JP2020088051A - Light-emitting device - Google Patents

Abstract

To provide a light-emitting device in which color mixing of red, green and blue is improved.SOLUTION: In a light-emitting device, multiple component aggregation units are placed on a substrate. In the component aggregation unit 12, a first light-emitting element 16R emitting red light, a second light-emitting element 16G emitting green light and a third light-emitting element 16B emitting blue light are placed in contact on a metal substrate 13, and encapsulated with encapsulation resin. Since the light-emitting elements of respective colors are placed in contact, a component aggregation unit 12 excellent in color mixing can be formed. Consequently, a light-emitting device excellent in color mixing can be provided by placing multiple component aggregation units 12 on the substrate.SELECTED DRAWING: Figure 1

Description

The present invention relates to a light emitting device used for a light source, illumination, a light projector, illumination, etc., and more particularly, to a device excellent in color mixing of emission colors.

Conventionally, in a light emitting device equipped with a large number of light emitting elements that respectively emit red light, green light, and blue light, as shown in FIG. 6, the surface of the substrate 1 is provided with light emitting regions 2 for each of red, green, and blue emission colors. It is configured by dividing 3 and 4 into a plurality of light emitting elements arranged in the respective light emitting areas, and collectively covering the plurality of light emitting elements with a sealing resin mixed with a phosphor for each light emitting area (for example, , Patent Documents 1 and 2).

JP, 2016-31951, A JP, 2018-46113, A

However, in the above-described conventional light emitting device, since the light emitting regions 2, 3 and 4 that emit light are separated from each other, there is a problem that the color mixing property is not good. Further, as shown in FIG. 6, since the sealing resin is applied to the respective light emitting regions 2, 3, 4, the light emitting regions 2, 3, 4 are separated by the dam material 5 serving as a bank. The material 5 became a dark part, and each light emitting region was divided more clearly, which prevented color mixing.

The problem to be solved by the present invention is to provide a light emitting device which solves the above-mentioned problems of the prior art and enhances the color mixing property of red, green and blue emission colors.

The light emitting device of the present invention includes a metal substrate, a first light emitting element that emits red light and a second light emitting element that emits green light, and a blue light that are closely arranged in the center of the metal substrate and are bonded. A plurality of element assembly units each including a third light emitting element and a sealing resin that seals the first to third light emitting elements are arranged on a substrate.

Further, the first light emitting element in this light emitting device is an element in which a phosphor resin mixed with a phosphor for converting into red light is provided on a blue light emitting element or an ultraviolet light emitting element, and the second light emitting element is provided. The light emitting element of is a device in which a phosphor resin mixed with a phosphor for converting into green light is provided on a blue light emitting device or an ultraviolet light emitting device, and the third light emitting device is a blue light emitting device or It is composed of an element in which a phosphor resin mixed with a phosphor for converting into blue light is provided on the ultraviolet light emitting element.

Further, the second light emitting element in this light emitting device may be an element in which two or more blue light emitting elements or ultraviolet light emitting elements are connected.

In addition, the first to third light emitting elements in this light emitting device are closely arranged in two or more rows and columns, a dam material surrounding the first to third light emitting elements is provided, and the sealing resin is provided inside thereof. May be provided.

Further, the metal substrate in this light emitting device has a rectangular shape, and the distance between the opposite sides of one side is set to be substantially equal to the length of one side of the dam member, and the distance between the opposite sides is set longer than the distance between the one opposite sides. An electrode may be provided near the other opposite side.

In the light emitting device of the present invention, the first light emitting element that emits red light, the second light emitting element that emits green light, and the third light emitting element that emits blue light are closely arranged and sealed on the metal substrate. A plurality of element assembly units sealed with a stop resin are arranged on a substrate. In this way, by arranging the light emitting elements of the respective colors in close proximity to each other, it is possible to form an element assembly unit having a good color mixing property. Therefore, by disposing a plurality of the element assembly units on the substrate, it is possible to provide a light emitting device having excellent color mixing.

FIG. 3 is a plan view showing an element assembly unit of the light emitting device according to the embodiment of the present invention. FIG. 2 is a cross-sectional view of main parts of the element assembly unit shown in FIG. 1. FIG. 2 is an enlarged cross-sectional view of a main part around the light emitting element shown in FIG. 1. FIG. 4 is an enlarged cross-sectional view of an essential part around a light emitting element when the specifications of the metal substrate shown in FIG. 3 are changed. It is a top view which shows the light-emitting device which has arrange|positioned many element assembly units shown in FIG. 1 on the board|substrate. It is a top view which shows the conventional light-emitting device.

As shown in FIG. 5, the light emitting device 10 according to the present embodiment includes a substrate 11 and a plurality of element assembly units 12 mounted on the substrate 11.

As shown in FIGS. 1 and 2, the element assembly unit 12 includes a metal substrate 13 made of aluminum or the like having an elongated rectangular shape. Anode-side electrodes 14R, 14G and 14B and cathode-side electrodes 15R, 15G and 15B are provided at both ends in the longitudinal direction on the surface of the metal substrate 13. Further, from the anode side electrodes 14R, 14G, 14B, element connecting patterns 14r, 14g, 14b are drawn out toward the center of the metal substrate 13, respectively, and from the cathode side electrodes 15R, 15G, 15B, respectively. Patterns 15r, 15g, 15b for element connection are drawn out toward the center of the metal substrate 13.

In the center of the metal substrate 13, a first light emitting element 16R for emitting red light, a second light emitting element 16G for emitting green light, and a third light emitting element 16B for emitting blue light are arranged in proximity. ing. As shown in FIG. 3, the first light emitting element 16R in the present embodiment includes an element in which a phosphor resin 18 mixed with a phosphor that converts red light is provided on the blue light emitting element 17. The second light emitting element 16G is composed of a blue light emitting element 17 on which a phosphor resin 19 mixed with a phosphor for converting into green light is provided. Further, the third light emitting element 16B includes a blue light emitting element 17. It is also possible to use an ultraviolet light emitting element in place of the blue light emitting element 17, and in that case, as the third light emitting element 16B, a fluorescent substance in which a phosphor for converting into blue light is mixed on the ultraviolet light emitting element. It is desirable to provide a body resin.

Further, the second light emitting element 16G in the present embodiment may be configured by an element in which two or more light emitting elements are connected, as shown in FIG. 1, in consideration of the weak emission intensity of green light.

Further, the first to third light emitting elements 16R, 16G, 16B are closely arranged in the center of the metal substrate 13 in two or more rows and columns as shown in FIG. 1, and as shown in FIGS. It is mounted on the metal substrate 13 by the white die bonding paste 20.

As shown in FIGS. 1 and 2, the first to third light emitting elements 16R, 16G, and 16B thus mounted on the metal substrate 13 are rectangles provided on the metal substrate 13 close to them. It is surrounded by a frame-shaped dam material 21 and is sealed with a sealing resin 22 filled inside the dam material 21. The sealing resin 22 may be mixed with a filler that diffuses light.

As shown in FIG. 1, the metal substrate 13 described above has electrodes 14R, 14G, 14B, 15R, 15G and 15B in which the distance between the opposite sides 13a and 13b on one side is substantially equal to the length of one side of the dam member 21. Therefore, the interval between the other opposite sides 13c and 13d is set to be longer than the interval between the opposite sides 13a and 13b.

As shown in FIG. 5, when a large number of the element assembly unit 12 having the above-described configuration is mounted on the substrate 11 from the back surface of the substrate 11, the first to third light emitting elements 16R, 16G, 16B have already been arranged close to each other. Since it is in a state of having good color mixing property, it is possible to maintain good color mixing property regardless of how the element assembly unit 12 is arranged.

Further, since the element grouping unit 12 has a good color mixing property, as shown in FIG. 5, a pattern 23 for connection is provided between regions where the element grouping units 12 are densely arranged, or the element grouping unit is densely packed. Even if the dam material 24 is provided in the periphery to seal 12 together and protect the connecting wires and the like, they do not affect the color mixing property.

In addition, since the distance between the opposite sides 13a and 13b of the metal substrate 13 is approximately equal to the length of one side of the dam member 21, the metal substrate 13 is arranged so that the opposite sides 13a and 13b of the metal substrates 13 in the adjacent element assembly units 12 are close to each other. For example, the light emitting elements can be arranged close to each other, and a large number of light emitting elements can be densely integrated.

Further, as shown in FIG. 4, when a surface treatment layer 25 such as vapor deposition of silver for improving light reflection is provided on the surface of the metal substrate 13 such as aluminum, the surface treatment layer 25 is protected. Therefore, it is preferable to cover the surfaces of the metal substrate 13 together with the first to third light emitting elements 16R, 16G, 16B with the top coat 26 made of transparent resin.

1 Substrate 2, 3, 4 Light Emitting Area 5 Dam Material 10 Light Emitting Device 11 Substrate 12 Element Assembly Unit 13 Metal Substrate 14R, 14G, 14B Anode Side Electrode 14r, 14g, 14b Pattern 15R, 15G, 15B Cathode Side Electrode 15r, 14g, 14b Pattern 16R First light emitting element 16G Second light emitting element 16B Third light emitting element 17 Blue light emitting element 18 Phosphor resin 19 Phosphor resin 20 Die bonding paste 21 Dam material 22 Sealing resin 23 Pattern 24 Dam material 25 surface treatment layer 26 top coat

Claims (5)

A metal substrate,
A first light emitting element for emitting red light, a second light emitting element for emitting green light, and a third light emitting element for emitting blue light, which are closely arranged in the center of the metal substrate and are bonded;
A sealing resin for sealing the first to third light emitting elements,
A light-emitting device comprising a plurality of element assembly units each including a plurality of elements arranged on a substrate. The first light emitting element is an element provided with a phosphor resin mixed with a phosphor for converting into red light on a blue light emitting element or an ultraviolet light emitting element,
The second light emitting element is an element in which a phosphor resin mixed with a phosphor for converting to green light is provided on a blue light emitting element or an ultraviolet light emitting element,
The light emitting device according to claim 1, wherein the third light emitting element comprises a blue light emitting element or an ultraviolet light emitting element and an element provided with a phosphor resin mixed with a phosphor for converting into blue light. The light emitting device according to claim 1, wherein the second light emitting element is an element in which two or more blue light emitting elements or ultraviolet light emitting elements are connected. The first to third light emitting elements are arranged close to each other in two or more vertical and horizontal rows, a dam material surrounding the first to third light emitting elements is provided, and the sealing resin is provided inside thereof. Item 3. The light emitting device according to item 1 or 2. The metal substrate has a rectangular shape, and the distance between the opposite sides of one side is substantially equal to the length of one side of the dam member, and the distance between the opposite sides of the other is set longer than the distance between the one opposite sides. The light emitting device according to claim 4, wherein an electrode is provided near the electrode.

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