WO2011002078A1 - 半導体発光素子搭載用基板、バックライトシャーシ、表示装置、及び、テレビ受信装置 - Google Patents
半導体発光素子搭載用基板、バックライトシャーシ、表示装置、及び、テレビ受信装置 Download PDFInfo
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- WO2011002078A1 WO2011002078A1 PCT/JP2010/061317 JP2010061317W WO2011002078A1 WO 2011002078 A1 WO2011002078 A1 WO 2011002078A1 JP 2010061317 W JP2010061317 W JP 2010061317W WO 2011002078 A1 WO2011002078 A1 WO 2011002078A1
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- electrode
- substrate
- semiconductor light
- light emitting
- emitting element
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Classifications
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- 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
- H01L33/64—Heat extraction or cooling elements
- H01L33/647—Heat extraction or cooling elements the elements conducting electric current to or from the semiconductor body
-
- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
-
- 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
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133612—Electrical details
-
- 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
- G02F1/1336—Illuminating devices
- G02F1/133628—Illuminating devices with cooling means
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- 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
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
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- 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
Definitions
- the present invention relates to a substrate for mounting a semiconductor light emitting element, a backlight chassis, a display device, and a television receiver, and more specifically, suitable when a flip-chip type semiconductor light emitting element is used as a backlight light source of a liquid crystal display device.
- the present invention relates to a semiconductor light emitting element mounting substrate, a backlight chassis, a display device, and a television receiver.
- LEDs Light Emitting Diodes
- LEDs Light Emitting Diodes
- the side edge method is a method in which an LED is arranged on the side surface of the screen of the video display device and light is incident on the light guide plate.
- the direct method is a method in which LEDs are arranged in a matrix (two-dimensional) form immediately below the screen to directly use the emitted light. Since the direct method is easier to increase the luminance than the side edge method, an LED backlight of a direct method is mainly used in a video display device using a large liquid crystal display element.
- the flip chip type structure that connects to a wiring pattern on a substrate via solder bumps or solder balls.
- the flip chip type structure eliminates the need for a wire for wiring, and thus a wire bonding process is not required, and a small electronic component can be mounted on a substrate in a relatively simple process.
- the flip chip type structure can be made thin, application to an LED backlight is also being studied.
- the LED is a point light source, it is necessary to arrange the light source on the entire surface. And although LED is an efficient light source, in order to use it for the backlight of a liquid crystal display device, it is necessary to make it light-emit with high brightness
- Patent Document 1 discloses a structure in which a thermal via is provided on a substrate on which an LED chip is mounted, and heat generated from the LED is released to the heat dissipation pad provided on the back surface of the substrate via the thermal via.
- Patent Document 2 although an integrated circuit mounting substrate is provided, a heat dissipation pattern is separately provided in a non-formation region of the wiring pattern, and a ground wiring bump or a dummy bump is connected to the heat dissipation pattern, so that the heat of the integrated circuit can be reduced. It is disclosed to transmit to a heat dissipation pattern.
- the LED chip 200 includes a sapphire substrate 201, an N-type layer 202, an active layer 203, a P-type layer 204, a positive electrode (anode electrode) 205, and a negative electrode (cathode electrode) 206.
- FIG. 23 shows a package-type chip structure as another conventional flip-chip type LED chip structure.
- the LED package 300 includes an LED chip 301, a phosphor layer 302, a protective layer 303, a bottom electrode (positive electrode and negative electrode) 304, a via 305, contact pads 305a and 305b, and a silicon submount 306 (for example, (See Patent Document 3).
- the solderability is sufficiently satisfied. Therefore, regardless of the amount of heat generated by the LED, the size of the positive electrode and the negative electrode of the LED is large. The shape was determined in consideration of the current path, current value, and the like.
- Patent Document 1 it is necessary to provide a via hole in the substrate and further to provide a heat dissipation pad on the back surface of the substrate. It was.
- Patent Document 2 can be applied to an integrated circuit in which ground wiring bumps and dummy bumps can be arranged, but it has been difficult to apply to a bipolar element such as an LED.
- the amount of heat radiation from the LED chip to the mounting substrate depends on the electrode area of each electrode.
- the LED chip can be cooled more efficiently by increasing the electrode area of the positive electrode disposed near the active layer. It is considered a thing.
- a liquid crystal display device can be applied to various products, but heat radiation of a backlight portion including a light source is a main part with respect to heat radiation of the entire product. For this reason, the importance of the heat radiating means of the substrate portion on which the light source is mounted is high.
- the size and shape of the positive electrode and the negative electrode of the LED are determined by the current path, the current value, etc. No consideration was given to increasing the heat dissipation effect on the substrate.
- the present invention has been made in view of these circumstances, and as a substrate for mounting a flip-chip type semiconductor light-emitting element, heat from the semiconductor light-emitting element is excellent with a simple structure without increasing the number of manufacturing steps.
- a semiconductor light-emitting element mounting substrate that suppresses temperature rise and improves reliability during manufacturing when mounting a semiconductor light-emitting element
- a backlight chassis equipped with this substrate and a display
- An object is to provide a device and a television receiver.
- a first technical means of the present invention is a semiconductor light emitting device mounting substrate for mounting a semiconductor light emitting device having a positive electrode and a negative electrode on the same plane side, the insulating substrate and A pair of electrode patterns to which the positive electrode and the negative electrode are respectively connected on the insulating substrate; and a wiring pattern drawn from the pair of electrode patterns, each of the pair of electrode patterns being the wiring It is characterized by having a larger area than the pattern.
- the pair of electrode patterns have opposing portions facing each other through a predetermined gap substantially in parallel, and the positive electrode of the semiconductor light emitting element and The negative electrode is connected.
- the insulating substrate has an elongated strip shape
- the pair of electrode patterns extend in the longitudinal direction on the insulating substrate and have different widths
- the semiconductor light emitting device In the pair of electrode pattern portions on which the positive electrode and the negative electrode of the element are placed, at least one of the narrow electrode pattern and the wide electrode pattern has a protruding portion that protrudes toward the other electrode pattern. It is characterized by being formed.
- the electrode farther from the active layer of the positive electrode and the negative electrode of the semiconductor light emitting element is connected to the narrow electrode pattern. It is characterized by being.
- a concave portion is formed on the other electrode pattern side so as to face the protruding portion with a predetermined gap. is there.
- the sixth technical means is the fifth technical means characterized in that the gap between the projecting portion and the concave portion is located at the approximate center in the width direction of the pair of electrode patterns.
- the seventh technical means is characterized in that, in the fifth or sixth technical means, notches are formed on both sides in the longitudinal direction of the concave portion.
- the eighth technical means is characterized in that, in the third to seventh technical means, the protruding portion is stepped.
- the semiconductor light emitting device has a positive electrode and a negative electrode formed on the same surface side, and an electrode area of one electrode is the other. An electrode having a larger electrode area than the electrode area is connected to the wide electrode pattern side.
- the tenth technical means is the ninth technical means characterized in that an electrode having a large electrode area of the semiconductor light emitting device is closer to an active layer than an electrode having a small electrode area.
- the eleventh technical means is characterized in that, in the first or second technical means, the drawing directions of the wiring patterns drawn from each of the pair of electrode patterns are different from each other. .
- the insulating substrate has an elongated strip shape, and a gap between the pair of electrode patterns is parallel to a longitudinal direction of the strip shape. It is characterized by being formed.
- the insulating substrate has a long strip shape, and a plurality of the pair of electrode patterns are provided along a longitudinal direction of the strip shape. A plurality of the semiconductor light emitting elements are formed and can be arranged.
- the power of the semiconductor light emitting element is W (w)
- the area of the pair of electrode patterns is S (m 2 )
- the thickness of the insulating substrate is L.
- M the thermal conductivity of the insulating substrate
- the fifteenth technical means is a backlight chassis including a semiconductor light emitting element mounting substrate which is any one of the first to fourteenth technical means.
- the sixteenth technical means is a display device including a semiconductor light emitting element mounting substrate which is any one of the first to fourteenth technical means.
- the seventeenth technical means is a television receiver provided with a display device which is the sixteenth technical means.
- the electrode pattern of the portion to which the electrode of the semiconductor light emitting element is connected has a larger area than the wiring pattern. For this reason, the heat transmitted from the semiconductor light emitting element to the electrode pattern through the electrode is dissipated from the wide electrode pattern, is well transmitted to the insulating substrate through the wide electrode pattern, and further dissipated through the insulating substrate. Therefore, the semiconductor light emitting element mounting substrate of the present invention can suppress the temperature rise of the semiconductor light emitting element.
- the electrode of the semiconductor light emitting element far from the active layer is connected to the protruding portion formed on the narrow electrode pattern side, and the wide electrode is opposed to the protruding portion with a gap. Since the electrode of the semiconductor light emitting element closer to the active layer can be connected to the pattern portion, the heat from the semiconductor light emitting element can be efficiently transferred from both electrodes to the insulating substrate through each electrode pattern. Therefore, the semiconductor light emitting element mounting substrate of the present invention can efficiently suppress the temperature rise of the semiconductor light emitting element.
- the protruding portion is formed in the electrode pattern, the reliability of reflow can be improved when each electrode of the semiconductor light emitting element is connected to the electrode pattern using a solder paste.
- the heat generation is favorably dissipated to the substrate side with a simple structure and mounted on the substrate. The temperature rise can be suppressed.
- FIG. 1 It is a disassembled perspective view which shows schematic structure of the television receiver which concerns on one Embodiment of this invention. It is a disassembled perspective view which shows schematic structure of the liquid crystal display device with which a television receiver is provided. It is a figure which shows the example which used the board
- FIG. 16 is a view showing a cross section taken along line XX when an LED chip is mounted on the semiconductor light emitting element mounting substrate shown in FIG. 15; It is the figure which looked at the LED chip shown in FIG. 16 from the Y direction. It is a figure which shows the board
- FIG. 1 is an exploded perspective view showing a schematic configuration of a television receiver according to an embodiment of the present invention
- FIG. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver.
- the television receiver 100 includes a liquid crystal display device 110, front and back cabinets 111 and 112 that are accommodated with the liquid crystal display device 110 interposed therebetween, a power source 113, a tuner 114, and a stand 115. Configured.
- the liquid crystal display device (display device) 110 has a horizontally long rectangular shape (rectangular shape) as a whole, and is accommodated in a vertically placed state. As shown in FIG. 2, the liquid crystal display device 110 includes a liquid crystal panel 120 as a display panel and a backlight device (illumination device) 130 as an external light source, which are integrated by a frame-like bezel 140 or the like. Is supposed to be retained.
- FIG. 2 illustrates a liquid crystal display device having a screen size of 42 inches and an aspect ratio of 16: 9.
- the liquid crystal panel 120 has a configuration in which a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates.
- One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, an alignment film, and the like.
- the other glass substrate is provided with a color filter, a counter electrode, an alignment film, and the like in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement.
- the backlight device 130 is attached so as to cover a substantially box-shaped backlight chassis 150 opened on the light emitting surface side (the liquid crystal panel 120 side) and the opening of the backlight chassis 150.
- the optical member 160 including the optical sheet group 162 disposed on the light emission surface side further than the diffusion plate 161.
- the optical member 160 is held by the backlight chassis 150 and a frame 170 disposed along the periphery of the backlight chassis 150.
- FIG. 3 is a diagram showing an example in which the semiconductor light emitting element mounting substrate according to the present invention is used in a backlight device of a liquid crystal display device.
- a plurality of semiconductor light emitting element mounting substrates (hereinafter referred to as LED substrates) 1 according to the present invention are arranged on a backlight chassis 150.
- Each LED substrate 1 has a plurality of LED chips 2 mounted in a straight line (array) and has a long strip shape, and the longitudinal direction coincides with the horizontal direction of the screen of the liquid crystal display device. Are arranged to be.
- FIG. 3 illustrates an array type LED backlight device 130 applied to a 42-inch wide screen (horizontal 930 mm ⁇ vertical 523 mm) video display device.
- the LED board 1 has maximum horizontal and vertical outer dimensions at the time of manufacture, that is, a standard.
- the standard length varies depending on the material of the LED substrate 1 and the manufacturing apparatus, but is, for example, 510 mm in length and 340 mm in width.
- the mounting substrate 1 is divided into several parts.
- the mounting substrate in order to exceed this standard, is divided into two in the horizontal direction, and two LED substrates 1 in total, 10 in the horizontal direction and 10 in the vertical direction, are arranged.
- eight LEDs 2 are arranged on the same straight line on each LED substrate 1.
- the backlight device 130 of FIG. 3 uses a total of 160 LED chips 2 over the entire screen.
- the interval between adjacent LED chips 2 is 60 mm, and the LED chips 2 are arranged in a hexagonal lattice as a whole.
- another LED chip 2 is arranged at the apex of a virtual regular hexagon formed around a certain LED chip 2.
- the LED backlight apparatus 130 can irradiate a uniform backlight light with respect to a liquid crystal panel.
- ten harnesses 102 are provided in order to make electrical connection between the LED substrates 1 divided into two in the horizontal direction. Further, ten harnesses 103 are provided to electrically connect one of the LED boards 1 to an external driver board (not shown). These harnesses 102 and 103 are connected to a connector 104 provided on each LED board 1.
- the backlight device 130 provided on the back surface of the liquid crystal panel 120 there is a matrix type LED backlight device configured by laying a large number of LED chips in a matrix on a substrate having approximately the same area as the screen size.
- the matrix-type LED backlight device requires a substrate having an area substantially the same as the screen size, the member price becomes very expensive.
- an array type LED backlight device requires a plurality of LED substrates 1, but they are arranged at intervals from each other, so that the larger the liquid crystal display device of a larger screen, the more the matrix type LED backlight. It can be manufactured at a lower cost than the device.
- the array-type LED backlight device can be applied to various screen sizes by increasing or decreasing the number of LED substrates 1 according to the screen size.
- FIG. 4 is a diagram showing a semiconductor light emitting element mounting substrate according to an embodiment of the present invention.
- the LED board 1 has a pair of rectangular electrode patterns 4 and 5 for connecting electrodes of LED chips to be described later on an insulating board 3 made of an epoxy resin or the like having a long strip shape, and the pair.
- Wiring patterns 6 respectively drawn from the electrode patterns 4 and 5.
- the pair of electrode patterns 4 and 5 and the wiring pattern 6 are formed to have substantially the same thickness, but the pair of electrode patterns 4 and 5 are formed to have a larger area than the wiring pattern 6. .
- the pair of electrode patterns 4 and 5 have a facing portion A that is opposed substantially in parallel through a predetermined gap, and the LED chip 2 is mounted on the facing portion A using solder or the like.
- the LED chip 2 is mounted in the approximate center of the width direction of a strip-shaped LED board.
- the facing portion A is formed along the longitudinal direction of the LED substrate 1 (left and right direction in FIG. 4).
- the drawing directions of the wiring patterns 6 drawn from the pair of electrode patterns 4 and 5 are different from each other.
- the positive and negative electrodes of the LED chip 2 mounted on the facing portion A are mounted along the longitudinal direction of the LED substrate 1.
- the placement length can be increased. For this reason, even when the LED substrate 1 is handled, even when the LED substrate 1 is bent in the longitudinal direction, the stress applied to the connection portion of the mounted LED chip 2 and the electrode patterns 4 and 5 of the LED substrate 1 is reduced, and the connection of the LED chip is reduced. Defects can be reduced.
- the width of the wiring pattern 6 is determined by the maximum value of the current passed through the LED chip 2, but the area of the electrode patterns 4 and 5 is when the maximum current is passed through the LED chip 2 as will be described later. It is determined from the temperature rise.
- the electrode patterns 4 and 5 are distinguished from the wiring pattern 6 when the narrow portion perpendicular to the direction of current flow is the wiring pattern 6 and the facing portion A on which the LED chip 2 is mounted is short-circuited. It can be distinguished that the wide portions perpendicular to the current flow direction are the electrode patterns 4 and 5.
- the electrode patterns 4 and 5 and the wiring pattern 6 are made of copper (Cu).
- Cu copper
- various general methods can be used in addition to forming both by etching from a copper foil provided on the insulating substrate 3.
- metal foil of materials other than copper for example, gold
- FIG. 5 is a view showing a cross section taken along the line XX when the LED chip is mounted on the semiconductor light emitting element mounting substrate shown in FIG.
- the LED chip 2 has a structure in which an AlInGa-based N-type layer 22, an active layer 23, and a P-type AlInGaN layer 24 are stacked on an insulating transparent sapphire substrate 21.
- the positive electrode 25 on the anode side provided on the P-type layer 24 and the negative electrode 26 on the cathode side provided on the N-type layer 22 are connected to a pair of electrode patterns 4 and 5, respectively.
- the active layer 23 emits light by flowing a forward current to the outside, and light is extracted outside through the sapphire substrate 21.
- the flip chip type LED chip 2 has the positive electrode 25 and the negative electrode 26 formed on the LED chip 2 on the electrode patterns 4 and 5 of the LED substrate 1 without using bonding wires or leads, respectively.
- a structure is adopted in which they are directly opposed and closely bonded.
- the structure of the LED chip 2 is not limited to this example as long as it is of a flip chip type, and any structure may be used.
- the heat generated from the LED chip 2 is transmitted from the positive electrode 25 and the negative electrode 26 to the electrode patterns 4 and 5, respectively, and is further insulated through the electrode patterns 4 and 5. It is transmitted to the substrate 3. Moreover, since the insulating substrate 3 is attached to a backlight chassis (backlight chassis 150 shown in FIG. 3) (not shown), heat is further transferred to the backlight chassis via the insulating substrate 3. In the present invention, since the area of the electrode patterns 4 and 5 in the portion where the LED chip 2 is placed is widened, the heat from the LED chip 2 is radiated from the electrode patterns 4 and 5 itself to the outside and is insulated. Since it conducts to the substrate 3 over a wide area, it is transmitted well to the backlight chassis, and the temperature rise of the LED chip 2 can be suppressed.
- the heat radiation efficiency of the heat from the heat source varies depending on the size and thickness of the substrate.
- a point light source element such as an LED
- the electrode portion of the LED chip when a large current is passed through a point light source element such as an LED, the electrode portion of the LED chip
- the temperature distribution in the vicinity of the electrode is greatly influenced by the size and shape of the electrode pattern and the wiring pattern.
- the thermal conductivity is about 1 W / (m ⁇ K) for epoxy resin and about 400 W / (m ⁇ K) for copper. Therefore, the distribution of the heat flux transmitted from the LED chip 2 to the insulating substrate 3 varies greatly depending on the size and shape of the electrode patterns 4 and 5, and the amount of heat that can be released to the insulating substrate 3 as the electrode pattern becomes wider. Will grow.
- the electrode patterns 54 and 55 have the same width as the wiring pattern 6, heat from the LED chip 2 is insulated through the electrode patterns 54 and 55. What is transmitted to 3 is not enough. Therefore, the temperature distribution of the LED chip 2 becomes extremely high in the vicinity of the LED chip 2, and the light emission efficiency of the LED chip 2 is deteriorated. Moreover, the current value that can be passed through the LED chip 2 must be kept small.
- the change in LED temperature when the size of the electrode pattern is changed using a thermal circuit network with the LED chip as a heat source and The change in the heat flow rate of the electrode pattern was determined.
- FIG. 6 is a diagram showing a model used for obtaining a change in LED temperature and a change in the heat flow rate of the electrode pattern.
- the model 60 is obtained by sequentially stacking a backlight chassis 65, a back surface pattern 64, an insulating substrate 63, an electrode pattern 62, and an LED chip 61.
- LED chip 61 A square with a side of 2.8 mm and a power of 0.68 W.
- Electrode pattern 62 A copper foil having a thickness of 35 ⁇ m and a thermal conductivity of 390 W / (m ⁇ K).
- Insulating substrate 63 high thermal conductivity type, thickness 1 mm, area 50 mm ⁇ 30 mm, thermal conductivity 1 W / (m ⁇ K).
- Back surface pattern 64 A copper foil having a thickness of 35 ⁇ m, a thermal conductivity of 390 W / (m ⁇ K), an area the same as that of the insulating substrate 63, and a back surface pattern 64 provided on the entire back surface of the insulating substrate 63. It was supposed to be.
- Backlight chassis 65 It is made of iron and has a thickness of 0.8 mm, a thermal conductivity of 50 W / (m ⁇ K), and a sufficient area.
- FIG. 7 is a diagram illustrating a conceptual diagram when a simulation of heat conduction, heat transfer, and heat radiation is performed as a thermal network. The simulation was performed for heat conduction, heat transfer, and heat radiation as shown in FIG. Heat conduction is mainly heat transfer in a substance, and heat transfer is mainly heat transfer on the surface of a substance. Thermal radiation is heat transfer as a heat ray.
- the temperature of the LED chip 61 and the heat flow rate of the electrode pattern 62 when the temperature of the air 66 was 25 ° C. were obtained.
- the temperature of the LED chip 61 was set equal to the average temperature of the electrode pattern 62.
- FIG. 8 is a graph showing the results of the simulation, where the area of the electrode pattern 62 is taken on the X axis, the temperature of the LED chip 61 (the average temperature of the electrode pattern 62), and the average heat flow rate of the electrode pattern 62 on the Y axis.
- the heat flow rate is the amount of heat transferred per unit area. The greater the heat flow rate, the greater the amount of temperature change per unit area. Therefore, if the heat flow rate value on the electrode pattern 62 can be lowered, the amount of temperature change is reduced, and as a result, the temperature of the LED chip 61 is lowered.
- the average temperature of the back surface pattern 64 is about 42.3 ° C., which is substantially the same for each electrode pattern.
- the electrode pattern 62 is plotted from the left mark to a square with a side of 6 mm, a square with a side of 7 mm,..., A square with a side of 15 mm.
- the LED chip temperature is about 60 ° C. and the heat flow rate is about 18000 W / m 2.
- the area of the electrode pattern 62 increases, the temperature of the LED chip and the heat flow rate of the electrode pattern decrease. Go. It can be seen that after the electrode pattern has a square shape with a side of 11 mm, the temperature change is small and the electrode pattern is saturated.
- the average values are plotted for the LED chip temperature (electrode pattern temperature), back surface pattern temperature, and heat flow rate, but the calculation is simplified by estimating the temperature etc. on the basis of the average value. Yes.
- FIG. 9 is a graph in which a value obtained by dividing the W number of the LED chip by the area of the electrode pattern is estimated as a heat flow rate value. It can be seen that the heat flow rate values in FIGS. 8 and 9 are substantially the same.
- FIG. 10 is a diagram for schematically explaining the heat moving through the insulating substrate.
- the thermal conductivity of the insulating substrate 63 is as low as 1 W / (m ⁇ K) even if it is a high thermal conductivity type.
- the back surface pattern 64 on the back surface side of the insulating substrate 63 is 390 W / (m ⁇ K), the amount of heat transferred on the insulating substrate 63 in the longitudinal direction (plane direction) of the insulating substrate 63.
- the amount of movement to the back side of the insulating substrate 63 is much larger than that. Therefore, it can be estimated that most of the heat moves as shown in FIG. That is, it can be presumed that the portion of the insulating substrate 63 where the electrode pattern 62 is not provided does not contribute to heat dissipation by heat conduction from the LED chip 61 to the backlight chassis 65.
- changing the area of the electrode pattern 62 can be rephrased as changing the area of the insulating substrate 63 through which heat is transferred.
- the thermal resistance value of the insulating substrate 63 can be calculated from the area of the electrode pattern 62, the thickness of the insulating substrate 63, and the heat transfer rate of the insulating substrate 63. This is because it is assumed that the heat of the LED chip 61 is equalized by the electrode pattern 62.
- Temperature difference ⁇ T W ⁇ R (Formula 1)
- R is a thermal resistance value (length / cross-sectional area / thermal conductivity).
- FIG. 11 is a graph in which the relationship between the electrode pattern area and the temperature difference between one surface and the other surface of the insulating substrate is estimated.
- the power W of the LED chip 61 is 0.68 W
- the area of the electrode pattern 62 is The temperature difference is plotted every 1 mm from a square with a side of 6 mm to a square with a side of 15 mm. It can be seen that the change in the LED chip temperature shown in FIG. 8 and the change in the temperature difference between one surface and the other surface of the insulating substrate shown in FIG.
- ⁇ T W ⁇ L / S / ⁇ (Formula 2)
- the relationship between the electrode pattern area S and ⁇ T when the power W of the heat generation source is 0.68 W
- the thickness of the insulating substrate 63 is 1 mm
- the thermal conductivity ⁇ of the insulating substrate 63 is 1 W / (m ⁇ K).
- the area S of the electrode pattern is 36 mm 2
- the 6 mm square electrode pattern is almost the same as the area of a normal electrode pattern. Therefore, this temperature difference of 18.8 ° C. is considered as a temperature difference when the present invention is not used.
- ⁇ T1 12.2 ° C., which is about 12 ° C. Therefore, if ⁇ T obtained by Equation 2 is larger than 12 ° C., it is a normal electrode pattern range, and if it is 12 ° C. or less, it is considered that the electrode pattern is conscious of heat dissipation.
- the area of the electrode pattern 62 for suppressing the temperature of the electrode pattern 62 to 65 ° C., which is + 5 ° C., is calculated.
- the substrate is a highly heat conductive member. This is because if the thermal conductivity of the substrate is extremely low, heat from the electrode pattern does not flow to the substrate and heat dissipation cannot be performed smoothly.
- a heat radiating member is attached to the back surface of the substrate. Or the back surface is in contact with the heat dissipation part such as the backlight chassis. This is because if the heat of the substrate is not smoothly discharged from the back surface, the difference between the temperature of the electrode pattern and the temperature of the back surface of the substrate becomes large, and the difference between the estimated value becomes large.
- a backlight chassis is covered with a back cover, and has a structure in which heat is radiated to the outside by convection between the back cover and the backlight chassis.
- the temperature of the backlight chassis be set to about 60 ° C. or less. And it is desirable to keep the temperature difference between the front and back of the LED substrate within 5 ° C.
- FIG. 12 is a view showing a semiconductor light emitting element mounting substrate according to another embodiment of the present invention.
- the LED board 1 shown in FIG. 12 is obtained by changing the wiring pattern 6 of the LED board 1 shown in FIG. Since this wiring pattern 36 connects the same side in the width direction with the adjacent electrode patterns 4 and 5, that is, the upper side and the upper side, and the lower side and the lower side, the LED chip 2 placed on the electrode patterns 4 and 5.
- the positive electrodes and the negative electrodes are alternately arranged between adjacent persons.
- FIG. 13 is a view showing a semiconductor light-emitting element mounting substrate according to still another embodiment of the present invention.
- the LED substrate 1 shown in FIG. 13 has a pair of rectangular electrode patterns 34 and 35 for connecting the electrodes of the LED chip 2 on an insulating substrate 3 having an elongated strip shape and made of epoxy resin or the like.
- a wiring pattern 46 drawn from each of the pair of electrode patterns 34 and 35 is provided.
- the pair of electrode patterns 34 and 35 and the wiring pattern 46 are formed to have substantially the same thickness, but the pair of electrode patterns 34 and 35 are formed to have a larger area than the wiring pattern 46. .
- the pair of electrode patterns 34 and 35 have a facing portion A that is opposed substantially in parallel with a predetermined gap, and the LED chip 2 is mounted on the facing portion A.
- the LED chip 2 is placed at substantially the center in the width direction of the strip-shaped LED substrate, and the electrodes of the LED chip 2 are arranged along the longitudinal direction of the LED substrate 1.
- the LED substrate 1 shown in FIG. 13 is different from the LED substrate 1 shown in FIG. 4 in specific electrode patterns and wiring patterns, but the heat dissipation mechanism from the LED chip 2 and other configurations are the same. Therefore, detailed description is omitted.
- FIG. 14 is a view showing a substrate for mounting a semiconductor light emitting device according to still another embodiment of the present invention.
- the LED substrate 1 shown in FIG. 14 is different from the LED substrate 1 shown in FIG. 13 in that the pair of electrode patterns 44 and 45 are semicircular, but the other configurations are the same.
- the LED chip 2 is mounted on the substantially parallel facing portion A of the pair of electrode patterns 44 and 45, heat from the LED chip 2 is transmitted radially around the electrode portion of the LED chip 2. By making 44 and 45 into circular arc shape, it is preventing that the temperature of LED chip 2 vicinity becomes high.
- FIG. 15 is a view showing a semiconductor light emitting element mounting substrate according to still another embodiment of the present invention.
- FIG. 15A is a partial schematic view of the semiconductor light emitting element mounting substrate, and
- FIG. ) Is an enlarged view of a part of FIG.
- the LED substrate 1 has a pair of electrode patterns 14 and 15 for connecting electrodes of an LED chip to be described later on an insulating substrate 3 having an elongated strip shape and made of epoxy resin or the like.
- the electrode patterns 14 and 15 each extend in the longitudinal direction.
- the width W1 of one electrode pattern 14 is formed to be, for example, about twice as wide as the width W2 of the other electrode pattern 15.
- the pair of electrode patterns 14 and 15 have a facing portion A that is opposed substantially in parallel with a predetermined gap, and the facing portion A protrudes from the narrow electrode pattern 15 to the wide electrode pattern 14 side.
- a protruding portion 15a is formed, and a concave portion 14a is formed on the wide electrode pattern 14 side so as to face the protruding portion 15a with a predetermined gap B therebetween.
- the electrodes of the flip-chip type LED chip 2 are connected by soldering or the like to the protruding portion 15a of the electrode pattern 15 and the portion where the protruding portion 15a and the recessed portion 14a of the electrode pattern opposed to the protruding portion 15a via the gap B are formed.
- the gap B between the protruding portion 15a of the electrode pattern 15 and the concave portion 14a of the electrode pattern facing the protruding portion 15a is located at the approximate center in the width direction of the pair of electrode patterns, the LED chip 2 is also a pair of The electrode pattern is placed at substantially the center in the width direction.
- the width W1 of the electrode pattern 14 is different from the width W2 of the electrode pattern 15 because the heat from the LED chip 2 is efficiently passed through the electrode patterns 14 and 15 as described later.
- the reason why the protrusion 15a is provided is to increase the reliability in the reflow process when the LED chip 2 is connected to the electrode patterns 14 and 15 by the solder paste. .
- a plurality of pairs of electrode patterns 14 and 15 are formed along the longitudinal direction of the insulating substrate 3 so that a plurality of LED chips 2 can be mounted.
- the wide electrode 14 and the narrow electrode 15 are respectively formed on the same side in the width direction of the insulating substrate 3, and the wide electrode 14 is arranged so that the mounted LED chips 2 are connected in series.
- the width 16 of the wiring pattern is narrower than the width of the electrode patterns 14 and 15, and the area of the wiring pattern 16 is smaller than the area of the electrode patterns 14 and 15.
- the positive and negative electrodes of the LED chip 2 are placed along the longitudinal direction of the LED substrate 1. The length can be increased, and even when the LED substrate 1 is handled, even when the LED substrate 1 is bent in the longitudinal direction, the stress applied to the connection portion between the electrode of the mounted LED chip 2 and the electrode patterns 14 and 15 of the LED substrate 1 is small. Thus, connection failure of the LED chip 2 can be reduced.
- FIG. 16 is a cross-sectional view taken along the line XX when the LED chip is mounted on the semiconductor light emitting element mounting substrate shown in FIG.
- FIG. 17 is a view of the LED chip shown in FIG. 16 viewed from the Y direction. Since the configuration of the LED chip 2 is basically the same as the configuration of the LED chip 2 shown in FIG. 5, a detailed description is omitted, but in this embodiment, the LED chip 2 is provided in the P-type layer 24 for the reason described later.
- the area of the positive electrode 25 ′ is larger than the area of the negative electrode provided on the N-type layer 22.
- the positive electrode 25 ′ and the negative electrode 26 are also called bump electrodes, but each is made of a material that can make good ohmic contact with the P-type layer and the N-type layer of the LED chip 2, and the LED chip 2 is made of a compound semiconductor material.
- a multilayer electrode structure can be employed.
- the active layer 23 is caused to emit light by flowing a forward current from the positive electrode 25 ′ to the negative electrode 26, and light is extracted outside through the sapphire substrate 21.
- reflow soldering is performed so that the positive electrode 25 ′ and the negative electrode 26 of the LED chip 2 are in close contact with and bonded to the electrode patterns 14 and 15.
- a solder paste is printed in advance on the pattern electrodes 14 and 15 where the positive electrode 25 ′ and the negative electrode 26 are in close contact with each other, and the positive electrode 25 ′ and the negative electrode 26 are respectively placed on the printed solder paste.
- the LED chip 2 is placed on the LED substrate 1 in the positioned state. Thereafter, the LED substrate 1 and the LED chip 2 are preheated (preheated) in a reflow furnace. This preheating temperature is generally about 150 to 170 ° C.
- the temperature is raised for a short time to a temperature at which the solder melts, and the pattern electrodes 4 and 5 and the respective electrodes of the LED chip 2 are soldered.
- the main heating is generally performed at 220 ° C. to 260 ° C., although the melting temperature varies depending on the component composition of the solder.
- the main heating needs to be performed in a short time in order to reduce the influence of heat on the LED element 2 and the LED substrate 1.
- the portion on which the solder paste is printed is advanced.
- a protrusion 5a is provided in order to increase the temperature.
- fever from the LED chip 2 effectively at the time of the drive of the LED chip 2 are Although it is contradictory, the time in the high temperature state in the reflow is very short (about 10 seconds), and the temperature at the time of driving the LED chip 2 is lower than the temperature at the time of the reflow. However, the influence on the heat radiation by the protruding portion 15a of the electrode pattern 15 is not great.
- the current flows through the path of the electrode pattern 14, the positive electrode 25 ′, the P-type layer 24, the active layer 23, the N-type layer 22, the negative electrode 26, and the electrode pattern 5.
- heat is generated in each part, it is considered that heat is mainly generated in the active layer 23.
- the positive electrode 25 ′ can be provided on the entire surface of the P-type layer 24, while the negative electrode 26 is provided with an N-type layer 22 in consideration of insulation. It can be provided only on a part of the exposed surface.
- the heat from the LED chip 2 is more efficiently released from the positive electrode 25 'to the outside than from the negative electrode 26 in the LED side close to the active layer 23, that is, in the LED chip 2 shown in FIG. Can dissipate heat. From this, in the LED chip 2 shown in FIG. 5 or FIG. 16, it can be said that the positive electrodes 25 and 25 ′ are electrodes having a larger heat dissipation effect than the negative electrode 26.
- the width of the electrode pattern 14 to which the positive electrode 25 ′ close to the active layer 23 is connected is larger than the width of the electrode pattern 15 to which the negative electrode 26 is connected, thereby generating heat from the LED 2. Is effectively transmitted to the insulating substrate 3 through the electrode patterns 14 and 15. That is, of the electrodes of the LED chip 2, the electrode having the larger heat dissipation effect is connected to the wider electrode pattern side.
- the N-type layer 22 and the P-type layer 24 have a higher resistance and a higher calorific value because the P-type layer 24 has a lower conductivity. For this reason, it is necessary to dissipate the heat generated in the P-type layer 24.
- the insulating substrate 3 can be effectively formed. It can dissipate heat.
- the concave portion 14a is formed on the wide electrode pattern 14 side so as to face the protruding portion 15a from the narrow electrode pattern 15 with a predetermined gap B therebetween.
- the area of the electrode pattern 14 is sufficient, it is not necessary to form the recess 14a.
- a protruding portion that faces the protruding portion 15a from the electrode pattern 15 may be formed on the electrode pattern 14 side to increase the reliability in the reflow process.
- FIG. 18 is a view showing a semiconductor light emitting element mounting substrate according to still another embodiment of the present invention.
- FIG. 18A is a partial schematic view of the semiconductor light emitting element mounting substrate, and FIG. ) Is an enlarged view of a part of FIG.
- the LED substrate 1 shown in FIG. 18 differs from the LED substrate 1 shown in FIG. 16 in that a protruding portion 14c is formed in a portion where the positive electrode 25 ′ of the LED chip 2 is placed. .
- the protruding portion 14c of the electrode pattern 14 can also increase the temperature of the printed solder paste earlier, and the reflow reliability can be further increased.
- FIG. 19 is a view showing a semiconductor light emitting element mounting substrate according to still another embodiment of the present invention.
- FIG. 19A is a partial schematic view of the semiconductor light emitting element mounting substrate, and FIG. ) Is an enlarged view of a part of FIG. 19, the LED substrate 1 shown in FIG. 19 has a protruding portion 15a formed in a narrow electrode pattern 15 out of a pair of electrode patterns 14 and 15, in a stepped manner, compared to the LED substrate 1 shown in FIG. The difference is that a step 15b is provided.
- a recess 14d is provided on the side of the electrode pattern 14 facing the step 15b.
- the width of the step 15b provided on the protruding portion 15a of the electrode pattern 15 can be larger in the longitudinal direction than the tip of the protruding portion 15a, the negative electrode 26 soldered to the protruding portion 15a of the electrode pattern 15 can be used. This heat is more easily transferred to the insulating substrate 3 through the wide step 15 b and the electrode pattern 15.
- step difference was demonstrated, what is necessary is just the shape in which the heat from an electrode is efficiently transferred to an insulated substrate via an electrode pattern. That is, it suffices if the area of the protrusion increases as it goes from the tip of the protrusion toward the electrode pattern side. For example, a trapezoidal shape having a short side at the tip or a semicircular shape may be used.
- the positive electrode of the flip chip type LED chip 2 is solder-bonded to the wide pattern electrode and the negative electrode is solder-bonded to the narrow electrode pattern.
- the electrode on the side close to the active layer may be soldered to a wide electrode pattern.
- a chip structure in which the order of the N-type layer 22 and the P-type layer 24 is reversed may be used. That is, when a chip structure of a P-type layer, an active layer, and an N-type layer is sequentially formed from the sapphire substrate, the negative electrode is disposed closer to the active layer than the positive electrode. In this case, the electrode area of the negative electrode may be made larger than the electrode area of the positive electrode.
- FIG. 20 is a view showing a cross section of a semiconductor light emitting device having an LED package structure.
- the LED package 70 includes an LED chip 71, a phosphor layer 72, a protective layer 73, a positive electrode 74a, a negative electrode 74b, a via 75, contact pads 75a and 75b, and a silicon submount 76.
- a method for manufacturing the LED package 70 will be briefly described. First, a silicon submount 76 having at least one groove is formed by wet etching. Then, two vias 75 are provided at the bottom of the groove of the silicon submount 76. Contact pads 75a and 75b are provided above each via 75, and a positive electrode 74a and a negative electrode 74b are provided below. In the case of this example, the positive electrode 74a and the negative electrode 74b are connected to the P-type layer and the N-type layer of the LED chip 71 via the via 75, respectively.
- the LED chip 71 is mounted in the groove of the silicon submount 76. At this time, the electrodes of the LED chip 71 are bonded to and electrically connected to the contact pads 75a and 75b. Then, the phosphor layer 72 is filled in the groove of the silicon submount 76 to form an upper surface, and a protective layer 73 is formed on the upper surface by printing.
- the positive electrode 74a and the negative electrode 74b are connected to the electrode patterns 14 and 15 on the mounting substrate of the LED package 70.
- the electrode area of the positive electrode 74a (anode) is made larger than the electrode area of the negative electrode 74b (cathode).
- the structure of the semiconductor light emitting element mounted on the semiconductor light emitting element mounting substrate according to the present invention may be either the flip chip type LED chip 2 or the LED package 70 having the package structure described above. Further.
- the present invention is not limited to the flip chip type, and can be applied to, for example, a wire bonding type chip structure.
- the liquid crystal display device has been described as the display device including the semiconductor light emitting element mounting substrate of the present invention.
- a liquid crystal display device can be applied to various uses, for example, a television receiver.
- the information device may be connected with a cable such as DSUB (D-subminiature), and may display video data of the information device, or may be integrally formed as an information device.
- DSUB D-subminiature
- the display unit may be used in the vertical position.
- LED chip 72, 302 ... phosphor layer, 73, 303 ... protective layer, 74a ... positive electrode, 74b ... negative electrode, 75, 305 ... via, 75a, 75b, 305a, 305b ... contact pad 76, 306 ... Silicon submount, 100 ... Television receiver, 102, 103 ... Harness, 104 ... Connector, 110 ... Liquid crystal display, 111, 112 ... Cabinet, 113 ... Power source, 114 ... Tuner, 115 ... Stand, 120 ... Liquid crystal panel, 130 ... Backlight device, 140 ... Bezel, 150 ... Backlight chassis, 160 ... Optical member, 161 ... Diffuser, 162 ... Optical sheet group, 170 ... Frame, 304 ... Bottom electrode.
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Abstract
Description
また、本発明によれば、半導体発光素子を構成する正電極または負電極のいずれかの電極面積を大きくすることにより、簡単な構造で発熱を良好に基板側に放熱し、基板に実装した際に温度上昇を抑えることができる。
図1は、本発明の一実施形態に係るテレビ受信装置の概略構成を示す分解斜視図であり、図2は、テレビ受信装置が備える液晶表示装置の概略構成を示す分解斜視図である。
バックライト装置130は、バックライトシャーシ150上に、本発明に係る半導体発光素子搭載用基板(以下、LED基板という。)1を複数配置している。個々のLED基板1は、直線状(アレイ状)に複数のLEDチップ2を搭載しているとともに、長尺の短冊形状を有しており、長手方向が液晶表示装置の画面の水平方向に一致するように配置されている。
LED基板1は、長尺の短冊形状を有しエポキシ樹脂等からなる絶縁基板3の上に、後述するLEDチップの電極を接続するための一対の矩形状の電極パターン4,5 及び、この一対の電極パターン4,5からそれぞれ引き出された配線パターン6を有している。そして、一対の電極パターン4,5と配線パターン6とはほぼ同じ厚みに形成されているが、一対の電極パターン4,5の方が配線パターン6よりも面積が大きくなるように形成されている。
LEDチップ2は、一例として、絶縁性の透明のサファイア基板21上にAlInGa系のN型層22、活性層23、P型AlInGaN層24を積層した構造を有している。そして、P型層24に設けたアノード側の正電極25とN型層22に設けたカソード側の負電極26とをそれぞれ一対の電極パターン4,5に接続し、正電極25から負電極26へ順方向電流を流すことによって活性層23を発光させ、サファイア基板21を通して外部に光を取り出している。
モデル60は、バックライトシャーシ65、裏面パターン64、絶縁基板63、電極パターン62、LEDチップ61を順次積み重ねたものである。
LEDチップ61:一辺2.8mmの正方形とし、電力0.68Wとした。
電極パターン62:厚さ35μmの銅箔で熱伝導率390W/(m・K)とした。
絶縁基板63:高熱伝導タイプで厚さ1mm、面積は50mmx30mm、熱伝導率は1W/(m・K)とした。
裏面パターン64:厚さ35μmの銅箔で、熱伝導率は390W/(m・K)であり、面積は絶縁基板63と同じとし、絶縁基板63の背面に全面に裏面パターン64が設けられているものとした。
バックライトシャーシ65:鉄製で厚さ0.8mm、熱伝導率は50W/(m・K)で十分な面積があるものとした。
図7は、熱回路網として、熱伝導、熱伝達、熱放射のシミュレーションを行う際の概念図を示す図である。シミュレーションは図7で示すように熱伝導、熱伝達、熱放射について行った。熱伝導とは主に物質内の熱移動であり、熱伝達とは、主に物質の表面上の熱移動である。また、熱放射は、熱線としての熱移動である。このシミュレーションでは、空気66の温度を25℃とした場合のLEDチップ61の温度と電極パターン62の熱流速を求めた。ただし、LEDチップ61の温度は電極パターン62の平均温度と等しいものとした。
ここで熱流速とは、単位面積当たりの熱の移動量である。熱流速が大きければそれだけ単位面積あたりの温度変化量が大きくなる。したがって、電極パターン62上の熱流速値を下げることができれば、温度変化量が減り、結果的にLEDチップ61の温度が下がる。
電極パターン62が一辺6mmの正方形では、LEDチップ温度が60℃程度、熱流速が18000W/m2程度であり、電極パターン62の面積が大きくなるとLEDチップの温度、電極パターンの熱流速とも下がっていく。電極パターンが一辺11mmの正方形程度以降は温度変化も小さくなり、飽和状態であることが分かる。
次に、熱伝導のみと考えると、LEDチップ61からの熱は絶縁基板63の表側の電極パターン62を設けた部分全体に広がることになる。これは、電極パターン62の熱伝導率が絶縁基板63の熱伝導率よりも大幅に高いからである。
図8及び図9における熱流速値はほぼ同じ値となっていることが分かる。
図10は、絶縁基板を移動する熱を模式的に説明するための図である。
絶縁基板63の熱伝導率は、高熱伝導タイプであっても、1W/(m・K)と極めて低い。これに対して、絶縁基板63の裏面側の裏面パターン64は、390W/(m・K)であることから、絶縁基板63上の熱は絶縁基板63の長手方向(平面方向)に移動する量よりも、絶縁基板63の裏面側に移動する量のほうがはるかに多いと考えられる。したがって、大部分の熱は図10に示すように移動すると推定できる。すなわち、絶縁基板63の電極パターン62を設けていない部分は、LEDチップ61からバックライトシャーシ65への熱伝導による放熱に寄与していないと推定できる。
温度差ΔT=W・R (式1)
Rは熱抵抗値(長さ/断面積/熱伝導率)である。
ΔT=W・L/S/ρ (式2)
例として、発熱源の電力Wが0.68W、絶縁基板63の厚さが1mm、絶縁基板63の熱伝導率ρが1W/(m・K)の際の電極パターン面積SとΔTの関係を見る。
まず、通常用いられる電極パターンとして6mm角の場合を考える。
電極パターンの面積Sは36mm2
この時の温度差ΔTは
ΔT=0.68x0.001/0.000036/1.0
=18.8℃
電極パターン6mm角は、通常の電極パターンの面積とほぼ同等である。そのため、この温度差18.8℃は、本発明を用いない場合の温度差と考えられる。
ΔT=0.68x0.001/0.000121/1.0
=5.6℃
この温度差5.6℃は、効果的に電極パターンと絶縁基板との関係による放熱を行っている状態と考えられる。したがって、平均温度差6℃以下であれば、放熱を最も効果的に行っていると考えられる。
また、通常の電極パターンの場合と放熱を意識した電極パターンの場合との切り分けは、両者の中間程度と考えられる。中間温度差ΔT1は18.8℃と5.6℃の中間とするとΔT1=12.2℃であり、約12℃である。
よって、式2で求まるΔTが12℃より大きければ、通常の電極パターンの範囲であり、12℃以下であれば放熱を意識した電極パターンと考えられる。
発熱源の電力Wが0.68W、絶縁基板63の厚さが1mm、絶縁基板63の熱伝導率ρが1W/(m・K)で、絶縁基板の一面と他面間の温度差を5℃以下とするための電極パターン面積Sは、式2を変形して、
S=W・L/ρ/ΔT (式3)
から算出できる。それぞれの値を入れると、
S=0.68・0.001/1/5
=136mm2(一辺11.6mmの正方形)
となり、電極パターンは一辺11.6mm以上の正方形であれば良い。
(1)基板が高熱伝導部材であること。
これは、基板の熱伝導率がきわめて低いと、電極パターンからの熱が基板に流れず、放熱がスムーズに行えなくなるからである。
(2)基板の裏面に放熱部材が張りつけてある。または、裏面がバックライトシャーシ等の放熱部に接触していること。
これは、基板の熱がスムーズに裏面から排出されないと、電極パターンの温度と基板裏面の温度の差が大きくなり推定値との差が大きくなるからである。
図12に示したLED基板1は、図4に示したLED基板1の配線パターン6を変更し、配線パターン36としたものである。この配線パターン36は隣接する電極パターン4,5と幅方向に同じ側、すなわち、上側と上側、下側と下側とを接続しているため、電極パターン4,5に載置するLEDチップ2は、隣接する者同士で正電極と負電極とが交互に配置されることになる。
図13に示したLED基板1は、長尺の短冊形状を有しエポキシ樹脂等からなる絶縁基板3の上に、LEDチップ2の電極を接続するための一対の矩形状の電極パターン34,35 及び、この一対の電極パターン34,35からそれぞれ引き出された配線パターン46を有している。そして、一対の電極パターン34,35と配線パターン46とはほぼ同じ厚みに形成されているが、一対の電極パターン34,35の方が配線パターン46よりも面積が大きくなるように形成されている。
図14に示したLED基板1は、一対の電極パターン44、45が半円状である点で図13に示したLED基板1とその構成が異なっているが、その他の構成は同じである。
LEDチップ2は一対の電極パターン44,45の略平行する対向部分Aに載置されるが、LEDチップ2からの熱は、LEDチップ2の電極部分を中心にして放射状に伝わるため、電極パターン44,45を円弧状とすることで、LEDチップ2付近の温度が高くなるのを防止している。
LEDチップ2の構成は、基本的に図5で示したLEDチップ2の構成と同じであるので詳細な説明は省略するが、本実施態様では、後述する理由から、P型層24に設けた正電極25’の面積を、N型層22に設けた負電極の面積よりも大きくしている。
この方法は、まず、それぞれ正電極25’と負電極26が密着するパターン電極14,15の箇所に、予め半田ペーストを印刷し、印刷した半田ペースト上にそれぞれ正電極25’と負電極26を位置決めした状態でLEDチップ2をLED基板1上に載置する。その後、リフロー炉の中で、LED基板1とLEDチップ2とを予熱(プリヒート)する。この予熱温度は一般的には150℃から170℃程度で行われる。次に、本加熱として半田が溶ける温度まで短時間高温にし、パターン電極4,5とLEDチップ2の各電極とを半田付けしている。本加熱は,半田の成分組成により溶融温度が異なるが、一般的には220℃から260℃で行われる。
一対の電極パターン14,15のうち、幅の広い電極パターン15に形成した凹部14aの長手方向両側にさらに切り欠き14bを形成している。このため、図18に示したLED基板1は、図16に示したLED基板1と比べ、LEDチップ2の正電極25’が載置される部分に突出部14cが形成されている点で異なる。これにより、リフロー時に電極パターン15の突出部15aと同様に、電極パターン14の突出部14cも、印刷した半田ペーストを早めに高温にすることができ、よりリフローの信頼性を増すことができる。
図19に示したLED基板1は、図18に示したLED基板1と比べ、一対の電極パターン14,15のうち、幅の狭い電極パターン15に形成した突出部15aを階段状に突出させ、段差15bを設けた点で異なる。また、段差15bと対向する電極パターン14側には凹み14dを設けている。
図20は、LEDパッケージ構造を有する半導体発光素子の断面を示す図である。
LEDパッケージ70は、LEDチップ71、蛍光体層72、保護層73、正電極74a,負電極74b、ビア75、接触パッド75a,75b、及び、シリコンサブマウント76で構成される。
Claims (17)
- 同一平面側に正電極及び負電極を有する半導体発光素子を搭載するための半導体発光素子搭載用基板であって、絶縁基板と、該絶縁基板上に前記正電極及び負電極がそれぞれ接続される一対の電極パターンと、該一対の電極パターンからそれぞれ引き出された配線パターンとを具備し、前記一対の電極パターンのそれぞれが前記配線パターンよりも広い面積を有することを特徴とする半導体発光素子搭載用基板。
- 前記一対の電極パターンは、略平行に所定の間隙を介して対向する対向部分を有し、該対向部分に前記半導体発光素子の正電極及び負電極が接続されることを特徴とする請求項1に記載の半導体発光素子搭載用基板。
- 前記絶縁基板が長尺の短冊形状を有し、前記一対の電極パターンは前記絶縁基板上に長手方向に延びかつ幅が異なり、前記半導体発光素子の正電極及び負電極が載置される前記一対の電極パターン部分には、少なくとも幅の狭い電極パターン及び幅の広い電極パターンのいずれか一方に、他方の電極パターン側へ突出する突出部が形成されていることを特徴とする請求項2に記載の半導体発光素子搭載用基板。
- 前記半導体発光素子の正電極及び負電極の内、活性層に遠い側の電極が前記幅の狭い電極パターンに接続されることを特徴とする請求項1から3のいずれか1に記載の半導体発光素子搭載用基板。
- 前記他方の電極パターン側に、前記突出部と所定の間隙を介して対向する凹部が形成されていることを特徴とする請求項3または4に記載の半導体発光素子搭載用基板。
- 前記突出部と前記凹部との間隙が、前記一対の電極パターンの幅方向の略中央に位置することを特徴とする請求項5に記載の半導体発光素子搭載用基板。
- 前記凹部の長手方向両側に切り欠きを形成したことを特徴とする請求項5または6に記載の半導体発光素子搭載用基板。
- 前記突出部が階段状になっていることを特徴とする請求項3から7のいずれか1に記載の半導体発光素子搭載用基板。
- 前記半導体発光素子は、正電極及び負電極が同一面側に形成され、かつ一方の電極の電極面積が他方の電極の電極面積よりも大きく形成され、電極面積の大きな電極が、前記幅の広い電極パターン側に接続されていることを特徴とする請求項3から8のいずれか1に記載の半導体発光素子搭載用基板。
- 前記半導体発光素子の電極面積の大きな電極は、電極面積の小さな電極よりも活性層に近いことを特徴とする請求項9に記載の半導体発光素子搭載用基板。
- 前記一対の電極パターンのそれぞれから引き出された配線パターンの引出し方向が相互に異なる方向となっていることを特徴とする請求項1または2に記載の半導体発光素子搭載用基板。
- 前記絶縁基板が長尺の短冊形状を有し、前記一対の電極パターンの間隙が前記短冊形状の長手方向に平行に形成されていることを特徴とする請求項1から3のいずれか1に記載の半導体発光素子搭載用基板。
- 前記絶縁基板が長尺の短冊形状を有し、該短冊形状の長手方向に沿って前記一対の電極パターンが複数形成され、前記半導体発光素子が複数個配列可能であることを特徴とする請求項1から12のいずれか1に記載の半導体発光素子搭載用基板。
- 前記半導体発光素子の電力をW(w)、前記一対の電極パターンの面積をS(m2)、前記絶縁基板の厚みをL(m)、前記絶縁基板の熱伝導率をρ(W/(m/K))とする場合、
ΔT=W・L/S/ρによって算出される前記絶基板の一面と他面間の平均温度差ΔTが12℃以下であることを特徴とする請求項1から13のいずれか1に記載の半導体発光素子搭載用基板。 - 請求項1から14のいずれか1に記載の半導体発光素子搭載用基板を備えたバックライトシャーシ。
- 請求項1から14のいずれか1に記載の半導体発光素子搭載用基板を備えた表示装置。
- 請求項16に記載の表示装置を備えるテレビ受信装置。
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Also Published As
Publication number | Publication date |
---|---|
EP2450973A1 (en) | 2012-05-09 |
CN102473828A (zh) | 2012-05-23 |
JP4686643B2 (ja) | 2011-05-25 |
RU2012103546A (ru) | 2013-08-10 |
US20120113328A1 (en) | 2012-05-10 |
MX2012000124A (es) | 2012-02-01 |
CN102473828B (zh) | 2014-11-12 |
JP2011029634A (ja) | 2011-02-10 |
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