) light emitting diode that emits ultraviolet light. However, A plurality of light emitting devices 110 may be mounted on the frame 123. At least one light emitting device 110 may be mounted on the first and second lead frames 123 and 124, And the mounting position are not limited.

Further, the body 120 may further include a resin material 126 filled in the cavity s. That is, the resin material 126 may be formed in a double molding structure or a triple molding structure, but is not limited thereto.

The resin material 126 may be formed in a film shape and may include at least one of a phosphor and a light diffusing material. The phosphor may be at least two or more kinds of fluorescent materials, and may be a translucent material Materials may be used and are not limited thereto.

A moisture control dam 129 may be formed in the lead frame 125. The moisture control dam 129 may include a first lead frame 123 and a first moisture control dam 127 contacting the inner surface of the cavity s And a second moisture control dam 128 contacting the inner surface of the second lead frame 124 and the cavity s.

The first and second moisture control dams 127 and 128 are connected to the first and second lead frames 123 and 124 so that at least one of moisture and foreign matter passes through the lower portions of the first and second lead frames 123 and 124, Can be controlled.

That is, the first and second lead frames 123 and 124 are formed with holes (not shown) in an area overlapping the body 120, so that the first and second lead frames 123 and 124 ) Is soldered, moisture and foreign matter may be introduced through the hole.

Accordingly, the first and second moisture control dams 127 and 128 can control the moisture and foreign matter introduced through the holes.

The first and second moisture control dams 127 and 128 will be described in detail below with reference to the drawings.

FIG. 2 is a perspective view showing the first and second lead frames shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along the line P-P of the light emitting device package shown in FIG.

Referring to FIG. 2, the first and second lead frames 123 and 124 include first and second holes h1 and h2 and first and second grooves v1 and v2 through which an injection material flows to form a body (not shown) v2 can be formed.

Here, the first and second grooves v1 and v2 may be disposed in the lower plane s1 of the cavity (not shown).

The first and second holes h1 and h2 and the first and second grooves v1 and v2 are identical to each other and are formed to be symmetrical with respect to the center between the first and second lead frames 123 and 124 However, there is no limitation.

In the embodiment, the first and second grooves v1 and v2 and the first and second holes h1 and h2 are shown in a rectangular shape as viewed from the top, but the present invention is not limited thereto.

That is, the first and second holes h1 and h2 may be circular, semicircular, elliptical, or polygonal, and the first and second grooves v1 and v2 may be formed in a ' But it is not limited thereto.

At this time, the lengths (not shown) of the first and second grooves v1 and v2 may be equal to or longer than the lengths of the first and second holes h1 and h2, .

A zener element (not shown) may be disposed in at least one of the first and second grooves v1 and v2, but is not limited thereto.

2 and 3, the light emitting device package 100 includes a first moisture control dam 127 (not shown) contacting the first inner side surface 120a of the inner side surface of the cavity s and the first lead frame 123, And a second moisture control dam 128 contacting the second inner surface 120b and the second lead frame 124 facing the first inner surface 120a of the inner surface of the cavity s. have.

Here, the first and second moisture control dams 127 and 128 have the same cross-sectional shape and the same width, but are not limited thereto.

The body 120 may be formed on the upper portions of the first and second lead frames 123 and 124 by a resin (not shown) introduced through the first and second holes h1 and h2. May include first and second inner side surfaces 120a and 120b forming a cavity s.

At this time, the lower surfaces of the first and second lead frames 123 and 124 may be soldered to a copper foil layer (not shown) formed on a printed circuit board (not shown).

That is, the first and second lead frames 123 and 124 are expanded and contracted by heat generated depending on whether the light emitting element 110 emits light, and the first and second lead frames 123 and 124 are disposed between the first and second holes h1 and h2 and the body 120 A fine gap may be formed, and moisture and foreign matter may be introduced into the cavity s through the gap. At this time, the first and second moisture control dams 127 and 128 can control the introduction of moisture and foreign matter into the cavity s.

The first moisture control dam 127 may be in contact with the inner surface of the first groove v1 and the first inner surface 120a. Further, the second moisture control dam 128 may be in contact with the inner surface of the second groove v2 and the second inner surface 120b.

Although the first and second moisture control dams 127 and 128 are described as being in contact with the first and second inner sides 120a and 120b in the embodiment, , And the inner surfaces 120a and 120b of the first and second inner surfaces 120a and 120b.

That is, the first and second moisture control dams 127 and 128 can be applied along the first and second inner side surfaces 120a and 120b and the first and second moisture control dams 127 and 128 can be adhered to other structures And may be adhered to at least one of the first and second inner side surfaces 120a and 120b and the inner surfaces of the first and second grooves v1 and v2 by a member (not shown).

At this time, the vertical height d1 of the first and second moisture control dams 127 and 128 is equal to the vertical height d1 of the first and second inner damages 127 and 128, 120b, respectively.

The vertical height d0 of the first and second inner side surfaces 120a and 120b indicates the upper side of the first and second inner side surfaces 120a and 120b on a line parallel to the lower side of the first lead frame 123, The vertical height d1 of the first and second moisture control dams 127 and 128 is set to a level on the lower line of the first and second grooves v1 and v2 to the upper line of the first and second moisture control dams 127 and 128 .

The vertical height d1 of the first and second moisture control dams 127 and 128 may be 0.3 to 0.7 times the vertical height d0 of the first and second inner sides 120a and 120b, The fact that the moisture and foreign matter introduced into the fine gaps between the first and second holes h1 and h2 and the body 120 flows into the cavity s through the first and second grooves v1 and v2, The amount of moisture and foreign matter introduced into the cavity s through the first and second moisture control dams 127 and 128 is not controlled by the two moisture control dams 127 and 128, Fold to 0.7 fold.

Here, the first and second moisture control dams 127 and 128 may include at least one of Ag, Au, Pt, Al, Cu, and Pb.

Referring again to Figures 2 and 3, the first groove v1 is spaced a first distance b1 from the light emitting element 110 and spaced a third distance b3 from the first inner side 120a .

The second groove v2 may be spaced apart from the light emitting element 110 by a second distance b2 and may be spaced by a fourth distance b4 from the second inner side 120b.

The first distance b1 may be equal to or less than the second distance b2 and the third distance b3 may be equal to or greater than the fourth distance b4.

That is, the first and third distances b1 and b3 may have an inverse relationship with the second and fourth distances b2 and b4. In this case, the widths (not shown) of the first and second grooves v1 and v2 They are the same as each other.

The third and fourth distances b3 and b4 correspond to the lower plane s1 of the cavity s shown in Fig. 2, that is, the first and second inner sides 120a and 120b and the first and second lead frames 123 and 123, 124 may be spaced apart from the interface between the first and second grooves v1, v2.

At this time, the sum of the first and third distances b1 and b3 may be equal to the sum of the second and fourth distances b2 and b4, and the depth (not shown) of the first and second grooves v1 and v2 May be 0.3 to 0.8 times the thickness of the first and second lead frames 123 and 124, and may be 1 mm to 2 mm.

That is, the depths of the first and second grooves v1 and v2 are closely related to the thicknesses of the first and second lead frames 123 and 124. If the thickness is less than 1 mm, the grooves can not be fulfilled satisfactorily. The first and second lead frames 123 and 124 may be broken.

4 is an enlarged view of the portion P1 shown in Fig.

4, reference numerals and explanations of the parts overlapping with those of Figs. 2 and 3 are omitted.

4, the first moisture control dam 127 includes a first surface 127a contacting the first inner side surface 120a and a second surface 127a opposite to the first surface 127a, And a surface 127b.

Here, the first inner side surface 120a forms a first inclination angle? 1 with the first lead frame 123, and the second surface 127b forms a second inclined angle? 2 with the first lead frame 123 .

In the embodiment, the second inclination angle? 2 is different from the first inclination angle? 1. However, when the sectional shape of the first moisture control dam 127 is a rectangular shape, the first inclination angle? There is no limitation.

That is, the second inclination angle [theta] 2 may be larger than the first inclination angle [theta] 1. This is because the sectional shape of the first moisture control dam 127 may have a pyramid shape.

As such, the first moisture control dam 127 is formed with the second inclination angle [theta] 2 different from the first inclination angle [theta] 1 of the first inner side surface 120a, thereby increasing the steering angle (not shown).

Although the first moisture control dam 127 is described as being the same as the second moisture control dam 128 in the embodiment, the second moisture control dam 128 is exposed to the cavity s and the first moisture control dam 127 (Not shown) opposite to the second surface 127b of the first lead frame 124 may form a third inclination angle (not shown) different from the second inclination angle? 2 with respect to the second lead frame 124, .

FIG. 5 is a perspective view illustrating a lighting device including a light emitting device package according to an embodiment, and FIG. 6 is a cross-sectional view showing a cross section taken along line A-A 'of the lighting device shown in FIG.

In order to describe the shape of the illumination device 300 according to the embodiment in detail, the longitudinal direction Z of the illumination device 300, the horizontal direction Y perpendicular to the longitudinal direction Z, The direction Z and the horizontal direction Y and the vertical direction X perpendicular to the horizontal direction Y will be described.

6 is a cross-sectional view of the lighting apparatus 300 of FIG. 5 cut in the longitudinal direction Z and the height direction X and viewed in the horizontal direction Y. FIG.

5 and 6, the lighting device 300 may include a body 310, a cover 330 coupled to the body 310, and a finishing cap 350 positioned at opposite ends of the body 310 have.

The light emitting device module 340 is coupled to a lower surface of the body 310. The body 310 is electrically conductive so that heat generated from the light emitting device package 344 can be emitted to the outside through the upper surface of the body 310. [ And a metal material having an excellent heat dissipation effect.

The light emitting device module 340 may include a light emitting device array (not shown) including a light emitting device package 344 and a printed circuit board 342.

The light emitting device package 344 is mounted on the PCB 342 in a multi-color, multi-row manner to form an array. The light emitting device package 344 can be mounted at equal intervals or can be mounted with various spacings as needed. As the PCB 342, MCPCB (Metal Core PCB) or FR4 material can be used.

The cover 330 may be formed in a circular shape so as to surround the lower surface of the body 310, but is not limited thereto.

The cover 330 protects the internal light emitting element module 340 from foreign substances or the like. In addition, the cover 330 may include diffusion particles to prevent glare of light generated in the light emitting device package 344 and uniformly emit light to the outside, and may include at least one of an inner surface and an outer surface of the cover 330 A prism pattern or the like may be formed on one side. Further, the phosphor may be coated on at least one of the inner surface and the outer surface of the cover 330.

Meanwhile, since the light generated in the light emitting device package 344 is emitted to the outside through the cover 330, the cover 330 should have a high light transmittance and sufficient heat resistance to withstand the heat generated in the light emitting device package 344 The cover 330 is preferably formed of a material including polyethylene terephthalate (PET), polycarbonate (PC), or polymethyl methacrylate (PMMA) .

The finishing cap 350 is located at both ends of the body 310 and can be used for sealing the power supply unit (not shown). In addition, the finishing cap 350 is provided with the power pin 352, so that the lighting device 300 according to the embodiment can be used immediately without a separate device on the terminal from which the conventional fluorescent lamp is removed.

7 is an exploded perspective view of a liquid crystal display device including the light emitting device package according to the first embodiment.

7, the liquid crystal display device 400 may include a liquid crystal display panel 410 and a backlight unit 470 for providing light to the liquid crystal display panel 410 in an edge-light manner.

The liquid crystal display panel 410 can display an image using the light provided from the backlight unit 470. The liquid crystal display panel 410 may include a color filter substrate 412 and a thin film transistor substrate 414 facing each other with a liquid crystal therebetween.

The color filter substrate 412 can realize the color of the image to be displayed through the liquid crystal display panel 410.

The thin film transistor substrate 414 is electrically connected to a printed circuit board 418 on which a plurality of circuit components are mounted through a driving film 417. The thin film transistor substrate 414 may apply a driving voltage provided from the printed circuit board 418 to the liquid crystal in response to a driving signal provided from the printed circuit board 418.

The thin film transistor substrate 414 may include a thin film transistor and a pixel electrode formed as a thin film on another substrate of a transparent material such as glass or plastic.

The backlight unit 470 includes a light emitting device module 420 that outputs light, a light guide plate 430 that changes the light provided from the light emitting device module 420 into a surface light source to provide the light to the liquid crystal display panel 410, A plurality of films 450, 464 and 466 for uniforming the luminance distribution of the light provided from the light guide plate 430 and improving the vertical incidence property and a reflective sheet 430 for reflecting light emitted to the rear of the light guide plate 430 to the light guide plate 430 447).

The light emitting device module 420 may include a PCB substrate 422 for mounting a plurality of light emitting device packages 424 and a plurality of light emitting device packages 424 to form an array.

The backlight unit 470 includes a diffusion film 466 for diffusing light incident from the light guide plate 430 toward the liquid crystal display panel 410 and a prism film 450 for enhancing vertical incidence by condensing the diffused light. And may include a protective film 464 for protecting the prism film 450.

8 is an exploded perspective view of a liquid crystal display device including the light emitting device package according to the second embodiment.

However, the parts shown and described in Fig. 7 are not repeatedly described in detail.

8, the liquid crystal display device 500 may include a liquid crystal display panel 510 and a backlight unit 570 for providing light to the liquid crystal display panel 510 in a direct-down manner.

Since the liquid crystal display panel 510 is the same as that described with reference to FIG. 7, detailed description is omitted.

The backlight unit 570 includes a plurality of light emitting element modules 523, a reflective sheet 524, a lower chassis 530 housing the light emitting element module 523 and the reflective sheet 524, A plurality of optical films 560, and a diffuser plate 540 disposed on the diffuser plate 540. [

The light emitting device module 523 may include a PCB substrate 521 for mounting a plurality of light emitting device packages 522 and a plurality of light emitting device packages 522 to form an array.

The reflection sheet 524 reflects light generated from the light emitting device package 522 in a direction in which the liquid crystal display panel 510 is positioned, thereby improving light utilization efficiency.

The light generated from the light emitting device module 523 is incident on the diffusion plate 540 and the optical film 560 is disposed on the diffusion plate 540. The optical film 560 may include a diffusion film 566, a prism film 550, and a protective film 564.

Here, the illumination device 300 and the liquid crystal display devices 400 and 500 may be included in the illumination system. In addition, the illumination device may include a light emitting device package and an illumination device.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons 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 taken by way of illustration, It will be appreciated that various modifications and applications are possible without departing from the scope of the present invention. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (20)

A light emitting element;
A body forming a cavity on the lead frame on which the light emitting element is disposed, the body having the inner surface of the cavity and the lead frame forming a first inclination angle; And
And a moisture control dam contacting the inner surface of the cavity and the lead frame and forming a second inclination angle with the lead frame,
Wherein the lead frame includes a first lead frame in which the light emitting device is disposed and a first groove is formed adjacent to a first inner side surface of the cavity and a first lead frame spaced apart from the first lead frame, And a second lead frame having a second groove formed adjacent to a second inner side surface of the inner side surface,
Wherein the moisture control dam includes a first moisture control dam in contact with an inner surface of the first groove and a second moisture control dam in contact with an inner surface of the second groove,
The vertical height of the first and second moisture control dams is 0.3 to 0.7 times the vertical height of the first and second inner surfaces,
Wherein the first moisture control dam includes a first surface exposed in the cavity direction,
Wherein the second moisture control dam is exposed in the cavity direction and includes a second surface facing the first surface,
Wherein the first surface has the second inclination angle and the second surface has a third inclination angle with the lead frame unlike the second inclination angle,
Wherein the first and second lead frames are provided with first and second holes through which an injection material flows to form the body. delete The method of claim 1, wherein the width of the first groove
The width of the second groove is equal to or larger than the width of the second groove,
Wherein a depth of at least one of the first and second grooves is 0.3 to 0.8 times the thickness of the lead frame,
The depth of the first groove
1 mm to 2 mm. delete delete The method according to claim 1 or 3,
The first groove
A first distance from the light emitting element,
The second groove
A second distance from the light emitting element,
The first distance,
Is equal to or longer than the second distance,
The first groove
A third distance from the first inner side,
The second groove
A fourth distance from the second inner side,
The sum of the first and third distances is calculated as follows:
And a sum of the second and fourth distances. delete delete delete delete 4. The system of claim 1 or 3, wherein the first and second moisture control dams
Have the same shape, have different sizes,
Wherein at least one of the first and second surfaces comprises:
And is parallel to an inner surface of the cavity. delete delete delete The water control dam according to claim 1 or 3,
It is made of metal,
The moisture control dam comprises:
Ag, Au, Pt, Al, Cu, and Pb,
The second inclination angle may be,
The first inclination angle being equal to the first inclination angle,
Or greater than the first inclination angle. delete delete The method according to claim 1 or 3,
And a resin filled in the cavity,
The resin material,
A phosphor, and a light diffusing material,
The above-
And at least two or more kinds of phosphors. delete An illumination system comprising the light emitting device package according to any one of claims 1 to 3.

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