(19)
(11)EP 2 479 809 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
11.09.2019 Bulletin 2019/37

(21)Application number: 11180993.5

(22)Date of filing:  13.09.2011
(51)International Patent Classification (IPC): 
H01L 33/48(2010.01)
H01L 33/62(2010.01)

(54)

Mold structure for light-emitting diode package

Formstruktur für ein Gehäuse einer Leuchtdiode

Structure de moule pour boîtier de diode électroluminescente


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 20.01.2011 KR 20110005981

(43)Date of publication of application:
25.07.2012 Bulletin 2012/30

(73)Proprietor: Samsung Electronics Co., Ltd.
Suwon-si, Gyeonggi-do, 443-742 (KR)

(72)Inventors:
  • Choi, Sun
    Seoul (KR)
  • Park, Jong-jin
    Daejeon (KR)

(74)Representative: Grünecker Patent- und Rechtsanwälte PartG mbB 
Leopoldstraße 4
80802 München
80802 München (DE)


(56)References cited: : 
JP-A- H11 345 913
US-A1- 2010 133 554
US-A1- 2009 242 914
US-B1- 6 242 287
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    CROSS-REFERENCE TO RELATED APPLICATIONS



    [0001] This application claims the benefit of Korean Patent Application No. 10-2011-0005981, filed on January 20, 2011, in the Korean Intellectual Property Office.

    BACKGROUND


    1. Field



    [0002] The present disclosure relates to mold structures for a light-emitting diode (LED) package having a notch formed at at least an end of a package mold, such that a trimming die may be inserted thereto.

    2. Description of the Related Art



    [0003] A light-emitting diode (LED) is a semiconductor light-emitting device which converts electric signals into light. Compared to other light-emitting devices, a LED has relatively long lifespan and may be driven at a relatively low voltage. Recently, illumination devices, which employ white diodes having high brightness, have been replacing conventional light-emitting devices.

    [0004] FIGS. 1A and 1B are diagrams showing the structure of a general LED package 10. Referring to FIGS. 1A and 1B, the general LED package 10 is fabricated by forming a package mold 11 in which a single cavity 12 is formed, mounting a LED 13, which is fabricated in advance, on a lead frame in the package mold 11, wire-bonding an electrode of the LED 13 and an electrode connecting unit of the package mold 11, and applying a phosphor and/or a light transmitting resin on a surface of the LED 13.

    [0005] Along with the miniaturization of electronic devices employing LEDs, the sizes of LED packages are also being gradually reduced, and thus, higher precision is required for the fabrication of a package mold and a lead frame included therein. However, since there is a minimum required size in a conventional method of fabricating a package mold, there is a limit to the miniaturization of package molds by using the conventional method of fabricating a package mold. For example, as shown in FIG. 1A, an electrode lead 14 for supplying power to the general LED package 10 protrudes out of the package mold 11 in a bent shape. To form the electrode lead 14 in a bent shape, a separate bending die (not shown) is arranged at the region A and pressure is applied thereto. Therefore, it is necessary to secure a width d for arranging the separate bending die, which prevents the reduction in the size of an LED package. Furthermore, the region B1 is a portion at which a mold for a target package is fixed while a plurality of package molds are pressed in a mold for mass production, and is a portion to be cut later. For surface processing the region B1, a separate trimming die is arranged behind the package mold 11 as shown in FIG. 1B and pressure is applied thereto. However, the space may also interrupt the reduction in the size of a LED package.

    [0006] US 2010/133554 A1 discloses a light emission package in which a cavity is formed to mount LEDs therein. The package exhibits a corner notch and recesses in exterior side walls.

    [0007] JP H 11-345913 A discloses a mold structure in which the dimension of an opening formed by a recess in an upper mold die is larger than the dimension of an opening formed by a recess in a lower mold die so that an overhang section is formed around the peripheral edge of the opening in the upper mold die.

    [0008] It is the object of the present invention to provide an improved mold structure for an LED package.

    [0009] The object is solved by the subject matter of the independent claim. Preferred embodiments of the present invention are defined by the dependent claims.

    SUMMARY



    [0010] Provided are mold structures for a light-emitting diode (LED) package having a notch formed at at least an end portion of a package mold, such that a trimming die may be inserted thereto.

    [0011] Provided are mold structures for a LED package having an electrode lead formed to be closely attached to two opposite ends of a die for a package.

    [0012] Additional aspects will be set forth in part in the description which follows and, in part, will be apparent from the description, or may be learned by practice of the presented embodiments.

    [0013] According to an aspect of the present invention, a mold structure for a light-emitting diode (LED) package, the mold structure includes a package mold, in which a cavity is formed to mount a LED therein; and a notch, which is formed at at least an end portion of the package mold.

    [0014] The notch may be formed at a region at the opposite side of the cavity to which the LED of the package mold is mounted.

    [0015] The notch may be a region to which a trimming die is inserted.

    [0016] The mold structure may further include a protrusion, which is formed at a location corresponding to the notch, where the protruding length of the protrusion may be less than 0.4 mm.

    [0017] The mold structure may further include an electrode lead, which is formed at at least an end portion of the package mold and is closely attached to the package mold.

    [0018] A gap between the package mold and the electrode lead may be narrower than 0.4 mm.

    [0019] The mold structure for a LED package may be a mold structure for a surface mount device (SMD) type LED package.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0020] These and/or other aspects will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

    FIGS. 1A and 1B are diagrams showing the structure of a general LED package;

    FIGS. 2A and 2B are schematic diagrams showing a mold structure for a light-emitting diode (LED) package, according to an embodiment of the present invention;

    FIG. 3 shows that a trimming die is inserted to the rear of the mold structure for the LED package, according to an embodiment of the present invention, and a metal end is cut;

    FIGS. 4A and 4B show a process for bending an electrode lead of a mold structure for a LED package, according to an embodiment of the present invention; and

    FIG. 5 is a diagram showing that a LED is mounted to a mold structure for a LED package according to an embodiment of the present invention.


    DETAILED DESCRIPTION



    [0021] The present invention will now be described more fully with reference to the accompanying drawings, in which exemplary embodiments of the invention are shown. In the drawings, the thicknesses of layers and regions are exaggerated for clarity.

    [0022] FIGS. 2A and 2B are schematic diagrams showing a mold structure for a light-emitting diode (LED) package 20, according to an embodiment of the present invention.

    [0023] Referring to FIGS. 2A and 2B, in the mold structure for the LED package 20, according to an embodiment of the present invention, a package mold 21, in which a cavity for mounting a LED therein is formed, and a notch 22, which is formed at at least an end portion of the package mold 21 and to which a trimming die is to be inserted thereto. The notch 22 may be formed at a region B2 corresponding to a region in which a protrusion 24 is located.

    [0024] Here, the protrusion 24 is a portion for fixing the mold structure for the LED package 20 while the mold structure for the LED package 20 is pressed to a mold during fabrication of the mold structure for the LED package 20, and is generally formed of a metal. The protrusion 24 is a portion to be cut later by using a general mechanical processing method, e.g., a trimming operation. In a general trimming operation, the protrusion 24 is cut by arranging a die formed of a metal, for example, on the protrusion 24 and applying a pressure thereto. However, in the mold structure for the LED package 20, according to an embodiment of the present invention, the notch 22, which is a region for inserting a trimming die thereto, is formed at the bottom of the protrusion 24 to minimize the amount of remaining protrusion 24 after a trimming operation.

    [0025] FIG. 3 shows that a trimming die 25 is inserted to the rear of the mold structure for the LED package 20, according to an embodiment of the present invention, and a metal end is cut. Referring to FIG. 3, the trimming die 25 is inserted to the notch 22 at the bottom of the protrusion 24, and, after the trimming die 25 is fixed, cutting of an L-shaped portion is induced by applying a pressure to the protrusion 24 in the direction indicated by the arrow.

    [0026] Here, although the protrusion 24 is slightly exaggerated in FIG. 2A, the protruding length of the protrusion 24 after inserting the trimming die 25 to the notch 22 and cutting the protrusion 24 may be less than the width of the electrode lead 23. Generally, a trimming die used for a trimming operation has a width above 0.4 mm, and it is necessary to design a mold structure for a LED package to have a width of at least one surface greater than 0.4 mm due to the remaining protrusion. However, according to an embodiment of the present invention, a size of a mold structure for a LED package may be reduced as much as the size of a trimming die by forming the notch 22, to which the trimming die may be inserted, in the package mold 21. In detail, the protruding length of the protrusion 24 may be equal to or above 0 mm and below or equal to 0.4 mm. Furthermore, the amount of a material for forming the package mold 21 corresponding to volume of the notch 22 may be saved.

    [0027] The notch 22 may be formed at a region at the opposite side of the cavity 25 to which a LED of the package mold 21 is mounted, and, in an actual process for forming a mold structure for a LED package, the notch 22 may be formed in a region to correspond to a location at which a protrusion is to be formed.

    [0028] Referring back to FIGS. 2A and 2B, in the mold structure for the LED package 20, according to an embodiment of the present invention, the electrode lead 23 for supplying power to a LED package may be formed to have a bent structure that is very close to the package mold 21. Therefore, a size of a LED package may be minimized by eliminating the region A for bending the electrode lead 14, as shown in FIG. 1A.

    [0029] FIGS. 4A and 4B show a process for bending an electrode lead of a mold structure for a LED package, according to an embodiment of the present invention. Referring to FIGS. 4A and 4B, during fabrication of the package mold 21, the electrode lead 23 is formed to substantially protrude from two opposite sides of the package mold 21. To form the structure as shown in FIG. 4B, the package mold 21 is fixed, and the electrode lead 23 is bent downward. In other words, unlike in the related art, the electrode lead 23 is bent directly on the package mold 21 without using a separate bending die. The electrode lead 23 may be formed of a generally used copper material. Since the thickness of the electrode lead 23 is sufficiently small, the package mold 21 may withstand bending stress while the electrode lead 23 is being bent. Since a bending die generally used for bending the electrode lead 23 has a width above 0.4 mm, the width of a package mold is increased as much as the width of the bending die. However, in the case of the mold structure for the LED package 20, according to an embodiment of the present invention, a gap between the electrode lead 23 and the package mold 21 may be formed to be from 0mm to 0.4 mm, and thus, the overall size of the LED package 20 may be reduced.

    [0030] FIG. 5 is a diagram showing that a LED 201 is mounted to a mold structure for a LED package according to an embodiment of the present invention. Referring to FIG. 5, the LED 201 is mounted in a cavity 25 of the package mold 21, and power is supplied to the LED 201 from outside of the LED package via a bonding wire 202.

    [0031] Protrusions 24 remain at two opposite sides of the package mold 21, and, although not shown in FIG. 5, the notches 22 are formed at the bottom of the protrusions 24, as shown in FIGS. 2A and 2B. Furthermore, the electrode lead 23 is formed to contact at least a side of the package mold 21.

    [0032] A mold structure for a LED package, according to an embodiment of the present invention, may be a mold structure for a surface mount device (SMD) type LED package. In a SMD type LED package, the dimensions of a LED package, such as width, thickness, etc., significantly affect the performance of a display device employing the SMD type LED package. Therefore, the overall performance of a display device employing a SMD type LED package may be improved by forming the notch 22 in the package mold 21 and forming the electrode lead 23 to be closely attached to the package mold 21.

    [0033] In the above embodiments, a portion of a metal member protruding from a mold structure for a LED package may be minimized by forming a notch on the rear surface of the mold structure for a LED package for arranging a trimming die therein, and thus, a size of a LED package may be minimized.

    [0034] Furthermore, the size of a LED package may be minimized by forming electrode leads to be closely attached to a mold structure for a LED package.

    [0035] It should be understood that the exemplary embodiments described therein should be considered in a descriptive sense only and not for purposes of limitation. Descriptions of features or aspects within each embodiment should typically be considered as available for other similar features or aspects in other embodiments.


    Claims

    1. A mold structure for a light-emitting diode, LED, package (20), the mold structure comprising:

    a package mold (21), in which a cavity is formed to mount a LED therein; and

    characterized by

    a notch (22), which is formed at at least an end portion of the package mold (21) at the opposite side of the cavity to which the LED of the package mold (21) is mounted; and

    a protrusion (24) formed at a location corresponding to the notch (22), wherein the protrusion (24) is formed of a metal;

    wherein the notch (22) is formed at the bottom of the protrusion (24) and represents a region to which a trimming die can be inserted to reduce the length of the protrusion (24) remaining after a trimming operation using the trimming die.


     
    2. The mold structure of claim 1, further comprising an electrode lead (23), which is formed at at least an end portion of the package mold (21) and is closely attached to the package mold.
     
    3. The mold structure of claim 2, wherein a gap between the package mold and a portion of the electrode lead (23) is narrower than 0.4 mm.
     
    4. The mold structure of one of claims 1 to 3, wherein the mold structure for a LED package (20) is a mold structure for a surface mount device, SMD, type LED package (20).
     


    Ansprüche

    1. Formstruktur für ein Gehäuse (20) einer Leuchtdiode (Light Emitting Diode - LED), wobei die Formstruktur umfasst:

    eine Gehäuseform (21), in der ein Hohlraum ausgebildet ist, um eine LED darin zu montieren; und

    gekennzeichnet durch

    eine Kerbe (22), die an wenigstens einem Endteil der Gehäuseform (21) an der gegenüberliegenden Seite des Hohlraums ausgebildet ist, an dem die LED der Gehäuseform (21) montiert ist; und

    einen Vorsprung (24), der an einer Stelle entsprechend der Kerbe (22) ausgebildet ist, wobei der Vorsprung (24) aus einem Metall gebildet ist;

    wobei die Kerbe (22) am unteren Ende des Vorsprungs (24) ausgebildet ist und einen Bereich darstellt, in den eine Schneiddüse eingesetzt werden kann, um die Länge des Vorsprungs (24) zu reduzieren, die nach einem Schneidvorgang mittels der Schneiddüse verbleibt.


     
    2. Formstruktur nach Anspruch 1, die des Weiteren einen Elektrodenleiter (23) umfasst, der an wenigstens einem Endteil der Gehäuseform (21) ausgebildet und eng an der Gehäuseform angebracht ist.
     
    3. Formstruktur nach Anspruch 2, wobei ein Spalt zwischen der Gehäuseform und einem Teil des Elektrodenleiters (23) schmaler ist als 0,4 mm.
     
    4. Formstruktur nach einem der Ansprüche 1 bis 3, wobei die Formstruktur für ein Gehäuse (20) einer LED eine Formstruktur eines LED Gehäuses (20) für eine Art der Oberflächenmontagevorrichtung (Surface Mount Device - SMD) ist.
     


    Revendications

    1. Structure de moule pour un boîtier de diode électroluminescente, LED (20), la structure de moule comprenant:

    un moule de boîtier (21), dans lequel une cavité est formée pour y monter une DEL; et caractérisé par

    une encoche (22), qui est formée au moins à une partie d'extrémité du moule de boîtier (21) du côté opposé de la cavité sur laquelle la DEL du moule de boîtier (21) est montée; et

    une protubérance (24) formée à un emplacement correspondant à l'encoche (22), dans laquelle la protubérance (24) est formée d'un métal;

    dans laquelle l'encoche (22) est formée au fond de la protubérance (24) et représente une zone dans laquelle une matrice de coupe peut être insérée pour réduire la longueur de la protubérance (24) restante après une opération de coupe en utilisant la matrice de coupe.


     
    2. Structure de moule selon la revendication 1, comprenant en outre un conducteur d'électrode (23), qui est formé au niveau d'au moins une partie d'extrémité du moule de boîtier (21) et est étroitement lié au moule de boîtier.
     
    3. Structure de moule selon la revendication 2, dans laquelle un espace entre le moule de boîtier et une partie du conducteur d'électrode (23) est plus étroit que 0,4 mm.
     
    4. Structure de moule selon l'une des revendications 1 à 3, dans laquelle la structure de moule pour un boîtier LED (20) est une structure de moule pour un boîtier LED (20) de type CMS de montage en surface.
     




    Drawing





























    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description