US20070221942A1 - LED backlight unit without printed circuit board and method of manufacturing the same - Google Patents

LED backlight unit without printed circuit board and method of manufacturing the same Download PDF

Info

Publication number
US20070221942A1
US20070221942A1 US11/723,235 US72323507A US2007221942A1 US 20070221942 A1 US20070221942 A1 US 20070221942A1 US 72323507 A US72323507 A US 72323507A US 2007221942 A1 US2007221942 A1 US 2007221942A1
Authority
US
United States
Prior art keywords
insulating resin
resin layer
chassis
circuit patterns
backlight unit
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
US11/723,235
Other languages
English (en)
Inventor
Gi Ho Jeong
Si Young Yang
Jae Wook Kwon
Jeong Hoon Park
Hyun Ju Yi
Choon Keun Lee
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.)
Samsung Electronics Co Ltd
Original Assignee
Samsung Electro Mechanics Co 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 Samsung Electro Mechanics Co Ltd filed Critical Samsung Electro Mechanics Co Ltd
Assigned to SAMSUNG ELECTRO-MECHANICS CO., LTD. reassignment SAMSUNG ELECTRO-MECHANICS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KWON, JAE WOOK, LEE, CHOON KEUN, YI, HYUN JU, JEONG, GI HO, YANG, SI YOUNG, PARK, JEONG HOON
Publication of US20070221942A1 publication Critical patent/US20070221942A1/en
Priority to US12/779,695 priority Critical patent/US8779561B2/en
Assigned to SAMSUNG LED CO., LTD. reassignment SAMSUNG LED CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAMSUNG ELECTRO-MECHANICS CO., LTD.
Abandoned legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/03—Use of materials for the substrate
    • H05K1/05—Insulated conductive substrates, e.g. insulated metal substrate
    • H05K1/056—Insulated conductive substrates, e.g. insulated metal substrate the metal substrate being covered by an organic insulating layer
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/02—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding
    • H05K3/04—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed mechanically, e.g. by punching
    • H05K3/045—Apparatus or processes for manufacturing printed circuits in which the conductive material is applied to the surface of the insulating support and is thereafter removed from such areas of the surface which are not intended for current conducting or shielding the conductive material being removed mechanically, e.g. by punching by making a conductive layer having a relief pattern, followed by abrading of the raised portions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/42—Wire connectors; Manufacturing methods related thereto
    • H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
    • H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
    • H01L2224/4805—Shape
    • H01L2224/4809—Loop shape
    • H01L2224/48091—Arched
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/01—Chemical elements
    • H01L2924/01019—Potassium [K]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/03—Conductive materials
    • H05K2201/0332—Structure of the conductor
    • H05K2201/0364—Conductor shape
    • H05K2201/0376—Flush conductors, i.e. flush with the surface of the printed circuit
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09009—Substrate related
    • H05K2201/09036—Recesses or grooves in insulating substrate
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/10—Details of components or other objects attached to or integrated in a printed circuit board
    • H05K2201/10007—Types of components
    • H05K2201/10106—Light emitting diode [LED]
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/01—Tools for processing; Objects used during processing
    • H05K2203/0104—Tools for processing; Objects used during processing for patterning or coating
    • H05K2203/0108—Male die used for patterning, punching or transferring
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2203/00—Indexing scheme relating to apparatus or processes for manufacturing printed circuits covered by H05K3/00
    • H05K2203/02—Details related to mechanical or acoustic processing, e.g. drilling, punching, cutting, using ultrasound
    • H05K2203/025—Abrading, e.g. grinding or sand blasting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/49155—Manufacturing circuit on or in base
    • Y10T29/49158—Manufacturing circuit on or in base with molding of insulated base
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49169—Assembling electrical component directly to terminal or elongated conductor
    • Y10T29/49171—Assembling electrical component directly to terminal or elongated conductor with encapsulating
    • Y10T29/49172—Assembling electrical component directly to terminal or elongated conductor with encapsulating by molding of insulating material

Definitions

  • the present invention relates generally to a backlight unit installed in a Liquid Crystal Display (LCD) device and, more particularly, to a Light Emitting Diode (LED) backlight unit without a Printed Circuit board (PCB), in which light source modules, that is, LED packages, are directly mounted on a chassis.
  • LCD Liquid Crystal Display
  • LED Light Emitting Diode
  • PCB Printed Circuit board
  • a backlight unit is a device that is installed in an LCD using the principle in which liquid crystals change their molecular arrangement according to applied voltage, and provides light and illuminates a screen from behind.
  • backlight units to which one or more cold-cathode tubes are applied were mainly used, backlight units to which LEDs are applied currently attracts attention due to their advantages with respect to life span, brightness, color reproducibility, etc.
  • LEDs Unlike cold-cathode tubes, LEDs require substrates when they are used as light sources. Since such LEDs emit large quantities of heat while radiating light, metal core substrates (metal core printed circuit boards), having an excellent heat dissipation characteristic, have been used.
  • metal core substrates have an excellent heat dissipation characteristic, they are very expensive. Accordingly, the high cost of the metal core substrates is one of the principal factors that decrease the cost competitiveness of the backlight units formed of the metal core substrates. As a result, there is a trend toward the use of relatively inexpensive epoxy resin insulating substrates.
  • An example of a conventional backlight unit in which LEDs are mounted on such an insulating substrate is illustrated in FIG. 4 .
  • a backlight unit 200 includes an insulating substrate 210 , a plurality of LED packages 230 , and a chassis 250 .
  • Circuit patterns 211 and 212 are formed on the insulating substrate 210 by coating an epoxy resin FR4-core with a copper foil and etching the copper foil.
  • Each of the LED packages 230 is mounted such that an LED chip 231 is directly connected to one LED electrode 232 and is wire-bonded to the other LED electrode 233 .
  • the LED chip 231 and the LED electrodes 232 and 233 are placed within a plastic mold casing 234 , and the casing 234 is covered with an epoxy resin lens 235 .
  • the LED package 230 is mounted on the insulating substrate 210 , and is electrically connected to positive and negative electrodes, that is, to the circuit patterns 211 and 212 .
  • the chassis 250 is made of material having excellent thermal conductivity, such as metal, and is placed beneath the insulating substrate 210 , and a heating pad 270 is placed therebetween so as to provide electrical insulation and decrease contact thermal resistance.
  • the thermal conductivity K substrate of the substrate 210 is 0.35 W/m° C.
  • the thickness t heating pad of the heating pad 270 is 0.2 mm
  • the thermal conductivity K heating pad of the heating pad is 1.00 W/m° C.
  • the area A of the substrate 210 or the heating pad 270 is 36 mm 2 ,
  • the total thermal resistance is very high.
  • the thickness of the heating pad 270 is 0.5 mm, a total thermal resistance of 77.88° C./W results.
  • the insulating substrate of the conventional backlight unit having the above-described construction exhibits very poor thermal conductivity, therefore it is difficult to effectively eliminate heat generated by the LED chips, with the result that the temperature of the LED chips still increases. Accordingly, the amount of light emitted by the LED chips decreases, variation in wavelength occurs, and the reliability of the LED chips decreases, thus resulting in a reduced lifespan.
  • the heating pad is made of a high polymer material having appearance characteristics similar to those of a thin rubber plate. This not only increases the price of the backlight unit and but also requires close attention to be paid to an assembly process.
  • an object of the present invention is to provide a backlight unit, in which light source modules, that is, LED packages, are directly mounted on a chassis without the use of a PCB, thus reducing the thermal resistance and thickness thereof and, at the same time, decreasing the price thereof.
  • the present invention provides a LED backlight unit without a PCB, including a chassis; an insulating resin layer formed on the chassis; circuit patterns formed on the insulating resin layer; and one or more light source modules mounted on the insulating resin layer and electrically connected to the circuit patterns.
  • the insulating resin layer has a thickness of 200 ⁇ m or less.
  • the insulating resin layer is formed by laminating solid film insulating resin on the chassis or by applying liquid insulating resin to the chassis using a molding method employing spin coating or blade coating.
  • the circuit patterns are formed by filling the engraved circuit patterns of the insulating resin layer with metal material.
  • the engraved circuit patterns are formed by pressing the insulation resin layer using a stamp having embossed circuit patterns.
  • the light source modules are LED packages.
  • the present invention provides a method of manufacturing an LED backlight unit without a PCB, including the steps of forming an insulating resin layer on a chassis; forming engraved circuit patterns by engraving circuit patterns on the insulating resin layer; filling the engraved circuit patterns with metal material or plating the engraved circuit patterns with metal material; forming circuit patterns by removing metal material that does not fill the engraved circuit patterns; and mounting one or more light source modules on the insulating resin layer and electrically connecting corresponding light source modules with the circuit patterns.
  • the insulating resin layer has a thickness of 200 ⁇ m or less at the step of forming the insulating resin layer on the chassis.
  • the step of forming the insulating resin layer on the chassis is performed by laminating insulating resin on the chassis in solid film form or applying insulating resin to the chassis in liquid form.
  • the insulating resin is applied to the chassis in liquid form using a molding method employing spin coating or blade coating.
  • the light source modules are LED packages.
  • FIG. 1 is a schematic sectional view of an LED backlight unit without a PCB according to a preferred embodiment of the present invention
  • FIG. 2 is a flowchart illustrating a method of manufacturing the backlight unit of FIG. 1 ;
  • FIGS. 3A to 3F are schematic sectional views illustrating the respective steps of the flowchart of FIG. 2 ;
  • FIG. 4 is a schematic sectional view of a conventional LED backlight unit.
  • the backlight unit 100 of the present embodiment includes a chassis 110 .
  • An insulating resin layer 130 is formed on the chassis 110 , and a plurality of LED packages 150 is mounted on the insulating resin layer 130 .
  • the chassis 110 is an element that is used as a casing for the backlight unit 100 , and is made of metal material, such as aluminum or copper, which has very excellent thermal conductivity. In particular, it is preferred that the chassis be made of aluminum material so as to reduce the weight thereof.
  • the insulating resin layer 130 is made of a high polymer material having appearance characteristics similar to a thin rubber plate, that is, a material similar or identical to a conventional heating pad.
  • solid film-type insulating resin, having adhesiveness, or liquid insulating resin may be applied to the top surface of the chassis 110 .
  • the solid film-type insulating resin is applied to the chassis 110 using a lamination method
  • the liquid insulating resin is applied to the chassis 110 using a molding method employing spin coating or blade coating.
  • metal material such as copper
  • the circuit pattern 140 is formed by filling engraved patterns with metal material.
  • the present invention directly forms the circuit pattern 140 on the chassis 110 as described above, thus reducing the total thickness of the backlight unit and, at the same time, greatly reducing the thermal resistance.
  • the LED packages 150 include a plurality of sets of LED packages for emitting red light, green right, and blue light.
  • the plurality of sets of LED packages are mounted on the chassis 110 in accordance with a design. Since the LED packages have the same elements but emits respective light beams having different colors, only a single LED package 150 is shown in FIG. 1 , for ease of description, and the description is made based on this.
  • Each of the LED packages 150 includes an LED chip 151 , LED electrodes 152 and 153 , a plastic molding casing 154 , and a lens 155 .
  • the LED chip 151 is a means for emitting red, green or blue light, is directly mounted on one LED electrode 152 , and is electrically connected with another LED electrode 153 through wire bonding.
  • the LED electrode 152 is mounted on the positive one of the circuit patterns 141 and 142 formed on the chassis 110
  • the LED electrode 153 is mounted on the negative one of the circuit patterns 141 and 142 .
  • the LED chip 151 and the LED electrodes 152 and 153 are protected from the environment by the plastic molding casing 154 , and the casing 154 is covered with the epoxy resin transparent lens 155 .
  • the backlight unit 100 of FIG. 1 is manufactured through the steps of the flowchart of FIG. 2 , and the respective steps are schematically illustrated in FIGS. 3A to 3F to promote an understanding of the present invention.
  • the insulating resin layer 130 is formed on the chassis 110 to have a thickness of about 10 ⁇ m, as shown in FIG. 3A .
  • the insulating resin layer 130 is made of a high polymer material having appearance characteristics similar to a thin rubber plate, that is, a material similar or identical to a conventional heating pad.
  • solid film-type insulating resin, having adhesiveness, or liquid insulating resin may be applied to the top surface of the insulating resin layer 130 .
  • the solid film-type insulating resin is applied to the chassis 110 using a lamination method, and the liquid insulating resin is applied to the chassis 110 using a molding method employing spin coating or blade coating. Furthermore, when the liquid insulating resin layer 130 is formed, the process proceeds to the next step after the liquid insulating resin layer 130 is placed in semi-cured status due to the evaporation of the solvent thereof.
  • engraved circuit patterns 131 and 132 are formed by engraving circuit patterns on the insulating resin layer 130 (which is placed in semi-cured status) using a stamp 120 , as shown in FIGS. 3B and 3C .
  • Embossed circuit patterns are formed on the lower surface of the stamp 120 .
  • the engraved circuit patterns are 131 and 132 are formed by pressing the stamp 120 onto the insulating resin layer 130 using a predetermined force.
  • the insulating resin layer 130 in which the engraved circuit patterns 131 and 132 are formed, is filled with metal material, such as copper, or is plated with the metal material, as shown in FIG. 3D .
  • circuit patterns 141 and 142 are formed by removing metal material, such as copper, that does not fill the engraved patterns 131 and 132 or has not been used to plate the engraved patterns 131 and 132 , as shown in FIG. 3E .
  • metal material such as copper
  • a process of flattening a coating layer or a plating layer to remove the metal material may be performed using a physical or chemical method.
  • the light source modules that is, the LED package 150 , are mounted on the chassis 110 and are electrically connected with the circuit patterns 141 and 142 , as shown in FIG. 3F .
  • the light source modules are mounted on the insulating resin layer 130 disposed on the chassis 110 .
  • the backlight unit 100 of the present embodiment does not require any separate PCB or heating pad, thus greatly reducing the thickness thereof. That is, the conventional PCB, having a thickness of about 0.8 mm, and the conventional heating pad, having a thickness of about 0.2 mm can be replaced with the insulating resin 130 having a thickness of 10 ⁇ m, therefore a reduction to about 1/100 of an original thickness can be achieved.
  • the backlight unit 100 is formed using the insulating resin 130 having a thickness of 10 ⁇ m, the thickness may be varied within the range of 1 ⁇ m ⁇ 200 ⁇ m in various ways according to the design of the circuit patterns.
  • the thermal resistance values of the backlight unit 100 depending on variation in the thickness of the insulating resin layer 130 , as determined through experimentation, are listed in the following Table 1.
  • Thickness of insulating Thermal resistance resin ( ⁇ m) (° C./W) 1 0.08 2 0.16 3 0.24 4 0.32 5 0.40 6 0.48 7 0.56 8 0.63 9 0.71 10 0.79 20 1.59 30 2.38 40 3.17 50 3.97 60 4.76 70 5.56 80 6.35 90 7.14 100 7.94 200 15.87
  • the thickness of the insulating resin layer 130 that can be applied to the present invention does not exceed 0.2 mm (200 ⁇ m), which is the thickness of a conventional heating pad.
  • 0.2 mm 200 ⁇ m
  • a reduction in the thickness of the conventional PCB having a thickness of 0.8 mm can be achieved even though the insulating resin layer is formed to have the maximum thickness. That is, the total thickness can be reduced to at least 1 ⁇ 5.
  • the thermal resistance thereof is 0.79° C./W
  • the thermal resistance of the present embodiment can be greatly reduced, to about 1/87.8 of the original thickness for a comparable conventional thermal resistance of 69.4° C./W, which is achieved by using a PCB having a thickness of 0.8 mm and a heating pad having a thickness of 0.2 mm.
  • the thermal resistance can be reduced to about 1/8.7 of the original thickness.
  • the thermal resistance can be reduced to about 1/4.4 of the original thickness.
  • circuit patterns are formed in the insulating resin layer formed on the chassis, so that no PCB and heating pad are required, therefore the total thickness can be greatly reduced and, at the same time, the total thermal resistance can be reduced.
  • the thermal resistance is greatly reduced, so that heat generated by the LED chips can be smoothly removed, therefore an increase in the temperature of LED chips is prevented and, thus, a reduction in the amount of light and variation in wavelength of the LED chips is removed. As a result, reliability can be increased and the lifespan of the LED chips can be increased.

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Nonlinear Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Led Device Packages (AREA)
  • Liquid Crystal (AREA)
  • Fastening Of Light Sources Or Lamp Holders (AREA)
US11/723,235 2006-03-21 2007-03-19 LED backlight unit without printed circuit board and method of manufacturing the same Abandoned US20070221942A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/779,695 US8779561B2 (en) 2006-03-21 2010-05-13 LED backlight unit without printed circuit board and method of manufacturing the same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2006-0025803 2006-03-21
KR1020060025803A KR100797716B1 (ko) 2006-03-21 2006-03-21 회로기판이 없는 ｌｅｄ-백라이트유닛 및 그 제조방법

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/779,695 Division US8779561B2 (en) 2006-03-21 2010-05-13 LED backlight unit without printed circuit board and method of manufacturing the same

Publications (1)

Publication Number Publication Date
US20070221942A1 true US20070221942A1 (en) 2007-09-27

Family

ID=38134073

Family Applications (2)

Application Number Title Priority Date Filing Date
US11/723,235 Abandoned US20070221942A1 (en) 2006-03-21 2007-03-19 LED backlight unit without printed circuit board and method of manufacturing the same
US12/779,695 Active 2028-06-16 US8779561B2 (en) 2006-03-21 2010-05-13 LED backlight unit without printed circuit board and method of manufacturing the same

Family Applications After (1)

Application Number Title Priority Date Filing Date
US12/779,695 Active 2028-06-16 US8779561B2 (en) 2006-03-21 2010-05-13 LED backlight unit without printed circuit board and method of manufacturing the same

Country Status (5)

Country Link
US (2) US20070221942A1 (ja)
EP (1) EP1837923B1 (ja)
JP (1) JP5165913B2 (ja)
KR (1) KR100797716B1 (ja)
CN (1) CN100498468C (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080205058A1 (en) * 2007-02-27 2008-08-28 Samsung Electro-Mechanics Co., Ltd. Backlight unit having light emititng diodes and method of manufacturing the same
DE102018118116B4 (de) 2017-07-28 2024-04-18 Tdk Corporation Verfahren zur Herstellung eines elektrisch leitfähigen Substrats und einer Anzeigevorrichtung

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102141232A (zh) * 2010-02-02 2011-08-03 上海三思电子工程有限公司 Led照明光源的封装结构及其制作方法
US8373183B2 (en) * 2011-02-22 2013-02-12 Hong Kong Applied Science and Technology Research Institute Company Limited LED package for uniform color emission
CN110136586B (zh) * 2019-05-27 2021-06-01 Oppo广东移动通信有限公司 背光组件、显示模组及电子设备

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR890007620A (ko) * 1987-10-24 1989-06-20 미다 가쓰시게 프린트 회로의 제조방법
JP3361556B2 (ja) * 1992-09-25 2003-01-07 日本メクトロン株式会社 回路配線パタ−ンの形成法
KR19980084566A (ko) * 1997-05-23 1998-12-05 이대원 다층 인쇄회로기판 및 그 제조방법
KR20000036309A (ko) * 1999-12-13 2000-07-05 기승철 도체막을 절단하여 회로부를 성형하는 회로기판의제조방법.
JP2001168398A (ja) 1999-12-13 2001-06-22 Nichia Chem Ind Ltd 発光ダイオード及び製造方法
JP2002184718A (ja) * 2000-12-14 2002-06-28 Nippon Telegr & Teleph Corp <Ntt> インプリント方法及びインプリント装置
JP4138261B2 (ja) * 2001-02-21 2008-08-27 日本ライツ株式会社 光源装置
JP3840921B2 (ja) * 2001-06-13 2006-11-01 株式会社デンソー プリント基板のおよびその製造方法
WO2004071141A2 (en) 2003-02-07 2004-08-19 Matsushita Electric Industrial Co., Ltd. Metal base wiring board for retaining light emitting elements, light emitting source, lighting apparatus, and display apparatus
US7013562B2 (en) * 2003-03-31 2006-03-21 Intel Corporation Method of using micro-contact imprinted features for formation of electrical interconnects for substrates
KR100604819B1 (ko) * 2003-06-12 2006-07-28 삼성전자주식회사 반도체 패키지용 배선 기판, 그 제조방법 및 이를 이용한반도체 패키지
JP3858879B2 (ja) * 2003-09-10 2006-12-20 株式会社デンソー ライトユニット
US7365414B2 (en) * 2003-12-01 2008-04-29 Intel Corporation Component packaging apparatus, systems, and methods
JP4754850B2 (ja) * 2004-03-26 2011-08-24 パナソニック株式会社 Ｌｅｄ実装用モジュールの製造方法及びｌｅｄモジュールの製造方法
KR20050121578A (ko) * 2004-06-22 2005-12-27 삼성전자주식회사 백라이트 유닛
JP2006011239A (ja) * 2004-06-29 2006-01-12 Kyocera Corp 液晶表示装置
US7535107B2 (en) * 2004-10-12 2009-05-19 Salmon Technologies, Llc Tiled construction of layered materials

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080205058A1 (en) * 2007-02-27 2008-08-28 Samsung Electro-Mechanics Co., Ltd. Backlight unit having light emititng diodes and method of manufacturing the same
US7914194B2 (en) * 2007-02-27 2011-03-29 Samsung Led Co., Ltd. Backlight unit having light emititng diodes and method of manufacturing the same
DE102018118116B4 (de) 2017-07-28 2024-04-18 Tdk Corporation Verfahren zur Herstellung eines elektrisch leitfähigen Substrats und einer Anzeigevorrichtung

Also Published As

Publication number Publication date
CN101042498A (zh) 2007-09-26
JP2007256953A (ja) 2007-10-04
KR20070095540A (ko) 2007-10-01
KR100797716B1 (ko) 2008-01-23
US20100227423A1 (en) 2010-09-09
EP1837923A2 (en) 2007-09-26
US8779561B2 (en) 2014-07-15
JP5165913B2 (ja) 2013-03-21
CN100498468C (zh) 2009-06-10
EP1837923A3 (en) 2015-04-01
EP1837923B1 (en) 2018-11-07

Similar Documents

Publication Publication Date Title
EP1913436B1 (en) Light emitting diode package and method of fabricating the same
US8053804B2 (en) Backlight unit equipped with light emitting diodes
KR101283182B1 (ko) 발광 다이오드 패키지 및 그 제조 방법
TWI393241B (zh) 發光裝置、顯示器及其製造方法
KR101303595B1 (ko) 방열 인쇄회로기판, 방열 인쇄회로기판 제조방법, 방열 인쇄회로기판을 포함하는 백라이트 유닛 및 액정표시장치
US8779561B2 (en) LED backlight unit without printed circuit board and method of manufacturing the same
KR20100091384A (ko) 매립 직하형 엘이디 어레이 백라이트 유닛 및 그 제조방법
JP2010103149A (ja) 発光部材、発光装置、電子機器、機械装置、発光部材の製造方法、および発光装置の製造方法
CN111315131A (zh) 电路板及其制作方法
JP2013110288A (ja) サイドビュー型発光装置及びその製造方法
KR101273045B1 (ko) 발광 다이오드 패키지
CN217768371U (zh) MicroLED封装结构
KR101195015B1 (ko) 광패키지 및 그 제조방법
KR101101776B1 (ko) 발광 장치 및 이의 제조방법
KR20090113115A (ko) 대전력 광원 램프를 위한 효과적인 열방출 구조의 리드프레임, 전자 소자 및 그 제조 방법
KR101250405B1 (ko) 광패키지 및 그 제조방법
CN114975391A (zh) MicroLED封装方法、结构
KR20130046312A (ko) 블랑켓 일체형 방열회로기판의 제조 방법 및 제조 장치
CN114765242A (zh) 一种显示装置及其制作方法

Legal Events

Date Code Title Description
AS Assignment

Owner name: SAMSUNG ELECTRO-MECHANICS CO., LTD., KOREA, REPUBL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:JEONG, GI HO;YANG, SI YOUNG;KWON, JAE WOOK;AND OTHERS;REEL/FRAME:019115/0667;SIGNING DATES FROM 20070121 TO 20070221

AS Assignment

Owner name: SAMSUNG LED CO., LTD., KOREA, REPUBLIC OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SAMSUNG ELECTRO-MECHANICS CO., LTD.;REEL/FRAME:024723/0532

Effective date: 20100712

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION