Light-emitting device package

A light-emitting device package is provided including: a package substrate and a light-emitting device mounted on the package substrate. The package substrate includes first and second conductive regions each having a portion overlapping the light-emitting device. An electrode separator extends across the package substrate while penetrating the package substrate between the first and second conductive regions to electrically separate the first and second conductive regions from each other. A stress release portion surrounds at least a portion of each of the first and second conductive regions at an edge part of the package substrate. The stress release portion has different widths on both sides of the electrode separator interposed therebetween.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of Korean Patent Application No. 10-2012-0135565, filed on Nov. 27, 2012, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.

TECHNICAL FIELD

The disclosure relates to a light-emitting device package, and more particularly, to a light-emitting device package including a package substrate having an electrode separator.

BACKGROUND

A light-emitting diode (LED) is a semiconductor light-emitting device for converting an electrical signal to light through a PN-junction of a compound semiconductor. Along with the spread of the usage field of an LED over various fields, such as an indoor/outdoor lighting field, a vehicle headlight field, display device back-light unit (BLU) field, a medical equipment field, and so forth, it is necessary to develop an LED package having a structure capable of securing reliability and durability of a product with cost-effective materials.

SUMMARY

The disclosure provides a light-emitting device package having a structure capable of securing reliability and durability of a product.

According to an aspect of the disclosure, there is provided a light-emitting device package including a package substrate and a light-emitting device mounted on the package substrate. The package substrate includes first and second conductive regions each having a portion overlapping the light-emitting device. An electrode separator extends across the package substrate while penetrating the package substrate between the first and second conductive regions to electrically separate the first and second conductive regions from each other. A stress release portion surrounds at least a portion of each of the first and second conductive regions at an edge part of the package substrate. The stress release portion has different widths on both sides of the electrode separator interposed therebetween.

According to another aspect of the disclosure, there is provided a light-emitting device package. The package substrate includes first and second conductive regions, which are separated from each other by an electrode separator, and a stress release portion surrounding at least a portion of each of the first and second conductive regions. A light-emitting device overlaps the first and second conductive regions and extends across the electrode separator. The stress release portion includes a first stress release portion, which has a first width and surrounds at least a portion of the first conductive region, and a second stress release portion, which has a second width that is wider than the first width and surrounds at least a portion of the second conductive region.

According to another aspect of the disclosure, a method of manufacturing a light-emitting package is provided comprising steps of forming first and second conductive regions on a package substrate and forming an electrode separator between the first and second conductive regions to electrically separate the first and second conductive regions from each other. A stress release portion is formed surrounding at least a portion of each of the first and second conductive regions at an edge part of the package substrate and having different widths on both sides of the electrode separator interposed therebetween, and a light-emitting device is mounted on the package substrate.

DETAILED DESCRIPTION

Exemplary embodiments of the disclosure will now be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements, and thus their repetitive description will be omitted.

The embodiments are provided to describe the disclosure more fully to one of ordinary skill in the art. The disclosure, however, may be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the disclosure to one of ordinary skill in the art.

Although terms, such as ‘first’ and ‘second’, are used to describe various members, regions, layers, parts and/or elements, it is obvious that these members, regions, layers, parts and/or elements cannot be limited by the terms. The terms do not indicate a specific sequence, top and bottom, or superior and inferior and are only used to classify a certain member, region, part, or element from another member, region, part, or element. Therefore, a first member, region, part, or element to be described below can be named a second member, region, part, or element without leaving the introduction of the disclosure. For example, the first element can be named the second element without departing from the scope of the disclosure, and likewise the second element can be named the first element.

All terms used herein including technical or scientific terms have the same meaning as those generally understood by one of ordinary skill in the art unless they are defined otherwise. It should be understood that terms generally used, which are defined in a dictionary, have the same meaning as in a context of related technology, and the terms are not understood as excessively formal meaning unless they are clearly defined in the application.

When a certain embodiment can be differently implemented, a specific process sequence may be performed differently from a described sequence. For example, two sequential processes to be described below may be substantially performed at the same time or may be performed in a sequence that is opposite to the described sequence.

In the accompanying drawings, modifications of shown shapes may be predicted according to, for example, a manufacturing technique and/or tolerance. Therefore, the embodiments of the disclosure should not be construed as being limited to specific shapes of regions shown in the specification, and should include, for example, a change in shapes caused in a manufacturing process.

FIG. 1Ais a plan view of a main structure of a light-emitting device package100according to an embodiment of the disclosure.FIG. 1Bis a cross-sectional view of line B-B′ ofFIG. 1A.

Referring toFIGS. 1A and 1B, the light-emitting device package100may include a package substrate110and a light-emitting device150mounted on the package substrate110. The package substrate110supports the light-emitting device150. The package substrate110may be connected to an external printed circuit board (PCB, not shown).

The package substrate110includes first and second conductive regions112and114each having a portion overlapping the light-emitting device150, an electrode separator120for electrically separating the first and second conductive regions112and114from each other, and a stress release portion130formed at an edge part of the package substrate110.

To electrically connect the light-emitting device150to the first and second conductive regions112and114, a first conductive bonding layer162and a second conductive bonding layer164are interposed between the light-emitting device150and the first and second conductive regions112and114, respectively. Any one of a cathode and an anode of the light-emitting device150may be connected to the first conductive region112via the first conductive bonding layer162, and the other one thereof may be connected to the second conductive region114via the second conductive bonding layer164. In some embodiments, the cathode of the light-emitting device150may be connected to the first conductive region112, and the anode thereof may be connected to the second conductive region114. In some other embodiments, the cathode of the light-emitting device150may be connected to the second conductive region114, and the anode thereof may be connected to the first conductive region112.

Areas of the first and second conductive regions112and114in the package substrate110may be the same or different from each other. In some embodiments, the area of the second conductive region114may be greater than the area of the first conductive region112.

The package substrate110may include a metal having higher thermal conductivity than that of plastic or ceramic. To maximize a heat radiation characteristic of the package substrate110, the first and second conductive regions112and114may be formed of a metal. In some embodiments, the first and second conductive regions112and114may be formed of at least one material selected from the group consisting of aluminum (Al), copper (Cu), magnesium (Mg), zinc (Zn), titanium (Ti), tantalum (Ta), hafnium (Hf), niobium (Nb), aluminum nitride (AlN), silicon carbide (SiC), and an alloy of them.

When the first and second conductive regions112and114are formed of a metal, the first and second conductive regions112and114may support the light-emitting device150and may also function as a heat sink for radiating heat generated by the light-emitting device150.

In some embodiments, the light-emitting device150may include a light-emitting diode (LED) chip. The LED chip may emit light of blue, green, red, or the like according to a type of a compound semiconductor forming the LED chip. Alternatively, the LED chip may emit ultraviolet (UV) rays. In some other embodiments, the light-emitting device150may include a UV optical diode chip, a laser diode chip, or an organic LED (OLED) chip. However, according to the disclosure, the light-emitting device150is not limited to the illustrations and may include various optical devices.

The electrode separator120extends across the package substrate110in a first direction (the Y-axis direction inFIG. 1A) while penetrating the package substrate110in a thickness direction of the package substrate110by being interposed between the first and second conductive regions112and114.

The stress release portion130alleviates a thermal stress of the light-emitting device150. The stress release portion130extends along the edge part of the package substrate110to fully surround the first and second conductive regions112and114. However, the disclosure is not limited thereto. In some embodiments, the stress release portion130may extend along a portion of the edge part of the package substrate110to surround a portion of the first conductive region112or a portion of the second conductive region114. The stress release portion130extends with a width wider than that of the electrode separator120.

In some embodiments, the electrode separator120and the stress release portion130may be formed of a same material, but the disclosure is not limited thereto.

In some embodiments, the electrode separator120and the stress release portion130may be formed of an insulative metal oxide film. For example, the electrode separator120and the stress release portion130may be formed of an insulative metal oxide film obtained by anodizing Al, Mg, Zn, Ti, Ta, Hf, or Nb. In an illustrative process to obtain the electrode separator120and the stress release portion130formed of a metal oxide film obtained by an anodizing treatment, a metal substrate is prepared, and a region to be separated from the metal substrate may be selectively anodized. For the anodizing treatment, a separate jig may be produced to directly perform the anodizing treatment. Alternatively, a desired mask pattern is formed on the metal substrate, and regions partially exposed through the mask pattern from the metal substrate may be anodized. After the anodizing treatment, the mask pattern is removed, and an electrolytic grinding process may be further performed to adjust surface illuminations of the surface of the metal substrate, which is exposed by removing the mask pattern, and the anodizing-treated surface. The portion of the metal substrate, which is exposed by removing the mask pattern, may be used for the first and second conductive regions112and114.

The electrode separator120may function to electrically separate the first and second conductive regions112and114from each other and may also function to radiate heat generated by the light-emitting device150to the outside. The stress release portion130may function to alleviate a thermal stress of the light-emitting device150and may also function to radiate heat generated by the light-emitting device150to the outside.

In some other embodiments, the electrode separator120and the stress release portion130may be formed of an insulation material without a metal. For example, the electrode separator120and the stress release portion130may be formed of an insulation resin. In some embodiments, the insulation resin may include epoxy, polyphthalamide (PPA), liquid crystal polymer (LCP), polyphenylene sulfide (PPS), or polyetheretherketone (PEEK). In an illustrative embodiment to form the electrode separator120and the stress release portion130formed of an insulation material without a metal, processes of forming a mask pattern on a metal substrate, forming a hole by etching a region that is exposed through the mask pattern, and filling the insulation material inside the hole may be performed.

Although materials forming the electrode separator120and the stress release portion130and methods of forming the electrode separator120and the stress release portion130have been illustrated, according to the disclosure, a material and a forming method of the electrode separator120and the stress release portion130are not limited to the illustrations and may be variously modified and changed.

The electrode separator120is formed at a location shifted towards one side from the center of the package substrate110. Thus, areas of both sides of the package substrate110based on the electrode separator120are different from each other. The first conductive region112is located at a part having a relatively small area in the package substrate110divided into two parts by the electrode separator120, and the second conductive region114is located at a part having a relatively large area in the package substrate110divided into the two parts by the electrode separator120.

The stress release portion130includes a first stress release portion132extending in parallel to the electrode separator120at the part having a relatively small area in the package substrate110divided into the two parts by the electrode separator120, and a second stress release portion134extending in parallel to the electrode separator120at the part having a relatively large area. The first and second stress release portions132and134are located at both sides of the light-emitting device150interposed therebetween. The first stress release portion132surrounds a portion of the first conductive region112, and the second stress release portion134surrounds a portion of the second conductive region114. The first and second stress release portions132and134are integrally connected by a connection part136extending therebetween. Although it is shown inFIG. 1Athat the first and second stress release portions132and134are connected in parallel to each other, the disclosure is not limited thereto.

The first and second stress release portions132and134have different widths. In particular, the first and second stress release portions132and134may have different widths at a portion at which the first and second stress release portions132and134cross a certain direct line passing through the light-emitting device150in a second direction (the X-axis direction). As shown inFIGS. 1A and 1B, the first stress release portion132may extend in the first direction (the Y-axis direction ofFIG. 1A) with a first width W1near one side of the light-emitting device150, and the second stress release portion134may extend in the first direction with a second width W2that is wider than the first width W1near the other side of the light-emitting device150.

In the second direction (the X-axis direction), each of the first width W1of the first stress release portion132and the second width W2of the second stress release portion134is wider than a width W3of the electrode separator120.

In certain embodiments, on the package substrate, the first stress release portion132, the second stress release portion134, and the electrode separator120extend in parallel to each other.

The light-emitting device150is disposed to cross the electrode separator120so as to overlap the first and second conductive regions112and114. Although an overlap area of the light-emitting device150and the second conductive region114may be greater than an overlap area of the light-emitting device150and the first conductive region112, the disclosure is not limited thereto.

When the stress release portion130does not exist on the package substrate110including the electrode separator120, the areas of the first and second conductive regions112and114may be further expanded as much as the area occupied by the stress release portion130. In this case, a difference between the areas respectively occupied by the first and second conductive regions112and114located at both sides of the electrode separator120interposed therebetween may be greater than the former case. Thus, a thermal stress applied from the first and second conductive regions112and114to the light-emitting device150may be greater than the former case.

In particular, in a bonding process to attach the light-emitting device150onto the package substrate110, when a temperature of the package substrate110increases, because thermal expansion coefficients of the first and second conductive regions112and114and the electrode separator120are different from each other, a relatively large thermal stress may be applied from the package substrate110to the light-emitting device150. For example, when the light-emitting device150is fixed onto the package substrate110by forming the first conductive bonding layer162and the second conductive bonding layer164by a eutectic die attach process, a temperature of the package substrate110may increase to about 300° C. or more. At this time, a relatively large thermal stress may be applied to the light-emitting device150due to the thermal expansion coefficient difference between the first and second conductive regions112and114and the electrode separator120, and as a result, a crack may occur at a part of the light-emitting device150, which is adjacent to the first conductive bonding layer162and the second conductive bonding layer164, thereby forming bad product in a light-emitting device package manufacturing process. In addition, during the use of a product including the light-emitting device package100, abnormalities, such as cracks, may be caused by a thermal stress applied from the package substrate110of the light-emitting device package100to the light-emitting device150, thereby reducing a product life span.

However, according to some embodiments according to the disclosure, the light-emitting device package100includes the stress release portion130surrounding the first and second conductive regions112and114on the package substrate110including the first and second conductive regions112and114. In particular, to reduce the difference between the area occupied by the first conductive region112and the area occupied by the second conductive region114, the second stress release portion134having a width wider than that of the first stress release portion132is formed around the second conductive region114. Thus, the influence of heat generated by the first and second conductive regions112and114may be evenly spread over the whole light-emitting device150. Accordingly, compared with a case where the stress release portion130does not exist, the thermal stress at the light-emitting device150may be reduced, and as a result, crack occurrence, life span reduction, and the like due to the thermal stress may be prevented.

The first conductive bonding layer162and the second conductive bonding layer164may be formed of a metallic material having excellent electric conductivity and adhesion properties. In some embodiments, each of the first conductive bonding layer162and the second conductive bonding layer164may be formed of gold (Au), tin (Sn), lead (Pb), silver (Ag), indium (In), germanium (Ge), silicon (Si), or a combination of them. For example, the first conductive bonding layer162and the second conductive bonding layer164may be formed of an Au—Sn alloy, a Pb—Ag—In alloy, a Pb—Ag—Sn alloy, a Pb—Sn alloy, an Au—Ge alloy, an Au—Si alloy, or Au. The first conductive bonding layer162and the second conductive bonding layer164may be formed using the eutectic die attach process.

AlthoughFIGS. 1A and 1Bshow a structure using the first conductive bonding layer162and the second conductive bonding layer164to electrically connect the light-emitting device150to the package substrate110, the disclosure is not limited thereto. For example, to electrically connect the light-emitting device150to the package substrate110, conductive wires or solder bumps may be used instead of the first conductive bonding layer162and the second conductive bonding layer164.

The light-emitting device package100may further include a zener diode160mounted on any one of the first and second conductive regions112and114. AlthoughFIG. 1Ashows a structure in which the zener diode160is attached onto the second conductive region114, the disclosure is not limited thereto, and various modifications may be performed.

The zener diode160may function to protect the light-emitting device150from static electricity, which may occur around the light-emitting device package100, a sudden change in a voltage supplied to the light-emitting device150, or the like. The zener diode160is a diode having the property that the diode is turned on in a reverse direction if a potential difference equal to or greater than a zener voltage (breakdown voltage) is applied in the reverse direction. Any one of an anode and a cathode of the zener diode160may be directly attached onto the second conductive region114to be electrically connected to the second conductive region114. The other one of the anode and the cathode of the zener diode160may be electrically connected to the first conductive region112through a wire162. That is, the zener diode160may be connected in parallel to the light-emitting device150. Accordingly, when an overvoltage occurs at the light-emitting device package100, current may flow through the zener diode160, thereby protecting the light-emitting device150from the overvoltage. In some embodiments, the light-emitting device package100may not include the zener diode160.

FIGS. 2A to 2Dare perspective views according to a process sequence to describe an illustrative method of manufacturing the package substrate110illustrated inFIGS. 1A and 1B.

Referring toFIG. 2A, a metal substrate M1is prepared, and an insulative metal oxide film51having a predetermined thickness is formed on one surface of the metal substrate M1by an anodizing process to form a sub-structure U1having a layered structure of the metal substrate M1and the insulative metal oxide film51.

Referring toFIG. 2B, a plurality of sub-structures U2, U3, . . . , UN, in which first metal oxide films S2, S3, . . . , SN are respectively formed on one surfaces of metal substrates M2, M3, . . . , MN, are further formed using a similar process to that described with reference toFIG. 2A, and the plurality of sub-structures U1, U2, U3, . . . , UN are sequentially bonded in series.

The metal substrate M1may be formed of Al, Mg, Zn, Ti, Ta, Hf, or Nb. In some embodiments, an adhesive may be used to increase a bonding force when the plurality of sub-structures U1, U2, U3, . . . , UN are bonded, but the disclosure is not limited thereto.

At least some of the metal oxide films S1, S2, S3, . . . , SN in the plurality of sub-structures U1, U2, U3, . . . , UN may have different thicknesses. For example, the thickness of each of the metal oxide films S1, S2, S3, . . . , SN may be determined by considering the width W3of the electrode separator120and the width of the stress release portion130included in the package substrate110of the light-emitting device package100shown inFIGS. 1A and 1B.

Referring toFIG. 2C, the anodizing process is performed for exposed surfaces of the metal substrates M1, M2, M3, . . . , MN from the result ofFIG. 2Bto form a structure10in which a second metal oxide film X1is formed on the exposed surfaces.

Referring toFIG. 2D, in certain embodiments, the structure10is cut along cutting lines marked as broken lines CL1extending in the X-axis direction, resulting in a plurality of package substrates of the same size, each having a part marked with a quadrangle SUB1illustrated by alternating long and short dashed lines as the upper surface. Each of the plurality of package substrates may be used as the package substrate110shown inFIGS. 1A and 1B.

FIGS. 3A to 3Dare plan views according to a process sequence to describe another illustrative method of manufacturing the package substrate110illustrated inFIGS. 1A and 1B.

Referring toFIG. 3A, a metal substrate20is prepared, a mask pattern22having a desired pattern shape is formed on the upper surface of the metal substrate20, and a portion of the upper surface of the metal substrate20is exposed through the mask pattern22.

The metal substrate20may be formed of Al, Mg, Zn, Ti, Ta, Hf, or Nb. The mask pattern22may be formed of a photoresist film.

Referring toFIG. 3B, the upper surface of the metal substrate20, which is exposed through the mask pattern22, is anodized to form an insulative metal oxide film24penetrating the metal substrate20.

The insulative metal oxide film24may form the electrode separator120and the stress release portion130included in the package substrate110of the light-emitting device package100shown inFIGS. 1A and 1B.

Referring toFIG. 3C, the mask pattern22is removed to expose a plurality of conductive regions20A of the metal substrate20.

In some embodiments, to match roughness of the surfaces of the plurality of conductive regions20A with roughness of the surface of the insulative metal oxide film24, the surface roughness may be adjusted using an electrolytic grinding method or the like.

Referring toFIG. 3D, a part including the insulative metal oxide film24is cut along cutting lines marked with broken lines CL2extending in the X-axis direction and broken lines CL3extending in the Y-axis direction to form a plurality of package substrates each having a part marked with a quadrangle SUB2depicted by an alternating long and short dashed lines as the upper surface.

Each of the plurality of package substrates may be used as the package substrate110shown inFIGS. 1A and 1B. The plurality of conductive regions20A may form the first and second conductive regions112and114included in the package substrate110of the light-emitting device package100shown inFIGS. 1A and 1B.

FIGS. 4 to 9are plan views of main structures of light-emitting device packages200,300,400,500,600, and700according to other embodiments of the disclosure.

InFIGS. 4 to 9, like reference numerals inFIGS. 1A and 1Bdenote like members, and a detailed description thereof is omitted here for simplification of description. Although the zener diode160and the wire162shown inFIGS. 1A and 1Bare omitted inFIGS. 4 to 9, the zener diode160and the wire162may be further included within the scope of the disclosure.

Referring toFIG. 4, the light-emitting device package200includes a package substrate210. The package substrate210is almost similar to the package substrate110shown inFIGS. 1A and 1Bexcept that a stress release portion230is included instead of the stress release portion130.

The stress release portion230extends along an edge part of the package substrate210to fully surround the first and second conductive regions112and114. The stress release portion230includes a first stress release portion232formed at a part having a relatively small area in the package substrate210divided into two parts by the electrode separator120and a second stress release portion234formed at the part having a relatively large area. Each of the first and second stress release portions232and234has a width wider than that of the electrode separator120.

The first stress release portion232includes a first part232A, which extends in the first direction (the Y-axis direction) to be parallel to the electrode separator120and surrounds a portion of the first conductive region112, and a second part232B and a third part232C extending in the second direction (the X-axis direction) from the first part232A and surrounding the other portion of the first conductive region112. Each of the first, second, and third parts232A,232B, and232C of the first stress release portion232has a width wider than the width W3of the electrode separator120. The first part232A of the first stress release portion232has a first width W21A wider than the width W3in the second direction (the X-axis direction), and the second and third parts232B and232C of the first stress release portion232have a second width W21B and a third width W21C wider than the first width W21A in the first direction (the Y-axis direction), respectively.

The second stress release portion234includes a first part234A, which extends in the first direction (the Y-axis direction) to be parallel to the electrode separator120and surrounds a portion of the second conductive region114, and a second part234B and a third part234C extending in the second direction (the X-axis direction) from the first part234A and surrounding the other portion of the second conductive region114. The first, second, and third parts234A,234B, and234C of the second stress release portion234have first, second, and third widths W22A, W22B, and W22C wider than the first width W21A of the first part232A of the first stress release portion232, respectively.

The second part232B of the first stress release portion232and the second part234B of the second stress release portion234are integrally connected to each other. The second width W21B of the second part232B of the first stress release portion232and the second width W22B of the second part234B of the second stress release portion234may be the same but are not limited thereto. The third part232C of the first stress release portion232and the third part234C of the second stress release portion234are integrally connected to each other. The third width W21C of the third part232C of the first stress release portion232and the third width W22C of the third part234C of the second stress release portion234may be the same but are not limited thereto.

Referring toFIG. 5, the light-emitting device package300includes a package substrate310. The package substrate310includes a stress release portion330. The stress release portion330has substantially the same configuration as the stress release portion130shown inFIGS. 1A and 1Bexcept that a protrusion part334P protruding towards the light-emitting device150from a portion of a second stress release portion334.

By properly adjusting a size of the protrusion part334P, the influence of heat from the first and second conductive regions112and114, which affects the light-emitting device150, can be relatively uniformly spread. Accordingly, with the protrusion part334P, a thermal stress at the light-emitting device150can be reduced.

Referring toFIG. 6, the light-emitting device package400includes a package substrate410. The package substrate410includes a stress release portion430. The stress release portion430extends along a portion of an edge part of the package substrate410to surround only a portion of the first and second conductive regions112and114. The stress release portion430includes first and second stress release portions432and434, which are separated from each other by interposing the light-emitting device150therebetween. The first stress release portion432surrounds a portion of the first conductive region112, and the second stress release portion434surrounds a portion of the second conductive region114. The first and second stress release portions432and434have widths W41and W42wider than the width W3of the electrode separator120in the X-axis direction, respectively. In addition, the width W42of the second stress release portion434is wider than the width W41of the first stress release portion432.

Referring toFIG. 7, the light-emitting device package500includes a package substrate510. The package substrate510includes a stress release portion530. The stress release portion530extends along an edge part of the package substrate510to fully surround first and second conductive regions512and514. The stress release portion530includes a first stress release portion532formed at a part having a relatively small area in the package substrate510divided into two parts by an electrode separator520and a second stress release portion534formed at the part having a relatively large area. The first and second stress release portions532and534are integrally connected to each other through a connection part536extending therebetween. Although it is shown inFIG. 7that the first and second stress release portions532and534are connected in parallel to each other, the disclosure is not limited thereto.

The first and second stress release portions532and534have widths W51and W52wider than a width W53of the electrode separator520in a width direction (the X-axis direction) perpendicular to a length direction (the Y-axis direction), respectively. In addition, the width W52of the second stress release portion534is wider than the width W51of the first stress release portion532.

The first and second stress release portions532and534extend parallel to each other, and the electrode separator520extends in a direction crossing the extending direction of the first and second stress release portions532and534.

Referring toFIG. 8, the light-emitting device package600includes a package substrate610. The package substrate610includes a stress release portion630. The stress release portion630extends along an edge part of the package substrate610to fully surround first and second conductive regions612and614. The stress release portion630includes a first stress release portion632forming a portion of the edge part of the package substrate610and a second stress release portion634forming the other portion of the edge part of the package substrate610.

The stress release portion630further includes a plurality of protrusion parts634P protruding towards the light-emitting device150from a portion of the second stress release portion634. By properly adjusting sizes of the plurality of protrusion parts634P, the influence of heat from the first and second conductive regions612and614, which affects the light-emitting device150, can be relatively uniformly spread. Accordingly, with the plurality of protrusion parts634P, a thermal stress at the light-emitting device150can be reduced. AlthoughFIG. 8shows that the plurality of protrusion parts634P have the same width W62, the disclosure is not limited thereto, as each of the plurality of protrusion parts634P may have a different width.

Each of a width W61of the first stress release portion632and the width W62of each of the plurality of protrusion parts634P in a width direction perpendicular to a length direction of each of the plurality of protrusion parts634P is wider than a width W63of an electrode separator620. In addition, the width W62of each of the plurality of protrusion parts634P is wider than the width W61of the first stress release portion632. In some embodiments, each of the plurality of protrusion parts634P may have a different width.

Referring toFIG. 9, the light-emitting device package700includes a package substrate710. The package substrate710includes a stress release portion730. The stress release portion730extends along a portion of an edge part of the package substrate710to surround only a portion of first and second conductive regions712and714. The stress release portion730includes a first stress release portion732forming a portion of the edge part of the package substrate710and a second stress release portion734forming the other portion of the edge part of the package substrate710. The first and second stress release portions732and734are separated from each other by interposing the light-emitting device150therebetween.

The first stress release portion732surrounds a portion of the first conductive region712, and the second stress release portion734surrounds a portion of the second conductive region714. The first and second stress release portions732and734have widths W71and W72wider than a width W73of an electrode separator720in a width direction perpendicular to a length direction of the first and second stress release portions732and734, respectively. In addition, the width W72of second stress release portion734is wider than the width W71of the first stress release portion732.

The package substrates210,310,410,510,610, and710of the light-emitting device packages200,300,400,500,600, and700shown inFIGS. 4 to 9may be manufactured using the method described with reference toFIGS. 2A to 2Dor the method described with reference toFIGS. 3A to 3D.

FIG. 10is a cross-sectional view of a main structure of a light-emitting device package800according to another embodiment of the disclosure. InFIG. 10, like reference numerals inFIGS. 1A and 1Bdenote like members, and a detailed description thereof is omitted here for simplification of description.

Referring toFIG. 10, the light-emitting device package800includes a lens part830surrounding the light-emitting device150mounted on the package substrate110. In some embodiments, the inside of the lens part830may be filled with a silicon resin, an epoxy resin, plastic, or glass. In some other embodiments, the lens part830may include a refraction member inside. The refraction member may refract or reflect light emitted by the light-emitting device150.

FIG. 11is a cross-sectional view of a main structure of a light-emitting device package900according to another embodiment of the disclosure. InFIG. 11, like reference numerals inFIGS. 1A,1B, and10denote like members, and a detailed description thereof is omitted here for simplification of description.

Referring toFIG. 11, the light-emitting device package900includes a wavelength conversion layer902covering the light-emitting device150and a reflection layer904covering the side surfaces of the light-emitting device150. The wavelength conversion layer902may convert a wavelength of light emitted by the light-emitting device150into another wavelength. AlthoughFIG. 11shows that the wavelength conversion layer902covers the upper surface of the light-emitting device150, the disclosure is not limited thereto. The wavelength conversion layer902may be formed to cover at least a portion of a light-emitting surface of the light-emitting device150. The wavelength conversion layer902may include a wavelength conversion material formed of a fluorescent substance or quantum dots. The fluorescent substance may include at least one of a yellow fluorescent substance, a green fluorescent substance, a red fluorescent substance, and a blue fluorescent substance.

The reflection layer904may be formed to cover a portion of the upper surface of the package substrate110and the side surfaces of the light-emitting device150. In some embodiments, the reflection layer904may include a low reflective resin and a light-reflecting filler spread inside the low reflective resin. Light orienting to the reflection layer904from the light-emitting device150may be reflected by the light-reflecting filler in the reflection layer904. The low reflective resin may be formed of an epoxy resin. The light-reflecting filler may be formed of a light reflective oxide, such as a titanium oxide (TiO2) or a silicon oxide (SiO2). In some other embodiments, the reflection layer904may be formed of only the low reflective resin. In this case, according to a light-incident angle, light from the light-emitting device150may travel through the inside of the low reflective resin or may be reflected towards the light-emitting device150.

FIG. 12is a cross-sectional view of a main structure of a light-emitting device package1000according to another embodiment of the disclosure. InFIG. 12, like reference numerals inFIGS. 1A and 1Bdenote like members, and a detailed description thereof is omitted here for simplification of description.

Referring toFIG. 12, the light-emitting device package1000may include a package body1012delimiting a cavity1010, a resin layer1020filling the cavity1010, and a lens part1030disposed on the package body1012and the resin layer1020. The package body1012may be formed of a transparent material. For example, the package body1012may be formed of a silicon resin, an epoxy resin, or glass.

The resin layer1020may include a transparent resin, such as a silicon resin or an epoxy resin. In some embodiments, the resin layer1020may include at least one type of a fluorescent substance or a dispersing agent. The fluorescent substance may include at least one of a yellow fluorescent substance, a green fluorescent substance, a red fluorescent substance, and a blue fluorescent substance.

The lens part1030may collect light emitted by the light-emitting device150. In some embodiments, at least a portion of the inside of the lens part1030may include a fluorescent substance or a color conversion material. When the fluorescent substance is included inside the lens part1030, a wavelength of the light emitted by the light-emitting device150may be converted. The lens part1030may be filled with a silicon resin, an epoxy resin, plastic, or glass.

In some embodiments, the resin layer1020and the lens part1030may be formed of a same material and may be formed as one body. In this case, the resin layer1020and the lens part1030may be formed at the same time.

FIG. 13is a cross-sectional view of a main structure of a light-emitting device package1100according to another embodiment of the disclosure. InFIG. 13, like reference numerals inFIGS. 1A,1B, and12denote like members, and a detailed description thereof is omitted here for simplification of description.

Referring toFIG. 13, the light-emitting device package1100has substantially the same configuration as the light-emitting device package1000shown inFIG. 12. However, a light-emitting device1050is mounted on the second conductive region114. A cathode and an anode of the light-emitting device1050may be connected to the first and second conductive regions112and114by bonding wires1062and1064, respectively. In some embodiments, the cathode of the light-emitting device1050may be connected to the first conductive region112, and the anode of the light-emitting device1050may be connected to the second conductive region114. In some other embodiments, the cathode of the light-emitting device1050may be connected to the second conductive region114, and the anode of the light-emitting device1050may be connected to the first conductive region112.

A first rear surface electrode1072and a second rear surface electrode1074electrically connectable to the first conductive region112and the second conductive region114are formed on the lower surface of the package substrate110, respectively. The first and second conductive regions112and114may respectively receive power from the outside via the first and second rear surface electrodes1072and1074and may supply driving power to the light-emitting device1050and the zener diode160(refer toFIG. 1A). The first and second rear surface electrodes1072and1074may be formed using a sputtering method, an electrolytic plating method, a non-electrolytic plating method, or a screen printing method. In some embodiments, the first and second rear surface electrodes1072and1074may be omitted.

FIG. 14is a top view of a dimming system1200including a light-emitting device package according to an embodiment of the disclosure. Referring toFIG. 14, the dimming system1200includes a light-emitting module1220and a power supply unit1230, which are disposed on a structure1210.

The light-emitting module1220includes a plurality of light-emitting device packages1224. The plurality of light-emitting device packages1224include at least one of the light-emitting device packages100,200,300,400,500,600,700,800,900,1000, and1100described with reference toFIGS. 1A to 13.

The power supply unit1230includes an interface1232for receiving power and a power controller1234for controlling power to be supplied to the light-emitting module1220. The interface1232may include a fuse for cutting off an overcurrent and an electronic wave shielding filter for shielding an electronic wave obstacle signal. The power controller1234may include a rectification unit and an equalization unit for converting an alternating current (AC) to a direct current (DC) when AC power is input as power, and a constant voltage controller for converting a DC voltage to a voltage suitable for the light-emitting module1220. The power supply unit1230may include a feedback circuit device for comparing the intensity of light emitted by each of the plurality of light-emitting device packages1224with a preset light intensity and a memory device for storing information, such as a desired brightness, color rendering, and so forth.

The dimming system1200may be used for backlight units used in display devices, such as liquid crystal display devices having an image panel and the like, indoor lighting devices, such as lamps, flat board lighting, and the like, and outdoor lighting devices, such as street lights, sign boards, street signs, and the like. In addition, the dimming system1200may be used for various lighting devices for various traffic means, e.g., lighting devices for vehicles, vessels, and airplanes, electric home appliances, such as TVs, refrigerators, and so forth, and medical equipment.

FIG. 15is a block diagram of an optical processing system1300including a light-emitting device package according to an embodiment of the disclosure. Referring toFIG. 15, the optical processing system1300includes a camera system1310, a light source system1320, and a data processing and analyzing system1330.

The camera system1310may be used by directly contacting an object to be optically processed or by being disposed to orient to the object to be optically processed in a state of being apart by a predetermined distance from the object to be optically processed. In some embodiments, the object to be optically processed may be biological tissue, such as a skin or a part to be treated. The camera system1310is connected to the light source system1320through a light guide1312. The light guide1312may include an optical fiber light guide or a liquid light guide capable of optical transmission.

The light source system1320provides light to be irradiated on the object to be optically processed through the light guide1312. The light source system1320includes at least one of the light-emitting device packages100,200,300,400,500,600,700,800,900,1000, and1100described with reference toFIGS. 1A to 13. In some embodiments, the light source system1320may generate and oscillate ultraviolet rays and irradiate the ultraviolet rays on biological tissue, such as a skin or a disease part.

The camera system1310is connected to the data processing and analyzing system1330through a cable1314. An image signal output from the camera system1310may be transmitted to the data processing and analyzing system1330through the cable1314. The data processing and analyzing system1330includes a controller1332and a monitor1334. The data processing and analyzing system1330may process, analyze, and store the image signal transmitted from the camera system1310.

The optical processing system1300shown inFIG. 15may be applied to various application fields, such as skin diagnosis devices, medical treatment devices, sterilization devices, disinfection devices, cleaning devices, surgical supplies, cosmetic medical devices, lighting devices, information sensing devices, and the like.