WO2005104248A1 - 発光素子駆動用半導体チップ、発光装置及び照明装置 - Google Patents
発光素子駆動用半導体チップ、発光装置及び照明装置 Download PDFInfo
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- WO2005104248A1 WO2005104248A1 PCT/JP2005/007412 JP2005007412W WO2005104248A1 WO 2005104248 A1 WO2005104248 A1 WO 2005104248A1 JP 2005007412 W JP2005007412 W JP 2005007412W WO 2005104248 A1 WO2005104248 A1 WO 2005104248A1
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- light emitting
- emitting element
- driving
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- semiconductor chip
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Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/345—Current stabilisation; Maintaining constant current
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/38—Switched mode power supply [SMPS] using boost topology
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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
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/0554—External layer
- H01L2224/0555—Shape
- H01L2224/05552—Shape in top view
- H01L2224/05554—Shape in top view being square
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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
- H01L2224/42—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
- H01L2224/481—Disposition
- H01L2224/48151—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
- H01L2224/48221—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
- H01L2224/48245—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 metallic
- H01L2224/48247—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 metallic connecting the wire to a bond pad of the item
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
- H01L25/16—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
- H01L25/167—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits comprising optoelectronic devices, e.g. LED, photodiodes
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- 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
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1203—Rectifying Diode
- H01L2924/12032—Schottky diode
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1305—Bipolar Junction Transistor [BJT]
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- 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
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/13—Discrete devices, e.g. 3 terminal devices
- H01L2924/1304—Transistor
- H01L2924/1306—Field-effect transistor [FET]
- H01L2924/13091—Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
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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
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
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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
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/34—Voltage stabilisation; Maintaining constant voltage
Definitions
- the present invention relates to a semiconductor chip for driving a light emitting element, a light emitting device, and a lighting device.
- light emitting devices for driving light emitting elements such as visible light emitting diodes (visible light LEDs) and electronic devices such as mobile phones and digital cameras, and illumination devices using a plurality of the light emitting devices Opportunities are being used.
- light-emitting devices With the high integration of electronic devices, light-emitting devices with a small mounting area are required by the market. Since a light emitting element such as a visible light emitting diode is susceptible to electrostatic breakdown or breakdown, a protective element is required, and a driver IC for driving the light emitting element is needed.
- Patent Document 1 discloses a technique for reducing the mounting area of a light emitting device by mounting a light emitting element on a protective element and forming one light emitting module. .
- the light emitting device of the conventional example described in Patent Document 1 will be described with reference to FIGS. 12 to 14.
- FIG. 12 is a plan view showing the configuration of a conventional light emitting device.
- FIG. 13 is a cross-sectional view of dashed line AA ′ in FIG.
- FIG. 14 is a circuit diagram of the conventional light emitting device shown in FIG. 12 and FIG. The same reference numerals are used for the same components in FIGS.
- FIG. 12 and FIG. 13 will be described.
- a substrate wiring 1203 (including VCC wiring and GND wiring) is formed on a substrate 1202, and a light emitting module 1201, a power supply circuit 104 and a driver IC 1204 are mounted on the substrate wiring 1203.
- the elements of the internal circuit constituting the light emitting module 1201, the power supply circuit 104, and the driver IC 1204 are electrically connected to each other by a substrate wiring 1203.
- Power supply circuit 104 is connected to coil 141 by an input capacitor 143 connected between the VCC wiring and the GND wiring, a coil 141 connected to the input capacitor 143 via the VCC wiring, and a substrate wiring 1203.
- Schottky diode 142 and one end of the substrate wiring 1203 It has an output capacitor 144 connected to the Schottky diode 142 and the voltage feedback terminal 125 and the other end connected to the GND line.
- the lead frame 114 is mounted above the substrate 1202.
- the zener diode 1213 is fixed on the lead frame 114.
- the top surface of the Zener diode 1213 is covered with an insulating film 131 except for the node hole 113.
- Bumps 115 are mounted on pad holes 113 except for portions close to both ends on the Zener diode 1213, and a light emitting element 111 is mounted on the bumps 115.
- the light emitting element 111 is a visible light emitting diode (LED).
- the Zener diode 1213 protects the light emitting element 111 from electrostatic breakdown and high voltage breakdown.
- one light emitting element 111 is mounted on each of two Zener diodes 1213.
- the mounting area of the light emitting element 111 is mounted on the Zener diode 1213 as an integrated module, so that the mounting area is smaller than when the zener diode 1213 and the light emitting element 111 are separately mounted. It's smaller.
- each of two bonding wires 116 is connected to the pad hole 113 in a portion close to both ends on the Zener diode 1213.
- the other end of one bonding wire 116 is connected to the anode side terminal 1253, and the other end of the other bonding wire 116 is connected to the force sword side terminal 1254.
- a convex lens 119 is disposed on the top of the light emitting element 111.
- the convex lens 119 condenses the light of the light emitting element 111, strengthens the directivity of the light, and enhances the luminance in the direction perpendicular to the substrate 1202
- the light transmitting resin mold 117 covers the whole including the light emitting element 111, the zener diode 1213, the lead frame 114, and the convex lens 119, and is integrally formed with the substrate 1202.
- the upper half of the light transmitting resin mold 117 has a parabolic shape, and forms a reflecting surface that effectively reflects light and condenses it! / Scold.
- the lead frame 114 is mounted above the substrate 1202.
- the driver IC chip 112 is fixed on the lead frame 114.
- the upper surface of the driver IC chip 112 has the pad hole 113 removed. V, covered with insulating film 131
- One ends of six bonding wires 116 are respectively connected to the six pad holes, and the other ends of the bonding wires 116 are external connection terminals (control terminal 123, voltage feedback terminal 125, switching terminal 124, It is connected to the current feedback terminal 126, the VCC terminal 121, and the GND terminal 122).
- driver IC chip 112 is electrically connected to the external connection terminal through the plurality of bonding wires 116! Scold.
- the VCC terminal 121 is connected to a VCC wiring.
- the GND terminal 122 is connected to the GND wiring.
- the control terminal 123 is a terminal to which a signal for switching ONZOFF of the driver IC 1204 is input.
- the driver IC chip 112 operates and the light emitting element 111 emits light continuously.
- the driver IC chip 112 stops its operation and the light emission of the light emitting element 111 also stops. By inputting a pulse voltage to the control terminal 123, the blinking operation of the light emitting element 111 can be repeated.
- Switching terminal 124 is connected to the anode terminal of Schottky diode 142 and coil 141 by substrate wiring 1203.
- the voltage feedback terminal 125 is connected to the power source terminal of the Schottky diode 142, the anode terminal 1253 of the light emitting module 1201, and the output capacitor 144 by the substrate wiring 1203.
- the current feedback terminal 126 is connected to the force sword side terminal 1254 of the light emitting module 1201 by the substrate wiring 1203!
- the light emitting device of the prior art includes a power supply circuit 104 for boosting the voltage output from the external power supply 140 and a power supply via an external connection terminal (VCC terminal 121, switching terminal 124, voltage feedback terminal 125). It has a driver IC 1204 connected to the circuit 104, and a light emitting module 1201 connected to the power supply circuit 104 through the anode side terminal 1253 and connected to the driver IC 1204 through the force sort side terminal 1254.
- the circuit shown in the frame of driver IC 1204 in FIG. 14 is an internal circuit mounted on driver IC chip 112.
- the driver IC chip 112 is connected between the first protection circuit 501 connected between the voltage feedback terminal 125 and the GND terminal 122, between the VCC terminal 121 and the GND terminal 122, and the current return to the intermediate connection point Second protection circuit 1401 with the terminal 126 connected , Current detection resistor 504 connected between current feedback terminal 126 and ground potential, voltage detection circuit 503 connected to control terminal 123, voltage feedback terminal 125, and current feedback terminal 126, and control terminal 123 with voltage detection
- a drive circuit 502 is connected to the circuit 503 and the switching terminal 124.
- First protection circuit 501 prevents electrostatic breakdown of voltage detection circuit 503 by application of a surge to voltage feedback terminal 125, and is formed of a Zener diode, a MOS transistor, or a neupolar transistor or the like. Be done.
- the first protection circuit 501 of FIG. 14 is a Zener diode.
- Second protection circuit 1401 prevents electrostatic breakdown of the internal circuit of driver IC chip 112 due to the application of a surge to current feedback terminal 126.
- the second protection circuit 1401 is formed of a series connection circuit of two diodes.
- Drive circuit 502 drives coil 141 and Schottky diode 142 via switching terminal 124 to boost the input voltage from external power supply 140. From this point of view, a voltage higher than the input voltage is applied to the output capacitor 144 as the output voltage. The voltage of the output capacitor 144 is applied to the anode side of the light emitting element 111 through the anode side terminal 1253 of the light emitting module 1201.
- the Zener diode 1213 and the light emitting element 111 are connected in parallel in a pair.
- the Zener diode 1213 also protects the light emitting element 111 from the surge force applied to the anode side terminal 1253 or the force sort side terminal 1254 when the light emitting module 1201 is mounted or the like.
- the force-sword side terminal 1254 of the light emitting module 1201 is connected to a current feedback terminal 126 connected to the current detection resistor 504 in the driver IC chip 112.
- the voltage detection circuit 503 keeps the current flowing to the light emitting element 111 constant by keeping the terminal voltage of the current detection resistor 504 constant.
- the voltage detection circuit 503 detects and controls the output voltage so that the voltage at the voltage feedback terminal 125 does not exceed the specified value.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2003-8075
- the light emitting module 1201 including the light emitting element 111 and the dry IC 1204 including the dry IC chip 112 are mounted on separate lead frames. There is a problem that the mounting area becomes large. In particular, when a plurality of light emitting elements 111 are used, the space occupied by the Zener diode 1213 is large, which causes a problem. In the light emitting device of the conventional example, since the protection element 1213 for protecting the electrostatic breakdown and breakdown of the light emitting element 111 and the driver IC 112 for driving the light emitting element 111 are necessary, they are removed to reduce the mounting area. I can not do it.
- the present invention solves the above problems, and an object of the present invention is to provide a light emitting device with a small mounting area.
- An object of the present invention is to provide an inexpensive semiconductor chip for driving a light emitting element that can be used in combination with any number of light emitting elements.
- An object of the present invention is to provide an inexpensive lighting device.
- An object of the present invention is to provide a high-intensity and compact lighting device.
- the present invention has the following configuration.
- a light emitting device includes an electric signal terminal, and a light emitting element driven to emit light by an electric signal externally supplied to the electric signal terminal, and outputs the electric signal to the electric signal terminal.
- a light emitting element driving semiconductor chip on which a light emitting element driving circuit to be applied is formed using a semiconductor, and the light emitting element is mounted on the surface of the light emitting element driving semiconductor chip.
- a light emitting device with a small mounting area can be realized by mounting a light emitting element on a semiconductor chip for driving a light emitting element (driver IC chip).
- the semiconductor chip for driving a light emitting element may be an electrostatic air or a high voltage (hereinafter referred to as “the light emitting element or the light emitting element driving circuit applied from outside).
- the light emitting element or the light emitting element driving circuit applied from outside Protective circuits that protect static electricity and high voltage from “surge voltage.”
- a protection terminal for electrically connecting the protection circuit to the outside, and the protection terminal is connected to the electrical signal terminal of the light emitting element.
- the protection circuit of the light emitting element is provided on the driver IC chip, or the protection of the internal circuit of the driver IC chip and the light emitting element
- a protection circuit which also serves as protection a highly reliable light emitting device can be realized at low cost.
- the cost is reduced compared to the prior art. Can realize a light-emitting device with a small mounting area.
- the protection circuit is formed by the same method as an element forming the light emitting element driving circuit of the light emitting element driving semiconductor chip. Alternatively, a plurality of elements are provided.
- the protection circuit is formed using at least one of a PN junction diode, a neupolar transistor, and a MOS transistor. According to the present invention, a light emitting device can be realized at low cost with high reliability and small mounting area.
- a plurality of the light emitting elements constituted by separate chips are mounted on the surface of the light emitting element driving semiconductor chip,
- the semiconductor chip for driving a light emitting element is provided with a conductive path connecting the light emitting elements to each other.
- the conductive path may be a conductor having a very low resistance value or a path that produces a predetermined resistance value or a predetermined voltage drop that is acceptable. In general, it is often preferred that the conductive path be formed of a conductor of very low resistance.
- the conductive path may be formed on the semiconductor substrate itself of the driver IC chip as a diffusion layer or may be formed on the semiconductor substrate by any method such as vapor deposition, adhesion or coating.
- the material of the conductive path is arbitrary. For example, a diffusion layer, a metal wiring layer, a resin conductive layer and the like formed on a driver IC chip.
- the conductive path is
- the light emitting element driving semiconductor chip is formed by a diffusion layer or metal wiring layer formed by the same processing method as the diffusion layer or metal wiring layer forming the light emitting element driving circuit.
- the conductive path includes a resistor having a predetermined value.
- the temperature in the vicinity of the light emitting element is detected based on, for example, a change in the resistance value of the conductive path, or the current flowing through the light emitting element is detected based on the voltage across the conductive path.
- the current flowing in each light emitting element can be made uniform by connecting in series the conductive path having the resistance value to each light emitting element.
- the above-described light emitting device includes a plurality of visible light emitting elements that emit light at different wavelengths.
- a plurality of light emitting elements different in emission color can be arranged at a very close position, for example, when a plurality of light emitting elements are lighted simultaneously, the plurality of light emitting elements mix well and which angle Even if it sees from the side, it is hard to produce color unevenness.
- the light emitting element includes a plurality of visible light emitting elements that respectively emit light in three primary colors of red, green and blue.
- the light emitting device of the present invention can perform color display. Since a single light emitting device has a driver IC chip, peripheral circuits can be reduced and it is easy to connect a plurality of light emitting devices. Since the light emitting area occupies a large proportion of the total area of each light emitting device in which the mounting area of the light emitting device is small, when a plurality of light emitting devices are closely arranged, a display of a light emitting device having a much higher luminance than before. (Lighting device) can be realized. For example, it is useful as an outdoor image display device.
- a plurality of the light emitting elements are disposed in the vicinity of the focal point of one transmission type condensing lens integrally formed on the light emitting device.
- the light emitting element By arranging the light emitting element at the focal point of the condensing optical system, the light emitted from the light emitting element can be You can concentrate on a fixed direction.
- the light emitting elements In a conventional light emitting device in which a plurality of light emitting elements are disposed on a circuit board due to the restriction on the accuracy of attaching the light emitting elements to the circuit board, the light emitting elements must be disposed at a certain distance. . Therefore, a plurality of light emitting elements were attached to the focusing power of the condensing optical system at a distance.
- a plurality of light emitting elements are arranged at positions slightly shifted from the focal power of the parabola below a large parabolic reflecting surface, and individual resin convex lenses are placed directly above each light emitting element at the bottom of the nobola.
- a part of the light emitted from the light emitting element does not go in a predetermined direction, and the light collection rate can not be increased more than a certain level.
- the plurality of light emitting elements are disposed in the vicinity of the focal point of one reflecting surface integrally formed on the light emitting device.
- the reflective surface is typically a reflective surface of a transparent resin formed so that light is totally reflected on the inner surface. According to the present invention, it is possible to realize a light emitting device having a high light collection rate and strong directivity.
- a lighting device is a semiconductor for driving a light emitting element, which has a constant current circuit for applying a predetermined current to the light emitting element or a constant voltage circuit for applying a predetermined voltage to the light emitting element.
- a plurality of the above-described light emitting devices provided with a chip are included.
- the lighting device includes, for example, a normal lighting device, a large display panel, a video display device, and the like.
- a semiconductor chip for driving a light emitting element includes a plurality of light emitting elements including an electric signal terminal and driven to emit light by an electric signal supplied to the electric signal terminal.
- a light emitting element driving circuit which is a driving semiconductor chip, is formed using a semiconductor, outputs the electric signal and applies the electric signal to the electric signal terminal, and the electric signal terminals of the plurality of light emitting elements are mutually set. And a conductive path to be connected.
- a plurality of light emitting element driving semiconductor chips By providing a conductive path only for interconnection of light emitting elements, a semiconductor chip for driving a light emitting element can be realized at low cost and with a small mounting area.
- the number P (P is a positive integer greater than or equal to 1) of the light-emitting elements formed of separate chips, and the light-emitting elements
- the circuit elements of the driving semiconductor circuit are mutually connected via the bumps provided on the conductive path.
- the number of conductive paths is the same as the number of light emitting devices in place of the number P of light emitting devices. And a different positive integer) light emitting element is mounted.
- a plurality of light emitting devices having different numbers of light emitting elements can be manufactured by changing the mounting location of the light emitting elements with one type of conductive path pattern (for example, an aluminum wiring pattern).
- one type of conductive path pattern for example, an aluminum wiring pattern.
- only one type of mask can be used to form the conductive path pattern.
- it is possible to manufacture a light emitting device according to demand by combining one kind of driver IC chip and an arbitrary light emitting element it is possible to reduce the storage of the driver IC chip as a material of LED. According to this invention, the management cost of the factory can be reduced.
- the above semiconductor chip for driving a light emitting device has an external connection terminal for changing a current or a voltage value for driving the light emitting device.
- the setting of the driver IC chip may be changed between when the driver IC chip drives one light emitting element and when driving the four light emitting elements. Since the semiconductor chip for driving a light emitting element of the present invention can change the current flowing from the external connection terminal to the light emitting element or the voltage applied to the light emitting element, many kinds of light emitting devices are manufactured using one driver IC chip. it can.
- the light emitting device when the light emitting device can be realized with a small mounting area, advantageous effects can be obtained.
- the present invention it is possible to obtain an advantageous effect of being able to realize an inexpensive and highly reliable light emitting device by eliminating a protective element such as a Zener diode which has been conventionally required. According to the present invention, it is possible to obtain an advantageous effect if it is possible to realize a light emitting device which can increase the withstand voltage of the electrostatic breakdown of the external connection terminal of the light emitting module.
- the light emitting device of the present invention since the light emitting element is mounted on the driver IC chip, the parasitic resistance and floating capacitance of the substrate wiring are reduced as compared with the conventional case. Therefore, it becomes easy to design the phase compensation for stabilizing the current value, and an advantageous effect of stabilizing the luminance of the light emission and eliminating the flicker of the light emission can be obtained.
- the advantageous effect of being able to realize an inexpensive lighting device is obtained. According to the present invention, it is possible to obtain an advantageous effect of being able to realize a high-intensity and compact lighting device.
- FIG. 1 is a plan view showing a configuration of a light emitting device according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view taken along a broken line A-A 'in FIG.
- FIG. 3 is a partially enlarged cross-sectional view of a driver IC chip according to Embodiment 1 of the present invention.
- FIG. 4 is a plan view showing the shape of aluminum wiring that connects between the light emitting element of the light emitting device of the first embodiment of the present invention and the driver IC chip.
- FIG. 5 is a circuit diagram of a light emitting device according to a first embodiment of the present invention.
- FIG. 6 is a circuit diagram of a light emitting device according to a second embodiment of the present invention.
- FIG. 7 is a circuit diagram of a protection circuit of a third embodiment of the present invention.
- FIG. 8 is a circuit diagram of a protection circuit according to a fourth embodiment of the present invention.
- FIG. 9 is a circuit diagram of a protection circuit of a fifth embodiment of the present invention.
- FIG. 10 is a partially enlarged sectional view of a driver IC chip according to a sixth embodiment of the present invention.
- FIG. 11 is a partially enlarged cross-sectional view of a driver IC chip according to a seventh embodiment of the present invention.
- FIG. 12 is a plan view showing the configuration of a conventional light emitting device.
- FIG. 13 is a cross-sectional view of dashed line A-A 'in FIG.
- FIG. 14 is a circuit diagram of a conventional light emitting device.
- FIG. 15 is a plan view showing the shape of aluminum wiring that connects between the light emitting element of the light emitting device of the eighth embodiment of the present invention and the driver IC chip.
- FIG. 1 is a plan view of a light emitting device according to Embodiment 1 of the present invention.
- FIG. 2 is a cross-sectional view taken along a broken line A-A 'in FIG.
- FIG. 3 is a partially enlarged cross-sectional view of the driver IC chip 112.
- FIG. 4 is a plan view showing the shape of aluminum wiring connecting between the light emitting elements 11 la and 11 lb which are LEDs and the driver IC chip 112.
- FIG. 5 is a circuit diagram of the light emitting device according to the first embodiment of the present invention.
- the same reference numerals are used for the same components in FIGS. In FIGS. 1 to 5, the same reference numerals are used for the same components as in FIGS. 12 to 14 of the conventional example.
- the substrate wiring 103 (including the VCC wiring and the GND wiring) is formed on the substrate 102, and the power supply circuit 104 and the light emitting module 101 are mounted on the substrate wiring 103. .
- Each element of the internal circuit of the light emitting module 101 and each element of the internal circuit of the power supply circuit 104 are electrically connected by the substrate wiring 103.
- the VCC wiring is connected to the external power supply, and the GND wiring is connected to the ground potential.
- the power supply circuit 104 is connected to the coil 141 by the input capacitor 143 connected between the VCC wiring and the GND wiring, the coil 141 connected to the input capacitor 143 via the VCC wiring, and the substrate wiring 103. And an output capacitor 144 having one end connected to the Schottky diode 142 via the substrate wiring 103 and the other end connected to the GND wiring.
- the light emitting module 101 has external connection terminals (VCC terminal 121, GND terminal 122, control terminal 123, switching terminal 124, voltage feedback terminal 125) connected to the power supply circuit 104 by the substrate wiring 103.
- the VCC terminal 121 is connected to the VCC wiring.
- the GND terminal 122 is connected to the GND wiring.
- the control terminal 123 is usually connected to the output of a control circuit such as a microcomputer, and receives a signal for switching the light emission Z stop of the light emitting elements l 1 la and 11 lb.
- Switching terminal 124 is connected to the anode terminal of Schottky diode 142 and coil 141 by substrate wiring 103.
- the voltage feedback terminal 125 is connected to the power source terminal of the system key diode 142 and the output capacitor 144 by the substrate wiring 103.
- the lead frame 114 is mounted above the substrate 102, and the driver IC chip (semiconductor chip for driving light emitting element) 112 is fixed on the lead frame 114.
- the top surface of the driver IC chip 112 is covered with an insulating film 131 except for the nod hole 113.
- the pad hole 113 is a portion on the driver IC chip 112 where the insulating film 131 does not exist.
- the bump 115 is provided in the pad hole 113 except near the both ends, and the light emitting element l l la, 11 lb is mounted on the bump 115.
- the light emitting device of the present invention differs from the light emitting device of the conventional example in that the driver IC chip 112 is built in the light emitting module 101, and the light emitting elements 111 a and 111 b are mounted on the driver IC chip 112. It is being implemented. Therefore, the size of the substrate 102 of the present invention is smaller than that of the substrate 1202 of the conventional example. In the light emitting device of the present invention, since the light emitting elements l la and 111 b are mounted on the driver IC chip 112, the mounting area of the light emitting device can be reduced as compared with the prior art.
- the light emitting elements ll la and 11 lb (both are collectively referred to as light emitting element 111) Composed of individual chips.
- a plurality of light emitting elements are mounted on the driver IC chip 112.
- two light emitting elements, llla and 11 lb, are implemented.
- Light-emitting elements 11 la and 11 lb are visible light-emitting diodes (LEDs).
- the color of the light emitting element can be used as desired.
- the light emitting elements 11 la and 111 b are blue light emitting diodes and emit white light to the outside through the transmission type condensing lens 119 coated with a white fluorescent substance on the surface.
- the plurality of light emitting elements may emit light at different wavelengths.
- the convex lens 119 disposed on the top of the light emitting element 111 condenses the light of the light emitting element 111 to strengthen the directivity of the light and to increase the luminance in the direction perpendicular to the substrate 102.
- the light transmitting resin mold 117 covers, fixes and protects the whole including the light emitting element 111, the driver IC chip 112, the lead frame 114, and the convex lens 119.
- the light transmitting resin mold 117 plays a role of condensing the light of the light emitting element 111 and adjusting the brightness and the directivity of the light.
- the upper half of the light transmitting resin mold 117 has a parabolic shape, and forms a reflecting surface that effectively totally reflects light and condenses it to enhance the brightness in the direction perpendicular to the substrate 102.
- light transmitting resin mold 117 and convex lens 119 are integrally formed of the same material.
- a plurality of light emitting elements 11 la and 11 lb are disposed in the vicinity of the focal point of a transmission type condensing lens 119 and one reflecting surface 117 in which a white fluorescent substance is coated on one surface formed integrally with the light emitting device. Be done.
- FIG. 3 is an enlarged view of a part of the top surface of the driver IC chip 112.
- An upper surface of a P-type silicon substrate 132 which is a substrate of the driver IC chip 112 is covered with an insulating film 133a.
- the upper surface of the insulating film 133a is covered with the insulating film 133b except for the portions of the aluminum interconnections 118a, 118b and 118c which are conductive paths.
- insulating films 133 a and 133 b are oxide films (SiO 2).
- the material of the insulating films 133a and 133b is not limited to the oxide film (SiO 2), and may be a nitride film (SiN),
- It may be a polymer compound (polyimide etc.), resin (epoxy etc.) etc.
- the upper surfaces of the insulating film 133 b and the anode line 118 a, 118 b, and 118 c are covered with an insulating film 131 except for the nod 113.
- the pad hole 113 connects the bonding wire 116 In order to put a bump 115 on it.
- Bumps 115 are provided at predetermined positions of pad holes 113 on aluminum interconnections 118a, 118b and 118c.
- the light emitting element l l la, 11 lb is mounted on the bump 115.
- the light emitting element l lla, 111b is connected to the light emitting element 118a, 118b, 118c on the Lino IG chip 112 through the namp 115.
- Bonding wires 116 are connected to the pad holes 113 shown in the portions near the both ends of FIG. 3 as shown in FIGS.
- the driver IC chip 112 electrically connects the internal circuit to the external connection terminals (VCC terminal 121, GND terminal 122, control terminal 123, switching terminal 124, voltage feedback terminal 125) by bonding wires 116.
- the (electrical signal terminal) is connected to the internal circuit element of the driver IC chip 112 and the voltage feedback terminal (protective terminal) 125 via the bump 115 and the aluminum wiring 118 c.
- the force sword of the light emitting element 111b is connected to the anode of the light emitting element 11 la via the bump 115 and the aluminum wiring 188b.
- the force sword of the light emitting element 11 la is connected to an internal circuit element (such as a resistance element 504 for current feedback) of the driver IC chip 112 through the bump 115 and the aluminum wiring 118a.
- Light Emitting Device l l la, 11 lb Anode and Force Sword are electrical signal terminals.
- Aluminum wiring 118 b only has a role of connecting the force sword of 11 lb of light emitting element to the anode of light emitting element 11 la and is not connected to the circuit element formed on driver IC chip 112
- the driver IC chip 112 and the plurality of light emitting elements ll la are formed by a conductive path formed of a metal wiring layer or a diffusion layer or the like. , 11 lbs may be connected to each other.
- the metal wiring layer is formed of, for example, aluminum, gold or copper.
- the light emitting device includes a power supply circuit 104 for boosting the voltage output from the external power supply 140, an external connection terminal (VCC terminal 121, switching terminal 124, voltage feedback terminal And the light emitting module 101 connected to the power supply circuit 104 via 125).
- one end of input capacitor 143 is connected to external power supply 140. There is. The other end of the input capacitor 143 is connected to the ground potential.
- the coil 141 is connected to the input power source 140 and the anode terminal of the Schottky diode 142.
- the force-sword terminal of the Schottky diode 142 is connected to one end of the output capacitor 144.
- the other end of the output capacitor is connected to the ground potential.
- the first protection circuit 501, the drive circuit 502, the voltage detection circuit 503, and the current detection resistor 504 described in the frame of the light emitting module 101 shown in FIG. 5 are mounted on the driver IC chip 112. It is a circuit for driving a light emitting element.
- the driver IC chip 112 is driven by being supplied with power from a VCC terminal 121 connected between the input capacitor 143 and the coil 141.
- the voltage feedback terminal 125 is connected between the force-sword terminal of the Schottky diode 142 and the output capacitor 144 to input an output voltage.
- the GND terminal 122 is connected to the ground potential.
- a first protection circuit 501 and a first voltage dividing resistor 521 and a second voltage dividing resistor 522 of the voltage detection circuit 503 are connected in parallel.
- the first protection circuit 501 is a Zener diode.
- the first protection circuit 501 prevents electrostatic breakdown of the voltage detection circuit 503 by applying a surge voltage to the voltage feedback terminal 125.
- the voltage feedback terminal 125 is further connected to an anode of a light emitting element 11 lb.
- a light source of 11 lbs. Is connected to the anode of 11 lass.
- the light source of the light emitting element 11 la is connected to the ground potential via the current detection resistor 504.
- the anode side of the light emitting element 11 lb is electrically exposed to the outside through the voltage feedback terminal 125.
- the surge voltage applied to the anode of the light emitting element 11 lb through the voltage feedback terminal 125 is absorbed by the first protection circuit 501.
- the light emitting elements 11 la and 11 lb are prevented from electrostatic breakdown.
- the first protection circuit 501 is originally a circuit for protecting the inside of the driver IC chip 112, but is connected to the light emitting element 11 lb in the light emitting module 101, so the light emitting elements 1 11 a and 11 b are provided. It also functions as a protection circuit for lb. Therefore, the light emitting device of the present invention can omit the Zener diode 1213 of FIG. 14 which is required in the light emitting device of the conventional example.
- the force sort side of the light emitting element 11 la is connected to the current detection resistor 504 in the light emitting module 101, and therefore, the application of the surge voltage of the external force is not performed. Therefore, the light emitting device of the present invention does not require the second protective circuit 1401 (FIG. 14) which is required in the light emitting device of the conventional example.
- the present invention can reduce the area of the driver IC chip 112 as compared to the conventional light emitting device.
- connection point between the light emitting element 11 la and the current detection resistor 504 is connected to the inverting input terminal of the error amplifier 526.
- One end of a first reference voltage 525 is connected to the non-inverting input terminal of the error amplifier 526.
- the other end of the first reference voltage 525 is connected to the ground potential.
- the output terminal of the error amplifier 525 is connected to the non-inverting input terminal of the PWM comparator 528, and also connected to the non-inverting input terminal of the error amplifier 525 via a capacitor and a resistor.
- the inverting input terminal of the PWM comparator 528 is connected to the other end of the sawtooth oscillator 527 whose one end is connected to the control terminal 123.
- the output terminal of the PWM comparator 528 is connected to the input terminal of the AND circuit 511 in the drive circuit 502.
- the first reference voltage is input to the non-inversion input terminal of error amplifier 526 by connecting the elements inside voltage detection circuit 503 to each other, and the voltage between the terminals of current detection resistor 504 being input to error amplifier 526.
- the negative feedback operation is performed to be equal to 525.
- the output terminal of the comparator 524 is further connected to the input terminal of the AND circuit 511 in the drive circuit 502.
- the inverting input terminal of the comparator 524 is connected to the connection point of the first voltage dividing circuit 521 and the second voltage dividing circuit 522.
- One end of a second reference voltage 523 is connected to the non-inverted input terminal of the comparator 524.
- the other end of the second reference voltage 523 is connected to the ground potential.
- the first voltage dividing resistor 521, the second voltage dividing resistor 522, the second reference voltage 523 and the comparator 524 connected as described above are the output voltage of the output capacitor 144 (voltage feedback terminal 1 This protection circuit is used to detect and control the output voltage so that the 25) voltage does not exceed the specified value.
- the output terminal of AND circuit 511 is connected to the gate of N channel MOS transistor 512 via an amplifier.
- the source of the N channel MOS transistor 512 is connected to the ground potential, and the drain is connected to the switching terminal 124.
- Drive circuit 502 controls the on / off switching operation of N-channel MOS transistor 512 by the output of AND circuit 511. By this switching operation, the input voltage output from the external power supply 140 is boosted, and a voltage higher than the input voltage is applied to the output capacitor 144.
- the control terminal 123 is connected to the input terminal of the AND circuit 511.
- the driver IC chip 112 operates and the drive circuit 502 causes the light emitting element 111 to emit light continuously.
- the driver IC chip 112 stops its operation, and the drive circuit 502 stops the light emission of the light emitting element 111.
- the driving circuit 502 switches the ON / OFF of the light emitting element 111 based on the input voltage input to the control terminal 123. By inputting a pulse voltage to the control terminal 123, the blinking operation of the light emitting element 111 can also be repeated.
- the operation of supplying constant current to the light emitting elements 11 la and 11 lb will be described.
- the terminal voltage of the current detection resistor 504 increases.
- the error amplifier 526 of the voltage detection circuit 503 is The output signal goes low.
- the output signal of error amplifier 526 is input to the non-inverting input terminal, and the output signal of oscillator 527 is input to the inverting input terminal.
- the output signal of PWM comparator 528 becomes lower as the output signal of error amplifier 526 becomes lower. The low period becomes longer and the high period becomes shorter. While the output signal of the PWM comparator 528 is high, the N-channel MOS transistor 512 is turned on. Since the on time is shortened, the amount of current accumulated from the external power supply 140 in the coil 141 is reduced.
- the voltage detection circuit 503 controls the switching operation of the N-channel MOS transistor 512 of the drive circuit 502 so that the terminal voltage of the current detection resistor 504 becomes equal to the first reference voltage 525. Thus, a constant current flows in the light emitting element 111.
- the light emitting module 101 is provided with the current feedback terminal 126 as an external connection terminal.
- the current feedback terminal 126 is provided in the driver IC 1204 and is connected to the force-sword side terminal 1254 of the conventional light emitting module 1201.
- the conventional current feedback terminal 126 is not necessary.
- the driver IC chip 112 is a constant current circuit, and is configured to boost the input voltage and supply a predetermined current to the light emitting elements l l la and 11 lb.
- the driver IC chip 112 may be a constant voltage circuit configured to boost the input voltage and apply a predetermined voltage to the light emitting elements 11 la and 11 lb.
- driver IC chip 112 includes a constant voltage circuit for boosting an input voltage to a constant voltage, and a constant current circuit for flowing a predetermined current to each of a plurality of light emitting elements connected in parallel. May be included.
- the driver IC chip 112 is a constant current circuit that steps down the input voltage and supplies a predetermined current to the light emitting element 11 la, or a constant voltage circuit that applies a predetermined voltage to the light emitting element 11 la, 11 lb. It may be.
- the light emitting device of the present invention has the configuration in which the light emitting element 111 is mounted on the driver IC chip 112, the mounting area can be greatly reduced as compared with the light emitting device of the conventional example.
- FIG. 6 is a circuit diagram showing a light emitting device according to a second embodiment.
- the light emitting device of the sixth embodiment differs from the light emitting device of the first embodiment in that four light emitting elements l l l (l l la, l l lb, l l lc, 11 Id) are connected in series.
- the other configuration is the same as that of the first embodiment. Therefore, duplicate explanations are omitted.
- the configuration of the main part is the same, and so the same effect as the first embodiment is obtained.
- the number and connection of the light emitting elements 111 are not limited to those in Embodiment 1 and Embodiment 2. It is possible to connect an arbitrary desired number of light emitting elements, or to connect a plurality of light emitting elements and a series of light emitting elements. An embodiment in which resistors are connected in parallel is also included in the present invention. Of course, one light emitting element may be used.
- the first and second embodiments it is possible to dispose a plurality of convex lenses in accordance with the number of light emitting elements, which is one of the convex lenses 119 disposed above the light emitting elements 111.
- one light emitting element may be combined with one convex lens.
- FIG. 7 is a circuit diagram showing a configuration of a protective circuit of a light emitting device of a third embodiment.
- the first protection circuit 501 of the third embodiment is a circuit in which a tunnel diode 711 and a diode 712 are connected in parallel.
- the diode 712 mainly uses a PN junction.
- the zener diode 711 and the force sword of the diode 712 are connected to the voltage feedback terminal 125 of FIG. 5 of the first embodiment.
- the anodes of the Zener diode 711 and the diode 712 are connected to the GND terminal 122 of FIG.
- the first protection circuit 501 may be only the diode 712.
- the configuration of the third embodiment is the same as that of the first embodiment except for the configuration of the first protection circuit 501. Therefore, duplicate explanations are omitted. Since the configuration of the main part is the same in this third embodiment as well, the same effect as the first embodiment is obtained. Also in the present embodiment, the actual As in Embodiments 1 and 2, the combination of the number of light emitting elements and the number of convex lenses is arbitrary.
- FIG. 8 is a circuit diagram showing a configuration of a protective circuit of a light emitting device of a fourth embodiment.
- the first protection circuit 501 of the fourth embodiment has a configuration in which a resistor 812 is connected between the base emitters of an NPN bipolar transistor 811.
- the emitter of the NPN bipolar transistor 811 is connected to the GND terminal 122 of FIG. 5 of the first embodiment.
- the collector of the NPN bipolar transistor 811 is connected to the voltage feedback terminal 125 of FIG. 5 of the first embodiment.
- the first protection circuit 501 of the fourth embodiment can adjust the withstand voltage by changing the resistance value of the resistor 812. In general, a protection circuit using the neupolar transistor 811 can be realized in a smaller area than a protection circuit using a diode.
- the configuration of the fourth embodiment other than the first protection circuit 501 is the same as that of the first embodiment. Therefore, duplicate explanations are omitted. Since the configuration of the main part is the same also in this fourth embodiment, it has the same effect as the first embodiment. Also in this embodiment, as in Embodiments 1 and 2, the combination of the number of light emitting elements and the number of convex lenses is arbitrary.
- FIG. 9 is a circuit diagram showing a configuration of a protective circuit of a light emitting device of a fifth embodiment.
- the first protection circuit 501 of the fifth embodiment uses an N-channel MOS transistor 911.
- the gate, back gate, and source terminals of the N-channel MOS transistor 911 are connected in common and connected to the GND terminal 122 of FIG. 5 of the first embodiment.
- the drain of the N-channel MOS transistor 911 is connected to the voltage feedback terminal 125 of FIG. 5 of the first embodiment.
- the protection circuit 501 using the N-channel type MOS transistor 911 can be realized in a smaller area than a protection circuit using a diode.
- the configuration other than the first protection circuit 501 is the same as that of the first embodiment. . Therefore, duplicate explanations are omitted.
- the configuration of the main part of the fifth embodiment is the same as that of the fifth embodiment, and therefore, the same effect as that of the first embodiment is obtained. Also in this embodiment, as in Embodiments 1 and 2, the combination of the number of light emitting elements and the number of convex lenses is arbitrary.
- FIG. 10 is a partial enlarged cross-sectional view of the driver IC chip 112 of the sixth embodiment.
- the same components as in FIG. 3 of the first embodiment are assigned the same reference numerals.
- the light emitting device of the sixth embodiment differs from the light emitting device of the first embodiment in the connection between the light emitting element 11 la and the light emitting element 11 lb.
- a P type diffusion resistor 1002 is disposed on the top of a P type silicon substrate 132 which is a substrate of the driver IC chip 112, and an N type wafer is provided around the P type diffusion resistor 1002. Covered with 1001.
- the upper surface of the P-type silicon substrate 132 is covered with aluminum wires 1018 a and 1018 a, and an insulating film 133 a.
- the top is covered with an insulating film 133 b and aluminum wires 118 a, 1018 b, 1018 b ⁇ 118 c.
- the insulating film 133 b and the anode line 118 a, 1018 b, 1018 b ⁇ 118 c are covered with the insulating film 131 except for the nod 113.
- Insulating film 131 of the sixth embodiment is polyimide.
- Bumps 115 are placed at predetermined positions of the nod holes 113, and light emitting elements 11 la and 11 lb are mounted thereon.
- the light emitting element 11 la is electrically connected to the light emitting element 11 lb through the bump 115, the aluminum wiring 1018b, the aluminum wiring 1018a, the P type diffusion resistance 1002, the aluminum wiring 1018a, and the aluminum wiring 1018b.
- the other configuration of the light emitting device of the sixth embodiment is the same as that of the first embodiment. Therefore, duplicate explanations are omitted. Since the configuration of the main part is the same also in the sixth embodiment, the same effect as the light emitting device of the first embodiment is obtained.
- the number of convex lenses may be two according to the number of light emitting elements 11 la and 11 lb!
- FIG. 11 is a partial enlarged cross-sectional view of driver IC chip 112.
- the same components as in FIG. 3 of Embodiment 1 and FIG. 10 of Embodiment 6 are assigned the same reference numerals.
- the difference between the light emitting device of the third embodiment and the first and sixth embodiments is that the plurality of light emitting elements 111 are mutually connected. It is
- a P type diffusion resistor 1002 is disposed on the top of a P type silicon substrate 132 of a driver IC chip 112, and the periphery of the P type diffusion resistor 1002 is covered with an N type wafer 1001.
- the upper surface of the P-type silicon substrate 132 has four layers of insulating films (from the bottom, 133a, 133b, 133c, and 133d) and four layers of anode lines (1118a and 1118a, 1118b and 1118b, 1118c and 1118c '). , Covered with 118a, 1118d and 1118d,)!
- An insulating film 131 is further formed on the upper insulating film 133 d and the aluminum wirings 118 a, 1118 d and 1118 d except for the pad holes 113.
- Insulating film 131 of the seventh embodiment is polyimide.
- a bump 115 is provided at a predetermined position of the pad hole 113, and the light emitting element 1 l la, 11 lb force mounted on it!
- the light emitting elements 11 la and 11 lb are mutually connected via a non-junction 115, four layers of aluminum wiring (1118a, 1118a ', 1118b, 1118b ⁇ 1118c, 1118c', 1118d, 1118 d '), P type diffusion resistance 1002 Are electrically connected.
- the other configuration of the light emitting device of the seventh embodiment is the same as that of the first embodiment. Therefore, duplicate explanations are omitted. Since the configuration of the main part is the same also in the seventh embodiment, the same effect as the light emitting device of the first embodiment is obtained.
- a plurality of convex lenses 119 may be arranged in accordance with the number of light emitting elements 111.
- FIG. 15 (a) is a plan view showing the shape of an aluminum wiring which is a conductive path of the eighth embodiment.
- FIGS. 15 (b) to 15 (d) are diagrams in which two, three and four light emitting elements are mounted on an aluminum wiring 1510, respectively.
- the aluminum wires 1510 in FIGS. 15 (a) to 15 (d) all have the same shape.
- the aluminum wiring 1510 of the light emitting device of the eighth embodiment has a shape that can electrically connect two to four arbitrary numbers of light emitting elements.
- a plurality of aluminum wires 1510 are mounted on driver IC chip 112.
- white circles 1511 on the aluminum wiring 1510 indicate the positions of the bumps.
- the light emitting elements 1501 to 1509 are electrically connected to the aluminum wiring 1510 through the bumps provided on the aluminum wiring 1510.
- the difference between the light emitting device of the eighth embodiment and the first embodiment is only in the shape of the aluminum wiring 1510.
- Figure 15 (b)-(c) A path 1512 through which current flows is shown between the bumps 1511 and the bumps 1511 to which the light emitting elements 1501 to 1509 are connected.
- different numbers can be obtained only by changing the mounting locations of light emitting elements 1501 to 1509 using one type of conductive path pattern (for example, the pattern of aluminum interconnection 1510).
- a plurality of light emitting devices having light emitting elements can be produced.
- only one type of mask is required to form the conductive path pattern.
- it is possible to manufacture a light emitting device according to demand by combining one driver IC chip and an arbitrary light emitting element it is possible to reduce the inventory of driver IC chips as a material of LED. It can reduce factory management costs.
- the driver IC chip 112 of the light emitting device of the eighth embodiment may have an external connection terminal for varying the current supplied to the light emitting element or the voltage applied to the light emitting element.
- the configuration other than the shape of the aluminum interconnection which is a conductive path is the same as that of the first embodiment. Therefore, duplicate explanations are omitted. Since the configuration of the main part is the same also in this eighth embodiment, it has the same effect as the light emitting device of the first embodiment. In this embodiment mode, a plurality of convex lenses may be provided in accordance with the number of light emitting elements.
- the light emitting devices of Embodiments 1 to 8 described above may have a plurality of visible light emitting elements that emit light at different wavelengths.
- the light emitting devices of Embodiments 1 to 8 described above may have a plurality of visible light emitting elements that respectively emit light in the three primary colors of red, green and blue.
- a lighting device in which a plurality of the light-emitting devices according to the above-described Embodiment 1 to Embodiment 8 are connected in parallel can be manufactured.
- the present invention is useful for a semiconductor chip for driving a light emitting element, a light emitting device and a lighting device.
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JP2006512534A JPWO2005104248A1 (ja) | 2004-04-19 | 2005-04-18 | 発光素子駆動用半導体チップ、発光装置及び照明装置 |
US10/599,966 US20070257901A1 (en) | 2004-04-19 | 2005-04-18 | Semiconductor chip for driving light emitting element, light emitting device, and lighting device |
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JP2004-123453 | 2004-04-19 | ||
JP2004123453 | 2004-04-19 |
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JP2011009717A (ja) * | 2009-06-26 | 2011-01-13 | Intel Corp | 制御可能な発光素子を有する発光デバイス |
JP2011177861A (ja) * | 2010-03-03 | 2011-09-15 | Toshiba Corp | 半導体装置 |
KR20110121697A (ko) * | 2009-02-05 | 2011-11-08 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | Led 콤비네이션을 위한 개선된 패키징 |
JP2012060133A (ja) * | 2010-09-10 | 2012-03-22 | Samsung Led Co Ltd | 発光デバイス、照明装置およびバックライト |
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US8076680B2 (en) * | 2005-03-11 | 2011-12-13 | Seoul Semiconductor Co., Ltd. | LED package having an array of light emitting cells coupled in series |
DE102009022901A1 (de) * | 2009-05-27 | 2010-12-02 | Osram Opto Semiconductors Gmbh | Optoelektronisches Modul und Verfahren zur Herstellung eines optoelektronischen Moduls |
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KR101766297B1 (ko) | 2011-02-16 | 2017-08-08 | 삼성전자 주식회사 | 발광소자 패키지 및 그 제조방법 |
JP5962285B2 (ja) * | 2012-07-19 | 2016-08-03 | 日亜化学工業株式会社 | 発光装置およびその製造方法 |
US20140167083A1 (en) * | 2012-12-19 | 2014-06-19 | Avago Technologies General Ip (Singapore) Pte. Ltd. | Led package with integrated reflective shield on zener diode |
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DE102018215951A1 (de) * | 2018-09-19 | 2020-03-19 | Osram Gmbh | Lichtemittierende vorrichtung und verfahren zum herstellen derselben |
CN113990212A (zh) * | 2020-07-27 | 2022-01-28 | 北京芯海视界三维科技有限公司 | 发光模组及显示器件 |
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Cited By (12)
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WO2008083672A2 (de) * | 2007-01-11 | 2008-07-17 | Osram Opto Semiconductors Gmbh | Gehäuse für optoelektronisches bauelement und anordnung eines optoelektronischen bauelementes in einem gehäuse |
WO2008083672A3 (de) * | 2007-01-11 | 2008-12-18 | Osram Opto Semiconductors Gmbh | Gehäuse für optoelektronisches bauelement und anordnung eines optoelektronischen bauelementes in einem gehäuse |
US9054279B2 (en) | 2007-01-11 | 2015-06-09 | Osram Opto Semiconductors Gmbh | Optoelectronic component disposed in a recess of a housing and electrical componenet disposed in the housing |
KR20110121697A (ko) * | 2009-02-05 | 2011-11-08 | 코닌클리즈케 필립스 일렉트로닉스 엔.브이. | Led 콤비네이션을 위한 개선된 패키징 |
JP2012517115A (ja) * | 2009-02-05 | 2012-07-26 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Ledの組み合わせの改良された実装 |
KR101689312B1 (ko) * | 2009-02-05 | 2016-12-23 | 코닌클리케 필립스 엔.브이. | Led 콤비네이션을 위한 개선된 패키징 |
JP2011009717A (ja) * | 2009-06-26 | 2011-01-13 | Intel Corp | 制御可能な発光素子を有する発光デバイス |
JP2011177861A (ja) * | 2010-03-03 | 2011-09-15 | Toshiba Corp | 半導体装置 |
JP2012060133A (ja) * | 2010-09-10 | 2012-03-22 | Samsung Led Co Ltd | 発光デバイス、照明装置およびバックライト |
US9741640B2 (en) | 2010-12-20 | 2017-08-22 | Rohm Co., Ltd. | Semiconductor device |
JP2020501190A (ja) * | 2017-09-26 | 2020-01-16 | エルジー・ケム・リミテッド | 透明発光素子ディスプレイ |
US10854786B2 (en) | 2017-09-26 | 2020-12-01 | Lg Chem, Ltd. | Transparent light emitting device display |
Also Published As
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---|---|
CN1943049A (zh) | 2007-04-04 |
JPWO2005104248A1 (ja) | 2007-08-30 |
US20070257901A1 (en) | 2007-11-08 |
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