Patent Publication Number: US-2019181309-A1

Title: Cutting method of semiconductor package module and semiconductor package unit

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     This application claims the priority benefit of China application serial no. 201711297556.1, filed on Dec. 8, 2017. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of specification. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The invention relates to a cutting method of a semiconductor package module and a semiconductor package unit, and mainly adopt laser to cut the semiconductor package module. Power of the laser or the time during which the laser is projected to a substrate or a packaging layer is adjusted during a cutting process to increase the number of the semiconductor package units per unit area, facilitate a yield of the manufacturing process, and reduce a manufacturing cost of the semiconductor package unit. 
     2. Description of Related Art 
     Light emitting diodes (LEDs) are known for having a longer lifetime, a smaller size, a lower power consumption, a quick response time, no radiation, and monochromatic light emission, and are thus broadly applied in various products such as indicators, billboards, traffic signal lamps, vehicle lamps, display panels, communication devices, and consumers&#39; electronic products. 
     Referring to  FIGS. 1 and 2 ,  FIGS. 1 and 2  are respectively a side view and a top view illustrating a light emitting diode in the known art. A light emitting diode module  10  includes a substrate  11 , a plurality of light emitting diode dies  13  and at least one packaging layer  15 . The light emitting diode dies  13  are disposed on the substrate  11 , and the packaging layer  15  covers each of the light emitting diode dies  13  on the substrate  11  to form a package  151  and a protection layer  153  on each of the light emitting diode dies  13 . Specifically, the package  151  may be in a semi-spherical, planar, or curved structure. In addition to protecting the light emitting diode die  13 , the package  151  may also be configured to converge light generated by the light emitting diode die  13 . 
     After the light emitting diodes  13  and the packaging layer  15  are formed, a blade  12  may be adapted to cut the packaging layer  15  and the substrate  11  between two adjacent light emitting diode dies  13 . For example, the light emitting diode module  10  may be cut along cutting lines  14  in  FIGS. 1 and 2  to thereby form a plurality of light emitting diodes  101 . 
     For the convenience of cutting the light emitting diode module  10  with the blade  12 , when the light emitting diode dies  13  are disposed on the substrate  11 , a cutting channel  17  is preserved between the adjacent light emitting diode dies  13  in addition to a working width of the protection layer  153 , so as to prevent the blade  12  from damaging the package  151  or the light emitting diode die  13  during a cutting process. Due to the presence of the cutting channels  17 , the number of the packages  151  available on the substrate  11  is reduced, and the manufacturing cost of the package  151  is consequently higher. 
     Besides, there may be particles after the light emitting diode module  10  is cut by the blade  12 . Therefore, the cut light emitting diodes  101  may need to be washed with water or a cleaning solution. However, during the process of cleaning the light emitting diodes  101 , the packaging layer  15  or the remaining protection layer  153  on the substrate  11  may be detached, and the yield of the light emitting diodes  101  is thus reduced. 
     SUMMARY OF THE INVENTION 
     The embodiments of the invention provides a cutting method of a semiconductor package module and a semiconductor package unit using the same. According to the embodiments of the invention, laser is adopted to cut the semiconductor package module. Compared with cutting a substrate or a packaging layer with a blade, the embodiments of the invention are able to reduce the area of cutting channels preserved on a substrate to facilitate the number of the semiconductor package units per unit area and reduce a manufacturing cost of the semiconductor package unit. 
     A cutting method of a semiconductor package module according to the embodiments of the invention adopts laser to cut a semiconductor package module. When a semiconductor package is cut with laser, the power of the laser or the time during which the laser is projected to a substrate or a packaging layer may be adjusted to reduce the chance that a packaging layer is burned by the laser during a cutting process, which affects the yield and the reliability of the semiconductor package unit. 
     An embodiment of the invention provides a cutting method of a semiconductor package module. The cutting method includes steps as follow. A plurality of semiconductor chips are disposed on a surface of a substrate. The semiconductor chips disposed on the surface of the substrate are covered with a packaging layer. Laser is projected to the substrate or the packaging layer between two adjacent semiconductor chips, and a plurality of spot-like depressions are formed on the substrate or the packaging layer. In addition, a force is applied to the substrate to break the substrate along the spot-like depressions and form a plurality of semiconductor package units. 
     Another embodiment of the invention provides another cutting method of a semiconductor package module. The cutting method includes steps as follow. A plurality of semiconductor chips are disposed on a surface of a substrate. The semiconductor chips on the surface of the substrate are covered with a packaging layer. A plurality of cutting lines are defined on the surface of the substrate based on positions of the semiconductor chips, wherein each of the cutting lines is located between two semiconductor chips and includes a plurality of cutting sections. Laser is sequentially projected on the substrate or the packaging layer in non-adjacent cutting sections, and a plurality of cutting marks are sequentially formed on the substrate or the packaging layer in the non-adjacent cutting sections until the cutting marks are formed on all the cutting lines by the laser. In addition, a force is applied to the substrate to break the substrate along the cutting marks and form a plurality of semiconductor package units. 
     Another embodiment of the invention provides another cutting method of a semiconductor package module. The cutting method includes steps as follow. A packaging layer is disposed to cover at least one semiconductor chip. Laser is projected to the packaging layer between two adjacent semiconductor chips, and a plurality of spot-like depressions are formed on the packaging layer. In addition, a force is applied to the packaging layer to break the packaging layer along the spot-like depressions and form a plurality of semiconductor package units. 
     An embodiment of the invention provides a semiconductor package unit. The semiconductor package unit includes: a substrate including a front side surface, a back side surface, and a plurality of side surfaces, the front side surface and the back side surface are opposite to each other, and the side surfaces surround the front side surface and the back side surface; at least one semiconductor chip located on the front side surface of the substrate; a packaging layer disposed on the front side surface of the substrate and covering the semiconductor chip and having a plurality of sides; and a sawtoothed structure or a conical structure including a plurality of spot-like depressions and located at at least one of the side surfaces of the substrate and at least one of the sides of the packaging layer. 
     An embodiment of the invention provides a semiconductor package unit. The semiconductor package unit includes: at least one semiconductor chip; a packaging layer disposed to cover the semiconductor chip and having a plurality of sides; and a sawtoothed structure or a conical structure including a plurality of spot-like depressions and located at at least one of the sides of the packaging layer. 
     According to an embodiment of the invention, the laser is projected to the same position of the substrate or the packaging layer for one or more times, and the spot-like depressions are formed on the substrate or the packaging layer. 
     An embodiment of the invention further includes steps as follow. A plurality of cutting lines are defined on the surface of the substrate based on positions of the semiconductor chips, and the spot-like depressions are formed on the substrate or the packaging layer along the cutting lines by using the laser. 
     According to an embodiment of the invention, the packaging layer includes at least one package and at least one protection layer. The package is in a shape of a semi-sphere, a rectangular body, a polygon, or a planar or curved structure, and the package covers the semiconductor chip, and the protection layer is located at the surface of the substrate where the package is not disposed. 
     According to an embodiment of the invention, the cutting marks include a plurality of spot-like depressions. 
     According to an embodiment of the invention, the spot-like depression located at the at least one of the sides of the packaging layer includes a first arc-shaped structure, the spot-like depression located at the at least one of the side surfaces of the substrate includes a second arc-shaped structure, and a radian of the first arc-shaped structure is different from a radian of the second arc-shaped structure. 
     In order to make the aforementioned and other features and advantages of the invention comprehensible, several exemplary embodiments accompanied with figures are described in detail below. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention. 
         FIG. 1  is a side view illustrating a semiconductor package module according to the known art. 
         FIG. 2  is a top view illustrating a semiconductor package module according to the known art. 
         FIG. 3  is a top view illustrating a semiconductor package module according to an embodiment of the invention. 
         FIG. 4  is a side view illustrating a semiconductor package module according to an embodiment of the invention. 
         FIG. 5  is an enlarged top view illustrating a semiconductor package module according to an embodiment of the invention. 
         FIG. 6  is an enlarged side view illustrating a semiconductor package module according to an embodiment of the invention. 
         FIG. 7  is an enlarged side view illustrating a semiconductor package module according to an embodiment of the invention. 
         FIG. 8  is an enlarged side view illustrating a semiconductor package module according to an embodiment of the invention. 
         FIG. 9  is a top view illustrating a semiconductor package module according to another embodiment of the invention. 
         FIG. 10  is a top view illustrating a semiconductor package module according to another embodiment of the invention. 
         FIG. 11  is a top view illustrating a semiconductor package module according to another embodiment of the invention. 
         FIG. 12  is a schematic perspective view illustrating a semiconductor package unit according to an embodiment of the invention. 
         FIG. 13  is a top view illustrating a semiconductor package unit according to an embodiment of the invention. 
         FIG. 14  is a cross-sectional view illustrating a structure of a portion of a semiconductor package unit according to an embodiment of the invention. 
     
    
    
     DESCRIPTION OF THE EMBODIMENTS 
     Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. 
     Referring to  FIGS. 3 and 4 ,  FIGS. 3 and 4  are respectively a top view and a side view illustrating a semiconductor package module according to an embodiment of the invention. As shown in  FIGS. 3 and 4 , a semiconductor package module  20  according to an embodiment of the invention includes a substrate  21 , a plurality of semiconductor chips  23 , and a packaging layer  25 , wherein each of the semiconductor chips  23  is disposed on a surface of the substrate  21 , and a packaging layer  25  covers each of the semiconductor chips  23  and/or a surface of the substrate  21 . 
     According to an embodiment of the invention, the respective semiconductor chips  23  may be disposed as a matrix on the surface of the substrate  21 . For the ease of description, the semiconductor chips  23  in the drawing of the embodiment of the invention are shown in the matrix arrangement. However, the matrix arrangement is merely an embodiment of the invention and shall not be construed as a limitation on the scope of the invention. 
     In an embodiment of the invention, the semiconductor chip  23  may be an IC chip, a semiconductor device, or a light emitting diode die. In an embodiment of the invention, the substrate  21  may be a Si substrate, an Al 2 O 3  substrate, an AlN substrate, a sapphire substrate, an SiC substrate, a printed circuit board (PCB), a ceramic substrate, or a temporary substrate. In an embodiment of the invention, the packaging layer  25  may be formed by silicone, epoxy resin, acrylic resin, photoresist, a transparent or non-transparent encapsulant. In an embodiment of the invention, a fluorescent material, a photoresist material, a protective material, or a heat dissipating material may be added to the packaging layer  25 . 
     In an example where the semiconductor chip  23  is a light emitting diode die  231 , the light emitting diode die  231  includes a stack of a P-type material and an N-type material, where a PN junction is formed between the P-type material and the N-type material. In an embodiment of the invention, the N-type material may be formed on the substrate  21 , and the P-type material is formed on the N-type material, then, the N-type material and the P-type material are arranged by performing semiconductor manufacturing processes such as an exposure process, a development process, an etching process, and/or the like, so as to form the light emitting diode dies  231  on the substrate. The above-mentioned manufacturing process of the light emitting diode dies  231  is a common technology in the field of the invention and thus will not be further described in the following. Besides, people having ordinary skills in the art may also manufacture the light emitting diode dies  231  based on different processes and methods. In another embodiment of the invention, the light emitting diode dies  231  may also be disposed on the surface of the substrate  21  in a flip-chip manner. 
     In an embodiment of the invention, an electric circuit (not shown) may be disposed on the substrate  21 , and the light emitting diode dies  231  are electrically connected to the electric circuit of the substrate  21 . The power or control signal may be supplied to the light emitting diode dies  231  through the electric circuit, so that the light emitting diode dies  231  may emit light. The electric circuit may be disposed on the surface of the substrate  21  or penetrate through the substrate  21 . For example, the electric circuit may be formed by forming a plurality of through holes on the substrate  21  and arranging conductive metals in the through holes. The arrangement of the power circuit is also a common technology in the field of the invention, and various arrangements are possible. Therefore, details in this regard will not be further described in the following. 
     After the light emitting diode dies  231  are formed and connected to the power circuit, the packaging layer  25  may be disposed on the light emitting diode dies  231  and/or the surface of the substrate  21 . The packaging layer  25  may include a package  251  and a protection layer  253 . As shown in  FIG. 4 , the package  251  is disposed on each of the light emitting diode dies  231 . The package  251  may serve to protect the light emitting diode die  231  and the electric circuit. The package  251  may be in a semi-spherical shape as shown in the figure and converge light generated by the light emitting diode die  231  to generate a light shape as desired. In different embodiments, the package  251  may be embodied as a rectangular body, a planar structure, a curved structure, or a polygon body. In a process of covering the light emitting diode dies  231  with the packaging layer  25 , a portion of the packaging layer  25  may flow to the surface of the substrate  21  and form the protection layer  253  on the surface of the substrate  21 . 
     In the drawings and the above description according to the embodiments of the invention, one package  251  is mainly configured to cover one light emitting diode die  231 . However, in actual practice, one package  251  may also cover multiple light emitting diode dies  231 . For example, the package  251  may be configured to cover multiple light emitting diode dies  231  disposed on the surface of the substrate  21  or cover multiple light emitting diode dies  231  stacked with respect to each other. 
     After the semiconductor chips  23  and the packaging layer  25  are formed, the semiconductor package module  20  is subjected to a cutting process. The embodiments of the invention mainly adopt a laser  22  to cut the semiconductor package module  20  and thereby form a plurality of individual semiconductor package units  201 . 
     According to the descriptions in “Description of Related Art”, when the light emitting diode dies  13  and the packages  151  are disposed on the surface of the substrate  11 , it is common to preserve the cutting channels  17  between the adjacent packages  151  to prevent the packages  151  and/or the light emitting diode dies  13  from being damaged during the cutting process, as shown in  FIGS. 1 and 2 . However, with the cutting channels  17  disposed, the number of the light emitting diode dies  13  able to be disposed in the same working area on the substrate  11  may be reduced, and the manufacturing efficiency of the light emitting diodes  101  is thus affected. 
     In the embodiments of the invention, the semiconductor package  20  is cut with the laser  22 . Therefore, an area taken up by cutting channels  27  is reduced, or even the area taken up by the cutting channels  27  may be omitted. For example, the width of the cutting channel  27  shown in  FIGS. 3 and 4  is clearly shorter than the width of the cutting channel  17  in  FIGS. 1 and 2 . Therefore, in the same area of the surfaces of the substrates  11  or  21 , a greater number of the light emitting diode dies  231  may be disposed, and the manufacturing cost of the light emitting diode dies  231  is relatively reduced. Besides, since the area of the cutting channel  27  is reduced in the embodiments of the invention, the spherical area of the package  251  may be increased accordingly. Therefore, the light emitting efficiency of the semiconductor package units  201  may be facilitated. 
     However, when the substrate  21  or the packaging layer  25  is cut with the laser  22 , a high temperature generated by the laser  22  may burn the substrate  21  or the packaging layer  25 . For example, the protection layers  253  and/or the packages  251  may possibly absorb the energy of the laser  22  and be burned, and the yield of the semiconductor package units  201  may be affected. According to the embodiments of the invention, the laser  22  may be projected to the substrate  21  and/or the protection layer  253  of the packaging layer  25  between the adjacent semiconductor chips  23 , and a plurality of spot-like depressions  29  are formed on the substrate  21  and/or the packaging layer  25 , so as to reduce the chance that the packaging layer  25  is burned and the burned area. 
     When the semiconductor package module  20  is cut with the laser  22 , a plurality of cutting lines  24  may be defined on the surface of the substrate  21  based on positions of the semiconductor chips  23 . The cutting lines  24  are virtual lines located between the semiconductor chips  23 , and the laser  22  is projected on and move along the cutting lines  24 , so as to form the spot-like depressions  29  on the substrate  21  and/or the packaging layer  25 . For example, the semiconductor chips  23  on the substrate  21  may be arranged in a matrix, and the cutting lines  24  may be arranged to be chessboard-like. When the laser  22  moves along the cutting lines  24 , the laser  22  may be turned on and off based on a predetermined cycle or frequency, or the energy of the laser  22  may be increased and decreased based on a predetermined cycle or frequency. Accordingly, multiple discontinuous spot-like depressions  29  are formed along the cutting lines  24  on the surface of the substrate  21 , as shown in  FIG. 5 . The region A in  FIG. 5  corresponds to the region A in  FIG. 3 . 
     Since the laser  22  is not continuously turned on or maintained in a high-energy state for a long period of time when cutting the substrate  21  and/or the packaging layer  25  of the semiconductor package module  20 , the chance that the protection layers  253  and/or the packages  251  of the packaging layer  25  are burned and the burned area are able to be reduced. Besides, the area of the cutting channels  27  may be further reduced, or the cutting channels  27  may even be omitted. Therefore, a greater number of the semiconductor chips  23  may be disposed in a unit area of the surface of the substrate  21 , and the number of the semiconductor package units  201  yielded will be increased. 
     In an embodiment of the invention, the packaging layer  25  may be uniformly disposed on the surface of the substrate  21  and cover the semiconductor chips  23 . Then, the spot-like depressions  29  are formed on the packaging layer  25  and the substrate  21  by using the laser  22 . Then, the semiconductor package module  20  and/or the substrate  21  may be broken along the spot-like depressions  29  to form the semiconductor package units  201 . The appearance of the packaging layer  25  of the semiconductor package unit  201  manufactured accordingly may be formed as a rectangular body. 
     According to an embodiment of the invention, the laser  22  may be spotted for one or more times on the same position of the substrate  21  and/or the packaging layer  25  along the cutting lines  24 , so as to form the spot-like depressions  29  on the substrate  21  and/or the packaging layer  25 . Specifically, a first spot-like depression  291  having a first depth H 1  may be formed on the substrate  21  and/or the packaging layer  25  by using the laser  22 , as shown in  FIG. 6 . After a period of time, the laser  22  is projected again to the first spot-like depression  291  on the substrate  21  and/or the packaging layer  25  to form a second spot-like depression  293  having a second depth H 2  on the substrate  21  and/or the packaging layer  25 . In addition, the second depth H 2  is greater than the first depth H 1 , as shown in  FIG. 7 . The step may be repetitively performed until the depth of the spot-like depression  29  on the substrate  21  and/or the packaging layer  25  reaches a predetermined depth H, as shown in  FIG. 8 . In the embodiment, the spot-like depression  29  is formed by projecting the laser  22  to the substrate  21  and/or the packaging layer  25  for three times. However, the number of times of projection according to the embodiments of the invention is not limited to three. In practical use, the spot-like depression  29  may be formed by projecting the laser for once, twice, three times, or more than three times. 
     Specifically, the laser  22  may have a single wavelength and a single energy intensity, and is spotted to the substrate  21  and/or the packaging layer  25  in separate sessions to form the spot-like depression  29 . Besides, the laser  22  may also have different wavelengths and different energy intensities, and may also be spotted on the substrate  21  and/or the packaging layer  25  in separate sessions to form the spot-like depression  29 . 
     Since the first spot-like depression  291 , the second spot-like depression  293 , and the spot-like depression  29  are formed on the substrate  21  and/or the packaging layer  25  by using the laser  22  in separate sessions, there are certain time intervals among time points when the first spot-like depression  291 , the second spot-like depression  293 , and the spot-like depression  29  are formed. Therefore, the laser  22  is projected to the same position after the substrate  21  and/or the packaging layer  25  is cooled off, and the chance that the protection layers  253  and/or the packages  251  of the packaging layer  25  is burned and the burned area may be further reduced and/or eliminated. 
     Specifically, the spot-like depressions  29  according to the embodiments of the invention do not penetrate through the substrate  21 . Therefore, after the spot-like depressions  29  are formed, the substrate  21  is not broken along the spot-like depressions  29  or the cutting lines  24 . After the spot-like depressions  29  are formed on all the cutting lines  24 , a force may be applied to the substrate  21  to break the substrate  21  of the semiconductor package module  20  along the cutting lines  24  and thereby form the semiconductor package units  201  that are cut. 
     In an embodiment of the invention, a cross-section of the spot-like depression  29  formed on the substrate  21  and/or the packaging layer  25  by using the laser  22  may be an arc-shaped structure, as shown in  FIGS. 6 to 8 . The region B in  FIGS. 6 to 8  corresponds to the region B in  FIG. 4 . The spot-like depression  29  having an arc-shaped structure is a main characteristic of the semiconductor package unit  201  manufactured based on the cutting method according to the embodiments of the invention. 
     In an embodiment of the invention, the spot-like depression  29  may be divided into a protection layer depression  29  broken at the protection layer  253 , a substrate depression  297  broken at the substrate  21 , and a laser spot depression  298  marking an end point of laser cutting. In addition, a working width at the top of the protection layer depression  296  is in a range from about 1 um to 500um, a working width at the top of the substrate depression  297  is in a range from about 1 um to 150 um, and a working width of the laser spot depression  298  is in a range from about 1 um to 100 um. The working area and the working width of 0.01 um to 100 um of the spot-like depression  29  according to the embodiments of the invention formed when a force is applied to the substrate  21  to break the substrate  21  of the semiconductor package module  20  along the cutting lines  24  are very small and may even be ignored. In the known semiconductor package module, each semiconductor package unit (e.g., the semiconductor package unit  101  or the semiconductor package unit  201 ) requires to preserve the position of a cutting channel (e.g., the cutting channel  17 ) in addition to a working width for a protection layer (e.g., the protection layer  153  or the protection layer  253 ). In the embodiments of the invention, the cutting channel (e.g., the cutting channel  17 ) does not need to be preserved or used, and the whole laser processing is performed within a vertical working area of the original protection layer (e.g., the protection layer  153  or the protection layer  253 ). Therefore, a greater number of semiconductor chips (e.g., the semiconductor chips  13  or the semiconductor chips  23 ) may be disposed in the same area of a substrate (e.g., the substrate  11  or the substrate  21 ), and a greater number of semiconductor package units (e.g., the semiconductor package units  101  or the semiconductor package units  201 ) may be yielded. 
     Referring to  FIG. 9 ,  FIG. 9  is a top view illustrating a semiconductor package module according to another embodiment of the invention. As shown in  FIG. 9 , a semiconductor package module  20  according to an embodiment of the invention includes a substrate  21 , a plurality of semiconductor chips  23 , and a packaging layer  25 , wherein each of the semiconductor chips  23  is disposed on a surface of the substrate  21 , and the packaging layer  25  covers each of the semiconductor chips  23  and/or the surface of the substrate  21 . 
     Based on the positions of the semiconductor chips  23  on the surface of the substrate, the cutting lines  24  may be defined on the surface of the substrate  21 . In addition, the cutting lines  24  are virtual lines. Each of the cutting lines  24  is located between two adjacent semiconductor chips  23 . In addition, each of the cutting lines  24  includes a plurality of cutting sections (e.g., a first cutting section  2411  and a second cutting section  2431 ). 
     In an embodiment of the invention, the cutting lines  24  defined on the surface of the substrate  21  may include a plurality of first cutting lines  241  parallel to a first direction X and a plurality of second cutting lines  243  parallel to a second direction Y. In addition, the respective first cutting lines  241  respectively interlace the respective second cutting lines  243 , and the semiconductor chips  23  are located at regions formed by two adjacent first cutting lines  241  and two adjacent second cutting lines  243 . The laser  22  may cut the semiconductor package module  20  and/or the substrate  21  along the virtual cutting lines  24 . In an embodiment of the invention, the first cutting lines  241  and the second cutting lines  243  may be perpendicular to each other and form a chessboard-like structure on the substrate  21 . In addition, the respective semiconductor chips  23  are located in regions in the chessboard. The first cutting lines  241  and the second cutting lines  243  being perpendicular to each other is only described herein as an example and shall not be construed as a limitation on the scope of the invention. 
     Each of the cutting lines  24  may include a plurality of cutting sections (e.g., the first cutting section  2411  or the second cutting section  2431 ). For example, the first cutting line  241  includes multiple first cutting sections  2411 , and the second cutting line  243  includes multiple second cutting sections  2431 . To reduce the chance that the packaging layer  25  is burned by the laser  22  and the burned area, the laser  22  in the embodiment of the invention is sequentially projected to the substrate  21  and/or the packaging layer  25  in non-adjacent cutting sections (e.g., the first cutting section  2411  and the second cutting section  2431 ), and sequentially forms a plurality of discontinuous cutting marks  39  on the substrate  21  and/or the packaging layer  25  in non-adjacent cutting sections (e.g., the first cutting section  2411  and the second cutting section  2431 ), until the cutting marks  39  are formed on all the cutting lines  24  by the laser  22 , as shown in  FIG. 10 . 
     In the drawing of the embodiment of the invention, the first cutting section  2411  is located on the first cutting line  241  and between two adjacent second cutting lines  243 , while the second cutting section  2431  is located on the second cutting line  243  and between two adjacent first cutting lines  241 . However, in practice, lengths of the first cutting section  2411  and the second cutting section  2431  are not limited to intervals between two adjacent first cutting lines  241  and two adjacent second cutting lines  243 , and may be greater or less than the intervals between the first cutting lines  241  and the second cutting lines  243 . 
     When the cutting marks  39  are formed on all the cutting lines  24 , a force may be applied to the substrate  21 . Accordingly, the substrate  21  of the semiconductor package module  20  may be broken along the cutting lines  24  to form the cut semiconductor package units  201 . 
     In another embodiment of the invention, one cutting mark  39  may be formed through formation of multiple spot-like depressions  29  based on the method shown in  FIGS. 3 to 8 , as shown in  FIG. 11 . The laser  22  may be sequentially projected to non-adjacent cutting sections (e.g., the first cutting section  2411  and the second cutting section  2431 ), and the multiple spot-like depressions  29  are sequentially formed in non-adjacent cutting sections (e.g., the first cutting section  2411  and the second cutting section  2431 ) to form the cutting marks  39  of the embodiment, until the multiple spot-like depressions  29  are formed on all the cutting lines  24  and the structure shown in  FIG. 3  is formed. How the spot-like depressions  29  are formed is as shown in  FIGS. 3 to 8 . 
     Referring to  FIGS. 12 and 13 ,  FIGS. 12 and 13  are respectively a schematic perspective view and a top view illustrating a semiconductor package unit according to an embodiment of the invention. As shown in  FIGS. 12 and 13 , the semiconductor package unit  201  includes the substrate  21 , at least one semiconductor chip  23 , and the packaging layer  25 , wherein the substrate  21  includes a front side surface  211 , a back side surface  213 , and a plurality of side surfaces  215 . The front side surface  211  is opposite to the back side surface  213 , and the plurality of side surfaces  215  are disposed at sides of the front side surface  211  and/or the back side surface  213 . 
     The semiconductor chip  23  is disposed on the front side surface  211  of the substrate  21 , and the packaging layer  25  covers the semiconductor chip  23  and the front side surface  211  of the substrate  21 . In an embodiment of the invention, the packaging layer  25  includes the package  251  and the protection layer  253 , wherein the package  251  is configured to cover the semiconductor chip  23 , and the protection layer  253  is disposed on a portion of the front side surface  211  of the substrate  21 . In addition, the packaging layer  25  disposed on the front side surface  211  of the substrate  21  includes a plurality of sides  255 . 
     In the semiconductor package unit  201  manufactured according to the cutting method according to the embodiment of the invention, a sawtoothed or conical structure is formed on at least one side surface  215  of the substrate  21  and at least one side  255  of the packaging layer  25 . For example,  FIG. 13  illustrates a sawtoothed structure. Specifically, when the semiconductor package module  20  is broken along the spot-like depressions  29  and/or the cutting lines  24 , a sawtoothed structure  290  is formed accordingly on at least one side of the semiconductor package unit  201 , and the sawtoothed structure  290  is formed by multiple spot-like depressions  29 . 
       FIG. 14  is a schematic cross-sectional view illustrating the spot-like depression  29  and/or the sawtoothed structure  290  of the semiconductor package unit  201 . The region C in  FIG. 14  is an enlarged cross-sectional schematic view corresponding to the region C in  FIG. 12 . At least one side  255  of the packaging layer  25  has a first arc-shaped structure  257 , and at least one side surface  215  of the substrate  21  has a second arc-shaped structure  217 , wherein the first arc-shaped structure  257  and the second arc-shaped structure  217  may have different radian or different radii of curvature. 
     In yet another embodiment of the invention, the light emitting diode dies  231  may also be disposed on a surface of a temporary substrate  21 . The laser  22  is projected on the package  251  between two adjacent semiconductor chips  23  and form the spot-like depressions on the package  251 . Then, the temporary substrate is removed, and then a force is applied to the package  251  to break the package  251  along the spot-like depressions  29 . Accordingly, the semiconductor package units  201  having only the semiconductor chips  23  and the packaging layer  25  and not having the substrate  21  are formed. 
     It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.