WO2012042962A1 - 発光装置および発光装置の製造方法 - Google Patents
発光装置および発光装置の製造方法 Download PDFInfo
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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
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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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
- H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
- H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
- H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
- H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
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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
- H01L2224/48135—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip
- H01L2224/48137—Connecting between different semiconductor or solid-state bodies, i.e. chip-to-chip the bodies being arranged next to each other, e.g. on a common substrate
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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 light-emitting device that can be used in lighting fixtures such as LED bulbs and spotlights, and a method for manufacturing the light-emitting device.
- light emitting devices in which a plurality of light emitting elements are arranged on a substrate have been developed.
- the light emitting elements used in such a light emitting device have different colors (wavelengths) for each wafer (manufacturing lot) and each manufacturing apparatus used.
- characteristics such as light output (output).
- light emitting elements are usually classified into a plurality of ranks in advance according to color, output, and the like, and light emitting elements of the same rank are used in the same light emitting device, so that the characteristics of the light emitting elements are made uniform.
- Patent Document 1 a display device having a plurality of sets of LEDs that are modulated at the same time, the LED set has a luminous intensity distribution formed in a region between the maximum luminous intensity of the LED and the minimum luminous intensity of the LED.
- a display device configured by combining LEDs having substantially symmetrical luminous intensity with respect to the center.
- Patent Document 2 proposes a mounting method of LED chips in which a plurality of LED chips are mounted in a grid pattern on a substrate, and the LED chips having the same production lot are arranged so as not to be adjacent to each other. Yes.
- Patent Document 3 a wafer on which a plurality of light emitting elements are arrayed is divided into blocks, and average characteristics such as wavelengths and luminances of the plurality of light emitting elements in the block are measured.
- a manufacturing method of a display device in which blocks are rearranged and transferred to the relay substrate so that the distribution of characteristic averages is uniform.
- Japanese Patent Laid-Open No. 2000-047606 see FIGS. 1 and 2) JP 2008-0783365 A (see FIGS. 9 and 10) Japanese Patent Laying-Open No. 2010-087064 (see FIG. 5)
- a light emitting element used in a light emitting device may have variations in forward voltage (hereinafter referred to as V f ) for each wafer, in addition to the characteristics such as color and output.
- V f is a voltage necessary for a current to flow in the forward direction with respect to the light emitting element (light emitting diode), that is, a voltage necessary for the light emitting element to emit light.
- a light-emitting element with a low Vf easily flows current, and a light-emitting element with a high Vf hardly flows current.
- the V f of the light emitting element There is a case where the current flowing due to the variation is biased. Therefore, in the techniques proposed in Patent Documents 1 to 3, the light output varies depending on the connection method of the light emitting elements and the variation in V f , thereby causing unevenness in brightness (light emission unevenness) in the light emitting device, and a plurality of light emitting elements. There may be a difference in luminance distribution (output distribution) between devices.
- the present invention has been made in view of the above problems, and pays attention to the fact that when a plurality of light emitting elements are connected in series, the current flowing through the light emitting elements is averaged. It is an object of the present invention to provide a light-emitting device and a method for manufacturing the light-emitting device that can suppress a difference in luminance distribution.
- a light emitting device includes a plurality of light emitting elements that emit light of the same color in a plurality of row directions and column directions, and the plurality of light emitting elements arranged in the row direction.
- a light-emitting device in which light-emitting elements are connected in series in the row direction, and the rows in which the plurality of light-emitting elements are connected in series are connected in parallel, wherein the plurality of light-emitting elements include the first light-emitting element and the first light-emitting element.
- a second light emitting element having an output smaller than that of the element, wherein the first light emitting element and the second light emitting element are alternately arranged in the row direction.
- the light emitting device can reduce luminance unevenness by using two types of light emitting elements having different outputs in series connection and parallel connection. Further, as will be described later, since the difference in luminance distribution among the plurality of light emitting devices can be suppressed even when the variation in V f of the light emitting elements occurs, the light emitting elements constituting the light emitting device are limited to specific V f only. Without this, the difference in luminance distribution between the light emitting devices can be suppressed.
- At least one of the rows is different in average value of forward voltages of the light emitting elements from other rows.
- the average value of V f of the light emitting elements in the row is different from that of other rows.
- two types of light emitting elements having different outputs are alternately arranged in the row direction in which the light emitting elements are connected in series.
- the light output in the row direction can be dispersed without being uniformly high or low. Even if light emitting elements having different Vf are included in a plurality of light emitting elements, light emitting elements having different outputs are easily dispersed throughout, and it is difficult for light and dark to concentrate on a specific row. Can be small.
- the light emitting device preferably has a configuration in which the first light emitting element and the second light emitting element are continuously arranged in the column direction.
- the light emitting device preferably has a configuration in which the first light emitting elements and the second light emitting elements are alternately arranged in the column direction.
- the light emitting device can disperse the light output in the row direction and the column direction, and can reduce luminance unevenness.
- a light emitting element having a different Vf is included in the plurality of light emitting elements, even if the current flowing through the row including the light emitting element having a different Vf increases or decreases, Since the light emitting elements having different outputs are arranged alternately in the column direction as well as in the row direction connected in series, the light output in the row direction and the column direction can be dispersed. Further, even if light emitting elements having different Vf are included in the plurality of light emitting elements, brightness and darkness are not concentrated on a specific row and column, so that luminance unevenness can be reduced as a whole.
- the number of the first light emitting elements and the number of the second light emitting elements arranged alternately in the respective row directions are the same.
- the two types of light emitting elements having different outputs are arranged in a balanced manner at least in the row direction, so that the light emitting elements having different outputs can be more uniformly dispersed.
- the luminance unevenness of the light emitting device can be reduced.
- the light emitting elements can be more uniformly dispersed, and the luminance unevenness of the light emitting device can be reduced.
- a light emitting device includes a plurality of light emitting elements that emit light of the same color in a row direction and a column direction, and the plurality of light emitting elements that are disposed in the row direction.
- a light-emitting device in which light-emitting elements are connected in series in the row direction, and the rows in which the plurality of light-emitting elements are connected in series are connected in parallel, wherein the plurality of light-emitting elements include the first light-emitting element and the first light-emitting element.
- a second light emitting element having an output smaller than the element, and a third light emitting element having an output smaller than the second light emitting element, the first light emitting element, the second light emitting element, and the third light emitting element. are arranged in a predetermined order in each row direction.
- the light emitting device can reduce luminance unevenness by using three types of light emitting elements having different outputs in series connection and parallel connection. Further, as will be described later, since the difference in luminance distribution among the plurality of light emitting devices can be suppressed even when the variation in V f of the light emitting elements occurs, the light emitting elements constituting the light emitting device are limited to specific V f only. Without this, the difference in luminance distribution between the light emitting devices can be suppressed.
- At least one of the rows has an average value of forward voltages of the light emitting elements different from that of the other rows.
- the light emitting device when light emitting elements having different Vf are included in the plurality of light emitting elements, the current flowing through the row including the light emitting elements having different Vf is increased or decreased. Even in this case, since the three types of light emitting elements having different outputs in the row direction in which the light emitting elements are connected in series are arranged in a predetermined order, the light output in the row direction is uniformly high or low. In other words, the light output in the row direction can be dispersed. Even if light emitting elements having different Vf are included in a plurality of light emitting elements, light emitting elements having different outputs are easily dispersed throughout, and it is difficult for light and dark to concentrate on a specific row. Can be small.
- the light emitting device preferably has a configuration in which the first light emitting element, the second light emitting element, and the third light emitting element are continuously arranged in the column direction.
- the light emitting device preferably has a configuration in which the first light emitting element, the second light emitting element, and the third light emitting element are arranged in a predetermined order in the column direction.
- the light-emitting device includes not only the row direction in which the light-emitting elements are connected in series, but also the light-emitting elements having different outputs in the column direction. Therefore, the light output in the row direction and the column direction can be dispersed, and the luminance unevenness of the light emitting device can be reduced.
- a light emitting element having a different Vf is included in the plurality of light emitting elements, even when the current flowing in the row including the light emitting element having a different Vf increases or decreases, The light output in the column direction is not uniformly high or low, and the light output in the row direction and the column direction can be dispersed. Further, even if light emitting elements having different Vf are included in the plurality of light emitting elements, brightness and darkness are not concentrated on a specific row and column, so that luminance unevenness can be reduced as a whole.
- the number of the first light emitting elements, the number of the second light emitting elements, and the number of the third light emitting elements arranged in a predetermined order in each row direction are the same number. It is preferable that
- the light emitting devices having different outputs can be more uniformly dispersed.
- the luminance unevenness of the entire light emitting device can be reduced.
- the light emitting elements can be more uniformly dispersed, and the luminance unevenness of the entire light emitting device can be reduced.
- the light-emitting device includes a substrate on which the plurality of light-emitting elements are arranged, a positive electrode and a negative electrode that are formed on the substrate and apply a voltage to the plurality of light-emitting elements, and the plurality of light-emitting elements. And a light reflecting resin formed on the substrate so as to surround the periphery.
- the light extraction efficiency of the light emitting device can be improved.
- a light emitting device emits light of the same system, and includes a plurality of light emitting elements arranged in a plurality of row directions and column directions, and the plurality of light emitting elements.
- a positive electrode wiring portion and a negative electrode wiring portion formed on the substrate and electrically connected to the plurality of light emitting elements, and the positive electrode wiring portion and the negative electrode wiring portion.
- a positive electrode and a negative electrode for applying a voltage to the light-emitting element, and the plurality of light-emitting elements are connected in series by the same number, and light-emitting elements serving as end portions of the respective series connections are arranged in a column direction.
- the positive wiring portion and the negative wiring portion are electrically connected in parallel, and the plurality of light emitting elements have a first light emitting element and a smaller output than the first light emitting element.
- the second light emitting element Becomes, the first light emitting element and the second light emitting element has a structure in which are arranged alternately in the row direction.
- the light emitting device can reduce luminance unevenness by using two types of light emitting elements having different outputs in series connection and parallel connection. Further, as will be described later, since the difference in luminance distribution among the plurality of light emitting devices can be suppressed even when the variation in V f of the light emitting elements occurs, the light emitting elements constituting the light emitting device are limited to specific V f only. Without this, the difference in luminance distribution between the light emitting devices can be suppressed.
- the light emitting device preferably has a configuration in which the first light emitting element and the second light emitting element are continuously arranged in the column direction.
- the light emitting device preferably has a configuration in which the first light emitting elements and the second light emitting elements are alternately arranged in the column direction.
- the light emitting device can disperse the light output in the row direction and the column direction, and can reduce luminance unevenness.
- a light emitting element having a different Vf is included in the plurality of light emitting elements, even if the current flowing through the row including the light emitting element having a different Vf increases or decreases, Since the light emitting elements having different outputs are arranged alternately in the column direction as well as in the row direction connected in series, the light output in the row direction and the column direction can be dispersed. Further, even if light emitting elements having different Vf are included in the plurality of light emitting elements, brightness and darkness are not concentrated on a specific row and column, so that luminance unevenness can be reduced as a whole.
- the number of the first light emitting elements and the number of the second light emitting elements arranged alternately in the respective row directions are the same.
- the two types of light emitting elements having different outputs are arranged in a balanced manner at least in the row direction, so that the light emitting elements having different outputs can be more uniformly dispersed.
- the luminance unevenness of the light emitting device can be reduced.
- the light emitting elements can be more uniformly dispersed, and the luminance unevenness of the light emitting device can be reduced.
- a method for manufacturing a light-emitting device includes a plurality of light-emitting elements emitting light of the same system arranged in a plurality of row directions and column directions, and arranged in the row direction.
- the plurality of light emitting elements are connected in series in the row direction, and the plurality of light emitting elements connected in series are connected in parallel.
- a light emitting element classification step for classifying light emitting elements into a first group and a second group having an output smaller than that of the first group, and a substrate on which a positive electrode and a negative electrode are formed are selected from the first group.
- the light-emitting elements arranged in a direction are connected in series, said each row are connected in parallel, a light emitting element disposed step of electrically connecting the light emitting element and the positive electrode and the negative electrode, and be performed.
- the method for manufacturing a light-emitting device can manufacture a light-emitting device in which luminance unevenness is suppressed by using two types of light-emitting elements having different outputs in series connection and parallel connection.
- a light emitting element having a different Vf is included in the plurality of light emitting elements, even if the current flowing through the row including the light emitting element having a different Vf increases or decreases, Two types of light emitting elements with different outputs in the row direction connected in series are arranged in a predetermined order, so that the light output in the row direction does not become uniformly high or low, and the light output in the row direction is dispersed.
- a light emitting device that can be made to be manufactured can be manufactured. Further, even if light emitting elements having different Vf are included in the plurality of light emitting elements, light and darkness does not concentrate on a specific row, and thus a light emitting device that can reduce luminance unevenness as a whole can be manufactured. .
- the light emitting element arranging step includes a first stage in which the plurality of first light emitting elements are arranged in the column direction, and the plurality of first arranged in the first stage.
- the second stage of arranging a plurality of the second light emitting elements in the column direction at positions adjacent to the one light emitting element is performed.
- the manufacturing method of the light emitting device can easily and accurately arrange the first light emitting element and the second light emitting element having different outputs on the substrate.
- the light emitting device of the present invention it is possible to reduce luminance unevenness of the light emitting device by using light emitting elements having different outputs in series connection and parallel connection, and to suppress the difference in luminance distribution between the light emitting devices. . Further, according to the method for manufacturing a light emitting device according to the present invention, it is possible to easily manufacture a light emitting device capable of suppressing the luminance unevenness and the difference in luminance distribution between the light emitting devices as described above.
- FIG. 4B is a schematic diagram illustrating the arrangement of a plurality of light emitting elements
- FIG. 5B is a schematic diagram illustrating a flow shunt simulation result of the plurality of light emitting elements
- FIG. 5B is a schematic diagram illustrating a flow shunt simulation result of the plurality of light emitting elements
- FIG. 6 is a schematic diagram for explaining changes in current and heat distribution when a low Vf element is included in the second to sixth rows in a plurality of light emitting devices connected in series in the row direction, Is a schematic diagram showing the arrangement of a plurality of light emitting elements, (b) is a schematic diagram showing the results of a shunt simulation of the plurality of light emitting elements, and (c) is a schematic diagram showing the heat distribution of the plurality of light emitting elements. .
- FIG. 1 is a schematic which shows the light output of the 1st light emitting element and the 2nd light emitting element in case Vf of all the elements is the same.
- FIG. (b) is a schematic view showing an optical output of the first light emitting element and the second light emitting device when the low V f element or high V f element is included in two rows,
- a low V f It is the schematic which shows the light output of the 1st light emitting element and the 2nd light emitting element in case an element or a high Vf element is contained in all the rows.
- the first light emitting element and the second light emitting element in the case where the low Vf element is included in the plurality of light emitting elements. It is the schematic for demonstrating the relationship between arrangement
- FIG, (b) is a schematic view showing an optical output of the first light emitting element and the second light emitting device when the low V f element or high V f element is included in two rows, (c) a low V f It is the schematic which shows the light output of the 1st light emitting element and the 2nd light emitting element in case an element or a high Vf element is contained in all the rows. It is the schematic for demonstrating the light emitting element arrangement
- FIG. 1 It is the schematic which shows arrangement
- FIG. It is the schematic which shows arrangement
- FIG. It is the schematic which shows arrangement
- FIG. It is the schematic which shows arrangement
- the light emitting device 100 according to the first embodiment will be described in detail with reference to FIGS.
- the overall configuration of the light emitting device 100 is first described, and then each configuration is described.
- the light reflecting resin 6 in FIG. 2 shows only the outline.
- the p-electrode 2a and the n-electrode 2b of the light-emitting element 2 in FIG. 2 are shown only at four places on the mounting area 1a in order to indicate the direction of each light-emitting element 2, and other parts on the mounting area 1a are shown.
- the illustration is omitted at the points.
- the wire W for connecting the first light emitting element 21 and the second light emitting element 22 in series in the row direction is not shown.
- the light emitting device 100 is a device that can be used for, for example, a lighting fixture such as an LED bulb or a spotlight. As shown in FIGS. 1 and 2, the light emitting device 100 includes a substrate 1, a plurality of light emitting elements 2 arranged in a mounting region 1 a of the substrate 1, a positive electrode 3 and a negative electrode 4 formed on the substrate 1, a positive electrode 3, a protection element 5 disposed on the substrate 3, electronic components such as the light emitting element 2 and the protection element 5, a wire W connecting the positive electrode 3 and the negative electrode 4, a light reflecting resin 6 formed on the substrate 1, a light A sealing member 7 filled in the reflective resin 6 is provided as a main configuration.
- the substrate 1 is for arranging electronic components such as the light emitting element 2 and the protective element 5. As shown in FIGS. 1 and 2, the substrate 1 is formed in a rectangular flat plate shape. On the substrate 1, a mounting region 1 a for arranging a plurality of light emitting elements 2 is defined as shown in FIG. 2.
- the size and shape of the substrate 1 are not particularly limited, and can be appropriately selected according to the purpose and application such as the number of light emitting elements 2 and the arrangement interval.
- the mounting area 1 a is an area for arranging a plurality of light emitting elements 2. As shown in FIG. 2, the mounting area 1 a is partitioned into a central area of the substrate 1. A part of the wiring part 3b and a part of the wiring part 4b are formed around the mounting area 1a along the left side of the mounting area 1a in a plan view of FIG. A part of the wiring part 4b is formed along the side of the wiring, and the relay wiring part 8 is formed along the right side of the mounting region 1a.
- the periphery of the mounting region 1a means a periphery at a predetermined interval from the periphery of the mounting region 1a, as shown in FIG.
- the mounting region 1a may be a region partitioned on the substrate 1 for arranging the plurality of light emitting elements 2, that is, a region made of the same material as the substrate 1, but for example, reflects light on the mounting region 1a. It is preferable to form a metal film and arrange a plurality of light emitting elements 2 through the metal film (not shown). Thus, by forming a metal film on the mounting region 1a and disposing the plurality of light emitting elements 2 thereon, light directed toward the mounting region 1a of the substrate 1 can also be reflected by the metal film. Therefore, loss of emitted light can be reduced, and light extraction efficiency of the light emitting device 100 can be improved.
- the metal film for example, Ag (silver) or Au (gold) is preferably used, and Ag is particularly preferably used.
- Au has a characteristic of easily absorbing light.
- the light reflectance can be increased by further forming a TiO 2 film on the surface of Au plating.
- the light extraction efficiency of the light-emitting device 100 can be improved as compared with plating using Au alone.
- the thickness of the metal film formed on the mounting region 1a is not particularly limited and can be appropriately selected according to the purpose and application.
- the light emitting element 2 is a semiconductor element that emits light by applying a voltage. As shown in FIG. 2, a plurality of light emitting elements 2 are arranged in the mounting region 1 a of the substrate 1, and the plurality of light emitting elements 2 together constitute a light emitting unit 20 of the light emitting device 100. The illustrated light emitting unit 20 simply indicates a region where the light emitting element 2 is placed.
- Each of the light emitting elements 2 is formed in a rectangular shape in plan view as shown in FIG.
- the light emitting element 2 is a face-up (FU) element in which a p electrode 2 a is provided on one side of the upper surface and an n electrode 2 b is provided on the other side of the light emitting element 2.
- the plurality of light emitting elements 2 arranged on the mounting area 1a of the substrate 1 include a first light emitting element 21 having a predetermined output, a second light emitting element 22 having an output smaller than the first light emitting element 21, (See FIG. 5).
- the first light emitting element 21 and the second light emitting element 22 have substantially the same structure and shape. Specifically, the same material is used. It is preferable that the light emitting device is manufactured using the same manufacturing process.
- a light emitting diode that emits the same color as the light emitting element 2, and a light emitting element having an arbitrary wavelength can be selected according to the application.
- a light emitting element 2 of blue (light with a wavelength of 430 nm to 490 nm) and green (light with a wavelength of 490 nm to 570 nm) a nitride semiconductor (In X Al Y Ga 1-XY N, 0 ⁇ X, 0 ⁇ Y, X + Y ⁇ 1) can be used.
- the plurality of light emitting elements that emit colors of the same system preferably have a wavelength difference of 20 nm or less, and more preferably 15 nm or less and 10 nm or less.
- a light-emitting element with a range of 450 nm to 465 nm can be used, and a light-emitting element with a range of 450 nm to 457.5 nm or a range of 457.5 nm to 460 nm is more preferable.
- the component composition, light emission color, size, and the like of the light emitting element 2 are not limited to the above, and can be appropriately selected according to the purpose. Further, as the light-emitting element 2, a face-down light-emitting element that is flip-chip mounted or a light-emitting element having a counter electrode structure can be used.
- the first light-emitting element 21 and the second light-emitting element 22 are based on the average value of the outputs of the plurality of light-emitting elements 2 mounted on the light-emitting device 100, and the first light-emitting element 21 with a high output and the second light-emitting element 22 with a low output.
- the light emitting element 22 is preferably classified. Specifically, as will be described later, when the average value of the output of the light emitting element 2 is “1”, the first light emitting element 21 has an output in the range of “1 to 1.2”. It is preferable to use the second light emitting element 22 whose output is in the range of “0.8 to 1”.
- the difference between the outputs of the first light emitting element 21 and the second light emitting element 22 adjacent in the row direction is “1” as the average value of the output of the first light emitting element 21 and the output of the second light emitting element 22.
- it is preferably “0.02 or more”, more preferably “0.05 or more”, and most preferably “0.1 or more”.
- the difference in output between the first light emitting element 21 and the second light emitting element 22 adjacent in the row direction is preferably “0.4 or less”, “0.3 or less” is more preferable, and “0.2 or less” is most preferable. In particular, it is preferable to use those in the range of “0.02 to 0.3”.
- such measurement and classification of the output is performed before mounting the light emitting element 2, and measurement is performed by passing a constant current through each light emitting element 2 in a state where the light emitting element 2 is not connected in series or in parallel. Can do.
- the light emitting elements 2 are arranged at equal intervals in the row direction (horizontal direction) and the column direction (vertical direction) on the mounting region 1a.
- 8 rows ⁇ 6 columns A description will be given of an example in which a total of 48 pieces (8 vertical x 6 horizontal) are arranged.
- the light emitting elements 2 are connected in series by electrically connecting the light emitting elements 2 adjacent to each other in the row direction with respect to the mounting region 1 a by a conductive wire W.
- the series connection means a state in which the p-electrode 2a and the n-electrode 2b in the adjacent light-emitting elements 2 are electrically connected by a wire W as shown in FIG.
- the p electrodes 2a of the plurality of light emitting elements 2 face the left side which is one direction of the mounting region 1a.
- the n electrodes 2b of the plurality of light emitting elements 2 are arranged so as to face the right side which is the other direction of the mounting region 1a.
- the light emitting element 2 has a right side in which the p electrodes 2a of the plurality of light emitting elements 2 are in the other direction of the mounting region 1a between the wiring part 4b of the negative electrode 4 and the relay wiring part 8.
- the n electrodes 2b of the plurality of light emitting elements 2 are arranged so as to face the left side, which is one direction of the mounting region 1a. That is, the light emitting element 2 is arranged so that the direction is reversed with the relay wiring portion 8 as a boundary when FIG. 2 is viewed in plan.
- the relay wiring portion 8 is formed along the periphery of the mounting region 1a as described above, and the light emitting element 2 is arranged so that the direction is reversed with the relay wiring portion 8 as a boundary.
- the number of the light emitting elements 2 connected in series can be increased within the limited area of the mounting region 1a without complicating the wiring for connecting the light emitting elements 2 to each other.
- a plurality of light emitting elements 2 can be densely arranged, and the light emitting device 100 with improved power consumption with respect to constant luminance or constant power consumption.
- the light emitting device 100 with improved luminous efficiency can be obtained.
- the six light emitting elements 2 are connected in series at the upper stage portion and the lower stage portion, respectively.
- Four lines are formed in series, and the upper and lower stages are connected in series by a relay wiring section 8 to be described later.
- the light emitting elements 2 are arranged in the row direction and the column direction, and a plurality of light emitting elements 2 arranged in the row direction are connected in series.
- the light emitting elements 2 having a lower V f than the other light emitting elements (hereinafter referred to as low V). ) and that f elements, high light-emitting element 2 (hereinafter the V f, when included) of high V f elements, the current flowing through the light emitting element 2 changes line by line.
- FIG. 3 first pattern
- FIG. 4 second pattern
- a total of 30 light emitting elements 2 ′ arranged in 6 rows ⁇ 5 columns on the substrate 1 ′ are shown.
- the light emitting elements 2 ′ are connected in series in each row.
- the first to sixth lines are connected in parallel.
- a V f of the normal of the light emitting element 2 'and 3.45V has a V f of the low V f elements and 3.3V.
- 3B and 4B indicate current [mA]]
- the numbers in FIGS. 3C and 4C relatively indicate the temperature of the light emitting element.
- the first pattern is a case where all of the sixth row are low Vf elements.
- a current of 720 mA is passed through the first to sixth rows connected in parallel to cause a current of 120 mA to flow through each light emitting element 2 ′, one row as shown in FIG. A current of 114 mA flows through the light emitting elements 2 ′ arranged in the fifth to fifth rows, and a current of 149 mA flows through the light emitting elements 2 ′ arranged in the sixth row. That is, if a low Vf element is included in the plurality of light emitting elements 2 ′, the current flowing through the entire row including the low Vf element increases, and the entire row not including the low Vf element is included.
- FIG. 3B shows the result of the shunt simulation.
- the temperature in the sixth row is changed to that in the first row as shown by the frame in FIG. It can be confirmed that the temperature rises overall from the temperature.
- the central area where the light emitting element 2 'is concentrated is the highest temperature, and the temperature decreases as the distance from the center decreases. In this way, the bias can be confirmed in the heat distribution. It is considered that the current bias as shown in FIG.
- the second pattern is a case where the low Vf elements are included in the second to sixth rows as shown in FIG. This assumes a case where low Vf elements are included at random.
- the first pattern in order to cause a current of 120 mA to flow through each light emitting element 2 ′, when a current of 720 mA is passed through the first to sixth rows connected in parallel, FIG. ), A current of 115 mA flows through the light emitting element 2 ′ arranged in the first row, and a current of 121 mA flows through the light emitting elements 2 ′ arranged in the second to sixth rows.
- FIG. 4B shows the result of the shunt simulation.
- a moderate temperature is applied to the entire second to sixth rows. An increase can be confirmed. For this reason, it is considered that the current bias actually occurs as shown in FIG.
- V f of the light emitting element 2 since it is possible to measure in advance similarly to the output, and classified with previously ranked V f of the light emitting element 2, taking into account the V f in addition to the output
- the light emitting element 2 can also be arranged on the substrate 1 using only a specific rank. However, if the V f is ranked in addition to the output and the ranks other than the specific rank are excluded, the yield of the light emitting elements 2 is significantly reduced. Therefore, there is a need for a method that minimizes the influence of current bias caused by the light emitting elements 2 having different Vf without requiring the ranking of Vf .
- the light emitting device 100 includes the first light emitting element 21 having a predetermined output from the plurality of light emitting elements 2 and the second light emitting element 22 having an output smaller than the first light emitting element 21 as described above.
- the first light emitting elements 21 and the second light emitting elements 22 are alternately arranged in the row direction. That is, as shown in FIG. 5A, the first light-emitting element 21 and the second light-emitting element 22 have a low-power second light-emitting element 22 in the row direction from the first row and first column (upper left corner), and a high-power output.
- the first light emitting elements 21 are alternately arranged in this order, and the outputs of the light emitting elements 2 are arranged so as to alternately change in the row direction.
- FIG. 6 first pattern
- FIG. 7 second pattern
- 6 and 7 a total of 16 light-emitting elements 2 (first light-emitting elements 21 and second light-emitting elements 22) arranged in 4 rows ⁇ 4 columns on the substrate 1 are illustrated. Yes.
- the light emitting elements 2 are connected in series in the row direction, and these columns are connected in parallel.
- the numerical value in the 1st light emitting element 21 and the 2nd light emitting element 22 in FIG. 6 and FIG. 7 has shown the optical output.
- the high-power first light-emitting elements 21 and the low-power second light-emitting elements 22 are alternately arranged in the column direction.
- the high V f element is mixed, the current flowing through the entire element in the second row increases in the third line
- the current flowing through the entire element in the third row decreases.
- the variation in the average value of the light output from the first row to the fourth row increases, and the luminance unevenness increases.
- the second pattern is a case where the high-output first light-emitting elements 21 and the low-output second light-emitting elements 22 are alternately arranged in the row direction.
- the high V f element is mixed, the current flowing through the entire element in the second row increases in the third line At the same time, the current flowing through the entire element in the third row decreases.
- the luminance is dispersed without being concentrated in part, and the luminance unevenness can be reduced.
- FIG. 7B the variation in the average value of the light output from the first row to the fourth row is small, and it is considered that the difference in luminance distribution between the light emitting devices does not increase so much.
- the high V f element is mixed in the third row and the fourth row, the first row
- the luminance is not concentrated in part but is dispersed, and the variation in the average value of the light output from the first row to the fourth row is small. It is considered that the difference in luminance distribution between the light emitting devices does not increase so much.
- the first light emitting element 21 and the second light emitting element 22 are arranged as shown in FIG. Note that in the light emitting device 100, it is preferable that the average value of the forward voltage of the light emitting element 2 is different from that of the other rows in at least one row.
- the light-emitting device 100 which concerns on embodiment can make brightness nonuniformity small using serial connection and parallel connection. Further, when the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2, even when the current flowing in the row including the light emitting elements 2 having different Vf increases or decreases, Since the two types of light emitting elements 2 having different outputs are alternately arranged in the row direction in which the light emitting elements 2 are connected in series, the light output in the row direction does not become uniformly high or low, and the light in the row direction The output can be distributed.
- the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2, the light emitting elements having different outputs are easily dispersed throughout, and it is difficult for light and dark to concentrate on a specific row. Unevenness is less likely to occur. In addition, a difference in luminance distribution among the plurality of light emitting devices 100 can be suppressed.
- the first light emitting elements 21 and the second light emitting elements 22 are alternately arranged in the row direction, and the first light emitting elements 21 and the first light emitting elements 21 and The two light emitting elements 22 are preferably arranged continuously in the column direction. That is, in the light emitting device 100, it is preferable to arrange the light emitting elements 2 having the same output in the column direction as shown in FIG.
- the light emitting device 100 can accurately arrange the light emitting elements 2 in the light emitting element arranging step in the manufacturing process of the light emitting device described later.
- the number of the first light emitting elements 21 and the number of the second light emitting elements 22 arranged alternately in each row direction are the same.
- the light emitting device 100 when the light emitting device 2 having a different Vf is included in the plurality of light emitting elements 2, the light emitting device 100 according to the embodiment flows to a row including the light emitting elements 2 having the different Vf. Even when the current increases or decreases, since the two types of light emitting elements 2 having different outputs are arranged in a balanced manner at least in the row direction, the light emitting elements 2 having different outputs can be more uniformly distributed. Luminance unevenness of the light emitting device 100 can be reduced.
- the positive electrode 3 and the negative electrode 4 electrically connect a plurality of electronic components such as the light emitting elements 2 and the protection elements 5 on the substrate 1 and an external power source (not shown), and voltage from the external power source to these electronic components. Is to apply. That is, the positive electrode 3 and the negative electrode 4 play a role as electrodes for energizing from the outside or a part thereof.
- the positive electrode 3 and the negative electrode 4 are composed of metal members on the substrate 1 as shown in FIG. As shown in FIG. 2, the positive electrode 3 and the negative electrode 4 have substantially rectangular pad portions (feeding portions) 3a and 4a and linear wiring portions 3b and 4b. The pad portions 3a and 4a The applied voltage is configured to be applied to the light emitting unit 20 including the plurality of light emitting elements 2 through the wiring units 3b and 4b. As shown in FIG. 2, a cathode mark CM indicating the cathode is formed on the wiring portion 4b of the negative electrode 4.
- the pad portions 3a and 4a are for applying a voltage from an external power source. As shown in FIG. 2, the pad portions 3 a and 4 a are formed as a pair at diagonal positions on the corners on the substrate 1. The pad portions 3a and 4a are electrically connected to an external power source (not shown).
- the wiring portions 3b and 4b are for transmitting the voltage applied to the pad portions 3a and 4a from the external power source to the light emitting element 2 on the mounting region 1a. As shown in FIG. 2, the wiring portions 3b and 4b are formed so as to extend from the pad portions 3a and 4a, and are formed in a substantially L shape around the mounting region 1a.
- Au As the material of the metal member constituting the positive electrode 3 and the negative electrode 4. This is because, as will be described later, when Au having improved thermal conductivity is used as the material of the wire W, the wire W that is the same material can be firmly bonded.
- the light reflecting resin 6 is for reflecting the light emitted from the light emitting element 2. As shown in FIG. 2, the light reflecting resin 6 is formed so as to cover a part of the wiring portions 3b and 4b, the relay wiring portion 8, the protection element 5, and the wires W connected thereto. Thereby, even when the wiring portions 3b and 4b, the relay wiring portion 8 and the wire W are formed of Au that easily absorbs light as described above or later, the light emitted from the light emitting element 2 is transmitted to the wiring portion. The light reflecting resin 6 does not reach 3b, 4b, the relay wiring portion 8 and the wire W but is reflected. The light reflecting resin 6 may be omitted. For example, a substrate in which a recess is formed as the substrate 1, the light emitting element 2 is arranged on the bottom surface of the recess, and the inner wall surface of the recess can be used as a light reflecting surface.
- the light reflecting resin 6 has a rectangular shape so as to surround the periphery of the plurality of light emitting elements 2 on the substrate 1, that is, to surround the mounting region 1 a where the light emitting portion 20 is formed. It is formed in a frame shape. Thereby, the light which goes to the circumference
- an insulating material as the material of the light reflecting resin 6.
- a thermosetting resin, a thermoplastic resin, or the like can be used. More specifically, a phenol resin, an epoxy resin, a BT resin, PPA, a silicon resin, etc. are mentioned.
- the size of the light reflecting resin 6 is not particularly limited, and can be appropriately selected according to the purpose and application.
- the sealing member 7 is a member for protecting the light emitting element 2, the protective element 5, the wire W, and the like disposed on the substrate 1 from dust, moisture, external force, and the like. As shown in FIGS. 1 and 2, the sealing member 7 is formed by filling a resin in the mounting region 1 a surrounded by the light reflecting resin 6 on the substrate 1.
- a material having translucency capable of transmitting light from the light emitting element 2 is preferable. Specific examples of the material include silicon resin, epoxy resin, and urea resin.
- the relay wiring part 8 is for relaying the wiring between the positive electrode 3 and the negative electrode 4.
- the relay wiring portion 8 is composed of a metal member on the substrate 1.
- the relay wiring portion 8 is formed in a straight line around one side of the mounting area 1a, that is, the right side, around the mounting area 1a.
- the material of the metal member constituting the relay wiring portion 8 is preferably Au as in the case of the positive electrode 3 and the negative electrode 4.
- the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2. Even so, since the light emitting elements 2 having various outputs can be dispersed in the row direction and the column direction, the unevenness in luminance can be reduced, and the luminance unevenness of the light emitting device 100 and between the light emitting devices 100 can be reduced. Differences in luminance distribution can be suppressed.
- the light emitting device 100 it is possible to suppress the difference in the luminance distribution between the luminance unevenness and a light-emitting device 100 of the light emitting device 100, selection of the light emitting element 2 according to V f, i.e. the light-emitting element 2 V f Need not be excluded except for a specific rank. Therefore, the yield of the light emitting elements 2 can be improved, and an increase in cost can be suppressed.
- the average value of the output of the light emitting element 2 tends to be different for each production lot, if the light emitting element 2 is classified into a plurality of ranks based on the output, it is easy to be biased and classified for each production lot. Furthermore, since the average value of V f of the light emitting element 2 tends to be different for each production lot, for example, when the first light emitting element 21 and the second light emitting element 22 are arranged as shown in FIG. In some cases, high V f elements are concentrated in the row of the two light emitting elements 22, and low V f elements are concentrated in the row of the high output first light emitting element 21. On the other hand, according to the light emitting device 100, as shown in FIG.
- the manufacturing method of the light emitting device 100 includes a substrate manufacturing process, a plating process, a light emitting element arranging process, a protective element bonding process, a wire bonding process, a light reflecting resin forming process, and a sealing member filling process. .
- substrate preparation process is a process of producing the board
- the mounting region 1a on the substrate 1 and the portions to be the positive electrode 3 and the negative electrode 4 are formed by patterning into a predetermined shape.
- a plating wiring for forming a metal film on the mounting region 1a on the substrate 1 is formed by plating.
- the plating step is a step of forming a metal member constituting at least the positive electrode 3 and the negative electrode 4 on the substrate 1 on which the plated wiring is formed, preferably a metal member constituting the positive electrode 3 and the negative electrode 4 by electroless plating. And forming a metal film on the mounting region 1a on the substrate 1 by electrolytic plating. Moreover, when providing the relay wiring part 8, a metal member is formed in the same process as the positive electrode 3 and the negative electrode 4.
- the light emitting element classification step is a step of classifying a plurality of light emitting elements 2 that emit light of the same color into a plurality of ranks according to the brightness of each light emitting element 2.
- a plurality of light emitting elements 2 whose emission wavelengths are in the range of 450 nm to 452.4 nm and whose output is distributed in the range of about 0.8 to 1.2 when the average value is 1 are output.
- 1 is a boundary, and the first group of high output and the second group of low output are classified.
- each group should just be classified on the basis of the brightness when a constant current is passed through the light emitting element 2, and in addition to the output, the luminous intensity and the radiation intensity can be measured and classified.
- it can also classify
- the group to be classified may be 3 or more.
- the first light emitting element 21 selected from the first group is classified into a total of three groups: a high output first group, a medium output third group, and a low output second group.
- the second light emitting element 22 selected from the second group can also be used.
- a pair of target groups is set around a desired output, and the light emitting elements 2 are respectively selected from the pair of groups, arranged on a substrate as described later, and connected in series. Note that the light emitting element classification step can be performed before the substrate manufacturing step or the plating step.
- positioning process is a process of arrange
- the light emitting element arranging step the light emitting element 2 is mounted on the metal film on the mounting region 1a via a bonding member, and the light emitting element 2 is bonded on the metal film on the mounting region 1a, thereby The light emitting element 2 is disposed on the substrate.
- the first light emitting element 21 selected from the first group and the second light emitting element 22 selected from the second group are arranged in the row direction and the column direction.
- the first light emitting elements 21 and the second light emitting elements 22 are arranged so as to be alternately positioned in the respective row directions.
- the protective element bonding step is a step of mounting and bonding the protective element 5 on the wiring portion 3 b of the positive electrode 3. Since the method for mounting and bonding the protective element 5 is the same as that in the light emitting element arranging step, description thereof is omitted here.
- the wire bonding step After the light emitting element arranging step, the light emitting elements 2 are connected to each other by the wire W, and the light emitting element 2 and the positive electrode 3 or the light emitting element 2 and the negative electrode 4 are electrically connected to each other by the wire W. It is. More specifically, in the wire bonding step, first, the p-electrode 2a or n-electrode 2b of the first light-emitting element 21 and the n-electrode 2b or p-electrode 2a of the second light-emitting element 22 are arranged in the row direction. By electrically connecting with the wires W, the light emitting elements 2 arranged in the row direction are connected in series.
- the p-electrode 2a of the first light-emitting element 21 or the second light-emitting element 22 serving as one end of each row connected in series in the row direction and the wiring portion 3b of the positive electrode 3 of the metal member are electrically connected by the wire W.
- the n-electrode 2b of the first light-emitting element 21 or the second light-emitting element 22 serving as the other end of each row and the wiring part 4b of the negative electrode 4 of the metal member are electrically connected by a wire W. By doing so, each row is connected in parallel.
- the electrical connection between the protective element 5 and the negative electrode 4 may be performed in this step. That is, the n electrode of the protection element 5 and the wiring part 4 b of the negative electrode 4 are connected by the wire W.
- the connection method of the wire W is not specifically limited, What is necessary is just to perform by the method used normally.
- the light reflecting resin forming step is a step of forming the light reflecting resin 6 so as to cover at least a part of the wiring portions 3b and 4b and the relay wiring portion 8 along the peripheral edge of the mounting region 1a after the wire bonding step. It is.
- the light reflecting resin 6 can be formed by using, for example, a resin discharge device that can move (movable) in the vertical direction or the horizontal direction with respect to the substrate 1 above the fixed substrate 1 (see FIG. (See JP2009-182307).
- the sealing member filling step is a step of filling a light-transmitting sealing member 7 covering the light emitting element 2 and the metal film inside the light reflecting resin 6. That is, the sealing member 7 that covers the light emitting element 2, the protective element 5, the metal film on the mounting region 1 a, the wire W, and the like is placed inside the wall portion made of the light reflecting resin 6 formed on the substrate 1. This is a step of injecting and then curing by heating, light irradiation or the like.
- the light emitting device according to the second embodiment will be described in detail with reference to FIG.
- the light-emitting device according to the second embodiment is the same as the light-emitting device 100 according to the first embodiment described above except for the arrangement of the light-emitting elements 2 (first light-emitting element 21 and second light-emitting element 22). It has the same configuration. Therefore, the description of the same configuration as that of the light emitting device 100 is omitted.
- the first light emitting elements 21 and the second light emitting elements 22 are alternately arranged in the row direction, and the first light emitting elements 21 and the second light emitting elements 22 are arranged.
- the light emitting elements 22 are alternately arranged in the column direction. That is, as shown in FIG. 9A, the first light emitting element 21 and the second light emitting element 22 are arranged in the row direction from the first row and the first column (upper left corner), the first light emitting element 21, Are arranged so that the output of the light emitting element 2 is alternately changed in the row direction, and the second light emitting element 22 and the first light emission in the column direction from the first row and the first column (upper left corner).
- the elements 21 are alternately arranged in this order, and the outputs of the light emitting elements 2 are arranged so as to alternately change in the column direction.
- the light emitting device when the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2, the current flowing in the row including the light emitting elements 2 having different Vf is included. Even in the case where the light output element increases or decreases, the light output elements 2 having different outputs are arranged alternately in the column direction as well as in the row direction in which the light emitting elements 2 are connected in series. Are not uniformly high or low, and the light output in the row and column directions can be dispersed. Further, even if the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2, brightness and darkness are not concentrated on a specific row and column, so that luminance unevenness can be reduced as a whole.
- the number of the light emitting elements 2 arranged in the row direction is equal to the number of the light emitting elements 2 arranged in the column direction.
- the number of the first light emitting elements 21 and the number of the second light emitting elements 22 arranged alternately in each row direction are also the same.
- the light emitting device when the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2, the current flowing in the row including the light emitting elements 2 having different Vf is included. Even when the number of light emitting elements increases or decreases, since the two types of light emitting elements 2 having different outputs are arranged in the same number and in a balanced manner in the row direction and the column direction, the light emitting elements 2 having different outputs can be more uniformly dispersed. The luminance unevenness of the light emitting device can be reduced.
- the light emitting device according to the third embodiment will be described in detail with reference to FIG. As shown in FIG. 10, the light emitting device according to the third embodiment is the first described above except for the configuration and arrangement of the light emitting element 2 ⁇ / b> A (first light emitting element 23, second light emitting element 24, third light emitting element 25).
- the configuration is the same as that of the light emitting device 100 according to the embodiment. Therefore, the description of the same configuration as that of the light emitting device 100 is omitted.
- the light emitting element 2A has a first light emitting element 23 having a predetermined output, a second light emitting element 24 having an output smaller than the first light emitting element 23, and a second light emitting element 24. And a third light emitting element 25 having a smaller output.
- the first light emitting element 23, the second light emitting element 24, and the third light emitting element 25 are arranged in a predetermined order in the row direction. . That is, as shown in FIG.
- the first light emitting element 23, the second light emitting element 24, and the third light emitting element 25 are the third light emitting elements with low output in the row direction from the first row and first column (upper left corner).
- the element 25, the medium output second light emitting element 24, and the high output first light emitting element 23 are arranged in this order, and the outputs of the light emitting elements 2A are arranged in a predetermined order in the row direction.
- the light emitting device when the light emitting element 2A having a different Vf is included in the plurality of light emitting elements 2A, the current flowing in the row including the light emitting element 2A having the different Vf is included. Even when the light output element 2A increases or decreases, since the light emitting elements 2A having different outputs are arranged in a predetermined order in the row direction in which the light emitting elements 2A are connected in series, the light output in the row direction is uniformly high or low. In other words, the light output in the row direction can be dispersed.
- the light emitting elements 2A having different Vf are included in the plurality of light emitting elements 2A, the light emitting elements having different outputs are easily dispersed throughout, and it is difficult to concentrate light and dark on a specific row. Unevenness can be reduced. In addition, a difference in luminance distribution among a plurality of light emitting devices can be suppressed.
- the first light emitting element 23, the second light emitting element 24, and the third light emitting element 25 are arranged in a predetermined order in the row direction.
- the first light emitting element 23, the second light emitting element 24, and the third light emitting element 25 are preferably arranged continuously in the column direction. That is, in the light emitting device, it is preferable to arrange the light emitting elements 2A having the same output in the column direction as shown in FIG.
- the light emitting device it becomes easy to accurately arrange the light emitting element 2A on the substrate 1 in the light emitting element arranging step in the manufacturing process of the above light emitting device.
- the light emitting device 100 includes the number of first light emitting elements 23, the number of second light emitting elements 24, and the number of third light emitting elements 25 arranged in a predetermined order in each row direction.
- the number is preferably the same.
- the light emitting device when the light emitting element 2A having a different Vf is included in the plurality of light emitting elements 2A, the current flowing in the row including the light emitting element 2A having the different Vf is included. Even when the number of light emitting elements increases or decreases, since the three types of light emitting elements 2A having different outputs are arranged in the same number and in a balanced manner at least in the row direction, the light emitting elements 2A having different outputs can be more evenly distributed. The brightness unevenness of the apparatus can be reduced.
- the light emitting device according to the fourth embodiment will be described in detail with reference to FIG.
- the light-emitting device according to the fourth embodiment is the same as the third embodiment except for the arrangement of the light-emitting elements 2A (first light-emitting element 23, second light-emitting element 24, and third light-emitting element 25). It has the same configuration as the light emitting device according to the above. Therefore, the description of the same configuration as that of the light emitting device according to the third embodiment is omitted.
- the first light emitting element 23, the second light emitting element 24, and the third light emitting element 25 are arranged in a predetermined order in the row direction.
- the first light emitting element 23, the second light emitting element 24, and the third light emitting element 25 are arranged in a predetermined order in the column direction. That is, as shown in FIG. 11A, the first light emitting element 23, the second light emitting element 24, and the third light emitting element 25 are arranged in the row direction from the first row and the first column (upper left corner).
- the second light emitting element 24 and the first light emitting element 23 are arranged in this order, and the output of the light emitting element 2A is arranged so as to change in a predetermined order in the row direction, and from the first row and first column (upper left corner).
- the third light emitting element 25, the first light emitting element 23, and the second light emitting element 24 are arranged in this order in the column direction, and the output of the light emitting element 2A is arranged to change in a predetermined order in the column direction.
- the current flowing in the row including the light emitting element 2A having the different Vf is included. Since the three types of light emitting elements 2 having different outputs are arranged in a predetermined order not only in the row direction in which the light emitting elements 2A are connected in series, but also in the column direction, The light output of the light emitting elements 2A arranged in the column direction is not uniformly high or low, and the light output in the row direction and the column direction can be dispersed. Further, even if the light emitting elements 2A having different Vf are included in the plurality of light emitting elements 2A, the brightness unevenness is not concentrated on a specific row and column, so that the luminance unevenness can be reduced as a whole.
- the number of the light emitting elements 2A arranged in the row direction and the number of the light emitting elements 2A arranged in the column direction are the same.
- the number of the first light emitting elements 23, the number of the second light emitting elements 24, and the number of the third light emitting elements 25 arranged in a predetermined order in each row direction are the same.
- the light emitting device when the light emitting element 2A having a different Vf is included in the plurality of light emitting elements 2A, the current flowing in the row including the light emitting element 2A having the different Vf is included. Even when the number of light emitting elements increases or decreases, since the three types of light emitting elements 2A having different outputs are arranged in the same number and in a balanced manner in the row direction and the column direction, the light outputs in the row direction and the column direction can be more evenly distributed. And uneven brightness of the entire light emitting device can be reduced.
- the 1st step which arrange
- the third stage in which every third light emitting element 25 is arranged in the column direction is performed, whereby the first light emitting element 23, the second light emitting element 24, and the second light emitting element 24 are arranged on the substrate 1. To do.
- the light emitting device according to the fifth embodiment will be described in detail with reference to FIG. As shown in FIG. 12, the light emitting device according to the fifth embodiment is the same as the light emitting device 100 according to the first embodiment described above except for the arrangement of the light emitting elements 2 (first light emitting element 21 and second light emitting element 22). It has the same configuration. Therefore, the description of the same configuration as that of the light emitting device 100 is omitted.
- the first light emitting elements 21 and the second light emitting elements 22 are alternately arranged in the row direction, and the first light emitting elements 21 and the second light emitting elements 22 are arranged. Are arranged in a staggered pattern in the column direction. That is, the first light emitting element 21 and the second light emitting element 22 are alternately shifted for each row as shown in FIG.
- the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2, the light emitting elements 2 having different Vf are included in the row. Even in the case where the flowing current increases or decreases, the light emitting elements 2 having different outputs are arranged alternately in the column direction as well as in the row direction in which the light emitting elements 2 are connected in series. The light output in the direction is not uniformly high or low, and the light output in the row direction and the column direction can be dispersed. Further, even if the light emitting elements 2 having different Vf are included in the plurality of light emitting elements 2, brightness and darkness are not concentrated on a specific row and column, so that luminance unevenness can be reduced as a whole.
- the light emitting device and the method for manufacturing the light emitting device according to the present invention have been specifically described by the embodiments for carrying out the invention.
- the gist of the present invention is not limited to these descriptions, and It should be interpreted broadly based on the scope description. Needless to say, various changes and modifications based on these descriptions are also included in the spirit of the present invention.
- the first light emitting element 21 and the second light emitting element 22 are the second light emitting element 22 having a low output in the row direction from the first row and the first column (upper left corner), and the first light emitting having a high output.
- the elements 21 are alternately arranged in the order, but from the first row and the first column (upper left corner), the first light emitting element 21 having high output and the second light emitting element 22 having low output are alternately arranged in the row direction. It doesn't matter.
- the first light-emitting element 23, the second light-emitting element 24, and the third light-emitting element 25 are the third light-emitting element 25 having a low output in the row direction from the first row and first column (upper left corner),
- the second light-emitting element 24 with medium output and the first light-emitting element 23 with high output are arranged in this order, but the first light-emitting element 23 with high output in the row direction from the first row and first column (upper left corner), medium output
- the second light emitting element 24 and the low power third light emitting element 25 may be arranged in this order.
- the mounting region 1 is formed in a rectangular shape as shown in FIG. 2, and a plurality of light emitting elements 2 are formed in a rectangular shape according to the shape of the mounting region 1.
- the mounting area may be formed in a circular shape, and the plurality of light emitting elements 2 may be arranged in a circular shape in accordance with the shape of the mounting area.
- a plurality of light emitting elements 2 are arranged at different intervals in the vertical and horizontal directions so that the number of matrices varies along the circular shape. Or with the same number of matrices. Further, the wiring portions 3b and 4b of the positive electrode 3 and the negative electrode 4 are formed along the periphery of the circular mounting region, and one end portions thereof are formed adjacent to each other. In addition, the same number of the plurality of light emitting elements 2 are connected in series, and the light emitting elements 2 serving as end portions of the respective series connections are arranged in the column direction, and the wiring part 3b of the positive electrode 3 and the wiring part 4b of the negative electrode 4 are respectively connected.
- the light reflecting resin 6 is formed in a circular shape so as to surround the mounting region 1a where the light emitting part 20 is formed on the substrate 1, and is connected to a part of the wiring parts 3b and 4b, the protective element 5 and these. It is formed so as to cover the wire W.
- the light-emitting device can reduce luminance unevenness by using two types of light-emitting elements 2 having different outputs in series connection and parallel connection. Further, as described above, even when the variation in V f of the light emitting element 2 occurs, the difference in luminance distribution among the plurality of light emitting devices can be suppressed, so that the light emitting element 2 constituting the light emitting device can be limited to a specific V f . Without limitation, a difference in luminance distribution between the light emitting devices can be suppressed.
- the first light emitting element 21 and the second light emitting element 22 are arranged in the row direction as in the light emitting devices according to the first to fifth embodiments. It is preferable that the first light emitting elements 21 and the second light emitting elements 22 are continuously or alternately arranged in the column direction. Similarly to the light emitting devices according to the first to fifth embodiments described above, the number of first light emitting elements 21 and the number of second light emitting elements 22 arranged alternately in each row direction may be the same. preferable.
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Abstract
Description
第1実施形態に係る発光装置100について、図1~図7を参照しながら詳細に説明する。以下の説明では、まず発光装置100の全体構成について説明した後に、各構成について説明する。なお、説明の便宜上、図2における光反射樹脂6は、輪郭線のみを示している。また、説明の便宜上、図2における発光素子2のp電極2aおよびn電極2bは、各発光素子2の向きを示すために実装領域1a上の4箇所だけ図示し、実装領域1a上のその他の箇所では図示を省略している。また、説明の便宜上、図5~図7において、第1発光素子21および第2発光素子22を行方向に直列接続するワイヤWは図示を省略している。
発光装置100は、例えば、LED電球、スポットライト等の照明器具等に利用できる装置である。発光装置100は、図1および図2に示すように、基板1と、基板1の実装領域1aに複数配置された発光素子2と、基板1上に形成された正極3および負極4と、正極3に配置された保護素子5と、発光素子2や保護素子5等の電子部品と、正極3や負極4等を接続するワイヤWと、基板1上に形成された光反射樹脂6と、光反射樹脂6内に充填された封止部材7と、を主な構成として備えている。
基板1は、発光素子2や保護素子5等の電子部品を配置するためのものである。基板1は、図1および図2に示すように、矩形平板状に形成されている。また、基板1上には、図2に示すように複数の発光素子2を配置するための実装領域1aが区画されている。なお、基板1のサイズや形状は特に限定されず、発光素子2の数や配列間隔等、目的および用途に応じて適宜選択することができる。
実装領域1aは、複数の発光素子2を配置するための領域である。実装領域1aは、図2に示すように、基板1の中央の領域に区画されている。実装領域1aの周囲には、図2を平面視した場合において、実装領域1aの左側の辺に沿って配線部3bの一部および配線部4bの一部が形成され、実装領域1aの下側の辺に沿って配線部4bの一部が形成され、実装領域1aの右側の辺に沿って中継配線部8が形成されている。なお、ここでの実装領域1aの周囲とは、図2に示すように、実装領域1aの周縁と所定の間隔を置いた周囲のことを意味している。
発光素子2は、電圧を印加することで自発光する半導体素子である。発光素子2は、図2に示すように、基板1の実装領域1aに複数配置され、当該複数の発光素子2が一体となって発光装置100の発光部20を構成している。なお、図示された発光部20は単に発光素子2を載置させる領域を示すものである。
発光素子2は、図2に示すように、実装領域1a上において、行方向(横方向)および列方向(縦方向)にそれぞれ等間隔で配列されており、ここでは、8行×6列(縦8個×横6個)の合計48個配置されているものを例にとって説明する。また、発光素子2は、図2に示すように、実装領域1aに対して行方向に隣り合う発光素子2同士が導電性のワイヤWによって電気的に接続され、直列接続されている。なお、ここでの直列接続とは、図2に示すように、隣り合う発光素子2におけるp電極2aとn電極2bとがワイヤWによって電気的に接続された状態を意味している。
正極3および負極4は、基板1上の複数の発光素子2や保護素子5等の電子部品と、図示しない外部電源とを電気的に接続し、これらの電子部品に対して外部電源からの電圧を印加するためのものである。すなわち、正極3および負極4は、外部から通電させるための電極、またはその一部としての役割を担うものである。
光反射樹脂6は、発光素子2から出射された光を反射させるためのものである。光反射樹脂6は、図2に示すように、配線部3b,4bの一部、中継配線部8、保護素子5およびこれらに接続されるワイヤWを覆うように形成される。これにより、配線部3b,4b、中継配線部8およびワイヤWを、前記あるいは後記したように光を吸収しやすいAuで形成した場合であっても、発光素子2から出射された光が配線部3b,4b、中継配線部8およびワイヤWには到達せずに光反射樹脂6によって反射される。なお、光反射樹脂6は省略してもよい。例えば、基板1として凹部が形成された基板を使用し、凹部の底面に発光素子2を配置し、凹部の内壁面を光反射面として利用することができる。
封止部材7は、基板1に配置された発光素子2、保護素子5およびワイヤW等を、塵芥、水分、外力等から保護するための部材である。封止部材7は、図1および図2に示すように、基板1上において、光反射樹脂6で囲った実装領域1a内に樹脂を充填することで形成される。封止部材7の材料としては、発光素子2からの光を透過可能な透光性を有するものが好ましい。具体的な材料としては、シリコン樹脂、エポキシ樹脂、ユリア樹脂等を挙げることができる。
中継配線部8は、正極3と負極4の間における配線を中継するためのものである。中継配線部8は、図2に示すように、基板1上の金属部材で構成されている。中継配線部8は、図2に示すように、実装領域1aの周囲において、当該実装領域1aの一辺、すなわち右側の辺に沿って直線状に形成されている。
次に、本発明の第1の実施形態に係る発光装置100の製造方法について、簡単に説明する。発光装置100の製造方法は、基板作製工程と、めっき工程と、発光素子配置工程と、保護素子接合工程と、ワイヤボンディング工程と、光反射樹脂形成工程と、封止部材充填工程と、を含む。
基板作製工程は、めっき用配線が形成された基板1を作製する工程である。基板作製工程では、基板1上の実装領域1aや、正極3および負極4となる部位を所定の形状にパターニングすることで形成する。また、基板作製工程では、めっきによって基板1上の実装領域1aに金属膜を形成するためのめっき用配線を形成する。
めっき工程は、前記めっき配線が形成された基板1上に、少なくとも正極3および負極4を構成する金属部材を形成する工程であり、好ましくは無電解めっきにより正極3および負極4を構成する金属部材を形成するとともに、基板1上の実装領域1a上に、電解めっきにより金属膜を形成する工程である。また、中継配線部8を設ける場合、正極3および負極4と同様の工程で金属部材が形成される。
発光素子分類工程は、同一系統の色を発光する複数の発光素子2を、各発光素子2の明るさによって複数のランクに分類する工程である。第1実施形態では、第1群と、前記第1群よりも小さい出力を有する第2群と、に分類する。この場合、各発光素子2に一定の電流を流して出力を測定し、その平均値付近を境界として高出力の第1群と低出力の第2群に分類することができる。例えば、発光波長が450nm~452.4nmの範囲であり、出力が、その平均値を1としたときに約0.8~1.2の範囲に分布している複数の発光素子2を、出力の平均値である1を境界として高出力の第1群と低出力の第2群に分類する。なお、各群は発光素子2に一定の電流を流した際の明るさを基準に分類されればよく、出力のほか、光度や放射強度を測定し、これによって分類することもできる。また、発光素子2の光度等の光の明るさに波長等を考慮した変換式を掛け合わせた数値によって分類することもできる。
発光素子配置工程は、基板1(金属膜)上に発光素子2を配置する工程である。発光素子配置工程は、実装領域1a上の金属膜に、接合部材を介して、発光素子2を載置し、発光素子2を実装領域1a上の金属膜上に接合することで、基板1上に発光素子2を配置する。発光素子配置工程では、具体的には、基板1上に、第1群から選択された第1発光素子21と第2群から選択された第2発光素子22とを行方向および列方向に、かつ、第1発光素子21と第2発光素子22とが各行方向に交互に位置するように配置する。
保護素子接合工程は、前記正極3の配線部3b上に保護素子5を載置して接合する工程である。保護素子5を載置、接合する方法は、前記発光素子配置工程と同様であるので、ここでは説明を省略する。
ワイヤボンディング工程は、前記発光素子配置工程の後に、発光素子2同士をワイヤWによって接続するとともに、発光素子2と正極3、あるいは、発光素子2と負極4をワイヤWによって電気的に接続する工程である。ワイヤボンディング工程では、より具体的には、まず、行方向に配置された第1発光素子21のp電極2aまたはn電極2bと、第2発光素子22のn電極2bまたはp電極2aと、をワイヤWで電気的に接続することで、行方向に配置された発光素子2同士を直列接続する。そして、行方向に直列接続された各行の一方の端部となる第1発光素子21または第2発光素子22のp電極2aと、金属部材の正極3の配線部3bと、をワイヤWで電気的に接続するとともに、各行の他方の端部となる第1発光素子21または第2発光素子22のn電極2bと、金属部材の負極4の配線部4bと、をワイヤWで電気的に接続することで、各行を並列接続する。
光反射樹脂形成工程は、前記ワイヤボンディング工程の後に、前記実装領域1aの周縁に沿って、少なくとも配線部3b,4bの一部および中継配線部8を覆うように光反射樹脂6を形成する工程である。光反射樹脂6の形成は、例えば、固定された基板1の上側において、基板1に対して上下方向あるいは水平方向などに移動(可動)させることができる樹脂吐出装置を用いて行うことができる(特開2009-182307号公報参照)。
封止部材充填工程は、前記光反射樹脂6の内側に、前記発光素子2および前記金属膜を被覆する透光性の封止部材7を充填する工程である。すなわち、発光素子2、保護素子5、実装領域1a上の金属膜およびワイヤW等を被覆する封止部材7を、基板1上に形成された光反射樹脂6からなる壁部の内部に樹脂を注入し、その後加熱や光照射等によって硬化する工程である。
第2実施形態に係る発光装置について、図9を参照しながら詳細に説明する。第2実施形態に係る発光装置は、図9に示すように、発光素子2(第1発光素子21、第2発光素子22)の配置以外は、前記した第1実施形態に係る発光装置100と同様の構成を備えている。従って、前記した発光装置100と重複する構成については、説明を省略する。
第3実施形態に係る発光装置について、図10を参照しながら詳細に説明する。第3実施形態に係る発光装置は、図10に示すように、発光素子2A(第1発光素子23、第2発光素子24、第3発光素子25)の構成及び配置以外は、前記した第1実施形態に係る発光装置100と同様の構成を備えている。従って、前記した発光装置100と重複する構成については、説明を省略する。
第4実施形態に係る発光装置について、図11を参照しながら詳細に説明する。第4実施形態に係る発光装置は、図11に示すように、発光素子2A(第1発光素子23、第2発光素子24、第3発光素子25)の配置以外は、前記した第3実施形態に係る発光装置と同様の構成を備えている。従って、前記した第3実施形態に係る発光装置と重複する構成については、説明を省略する。
第5実施形態に係る発光装置について、図12を参照しながら詳細に説明する。第5実施形態に係る発光装置は、図12に示すように、発光素子2(第1発光素子21、第2発光素子22)の配置以外は、前記した第1実施形態に係る発光装置100と同様の構成を備えている。従って、前記した発光装置100と重複する構成については、説明を省略する。
1a 実装領域
2,2A,2’ 発光素子
2a p電極
2b n電極
3 正極
3a パッド部
3b 配線部
4 負極
4a パッド部
4b 配線部
5 保護素子
6 光反射樹脂
7 封止部材
8 中継配線部
20 発光部
21,23 第1発光素子
22,24 第2発光素子
25 第3発光素子
100 発光装置
CM カソードマーク
W ワイヤ
Claims (17)
- 同一系統の色を発光する複数の発光素子が複数の行方向および列方向に配置され、かつ、前記行方向に配置された前記複数の発光素子が当該行方向に直列接続され、前記複数の発光素子が直列接続された各行が並列接続された発光装置であって、
前記複数の発光素子は、第1発光素子と、前記第1発光素子よりも小さい出力を有する第2発光素子と、からなり、
前記第1発光素子および前記第2発光素子は、前記各行方向に交互に配置されていることを特徴とする発光装置。 - 少なくとも1つの前記行は、前記発光素子の順方向電圧の平均値が他の行と異なることを特徴とする請求項1に記載の発光装置。
- 前記第1発光素子および前記第2発光素子は、前記列方向に連続して配置されていることを特徴とする請求項1または請求項2に記載の発光装置。
- 前記第1発光素子および前記第2発光素子は、前記列方向に交互に配置されていることを特徴とする請求項1または請求項2に記載の発光装置。
- 前記各行方向に交互に配置される前記第1発光素子の数と前記第2発光素子の数は、同数であることを特徴とする請求項1または請求項2に記載の発光装置。
- 同一系統の色を発光する複数の発光素子が複数の行方向および列方向に配置され、かつ、前記行方向に配置された前記複数の発光素子が当該行方向に直列接続され、前記複数の発光素子が直列接続された各行が並列接続された発光装置であって、
前記複数の発光素子は、第1発光素子と、前記第1発光素子よりも小さい出力を有する第2発光素子と、前記第2発光素子よりも小さい出力を有する第3発光素子と、からなり、
前記第1発光素子、前記第2発光素子および前記第3発光素子は、前記各行方向に所定の順序で配置されていることを特徴とする発光装置。 - 少なくとも1つの前記行は、前記発光素子の順方向電圧の平均値が他の行と異なることを特徴とする請求項6に記載の発光装置。
- 前記第1発光素子、前記第2発光素子および前記第3発光素子は、前記列方向に連続して配置されていることを特徴とする請求項6または請求項7に記載の発光装置。
- 前記第1発光素子、前記第2発光素子および前記第3発光素子は、前記列方向に所定の順序で配置されていることを特徴とする請求項6または請求項7に記載の発光装置。
- 前記各行方向に所定の順序で配置される前記第1発光素子の数と前記第2発光素子の数と前記第3発光素子の数は、同数であることを特徴とする請求項6または請求項7に記載の発光装置。
- 前記複数の発光素子が配置された基板と、
前記基板上に形成され、前記複数の発光素子に電圧を印加する正極および負極と、
前記複数の発光素子の周囲を囲うように前記基板上に形成された光反射樹脂と、
を備えることを特徴とする請求項1または請求項6に記載の発光装置。 - 同一系統の色を発光し、複数の行方向および列方向に配置される複数の発光素子と、
前記複数の発光素子が配置された基板と、
前記基板上に形成され、前記複数の発光素子と電気的に接続された正極の配線部および負極の配線部と、
前記正極の配線部および前記負極の配線部を介して前記複数の発光素子に電圧を印加する正極および負極と、
を備え、
前記複数の発光素子は、同数個ずつ直列接続されるとともに、各直列接続の端部となる発光素子が列方向に配置されて前記正極の配線部および前記負極の配線部とそれぞれ電気的に接続されることで並列接続されており、
前記複数の発光素子は、第1発光素子と、前記第1発光素子よりも小さい出力を有する第2発光素子と、からなり、
前記第1発光素子および前記第2発光素子は、前記各行方向に交互に配置されていることを特徴とする発光装置。 - 前記第1発光素子および前記第2発光素子は、前記列方向に連続して配置されていることを特徴とする請求項12に記載の発光装置。
- 前記第1発光素子および前記第2発光素子は、前記列方向に交互に配置されていることを特徴とする請求項12に記載の発光装置。
- 前記各行方向に交互に配置される前記第1発光素子の数と前記第2発光素子の数は、同数であることを特徴とする請求項12から請求項14のいずれか一項に記載の発光装置。
- 同一系統の色を発光する複数の発光素子が複数の行方向および列方向に配置され、かつ、前記行方向に配置された前記複数の発光素子が当該行方向に直列接続され、前記複数の発光素子が直列接続された各行が並列接続された発光装置の製造方法であって、
同一系統の色を発光する複数の発光素子を、第1群と、前記第1群よりも小さい出力を有する第2群と、に分類する発光素子分類工程と、
正極および負極が形成された基板上に、前記第1群から選択された第1発光素子と、前記第2群から選択された第2発光素子と、を複数の前記行方向および前記列方向に、かつ、前記第1発光素子と前記第2発光素子とが前記各行方向に交互に位置するように配置し、前記行方向に配置された発光素子を直列接続し、前記各行を並列接続し、前記発光素子と前記正極および前記負極とを電気的に接続する発光素子配置工程と、
を含むことを特徴とする発光装置の製造方法。 - 前記発光素子配置工程は、
前記第1発光素子を前記列方向に複数配置する第1段階と、
前記第1段階によって配置された前記複数の第1発光素子と隣り合う位置に、前記第2発光素子を前記列方向に複数配置する第2段階と、
を含むことを特徴とする請求項16に記載の発光装置の製造方法。
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