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US20150091024A1 - Package structure of optical module - Google Patents

Package structure of optical module Download PDF

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Publication number
US20150091024A1
US20150091024A1 US14/563,408 US201414563408A US2015091024A1 US 20150091024 A1 US20150091024 A1 US 20150091024A1 US 201414563408 A US201414563408 A US 201414563408A US 2015091024 A1 US2015091024 A1 US 2015091024A1
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United States
Prior art keywords
light
admitting
emitting
chip
substrate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/563,408
Inventor
Ming-Te Tu
Yao-Ting YEH
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lingsen Precision Industries Ltd
Original Assignee
Lingsen Precision Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Lingsen Precision Industries Ltd filed Critical Lingsen Precision Industries Ltd
Priority to US14/563,408 priority Critical patent/US20150091024A1/en
Publication of US20150091024A1 publication Critical patent/US20150091024A1/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of semiconductor or other solid state devices
    • H01L25/16—Assemblies consisting of a plurality of semiconductor or other solid state devices the devices being of types provided for in two or more different subclasses of H10B, H10D, H10F, H10H, H10K or H10N, e.g. forming hybrid circuits
    • H01L25/167—Assemblies consisting of a plurality of semiconductor or other solid state devices the devices being of types provided for in two or more different subclasses of H10B, H10D, H10F, H10H, H10K or H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of semiconductor or other solid state devices
    • H01L25/16—Assemblies consisting of a plurality of semiconductor or other solid state devices the devices being of types provided for in two or more different subclasses of H10B, H10D, H10F, H10H, H10K or H10N, e.g. forming hybrid circuits
    • H01L25/165—Containers
    • H01L31/16—
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F55/00—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto
    • H10F55/20—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto wherein the electric light source controls the radiation-sensitive semiconductor devices, e.g. optocouplers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F55/00—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto
    • H10F55/20—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto wherein the electric light source controls the radiation-sensitive semiconductor devices, e.g. optocouplers
    • H10F55/25—Radiation-sensitive semiconductor devices covered by groups H10F10/00, H10F19/00 or H10F30/00 being structurally associated with electric light sources and electrically or optically coupled thereto wherein the electric light source controls the radiation-sensitive semiconductor devices, e.g. optocouplers wherein the radiation-sensitive devices and the electric light source are all semiconductor devices
    • H10W90/00—
    • H10W72/884—
    • H10W74/10—
    • H10W90/734—
    • H10W90/754—

Definitions

  • the present invention relates to package structures, and more particularly, to a package structure of an optical module.
  • an optical proximity sensing module is regarded as a mainstream technology choice for use with the new-generation smart electronic devices (such as smartphones). If the electronic device is brought close to the human ear (for face recognition) or put in a pocket, the optical proximity sensing module will turn off the screen display of the electronic device right away to save power and prevent an inadvertent touch on the screen display, thereby enhancing ease of use.
  • the optical proximity sensing module comprises a light-emitting chip (such as a light-emitting diode, LED) for emitting a light beam. The light beam reflects off an object surface to fall on a light-admitting chip and convert into an electronic signal for subsequent processing.
  • Taiwan patent M399313 discloses a proximity sensing package structure which comprises a base, a dam extending vertically and enclosing the base, and a lid disposed on the dam, so as to form a receiving space, wherein the receiving space has therein a partition board for dividing the receiving space, such that a light-emitting chip and a light-admitting chip can be separately disposed on a substrate to shun mutual light beam-related interference which might otherwise result in deterioration of product performance.
  • the present invention provides a method for packaging an optical module, the method comprising the steps of:
  • the encapsulants and the shielding layer are formed by molding.
  • the encapsulants are substantially inverted T-shaped.
  • the removal of the shielding layer is achieved by polishing, wherein the shielding layer is polished until the protruding top ends of the encapsulants are exposed, respectively.
  • the electrical connection step is achieved by a wire bonding process and a die attaching process.
  • the method further comprises step (e) in which the optical module packaged by the step (a) through step (d) is cut or punched.
  • the present invention further provides a package structure of an optical module, comprising a substrate, a light-emitting chip, a light-admitting chip, two encapsulants, and a shielding layer.
  • the substrate is defined with a light-emitting region and a light-admitting region.
  • the light-emitting chip is disposed at the light-emitting region of the substrate.
  • the light-admitting chip is disposed at the light-admitting region of the substrate.
  • the two encapsulants enclose the light-emitting chip and the light-admitting chip, respectively.
  • the shielding layer is formed on the substrate and the encapsulants and has a light-emitting hole and a light-admitting hole.
  • the light-emitting hole and the light-admitting hole are positioned above the light-emitting chip and the light-admitting chip, respectively.
  • the encapsulants and the shielding layer are made of a transparent opaque resin.
  • the substrate is a non-ceramic substrate made of an organic material, such as Bismaleimide Triazine.
  • an optical module package structure of the present invention is manufactured by removing a shielding layer above a light-emitting chip and a light-admitting chip and exposing top ends of encapsulants only, thereby simplifying the packaging process and cutting the manufacturing costs.
  • FIG. 1 is a top view of an optical module package structure according to a preferred embodiment of the present invention
  • FIG. 2 is a cross-sectional view of the optical module package structure taken along line 2 - 2 of FIG. 1 according to the preferred embodiment of the present invention.
  • FIG. 3 is a schematic view of the process flow of a packaging method according to the preferred embodiment of the present invention.
  • an optical module package structure 10 results from cutting a module from a typical package array and comprises a substrate 20 , a light-emitting chip 30 , a light-admitting chip 40 , two encapsulants 50 , and a shielding layer 60 .
  • the substrate 20 is a non-ceramic substrate made of an organic material, such as Bismaleimide Triazine, and thus the substrate 20 incurs a low material cost.
  • the substrate 20 is defined with a light-emitting region 22 and a light-admitting region 24 .
  • the light-emitting chip 30 and the light-admitting chip 40 undergo a die attaching process and a wire bonding process so as to be disposed at the light-emitting region 22 and the light-admitting region 24 of the substrate 20 , respectively.
  • the light-emitting chip 30 emits the light beam.
  • the light-admitting chip 40 receives the light beam emitted from the light-emitting chip 30 .
  • the encapsulants 50 are made of a transparent resin, such as a transparent epoxy resin.
  • the encapsulants 50 enclose the light-emitting chip 30 and the light-admitting chip 40 , respectively, by molding.
  • the shielding layer 60 is made of an opaque resin, such as an opaque epoxy resin.
  • the shielding layer 60 is formed on the substrate 20 and the encapsulants 50 and has a light-emitting hole 62 and a light-admitting hole 64 .
  • the light-emitting hole 62 and the light-admitting hole 64 are positioned above the light-emitting chip 30 and the light-admitting chip 40 , respectively.
  • the first step A involves defining the light-emitting region 22 and the light-admitting region 24 on the single substrate 20 of each substrate array and electrically connecting the light-emitting chip 30 and the light-admitting chip 40 to the light-emitting region 22 and the light-admitting region 24 of the substrate 20 by a die attaching process and a wire bonding process, respectively.
  • the second step B involves forming a transparent encapsulant 50 on the light-emitting chip 30 and the light-admitting chip 40 by molding, so as to form a protective layer.
  • the third step C involves forming an opaque shielding layer 60 on the encapsulants 50 and the substrate 20 by molding.
  • the fourth step D involves removing the shielding layer 60 above the light-emitting chip 30 and the light-admitting chip 40 .
  • the structure fabricated by the aforesaid steps undergoes a cutting process or a punching process to form a single module.
  • the second step B through the fourth step D comprise: aligning an inverted T-shaped die with the light-emitting chip 30 and the light-admitting chip 40 and positioning the inverted T-shaped die on the surface of the substrate 20 ; filling the inverted T-shaped die with a transparent resin such that the transparent resin covers the chips 30 , 40 ; removing the inverted T-shaped die as soon as the transparent resin sets so as to form the substantially inverted T-shaped encapsulants 50 ; positioning a hollow-cored die on the substrate 20 ; filling the die with an opaque resin to thereby cover the encapsulants 50 completely with the opaque resin such that the shielding layer 60 is formed as soon as the opaque resin sets; and polishing the shielding layer 60 from the top and horizontally to thin the shielding layer 60 gradually until the protruding top ends of the encapsulants 50 are exposed, respectively, so as to form the light-emitting hole 62 and the light-admitting hole 64 in the shielding layer 60 .
  • the optical module package structure 10 of the present invention is characterized by forming the shielding layer 60 above the light-emitting chip 30 and the light-admitting chip 40 by the first and second molding processes and then polishing the shielding layer 60 by a polishing process until the top ends of the encapsulants 50 are exposed, respectively, to form the light-emitting hole 62 and the light-admitting hole 64 in the shielding layer 60 , thereby simplifying the packaging process and cutting the manufacturing costs.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Led Device Packages (AREA)
  • Physics & Mathematics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Light Receiving Elements (AREA)
  • Structures Or Materials For Encapsulating Or Coating Semiconductor Devices Or Solid State Devices (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Abstract

A package structure of an optical module includes: a substrate defined with a light-emitting region and a light-admitting region; a light-emitting chip disposed at the light-emitting region of the substrate; a light-admitting chip disposed at the light-admitting region of the substrate; two encapsulants for enclosing the light-emitting chip and the light-admitting chip, respectively; and a shielding layer formed on the substrate and the encapsulants and having a light-emitting hole and a light-admitting hole, wherein the light-emitting hole and the light-admitting hole are positioned above the light-emitting chip and the light-admitting chip, respectively. Accordingly, the optical module package structure simplifies a packaging process and cuts manufacturing costs.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application is a Divisional of co-pending application Ser. No. 14/073,567, filed on Nov. 6, 2013, for which priority is claimed under 35 U.S.C. §120; and this application claims priority of Application No. 102126688 filed in Taiwan, R.O.C. on Jul. 25, 2013, under 35 U.S.C. §119, the entire contents of all of which are hereby incorporated by reference.
    • BACKGROUND OF THE INVENTION
  • 1. Technical Field
  • The present invention relates to package structures, and more particularly, to a package structure of an optical module.
  • 2. Description of Related Art
  • At present, an optical proximity sensing module is regarded as a mainstream technology choice for use with the new-generation smart electronic devices (such as smartphones). If the electronic device is brought close to the human ear (for face recognition) or put in a pocket, the optical proximity sensing module will turn off the screen display of the electronic device right away to save power and prevent an inadvertent touch on the screen display, thereby enhancing ease of use. The optical proximity sensing module comprises a light-emitting chip (such as a light-emitting diode, LED) for emitting a light beam. The light beam reflects off an object surface to fall on a light-admitting chip and convert into an electronic signal for subsequent processing. For instance, Taiwan patent M399313 discloses a proximity sensing package structure which comprises a base, a dam extending vertically and enclosing the base, and a lid disposed on the dam, so as to form a receiving space, wherein the receiving space has therein a partition board for dividing the receiving space, such that a light-emitting chip and a light-admitting chip can be separately disposed on a substrate to shun mutual light beam-related interference which might otherwise result in deterioration of product performance.
  • However, due to technological development, portable devices (such as smartphones, digital cameras, and other electronic products) are in increasingly wide use and have a trend toward reduction of weight and thickness, low costs, and high yield. However, the aforesaid patent is becoming less effective in coping with the aforesaid trend.
    • SUMMARY OF THE INVENTION
  • It is an objective of the present invention to provide a package structure of an optical module to simplify the packaging process and cut the manufacturing costs.
  • In order to achieve the above and other objectives, the present invention provides a method for packaging an optical module, the method comprising the steps of:
  • (a) defining a light-emitting region and a light-admitting region on a substrate;
  • (b) connecting electrically the light-emitting chip and light-admitting chip to the light-emitting region and the light-admitting region of the substrate, respectively;
  • (c) forming a transparent encapsulant on the light-emitting chip and the light-admitting chip;
  • (d) forming an opaque shielding layer on the encapsulants and the substrate; and
  • (e) removing the shielding layer above the light-emitting chip and the light-admitting chip.
  • The encapsulants and the shielding layer are formed by molding.
  • The encapsulants are substantially inverted T-shaped.
  • The removal of the shielding layer is achieved by polishing, wherein the shielding layer is polished until the protruding top ends of the encapsulants are exposed, respectively.
  • The electrical connection step is achieved by a wire bonding process and a die attaching process.
  • The method further comprises step (e) in which the optical module packaged by the step (a) through step (d) is cut or punched.
  • The present invention further provides a package structure of an optical module, comprising a substrate, a light-emitting chip, a light-admitting chip, two encapsulants, and a shielding layer.
  • The substrate is defined with a light-emitting region and a light-admitting region.
  • The light-emitting chip is disposed at the light-emitting region of the substrate.
  • The light-admitting chip is disposed at the light-admitting region of the substrate.
  • The two encapsulants enclose the light-emitting chip and the light-admitting chip, respectively.
  • The shielding layer is formed on the substrate and the encapsulants and has a light-emitting hole and a light-admitting hole. The light-emitting hole and the light-admitting hole are positioned above the light-emitting chip and the light-admitting chip, respectively.
  • The encapsulants and the shielding layer are made of a transparent opaque resin.
  • The substrate is a non-ceramic substrate made of an organic material, such as Bismaleimide Triazine.
  • Accordingly, an optical module package structure of the present invention is manufactured by removing a shielding layer above a light-emitting chip and a light-admitting chip and exposing top ends of encapsulants only, thereby simplifying the packaging process and cutting the manufacturing costs.
  • To enable persons skilled in the art to gain insight into the framework, features, and objectives of the present invention and implement the present invention accordingly, the present invention is hereunder illustrated with a preferred embodiment and the accompanying drawings and described in detail. However, the description below is merely intended to illustrate the technical solution and features of the present invention and the embodiment thereof. All simple modifications, replacements, or constituent component sparing made, without going against the spirit of the present invention, by persons skilled in the art after understanding the technical solution and features of the present invention should fall within the claims of the present invention.
    • BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
  • The technical contents and features of the present invention are hereunder illustrated with a preferred embodiment in conjunction with the accompanying drawings, in which:
  • FIG. 1 is a top view of an optical module package structure according to a preferred embodiment of the present invention;
  • FIG. 2 is a cross-sectional view of the optical module package structure taken along line 2-2 of FIG. 1 according to the preferred embodiment of the present invention; and
  • FIG. 3 is a schematic view of the process flow of a packaging method according to the preferred embodiment of the present invention.
    •  DETAILED DESCRIPTION OF THE EMBODIMENT OF THE INVENTION
  • Referring to FIG. 1 through FIG. 2, an optical module package structure 10 provided according to a preferred embodiment of the present invention results from cutting a module from a typical package array and comprises a substrate 20, a light-emitting chip 30, a light-admitting chip 40, two encapsulants 50, and a shielding layer 60.
  • The substrate 20 is a non-ceramic substrate made of an organic material, such as Bismaleimide Triazine, and thus the substrate 20 incurs a low material cost. The substrate 20 is defined with a light-emitting region 22 and a light-admitting region 24.
  • The light-emitting chip 30 and the light-admitting chip 40 undergo a die attaching process and a wire bonding process so as to be disposed at the light-emitting region 22 and the light-admitting region 24 of the substrate 20, respectively. The light-emitting chip 30 emits the light beam. The light-admitting chip 40 receives the light beam emitted from the light-emitting chip 30.
  • The encapsulants 50 are made of a transparent resin, such as a transparent epoxy resin. The encapsulants 50 enclose the light-emitting chip 30 and the light-admitting chip 40, respectively, by molding.
  • The shielding layer 60 is made of an opaque resin, such as an opaque epoxy resin. The shielding layer 60 is formed on the substrate 20 and the encapsulants 50 and has a light-emitting hole 62 and a light-admitting hole 64. The light-emitting hole 62 and the light-admitting hole 64 are positioned above the light-emitting chip 30 and the light-admitting chip 40, respectively.
  • Referring to FIG. 3, A through D, there is shown a schematic view of the process flow of a method for packaging an optical module according to the present invention. The first step A involves defining the light-emitting region 22 and the light-admitting region 24 on the single substrate 20 of each substrate array and electrically connecting the light-emitting chip 30 and the light-admitting chip 40 to the light-emitting region 22 and the light-admitting region 24 of the substrate 20 by a die attaching process and a wire bonding process, respectively. The second step B involves forming a transparent encapsulant 50 on the light-emitting chip 30 and the light-admitting chip 40 by molding, so as to form a protective layer. The third step C involves forming an opaque shielding layer 60 on the encapsulants 50 and the substrate 20 by molding. The fourth step D involves removing the shielding layer 60 above the light-emitting chip 30 and the light-admitting chip 40. Finally, the structure fabricated by the aforesaid steps undergoes a cutting process or a punching process to form a single module.
  • In the preferred embodiment of the present invention, the second step B through the fourth step D comprise: aligning an inverted T-shaped die with the light-emitting chip 30 and the light-admitting chip 40 and positioning the inverted T-shaped die on the surface of the substrate 20; filling the inverted T-shaped die with a transparent resin such that the transparent resin covers the chips 30, 40; removing the inverted T-shaped die as soon as the transparent resin sets so as to form the substantially inverted T-shaped encapsulants 50; positioning a hollow-cored die on the substrate 20; filling the die with an opaque resin to thereby cover the encapsulants 50 completely with the opaque resin such that the shielding layer 60 is formed as soon as the opaque resin sets; and polishing the shielding layer 60 from the top and horizontally to thin the shielding layer 60 gradually until the protruding top ends of the encapsulants 50 are exposed, respectively, so as to form the light-emitting hole 62 and the light-admitting hole 64 in the shielding layer 60.
  • In conclusion, the optical module package structure 10 of the present invention is characterized by forming the shielding layer 60 above the light-emitting chip 30 and the light-admitting chip 40 by the first and second molding processes and then polishing the shielding layer 60 by a polishing process until the top ends of the encapsulants 50 are exposed, respectively, to form the light-emitting hole 62 and the light-admitting hole 64 in the shielding layer 60, thereby simplifying the packaging process and cutting the manufacturing costs.
  • Constituent elements disclosed in the aforesaid embodiment of the present invention are illustrative rather than restrictive of the present invention. The replacements or changes of other equivalent elements should still fall within the appended claims of the present invention.

Claims (3)

What is claimed is:
1. A package structure of an optical module, comprising:
a substrate defined with a light-emitting region and a light-admitting region;
a light-emitting chip disposed at the light-emitting region of the substrate;
a light-admitting chip disposed at the light-admitting region of the substrate;
two encapsulants for enclosing the light-emitting chip and the light-admitting chip, respectively; and
a shielding layer formed on the substrate and the encapsulants and having a light-emitting hole and a light-admitting hole, wherein the light-emitting hole and the light-admitting hole are positioned above the light-emitting chip and the light-admitting chip, respectively.
2. The package structure of claim 1, wherein the encapsulants and the shielding layer are made of a transparent opaque resin.
3. The package structure of claim 1, wherein the substrate is a non-ceramic substrate made of an organic material, such as Bismaleimide Triazine.
US14/563,408 2013-07-25 2014-12-08 Package structure of optical module Abandoned US20150091024A1 (en)

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TW102126688A TWI527166B (en) 2013-07-25 2013-07-25 The package structure of the optical module
TW102126688 2013-07-25
US14/073,567 US9190398B2 (en) 2013-07-25 2013-11-06 Method for packaging an optical module
US14/563,408 US20150091024A1 (en) 2013-07-25 2014-12-08 Package structure of optical module

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